CN216721001U - Power supply system of auxiliary safety power supply of nuclear power station - Google Patents
Power supply system of auxiliary safety power supply of nuclear power station Download PDFInfo
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- CN216721001U CN216721001U CN202122904064.2U CN202122904064U CN216721001U CN 216721001 U CN216721001 U CN 216721001U CN 202122904064 U CN202122904064 U CN 202122904064U CN 216721001 U CN216721001 U CN 216721001U
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Abstract
The utility model relates to a power supply system of an auxiliary safety power supply of a nuclear power station, which comprises: the system comprises a plurality of auxiliary transformers arranged corresponding to a nuclear power station unit, a plurality of inlet wire modules arranged corresponding to the auxiliary transformers, a hot standby leading-in module and a hot standby transformer; the output end of each auxiliary transformer is connected into the corresponding nuclear power station unit through the corresponding inlet wire module so as to provide auxiliary safe external power for the corresponding nuclear power station unit; the input end of the hot standby leading-in module is connected with the hot standby transformer, and the output end of the hot standby leading-in module is correspondingly connected with the plurality of incoming line modules respectively; and the hot standby transformer provides auxiliary power supply for the nuclear power station unit to be powered when any one or more auxiliary transformers have faults or are maintained and stopped. When the auxiliary transformer fails or is overhauled, the hot standby auxiliary transformer can directly supply power, so that the reliability of the auxiliary safe external power supply is improved, and the normal operation of the nuclear power unit is ensured.
Description
Technical Field
The utility model relates to the technical field of electricity and nuclear power, in particular to an auxiliary safety power supply system of a nuclear power station.
Background
At present, the structure of an auxiliary safe external power supply of a CPR1000 unit (and other nuclear power unit models) is that 2 auxiliary transformers (hereinafter referred to as auxiliary transformers) provide auxiliary external power for 2 nuclear power units together, and a single 1 auxiliary transformer cannot provide auxiliary external power for 1 unit.
According to the current CPR1000 unit (and other nuclear power unit models) 'operating specifications', when an auxiliary variable is not available due to tripping, failure, etc. 'a unit should start to fallback to NS/RRA mode within 24 hours, and the start fallback period can be extended to 7 days if an additional diesel generator is available and there is no other first set of events', during which the unit 101 is recorded.
If the auxiliary transformer internal fault, the GIS insulation fault, the sleeve pipe fault and other events occur, the auxiliary safety external power supply cannot be recovered to be usable within 7 days, and adverse effects are caused on the unit availability. In addition, in overhaul, the planned overhaul period of the auxiliary transformer is only 2-5 days generally, the overhaul period of the transformer is very short, the transformer can only be used for routine inspection and test, and if the work of replacing GIS components (such as a lightning arrester), replacing the transformer, replacing an auxiliary transformer sleeve, a transformer sealing gasket, filtering oil of a body and the like is met, the planned period can be broken through to influence the overhaul period and influence the availability ratio of a nuclear power unit.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a power supply system of an auxiliary safety power supply of a nuclear power station aiming at the defects in the prior art.
The technical scheme adopted by the utility model for solving the technical problems is as follows: constructing a power supply system of an auxiliary safety power supply of a nuclear power station, comprising: the system comprises a plurality of auxiliary transformers arranged corresponding to a nuclear power station unit, a plurality of inlet wire modules arranged corresponding to the auxiliary transformers, a hot standby leading-in module and a hot standby transformer;
the output end of each auxiliary transformer is connected into the corresponding nuclear power plant unit through the corresponding inlet wire module to provide auxiliary safe external power for the corresponding nuclear power plant unit;
the input end of the hot standby leading-in module is connected with the hot standby transformer, and the output end of the hot standby leading-in module is correspondingly connected with the plurality of incoming line modules respectively;
the hot standby transformer is used for providing auxiliary power supply for the nuclear power station unit to be powered through the hot standby leading-in module when any one or more auxiliary transformers have faults or are maintained and stopped; and the nuclear power station unit to be powered is a unit corresponding to the auxiliary transformer which is in fault or is in maintenance and outage.
In the power supply system of the nuclear power plant auxiliary safety power supply of the present invention, each of the incoming line modules includes: an inlet switch and a switchboard;
the first end of the incoming line switch is connected with the corresponding auxiliary transformer, and the second end of the incoming line switch is connected with the switchboard.
In the power supply system of the nuclear power station auxiliary safety power supply of the present invention, the incoming line switch includes: a circuit breaker.
In the power supply system of the auxiliary safety power supply of the nuclear power station, the hot standby import module includes: a plurality of access modules and signal distribution modules;
each access module is respectively arranged corresponding to the two incoming line modules;
the signal distribution module is respectively connected with the plurality of incoming line modules through the plurality of access modules.
In the power supply system of the nuclear power station auxiliary safety power supply, each access module comprises: the first bus coupler switch, the second bus coupler switch and the access switch;
the first end of the first female switch that allies oneself with is connected with an inlet wire module in two inlet wire modules that correspond the setting, the first end of the second female switch that allies oneself with correspond another inlet wire module in two inlet wire modules that set up and be connected, the second end of the first female switch that allies oneself with the second end short circuit of the second female switch that allies oneself with is connected to the first end of access switch, the second end of access switch with signal distribution module connects.
In the power supply system of the auxiliary safety power supply of the nuclear power station, the first bus coupler switch, the second bus coupler switch and the access switch are all circuit breakers.
In the power supply system of the nuclear power station auxiliary safety power supply, the signal distribution module is a medium-voltage distribution system.
The power supply system of the auxiliary safety power supply of the nuclear power station further comprises: a hot standby switch;
the first end of the hot standby switch is connected with the medium-voltage distribution system, and the second end of the hot standby switch is connected with the hot standby transformer.
In the power supply system of the auxiliary safety power supply of the nuclear power station, the hot standby switch is a circuit breaker.
The power supply system of the auxiliary safety power supply of the nuclear power station has the following beneficial effects: the method comprises the following steps: the system comprises a plurality of auxiliary transformers arranged corresponding to a nuclear power station unit, a plurality of inlet wire modules arranged corresponding to the auxiliary transformers, a hot standby leading-in module and a hot standby transformer; the output end of each auxiliary transformer is connected into the corresponding nuclear power station unit through the corresponding inlet wire module so as to provide auxiliary safe external power for the corresponding nuclear power station unit; the input end of the hot standby leading-in module is connected with the hot standby transformer, and the output end of the hot standby leading-in module is correspondingly connected with the plurality of wire inlet modules respectively; and the hot standby transformer provides auxiliary power supply for the nuclear power station unit to be powered when any one or more auxiliary transformers have faults or are maintained and stopped. When the auxiliary transformer fails or is overhauled, the hot standby auxiliary transformer can directly supply power, so that the reliability of the auxiliary safe external power supply is improved, and the normal operation of the nuclear power unit is ensured.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic block diagram of a power supply system of an auxiliary safety power supply of a nuclear power plant according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a first embodiment of a power supply system of an auxiliary safety power supply of a nuclear power plant provided by the utility model;
FIG. 3 is a circuit diagram of a second embodiment of the power supply system of the auxiliary safety power supply of the nuclear power plant provided by the utility model;
fig. 4 is a circuit diagram of a third embodiment of the power supply system of the auxiliary safety power supply of the nuclear power plant provided by the utility model.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a schematic block diagram of an alternative embodiment of a power supply system of an auxiliary safety power supply of a nuclear power plant according to the present invention is shown.
Specifically, as shown in fig. 1, the power supply system of the auxiliary safety power supply of the nuclear power station includes: the system comprises a plurality of auxiliary transformers 10 corresponding to the nuclear power plant units, a plurality of inlet wire modules 20 corresponding to the auxiliary transformers 10, a hot standby leading-in module 30 and a hot standby transformer 40.
In the embodiment of the utility model, the output end of each auxiliary transformer is connected into the corresponding nuclear power plant unit through the corresponding inlet wire module so as to provide auxiliary safe external power for the corresponding nuclear power plant unit. The input end of the hot standby import module 30 is connected with the hot standby transformer 40, and the output end of the hot standby import module 30 is correspondingly connected with the plurality of incoming line modules 20. The hot standby transformer 40 is used for providing auxiliary power supply for the nuclear power plant unit to be powered through the hot standby leading-in module 30 when any one or more of the auxiliary transformers 10 fails or is in maintenance outage. The nuclear power station unit to be powered is a unit corresponding to the auxiliary transformer which is in fault or in maintenance and outage.
In some embodiments, each incoming line module comprises: an inlet switch and a switchboard; the first end of the incoming line switch is connected with the corresponding auxiliary transformer, and the second end of the incoming line switch is connected with the switchboard.
Optionally, in an embodiment of the present invention, the incoming line switch includes: a circuit breaker. It can be understood that, since each auxiliary transformer of the embodiment of the present invention provides high voltage of 220KV, the incoming line switch needs to adopt a high-power switch, and thus, by adopting the circuit breaker, the reliability and stability of the power supply system can be ensured. Of course, it can be understood that the incoming line switch of the embodiment of the present invention may also adopt other high-power switches, and is not limited to a circuit breaker, as long as the voltage withstand requirement of the 220KV high-voltage power can be met.
In some embodiments, hot standby import module 30 includes: a plurality of access modules and a signal distribution module. Wherein, every inserts the module and corresponds the setting with two inlet wire modules respectively. The signal distribution module is connected to the plurality of incoming modules 20 via a plurality of access modules, respectively.
In some embodiments, each access module comprises: the first bus coupler switch, the second bus coupler switch and the access switch.
The first end of the first bus-coupled switch is connected with one of the two inlet wire modules which are correspondingly arranged, the first end of the second bus-coupled switch is connected with the other inlet wire module which is correspondingly arranged in the two inlet wire modules, the second end of the first bus-coupled switch and the second end of the second bus-coupled switch are in short circuit connection with the first end of the access switch, and the second end of the access switch is connected with the signal distribution module.
Optionally, in the embodiment of the present invention, the first buscouple switch, the second buscouple switch, and the access switch are all circuit breakers. It can be understood that, since the hot standby transformer 40 of the embodiment of the present invention provides the high voltage of 220KV, the first buscouple switch, the second buscouple switch, and the access switch all need to adopt high-power switches, and therefore, by adopting the circuit breaker, the reliability and stability of the power supply system can be ensured. Of course, it can be understood that the first buscouple switch, the second buscouple switch, and the access switch of the embodiment of the present invention may also adopt other high-power switches, and are not limited to the circuit breaker, as long as the requirement of withstand voltage of 220KV high-voltage power can be met.
Optionally, in the embodiment of the present invention, the signal distribution module is a medium voltage distribution system. Through setting up this medium voltage distribution system, can reduce 50% construction cost and degree of difficulty.
In addition, in the embodiment of the utility model, for nuclear power bases with a plurality of units, such as 4 units, 6 units, 2 units and the like, hot standby replacement can be realized only by adding one hot standby transformer 40, and the economic cost can be effectively reduced.
Further, in some embodiments, as shown in fig. 1, the power supply system of the nuclear power plant auxiliary safety power supply further includes: hot standby switch 50. A first terminal of the hot standby switch 50 is connected to the medium voltage distribution system and a second terminal of the hot standby switch 50 is connected to the hot standby transformer 40.
Alternatively, it can be understood that, since the hot standby transformer 40 of the embodiment of the present invention provides the high voltage of 220KV, the hot standby switch 50 needs to adopt a high-power switch, and thus, by adopting the circuit breaker, the reliability and stability of the power supply system can be ensured. Of course, it is understood that the hot standby switch 50 of the embodiment of the present invention may also be other high power switches, and is not limited to a circuit breaker, as long as the voltage withstanding requirement of the 220KV high voltage can be satisfied. The hot standby switch 50 is a circuit breaker.
Referring to fig. 2, a circuit diagram of a first embodiment of a power supply system of an auxiliary safety power supply of a nuclear power plant according to the present invention is shown.
As shown in fig. 2, in this embodiment, the nuclear power base has 6 units (respectively #1 unit, #2 unit, #3 unit, #4 unit, #5 unit, and #6 unit), and therefore, the auxiliary safety power supply system of the nuclear power station may be provided with 6 auxiliary transformers (respectively #1 auxiliary transformer, #2 auxiliary transformer, #3 auxiliary transformer, #4 auxiliary transformer, #5 auxiliary transformer, and #6 auxiliary transformer), where the #1 auxiliary transformer, #2 auxiliary transformer, #3 auxiliary transformer, #4 auxiliary transformer, #5 auxiliary transformer, and #6 auxiliary transformer correspond to the #1 unit, #2 unit, #3 unit, #4 unit, #5 unit, and #6 unit, respectively. Simultaneously, correspondingly, the wiring module can set up 6 wiring modules, specifically includes: a #1 wiring module, a #2 wiring module, a #3 wiring module, a #4 wiring module, a #5 wiring module and a #6 wiring module; the #1 wiring module, #2 wiring module, #3 wiring module, #4 wiring module, #5 wiring module, and #6 wiring module correspond to the #1 auxiliary transformer, #2 auxiliary transformer, #3 auxiliary transformer, #4 auxiliary transformer, #5 auxiliary transformer, and #6 auxiliary transformer, respectively. Correspondingly, the hot standby import module 30 may be provided with 3 access modules. The method specifically comprises the following steps: a first access module 301, a second access module 302, a third access module 303. The first access module 301 corresponds to a #1 wiring module and a #2 wiring module, the second access module 302 corresponds to a #3 wiring module and a #4 wiring module, and the third access module 303 corresponds to a #5 wiring module and a #6 wiring module.
As shown in fig. 2, the #1 wiring module includes: an incoming switch A and a switchboard 9LGJ A section; #2 junction module includes: an incoming switch B and a switchboard GLGJ B section; #3 junction module includes: an incoming switch C and a switchboard 8LGJ A section; the #4 junction module includes: an inlet switch D and a switchboard 8LGJ B section; the #5 junction module includes: an incoming switch E and a switchboard 7LGJ A section; the #6 junction module includes: an inlet switch F and a switchboard 7LGJ B section.
The first access module 301 includes: the first bus coupler switch a (i.e. the first bus coupler switch), the second bus coupler switch B (i.e. the second bus coupler switch) and the first access switch K1 (i.e. the access switch). The second access module 302 includes: a bus coupler switch C (i.e. a first bus coupler switch), a bus coupler switch D (i.e. a second bus coupler switch), and a second access switch K2 (i.e. an access switch). The third access module 303 includes: a bus tie switch E (i.e., a first bus tie switch), a bus tie switch F (i.e., a second bus tie switch), and a third access switch K3 (i.e., an access switch).
As shown in fig. 2, the hot standby switch 50 includes: the circuit breakers K4, #7 auxiliary transformer are hot standby transformers 40.
As shown in fig. 2, the #1 auxiliary transformer is connected to the LGJ a section of the switchboard 9 through the incoming switch a; #2 auxiliary transformer accesses panel 9LGJ B segment through inlet switch B; #3 auxiliary transformer accesses 8LGJ A sections of the switchboard through the incoming switch C; the #4 auxiliary transformer is connected to the LGJ B section of the switchboard 8 through an incoming switch D; the #5 auxiliary transformer is connected to the 7LGJ A section of the switchboard through an incoming switch E; and the #6 auxiliary transformer is connected to the 7LGJ B section of the switchboard through an incoming switch F.
The first end of the bus-coupled switch A is connected with the LGJ A section of the distribution board 9, and the second end of the bus-coupled switch A is connected with a medium-voltage distribution system through a first access switch K1; the first end of the bus-coupled switch B is connected with the LGJ B section of the distribution board 9, and the second end of the bus-coupled switch B is connected with a medium-voltage distribution system through a first access switch K1; the first end of the bus-coupled switch C is connected with the LGJ A section of the distribution board 8, and the second end of the bus-coupled switch C is connected with a medium-voltage distribution system through a second access switch K2; the first end of the bus-coupled switch D is connected with the LGJ B section of the distribution board 8, and the second end of the bus-coupled switch D is connected with a medium-voltage distribution system through a second access switch K2; the first end of the bus-coupled switch E is connected with the section 7LGJ A of the distribution board, and the second end of the bus-coupled switch E is connected with a medium-voltage distribution system through a third access switch K3; the first end of the bus-coupled switch F is connected with the section of the switchboard 7LGJ B, and the second end of the bus-coupled switch F is connected with the medium-voltage distribution system through a third access switch K3.
As shown in fig. 2, the hot standby transformer 40 is connected to the medium voltage distribution system through a circuit breaker K4.
Specifically, when the auxiliary transformer normally operates, the inlet switch a, the inlet switch B, the inlet switch C, the inlet switch D, the inlet switch E and the inlet switch F are all in a closed state, the bus-coupled switch a, the bus-coupled switch B, the bus-coupled switch C, the bus-coupled switch D, the bus-coupled switch E and the bus-coupled switch F are all in an open state, and the first access switch K1, the second access switch K2, the third access switch K3 and the circuit breaker K4 are all in an open state. At the moment, the #1 auxiliary transformer provides auxiliary safe external power for the #1 unit through the incoming switch A and the LGJ A section of the switchboard 9 in sequence; the #2 auxiliary transformer provides auxiliary safe external power for the #2 unit through an inlet switch B and a switchboard 9LGJ B section in sequence; the #3 auxiliary transformer provides auxiliary safe external power for the #3 unit through the inlet switch C and the LGJ A section of the switchboard 8; the #4 auxiliary transformer provides auxiliary safe external power for the #4 unit through the incoming switch D and the section LGJ B of the switchboard 8; the #5 auxiliary transformer provides auxiliary safe external power for the #5 unit through the incoming switch E and the 7LGJ A section of the switchboard in sequence; and the #6 auxiliary transformer provides auxiliary safe external power for the #6 unit through the incoming switch F and the 7LGJ B section of the switchboard in sequence.
When any one or more of the #1 auxiliary transformer, #2 auxiliary transformer, #3 auxiliary transformer, #4 auxiliary transformer, #5 auxiliary transformer and #6 auxiliary transformer is abnormal or is repaired or stopped running, the hot standby transformer 40 provides auxiliary safe external power for the corresponding unit.
For example, a #1 auxiliary transformer failure will be described as an example.
(1) When the auxiliary transformer # 1 fails, the incoming line switch A is disconnected;
(2) the disconnection of the bus tie switch B (the bus tie switch B itself is already in the disconnected state) is confirmed, and this action is to ensure that no malfunction occurs.
(3) The bus tie switch A is controlled to be closed, and the first access switch K1 and the breaker K4 are controlled to be closed at the same time.
After the steps (1) to (3) are completed, at this time, the hot standby transformer 40 supplies power to the distribution board 9LGJ a section through the medium voltage distribution system (OLGJ), the circuit breaker K4, the first access switch K1 and the bus tie switch a, and supplies power to the #1 unit through the distribution board 9LGJ a section, so that an auxiliary safe external power supply is provided to the #1 unit instead of the #1 auxiliary transformer.
When the fault of the #1 auxiliary transformer is eliminated or repaired:
(4) controlling the first access switch K1, the breaker K4 and the bus tie switch A to be opened;
(5) and controlling the incoming line switch A to be closed.
After the steps (4) and (5) are completed, at this time, the #1 auxiliary transformer is recovered to be available, the 9LGJ a section is supplied with power through the incoming switch a, the #1 auxiliary transformer replaces the hot standby transformer 40 to provide auxiliary safe external power for the #1 unit, and the hot standby transformer 40 is recovered to the hot standby state (i.e., the charged state, but the external output is not performed).
Similarly, when other auxiliary transformers break down or are repaired and stopped, the working principle is the same as that when the #1 auxiliary transformer breaks down or is repaired and stopped.
Referring to fig. 3, a circuit diagram of a second embodiment of the power supply system of the nuclear power plant auxiliary safety power supply according to the present invention is shown.
As shown in fig. 3, in this embodiment, the nuclear power base has 2 units (a #1 unit and a #2 unit, respectively), and correspondingly, the auxiliary safety power supply system of the nuclear power plant may have 2 auxiliary transformers (a #1 auxiliary transformer and a #2 auxiliary transformer, respectively), where the #1 auxiliary transformer corresponds to the #1 unit and the #2 auxiliary transformer corresponds to the #2 unit. Simultaneously, correspondingly, wiring module can set up 2 wiring modules, specifically includes: the transformer comprises a #1 wiring module and a #2 wiring module, wherein the #1 wiring module corresponds to a #1 auxiliary transformer, and the #2 wiring module corresponds to a # auxiliary transformer. Correspondingly, the hot standby import module 30 may be provided with 1 access module, which specifically includes: a first access module 301.
As shown in fig. 3, the #1 junction module includes: an incoming switch A and a switchboard 9LGJ A section; the #2 junction module includes: inlet switch B and switchboard 9LGJ B section.
The first access module 301 includes: the first bus coupler switch a (i.e. the first bus coupler switch), the second bus coupler switch B (i.e. the second bus coupler switch) and the first access switch K1 (i.e. the access switch). The hot standby switch 50 includes: breaker K4.
As shown in fig. 3, #1 auxiliary transformer is connected to the switchboard 9LGJ a section through the inlet switch a; #2 auxiliary transformer accesses panel 9LGJ B section through service switch B. The hot standby transformer 40 is connected with the medium-voltage distribution system through a circuit breaker K4, the first end of the bus coupler switch A is connected with the LGJ A section of the distribution board 9, the second end of the bus coupler switch A and the second end of the bus coupler switch B are connected with the medium-voltage distribution system through a first access switch K1, and the first end of the bus coupler switch B is connected with the LGJ B section of the distribution board 9.
Specifically, when the auxiliary transformer normally operates, the incoming line switch a and the incoming line switch B are both in a closed state, and the bus coupler switch a, the bus coupler switch B, the first access switch K1 and the circuit breaker K4 are all in an open state. At the moment, the #1 auxiliary transformer provides auxiliary safe external power for the #1 unit through an incoming switch A and a switchboard 9LGJ A section in sequence; and the #2 auxiliary transformer provides auxiliary safe external power for the #2 unit through the incoming switch B and the LGJ B section of the switchboard 9 in sequence.
When the #1 auxiliary transformer and/or the #2 auxiliary transformer fails or is out of service, auxiliary safe external power is provided to the corresponding unit by the hot standby transformer 40.
For example, a #1 auxiliary transformer failure will be described as an example.
(1) When the auxiliary transformer # 1 fails, the incoming line switch A is disconnected;
(2) the disconnection of the bus tie switch B (the bus tie switch B itself is already in the disconnected state) is confirmed, and this action is to ensure that no malfunction occurs.
(3) The bus tie switch A is controlled to be closed, and the first access switch K1 and the breaker K4 are controlled to be closed at the same time.
After the steps (1) to (3) are completed, at this time, the hot standby transformer 40 supplies power to the distribution board 9LGJ a section through the medium voltage distribution system (OLGJ), the circuit breaker K4, the first access switch K1 and the bus tie switch a, and supplies power to the #1 unit through the distribution board 9LGJ a section, so that an auxiliary safe external power supply is provided to the #1 unit instead of the #1 auxiliary transformer.
When the fault of the #1 auxiliary transformer is eliminated or repaired:
(4) controlling the first access switch K1, the breaker K4 and the bus tie switch A to be opened;
(5) and controlling the incoming line switch A to be closed.
After the steps (4) and (5) are completed, at this time, the #1 auxiliary transformer is recovered to be available, the 9LGJ a section is supplied with power through the incoming switch a, the #1 auxiliary transformer replaces the hot standby transformer 40 to provide auxiliary safe external power for the #1 unit, and the hot standby transformer 40 is recovered to the hot standby state (i.e., the charged state, but the external output is not performed).
Similarly, when the #2 auxiliary transformer fails or is in maintenance outage, the working principle is the same as that when the #1 auxiliary transformer fails or is in maintenance outage.
Referring to fig. 4, a circuit diagram of a third embodiment of the power supply system of the nuclear power plant auxiliary safety power supply provided by the present invention is shown.
As shown in fig. 3, in this embodiment, the nuclear power base has 4 units (respectively #1 unit, #2 unit, #3 unit, #4 unit), and correspondingly, the auxiliary safety power supply system of the nuclear power station may have 4 auxiliary transformers (respectively #1 auxiliary transformer, #2 auxiliary transformer, #3 auxiliary transformer, and #4 auxiliary transformer), where #1 auxiliary transformer corresponds to #1 unit, #2 auxiliary transformer corresponds to #2 unit, #3 auxiliary transformer corresponds to #1 unit, and #4 auxiliary transformer corresponds to #1 unit. Simultaneously, correspondingly, wiring module can set up 4 wiring modules, specifically includes: the transformer comprises a #1 wiring module, a #2 wiring module, a #3 wiring module and a #4 wiring module, wherein the #1 wiring module corresponds to a #1 auxiliary transformer, the #2 wiring module corresponds to a # auxiliary transformer, the #3 wiring module corresponds to a # auxiliary transformer, and the #4 wiring module corresponds to a # auxiliary transformer. Correspondingly, the hot standby import module 30 may be provided with 2 access modules, which specifically include: a first access module 301 and a second access module 302.
As shown in fig. 4, the #1 wiring module includes: an incoming switch A and a switchboard 9LGJ A section; #2 junction module includes: an incoming switch B and a switchboard 9LGJ B section; #3 junction module includes: an incoming switch C and a switchboard 8LGJ A section; the #4 junction module includes: an inlet switch D and a switchboard 8LGJ A section.
The first access module 301 includes: the first bus coupler switch a (i.e. the first bus coupler switch), the second bus coupler switch B (i.e. the second bus coupler switch) and the first access switch K1 (i.e. the access switch). The second access module 302 includes: a bus coupler switch C (i.e., a first bus coupler switch), a bus coupler switch D (i.e., a second bus coupler switch), and a second access switch K1 (i.e., an access switch). The hot standby switch 50 includes: breaker K4.
As shown in fig. 4, the #1 auxiliary transformer is connected to the LGJ a section of the switchboard 9 through the incoming switch a; #2 auxiliary transformer accesses panel 9LGJ B segment through inlet switch B; #3 auxiliary transformer accesses 8LGJ A sections of the switchboard through the incoming switch C; and the #4 auxiliary transformer is connected to the LGJ A section of the switchboard 8 through an inlet switch D.
The hot standby transformer 40 is connected with the medium-voltage distribution system through a circuit breaker K4, the first end of the bus coupler switch A is connected with the LGJ A section of the distribution board 9, the second end of the bus coupler switch A and the second end of the bus coupler switch B are connected with the medium-voltage distribution system through a first access switch K1, and the first end of the bus coupler switch B is connected with the LGJ B section of the distribution board 9. The first end of the bus coupler switch C is connected with an 8LGJ A section of the distribution board, the first end of the bus coupler switch D is connected with an 8LGJ B section of the distribution board, and the second end of the bus coupler switch C and the second end of the bus coupler switch D are connected with a medium-voltage distribution system through a second access switch K2.
Specifically, when the auxiliary transformer normally operates, the incoming line switch a, the incoming line switch B, the incoming line switch C and the incoming line switch D are all in a closed state, and the bus coupler switch a, the bus coupler switch B, the bus coupler switch C, the bus coupler switch D, the first access switch K1, the second access switch K2 and the circuit breaker K4 are all in an open state. At the moment, the #1 auxiliary transformer provides auxiliary safe external power for the #1 unit through the incoming switch A and the LGJ A section of the switchboard 9 in sequence; the #2 auxiliary transformer provides auxiliary safe external power for the #2 unit through the incoming switch B and the LGJ B section of the switchboard 9 in sequence; the #3 auxiliary transformer provides auxiliary safe external power for the #3 unit through the inlet switch C and the section 8LGJ A of the switchboard in sequence; and the #4 auxiliary transformer provides auxiliary safe external power for the #4 unit through the incoming switch D and the section 8LGJ B of the switchboard in sequence.
When any one or more of the # auxiliary transformer, #2 auxiliary transformer, #3 auxiliary transformer and #4 auxiliary transformer fails or is out of service for repair, auxiliary safety external power is provided to the corresponding unit by the hot standby transformer 40.
For example, a #1 auxiliary transformer failure will be described as an example.
(1) When the auxiliary transformer # 1 fails, the incoming line switch A is disconnected;
(2) the disconnection of the bus tie switch B (the bus tie switch B itself is already in the disconnected state) is confirmed, and this action is to ensure that no malfunction occurs.
(3) The bus tie switch A is controlled to be closed, and the first access switch K1 and the breaker K4 are controlled to be closed at the same time.
After the steps (1) to (3) are completed, at this time, the hot standby transformer 40 supplies power to the distribution board 9LGJ a section through the medium voltage distribution system (OLGJ), the circuit breaker K4, the first access switch K1 and the bus tie switch a, and supplies power to the #1 unit through the distribution board 9LGJ a section, so that an auxiliary safe external power supply is provided to the #1 unit instead of the #1 auxiliary transformer.
When the fault of the #1 auxiliary transformer is eliminated or repaired:
(4) controlling the first access switch K1, the breaker K4 and the bus tie switch A to be opened;
(5) and controlling the incoming line switch A to be closed.
After the steps (4) and (5) are completed, at this time, the #1 auxiliary transformer is recovered to be available, the 9LGJ a section is supplied with power through the incoming switch a, the #1 auxiliary transformer replaces the hot standby transformer 40 to provide auxiliary safe external power for the #1 unit, and the hot standby transformer 40 is recovered to the hot standby state (i.e., the charged state, but the external output is not performed).
Similarly, when other auxiliary transformers break down or are overhauled and shut down, the working principle is the same as that of the auxiliary transformer # 1 when the auxiliary transformer breaks down or is overhauled and shut down.
The utility model can immediately replace the auxiliary transformer when the auxiliary transformer fails or is overhauled and stopped by adding the hot standby transformer 40 and the corresponding switch structure, thereby improving the reliability of the auxiliary safe external power supply, and for a multi-unit nuclear power base, the utility model can realize the replacement function only by adding the hot standby transformer 40, and has low cost. In addition, by adding the access of the medium-voltage distribution system and the bus coupler switch, the construction cost and the construction difficulty can be reduced by at least 50%.
Further, the auxiliary safety external power source is used as a priority power source of the nuclear power station, the auxiliary safety external power source needs to be kept in an available state in the RP mode, and when the auxiliary transformer is unavailable due to tripping, faults and the like, the unit needs to be withdrawn to the NS/RRA mode within 24 hours. According to the utility model, the hot standby transformer 40 is additionally arranged to be used as a standby for the auxiliary transformers of the whole plant, and when any one or more auxiliary transformers 10 are withdrawn, switching can be immediately carried out to complete replacement. The normal operation of the unit is ensured, and the operation safety of a nuclear power unit system is improved.
Further, the planned overhaul period of the auxiliary transformer during overhaul is typically only 2-5 days, for which only routine inspections and tests can be performed. If equipment defects occur, such as oil drainage (more than 4 days) and other work, the overhaul period is challenged. According to the utility model, the hot standby transformer 40 is additionally arranged to realize a replacement function, and then the rest auxiliary transformers can be arranged in daily maintenance, so that the overhaul period can be greatly saved. The preliminary evaluation can save the construction period for overhaul of each unit for at least 15 days within 10 years.
In addition, for the nuclear power base provided with 2 units, 2 spare auxiliary transformers are configured, and after one spare auxiliary transformer is designed and implemented according to the hot spare transformer 40 of the utility model, the configured 2 spare auxiliary transformers can form a hot spare state and a cold spare state, so that the auxiliary power supply has higher operation flexibility.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (9)
1. A nuclear power plant auxiliary safety power supply system is characterized by comprising: the system comprises a plurality of auxiliary transformers arranged corresponding to a nuclear power station unit, a plurality of inlet wire modules arranged corresponding to the auxiliary transformers, a hot standby leading-in module and a hot standby transformer;
the output end of each auxiliary transformer is connected into the corresponding nuclear power station unit through the corresponding inlet wire module to provide auxiliary safe external power for the corresponding nuclear power station unit;
the input end of the hot standby leading-in module is connected with the hot standby transformer, and the output end of the hot standby leading-in module is correspondingly connected with the plurality of inlet wire modules respectively.
2. The system of claim 1, wherein each of the incoming line modules comprises: an inlet switch and a switchboard;
the first end of the incoming line switch is connected with the corresponding auxiliary transformer, and the second end of the incoming line switch is connected with the switchboard.
3. The system of claim 2, wherein the inlet switch comprises: a circuit breaker.
4. The system of claim 2, wherein the hot standby import module comprises: a plurality of access modules and a signal distribution module;
each access module is respectively arranged corresponding to the two incoming line modules;
the signal distribution module is respectively connected with the plurality of incoming line modules through the plurality of access modules.
5. The system of claim 4, wherein each access module comprises: the first bus coupler switch, the second bus coupler switch and the access switch;
the first end of the first female switch is connected with one of the two inlet wire modules correspondingly arranged, the first end of the second female switch is connected with the other inlet wire module correspondingly arranged, the second end of the first female switch is in short circuit with the second end of the second female switch and is connected to the first end of the access switch, and the second end of the access switch is connected with the signal distribution module.
6. The nuclear power plant auxiliary safety power supply system of claim 5, wherein the first buscouple switch, the second buscouple switch and the access switch are circuit breakers.
7. The system as claimed in any one of claims 4 to 6, wherein the signal distribution module is a medium voltage distribution system.
8. The system of claim 7, further comprising: a hot standby switch;
the first end of the hot standby switch is connected with the medium-voltage distribution system, and the second end of the hot standby switch is connected with the hot standby transformer.
9. The electrical power supply system of an auxiliary safety power source of a nuclear power plant as claimed in claim 8, wherein the hot standby switch is a circuit breaker.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122904064.2U CN216721001U (en) | 2021-11-19 | 2021-11-19 | Power supply system of auxiliary safety power supply of nuclear power station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122904064.2U CN216721001U (en) | 2021-11-19 | 2021-11-19 | Power supply system of auxiliary safety power supply of nuclear power station |
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| CN202122904064.2U Active CN216721001U (en) | 2021-11-19 | 2021-11-19 | Power supply system of auxiliary safety power supply of nuclear power station |
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