CN214479622U - Power distribution system - Google Patents
Power distribution system Download PDFInfo
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- CN214479622U CN214479622U CN202120891261.2U CN202120891261U CN214479622U CN 214479622 U CN214479622 U CN 214479622U CN 202120891261 U CN202120891261 U CN 202120891261U CN 214479622 U CN214479622 U CN 214479622U
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Abstract
The application provides a power distribution system, including two at least units, first bus unit and switch unit, every unit includes power supply unit, second bus unit and third bus unit, power supply unit's first end is connected the first end of third bus unit, the second end of third bus unit is connected the first end of second bus unit, the third end of third bus unit is connected the first end of switch unit, the second end of switch unit is connected the first end of first bus unit, the second end of first bus unit is connected the second end of second bus unit. The application can improve the reliability of power supply.
Description
Technical Field
The application relates to the technical field of nuclear power plants, in particular to a power distribution system.
Background
For the existing nuclear power plant, an in-plant alternating current power supply system mainly comprises a main generator, a safety-level diesel generator set, an SBO (Station Black-out) diesel generator set, a mobile diesel generator set, an additional diesel generator set and the like, and the configuration of the alternating current power supply system is different according to different functions of an alternating current power distribution system of the nuclear power plant. During the operation of the power plant, the additional diesel generator set in the plant area provides a time window for power restoration after SBO and prolongs the maintenance time window (normal operation condition of the power plant) for scheduled maintenance and corrective maintenance of the emergency diesel generator. And a special power supply bus needs to be arranged for connecting an additional diesel generator and sending out an emergency bus of an indoor unit of the plant, but the special power supply bus is of a single power supply incoming line structure, so that the power supply reliability is low.
SUMMERY OF THE UTILITY MODEL
The application provides a power distribution system to solve the lower problem of power supply reliability.
The embodiment of the application provides a power distribution system, including two at least units, first bus unit and switch unit, every unit includes power supply unit, second bus unit and third bus unit, power supply unit's first end is connected the first end of third bus unit, the second end of third bus unit is connected the first end of second bus unit, the third end of third bus unit is connected the first end of switch unit, the second end of switch unit is connected the first end of first bus unit, the second end of first bus unit is connected the second end of second bus unit.
In the embodiment of the application, the third ends of the third bus units in the at least two units are connected with the first end of the first bus unit through the switch unit, and as long as any one of the at least two units can supply power to the first bus unit, the first bus unit can supply power to the second bus units in other units, so that the power supply reliability of the power distribution system is improved.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a power distribution system provided in an embodiment of the present application;
fig. 2 is a second schematic structural diagram of a power distribution system according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, taking a power distribution system of two units as an example, fig. 1 is a schematic structural diagram of the power distribution system provided in the embodiment of the present application. As shown in fig. 1, the power supply system comprises at least two units 10, a first bus bar unit 20 and a switch unit 30, each unit comprises a power supply unit 101, a second bus bar unit 102 and a third bus bar unit 103, a first end of the power supply unit 101 is connected with a first end of the third bus bar unit 103, a second end of the third bus bar unit 103 is connected with a first end of the second bus bar unit 102, a third end of the third bus bar unit 103 is connected with a first end of the switch unit 30, a second end of the switch unit 30 is connected with a first end of the first bus bar unit 20, and a second end of the first bus bar unit 20 is connected with a second end of the second bus bar unit 102.
The switch unit 30 may control the third end of the third bus bar unit 103 in each unit to be connected to or disconnected from the first end of the first bus bar unit 20, for example: as shown in fig. 1, if the power supply unit 101 of the unit 11 fails and the other unit 12 is operating normally, the power supply unit 101 in the unit 12 can supply power to the first bus bar unit 20 through the third bus bar unit 103, so that the second bus bar unit 102 of the unit 11 can be supplied power by the first bus bar unit 20.
It will be appreciated that the second busbar unit 102 may be used to power important electrical devices in the assembly, such as: in the case of planned and corrective maintenance for emergency diesel generators, it is necessary to supply the second bus bar unit 102 to maintain the normal operation of the nuclear power plant during the maintenance time. The existing nuclear power plant is generally provided with a plant area additional diesel generator to prolong a maintenance time window for the planned maintenance and the corrective maintenance of the emergency diesel generator, a special power supply bus is arranged to be used as the access of the additional diesel generator and the sending-out of an emergency bus of a plant unit, equipment with the same capacity as the emergency diesel generator needs to be configured, an additional diesel generator plant and supporting facilities and structures are arranged, and the follow-up operation and the maintenance are complex. Can be the power supply of the second bus unit in the arbitrary unit through above-mentioned first bus unit in this application, cancel additional diesel generating set equipment, additional diesel generating set factory building and supporting facility and structure, can reduce follow-up operation and overhaul relevant investment, improve the economic nature of nuclear power plant operation, many power supply inlet wire structures can also improve the reliability of power supply for single power supply inlet wire structure.
Specifically, for a unit in the power distribution system in normal operation or in isolated island operation, the first bus bar unit 20 may be used to supply power to the second bus bar unit 102 in the unit, for example: one of the at least two units that normally operates may be referred to as a first unit, and a unit other than the first unit of the at least two units may be referred to as a second unit, so that the switch unit may be configured to control the third end of the third bus unit 103 in the first unit to be connected to the first end of the first bus unit 20, and control the third end of the third bus unit 103 in the second unit to be disconnected from the first end of the first bus unit 20, so that as long as the power supply unit 10 of any one unit in the power distribution system can normally supply power, power can be guaranteed to be supplied to the first bus unit 20, and then power can be supplied to the second bus units 102 of other units.
In this embodiment, the third ends of the third bus bar units 103 in the at least two units are connected to the first end of the first bus bar unit 20 through the switch unit 30, and as long as any one of the at least two units 10 can supply power to the first bus bar unit 20, the first bus bar unit 20 can supply power to the second bus bar units 102 in other units, so as to improve the reliability of power supply of the power distribution system.
Further, a diesel generator may be connected to the second bus bar unit 102, and the power supply unit 101 may be a main power supply in the unit, and may supply power to the second bus bar unit 102 from the diesel generator when the power supply unit 101 cannot supply power. The second end of the second bus bar unit 12 of each unit is connected through the second end of the first bus bar unit 20, and when the power supply unit 101 cannot supply power, the second bus bar unit 102 in any unit can also directly supply power through the first bus bar unit 20, so that the workload of starting the diesel generator and the like is reduced.
Optionally, as shown in fig. 2, the switch unit 30 includes at least two sub-switch units, the at least two sub-switch units correspond to the at least two units 10 one to one, a third end of the third bus bar unit 103 in each unit is connected to a first end of the corresponding sub-switch unit, and a second end of the corresponding sub-switch unit is connected to a first end of the first bus bar unit 103.
The number and the connection relationship of the sub-switch units correspond to the number of the units 10 one to one, for example: the first unit 11 may correspond to the first sub switch unit 31, the second unit 12 may correspond to the second sub switch unit 32, and if the first unit 11 fails to supply power to the second bus bar unit 102, the first end and the second end of the first sub switch unit 31 may be controlled to be disconnected, and the first end and the second end of the second sub switch unit 32 may be controlled to be connected, so that the second unit 12 may supply power to the first bus bar unit 20 through the second sub switch unit 32, and further supply power to the second bus bar unit 102 in the first unit 11. In addition, at a certain time, the first end and the second end of only one sub-switch unit in the at least two sub-switch units are in a connected state, the first ends and the second ends of other sub-switch units are in an off state, and the sub-switch unit in the connected state corresponds to any one of the units which can normally supply power.
In this embodiment, the at least two sub-switch units correspond to the at least two units one to one, and whether the third end of the third bus unit 103 of the corresponding unit is communicated with the first end of the first bus unit 20 may be controlled by controlling whether the first end and the second end of each sub-switch unit are communicated, so that the second bus unit 102 of each unit can be powered as long as any unit exists in the nuclear power plant and can supply power to the first bus unit 20.
Optionally, as shown in fig. 2, each unit further includes a service power source 40, and the third end of the first bus bar unit is connected to the first end of the service power source 40.
In this embodiment, when the unit is overhauled, as long as any unit exists in the nuclear power plant and can supply power to the first bus unit 20, the power supply to the overhaul power supply 40 of each unit can be realized, and the overhaul safety is improved.
Alternatively, as shown in fig. 2, the first bus bar unit 20 includes a first bus bar 21, the second bus bar unit 102 includes a second bus bar 1021 and a third bus bar 1022, and the third bus bar unit 103 includes a fourth bus bar 1031, a fifth bus bar 1032, a sixth bus bar 1033, and a seventh bus bar 1034;
a first end of the power supply unit 101 is connected to a first end of the fourth bus bar 1031, a first end of the fifth bus bar 1032, a first end of the sixth bus bar 1033, and a first end of the seventh bus bar 1034, a second end of the fourth bus bar 1031 is connected to a first end of the second bus bar 1021, a second end of the fifth bus bar 1032 is connected to a first end of the third bus bar 1022, a second end of the seventh bus bar 1034 is connected to a first end of the switch unit 30, a second end of the switch unit 30 is connected to a first end of the first bus bar 21, a second end of the first bus bar 21 is connected to a second end of the second bus bar 1021, and a third end of the first bus bar 21 is connected to a second end of the third bus bar 1022;
the fourth end of the first busbar 21 is connected to a first end of the service power source 40.
It can be understood that the first bus 21 can be used as a dedicated power supply bus to supply power to the emergency bus second bus 1021 and the third bus 1022 in each unit, that is, each unit is provided with an incoming line loop to supply power to the first bus 21, so as to supply power to the second bus 1021 and the third bus 1022 in each unit, and for any unit, other generator sets in the nuclear power plant can be used as a power distribution source of the unit, so that a maintenance time window is prolonged for planned maintenance and corrective maintenance of the emergency diesel generator.
It should be noted that, the incoming line loop and the outgoing line loop of all the buses can be provided with a circuit breaker, so as to improve the safety of the unit operation.
In this embodiment, through a multi-power-supply incoming line structure, when any unit in a nuclear power plant can supply power to the first bus 21, the first bus 21 can be ensured to supply power to the second bus 1021 and the third bus 1022 in each unit, and the power supply to the maintenance power supply 40 is ensured, so that the reliability of power supply of the power distribution system is improved.
Alternatively, as shown in fig. 2, the power supply unit 101 includes a generator 1011, a first transformer 1012, a voltage boosting station 1013, and a first voltage transforming unit 1014, wherein a first end of the voltage boosting station 1013 is connected to a first end of the first transformer 1012, a first end of the generator 1011 and a second end of the first transformer 1012 are connected to a first end of the first voltage transforming unit 1014, and a first end of the generator 1011 is connected to a first end of the voltage boosting station 1013;
a second end of the first transforming unit 1014 is connected to a first end of the fourth bus bar 1031, a third end of the first transforming unit 1014 is connected to a first end of the fifth bus bar 1032, a fourth end of the first transforming unit 1014 is connected to a first end of the sixth bus bar 1033, and a fifth end of the first transforming unit 1014 is connected to a first end of the seventh bus bar 1034.
Specifically, the first transformer 1012 may be a main transformer, the voltage boosting station 1013 is a 500kV voltage boosting station, the electric energy generated by the generator 1011 may be transmitted to the power grid through the first transformer 1012 and the voltage boosting station 1013, the power grid may also transmit the electric energy to the voltage boosting station 1013, a switch may be provided between a first end of the generator 1011 and a first end of the first voltage transforming unit 1014, and when the generator 1011 is in normal operation, the switch may control the connection or disconnection between the first end of the generator 1011, the first end of the first voltage transforming unit 1014, and the first end of the voltage boosting station 1013; under the condition that the generator 1011 does not normally operate, the generator 1011 can be disconnected with other equipment of the unit through a switch so as to protect the operation safety of the unit.
Optionally, as shown in fig. 2, the first transforming unit 1014 includes a second transformer 10141 and a third transformer 10142, a first end of the generator 1011 and a second end of the first transformer 1012 are connected to a first end of the second transformer 10141, and a first end of the generator 1011 and a second end of the first transformer 1012 are connected to a first end of the third transformer 10142;
a second terminal of the second transformer 10141 is connected to a first terminal of the fourth bus bar 1031, a third terminal of the second transformer 10141 is connected to a first terminal of the fifth bus bar 1032, a second terminal of the third transformer 10142 is connected to a first terminal of the sixth bus bar 1033, and a third terminal of the third transformer 10142 is connected to a first terminal of the seventh bus bar 1034.
Specifically, switches may be disposed between the bus bars and the connections of the second transformer 10141 and the third transformer 10142, and if the second transformer 10141 and the third transformer 10142 are repaired or failed, the switches may be controlled to be in a connected state or a disconnected state, so as to ensure safe operation of the unit.
Optionally, as shown in fig. 2, the power distribution system further includes an auxiliary power supply unit 50, the auxiliary power supply unit 50 includes an auxiliary switching station 51 and a second transforming unit 52, a first end of the auxiliary switching station 51 is connected to a first end of the second transforming unit 52, a second end of the second transforming unit 52 is connected to a third end of the fourth bus bar 1031, a third end of the second transforming unit 52 is connected to a third end of the fifth bus bar 1032, a fourth end of the second transforming unit 52 is connected to a second end of the sixth bus bar 1033, and a fifth end of the second transforming unit 52 is connected to a third end of the seventh bus bar 1034.
Specifically, the power distribution system may include a plurality of power supply methods, the power supply unit 101 may be a main power supply method, and when the power supply unit 101 is repaired or failed, the auxiliary power supply unit 50 may also supply power to the electric devices in the plant, and the 220kV auxiliary switching station 51 may transmit the electric energy of the power grid to the power distribution system, for example: in the power supply unit 101, when the generator 1011, the first transformer 1012, the booster 1013, and the like are repaired or failed, the auxiliary power supply unit 50 may supply power to the fourth bus 1031, the fifth bus 1032, the sixth bus 1033, and the seventh bus 1034, and further supply power to the second bus 1021 and the third bus 1022, respectively, so as to satisfy the power demand of the power distribution system.
In addition, the auxiliary power supply unit 50 can supply power to the seventh bus 1034, and can also ensure power supply to the first bus unit 20, thereby supplying power to the second bus unit 102 of another unit, and further improving reliability of the power distribution system.
Alternatively, as shown in fig. 2, the second transforming unit 52 includes a fourth transformer 521 and a fifth transformer 522, and the first end of the auxiliary switching station 51 is connected to the first end of the fourth transformer 521 and the first end of the fifth transformer 522;
a second end of the fourth transformer 521 is connected to a third end of the fourth bus 1031, a third end of the fourth transformer 521 is connected to a second end of the sixth bus 1033, a second end of the fifth transformer 522 is connected to a third end of the fifth bus 1032, and a third end of the fifth transformer 522 is connected to a third end of the seventh bus 1034.
It can be understood that the fourth transformer 521 and the fifth transformer 522 can be used as auxiliary transformers, and two branches are respectively branched to supply power to the third bus bar unit 103, so as to improve the economy of the power distribution system.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The utility model provides an electric distribution system, its characterized in that includes two at least units, first busbar unit and switch unit, every unit includes power supply unit, second busbar unit and third busbar unit, the first end of power supply unit is connected the first end of third busbar unit, the second end of third busbar unit is connected the first end of second busbar unit, the third end of third busbar unit is connected the first end of switch unit, the second end of switch unit is connected the first end of first busbar unit, the second end of first busbar unit is connected the second end of second busbar unit.
2. The power distribution system of claim 1, wherein the switch unit comprises at least two sub-switch units, the at least two sub-switch units are in one-to-one correspondence with the at least two units, a third end of the third bus bar unit in each unit is connected to a first end of the corresponding sub-switch unit, and a second end of the corresponding sub-switch unit is connected to a first end of the first bus bar unit.
3. The power distribution system of claim 1, wherein each unit further comprises a service power source, and wherein the third end of the first bus bar unit is connected to the first end of the service power source.
4. The power distribution system of claim 3, wherein the first bus bar unit comprises a first bus bar, the second bus bar unit comprises a second bus bar and a third bus bar, and the third bus bar unit comprises a fourth bus bar, a fifth bus bar, a sixth bus bar, and a seventh bus bar;
a first end of the power supply unit is connected with a first end of the fourth bus, a first end of the fifth bus, a first end of the sixth bus and a first end of the seventh bus, a second end of the fourth bus is connected with a first end of the second bus, a second end of the fifth bus is connected with a first end of the third bus, a second end of the seventh bus is connected with a first end of the switch unit, a second end of the switch unit is connected with a first end of the first bus, a second end of the first bus is connected with a second end of the second bus, and a third end of the first bus is connected with a second end of the third bus;
and the fourth end of the first bus is connected with the first end of the maintenance power supply.
5. The power distribution system of claim 4, wherein the power supply unit comprises a generator, a first transformer, a booster station, and a first transformer unit, wherein a first end of the booster station is connected to a first end of the first transformer, a first end of the generator and a second end of the first transformer are connected to a first end of the first transformer unit, and a first end of the generator is connected to a first end of the booster station;
the second end of the first voltage transformation unit is connected with the first end of the fourth bus, the third end of the first voltage transformation unit is connected with the first end of the fifth bus, the fourth end of the first voltage transformation unit is connected with the first end of the sixth bus, and the fifth end of the first voltage transformation unit is connected with the first end of the seventh bus.
6. The power distribution system of claim 5, wherein the first transforming unit includes a second transformer and a third transformer, the first terminal of the generator and the second terminal of the first transformer are connected to the first terminal of the second transformer, the first terminal of the generator and the second terminal of the first transformer are connected to the first terminal of the third transformer;
the second end of the second transformer is connected with the first end of the fourth bus, the third end of the second transformer is connected with the first end of the fifth bus, the second end of the third transformer is connected with the first end of the sixth bus, and the third end of the third transformer is connected with the first end of the seventh bus.
7. The power distribution system of claim 4, further comprising an auxiliary power supply unit, wherein the auxiliary power supply unit comprises an auxiliary switchyard and a second transformation unit, a first end of the auxiliary switchyard is connected to a first end of the second transformation unit, a second end of the second transformation unit is connected to a third end of the fourth bus, a third end of the second transformation unit is connected to a third end of the fifth bus, a fourth end of the second transformation unit is connected to a second end of the sixth bus, and a fifth end of the second transformation unit is connected to a third end of the seventh bus.
8. The power distribution system of claim 7, wherein the second transformation unit includes a fourth transformer and a fifth transformer, the first end of the auxiliary switchyard connected to the first end of the fourth transformer and the first end of the fifth transformer;
the second end of the fourth transformer is connected with the third end of the fourth bus, the third end of the fourth transformer is connected with the second end of the sixth bus, the second end of the fifth transformer is connected with the third end of the fifth bus, and the third end of the fifth transformer is connected with the third end of the seventh bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120891261.2U CN214479622U (en) | 2021-04-27 | 2021-04-27 | Power distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120891261.2U CN214479622U (en) | 2021-04-27 | 2021-04-27 | Power distribution system |
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| Publication Number | Publication Date |
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| CN214479622U true CN214479622U (en) | 2021-10-22 |
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| CN202120891261.2U Active CN214479622U (en) | 2021-04-27 | 2021-04-27 | Power distribution system |
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| CN (1) | CN214479622U (en) |
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- 2021-04-27 CN CN202120891261.2U patent/CN214479622U/en active Active
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