CIRCULAR

AMENDMENTS TO SOME ARTICLES OF THE CIRCULAR NO. 28/2014/TT-BCT DATED SEPTEMBER 15, 2014 OF THE MINISTER OF INDUSTRY AND TRADE PRESCRIBING PROCEDURES FOR HANDLING FAULTS IN NATIONAL POWER SYSTEM, CIRCULAR NO. 40/2014/TT-BCT DATED NOVEMBER 05, 2014 OF THE MINISTER OF INDUSTRY AND TRADE PRESCRIBING PROCEDURES FOR DISPATCHING OF NATIONAL POWER SYSTEM AND CIRCULAR NO. 44/2014/TT-BCT DATED NOVEMBER 28, 2014 OF THE MINISTER OF INDUSTRY AND TRADE PRESCRIBING SWITCHING PROCEDURES IN THE NATIONAL POWER SYSTEM

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

Pursuant to the Government’s Decree No. 98/2017/ND-CP dated August 18, 2017 defining the functions, tasks, powers and organizational structure of the Ministry of Industry and Trade;

Pursuant to the Government’s Decree No. 137/2013/ND-CP dated October 21, 2013 elaborating some Articles of the Law on Electricity and Law on Amendments to some Articles of the Law on Electricity;

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

The Minister of Industry and Trade hereby promulgates a Circular on amendments to some Articles of the Circular No. 28/2014/TT-BCT dated September 15, 2014 of the Minister of Industry and Trade prescribing procedures for handling faults in national power system, Circular No. 40/2014/TT-BCT dated November 05, 2014 of the Minister of Industry and Trade prescribing procedures for dispatching of national power system and Circular No. 44/2014/TT-BCT dated November 28, 2014 of the Minister of Industry and Trade prescribing switching procedures in the national power system.

Article 1. Amendments to some Articles of the Circular No. 28/2014/TT-BCT dated September 15, 2014 of the Minister of Industry and Trade prescribing procedures for handling faults in national power system

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 “6a. “important electricity consumers” means consumers that are given electricity supply priority over others when the electricity seller disconnects or reduce electricity supply and that are determined by the People’s Committee of a province or central-affiliated city depending on the political, social, security and national defence significance.

6b. “residential area” means a geographical area where households live together or for which the planning has been approved so as for households to move in to live. The geographical areas without any households living despite people and vehicles travelling through, fields or planted hills are not treated as residential areas.

6a. “crowded places” include markets, squares, hospitals, schools, exhibition and fair venues, shopping malls, entertainment venues, wharves, stations, railway stations and other public places.”.

2. Points a and d clause 8 of Article 3 are amended as follows:

“a) Dispatchers at dispatch levels;

d) Mobile switching personnel.”

3. Clause 9 of Article 3 is amended as follows:

“9. “fault” means an event or one or more pieces of equipment in the electricity power causing a disruption of electricity supply or affecting safe, stable and continuous supply of power to the national power system.”.

4. Clause 2 of Article 6 is amended as follows:

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5. Clause 2 of Article 8 is amended as follows:

“2. Automatic and protective relays (including low frequency and low voltage load-shedding relays) must be regularly in operation, except for the relays which have to be separated from operation according to the operation principles and working mode of the energy system, and selectivity”.

6. Point dd is added to clause 5 of Article 10 as follows:

“dd) Apart from the regimes for fault reporting specified in points a, b, c and d clause 5 of this Article, the dispatch level vested with controlling rights shall implement such regimes for fault reporting in the national power system as follows:

- For a long-lasting fault in the electricity transmission system of at least 220 kV that causes damage to equipment or a fault in the national power system that causes a widespread outage in a province or a central-affiliated city or a fault that results in load shedding with a capacity of at least 200 MW, report the fault to the Electricity Regulatory Authority via message or email after the element having the fault in the national power system is isolated;

- Within 36 hours from the fault occurrence, send a fault report to the Electricity Regulatory Authority by email using the form in Appendix 3 to this Circular;

- Before the 20^th of every month, the national load dispatch unit shall submit a consolidated report on analysis of faults using the form in Appendix 4 to this Circular (with respect to the faults that have to be analyzed and assessed) and previously occurred faults to the Electricity Regulatory Authority by post or email, regarding the following faults:

+ Long-lasting faults on 500 kV electrical grid;

+ Long-lasting faults on 220 kV and 110 kV electrical grids and power plants, which cause a widespread outage in a province or central-affiliated city or an urban district of Hanoi and Ho Chi Minh City or cause load shedding with a capacity of at least 200 MW or directly affect the operation of the power plants involved in the competitive electricity market.”.

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“3. In the course of handling a fault, the dispatch level vested with controlling rights is permitted to operate the power system with the frequency and voltage other than the those required upon operation of the power system in the normal operation mode according to the Regulation on electricity transmission system or Regulation on electricity transmission system promulgated by the Ministry of Industry and Trade but shall promptly take measures to return the power system to normal operation to ensure its stability.”.

8. Clause 1 of Article 22 is amended as follows:

“1. If a fault occurs on lines exceeding 35 kV but not exceeding 220 kV, it is permitted to close the lines no more than 02 (two) times, including the unsuccessful automatic reclosing. For the lines that run over a crowded place or residential area, it is only permitted to close the lines for the second time after the operating unit has conducted a check and confirmed that such lines are qualified for operation and ensure the safety of people and electrical equipment. The operating unit shall provide the list of lines running over crowded places and residential areas to the dispatch level vested with controlling rights.”.

9. Article 38 is amended as follows:

“Article 38. Restoration of transformer after fault

1. In case a transformer is switched off for a protection action other than differential protection, gas protection, oil flow- or oil pressure-related protection, after the operating personnel conducts a check and reports the transformer’s physical appearance and does not detect any unusual signs, the dispatcher shall put the transformer back into operation if one of the following conditions:

a) The dispatcher confirms that the protection circuit trips inadvertently;

b) The operating personnel finds that the protection circuit trips inadvertently because it is damaged and the damage has been rectified. If the damage to the protection circuit fails to be rectified, the dispatcher shall permit the isolation of such protection circuit at the request of the operating unit and put the transformer back into operation provided that the remaining protection relays are capable of providing adequate protection against all types of faults and the prescribed fault clearing time is observed.

2. In case a transformer is switched off for differential and gas (or oil flow or oil pressure-related) protection, the dispatcher shall put the transformer back into operation if the following conditions are met:

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b) A written confirmation by the operating unit that the transformer is qualified for operation shall be provided for the dispatch level vested with controlling rights.

3. In case a transformer is switched off for differential protection or gas protection or oil flow or oil pressure-related protection, the dispatcher shall isolate the transformer and transfer it to the operating unit for testing and checking of the primary protection circuit that has tripped. The dispatcher shall put the transformer back into operation if one of the following conditions is met:

a) During the testing, it is found that the transformer’s primary protection circuit trips due to damage to the protection circuit and such damage has been rectified;

b) During the testing, it is found that the transformer’s primary protection circuit trips due to damage to a device in the primary protection zone (but it is not the transformer) and such damage has been rectified;

c) No damage is found during the testing of the primary protection circuit and devices in the primary protection zone and the operating unit has met the conditions set out in clause 2 of this Article.

4. In case a transformer is shut down resulting in disconnection of electricity supply to important electricity consumers, the dispatcher shall put the transformer back into operation if the following conditions are met:

a) The dispatcher conducts a check, confirms and informs that such transformer is only switched off for one of its internal protection actions and no external signs showing that the transformer is damaged are found;

b) The operating personnel informs that the transformer is put back into operation with the consent of the leader of the operating unit.”.

10. Article 45 is amended as follows:

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In the event of an electrical substation-wide power outage, the operating personnel at the substation or control center or operating personnel sent by the operating unit to the unmanned substation shall follow the procedures below:

1. Handle the fault following the Procedures for operation and fault handling promulgated by the operating unit, and switch to the backup power source for supply of self-consumed power to the substation.

2. Switch off all circuit breakers in the substation. In special cases where all circuit breakers cannot be switched off due to technical requirements, specific regulations of the operating unit should be in place.

3. Check equipment in the substation.

4. Immediately report status of circuit breakers to the dispatch level vested with controlling rights.

5. Check the substation in its entirety to decide whether to isolate the substation or put it back into operation according to the following conditions:

a) If the fault does not occur in the substation and the equipment qualified for operation is available receiving power again, request the dispatch level vested with controlling rights to resume the electricity supply;

b) If the fault occurs in the substation, request the dispatch level vested with controlling rights to isolate the lines and equipment having the fault.”.

11. Article 46 is amended as follows:

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In the event of a power plant-wide power outage, the operating personnel at the power plant or control center or operating personnel sent by the operating unit to the unmanned power plant shall follow the procedures below:

1. Handle the fault following the Procedures for operation and fault handling promulgated by the operating unit, and switch to the backup power source for supply of self-consumed power to the power plant.

2. Switch off all circuit breakers in the electrical substation of the power plant. In special cases where all circuit breakers cannot be switched off due to technical requirements, specific regulations of the operating unit should be in place.

3. Check equipment in the power plant and generating sets.

4. Immediately report status of circuit breakers and generating sets to the dispatch level vested with controlling rights.

5. Ensure that the equipment and generating sets that do not have faults are available receiving power again.

6. Request the dispatch level vested with controlling rights to isolate the lines and equipment having the fault (if any).

7. Request the dispatch level vested with controlling rights to cooperate in quickly restoring the power plant’s self-consumption system (if there is a fault with the backup power source).”.

12. Clause 1a is added after clause 1 of Article 47 as follows:

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13. Article 48 is amended as follows:

“Article 48. Warning mode

The power system operates in the warning mode in case of occurrence or existence of one of the following conditions:

1. The conditions for operation of the electricity transmission system in the warning mode under the Regulation on electricity transmission system promulgated by the Ministry of Industry and Trade are met.

2. Lines and transformers of 110 kV has a current carrying capacity of at least 90%, but not exceeding the rated value.”.

14. Article 49 is amended as follows:

“Article 49. Actions of dispatchers taken when the power system is in warning mode

1. Control capacity of power plants so that the secondary frequency regulation reserve reaches or exceeds the specified level.

2. Control the capacity of power plants so that the load carrying capacity of lines and transformers with voltages of at least110 kV does not exceed 90% of the rated value.

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4. Reduce the electric power output level on lines in the areas prone to natural disasters or unusual weather conditions that may affect security of power supply or issues concerning national defense and security that may threaten power system security.

5. Provide information in order to publish warning information on the website of the power system and electricity market after necessary measures have been taken but the system fails to be returned to normal operation.”.

15. Article 50 is amended as follows:

“Article 50. Emergency mode

The power system operates in the emergency mode in case of occurrence or existence of one of the following conditions:

1. The conditions for operation of the electricity transmission system in the emergency mode under the Regulation on electricity transmission system promulgated by the Ministry of Industry and Trade are met.

2. Voltage at any node on the 110 kV electrical grid exceeds the permissible voltage range in the case of a single fault.

3. The load carrying capacity of any electrical equipment on the 110 kV electrical grid or equipment connected to the 110 kV electrical grid is beyond the rated value but less than 110% of the rated value and when such equipment is overloaded, the extreme emergency mode may be triggered.”.

16. Title and point a clause 2 of Article 51 are amended as follows:

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“a) Control the capacity of power plants so that lines or electrical equipment is not overloaded;”.

17. Article 52 is amended as follows:

“Article 52. Extreme emergency mode

The power system operates in the extreme emergency mode in case of occurrence or existence of one of the following conditions:

1. The conditions for operation of the electricity transmission system in the extreme emergency mode under the Regulation on electricity transmission system promulgated by the Ministry of Industry and Trade are met;

2. The load carrying capacity of any electrical equipment on the 110 kV electrical grid or equipment connected to the 110 kV electrical grid is at least 110% of the rated value and when such equipment is overloaded, the disintegration of individual components of the power system may occur.”.

18. Title, clause 1 and point a clause 2 of Article 53 are amended as follows:

“Article 53. Actions of dispatchers taken when the power system is in extreme emergency mode

1. Control the frequency as prescribed in the Procedures for dispatching of national power system promulgated by the Ministry of Industry and Trade in order to maintain the frequency within the permissible range in normal operation mode.

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a) Control the capacity of power plants so that lines do not exceed the power transmission limit or the load of the electrical equipment is not more than 110% of the rated load;”.

Article 2. Amendments to some Articles of the Circular No. 40/2014/TT-BCT dated November 05, 2014 of the Minister of Industry and Trade prescribing procedures for dispatching of national power system

1. Point d clause 39 of Article 3 is amended as follows:

“d) Mobile switching personnel.”

2. Clause 2 of Article 10 is amended as follows:

“2. In emergency case without delay (fire or threat to human life or equipment safety) in a power plant or electrical substation, the operating personnel in the power plant, electrical substation or control center shall switch equipment as per the relevant procedures and take responsibility for their fault handling operations. After the fault is completely handled, the operating personnel in the power plant, electrical substation or control center shall immediately notify the superior operating personnel having the rights to control the equipment having the fault.'.

3. Clause 2 of Article 11 is amended as follows:

“2. Voltage on 500 kV electrical grid, 220 kV busbars of 500 kV electrical substations ”,

4. Clauses 2 and 3 of Article 14 are amended as follows:

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3. 66 kV, 110 kV and 220 kV electrical grids in the regional power system (including 110 kV and 220 kV equipment and incoming/outgoing feeders on the remaining sides of 110 kV and 220 kV transformers), except for the 110 kV electrical grid the control of which is assigned or authorized to the provincial distribution dispatch level.”.

5. Clause 3 of Article 17 is amended as follows:

“3. 110 kV lines the control of which is authorized by a regional dispatch level, 110 kV transformers (including switchgears on the 110kV side) except for 110 kV transformers at the power plants under the control of the superior dispatch levels, medium-voltage electrical grids in provinces and central-affiliated cities, except for the case specified in clause 1 Article 20 of this Circular.”

6. Point b clause 1 of Article 26 is amended as follows:

“b) Control voltage on 500 kV electrical grid, 220 kV busbars of 500 kV electrical substations;”,

7. Point d is added to clause 2 of Article 52 as follows:

“d) Mobile switching personnel (in case of switching the equipment under their control).”.

8. Point d is added to clause 2 of Article 53 as follows:

“d) Mobile switching personnel (in case of switching the equipment under their control).”.

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“d) Mobile switching personnel (in case of switching the equipment under their control).”.

10. Point b clause 2 of Article 55 is amended as follows:

“b) Switching personnel and Mobile switching personnel at electric utilities of rural and urban districts; electricity distributors and retailers.”.

11. Article 60 is amended as follows:

“Article 60. Conditions for permitting unmanned electrical substations or unmanned power plants

1. In case of establishment of an electrical substation or power plant control center, the operating unit shall set up and submit to the supervisory unit for approval of a project on establishment of unmanned electrical substation/power plant control center after obtaining official written opinions of the dispatch level vested with controlling rights, dispatch level vested with inspection rights and relevant units. Regarding control centers of large power plant, renewable energy (including solar energy, wind, biomass and small hydropower) power plants or transmission power stations, the operating unit shall notify the Electricity Regulatory Authority for its official written opinions before approving the project. The establishment of an electrical substation or power plant control center shall satisfy the following requirements:

a) Electrical substations and power plants that are operated remotely from the control center must belong to the same dispatch unit vested with controlling rights or two dispatch units vested with controlling rights provided that one dispatch unit is directly inferior to another dispatch unit;

b) Infrastructure satisfy all requirements for connection and operation as prescribed;

c) There must be an adequate number of operating personnel trained in accordance with regulations, and instruments supporting the operation of the control center, unmanned power plants and electrical substations.  The number of operating personnel and mobile switching personnel during a shift must be adequate to handle switching operations in any case during the shift. If the control center has more than one type of power plant technology, the operating personnel must meet the requirements of all types of power plant technology or assign personnel to do shifts for different types of technology;

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2. Throughout the operation of the control center, the operating unit may add one or more power plants or electrical substations to remotely control or carry out switching operations from the control center.

The addition of power plants or electrical substations shall be made in such a way that the control center is established as prescribed in clause 1 of this Article.

3. In the case where the control center is not established and the power plants or electrical substations are controlled directly from the dispatch level vested with controlling rights, the operating unit shall agree with the dispatch level vested with controlling rights about:

a) Official date of operation of the unmanned power plants or unmanned electrical substations;

b) Operating unit’s mobile switching personnel who will carry out switching operations by switching order of the dispatch level vested with controlling rights in case they are not able to remotely carry out switching operations at the unmanned power plants or unmanned electrical substations.

4. Unmanned power plants or unmanned electrical substations shall comply with regulations on electrical safety, occupational safety and hygiene, fire safety and intrusion prevention, and other relevant regulations of law.

5. Power plants or electrical substations are entitled to supervise, control and collect status signal, measurement and protection signals from a control center (if any) and or dispatch level vested with controlling rights.

6. The Supervisory Control and Data Acquisition (SCADA) system located at control centers of power plants or electrical substations and SCADA system located at the dispatch level vested with controlling rights must meet technical requirements under the Regulation on electricity transmission system and Regulation on electricity distribution system promulgated by the Ministry of Industry and Trade.

7. Prior to official operation of unmanned power plants or unmanned electrical substations, the operating unit shall formulate and promulgate procedures for operation and handling faults in equipment, procedures for switching electrical equipment at the unmanned power plants or unmanned electrical substations; train and instruct operating personnel in switching and handling faults in the unmanned power plants or unmanned electrical substations in accordance with applicable regulations and its internal procedures.

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12. Article 61 is amended as follows:

“Article 61. Operation of unmanned power plants or unmanned electrical substations

1. The operation of unmanned power plants or unmanned electrical substations shall be carried out from the control center or dispatch level vested with controlling rights. Where necessary, the operating unit may assign mobile switching personnel to do shifts at unmanned power plants or unmanned electrical substations to inspect and supervise the remote control and switching from the control center.

2. If the remote control and switching fail to be carried out, the operating unit shall assign mobile switching personnel to do shifts at the power plants or electrical substations and directly carry out switching operations by switching order of the dispatch level vested with controlling rights. Where necessary, the operating unit shall re-schedule shifts at unmanned electrical substations or unmanned power plants to ensure safe operation and quickly handle emergency cases or faults.”.

3. On each operating shift at the control center, the operating unit shall assign at least 02 (two) employees to do the shift, including 01 (one) who holds the “shift chief” position. The operating unit shall elaborate on the assignment of tasks to operating personnel doing shifts at the control center.

4. The operating unit shall define functions and tasks of mobile switching personnel at unmanned power plants or unmanned electrical substations, shift position, shift handover procedure, time for travel from the shift position to the power plants or electrical substations, means of communication and transport.

5. The operating unit shall assign operating personnel to unmanned power plants or unmanned electrical substations to check equipment on the spot, especially in case of peak capacity transmission or generation.

6. If a fault occurs at the unmanned power plants or unmanned electrical substations, the operating unit shall assign operating and repair personnel to correct the fault as soon as possible.”.

13. Article 64 is amended as follows:

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Frequency control in the national power system means the control process in the power system aimed at maintaining its stable operation, including primary frequency control, secondary frequency control and tertiary frequency control:

1. Primary frequency control is the process of instantaneous adjustment of the frequency of the power system performed by a large number of generating sets equipped with a speed control system,

2. Secondary frequency control is the process of adjustment following the primary frequency adjustment performed through the actions of the AGC system to bring the frequency back to the permissible range.

3. Tertiary frequency control is the process of adjustment following the secondary frequency adjustment performed by the dispatch order to maintain stability of the power system frequency in accordance with prevailing regulations and to facilitate economic scheduling of generating sets’ generating capacity.”.

14. Article 65 is amended as follows:

“Article 65. Regulations on frequency control

1. The national load dispatch unit shall continuously monitor the frequency control reserve capacity and trends in loads of the power system in order to adjust the generating capacity of power plants and maintain the frequency control reserve capacity as prescribed.

2. In order to maintain the secondary frequency control reserve capacity as prescribed, the national load dispatch unit shall appoint one or more power plants to participate in secondary frequency control. According to the assigned tasks in secondary frequency control, the power plants shall put automatic frequency and capacity adjusters into service accordingly. When the reserve capacity for secondary frequency control is almost exhausted, the power plants responsible for secondary frequency control must promptly notify the dispatch level vested with controlling rights.

3. When the frequency of the power system exceeds 50±0.5 Hz, all power plants that do not participate in the adjustment of the primary and secondary frequency must participate in the adjustment depending on the generating sets’ capacity to maintain the frequency at 50±0.5 Hz. When the system frequency has been maintained within the aforementioned range, all power plants participating in the adjustment will keep their capacity unchanged and request the dispatch level vested with controlling rights to confirm the actual generating capacity.”.

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“1. Adjust active generating capacity of power plants:

a) Generating sets providing secondary frequency control ancillary services;

b) Generating sets based on the order of mobilization according to the quotations of the generating sets (if any) in the competitive electricity market or the electricity selling prices;

c) Generating sets providing quick start backup services.”.

16. Clause 3 of Article 132 is amended as follows:

“3. Training period required for a shift chief:

a) For large power plants or power plant control centers (except for power plants using renewable energy): at least 18 months;

b) For small power plants (except for power plants using renewable energy): at least 12 months;

c) For power plants or control centers of power plants power plants using renewable energy:

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- With a capacity of more than 30 MW: at least 09 months.”.

Article 3. Amendments to some Articles of the Circular No. 44/2014/TT-BCT dated November 28, 2014 of the Minister of Industry and Trade prescribing switching procedures in the national power system

1. Point dd is added to clause 6 of Article 3 as follows:

“dd) Mobile switching personnel.”.

2. Point dd clause 8 of Article 3 is amended as follows:

“dd) Mobile switching personnel.”.

3. Point dd clause 9 of Article 3 is amended as follows:

“dd) Mobile switching personnel.”.

4. Point d clause 10 of Article 3 is amended as follows:

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5. Clause 3 of Article 4 is amended as follows:

“3. Operating personnel is not required to prepare switching orders but must fully enter switching steps in the operation logbook before conducting switching operations in the following cases:

a) Fault handling;

b) A switching operation which consists of no more than 03 (three) steps and is carried out at the control center or remotely;

c) A switching operation which consists of no more than 05 (five) steps and is carried out at dispatch levels vested with controlling rights.”.

6. Clause 1 of Article 6 is amended as follows:

“1. Form of the switching order is provided in the Appendix 2 to this Circular. In case of installing a remote monitoring system that allows remote automatic switching, the dispatch level vested with controlling rights and operating unit may prepare an electronic switching order (in which the signatures of persons making, approving and performing the order are managed by the user account hierarchy system) which contains the information specified in the Appendix 2 to this Circular. The dispatch level vested with controlling rights and operating unit shall promulgate and apply the order after obtaining official written opinions of the Electricity Regulatory Authority.”.

7. Article 13 is amended as follows:

“Article 13. Switching primary electrical equipment

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2. At the location of the primary electrical equipment, the two persons cooperating in carrying out switching operations must know the diagram and location of the electrical equipment on the site, have been trained and passed the examination to hold the “operating personnel” title, and are appointed to carry out switching operations. The person directly carrying out switching operations must satisfy safety standard level 03 (three) or higher and person carrying out supervision must satisfy safety standard level 04 (four) or higher. Procedures for carrying out switching operations according to the switching order:

a) At the switching position, the operating personnel shall check whether name of equipment is consistent with that on the switching order;

b) After confirming the equipment to be switched, the person carrying out supervision shall read the order, the person directly carrying out switching operations shall repeat the order and take each switching step according to the switching order.

3. Upon carrying out such complicated switching operation as power-off or testing of new equipment, it is required to adopt the approved method and reach an agreement with relevant units and corresponding dispatch level vested with controlling rights. The person responsible for the entire process of carrying switching operations and tasks mentioned under the program should be clearly defined.

4. After carrying out switching operations, the operating personnel shall follow procedures for equipment delivery and fully enter the following in the operation logbook:

a) Name of the switching order;

b) Changes to protection and automatic relay diagrams, installation or removal of earthing kits (indicate the place of installation or removal);

c) Changes to the wiring diagram, current or past working teams.

5. Electrical equipment or lines shall be put into operation after the repair only when the operating unit confirms that it has performed the following tasks:

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b) Mobile earthing kits have been removed;

c) Information on the switching order have been fully entered in the operation logbook;

d) Equipment has been transferred orally over the phone having the audio-recording function.”.

8. Clause 6 of Article 18 is amended as follows:

“6. If the remote switching control is lost, the operating unit must immediately appoint operating personnel to do a mobile switching shift at the electrical substation or power plant.”.

9. Article 19 is amended as follows:

“Article 19. Conditions for remote switching

1. The SCADA system located at a dispatch level vested with controlling rights or control center must be periodically tested and checked to make sure that remote switching operations are carried out in an accurate and reliable manner and in compliance with the Regulation on electricity transmission system and Regulation on electricity distribution system promulgated by the Ministry of Industry and Trade.

2. The data and control signal transmission system connected with a dispatch level vested with controlling rights, control center, electrical substation or power plant must operate in an accurate and reliable manner.

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4. The control cabinet has the remote control lock status.

5. The electrical substation or power plant has the control lock status to serve the carrying out of switching operations from a dispatch level vested with controlling rights or control center.

6. The control system at a dispatch level vested with controlling rights or control center must work well.”

Article 2. Annulment of regulations set out in clauses 14 and 15 Article 3 of the Circular No. 40/2014/TT-BCT dated November 05, 2014 of the Minister of Industry and Trade prescribing procedures for dispatching of national power system.

Article 5. Effect

1. This Circular comes into force from January 03, 2020.

2. Difficulties that arise during the implementation of this Circular should be reported to the Electricity Regulatory Authority for consideration and resolution within its power or to the Ministry of Industry and Trade for resolution./.

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Thông tư 31/2019/TT-BCT sửa đổi Thông tư 28/2014/TT-BCT quy định về quy trình xử lý sự cố trong hệ thống điện quốc gia, Thông tư 40/2014/TT-BCT quy định quy trình điều độ hệ thống điện quốc gia và Thông tư 44/2014/TT-BCT quy định quy trình thao tác trong hệ thống điện quốc gia do Bộ trưởng Bộ Công thương ban hành