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Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
50053-94
Code for design of 10KV and below substation
Code for design of 1OkV &under electric substation Construction Standard
1994-03-23 Release
1994-11-01 Implementation
State Bureau of Technical Supervision
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full-text Information System
Joint Release
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Code for design of 1OkV and below substation
Code for design of 1OkV under electric Substation GB50053-94
Editor department: Ministry of Machinery Industry of the People's Republic of ChinaApproval department: Ministry of Construction of the People's Republic of ChinaEffective date: November 1, 1994
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Notice on the release of the national standard
"10KV and below substation design specification"Jianbiao [1994] No. 201
According to the requirements of the State Planning Commission's document [1986] No. 250, the national standard "10kV and below substation design specification" edited by China Electric Power Design Institute of the Ministry of Machinery Industry and revised jointly with relevant units has been reviewed by relevant departments. Now the "10kV and below substation design specification" GB50053-94 is approved as a mandatory national standard, which will be implemented on November 1, 1991.
The original national standard "Design Specification for Industrial and Civil 10kV and Below Substations" GBJ53-83 is abolished at the same time.
This specification is managed by the Ministry of Machinery Industry, and its specific interpretation and other work are the responsibility of the China Electric Power Design Institute of the Ministry of Machinery Industry, and its publication and distribution are organized by the Standard and Quota Research Institute of the Ministry of Construction.
Ministry of Construction of the People's Republic of China
March 23, 1994
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Chapter 1 General
Chapter 2
Site Selection
Chapter 3
Electrical Part
Section 1
General Provisions
Section 2 Main Connection
Section 3
Transformer Selection
Section 4
Power Supply Used
Section 5 Operating Power Supply
Distribution and Transformation Equipment
Chapter 4
Section 1
Section 2
Chapter 5
Type and Layout
Channel and Fence
Parallel Connection Container device
Section 1
General provisions·
Section 2
Electrical wiring and auxiliary devices
Section 3 Clothing
Chapter 6 Requirements for related professions
Section 1
Requirements for buildings...
Section 2
Section 3 Heating and ventilation·
Section 4 Others
Appendix 1 Glossary
Appendix 2 Explanation of terms used in this specification
Additional explanation
Engineering construction standard full text information system
Engineering construction standard full text information system
Chapter 1 General
Article 1.0.1 This specification is formulated to ensure that the design of substations guarantees personal safety, reliable power supply, advanced technology, economic rationality and convenient maintenance, and ensure the design quality. Article 1.0.2 This specification applies to the design of substations for new construction, expansion or reconstruction projects of AC voltage 10kV and below.
Article 1.0.3 The design of substations should correctly handle the relationship between short-term construction and long-term development according to the project characteristics, scale and development plan, combine the near and far, focus on the near term, and appropriately consider the possibility of development.
Article 1.0.4 The design of substations should reasonably determine the design scheme based on factors such as load nature, power consumption capacity, project characteristics, site environment, regional power supply conditions and energy conservation.
Article 1.0.5 The equipment and instruments used in substation design should comply with national or industry product technical standards, and should give priority to the use of technologically advanced, economical and energy-saving complete sets of equipment and standardized products, and obsolete products shall not be used. Article 1.0.6 In addition to the provisions of this specification, the design of 10kV and below substations should also comply with the provisions of the current national relevant design standards and specifications. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 2 Site Selection
Article 2.0.1 The location of the substation shall be determined based on the following requirements after technical and economic comparison:
1. Close to the load center;
2. Convenient for incoming and outgoing lines;
3. Close to the power supply side;
4. Convenient for equipment transportation;
5. It should not be located in a place with severe vibration or high temperature; 6. It should not be located in a dusty place or a place with corrosive gas. When it is impossible to stay away, it should not be located on the leeward side of the prevailing wind direction of the pollution source; 7. It should not be located directly below toilets, bathrooms or other places where water often accumulates, and it should not be adjacent to the above places;
8. It should not be located directly above or below an explosive environment, and it should not be located directly above or below an environment with a fire hazard. When it is adjacent to a building with an explosive or fire hazard, it should comply with the provisions of the current national standard "Design Specifications for Power Installations in Explosive and Fire Hazardous Environments";
9. It should not be located in low-lying areas or places where water may accumulate. Article 2.0.2 The substation in the workshop equipped with flammable oil-immersed power transformers should not be located in buildings with a third or fourth fire resistance rating; when it is located in a building with a second fire resistance rating, the building should take local fire prevention measures. Article 2.0.3 In multi-storey buildings, power distribution stations and substations containing electrical equipment with flammable oil shall be located on the ground floor near the external wall, and shall not be located directly above, directly below, adjacent to, or on both sides of evacuation exits in crowded places. Article 2.0.4 Power distribution stations and substations containing electrical equipment with flammable oil shall not be located in high-rise main buildings. When they must be located due to conditions, they shall be located on the ground floor near the external wall, and shall not be located directly above, directly below, adjacent to, or on both sides of evacuation exits in crowded places, and corresponding fire prevention measures shall be taken in accordance with the relevant provisions of the current national standard "Fire Protection Code for Design of High-rise Civil Buildings". Article 2.0.5 Open-air or semi-open-air substations should not be set up in the following places: 1. Places with corrosive gases; 2. Beside buildings with overhanging eaves that are combustible or flame-retardant and with a fire resistance rating of Class 4; 3. Open-air storage yards with cotton, grain and other flammable and explosive items nearby; 4. Places where combustible dust, combustible fibers, dust or conductive dust are easily deposited and seriously affect the safe operation of transformers.
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Chapter III Electrical Part
Section I General Provisions
Article 3.1.1 The layout of the distribution device and the selection of conductors, electrical appliances, and structures shall comply with the requirements of normal operation, maintenance, short circuit and overvoltage. Article 3.1.2 The phase sequence of each circuit of the distribution device should be consistent, and the hard conductor should be painted with phase color paint or phase color markings. The color should be yellow for L1 phase, green for L2 phase, and red for L3 phase.
Article 3.1.3 In areas with an altitude of more than 1000m, the distribution equipment should select electrical appliances and insulators suitable for the altitude, and the impact and power frequency test voltage of its external insulation should comply with the relevant provisions of the current national standard "High-voltage Electrical Equipment Insulation Test Voltage and Test Method".
When high-voltage electrical appliances are used in areas with an altitude of more than 1000m, the conductor current carrying capacity can be ignored.
Article 3.1.4 The exposed conductive parts of electrical equipment must have a reliable electrical connection with the grounding device. Both ends of the row of distribution devices should be connected to the grounding wire. Section 2 Main ConnectionwwW.bzxz.Net
Article 3.2.1 The high-voltage and low-voltage busbars of distribution stations and substations should adopt single busbar or segmented single busbar connection. When the power supply continuity requirement is very high, the high-voltage busbar can adopt segmented single busbar with bypass busbar or double busbar connection. Article 3.2.2 The incoming switch of the dedicated power line of the distribution station should adopt a circuit breaker or a load switch with a fuse. When there is no requirement for relay protection and automatic devices, and there are few outgoing circuits and no load operation is required, isolating switches or isolating contacts can be used. Section 3.2.Article 3 When power is supplied radially from the main distribution station to the substation, the power supply incoming switch of the substation should adopt an isolating switch or isolating contact. When the substation needs to operate with load or there are requirements for relay protection and automatic devices, a circuit breaker should be used.
Article 3.2.4 The incoming side of the 10kV or 6kV non-dedicated power line of the substation should be equipped with a switchgear with protection. Article 3.2.5 Circuit breakers should be installed at the sections of the 10kV or 6kV busbar. When there is no need for load operation and there are no requirements for relay protection and automatic devices, isolating switches or isolating contacts can be installed.
Article 3.2.6
The connecting line between two distribution stations shall be equipped with a circuit breaker at the distribution station on the power supply side and an isolating switch or load switch on the other side. When the power supply possibilities on both sides are the same, circuit breakers shall be installed on both sides. Article 3.2.7 The outgoing line of the distribution station should be equipped with a circuit breaker. When the relay protection and operation requirements are met, a load switch with a fuse may be installed. Article 3.2.8 When the outgoing line switch that supplies power to frequently operated high-voltage electrical equipment also serves as an operating switch, a circuit breaker with frequent operation performance shall be used. Article 3.2.9 On the outgoing line side of a 10kV or 6kV fixed distribution device, a line isolating switch shall be installed in the overhead outgoing line circuit or the cable outgoing line circuit with possible feedback.
Article 3.2.10 When a fixed distribution device with a 10kV or 6kV fuse load switch is used, an isolating switch shall be installed on the power supply side. Article 3.2.11 The arrester and voltage transformer connected to the busbar should share a set of isolating switches. The arrester circuit on the overhead incoming and outgoing lines of the distribution station and substation may not be equipped with an isolating switch. Article 3.2.12 Special voltage and current transformers for billing should be installed at the power supply line of the distribution station powered by the regional power grid. Article 3.2.13 The installation of the primary side switch of the transformer shall comply with the following provisions: 1. When the power supply is in the trunk type, a switchgear with protection or a drop-out fuse should be installed. 2. When the power supply is in the radial type, an isolating switch or a load switch should be installed. When the transformer engineering construction standard full text information system is in the distribution station, the switch may not be installed. Article 3.2.14 The main switch with a transformer secondary side voltage of 6kV or 3kV may use an isolating switch or an isolating contact. When one of the following situations occurs, a circuit breaker should be used:
1. There are many outgoing line circuits,
2. There is a requirement for parallel operation;
3. There are requirements for relay protection and automatic devices. Article 3.2.15 The main switch with a voltage of 0.4kV on the low-voltage side of the transformer should adopt a low-voltage circuit breaker or isolating switch. When there is a requirement for relay protection or automatic power switching, the low-voltage side main switch and busbar section switch should both use low-voltage circuit breakers. Article 3.2.16 When the low-voltage bus has dual power supplies and the transformer low-voltage side main switch and busbar section switch use low-voltage circuit breakers, knife switches or isolating contacts should be installed on the outgoing line side of the main switch and on both sides of the busbar section switch. Section 3 Transformer Selection
Article 3.3.1 The number of transformers should be selected according to load characteristics and economic operation. When one of the following conditions is met, two or more transformers should be installed: 1. There are a large number of primary or secondary loads;
2. The seasonal load changes greatly;
3. The concentrated load is large.
Article 3.3.2 For a substation equipped with two or more transformers, when any of the transformers is disconnected, the capacity of the remaining transformers should meet the power consumption of the primary and secondary loads.
Article 3.3.3 The capacity of a single transformer (low voltage is 0.4kV) in a substation should not be greater than 1250kVA. When the capacity of the power equipment is large, the load is concentrated and the operation is reasonable, a larger capacity transformer can be selected.
Article 3.3.4 Under normal circumstances, power and lighting should share a transformer. When it is one of the following situations, a dedicated transformer can be installed: 1. When the lighting load is large or the use of a common transformer for power and lighting seriously affects the lighting quality and the life of the bulb, a dedicated lighting transformer can be installed. 2. When the single-phase load of a single unit is large, a single-phase transformer should be installed; 3. When the impact load is large and seriously affects the quality of electric energy, a dedicated transformer for impact load can be installed.
4. In the low-voltage power grid where the power supply system is not grounded or grounded through impedance, and the exposed conductor of the electrical device is grounded locally (IT system), a dedicated transformer for lighting load should be installed. Article 3.3.5 In the substation in the main building of multi-story or high-rise buildings, non-combustible or flame-retardant transformers should be selected.
Article 3.3.6
In places where dust or corrosive gases seriously affect the safe operation of transformers, dust-proof or anti-corrosion transformers should be selected. Section 4 Power supply
The power supply for the distribution station should be drawn from the nearest distribution transformer Article 3.4.1
220/380V side. Important or large-scale distribution stations should be equipped with transformers. The amount of oil in the combustible oil-immersed transformer used in the cabinet should be less than 100kg. When there are two-circuit power supplies, it is advisable to install an automatic power supply device for the equipment. Article 3.4.2 When AC operation is adopted, the power supply for operation, control, protection, signal, etc. can be drawn from the voltage transformer. Article 3.4.3 When the electromagnetic operating mechanism adopts silicon rectifier closing, it is advisable to set up two-circuit power supplies, one of which should be drawn from the transformer connected in front of the power supply incoming circuit breaker.
Section 5 Operation Power Supply
Article 3.5.1 For power distribution stations or large power distribution stations supplying primary loads, when equipped with circuit breakers with electromagnetic operating mechanisms, 220V or 110V storage batteries should be used as the DC power supply for closing and opening. When equipped with circuit breakers with spring energy storage operating mechanisms, small-capacity cadmium-nickel battery devices should be used as the power supply for closing and opening. Article 3.5.2 For medium-sized power distribution stations, when equipped with circuit breakers with electromagnetic operating mechanisms, silicon rectifiers should be used for closing power supply, and small-capacity cadmium-nickel battery devices or capacitor energy storage can be used for opening power supply. When supplying power to important loads, cadmium-nickel battery devices should be used for closing and opening power supply. When equipped with circuit breakers with spring energy storage operating mechanisms, small-capacity cadmium-nickel battery devices or capacitor energy storage silicon rectifier devices should be used as the power supply for closing and opening. When silicon rectifier is used as the closing power supply of electromagnetic operating mechanism, it should be verified that the rectifier closing power supply can ensure the reliable closing of circuit breaker in the event of an accident. Article 3.5.3 Small power distribution station should adopt full AC operation of spring energy storage operating mechanism closing and de-shunt opening.
Engineering Construction Standard Full Text Information SystemArticle 13 The installation of the primary switch of the transformer shall comply with the following provisions: 1. When the power supply is in the trunk type, a switchgear with protection or a drop-out fuse shall be installed. 2. When the power supply is in the radial type, an isolating switch or a load switch shall be installed. When the transformer engineering construction standard full text information system is in the power distribution station, the switch may not be installed. Article 3.2.14 The main switch of the transformer secondary side voltage is 6kV or 3kV, and an isolating switch or an isolating contact may be used. When one of the following situations occurs, a circuit breaker shall be used: 1. There are many outgoing line circuits, 2. There is a requirement for parallel operation; 3. There is a requirement for relay protection and automatic devices. Article 3.2.15 The main switch of the transformer low-voltage side voltage is 0.4kV, and a low-voltage circuit breaker or an isolating switch shall be used. When there is a requirement for relay protection or automatic power switching, low-voltage circuit breakers should be used for both the low-voltage main switch and the busbar section switch. Article 3.2.16 When the low-voltage bus is a dual power source and the transformer low-voltage main switch and busbar section switch use low-voltage circuit breakers, knife switches or isolating contacts should be installed on the outgoing line side of the main switch and on both sides of the busbar section switch. Section 3 Transformer Selection
Article 3.3.1 The number of transformers should be selected based on load characteristics and economic operation. When one of the following conditions is met, two or more transformers should be installed: 1. There are a large number of primary or secondary loads;
2. The seasonal load changes greatly;
3. The concentrated load is large.
Article 3.3.2 For substations equipped with two or more transformers, when any of the transformers is disconnected, the capacity of the remaining transformers should meet the power consumption of the primary and secondary loads.
Article 3.3.3 The capacity of a single transformer (low voltage is 0.4kV) in a substation should not be greater than 1250kVA. When the capacity of the power equipment is large, the load is concentrated and the operation is reasonable, a transformer with a larger capacity can be selected.
Article 3.3.4 Under normal circumstances, power and lighting should share a transformer. When one of the following situations occurs, a dedicated transformer can be installed: 1. When the lighting load is large or the use of a shared transformer for power and lighting seriously affects the lighting quality and the life of the bulb, a dedicated lighting transformer can be installed. 2. When a single single-phase load is large, a single-phase transformer should be installed; 3. When the impact load is large and seriously affects the quality of electric energy, a dedicated impact load transformer can be installed.
4. In the low-voltage power grid where the power system is not grounded or grounded through impedance, and the exposed conductor of the electrical device is grounded locally (IT system), a dedicated transformer should be installed for the lighting load. Article 3.3.5 For substations in multi-story or high-rise main buildings, non-flammable or flame-retardant transformers should be used.
Article 3.3.6
In places where dust or corrosive gases seriously affect the safe operation of transformers, dust-proof or corrosion-resistant transformers should be used. Section 4 Power Supply
The power supply used in the distribution station should be drawn from the nearest distribution transformer Article 3.4.1
220/380V side. Important or large-scale distribution stations should be equipped with transformers. The amount of oil in the combustible oil-immersed transformer used in the cabinet should be less than 100kg. When there are two circuits of power supply, it is advisable to install an automatic power supply device for equipment. Article 3.4.2 When AC operation is adopted, the power supply for operation, control, protection, signal, etc. can be drawn from the voltage transformer. Article 3.4.3 When the electromagnetic operating mechanism uses silicon rectifier for closing, it is advisable to set up two circuits of power supply, one of which should be drawn from the transformer used in front of the power supply incoming circuit breaker.
Section 5 Operation Power Supply
Article 3.5.1 For distribution stations or large distribution stations that supply primary loads, when equipped with circuit breakers with electromagnetic operating mechanisms, 220V or 110V battery packs should be used as the DC operating power supply for closing and opening. When equipped with circuit breakers with spring energy storage operating mechanisms, small-capacity cadmium-nickel battery devices should be used as the operating power supply for closing and opening. Article 3.5.2 For medium-sized distribution stations, when equipped with circuit breakers with electromagnetic operating mechanisms, the closing power supply should use silicon rectifiers, and the opening power supply can use small-capacity cadmium-nickel battery devices or engineering construction standard full-text information system
engineering construction standard full-text information system
capacitor energy storage. When supplying power to important loads, cadmium-nickel battery devices should be used for the power supply of the switch and the opening power supply. When a circuit breaker is equipped with a spring energy storage operating mechanism, a small-capacity cadmium nickel battery device or a capacitor energy storage silicon rectifier device should be used as the power supply for closing and opening operations. When a silicon rectifier is used as the closing power supply for the electromagnetic operating mechanism, it should be verified that the rectifier closing power supply can ensure that the circuit breaker can be closed reliably in the event of an accident. Article 3.5.3 Small distribution stations should use full AC operation for closing and de-shunt opening of spring energy storage operating mechanisms.
Engineering Construction Standard Full Text Information SystemArticle 13 The installation of the primary switch of the transformer shall comply with the following provisions: 1. When the power supply is in the trunk type, a switchgear with protection or a drop-out fuse shall be installed. 2. When the power supply is in the radial type, an isolating switch or a load switch shall be installed. When the transformer engineering construction standard full text information system is in the power distribution station, the switch may not be installed. Article 3.2.14 The main switch of the transformer secondary side voltage is 6kV or 3kV, and an isolating switch or an isolating contact may be used. When one of the following situations occurs, a circuit breaker shall be used: 1. There are many outgoing line circuits, 2. There is a requirement for parallel operation; 3. There is a requirement for relay protection and automatic devices. Article 3.2.15 The main switch of the transformer low-voltage side voltage is 0.4kV, and a low-voltage circuit breaker or an isolating switch shall be used. When there is a requirement for relay protection or automatic power switching, low-voltage circuit breakers should be used for both the low-voltage main switch and the busbar section switch. Article 3.2.16 When the low-voltage bus is a dual power source and the transformer low-voltage main switch and busbar section switch use low-voltage circuit breakers, knife switches or isolating contacts should be installed on the outgoing line side of the main switch and on both sides of the busbar section switch. Section 3 Transformer Selection
Article 3.3.1 The number of transformers should be selected based on load characteristics and economic operation. When one of the following conditions is met, two or more transformers should be installed: 1. There are a large number of primary or secondary loads;
2. The seasonal load changes greatly;
3. The concentrated load is large.
Article 3.3.2 For substations equipped with two or more transformers, when any of the transformers is disconnected, the capacity of the remaining transformers should meet the power consumption of the primary and secondary loads.
Article 3.3.3 The capacity of a single transformer (low voltage is 0.4kV) in a substation should not be greater than 1250kVA. When the capacity of the power equipment is large, the load is concentrated and the operation is reasonable, a transformer with a larger capacity can be selected.
Article 3.3.4 Under normal circumstances, power and lighting should share a transformer. When one of the following situations occurs, a dedicated transformer can be installed: 1. When the lighting load is large or the use of a shared transformer for power and lighting seriously affects the lighting quality and the life of the bulb, a dedicated lighting transformer can be installed. 2. When a single single-phase load is large, a single-phase transformer should be installed; 3. When the impact load is large and seriously affects the quality of electric energy, a dedicated impact load transformer can be installed.
4. In the low-voltage power grid where the power system is not grounded or grounded through impedance, and the exposed conductor of the electrical device is grounded locally (IT system), a dedicated transformer should be installed for the lighting load. Article 3.3.5 For substations in multi-story or high-rise main buildings, non-flammable or flame-retardant transformers should be used.
Article 3.3.6
In places where dust or corrosive gases seriously affect the safe operation of transformers, dust-proof or corrosion-resistant transformers should be used. Section 4 Power Supply
The power supply used in the distribution station should be drawn from the nearest distribution transformer Article 3.4.1
220/380V side. Important or large-scale distribution stations should be equipped with transformers. The amount of oil in the combustible oil-immersed transformer used in the cabinet should be less than 100kg. When there are two circuits of power supply, it is advisable to install an automatic power supply device for equipment. Article 3.4.2 When AC operation is adopted, the power supply for operation, control, protection, signal, etc. can be drawn from the voltage transformer. Article 3.4.3 When the electromagnetic operating mechanism uses silicon rectifier for closing, it is advisable to set up two circuits of power supply, one of which should be drawn from the transformer used in front of the power supply incoming circuit breaker.
Section 5 Operation Power Supply
Article 3.5.1 For distribution stations or large distribution stations that supply primary loads, when equipped with circuit breakers with electromagnetic operating mechanisms, 220V or 110V battery packs should be used as the DC operating power supply for closing and opening. When equipped with circuit breakers with spring energy storage operating mechanisms, small-capacity cadmium-nickel battery devices should be used as the operating power supply for closing and opening. Article 3.5.2 For medium-sized distribution stations, when equipped with circuit breakers with electromagnetic operating mechanisms, the closing power supply should use silicon rectifiers, and the opening power supply can use small-capacity cadmium-nickel battery devices or engineering construction standard full-text information system
engineering construction standard full-text information system
capacitor energy storage. When supplying power to important loads, cadmium-nickel battery devices should be used for the power supply of the switch and the opening power supply. When a circuit breaker is equipped with a spring energy storage operating mechanism, a small-capacity cadmium nickel battery device or a capacitor energy storage silicon rectifier device should be used as the power supply for closing and opening operations. When a silicon rectifier is used as the closing power supply for the electromagnetic operating mechanism, it should be verified that the rectifier closing power supply can ensure that the circuit breaker can be closed reliably in the event of an accident. Article 3.5.3 Small distribution stations should use full AC operation for closing and de-shunt opening of spring energy storage operating mechanisms.
Engineering Construction Standard Full Text Information SystemArticle 2 When a medium-sized distribution station is equipped with a circuit breaker with an electromagnetic operating mechanism, the closing power supply should adopt silicon rectifier, and the opening power supply can adopt a small-capacity cadmium-nickel battery device or a capacitor energy storage. When supplying power to important loads, a cadmium-nickel battery device should be used for the closing and opening power supply. When a circuit breaker is equipped with a spring energy storage operating mechanism, a small-capacity cadmium-nickel battery device or a capacitor energy storage silicon rectifier device should be used as the closing and opening operation power supply. When using silicon rectifier as the closing power supply for the electromagnetic operating mechanism, it should be verified that the rectifier closing power supply can ensure that the circuit breaker can be reliably closed in the event of an accident. Article 3.5.3 Small distribution stations should adopt full AC operation of spring energy storage operating mechanism for closing and de-shunt opening.
Engineering Construction Standard Full Text Information SystemArticle 2 When a medium-sized distribution station is equipped with a circuit breaker with an electromagnetic operating mechanism, the closing power supply should adopt silicon rectifier, and the opening power supply can adopt a small-capacity cadmium-nickel battery device or a capacitor energy storage. When supplying power to important loads, a cadmium-nickel battery device should be used for the closing and opening power supply. When a circuit breaker is equipped with a spring energy storage operating mechanism, a small-capacity cadmium-nickel battery device or a capacitor energy storage silicon rectifier device should be used as the closing and opening operation power supply. When using silicon rectifier as the closing power supply for the electromagnetic operating mechanism, it should be verified that the rectifier closing power supply can ensure that the circuit breaker can be reliably closed in the event of an accident. Article 3.5.3 Small distribution stations should adopt full AC operation of spring energy storage operating mechanism for closing and de-shunt opening.
Engineering Construction Standard Full Text Information System
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