Circular No. 42/2015/TT-BCT dated December 01, 2015 on electrical measurement in electricity system

• Official number: 42/2015/TT-BCT
• Legislation Type: Circular
• Organization: The Ministry Of Industry And Trade
• Signer: Hoang Quoc Vuong
• Issued Date: 01/12/2015

MINISTRY OF INDUSTRY AND TRADE --------	THE SOCIALIST REPUBLIC OF VIETNAM Independence - Freedom - Happiness ---------------
No. 42/2015/TT-BCT	Hanoi, December 01, 2015

CIRCULAR

ELECTRICAL MEASUREMENT IN ELECTRICITY SYSTEM

Pursuant to the Decree No. 95/2012/ND-CP dated November 12, 2012, on defining the functions, tasks, powers and organizational structure of the Ministry of Industry and Trade.

Pursuant to the Law on Electricity dated December 03, 2004 and Law on amending some articles of the Law on Electricity dated November 20, 2012;

Pursuant to the Government’s Decree No.137/2013/ND-CP dated October 21, 2013 on detailing the implementation of some articles of the Law on Electricity and Law on amending some articles of the Law on Electricity;

At the request of the General Director of Electricity Regulatory Authority,

The Minister of Industry and Trade hereby promulgates a Circular on electrical measurement in electricity system.

Chapter I

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Article 1. Scope

This Circular provides for electrical measurement in generation, transmission, distribution, retail and wholesale of electricity, to be specific:

1. Requirements for measurement system, measurement data collection system and measurement data management system

2. Responsibilities of entities involved in electrical measurement.

3. Procedures for agreement on technical design, investment, installation and acceptance of measurement system and measurement data collection system.

4. Management and operation of measurement system, measurement data collection system and measurement data management system.

5. Collecting, handling and storage of data in service of electricity delivery.

6. General provisions on electricity delivery.

Article 2. Regulated entities

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1. Electricity-generating entities.

2. Electricity system and market operator (National Load Dispatch Center).

3. Electricity wholesalers.

4. Transmission network operators.

5. Electricity distributors.

6. Electricity retailers.

7. Entities providing services in connection with electrical measurement, including:

a) Testing and inspecting entities;

b) Measurement data management entities;

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9. EVN.

Article 3. Definitions

For the purposes of this Circular, the terms below shall be construed as follows:

1. Voltage level is one of nominal voltage values of a system, including:

a) Low voltage which is a nominal voltage of 01 kV;

b) Medium voltage which is a nominal voltage level of between over 01 kV and 35 kV;

c) High voltage which is a nominal voltage level of between over 35 kV and 220 kV;

d) Ultra-high voltage which is a nominal voltage level of over 220 kV;

2. Current transformer (hereinafter referred to as "CT") is a device that transforms the electrical current, expanding the range of voltage measurement for the measurement system.

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4. Voltage switch is a switchgear, logic circuit or relay used to select voltage.

5. Measurement database is a database that measurement data and information about management and operation of the measurement system.

6. Electric meter (hereinafter referred to as “meter ”) is a device that measures electric energy, integrates power over time, store and display the measured values.

7. Connection point is the point connecting the equipment, electrical grid and electrical plant to the electrical grid id.

8. Electricity wholesaler is an electricity entity issued with an operation license in electricity wholesale. Depending on each level of competitive electricity market, the electricity wholesaler is one of the following entities:

a) Electric Power Trading Company is the only electricity wholesaler in the competitive generation market;

b) Other electricity wholesalers that are established according to each level of competitive electricity market.

9. Measurement system investor is an organization and individual investing and installing measurement system and measurement data collection system.

10. Relevant entity is an entity coordinating with other entities in the process of agreement on design, investment, installation, manage and operation of measurement system, measurement data collection system, including:

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b) Transmission network operators;

c) Electricity-wholesale entities;

d) Electricity distributors;

dd) Electricity retailers;.

e) Measurement data management entities;

g) Electricity users.

11. Generating entity is an entity that owns one or several electrical plants connected to the national electricity system and is issued with an operation license in electricity generation.

12. Electricity distributor is an electricity entity issued with an operation license in electricity distribution and wholesale, including:

a) Power Corporations;

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13. Electricity retailer is an electricity entity issued with an operation license in electricity distribution, retailing, and wholesale from an electricity wholesaler or electricity distributor in order for electricity users to get an electricity retail offer.

14. Electrical grid management entity is an entity that owns and operates the transmission grid or distribution grid, including:

a) Transmission network operators;

b) Electricity distributors;

c) Electricity retailers.

15. Measurement data management entity is an entity that invests, installs, manages and operates the measurement data collection system and measurement data management system under its management.

16. Measurement system management and operation entity is an entity that directly manages and operates the measurement system under its management, including:

a) Electricity-generating entities;

b) Transmission network operators;

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d) Electricity retailers;

dd) Electricity users.

17. Measurement system owner is an entity that owns the measurement system and measurement data collection system (if any), including:

a) Electricity-generating entities;

b) Transmission network operators;

c) Electricity distributors;

d) Electricity retailers;

dd) Electricity users.

18. Testing and inspecting entity is an entity that is issued with a license for testing, calibration, and inspection of measuring instruments according to regulations of the law on measurement.

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20. Electricity user is an organization or individual that purchases electricity from national electricity system to use and sell it to other organizations or individuals.

21. Transmission grid user is an organization and individual that has equipment and electrical grid connected to transmission grid to use transmission services, including:

a) Electricity-generating entity that has a power plant connected to the transmission grid;

b) Electricity distributor that is directly provided with electricity from the transmission grid;

c) Electricity retailer that is directly provided with electricity from the transmission grid;

b) Customer using electricity directly provided from the transmission grid.

22. Distribution grid user is an organization and individual who has equipment and electrical grid connected to distribution grid to use distribution services, including:

a) Electricity-generating entity that has an electrical plant connected to the distribution grid.

b) Electricity retailers;

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23. Circuit connector is a device used to connect the measuring circuit.

24. Measurement system is a system that includes the measuring instruments and circuit integrated to measure and determine the amount of power transmitted through a measuring point.

25. Measurement data collection system is a combination of hardware, information transmission and software that are responsible for collecting data from the meter and providing it for the measurement system management and operation entity and measurement data management entity.

26. Measurement data management system is a system consisting of hardware, computers and software that are responsible for connecting and collecting measurement data from measurement data collection system to handle, calculate and store measurement data at the measurement data management entity.

27. Junction box is a box that protects the connections of branches of measuring circuits and measuring instruments with lid to ensure the lead seals.

28. Electrical grid is a system of transmission lines, transformers and synchronous equipment for transmission, including:

a) Transmission grid;

b) Distribution grid.

29. Distribution grid is the grid that includes lines and substations with voltage levels of 110 kV or lower.

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31. Measuring circuit is an electric circuit system linking the measuring instruments for electrical measurement.

32. Large power plant is a plant with a total installed capacity of over 30 MW.

33. Small power plant is a plant with a total installed capacity of 30 MW or less.

34. Measurement data is the power value measured by the meter , calculated electricity or electricity according to the estimation of measured data for delivery and payment.

35. Measuring instruments includes meter , CT, VT and other auxiliary devices for electrical measurement.

36. Measurement information is information about devices, measurement system and measuring points including features, technical parameters and information in connection with management and operations.

37. IEC standard is an electrical technical standard provided by the International Electrotechnical Commission.

38. Measuring point is the physical position on the primary circuit where the traded electricity is measured and determined.

39. LAN (Local Area Network) is a computer network that interconnects computers within a limited area.

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41. RS232/RS485 is the standard for serial communication technology between computers and peripheral devices defined by the Electronic Industries Association (EIA).

42. Ethernet is a technology that transmits the data frames and is standardized as IEEE 802.3 used for LAN.

Chapter III

REQUIREMENTS FOR THE MEASUREMENT SYSTEM

Section 1. GENERAL REQUIREMENTS FOR THE MEASUREMENT SYSTEM

Article 13. Rules for defining measuring points

1. The measuring point defined must be identical or adjacent to the connection point;

2. For the medium voltage level or higher, main measuring points and redundant measuring points must be defined at each connection point. Points and number of redundant measurements shall be precisely defined according to the voltage level and particular characteristics of the measuring point.

3. For the low voltage level, a main measuring must be defined at each connection point.

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Article 14. Measuring points of power plant

1. If the electricity-generating entity possesses a power plant involved in competitive electricity market or a large power plant

a) 01 (one) main measuring point and 02 (two) redundant measuring points must be defined at each connection point;

b) The connection point of the electricity-generating entity

- The main measuring point is defined at the main circuit breaker or terminals of the high voltage of the booster transformer directly connected to electrical grid, unless otherwise agreed.

- The redundant measuring point 01 is defined at the outgoing feeder of the substation at the power plant, unless otherwise agreed.

- The redundant measuring point 02 is defined at the terminal of generator, unless otherwise agreed.

c) The connection point does not belong to the electricity-generating entity

- In case the substation of an electricity-generating entity has only 01 line connected to the electric power system via the connection point and no power bypassing the busbar of the substation of the power plant, the main measuring point is identical or adjacent to the connection point;

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- The redundant measuring point 01 is defined under the agreement between relevant parties;

- The redundant measuring point 02 is defined as prescribed in Point b of this Clause.

d) In case the main measuring point or redundant measuring points are defined at the substation of electrical grid management entity, an agreement between electricity-generating entity, electrical gird management entity, Electric Power Trading Company and relevant entity (if any) must be made.

2. In the event the electricity-generating entity possesses a small power plant not involved in competitive electricity market

a) 01 (one) main measuring point and 01 (one) redundant measuring points must be defined at each connection point;

b) The main measuring point and redundant measuring point are defined as prescribed in Point b, Point c , Point d, Clause 1 of this Clause.

Article 15. Measuring points of electricity users or entities distributing and retailing electricity connected to the medium voltage or higher

1. For connection points with a voltage of over 110 kV, 01 (one) main measuring point and 01 (one) redundant measuring point must be defined at each connection point.

2. For the connection points supplying medium voltage, electricity users or electricity retailers may negotiate with the entity distributing electricity supplied from the redundant measuring points if necessary.

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4. The connection point of the transmission network operator or electricity distributor

a) The main measuring point is defined at the connection point, unless otherwise agreed.

b) The redundant measuring point (if any) is defined under the agreement between relevant parties;

5. The connection point of the substation of electricity users or electricity retailer

a) The main measuring point is defined at the main circuit breaker or terminals of the high voltage of the transformer directly connected to electrical grid, unless otherwise agreed;

b) The redundant measuring point

- For the voltage level of over 110 kV: The redundant measuring point is defined at the outgoing feeder of the substation directly connected to electrical grid, unless otherwise agreed;

- For the medium voltage: The redundant measuring point is defined under the agreement between relevant parties;

6. In case the connection points are different from those specified in Clause 4 and Clause 5 of this Article, the main measuring point is defined under the agreement between the involved parties.

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1. 01 (one) main measuring point and 01 (one) redundant measuring point must be defined at each connection point;

2. The connection point of the Transmission network operator

a) The main measuring point is defined at the main circuit breaker or terminals of the low voltage of the transformer at the substation of transmission network operator, unless otherwise agreed;

b) The redundant measuring point is defined at the outgoing feeder of the substation of transmission network operator, unless otherwise agreed.

3. The connection point of the substation of the electricity distributor

a) The main measuring point is defined at the main circuit breaker or terminals of the high voltage of the transformer connected to transmission grid, unless otherwise agreed.

b) The redundant measuring point is defined at the outgoing feeder of the substation of the electricity distributor, unless otherwise agreed.

Article 17. Measuring points between two Electricity distributors

The main measuring point and redundant measuring point are defined under the agreement between electricity distributor and relevant entity.

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The measuring point for a customer using distribution grid connected to low voltage is defined at the connection point of the customer using distribution grid, unless otherwise agreed.

Article 19. Requirements for the measurement system

1. The main measurement system shall be installed at the main measuring point and must precisely define all measuring quantities of electricity trading, and eliminate elements affecting the measuring result by the loop structure of electricity system, thereby acting as a firm basis for electricity calculation and payment through the connection point.

2. The redundant measurement system shall be installed at the redundant measuring point to perform the following functions:

a) Replace the main measurement system, thereby acting as a basis for calculation of quantities of electricity trading in case the main measurement system operates inaccurately or has faults based on the test results of the testing and inspecting entity and a general record of the relevant parties;

b) Check and monitor the measuring result of the main measurement system under the normal working condition of the main metering system;

c) Combine with the main measurement system and other redundant measurement systems to calculate the electrical production for calculation in some special cases.

3. The measuring instruments must satisfy technical requirements for measurement and have specimen approved, must be tested and inspected as prescribed in the law on measurement.

4. CT shall not be used to install the ring main unit at transformer bushing, circuit breaker for the measurement system in service of electricity trading.

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1. The secondary winding of CT and secondary cable connected to the meter of the main measurement system must not be used for any purpose and must be independent from the redundant measurement system. For CT of the redundant measurement system, the secondary winding may be used for both meter and other measuring and controlling equipment provided that the common secondary circuits must be designed to ensure the safety and smooth operation of the measurement system.

The secondary winding for electricity delivery must not be used for both meter and protective equipment.

2. The secondary cable wired from the secondary winding of CT to the meter of the main measurement system must not be used for any purpose and must be independent from the redundant measurement system.

3. The secondary cable of the measuring circuit must be wired by the shortest way and the number of connection points through circuit connector is the least and must be eligible to be sealed on the circuit connector cabinet or connection point. The secondary cable of the main measurement system must be wired separately and directly wired from the junction box of CT, the intermediate cabinet of VT to the meter box without going through the circuit connector at the intermediate box. The secondary cable of the measuring circuit must be a flexible conductor with two insulated layers.

4. In case the meter is supplied with voltage from one of the VT busbars through the voltage circuit transformer, the wiring terminals of voltage switch must satisfy eligibility requirements for seal and lead seal and the meter must be programmed to record the time and duration of the voltage switching.

5. The load of secondary circuit of CT and VT must not exceed the burden allowable on CT and VT according to the manufacturer's regulations.

6. The measuring secondary circuit that needs connected must ensure seal and lead seal do not affect the protective and control secondary circuit.

7. In case the current circuit of the redundant measuring system is used in conjunction with other measuring devices, the meter must be first connected before measuring equipment, must not affect the accuracy of the measurement system and must be eligible to seal current circuit of the junction box of CT and meter with lead.

8. The trial junction boxes must be installed for the testing of measuring instruments and eligible for seal and lead seal. In case the secondary winding for the measurement system and secondary winding for protection are placed in the same secondary junction box and the entire secondary junction box fails to be sealed, the secondary winding for the measurement system must be sealed to prevent unauthorized intervention.

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Article 21. Requirements for seal and lead seal and security

1. The entire measurement system, including CT and VT junction box, meter , current circuit, voltage circuit, converted logic circuit, and trial junction box (if any) must be sealed or sealed with lead to prevent unauthorized intervention in accordance with law.

2. Electricity distributors, and electricity retailers shall issue regulations on the sealing pliers and lead for sealing junction box (CT, VT, meters) and meter box enclosures, and decisions on the number of sealing pliers, lead for sealing junction box (CT, VT, meters), meter box enclosures in conformity with the number of meters under their management, and shall register quantity and code of lead seal brand in according to regulations.

3. The measurement systems equipped with the measurement data collection system after being read and collected from measuring points must be secured and encrypted to prevent unauthorized intervention.

4. The software managing the system for reading, transmitting and aggregating measurement data must be secured using multiple password levels to ensure security, accuracy, and reliability of the measurement data.

Article 22. Management of meter’s passwords

1. The password of a meter must be divided in to 03 (three) different levels to satisfy requirements for management and operation of meter, and is conventionally regulated as follows:

a) “Setup” password is the password granting the access to meter to install and change its parameters and operational modes. This password is used to install part or whole of meter’s parameters and only those who have responsibility or competence may use it.

b) “Time synchronization” password is the password granting the access to meter to read data and synchronize the time of meter. This password does not allow the setup and change of parameters and operational modes of the meter and only those who have responsibility or competence may use it.

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2. The password level of each meter must be set differently. These passwords must be kept and secured in each sealed envelope corresponding to each meter.

3. The envelopes containing meter’s passwords must be handed over to the responsible person. The password manager shall be responsible for compiling the envelopes containing meter’s password into a set of dossier on meter’s passwords with the following contents: Type of meter, meter’s number, measurement system owner, and measurement system management and operation entity.

4. When handing over the envelope containing meter’s passwords in the process of management, storage or use of passwords, a record bearing the signature of receiving and handing parties is required.

5. In case the meter uses password which is a hard key, it must be sealed to ensure no intervention in the meter unless the seal is broken.

6. The entity possessing a measurement system or entity managing and operating a measurement system shall be responsible for managing and securing the “Only read” password of the meter.

7. The testing and inspecting entity shall be responsible for managing and securing the “Setup” password of the meter.

8. The measurement data management entity shall be responsible for managing and securing the “Time synchronization" password of the meter.

Article 23. Management of dossier on electricity measuring and delivery

In the process of design, investment, management, operation, delivery, and payment, the relevant entities shall be responsible for managing and recording the following dossiers:

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a) Technical design documentation of measurement system agreed between relevant parties according to regulations;

b) A certified true copy of certificate of inspection for CT, VT, and meter of the testing and inspecting entity in case of use of Type-1inspection seal;

c) Record of testing for CT, VT and meters of the testing and inspecting entity;

d) Record of examination and testing of the secondary circuit of the measurement system of the testing and inspecting entity;

dd) Record of setup of meter’s parameters;

e) Record of acceptance of installation of the measurement system, date of inspection and symbol of inspected lead;

g) Record of acceptance of installation of the measurement data collection system;

h) Record of acceptance, inspection, fault repair and change of equipment of the measurement system in the process of management and operation;

i) As-built drawing of measuring secondary circuit and measurement data collection system;

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2. Electricity delivery between electricity purchase party and electricity users

a) Voltage level of over 100 kV: Documents defined in Clause 1 of this Article;

b) Medium voltage: Documents defined in Point a, Point b (if any), Point c, Point d, Point e, Point g (if any) and Point k (if any), Clause 1 of this Article;

c) Low voltage: Documents defined in Point b (if any), Point dd (if any), and Point e, Clause 1 of this Article;

Section 2. REQUIREMENTS FOR THE MEASUREMENT SYSTEM AT MEDIUM VOLTAGE LEVEL OR MORE

Article 24. Configuration of the measurement system

1. The configuration of the measurement system includes:

a) Meter ;

b) CT;

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d) Electric circuit and the secondary cable

dd) Devices for collecting measurement data;

e) Devices for ensuring safety, and protecting locations of seal and lead seal.

g) Auxiliary devices, meter boxes, test connection boxes, connection switching devices, measuring circuit isolator, logic devices for voltage transformer, voltage circuit (or current circuit) supplied to meter , devices for checking voltage and current, lightning arresters used on the telecommunications system of meter .

2. The specific configuration of a measurement system is precisely defined according to the voltage level, scale of power purchase and characteristics of measuring points.

Article 25. Requirements for the meter

1. General requirements

A meter shall:

a) be 3-phase 4-wire or 01-phase 02-wire type;

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c) have one or more tariffs;

d) measure active and reactive power by separate two ways of receiving and sending into 04 quadrants;

dd) measure maximum capacity and record total load chart;

e) have the ability to connect to computers, gather and read data locally and remotely;

g) be powered from the secondary voltage measurement system with required maintenance of operation upon loss of 01 or 02-phase voltage;

h) include an internal power source to power the real time clock. If necessary, the meter can be battery-powered to display data;

i) come with levels of password;

k) be sealed and sealed with lead to ensure impossible access to the wiring terminals and change of parameters set in the meter without breaking the lead seal;

l) have the ability to store the measurement information and load chart at least 60 days with the cycle of recording the measuring value not exceeding 30 minutes for a data channel and shall be programmed to operate an integral cycle of less than 30 minutes;

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n) be connected to a measurement data collection system locally or remotely in conformity with the connection standard and data collection software.

2. Requirements for the accuracy class applicable to measurement of voltage level of over 220 kV or measurement in service of electricity delivery between power plant involved in electricity market or large power plant and electrical grid

a) The main meter must reach the accuracy class 0.2 for active power and 2.0 for reactive power according to the standards defined by the Ministry of Science and Technology.

b) The redundant meter must reach the accuracy class 0.5 for active power and 2.0 for reactive power according to the standards defined by the Ministry of Science and Technology.

3. Requirements for the accuracy class applicable to measurement in service of electricity delivery for the cases that are not set forth in Clause 2 of this Article

a) The main meter must reach the accuracy class 0.5 for active power and 2.0 for reactive power according to the standards defined by the Ministry of Science and Technology.

b) The accuracy class of the redundant measuring meter is defined under the agreement between relevant parties but must not be lower than the accuracy class:

- Upon measurement of voltage level of 110 kV: 0.5 for active power and 2.0 for reactive power according to the standards defined by the Ministry of Science and Technology;

- Upon measurement of medium voltage: 1.0 for active power and 2.0 for reactive power according to the standards defined by the Ministry of Science and Technology.

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Article 26. Requirements for the use of CT for electricity measurement purpose

1. General requirements

A CT shall:

a) come with the secondary winding exclusive to measuring instruments and meter ;

a) be supplied with the secondary current with nominal value of 1A or 5A;

c) seal the lid of junction box of secondary winding connecting the measuring instruments and meter with lead to ensure no impact on the connected circuit without breaking the seal.

2. Requirements for accuracy class applicable to measurement of voltage level of over 220 kV or measurement in service of electricity delivery between power plant involved in electricity market or large power plant and electrical grid

a) The secondary winding of CT used for measurement purpose must reach the accuracy class 0.2 according to the standards defined by the Ministry of Science and Technology;

a) The secondary winding of CT used for redundant measurement purpose must reach the accuracy class 0.5 according to the standards defined by the Ministry of Science and Technology;

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3. Requirements for the accuracy class applicable to measurement in service of electricity delivery for the cases that are not set forth in Clause 2 of this Article

a) The secondary winding of CT used for main measurement purpose must reach the minimum accuracy class 0.5 according to the standards defined by the Ministry of Science and Technology;

b) The secondary winding's accuracy class of CT used for redundant measurement purpose shall be defined under the agreement between relevant parties but must not be lower than the accuracy class 0.5 applicable to measurement of voltage level of 110 kV, and 1.0 applicable to measurement of medium voltage according to the standards defined by the Ministry of Science and Technology.

4. If the Ministry of Science and Technology is yet to define the standards in accuracy class applicable to CT, the IEC standard or other equivalent standards shall be applied.

Article 27. Requirements for the use of VT for electricity measurement purpose

1. General requirements

A VT shall:

a) come with the secondary winding exclusive to measuring instruments and meter;

b) be supplied with secondary voltage with nominal value of 100 V or 110 V;

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2. Requirements for the accuracy class applicable to measurement of voltage level of over 220 kV or measurement in service of electricity delivery between power plant involved in electricity market or large power plant and electrical grid

a) VT used for main measurement purpose must reach the accuracy class 0.2 according to the standards defined by the Ministry of Science and Technology;

b) VT used for redundant measurement purpose must reach the accuracy class 0.5 according to the standards defined by the Ministry of Science and Technology;

c) The burden of secondary winding of CT must not exceed the burden allowable on the secondary circuit load according to the manufacturer's regulations.

3. Requirements for the accuracy class applicable to measurement in service of electricity delivery for the cases that are not set forth in Clause 2 of this Article

a) VT used for measurement purpose must reach the accuracy class 0.5 according to the standards defined by the Ministry of Science and Technology;

b) The VT's accuracy class used for redundant measurement purpose shall be defined under the agreement between relevant parties but must not be lower than the accuracy class 0.5 applicable to measurement of voltage level of 110 kV, and 1.0 applicable to measurement of medium voltage according to the standards defined by the Ministry of Science and Technology.

4. If the Ministry of Science and Technology is yet to define the standards in accuracy class applicable to VT, the IEC standard or other equivalent standards shall be applied.

Chapter IV

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Article 30. Management of measurement data collection system and measurement data management system

1. Responsibilities of the measurement data management entity

a) Invest, install, manage and operate the measurement data collection system and measurement data management system under its management, thereby ensuring other entities' connection as prescribed in this Circular;

b) Provide relevant entities with data file format (hereinafter referred to as “file”), standard connection interface based on the data collection model and method of transmitting measurement data;

c) Set parameters and implement measures for ensuring information security and encryption for the measurement data collection system, measurement data management system at measuring points and its data collection, storage, and handling center to ensure accuracy and reliability of the measurement data.

2. Responsibilities of the measurement system management and operation entity

a) Secure the set parameters for the meter data reading software under its management;

b) Never intervene in the data reading and transmission software to modify set parameters, which affects the accuracy of measurement data. Never modify data transmitted from the meter to computer or the data concentrator unit positioned locally (if any).

Article 31. Overall model of the measurement data collection system and measurement data management system

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2. Measurement data collection models

a) Depending on the actual condition and infrastructure, the measurement data collection model includes one of the following types:

- Model for collecting local data from individual meter;

- Model for collecting data via the concentrator.

b) The cases applying the model for collecting local data from individual meter

- Apply to individual meters that are inconvenient for connecting groups of meters;

- Transmit data from the meter to the server that collects data through WAN/LAN/mobile network;

- Apply to distributed meters.

c) The cases applying the model for collecting data via the concentrator

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- Apply to meters located at the same location.

3. According to the information transmission medium and distance, technology solutions are classified as follows:

a) Information transmission medium

- Wired: PLC, RS485/RS232,Ethernet, fiber optic cable and xDSL;

- Wireless: RF/RF-Mesh and cellular network.

b) Information transmission distance

- Locally: A solution using a personal digital assistant to collect data directly at the measuring point;

- Remotely: A solution using a remote measurement data collection system to collect meter’s data or a remote data concentrator unit (DCU) via a wired or wireless transmission channel.

Article 32. Requirements for the measurement data collection system

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1. Have the ability to collect measurement data via the connection interface transferring data directly to meter at each measuring pint in the event of agreement between relevant parties.

2. Synchronize time with standard time for meters of the system.

3. The measurement data collection system must have the following minimum functions:

a) Collect and transmit measurement data automatically on schedule or read it on demand.

b) Manage the list of measuring points, schedule for data collection applicable to each meter or each group of meters; manage and store measurement data obtained from the meter ;

c) Manage the system access, including username authentication and system authorization access.

4. The transmission medium of usable information is a wired or wireless system, ensuring the compatibility with the measurement data management system. Information transmission medium and method must include solution to security and encryption of information.

5. The information equipment connecting with the meter must satisfy the following requirements:

a) Requirements for information security and encryption to prevent unauthorized intervention and forged information;

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6. The data transmission system, file and connection interface standards of the measurement data collection system must conform to the measurement data management system of the measurement data management entity.

Article 33. Requirements for the measurement data management system

The measurement data management system must fulfil the following minimum functions and requirements:

1. The transmission medium of usable information is wired or wireless systems and must adopt solutions to information security and encryption.

2. The information equipment connecting with the measurement data collection system must satisfy the following requirements:

a) Requirements for information security and encryption to prevent unauthorized intervention and forged information;

b) Requirements for electricity and telecommunications security to prevent damage to the measurement data collection system.

3. The ability to connect and collect measurement data via the computer of the measurement data collection system must be demonstrated. The list of measuring points and relevant information must be declared or managed.

4. A report on management and storage of measurement data and relevant facts must be managed, recorded and prepared.

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6. The servers must have the ability to store the entire process of handling, validating, and exploiting measurement data and be equipped with the redundant system to ensure that the measurement data is not lost in any case.

7. Access management includes code and system authorization access of users. Grant administrator privileges to software at authorization level (installation, configuration, granting of privileges to users for the manipulation and calibration of data) and operation level (reading, viewing and export of data).

8. Data must be connected and shared with other application software to exploit data.

9. Measurement information must be managed.

10. Measurement data must be handled.

11. Measurement data must be examined and validated.

12. The ability to store data within at least 05 years must be demonstrated.

Article 34. Measurement data file

1. The common measurement data file is *.txt or *.csv.

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Chapter V

TECHNICAL DESIGN, INVESTMENT, INSTALLATION AND ACCEPTANCE OF THE MEASUREMENT SYSTEM AND MEASUREMENT DATA COLLECTION SYSTEM

Section 1. AGREEMENT ON TECHNICAL DESIGN OF THE MEASUREMENT SYSTEM AND MEASUREMENT DATA COLLECTION SYSTEM AT OVER 110 KV VOLTAGE LEVEL, DELIVERY BETWEEN ELECTRICITY DISTRIBUTORS AND DELIVERY BETWEEN POWER PLANT AND ELECTRICAL GRID

Article 35. Rules for making an agreement on technical design

1. For new electrical works

a) The agreement on technical design of the measurement system and measurement data collection system in service of electricity delivery and trade shall be made during the technical design period of the investment project after reaching an agreement on connection of electrical works to electrical grid.

b) The contents in connection with technical design of the measurement system and measurement data collection system must be agreed before the technical design and total cost estimate for construction of electrical works are approved.

2. For operated electrical works

a) An agreement on technical design of the measurement system and measurement data collection system shall be made upon the appearance of new measuring points or upgradation and improvement of the current measurement system;

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3. Rules for making an agreement on technical design of the measurement system and measurement data collection system

a) The measurement system investment entity shall be responsible for making an application for an agreement on technical design of the measurement system and measurement data collection system;

b) Electric Power Trading Company, electricity distributor and electricity retailer shall be responsible for taking charge of the agreement on technical design of the measurement system and measurement data collection system in service of electricity delivery under their management;

c) Other relevant entities shall be responsible for coordinating with each other and giving opinions upon the receipt of request for agreement on technical design of the measurement system and measurement data collection system.

4. In the event the electricity distributor invests in the measurement system and measurement data collection system to sell electricity to customers using electrical distribution grid (unless the customer using electrical distribution grid is an electricity-generating entity) or in the event the electricity retailer invests in the measurement system and measurement data collection system to sell electricity to electricity users, the electricity distribution entity or electricity retailer shall be responsible for designing and agreeing with customers about relevant contents of the technical design of the measurement system and measurement data collection system before their investment and installation as prescribed in this Circular.

Article 36. Application for an agreement on technical design of the measurement system and measurement data collection system

1. A written request for an agreement on technical design.

2. A copy of the written approval or agreement on connection of electrical works to electrical grid.

3. The technical design documentation of the measurement system and measurement data collection system includes:

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b) Documents relating to the measurement system include:

- Main measuring points and redundant measuring points;

- Installation locations and specifications of measuring instruments (types, voltage, current and voltage ratio, accuracy class, burden and other specifications);

- Solutions to connection and lead seal of the secondary circuit of the measurement system;

- Installation locations of meter box

c) Documents relating to the measuring data collection system include:

- Connection solutions of the measurement data collection system;

- Specifications of equipment of the measurement data collection system.

d) List and weight of main equipment of the measurement system that needs investment.

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a) A wiring diagram of the connection of electrical works to national electricity system depicting all specifications;

b) A schematic diagram of measurement and protection of electrical works;

c) A schematic diagram of the measurement system of electrical works;

d) A layout diagram of electrical equipment of the measurement system of electrical works;

dd) A wiring diagram of the measuring secondary circuit depicting the solution to lead seal;

e) A wiring diagram of the measurement data collection system;

g) A diagram of the meter box and intermediate box used for electrical measurement (if any).

5. A draft of the agreement on technical design of the measurement system and measurement data collection system must be prepared according to the form defined in the Appendix 2 enclosed with this Circular.

Article 37. Making of an agreement on technical design of the measurement system and measurement data collection system

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a) The measurement system investment entity shall be responsible for making and submitting an application for an agreement on technical design of the measurement system and measurement data collection system to the Electric Power Trading Company in the following cases:

- Measure the boundary between the large power plant and transmission grid or distribution grid;

- Measure the boundary between the power plant using renewable energy sources and electrical grid;

- Measure the boundary between the large power plant and transmission grid or distribution grid.

- Measure the boundary of electric power trading with foreign countries via the voltage level of over 110 kV;

- Measure the boundary between transmission grid and customers using electricity connected to transmission grid.

b) The measurement system investment entity shall be responsible for making and submitting an application for an agreement on technical design of the measurement system and measurement data collection system to the electricity distributor in the following cases:

- Measure the boundary between the small power plant and distribution grid;

- Measure the boundary between distribution grid and electricity retailer or customer using electricity connected to distribution grid in case the electricity retailer or electricity user invests in the measurement system.

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Measure the boundary between the two Power Corporations: The measurement system investment entity shall be responsible for making and submitting an application for an agreement on technical design of the measurement system and measurement data collection system to the Electric Power Trading Company. The remaining entity shall be responsible for coordinating with the Electric Power Trading Company in the process of agreement;

- Measure the boundary between the two Provincial Electricity Companies affiliated to a Power Corporation: The measurement system investment entity shall be responsible for making and submitting an application for an agreement on technical design of the measurement system and measurement data collection system to the Power Corporation. The remaining entity shall be responsible for coordinating with each other in the process of agreement;

d) Other cases defined in Points a, b and c of this Clause shall comply with regulations defined in Clause 3, Article 35 of this Circular.

2. Procedures for making an agreement on technical design of the measurement system and measurement data collection system

a) After making an application as prescribed in Article 36 of this Circular, the measurement system investment entity shall be responsible for submitting 03 (three) sets of application for an agreement on technical design of the measurement system and measurement data collection system to the Electric Power Trading Company or electricity distributor as prescribed in Clause 1 of this Article to make an agreement;

b) The Electric Power Trading Company or electricity distributor shall be responsible for submitting requests to the directly relevant entities for suggestions on the proposal for the agreement on the design;

c) Upon receipt of suggestions from the directly relevant entities, the Electric Power Trading Company or electricity distributor shall be responsible for: - consolidating suggestions from the relevant entities and assessing contents of application: electricity measuring points and technical design of the measurement system and measurement data collection system.

- delivering suggestions in writing to the measurement system investment entity to complete the draft for an agreement on design.

d) According to suggestions from the Electric Power Trading Company or electricity distributor, the measurement system investment entity shall be responsible for reaching an agreement and completing the draft for an agreement on technical design of the measurement system and measurement data collection system distributor as prescribed in this Circular;

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3. Time for making and signing an agreement on technical design of the measurement system and measurement data collection system applicable to the issues defined in this Article shall comply with regulations set forth in Article 38 of this Circular.

Section 2. INVESTMENT, INSTALLATION OF THE MEASUREMENT SYSTEM AND MEASUREMENT DATA COLLECTION SYSTEM AT OVER 110 KV VOLTAGE LEVEL, DELIVERY BETWEEN ELECTRICITY DISTRIBUTORS AND DELIVERY BETWEEN POWER PLANT AND ELECTRICAL GRID

Article 39. Requirements for investment and installation

1. Ensure the measurement system and measurement data collection system shall comply with regulations defined in this Circular and conform to the agreed technical design of the measurement system and measurement data collection system.

2. Ensure the measuring instruments shall comply with the law on measurement.

The measuring instruments used must comply with the approval for sample measuring instruments granted by a competent regulatory authority in charge of measurement. For special case, the measuring instrument in ring main unit or the ring main unit is invested but not approved the sample and additional external measuring instruments fail to be installed, relevant entities shall be responsible for guiding the measurement system investment entity to adopt procedures for approving sample as prescribed in the law on measurement.

Article 40. Responsibilities of entities in investment and installation of the measurement system and measurement data collection system

1. The measurement system investment entity

a) Invest and install the measurement system and measurement data collection system in conformity with the technical design of the measurement system and measurement data collection system agreed as prescribed in Section 1 of this Chapter;

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- Initially test and inspect the measuring instruments as prescribed in this Circular and the law on measurement;

- Test the measuring secondary circuit in compliance with technical requirements for measurement and in conformity with technical design of the measurement system;

- Seal the measurement system with lead to ensure no intervention in measuring circuit and measuring instruments unless the lead seal is broken;

- Program and set meter’s parameters and level of meter’s password.

c) Provide the measurement data management entity and relevant electricity delivery entity with information about measuring points (measuring points, delivery methods and specifications);

d) Coordinate with the measurement data management entity in installing and examining the measurement data collection system locally and remotely.

2. The electrical grid management entity shall be responsible for coordinating with the measurement system investment entity and relevant entities in the initial process of installing, testing and inspecting the measurement system and measurement data collection system in the event the measurement system is located at the substation of electrical grid management system.

3. The measurement data management entity

a) Deliver code of measuring points and address of meters to the newly installed measurement system under its management;

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c) Coordinate with the measurement system investment entity in installing and inspecting the measurement data collection system at measuring points and lines transmitting measurement data from the electrical work to the measurement data management system under its management;

d) Install software encrypting measurement data after reading and transmitting it to the local computer, prevent unauthorized intervention and forged information in measurement data before data is transmitted to the measurement data management system under its management.

4. The testing and inspecting entity

Perform the following duties under the agreement signed with the measurement system investment entity:

a) Initially test and inspect the measuring instruments as prescribed in this Circular and the law on measurement;

b) Test the measuring secondary circuit in compliance with techniques and in conformity with technical design of the measurement system;

c) Seal the measurement system with lead to ensure no intervention in the measuring circuits and instruments;

d) Set the parameters and password levels for the meter within its competence;

dd) Provide the measurement system investment entity with records of testing and inspection of the measurement system, records of installation of the meters as prescribed in this Circular and the law on measurement.

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Article 41. Participants involved in the acceptance

Depending on each delivery measurement, the participants involved in acceptance include the following entities:

1. The measurement system investment entity.

2. Electric Power Trading Company or Electricity distributor.

3. The measurement system management and operation entity.

4. The measurement data management entity.

5. The testing and inspecting entity.

6. Relevant entity.

Article 42. Dossier serving the acceptance

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a) A certificate of testing and inspection of CT, VT and meters of the testing and inspecting entity;

b) A decision on approval for types of meters, CT, VT (if any);

c) A record of testing of CT, VT, and meters of the testing and inspecting entity;

d) A record of testing and inspection of the secondary circuit of the measurement system of the testing and inspecting entity;

dd) A record of setup of meter’s parameters;

2. A record of acceptance of installation of the measurement system;

3. A record of acceptance of installation of the measurement data collection system;

Article 43. Procedures for acceptance

1. After the installation of the measurement system and measurement data collection system is completed, within at least 14 days before the expected day of acceptance, the measurement system investment entity shall be responsible for submitting a written request for acceptance enclosed 01(one) set of dossier serving acceptance as prescribed in Article 42 of this Circular to the Electric Power Trading Company or Electricity distributor and relevant electricity delivery entities.

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a) If the dossier is valid as prescribed and is eligible for acceptance, the Electric Power Trading Company or Electricity distributor shall be responsible submitting a written request to the entities involved in acceptance for an agreement on the acceptance plan.

b) If the dossier fail to be eligible for acceptance, the Electric Power Trading Company or Electricity distributor shall be responsible submitting a written request for the measurement system investment entity to modify and inform the entities involved in acceptance thereof.

3. After reaching an agreement on acceptance plan, the measurement system investment entity shall take charge of accepting the measurement system and measurement data collection system with in the presence of representatives of the relevant entities prescribed in Article 41 of this Circular.

4. The measurement system investment entity shall be responsible for consolidating all dossiers on acceptance and submitting 01 (one) copy of set of dossier to each entity involved in acceptance.

5. The entities involved in acceptance shall be responsible for retaining dossiers on acceptance and updating information about measuring points on the list of delivery measuring points and their management program.

6. The measurement system shall only be put into operation when the entities involved in acceptance reach an agreement on acceptance results and sign a record of acceptance.

Article 44. Main content of acceptance process

1. The two-step acceptance process is went through as follows:

a) Inspect the installation of instruments before they are energized

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- Physically inspect the installation of the measurement system: inspect the installation locations of primary instruments, inspect installation of secondary circuits, inspect the measuring instruments’ parameters, and inspect installation of meters.

- Compare results of physical inspection of installation of the measurement system and agreed technical design of the measurement system, technical documentation of the measuring instruments and records of installation of the meters;

- Inspect the consistency of the set parameters of meters and parameters of the installed meters.

- Inspect parameters and installation of the measurement data collection system and compare them with agreed technical design of the measurement system.

- The testing and inspecting entity shall set the meters’ password levels, keep the “Setup” password of the meter, hand the “Read only” password over to the measurement system investment entity or measurement system owner and hand the “Time synchronization” password over to the measurement data management entity.

- Finalize meter’s indicators, record meter’s programmed parameters, number of installation times and the last time of programming of the meter;

- Seal the CT and VT junction box, measuring secondary circuit, intermediate connections and testing box with lead to ensure no intervention in the measurement system unless the lead seal is broken; this requires the presence of parties involved in acceptance.

b) Inspect the operation of the measurement system after its loads are energized

- Inspect the value of current, voltage, and quadrant between current and voltage;

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- Inspect the operation of the measurement data collection system;

- After the completion of inspection items, the parties shall affirm that the measurement system operates normally and seals the remaining parts of measurement system with lead;

- After the acceptance process is completed, parties involved in acceptance shall sign a record of acceptance according to the form defined in the Appendix 3 enclosed with this Circular.

2. During the inspection of operation of the measurement system when carrying load, if finding faults that cause the system to operate inaccurately, entities shall coordinate with each other in repairing and determining the electricity production that must be collected arrears or refunded.

3. If the measurement system or measurement data collection system fails to be completely accepted after the works are energized, the parties shall be responsible for making the first record of acceptance that shows problems and request for handling, remedial measures for problems and time for remediation to form a basis for the next acceptance. The electricity delivered when the measurement system has not been accepted yet shall be collected arrears or refunded (if any) when the measurement system has been accepted.

Chapter VI

MANAGEMENT, OPERATION, REPAIR OF FAULTS OF THE MEASUREMENT SYSTEM, MEASUREMENT DATA COLLECTION SYSTEM AND MEASUSING DATA MANAGEMENT SYSTEM

Section 1. MANAGEMENT AND OPERATION OF THE MEASUREMENT SYSTEM, MEASUREMENT DATA COLLECTION SYSTEM AND MEASUSING DATA MANAGEMENT SYSTEM

Article 48. Management and operation of the measurement system

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2. During management and operation, the measurement system management and operation entity shall be responsible for regularly monitoring and inspecting the operation of measurement systems and promptly detecting problems leading to faults. In case of detection of problems or faults, the measurement system management and operation entity must inform relevant parties thereof to repair together, the repair must be carried out as prescribed in Section 2 of this Chapter.

3. The change of instruments or upgradation and improvement of measurement system shall only be made when relevant entities reach an agreement on this. For the measurement system used to sell electricity to customers using electricity connected to the medium voltage level or lower, before changing or upgrading and improving the measurement system, the measurement system management and operation entity shall be responsible for informing electricity users thereof.

4. The measurement system management and operation entity or measurement system owner shall be responsible for managing the measurement system's seals and lead seals as prescribed in this Circular and the law on measurement.

5. The inspection seal and lead seals of the measuring instruments shall only be broken when testing, inspection and fault repair are carried out by the testing and inspecting entity in the presence of representatives of relevant entities.

6. The clock of meter and measurement data collection system is based on Vietnam time zone and is synchronized with the time taken from the Global Positioning System (GPS) or from national standard time in conformity with the actual conditions of the measurement data management entity.

7. For the measurement system used to sell electricity to electricity users, in case of detection of any problems or faults, electricity users must inform the electricity seller thereof.

Article 49. Change of the measurement system’s parameters

1. The case that the electrical measurement is carried out for the delivery of electricity between power plant and electrical grid or between transmission grid and distribution grid or between electricity distributors or between customers using electricity connected to the voltage level of over 110 kV and electrical grid

a) Within at least 05 working days before the expected day on which the measurement system’s parameters are changed, the measurement system management and operation entity shall be responsible for issuing a written notice (enclosed with documents relating to the necessity for the change of measurement system’s parameters) to the Electric Power Trading Company or Electricity distributor and relevant entities.

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c) The measurement system management and operation entity shall be responsible for taking charge of changing the measurement system's parameters according to the agreed plan; the measurement system’s parameters must be changed as prescribed in the law on measurement;

d) The Electric Power Trading Company or electricity distributor and relevant entities shall be responsible for changing the measurement system's parameters according to the agreed plan;

dd) The entities must update the change of measurement system’s parameters on the measurement database under their management. Measurement data management entity shall be responsible for updating it on the measurement data collection system and measurement data management system after receipt of the written notice from the measurement system management and operation entity.

2. For electrical measurement carried out for the delivery of electricity to customers using electricity connected to the medium voltage level or lower, the electricity distributor or electricity retailer shall be responsible for changing the measurement system’s parameters and issuing a written notice to electricity users in advance, stating reasons thereof.

Article 50. Change of the measurement system’s instruments

1. For electrical measurement carried out for the delivery of electricity between power plant and electrical grid or transmission grid and distribution grid or between the electricity distributors or between customers using electricity connected to the voltage level of over 110 kV and electrical grid, if it is necessary to change instruments or upgrade an improve the measurement system, the measurement system management and operation entity shall be responsible for taking charge of performing the following duties:

a) Except emergency prescribed in Clause 3, Article 53 of this Circular, when changing the measurement system’s faulty instrument whose technical parameter is equivalent to the old instrument’s parameter or adheres to the agreement with relevant entities, the procedures for the change are adopted as follows: - Within at least 05 working days before the expected day on which the measurement system’s instrument is changed, the measurement system management and operation entity shall be responsible for issuing a written notice (enclosed with relevant documents) to the Electric Power Trading Company or Electricity distributor and relevant entities about a plan on the change and a plan on acceptance of the measurement system.

- Within at least 02 working days since receipt of the written notice from the measurement system management and operation entity, the Electric Power Trading Company or Electricity distributor and relevant entities shall be responsible for reaching an agreement on the plan on the change and plan on the acceptance of the measurement system.

- The measurement system operation and management entity shall take charge of changing and accepting the measurement system according to the agreed plan.

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- Make an agreement on technical design, investment, installation and acceptance of the changed instruments as prescribed in Chapter V of this Circular;

- The measurement data management entity and relevant entities shall be responsible for updating the change of measurement system’s parameters on the measurement database, measurement data collection system and measurement data management system.

2. For electrical measurement carried out for the delivery of electricity to customers using electricity connected to the medium voltage level or lower, the electricity distributor or electricity retailer shall be responsible for changing the measurement system’s instrument as prescribed in Article 47 of this Circular and issuing a written notice to customers in advance, stating reasons thereof. When changing the measurement system’s instrument, presence and confirmation of the representative of electricity user are required.

Article 51. On-site duties

When changing the measurement system’s instrument, the participants shall be responsible for performing the following duties:

1. Inspect seal and operation of the measurement system;

2. Finalize meter indicators and calculate production in the cycles without using the measurement system.

3. Calculate arrears and refund (if any).

4. Make a record of change of parameters and instruments or removal of measuring points, including the following contents: electrical measurement points, time, meter indicator before and after installation and dismantling, and duty performance. The record must bear the signatures of the representatives of participants;

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1. The measurement system operation and management entity shall be responsible for managing and operating the measurement data collection system at measuring points, including information equipment, computers (if any), meter data reading program to ensure data from meters at measuring points is fully and accurately updated under its management and then transmit it to the measurement data collection system and measurement data management system of the measurement data management entity in order to update it on the common database.

2. The measurement data management entity shall be responsible for managing, operating and securing the measurement data collection system, measurement data management system and database of electrical measurement under its management to ensure information and data are accurately and reliably.

Section 3. INSPECTION OF MEASURING INSTRUMENTS

Article 56. General regulations on inspection of measuring instruments

1. The inspection of measuring instruments includes initial inspection, periodic inspection, post-repair inspection and inspection upon request.

2. The measuring instruments shall only be put into operation after passing inspection as prescribed in the law on measurement and satisfying all requirements set forth in this Circular.

3. The initial inspection is the first inspection of measuring instruments to be carried out before they are put into operation. Under its management, the measurement system investment entity must bear all expenses for the initial inspection of measuring instruments.

4. The periodic inspection is carried out in a cycle defined by a competent regulatory authority on measurement. The measurement system owner must bear all expenses for the periodic inspection of measuring instruments.

5. The post-repair inspection is carried out as prescribed in the law on measurement.

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a) Inspection is carried out at the request of the measurement system owner;

b) Inspection is carried out at the request of the relevant entity that does not own or invest in the measurement system, except the case set forth in Point c of this Clause;

c) In case the electricity user requests inspection of the existing measuring instrument used to sell electricity to customer, the electricity distributor or electricity retailer and electricity user shall be responsible for coordinating with each other in carrying out inspection as prescribed in Clause 3, Clause 4, Article 25 of the Law on Electricity and Article 19 of the Government’s Decree No. 137/2013/ND-CP dated October 21, 2013 detailing implementation of a number of articles of the Law on Electricity and the law on amending a number of articles of the Law on Electricity.

7. The measurement system investment entity or the measurement system owner shall be responsible for consolidating all dossiers on inspection (Certificate of inspection and Record of inspection) and submitting 01 (one) set of dossier to the measurement data management entity and each entity involved in inspection of measuring instruments.

8. The measurement data management entity and entities involved in inspection of measuring instruments shall be responsible for retaining dossiers on inspection and updating information about measuring points on the list of delivery measuring points and their management program.

Article 57. Participants involved in inspection of the measuring instruments at medium voltage level or more

Depending on each delivery measurement and purposes of inspection, the participants involved in inspection of measuring instruments may include the following entities:

1. The measurement system owner or measurement system investment entity.

2. The Electric Power Trading Company or Electricity distributor.

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4. The testing and inspecting entity.

5. Relevant entity.

Article 58. Periodic inspection of the measuring instruments at medium voltage level or more

1. Before December 05 every year, the measurement system management and operation entity shall coordinate with the measurement system owner in submitting a written notice to relevant entities and testing and inspecting entity about the periodic inspection plan of measuring instruments prepared for each month of the next year.

2. Before December 20 every year, according to the periodic inspection plan submitted by the measurement system management and operation entity, relevant entities and testing and inspecting entity shall be responsible for reaching an agreement on the periodic inspection plan of the next year.

3. In case the periodic inspection plan changes, before the 20^th of the final month of every quarter, the measurement system management and operation entity shall coordinate with the measurement system owner in updating and reaching an agreement on the plan with relevant entities and testing and inspecting entity, inspecting the periodic inspection plan prepared for the remaining months of the year.

4. According to the periodic inspection plan of the next year and quarterly update plan agreed upon by parties, within at least 10 days before the day on which the periodic inspection is carried out, the measurement system management and operation entity shall be responsible for announcing the date of periodic inspection to the entities set forth in Article 57 of this Circular.

5. The measurement system management and operation entity shall be responsible for taking charge and coordinating with the measurement system owner in carrying out periodic inspection of measuring instruments; the testing and inspection shall carry out an inspection as prescribed in the law on measurement and under the agreement signed with the measurement system management and operation or measurement system owner.

6. In case the result of periodic inspection shows that the measuring instrument fails to satisfy the requirements set forth in this Circular and technical requirements set forth in the law on measurement, the measurement system owner must change the measuring instrument as soon as possible.

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1. For the inspection at the request of the measurement system owner

a) Within at least 10 days before the expected day on which the inspection upon request is carried out, the measurement system owner shall be responsible for issuing a written notice to the relevant entity. Within at least 03 days since receipt of the written request, relevant entities shall be responsible for giving their opinions to the measurement system owner about the inspection plan;

b) The inspection upon request shall only be carried out after the plan is agreed by relevant entities;

c) The measurement system owner must bear all expenses for the inspection upon request.

2. For the inspection at the request of the relevant entity that does not own or invest in the measurement system, except the case set forth in Point c, Clause 6, Article 56 of this Circular

a) Within at least 10 days before the expected day on which the inspection is carried out, the relevant entity making a request for inspection shall be responsible for issuing a written notice to the measurement system owner and other electricity delivery entities. Within at least 03 days since receipt of written notice, the measurement system owner and other relevant entities shall be responsible for giving their opinions to the relevant entity making a request for inspection;

b) The inspection upon request shall only be carried out after the plan is agreed by relevant entities;

c) Expenses for inspection of measuring instruments

- In case the measuring instrument satisfies the requirements set forth in this Circular and technical requirements set forth in the law on measurement after carrying out the inspection upon request, the entity making a request for inspection must bear all expenses for the inspection;

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3. The measurement system owner shall be responsible for carrying out the inspection upon request of the measuring instrument. The testing and inspecting entity shall carry out an inspection as prescribed in the law on measurement and under the agreement signed with the measurement system owner.

4. In case the result of inspection upon request shows that the measuring instrument fails to satisfy the requirements set forth in this Circular and technical requirements set forth in the law on measurement, the measurement system owner must change the measuring instrument as soon as possible.

Article 60. Post-repair inspection of the measuring instruments at medium voltage level or more

1. The measuring instrument after being repaired must be inspected to ensure that all requirements set forth in this Circular and technical requirements set forth in the law on measurement are met.

2. The measurement system owner or the measurement system management and operation shall be responsible for carrying out post-repair inspection of measuring instrument as prescribed in the law on measurement.

3. Procedures and issues concerning post-repair inspection shall comply with the law on measurement.

Article 61. Inspection of the measuring instruments at medium voltage level or more

1. The case that electrical measurement is carried out for the delivery of electricity between power plant and electrical grid or between transmission grid and distribution grid or between electricity distributors or between customers using electricity connected to the voltage level of over 110 kV and electrical grid, procedures for carrying out inspection of measuring instruments shall be adopted as follows:

a) The entities involved in inspection of lead seals and operational state of the measuring instruments before carrying out inspection;

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c) The testing and inspecting entity shall retrieve meter database, connect inspection outlines and carry out an inspection of measuring instruments in accordance with the procedures for inspecting meter established by the regulatory authority on measurement;

d) The testing and inspecting entity shall reset the measuring instrument, connect information between meter and measurement data collection system, and seal the measurement system with lead.

dd) The testing and inspecting entity and entities involved in inspection shall be responsible for calculating the increased electricity production and electricity production without obtaining measurement (if any) during inspection;

e) Make a record of inspection that bears the signatures of the representatives of participants;

2. For electrical measurement carried out for the delivery of electricity to customers using electricity connected to the medium voltage level, the electricity distributor or electricity retailer shall carry out an inspection of measuring instruments according to the following procedures:

a) Coordinate with electricity user in inspecting lead seals and operational state of the measurement system, finalize meter indicators and break lead seals before carrying out an inspection or periodic change.

b) Carry out a post-repair inspection or periodic change as prescribed in the law on measurement;

c) Reset the measurement system for customers and seal the measurement system with lead;

d) Make a record of inspection that bears the signatures of the representatives of participants.