CN116826948A - Nuclear power plant DEC electrical system and power supply method - Google Patents
Nuclear power plant DEC electrical system and power supply method Download PDFInfo
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- CN116826948A CN116826948A CN202310407287.9A CN202310407287A CN116826948A CN 116826948 A CN116826948 A CN 116826948A CN 202310407287 A CN202310407287 A CN 202310407287A CN 116826948 A CN116826948 A CN 116826948A
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- 238000002955 isolation Methods 0.000 claims description 24
- 238000012360 testing method Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 claims description 3
- 230000007123 defense Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000000703 anti-shock Effects 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
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Abstract
The disclosure belongs to the technical field of nuclear power, and particularly relates to a nuclear power plant DEC electrical system and a power supply method. The nuclear power plant DEC electrical system disclosed by the invention provides reliable power supply and distribution loop for plant electrical equipment required for relieving serious accident consequences under the working condition of the DEC, and meets the safety target of the nuclear power plant and the overall requirements of deep defense. And the special anti-seismic DEC electrical system is not provided with an anti-seismic standby diesel generator set and medium-voltage, low-voltage, direct-current and UPS electrical systems, so that the capacity of the anti-seismic diesel generator set is greatly reduced. Meanwhile, the purchase, installation and special anti-seismic factory building cost of the anti-seismic electric system of the nuclear power plant are reduced, and the economical efficiency of the electric system is remarkably improved.
Description
Technical Field
The invention belongs to the technical field of nuclear power, and particularly relates to a nuclear power plant DEC electrical system and a power supply method.
Background
In the type of Hua-long No. one, in order to meet the relevant requirements of national design safety regulations of nuclear power plants (HAF 102), design of electric systems of nuclear power plants (HAD 102/13) and other regulation standards, redundant safety-grade factory electric systems are strictly adopted, so that the electric systems are complex in structure, high in cost and complex in maintenance, with the latest research of nuclear safety, the national design safety regulations of nuclear power plants (HAF 102) are raised in 2016, DEC (design expansion working conditions, design Extension Condition) is adopted to replace over-design standard accidents, and if the design scheme of the safety-grade factory electric systems of Hua-long No. one is continuously adopted to meet the requirements of the raising plate regulations, the cost of the electric systems is further increased, and on the premise of ensuring the safety and reliability, the economical efficiency of the factory electric systems is improved.
Disclosure of Invention
In order to overcome the problems in the related art, a DEC electrical system and a power supply method of a nuclear power plant are provided.
According to an aspect of an embodiment of the present disclosure, there is provided a nuclear power plant DEC electrical system, the system comprising: the device comprises a bus for a DEC medium voltage plant, a DEC diesel generator set, a first circuit breaker, a second circuit breaker and a third circuit breaker;
the method comprises the steps that a bus for a DEC medium voltage plant is connected with a bus for a reliable medium voltage plant through a third circuit breaker, a standby diesel generator set is connected with the bus for the reliable medium voltage plant through a second circuit breaker, the bus for the reliable medium voltage plant is connected with a bus for a normal medium voltage plant through a first circuit breaker, the bus for the DEC diesel generator set is connected with the bus for the DEC medium voltage plant through a fourth circuit breaker, a plurality of target loads are respectively connected with the bus for the DEC medium voltage plant, a plurality of other loads are respectively connected with the bus for the reliable medium voltage plant, wherein the target loads are in-plant electric equipment which is required for relieving accident results under the working condition of the DEC, and the other loads are other in-plant electric equipment except the target loads;
under normal working conditions, the first circuit breaker and the third circuit breaker are normally closed, the second circuit breaker and the fourth circuit breaker are normally open, and the bus for the DEC medium voltage plant is powered by the bus for the normal medium voltage plant; under the working condition that all the off-plant power supplies are lost, the first circuit breaker is opened, and the second circuit breaker is closed after the standby diesel generator set is started, so that the standby diesel generator set supplies power to a plurality of target loads through the reliable medium-voltage bus and the DEC medium-voltage bus in sequence; under the working condition that all the external power supply and the internal alternating current standby power supply are lost, the third circuit breaker is opened, and the fourth circuit breaker is closed after the DEC diesel generator set is started, so that the DEC diesel generator set supplies power to a plurality of target loads through the bus for the DEC medium-voltage plant;
the system comprises a plurality of reliable medium-voltage factory buses, standby diesel generator sets connected with each reliable medium-voltage factory bus and connecting lines between each reliable medium-voltage factory bus and the corresponding standby diesel generator set are non-anti-seismic.
In one possible implementation, the plurality of target loads includes: the system comprises an upper charging pump, a waste heat discharging pump, an electric fire pump, 380V low-voltage equipment and a DEC direct current system, wherein the DEC direct current system is used for supplying power to a direct current load and a UPS system respectively, and the UPS system is used for supplying power to the UPS load.
In one possible implementation, under the condition that the nuclear power plant has earthquake, the off-site alternating current power supply and the on-site alternating current standby power supply are lost, and if a fire disaster occurs, the third circuit breaker is closed after the DEC diesel generator set is started, so that the DEC diesel generator set supplies power for the electric fire pump.
In one possible implementation, the dc load includes a fire isolation valve for isolating a fire pipe within the anti-seismic structure from a fire pipe within the non-anti-seismic structure;
under the working condition that the nuclear power plant has earthquake, the external alternating current power supply and the internal alternating current standby power supply are lost, and if a fire disaster occurs, the DEC diesel generator set is started;
under the condition that the DEC diesel generator set is started and not put into operation, controlling the DEC diesel generator set to supply power to the fire-fighting isolation valve through a DEC direct-current system, and then controlling the fire-fighting isolation valve to be reliably closed;
and under the condition that the fire control isolation valve is reliably closed, closing the third circuit breaker to enable the DEC diesel generator set to supply power for the electric fire pump.
In one possible implementation, the dc load further comprises a discharge test device for testing the DEC dc system.
In one possible implementation, the DEC direct current system includes a battery pack and a charger connected to a DEC medium voltage plant bus through a DEC low voltage transformer;
before the DEC diesel generator set is started and loaded, a storage battery provides power for a direct current load and a UPS load, and a circuit breaker is arranged between the charger and the direct current load and between the charger and the UPS load;
after the DEC diesel generator set is started and loaded, a passage is formed between the charger and the direct current load and between the charger and the UPS load, and the charger supplies power for the direct current load and the UPS load and charges the storage battery.
In one possible implementation, the DEC-UPS system includes an inverter connected to the DEC dc system and the DEC low voltage transformer, respectively;
under the working condition that a DEC direct current system normally operates, an open circuit is arranged between the inverter and the DEC low-voltage transformer, a passage is arranged between the inverter and the DEC direct current system, and the DEC-UPS system is powered by the DEC direct current system;
under the working condition that a DEC direct current system is lost, a passage is formed between the inverter and the DEC low-voltage transformer, a circuit is formed between the inverter and the DEC direct current system, and the DEC-UPS system is powered by a bus for a DEC medium-voltage plant through the DEC low-voltage transformer.
In one possible implementation, the UPS load includes a power plant meter, control and monitoring devices, and a safety level UPS system for providing UPS power to the meter and control devices that handle DEC conditions, meeting the needs of reactor and power plant status monitoring within 72 hours to 7 days after a plant outage incident.
According to another aspect of the disclosed embodiments, there is provided a method for supplying power to a DEC of a nuclear power plant, the method being applied to the above system, the method including:
under normal working conditions, the first circuit breaker and the third circuit breaker are normally closed, the second circuit breaker and the fourth circuit breaker are normally open, and the bus for the DEC medium voltage plant is powered by the bus for the normal medium voltage plant;
under the working condition that all the off-plant power supplies are lost, the first circuit breaker is opened, and the second circuit breaker is closed after the standby diesel generator set is started, so that the standby diesel generator set supplies power to a plurality of target loads through the reliable medium-voltage bus and the DEC medium-voltage bus in sequence;
and under the working condition that all the off-site power supply and the in-site alternating current standby power supply are lost, the third circuit breaker is opened, and the fourth circuit breaker is closed after the DEC diesel generator set is started, so that the DEC diesel generator set supplies power to a plurality of target loads through the bus for the DEC medium-voltage plant.
In one possible implementation manner, a method for supplying power to a DEC of a nuclear power plant is provided, and the method is applied to the system, and includes: under the working condition that the nuclear power plant is earthquake, the external alternating current power supply and the internal alternating current standby power supply are lost, if a fire disaster occurs, the third circuit breaker is closed after the DEC diesel generator set is started, and the DEC diesel generator set supplies power for the electric fire pump.
In one possible implementation manner, a method for supplying power to a DEC of a nuclear power plant is provided, and the method is applied to the system, and includes:
under the working condition that the nuclear power plant has earthquake, the external alternating current power supply and the internal alternating current standby power supply are lost, and if a fire disaster occurs, the DEC diesel generator set is started;
under the condition that the DEC diesel generator set is started and not put into operation, the DEC diesel generator set is controlled to supply power to the fire-fighting isolation valve through the DEC direct-current system, and then the fire-fighting isolation valve is controlled to be reliably closed;
and under the condition that the fire control isolation valve is reliably closed, closing the third circuit breaker to enable the DEC diesel generator set to supply power for the electric fire pump.
In one possible implementation manner, a method for supplying power to a DEC of a nuclear power plant is provided, and the method is applied to the system, and includes:
before the DEC diesel generator set is started and loaded, a storage battery provides power for a direct current load and a UPS load, and a charger is disconnected with the direct current load and the UPS load;
after the DEC diesel generator set is started and loaded, a passage is formed between the charger and the direct current load and between the charger and the UPS load, and the charger supplies power for the direct current load and the UPS load and charges the storage battery.
According to another aspect of the disclosed embodiments, there is provided a method for supplying power to a DEC of a nuclear power plant, the method being applied to the above system, the method including:
under the working condition that the DEC direct current system normally operates, an open circuit is arranged between an inverter and a DEC low-voltage transformer, a passage is arranged between the inverter and the DEC direct current system, and the DEC-UPS system is powered by the DEC direct current system;
under the working condition that a DEC direct current system is lost, a passage is formed between an inverter and a DEC low-voltage transformer, a circuit breaker is formed between the inverter and the DEC direct current system, and the DEC-UPS system is powered by a bus for a DEC medium-voltage plant through the DEC low-voltage transformer.
The beneficial effects of the present disclosure are: the nuclear power plant DEC electrical system disclosed by the invention provides reliable power supply and distribution loop for plant electrical equipment required for relieving serious accident consequences under the working condition of the DEC, and meets the safety target of the nuclear power plant and the overall requirements of deep defense. And the special anti-seismic DEC electrical system is not provided with an anti-seismic standby diesel generator set and medium-voltage, low-voltage, direct-current and UPS electrical systems, so that the capacity of the anti-seismic diesel generator set is greatly reduced. Meanwhile, the purchase, installation and special anti-seismic factory building cost of the anti-seismic electric system of the nuclear power plant are reduced, and the economical efficiency of the electric system is remarkably improved.
Drawings
FIG. 1 is a schematic diagram of a nuclear power plant DEC electrical system, according to an exemplary embodiment.
Fig. 2 is a schematic diagram of a DEC dc system and a DEC-UPS system, according to an example embodiment.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
FIG. 1 is a schematic diagram of a nuclear power plant DEC electrical system, as shown in FIG. 1, according to an exemplary embodiment, including: the system comprises a bus EMC for a DEC medium voltage factory, a DEC diesel generator set, a first circuit breaker, a second circuit breaker and a third circuit breaker;
the method comprises the steps that a DEC medium voltage factory bus EMC is connected with a reliable medium voltage factory bus EMA through a third circuit breaker, a standby diesel generator set is connected with the reliable medium voltage factory bus EMA through a second circuit breaker, the reliable medium voltage factory bus EMA is connected with a normal medium voltage factory bus EMD through a first circuit breaker, the DEC diesel generator set is connected with the DEC medium voltage factory bus EMC through a fourth circuit breaker, a plurality of target loads are respectively connected with the DEC medium voltage factory bus EMC, a plurality of other loads are respectively connected with the reliable medium voltage factory bus EMA, wherein the target loads are electric equipment in the factory which is necessary for relieving accident consequences under the working condition of the DEC, and the other loads are electric equipment in the factory except the target loads;
under normal working conditions, the first circuit breaker and the third circuit breaker are normally closed, the second circuit breaker and the fourth circuit breaker are normally open, and the bus EMC for the DEC medium voltage plant is powered by the bus EMD for the normal medium voltage plant; under the working condition that all off-plant power sources are lost, the first circuit breaker is opened, and the second circuit breaker is closed after the standby diesel generator set is started, so that the standby diesel generator set supplies power to a plurality of target loads sequentially through reliable medium-voltage bus EMA and DEC medium-voltage bus EMC; under the working condition that all the external power supply and the internal alternating current standby power supply are lost, the third circuit breaker is opened, and the fourth circuit breaker is closed after the DEC diesel generator set is started, so that the DEC diesel generator set supplies power to a plurality of target loads through a bus EMC for a DEC medium-voltage plant;
the DEC medium voltage plant bus EMC, the plurality of target loads, the third circuit breaker, and the connection lines between the DEC medium voltage plant bus EMC and the plurality of target loads, the third circuit breaker may be of an anti-shock type, the power plant system may include a plurality of reliable medium voltage plant buses EMA, wherein the plurality of reliable medium voltage plant buses EMA, the backup diesel generator sets connected by each reliable medium voltage plant bus EMA, and the connection lines between each reliable medium voltage plant bus EMA and the corresponding backup diesel generator sets may be of a non-anti-shock type.
The nuclear power plant DEC electrical system disclosed by the invention provides reliable power supply and distribution loop for plant electrical equipment required for relieving serious accident consequences under the working condition of the DEC, and meets the safety target of the nuclear power plant and the overall requirements of deep defense. And the special anti-seismic DEC electrical system is not provided with an anti-seismic standby diesel generator set and medium-voltage, low-voltage, direct-current and UPS electrical systems, so that the capacity of the anti-seismic diesel generator set is greatly reduced. Meanwhile, the purchase, installation and special anti-seismic factory building cost of the anti-seismic electric system of the nuclear power plant are reduced, and the economical efficiency of the electric system is remarkably improved.
In one possible implementation, the plurality of target loads includes: the system comprises an upper charging pump, a waste heat discharging pump, an electric fire pump, 380V low-voltage equipment and a DEC direct current system, wherein the DEC direct current system is used for supplying power to a direct current load and a UPS system respectively, and the UPS system is used for supplying power to the UPS load.
In one possible implementation, under the condition that the nuclear power plant has earthquake, the off-site alternating current power supply and the on-site alternating current standby power supply are lost, and if a fire disaster occurs, the third circuit breaker is closed after the DEC diesel generator set is started, so that the DEC diesel generator set supplies power for the electric fire pump.
In one possible implementation, the dc load includes a fire isolation valve for isolating a fire pipe within the anti-seismic structure from a fire pipe within the non-anti-seismic structure; under the working condition that the nuclear power plant has earthquake, the external alternating current power supply and the internal alternating current standby power supply are lost, and if a fire disaster occurs, the DEC diesel generator set is started; under the condition that the DEC diesel generator set is started and not put into operation, controlling the DEC diesel generator set to supply power to the fire-fighting isolation valve through a DEC direct-current system, and then controlling the fire-fighting isolation valve to be reliably closed; and under the condition that the fire control isolation valve is reliably closed, closing the third circuit breaker to enable the DEC diesel generator set to supply power for the electric fire pump.
In general, after a nuclear power plant encounters an earthquake, a fire water supply pipeline in a non-earthquake-resistant structure is damaged due to the earthquake, and before a DEC standby diesel generator set is started and put into operation, in order to reliably close an isolation valve between fire pipelines in the earthquake-resistant and non-earthquake-resistant structure in time, the isolation valve is powered by a special DEC direct current system to ensure the reliable closing of the isolation valve, so that fire water loss and flooding events caused by the breakage of the fire pipelines are effectively avoided.
In one possible implementation, the dc load further comprises a discharge test device for testing the DEC dc system.
FIG. 2 is a schematic diagram of a DEC DC system and a DEC-UPS system, including a battery pack and a charger connected to a DEC medium voltage plant bus EMC through a DEC low voltage transformer, as shown in FIG. 2, according to an exemplary embodiment; before the DEC diesel generator set is started and loaded, a storage battery provides power for a direct current load and a UPS load, and a circuit breaker is arranged between the charger and the direct current load and between the charger and the UPS load; after the DEC diesel generator set is started and loaded, a passage is formed between the charger and the direct current load and between the charger and the UPS load, and the charger supplies power for the direct current load and the UPS load and charges the storage battery. Therefore, continuous power supply to the DEC direct current system can be ensured, and the diversity setting of the power supply can be realized, so that the common mode fault risk of the electrical system is reduced to the minimum.
In one possible implementation, the DEC-UPS system includes an inverter connected to the DEC dc system and the DEC low voltage transformer, respectively. Under the working condition that the DEC direct current system normally operates, an open circuit is arranged between the inverter and the DEC low-voltage transformer, a passage is arranged between the inverter and the DEC direct current system, and the DEC-UPS system is powered by the DEC direct current system. Under the working condition that a DEC direct current system is lost, a passage is formed between the inverter and the DEC low-voltage transformer, a circuit break is formed between the inverter and the DEC direct current system, and the DEC-UPS system is powered by a bus EMC for a DEC medium-voltage plant through the DEC low-voltage transformer.
In one possible implementation, the UPS load includes a power plant meter, control and monitoring devices, and a safety level UPS system for providing UPS power to the meter and control devices that handle DEC conditions, meeting the needs of reactor and power plant status monitoring within 72 hours to 7 days after a plant outage incident.
In one possible implementation manner, a method for supplying power to a DEC of a nuclear power plant is provided, and the method is applied to the system, and includes:
under normal working conditions, the first circuit breaker and the third circuit breaker are normally closed, the second circuit breaker and the fourth circuit breaker are normally open, and the bus EMC for the DEC medium voltage plant is powered by the bus EMD for the normal medium voltage plant;
under the working condition that all off-plant power sources are lost, the first circuit breaker is opened, and the second circuit breaker is closed after the standby diesel generator set is started, so that the standby diesel generator set supplies power to a plurality of target loads sequentially through reliable medium-voltage bus EMA and DEC medium-voltage bus EMC;
and under the working condition that all the off-site power supply and the in-site alternating current standby power supply are lost, the third circuit breaker is opened, and the fourth circuit breaker is closed after the DEC diesel generator set is started, so that the DEC diesel generator set supplies power to a plurality of target loads through the EMC of the bus for the DEC medium-voltage plant.
In one possible implementation, the method includes: under the working condition that the nuclear power plant is earthquake, the external alternating current power supply and the internal alternating current standby power supply are lost, if a fire disaster occurs, the third circuit breaker is closed after the DEC diesel generator set is started, and the DEC diesel generator set supplies power for the electric fire pump.
In one possible implementation, the method includes:
under the working condition that the nuclear power plant has earthquake, the external alternating current power supply and the internal alternating current standby power supply are lost, and if a fire disaster occurs, the DEC diesel generator set is started;
under the condition that the DEC diesel generator set is started and not put into operation, the DEC diesel generator set is controlled to supply power to the fire-fighting isolation valve through the DEC direct-current system, and then the fire-fighting isolation valve is controlled to be reliably closed;
and under the condition that the fire control isolation valve is reliably closed, closing the third circuit breaker to enable the DEC diesel generator set to supply power for the electric fire pump.
In one possible implementation, the method includes:
before the DEC diesel generator set is started and loaded, a storage battery provides power for a direct current load and a UPS load, and a charger is disconnected with the direct current load and the UPS load;
after the DEC diesel generator set is started and loaded, a passage is formed between the charger and the direct current load and between the charger and the UPS load, and the charger supplies power for the direct current load and the UPS load and charges the storage battery.
In a possible implementation manner, the method is applied to the system of claim 7, and the method includes:
under the working condition that the DEC direct current system normally operates, an open circuit is arranged between an inverter and a DEC low-voltage transformer, a passage is arranged between the inverter and the DEC direct current system, and the DEC-UPS system is powered by the DEC direct current system;
under the working condition that a DEC direct current system is lost, a passage is formed between an inverter and a DEC low-voltage transformer, a circuit breaker is formed between the inverter and the DEC direct current system, and the DEC-UPS system is powered by a bus EMC for a DEC medium-voltage plant through the DEC low-voltage transformer.
For the description of the above method, reference may be made to the description of the above system, and the description is not repeated here.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (13)
1. A nuclear power plant DEC electrical system, the system comprising: the device comprises a bus for a DEC medium voltage plant, a DEC diesel generator set, a first circuit breaker, a second circuit breaker and a third circuit breaker;
the method comprises the steps that a bus for a DEC medium voltage plant is connected with a bus for a reliable medium voltage plant through a third circuit breaker, a standby diesel generator set is connected with the bus for the reliable medium voltage plant through a second circuit breaker, the bus for the reliable medium voltage plant is connected with a bus for a normal medium voltage plant through a first circuit breaker, the bus for the DEC diesel generator set is connected with the bus for the DEC medium voltage plant through a fourth circuit breaker, a plurality of target loads are respectively connected with the bus for the DEC medium voltage plant, a plurality of other loads are respectively connected with the bus for the reliable medium voltage plant, wherein the target loads are in-plant electric equipment which is required for relieving accident results under the working condition of the DEC, and the other loads are other in-plant electric equipment except the target loads;
under normal working conditions, the first circuit breaker and the third circuit breaker are normally closed, the second circuit breaker and the fourth circuit breaker are normally open, and the bus for the DEC medium voltage plant is powered by the bus for the normal medium voltage plant; under the working condition that all the off-plant power supplies are lost, the first circuit breaker is opened, and the second circuit breaker is closed after the standby diesel generator set is started, so that the standby diesel generator set supplies power to a plurality of target loads through the reliable medium-voltage bus and the DEC medium-voltage bus in sequence; under the working condition that all the external power supply and the internal alternating current standby power supply are lost, the third circuit breaker is opened, and the fourth circuit breaker is closed after the DEC diesel generator set is started, so that the DEC diesel generator set supplies power to a plurality of target loads through the bus for the DEC medium-voltage plant;
the system comprises a plurality of reliable medium-voltage factory buses, standby diesel generator sets connected with each reliable medium-voltage factory bus and connecting lines between each reliable medium-voltage factory bus and the corresponding standby diesel generator set are non-anti-seismic.
2. The system of claim 1, wherein the plurality of target loads comprises: the system comprises an upper charging pump, a waste heat discharging pump, an electric fire pump, 380V low-voltage equipment and a DEC direct current system, wherein the DEC direct current system is used for supplying power to a direct current load and a UPS system respectively, and the UPS system is used for supplying power to the UPS load.
3. The system of claim 2, wherein during a nuclear power plant earthquake condition, the off-site ac power source and the on-site ac backup power source are lost, and if a fire occurs, the third circuit breaker is closed after the DEC diesel generator set is started, so that the DEC diesel generator set supplies power to the electric fire pump.
4. The system of claim 2, wherein the dc load comprises a fire isolation valve for isolating fire pipes within the anti-seismic structure from fire pipes within the non-anti-seismic structure;
under the working condition that the nuclear power plant has earthquake, the external alternating current power supply and the internal alternating current standby power supply are lost, and if a fire disaster occurs, the DEC diesel generator set is started;
under the condition that the DEC diesel generator set is started and not put into operation, controlling the DEC diesel generator set to supply power to the fire-fighting isolation valve through a DEC direct-current system, and then controlling the fire-fighting isolation valve to be reliably closed;
and under the condition that the fire control isolation valve is reliably closed, closing the third circuit breaker to enable the DEC diesel generator set to supply power for the electric fire pump.
5. The system of claim 2, wherein the dc load further comprises a discharge test device for testing the DEC dc system.
6. The system of claim 2, wherein the DEC dc system comprises a battery pack and a charger connected to a DEC medium voltage plant bus through a DEC low voltage transformer;
before the DEC diesel generator set is started and loaded, a storage battery provides power for a direct current load and a UPS load, and a circuit breaker is arranged between the charger and the direct current load and between the charger and the UPS load;
after the DEC diesel generator set is started and loaded, a passage is formed between the charger and the direct current load and between the charger and the UPS load, and the charger supplies power for the direct current load and the UPS load and charges the storage battery.
7. The system of claim 6, wherein the DEC-UPS system includes an inverter connected to the DEC dc system and the DEC low voltage transformer, respectively;
under the working condition that a DEC direct current system normally operates, an open circuit is arranged between the inverter and the DEC low-voltage transformer, a passage is arranged between the inverter and the DEC direct current system, and the DEC-UPS system is powered by the DEC direct current system;
under the working condition that a DEC direct current system is lost, a passage is formed between the inverter and the DEC low-voltage transformer, a circuit is formed between the inverter and the DEC direct current system, and the DEC-UPS system is powered by a bus for a DEC medium-voltage plant through the DEC low-voltage transformer.
8. The system of claim 6 or 7, wherein the UPS load comprises a power plant meter, control and monitoring means and a safety level UPS system for providing UPS power to the meter and control means for handling DEC conditions, meeting the requirements for reactor and power plant status monitoring within 72 hours to 7 days after a power outage incident in the whole plant.
9. A method for supplying power to a DEC in a nuclear power plant, said method being applied to the system of claim 1, said method comprising:
under normal working conditions, the first circuit breaker and the third circuit breaker are normally closed, the second circuit breaker and the fourth circuit breaker are normally open, and the bus for the DEC medium voltage plant is powered by the bus for the normal medium voltage plant;
under the working condition that all the off-plant power supplies are lost, the first circuit breaker is opened, and the second circuit breaker is closed after the standby diesel generator set is started, so that the standby diesel generator set supplies power to a plurality of target loads through the reliable medium-voltage bus and the DEC medium-voltage bus in sequence;
and under the working condition that all the off-site power supply and the in-site alternating current standby power supply are lost, the third circuit breaker is opened, and the fourth circuit breaker is closed after the DEC diesel generator set is started, so that the DEC diesel generator set supplies power to a plurality of target loads through the bus for the DEC medium-voltage plant.
10. The method according to claim 9, wherein the method is applied in the system of claim 2, the method comprising: under the working condition that the nuclear power plant is earthquake, the external alternating current power supply and the internal alternating current standby power supply are lost, if a fire disaster occurs, the third circuit breaker is closed after the DEC diesel generator set is started, and the DEC diesel generator set supplies power for the electric fire pump.
11. The method according to claim 9, wherein the method is applied in the system of claim 4, the method comprising:
under the working condition that the nuclear power plant has earthquake, the external alternating current power supply and the internal alternating current standby power supply are lost, and if a fire disaster occurs, the DEC diesel generator set is started;
under the condition that the DEC diesel generator set is started and not put into operation, the DEC diesel generator set is controlled to supply power to the fire-fighting isolation valve through the DEC direct-current system, and then the fire-fighting isolation valve is controlled to be reliably closed;
and under the condition that the fire control isolation valve is reliably closed, closing the third circuit breaker to enable the DEC diesel generator set to supply power for the electric fire pump.
12. The method according to claim 9, wherein the method is applied in the system of claim 6, the method comprising:
before the DEC diesel generator set is started and loaded, a storage battery provides power for a direct current load and a UPS load, and a charger is disconnected with the direct current load and the UPS load;
after the DEC diesel generator set is started and loaded, a passage is formed between the charger and the direct current load and between the charger and the UPS load, and the charger supplies power for the direct current load and the UPS load and charges the storage battery.
13. The method according to claim 9, characterized in that the method is applied in the system according to claim 7, the method comprising:
under the working condition that the DEC direct current system normally operates, an open circuit is arranged between an inverter and a DEC low-voltage transformer, a passage is arranged between the inverter and the DEC direct current system, and the DEC-UPS system is powered by the DEC direct current system;
under the working condition that a DEC direct current system is lost, a passage is formed between an inverter and a DEC low-voltage transformer, a circuit breaker is formed between the inverter and the DEC direct current system, and the DEC-UPS system is powered by a bus for a DEC medium-voltage plant through the DEC low-voltage transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310407287.9A CN116826948A (en) | 2023-04-17 | 2023-04-17 | Nuclear power plant DEC electrical system and power supply method |
Applications Claiming Priority (1)
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