CN117134301A

CN117134301A - Nuclear power station system wiring scheme

Info

Publication number: CN117134301A
Application number: CN202210553461.6A
Authority: CN
Inventors: 魏巍; 张瑞萍; 刘爱芬
Original assignee: Hualong International Nuclear Power Technology Co Ltd
Current assignee: Hualong International Nuclear Power Technology Co Ltd
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2023-11-28

Abstract

The invention provides a nuclear power station system wiring scheme, which comprises the following steps: the output end of the first generator of the nuclear power station is connected with the input end of the first equipment set through a first switch, and the output end of the first equipment set is connected with the input end of the second equipment set through a second switch; the output end of the first transformer is provided with a first current transformer, and is connected with the input end of the first equipment set through a third switch, and is connected with the input end of the second equipment set through a fourth switch. In the embodiment, the loop test of the first transformer is performed by detaching the second equipment set, the second switch and the third switch are set to be in an open state, the first switch and the fourth switch are set to be in a closed state for testing, and whether the loop of the first transformer has a phase failure or not can be effectively detected through the second equipment set.

Description

Nuclear power station system wiring scheme

Technical Field

The invention relates to the technical field of nuclear power, in particular to a nuclear power station system wiring scheme.

Background

The nuclear power station has higher safety level, and more plant equipment in the nuclear power station needs long-term power supply. When the nuclear power station normally operates, power is supplied to the in-plant equipment through the generator of the nuclear power station, and when the generator bus is out of power, the power is switched to an out-of-plant auxiliary power supply to supply power to the in-plant equipment, so that safe shutdown is ensured. The auxiliary transformer is in an empty load state when the nuclear power station normally operates, the open-phase fault of an external auxiliary power circuit is difficult to detect through existing equipment, and only daily inspection and investigation can be carried out through operation and maintenance personnel. However, the daily inspection has the possibility of human error, and the open-phase fault cannot be found timely, so that the safety of related systems of the auxiliary transformer is low.

As can be seen, the related art has a problem that the safety of the related system of the auxiliary transformer is low.

Disclosure of Invention

The embodiment of the invention provides a wiring scheme of a nuclear power station system, which aims to solve the problem that related systems of auxiliary transformers in related technologies are low in safety.

To achieve the above object, an embodiment of the present invention provides a system wiring scheme for a nuclear power station, including: a first generator, a first equipment set, a second equipment set, a first transformer, a first current transformer and a second current transformer of the nuclear power station, wherein,

The output end of the first generator of the nuclear power station is connected with the input end of the first equipment set through a first switch, and the output end of the first equipment set is connected with the input end of the second equipment set through a second switch;

the output end of the first transformer is provided with the first current transformer, the output end of the first transformer is connected with the input end of the first equipment set through a third switch, the output end of the first transformer is also connected with the input end of the second equipment set through a fourth switch, and the signal end of the first current transformer is connected with a first relay protection device;

the input end of the first transformer is provided with the second current transformer, the input end of the first transformer is connected with a first auxiliary power supply outside the factory, and the signal end of the second current transformer is connected with a second relay protection device;

in the case that whether the loop of the first transformer has a phase failure is tested by the second equipment set, the second switch and the third switch are in an open state, and the first switch and the fourth switch are in a closed state;

when the first generator of the nuclear power station supplies power to the first equipment set and the second equipment set, the first switch and the second switch are in a closed state, and the third switch and the fourth switch are in an open state;

When a first off-site auxiliary power supply is used for supplying power to the first equipment set and the second equipment set through the first transformer, the second switch and the third switch are in a closed state, and the first switch and the fourth switch are in an open state;

the first current transformer is used for controlling the first relay protection device to send an alarm signal under the condition that the phase failure exists at the output end of the first transformer is detected, and the second current transformer is used for controlling the second relay protection device to send an alarm signal under the condition that the phase failure exists at the input end of the first transformer is detected.

As an alternative embodiment, a third device group is also included, wherein,

the output end of the first generator of the nuclear power station is connected with the input end of the first equipment set through the first switch, and the output end of the first generator of the nuclear power station is also connected with the input end of the third equipment set through a fifth switch;

the output end of the first transformer is also connected with the input end of the third equipment set through a sixth switch;

when the first generator of the nuclear power plant supplies power to the first equipment set and the second equipment set, the first switch and the second switch are in a closed state, and the third switch and the fourth switch are in an open state;

When the first off-site auxiliary power supply supplies power to the first equipment set and the second equipment set through the first transformer, the first switch and the fourth switch are in an open state, and the second switch and the third switch are in a closed state;

when the first generator of the nuclear power station supplies power to the third equipment set, the fifth switch is in a closed state, and the sixth switch is in an open state;

and under the condition that the first off-site auxiliary power supply supplies power to the third equipment set through the first transformer, the fifth switch is in an open state, and the sixth switch is in a closed state.

As an alternative embodiment, the device further comprises a second transformer, a third current transformer and a fourth current transformer, wherein,

the output end of the second transformer is provided with the third current transformer, the output end of the second transformer is connected with the output end of the first transformer through a seventh switch, and the signal end of the third current transformer is connected with a third relay protection device;

the input end of the second transformer is provided with the fourth current transformer, the input end of the second transformer is connected with a second auxiliary power supply outside the factory, and the signal end of the fourth current transformer is connected with a fourth relay protection device;

In the case that whether the circuit of the second transformer has a phase failure is tested by the second equipment set, the fourth switch and the seventh switch are in a closed state, and the second switch and the third switch are in an open state;

when the second off-site auxiliary power supply supplies power to the first equipment group and the second equipment group, the first switch and the fourth switch are in an open state, and the second switch, the third switch and the seventh switch are in a closed state;

the third current transformer is used for controlling the third relay protection device to send out an alarm signal under the condition that the phase failure exists at the output end of the second transformer is detected, and the fourth current transformer is used for controlling the fourth relay protection device to send out an alarm signal under the condition that the phase failure exists at the input end of the second transformer is detected.

As an alternative embodiment, the system further comprises a second generator, a fourth equipment set and a fifth equipment set of the nuclear power plant, wherein,

the output end of the second transformer is connected with the input end of the fourth equipment set through an eighth switch, and the output end of the second generator of the nuclear power station is connected with the input end of the fourth equipment set through a ninth switch;

The output end of the second transformer is connected with the input end of the fifth equipment set through a tenth switch, and the output end of the second generator of the nuclear power station is connected with the input end of the fifth equipment set through an eleventh switch;

when the first off-site auxiliary power supply supplies power to the fourth equipment group, the ninth switch is in an open state, and the seventh switch and the eighth switch are in a closed state;

when the second off-site auxiliary power supply supplies power to the fourth equipment group, the seventh switch and the ninth switch are in an open state, and the eighth switch is in a closed state;

when the second generator of the nuclear power plant supplies power to the fourth equipment group, the seventh switch and the eighth switch are in an open state, and the ninth switch is in a closed state;

when the second off-site auxiliary power supply supplies power to the fifth equipment group, the eleventh switch is in an open state, and the tenth switch is in a closed state;

the tenth switch is in an open state and the eleventh switch is in a closed state when the second generator of the nuclear power plant supplies power to the fifth equipment group.

As an optional implementation manner, the device further comprises a sixth device group, wherein the output end of the fourth device group is connected with the input end of the sixth device group through a twelfth switch, and the output end of the second transformer is connected with the input end of the sixth device group through a thirteenth switch;

in the case that whether a phase failure exists in a loop of the second transformer is tested by the sixth equipment set, the seventh switch, the eighth switch and the twelfth switch are in an open state, and the thirteenth switch is in a closed state;

in the case that whether a phase failure exists in a loop of the first transformer is tested by the sixth equipment set, the eighth switch and the twelfth switch are in an open state, and the seventh switch and the thirteenth switch are in a closed state;

and under the condition that the first off-site auxiliary power supply, the second off-site auxiliary power supply or the second generator of the nuclear power station normally supplies power to the sixth equipment set, the twelfth switch is in a closed state, and the thirteenth switch is in an open state.

As an alternative embodiment, a seventh device group and an eighth device group are further included, wherein,

The first generator of the nuclear power station is connected with the input end of the seventh equipment set through a fourteenth switch, and the output end of the second transformer is connected with the input end of the seventh equipment set through a fifteenth switch;

the second generator of the nuclear power station is connected with the input end of the eighth equipment set through a sixteenth switch, and the output end of the first transformer is connected with the input end of the eighth equipment set through a seventeenth switch;

when the third equipment group is abnormal and the first generator of the nuclear power station supplies power to the seventh equipment group, the fourteenth switch is in a closed state, and the fifteenth switch is in an open state;

when the third equipment group is abnormal and the second off-site auxiliary power supply supplies power to the seventh equipment group, the fourteenth switch is in an open state, and the fifteenth switch is in a closed state;

when the fifth equipment group is abnormal and the second generator of the nuclear power station supplies power to the eighth equipment group, the sixteenth switch is in a closed state, and the seventeenth switch is in an open state;

when the fifth equipment group is abnormal and the first off-site auxiliary power supply supplies power to the eighth equipment group, the sixteenth switch is in an open state, and the seventeenth switch is in a closed state.

As an alternative embodiment, the output of the first transformer is provided with an eighteenth switch, the output of the second transformer is provided with a nineteenth switch, wherein,

the output end of the first transformer is connected with the input end of the first equipment set through the eighteenth switch and the third switch in sequence, the output end of the first transformer is connected with the input end of the second equipment set through the eighteenth switch and the fourth switch in sequence, the output end of the first transformer is connected with the input end of the third equipment set through the eighteenth switch and the sixth switch in sequence, the output end of the first transformer is connected with the input end of the eighth equipment set through the eighteenth switch and the seventeenth switch in sequence, and the output end of the first transformer is connected with the output end of the second transformer through the eighteenth switch, the seventh switch and the nineteenth switch in sequence;

the output end of the second transformer is connected with the input end of the seventh equipment set through the nineteenth switch and the fifteenth switch in sequence, the output end of the second transformer is connected with the input end of the fourth equipment set through the nineteenth switch and the eighth switch in sequence, the output end of the second transformer is connected with the input end of the fifth equipment set through the nineteenth switch and the tenth switch in sequence, and the output end of the second transformer is connected with the input end of the seventh equipment set through the nineteenth switch and the fifteenth switch in sequence;

Under the condition that the first off-site auxiliary power supply is required to be used for testing or supplying power, the eighteenth switch is in a closed state;

in the case where the second off-site auxiliary power supply is required for testing or supplying power, the nineteenth switch is in a closed state.

As an alternative embodiment, the transformer further comprises a third transformer, a fourth transformer, a fifth transformer and a sixth transformer, wherein,

the output end of the first generator of the nuclear power station is connected with the input end of the third transformer, and the output end of the third transformer is connected with the input end of the first equipment set through the first switch;

the output end of the first generator of the nuclear power station is connected with the input end of the fourth transformer, the output end of the fourth transformer is connected with the input end of the third equipment set through the fifth switch, and the output end of the fourth transformer is also connected with the input end of the seventh equipment set through the fourteenth switch;

the output end of the second generator of the nuclear power station is connected with the input end of the fifth transformer, and the output end of the fifth transformer is connected with the input end of the fourth equipment set through the ninth switch;

The output end of the second generator of the nuclear power station is connected with the input end of the sixth transformer, and the output end of the sixth transformer is connected with the input end of the fifth equipment set through the eleventh switch; the output end of the sixth transformer is also connected with the input end of the eighth equipment set through the sixteenth switch.

As an alternative embodiment, the system further comprises a first standby generator, a second standby generator, a third standby generator and a fourth standby generator, wherein,

the output end of the first standby generator is connected with the input end of the third equipment group, the output end of the second standby generator is connected with the input end of the fifth equipment group, the output end of the third standby generator is connected with the input end of the seventh equipment group, and the output end of the fourth standby generator is connected with the input end of the eighth equipment group.

As an alternative embodiment, the system further comprises a fifth standby generator, the fifth standby generator is connected with the input end of the third equipment set through a twenty-first switch, the fifth standby generator is connected with the input end of the fifth equipment set through a twenty-second switch, the fifth standby generator is connected with the input end of the seventh equipment set through a twenty-third switch, and the fifth standby generator is connected with the input end of the eighth equipment set through a twenty-third switch. One of the above technical solutions has the following advantages or beneficial effects:

According to the embodiment, the loop test of the first transformer is carried out by detaching the second equipment set, the second switch and the third switch are set to be in an open state, the first switch and the fourth switch are set to be in a closed state for testing, and whether the loop of the first transformer is out of phase is effectively detected by the second equipment set while the work of the first equipment set is not influenced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

FIG. 1 is a schematic diagram of a system wiring scheme for a nuclear power plant provided by an embodiment of the present invention;

fig. 2 is a schematic diagram of another system wiring scheme of a nuclear power plant according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, fig. 1 is a schematic diagram of a system wiring scheme of a nuclear power plant according to an embodiment of the present invention, and as shown in fig. 1, the system wiring scheme of the nuclear power plant includes a first generator 11, a first equipment set 21, a second equipment set 22, a first transformer T1, a first current transformer TA1 and a second current transformer TA2,

the output end of the first generator 11 of the nuclear power station is connected with the input end of the first equipment set 21 through a first switch S1, and the output end of the first equipment set 21 is connected with the input end of the second equipment set 22 through a second switch S2;

the output end of the first transformer T1 is provided with a first current transformer TA1, the output end of the first transformer T1 is connected with the input end of the first equipment set 21 through a third switch S3, the output end of the first transformer T1 is also connected with the input end of the second equipment set 22 through a fourth switch S4, and the signal end of the first current transformer TA1 is connected with a first relay protection device;

the input end of the first transformer T1 is provided with a second current transformer TA2, the input end of the first transformer T1 is connected with a first auxiliary power supply outside the factory, and the signal end of the second current transformer TA2 is connected with a second relay protection device;

in the case of testing whether there is a phase failure in the loop of the first transformer T1 by the second equipment group 22, the second switch S2 and the third switch S3 are in an open state, and the first switch S1 and the fourth switch S4 are in a closed state;

In the case where the first generator 11 of the nuclear power plant supplies power to the first equipment group 21 and the second equipment group 22, the first switch S1 and the second switch S2 are in a closed state, and the third switch S3 and the fourth switch S4 are in an open state;

in the case of supplying power to the first device group 21 and the second device group 22 through the first transformer T1 using the first off-plant auxiliary power source, the second switch S2 and the third switch S3 are in a closed state, and the first switch S1 and the fourth switch S4 are in an open state;

the first current transformer TA1 is used for controlling the first relay protection device to send out an alarm signal under the condition that the phase failure exists at the output end of the first transformer T1 is detected, and the second current transformer TA2 is used for controlling the second relay protection device to send out an alarm signal under the condition that the phase failure exists at the input end of the first transformer T1 is detected.

In this embodiment, the loop test of the first transformer T1 is performed by detaching the second device group 22, setting the second switch S2 and the third switch S3 to be in an open state, and setting the first switch S1 and the fourth switch S4 to be in a closed state, so that the second device group 22 effectively detects whether the loop of the first transformer T1 has a phase failure while the operation of the first device group 21 is not affected. Specifically, when the first generator 11 of the nuclear power plant supplies power to the first equipment set 21 and the second equipment set 22, that is, when the first switch S1 and the second switch S2 are in a closed state and the third switch S3 and the fourth switch S4 are in an open state under the condition of normal operation in the plant, the first generator 11 of the nuclear power plant supplies power to the first equipment set 21 through the first switch S1, and meanwhile, the second equipment set 22 and the first equipment set 21 are connected through the second switch S2, and the first generator 11 of the nuclear power plant can supply power to the second equipment set 22 through the second switch S2.

In addition, when the open-phase detection needs to be performed on the loop of the first transformer T1, the second switch S2 and the third switch S3 are set to be in an open state, and the first switch S1 and the fourth switch S4 are set to be in a closed state, so that the first generator 11 of the nuclear power plant can normally supply power to the first equipment set 21 without being affected, and simultaneously, the first auxiliary power supply outside the plant supplies power to the second equipment set 22, at this time, both sides of the first transformer T1 are electrified, and the current magnitude is within the detection range of the first current transformer TA1 and the second current transformer TA2, so that whether the open-phase exists in the related system of the first transformer T1 can be effectively detected.

The input end of the first transformer T1 is a high-voltage side, the output end of the first transformer T1 is a low-voltage side, whether the low-voltage side has a phase failure or not can be detected through the first current transformer TA1, whether the high-voltage side has a phase failure or not can be detected through the second current transformer TA2, and the efficiency of troubleshooting of maintenance personnel is improved. Meanwhile, the signal end of the first current transformer TA1 is connected with the first relay protection device, the signal end of the second current transformer TA2 is connected with the second relay protection device, and an alarm signal is sent out when phase failure is detected, so that personnel errors can be avoided, and the reliability of detection is ensured.

Specifically, when the first relay protection device sends out the alarm signal, it can be considered that the low-voltage side of the first transformer T1 is out of phase, and at this time, maintenance personnel can perform investigation according to the fault investigation scheme of the low-voltage side. Correspondingly, if the second relay protection device sends out an alarm signal, maintenance personnel can conduct investigation according to a fault investigation scheme of the high-voltage side.

The first device group 21 and the second device group 22 are non-safety devices in the factory, and do not affect the normal operation of the unit when power failure occurs, and can be better used for phase failure testing of the first transformer T1. Meanwhile, the number of the in-plant devices in the second device group 22 needs to be controlled within a certain range, so that the current passing through the first transformer T1 during the test can be detected by the first current transformer TA1 and the second current transformer TA2, and meanwhile, the electric energy loss caused by the periodic test is reduced.

In consideration of the safety of the nuclear power plant, a switch in the nuclear power plant needs to be a breaker, and wiring is automatically disconnected when equipment or an area in the nuclear power plant is short-circuited.

In addition, in order to improve the safety of power supply, a twenty-fourth switch S24, a twenty-fifth switch S25, and a twenty-sixth switch S26 are further provided in the system, as shown in fig. 1, the twenty-fourth switch S24 is provided between the output terminal of the first transformer T1 and the third switch S3, the twenty-fifth switch S25 is provided between the input terminal of the first transformer T1 and the fourth switch S4, the twenty-sixth switch S26 is provided between the first switch S1 and the input of the first device group 21, and the twenty-sixth switch S26 is also provided between the third switch S3 and the first device group 21. In the case where one of the first switch S1 or the third switch S3 is in the closed state, the twenty-sixth switch S26 is in the closed state; in the case where both the first switch S1 and the third switch S3 are in the off state, the twenty-sixth switch S26 is in the off state. In the case where the short circuit does not occur, the state of the twenty-fourth switch S24 and the state of the third switch S3 are kept identical, and the state of the twenty-fifth switch S25 and the state of the fourth switch S4 are kept identical. By setting the twenty-fourth switch S24 and the twenty-fifth switch S25, the occurrence of a system short circuit caused by abnormal and abnormal disconnection of the first switch S1 and the fourth switch S4 is prevented.

As an alternative embodiment, as shown in fig. 2, a third device group 23 is also included, wherein,

the output end of the first generator 11 of the nuclear power station is connected with the input end of the first equipment set 21 through a first switch S1, and the output end of the first generator 11 of the nuclear power station is also connected with the input end of the third equipment set 23 through a fifth switch S5;

the output end of the first transformer T1 is also connected with the input end of the third equipment set 23 through a sixth switch S6;

in the case where the first off-plant auxiliary power supply supplies power to the first equipment group 21 and the second equipment group 22 through the first transformer T1, the first switch S1 and the fourth switch S4 are in an open state, and the second switch S2 and the third switch S3 are in a closed state;

in the case where the first generator 11 of the nuclear power plant supplies power to the third equipment group 23, the fifth switch S5 is in a closed state, and the sixth switch S6 is in an open state;

in the case where the first off-plant auxiliary power supply supplies power to the third device group 23 through the first transformer T1, the fifth switch S5 is in an open state, and the sixth switch S6 is in a closed state.

In this embodiment, the third equipment set 23 is a safety level equipment in the nuclear power plant, which has a high safety requirement, and if a power outage occurs, serious consequences such as core damage may be caused, so that the safety design needs to ensure that the third equipment set 23 does not have power outage. In this embodiment, the first generator 11 of the nuclear power plant normally operates, and at this time, the fifth switch S5 is set to the closed state, and the sixth switch S6 is set to the open state. When the first generator 11 of the nuclear power plant is abnormal and cannot supply power to the third equipment group 23, the first auxiliary power supply outside the nuclear power plant supplies power to the third equipment group 23 through the first transformer T1, and at this time, the fifth switch S5 is set to an open state and the sixth switch S6 is set to a closed state, so that long-time power supply to the third equipment group 23 is realized.

In addition, in order to improve the safety of the system, the system is further provided with a twenty-seventh switch S27, and the twenty-seventh switch S27 is provided between the output terminal of the first transformer T1 and the sixth switch S6. The occurrence of the abnormal disconnection of the sixth switch S6, which causes the system short circuit, is prevented by the arrangement of the twenty-seventh switch S27.

As an alternative embodiment, the transformer further comprises a second transformer T2, a third current transformer TA3 and a fourth current transformer TA4, wherein,

The output end of the second transformer T2 is provided with a third current transformer TA3, the output end of the second transformer T2 is connected with the output end of the first transformer T1 through a seventh switch S7, and the signal end of the third current transformer TA3 is connected with a third relay protection device;

the input end of the second transformer T2 is provided with a fourth current transformer TA4, the input end of the second transformer T2 is connected with a second auxiliary power supply outside the factory, and the signal end of the fourth current transformer TA4 is connected with a fourth relay protection device;

in the case of testing whether there is a phase failure in the loop of the second transformer T2 by the second device group 22, the fourth switch S4 and the seventh switch S7 are in a closed state, and the second switch S2 and the third switch S3 are in an open state;

in the case where the second off-plant auxiliary power supply supplies power to the first equipment group 21 and the second equipment group 22, the first switch S1 and the fourth switch S4 are in an open state, and the second switch S2, the third switch S3 and the seventh switch S7 are in a closed state;

the third current transformer TA3 is used for controlling the third relay protection device to send an alarm signal when detecting that the output end of the second transformer T2 has a phase failure, and the fourth current transformer TA4 is used for controlling the fourth relay protection device to send an alarm signal when detecting that the input end of the second transformer T2 has a phase failure.

In this embodiment, there is generally more than one external auxiliary power source in the factory, and a plurality of external auxiliary power sources can effectively ensure that the devices of the first device group 21, the second device group 22 and the third device group 23 in the factory are not powered off as much as possible, so as to improve the stability of power supply. In this embodiment, an external auxiliary power supply, that is, a second external auxiliary power supply, is added to supply power. Specifically, when the second off-site auxiliary power supply supplies power to the first device group 21 and the second device group 22, the first switch S1 and the fourth switch S4 are set to an open state, and the second switch S2, the third switch S3, and the seventh switch S7 are set to a closed state.

Because the second auxiliary power supply outside the factory is added to supply power, the phase failure test needs to be performed on the related system, namely, the phase failure test needs to be performed on the input end and the output end of the second transformer T2. In the present embodiment, when the second device group 22 is used to test whether the circuit of the second transformer T2 has a phase failure, the fourth switch S4 and the seventh switch S7 are set to be in the closed state, the second switch S2 and the third switch S3 are set to be in the open state, and the second device group 22 is used to perform the phase failure test on the circuit of the second transformer T2.

The input end of the second transformer T2 is a high-voltage side, the output end of the second transformer T2 is a low-voltage side, whether the low-voltage side has a phase failure or not can be detected through the third current transformer TA3, whether the high-voltage side has a phase failure or not can be detected through the fourth current transformer TA4, and the efficiency of troubleshooting of maintenance personnel is improved. Meanwhile, the signal end of the third current transformer TA3 is connected with the third relay protection device, the signal end of the fourth current transformer TA4 is connected with the fourth relay protection device, and an alarm signal is sent out when phase failure is detected, so that personnel errors can be avoided, and the reliability of detection is ensured.

As an alternative embodiment, the second generator 12, the fourth equipment set 24 and the fifth equipment set 25 of the nuclear power plant are also comprised, wherein,

the output end of the second transformer T2 is connected with the input end of the fourth equipment set 24 through an eighth switch S8, and the output end of the second generator 12 of the nuclear power station is connected with the input end of the fourth equipment set 24 through a ninth switch S9;

the output end of the second transformer T2 is connected with the input end of the fifth equipment set 25 through a tenth switch S10, and the output end of the second generator 12 of the nuclear power station is connected with the input end of the fifth equipment set 25 through an eleventh switch S11;

In the case where the first off-plant auxiliary power supply supplies power to the fourth equipment group 24, the ninth switch S9 is in an open state, and the seventh switch S7 and the eighth switch S8 are in a closed state;

in the case where the second off-plant auxiliary power supply supplies power to the fourth equipment group 24, the seventh switch S7 and the ninth switch S9 are in an open state, and the eighth switch S8 is in a closed state;

in the case where the second generator 12 of the nuclear power plant supplies power to the fourth equipment group 24, the seventh switch S7 and the eighth switch S8 are in an open state, and the ninth switch S9 is in a closed state;

when the second off-site auxiliary power supply supplies power to the fifth equipment group 25, the eleventh switch S11 is in an open state, and the tenth switch S10 is in a closed state;

in the case where the second generator 12 of the nuclear power plant supplies power to the fifth equipment group 25, the tenth switch S10 is in an open state, and the eleventh switch S11 is in a closed state.

In this embodiment, there is typically more than one nuclear power plant generator within the plant, and multiple nuclear power plant generators may be substituted to supply power to the plant equipment. Different nuclear power plant generators correspond to different in-plant devices, and the in-plant devices are divided according to the number of the nuclear power plant generators and then are powered. For example, the first generator 11 of the nuclear power plant supplies power to the first equipment group 21, the second equipment group 22 and the third equipment group 23, and the second generator 12 of the nuclear power plant supplies power to the fourth equipment group 24 and the fifth equipment group 25. In the case of power supply of different nuclear power plant generators, the abnormal condition of the different nuclear power plant generators needs to be considered, and in the case of power supply by adopting an external auxiliary power supply, only the in-plant equipment corresponding to the abnormal nuclear power plant generator needs to be supplied. For example, a first off-site auxiliary power supply supplies power to the first device group 21, the second device group 22, or the third device group 23, and a second off-site auxiliary power supply supplies power to the fourth device group 24 or the fifth device group 25.

In this embodiment, there are electric devices such as the first device group 21, the second device group 22, the third device group 23, the fourth device group 24, and the fifth device group 25, and there are power supply portions such as the first external auxiliary power supply, the second external auxiliary power supply, the first generator 11 of the nuclear power station, and the second generator 12 of the nuclear power station, where different power supply portions and different electric devices have different power supply situations. It can be understood that the first generator 11 or the second generator 12 is first used to supply power, and the first auxiliary power source or the second auxiliary power source is used to supply auxiliary power when the first generator 11 or the second generator 12 cannot supply power.

Wherein, when the first off-site auxiliary power supply supplies power to the fourth equipment group 24, the ninth switch S9 is set to an off state, and the seventh switch S7 and the eighth switch S8 are set to an on state; when the second off-site auxiliary power supply supplies power to the fourth equipment group 24, the seventh switch S7 and the ninth switch S9 are set to an open state, and the eighth switch S8 is set to a closed state; when the second generator 12 of the nuclear power plant supplies power to the fourth equipment group 24, the seventh switch S7 and the eighth switch S8 are set to an open state, and the ninth switch S9 is set to a closed state; when the second off-site auxiliary power supply supplies power to the fifth equipment group 25, the eleventh switch S11 is set to the open state, and the tenth switch S10 is set to the closed state; when the second generator 12 of the nuclear power plant supplies power to the fifth equipment group 25, the tenth switch S10 is set to an open state, and the eleventh switch S11 is set to a closed state.

In addition, in order to improve the safety of the system, the system is further provided with a twenty-eighth switch S28, a twenty-ninth switch S29, and a thirty-ninth switch S30. Wherein a twenty-eighth switch S28 is provided between the output of the second transformer T2 and the eighth switch S8, a twenty-ninth switch S29 is provided between the output of the second transformer T2 and the tenth switch S10, a thirty-eighth switch S30 is provided between the eighth switch S8 and the input of the fourth device group 24, and a thirty-eighth switch S30 is also provided between the ninth switch S9 and the input of the fourth device group 24. Wherein the state of the twenty-eighth switch S28 and the eighth switch S8 remain the same and the states of the twenty-ninth switch S29 and the tenth switch S10 remain the same without a short circuit. While either one of the eighth switch S8 or the ninth switch S9 is kept in a closed state, the thirty-first switch S30 is kept in a closed state; when the eighth switch S8 and the ninth switch S9 are set to the off state, the thirty-first switch S30 is set to the off state. By providing the twenty-eighth switch S28 and the twenty-ninth switch S29, the occurrence of a system short circuit caused by abnormal failure of the eighth switch S8 and the tenth switch S10 is prevented.

As an alternative embodiment, the device further comprises a sixth device group 26, the output end of the fourth device group 24 is connected to the input end of the sixth device group 26 through a twelfth switch S12, and the output end of the second transformer T2 is connected to the input end of the sixth device group 26 through a thirteenth switch S13;

In the case of testing whether there is a phase failure in the loop of the second transformer T2 by the sixth equipment group 26, the seventh switch S7, the eighth switch S8 and the twelfth switch S12 are in an open state, and the thirteenth switch S13 is in a closed state;

in the case of testing whether there is a phase failure in the circuit of the first transformer T1 by the sixth equipment group 26, the eighth switch S8 and the twelfth switch S12 are in an open state, and the seventh switch S7 and the thirteenth switch S13 are in a closed state;

in the case where the first off-plant auxiliary power supply, the second off-plant auxiliary power supply, or the second generator 12 of the nuclear power plant normally supplies power to the sixth equipment group 26, the twelfth switch S12 is in the closed state and the thirteenth switch S13 is in the open state.

In this embodiment, the device of the sixth device group 26 is an in-plant unsafe device, which is set for a purpose similar to that of the second device group 22, and the phase failure test of the second transformer T2 is implemented by splitting a few in-plant unsafe devices. The second transformer T2 and the first transformer T1 are auxiliary transformers. In the present embodiment, when the sixth device group 26 is used to test whether or not there is a phase failure in the circuit of the second transformer T2, the seventh switch S7, the eighth switch S8, and the twelfth switch S12 are set to the open state, and the thirteenth switch S13 is set to the closed state. In addition, the sixth device group 26 may be used to test whether or not the first transformer T1 has a phase failure, and when the sixth device group 26 tests whether or not the circuit of the first transformer T1 has a phase failure, the eighth switch S8 and the twelfth switch S12 are set to an open state, and the seventh switch S7 and the thirteenth switch S13 are set to a closed state.

When the open-phase test is not necessary, the twelfth switch S12 is turned on, the thirteenth switch S13 is turned off, and the sixth equipment group 26 and the fourth equipment group 24 are integrated, and power is supplied from the first auxiliary power supply outside the plant, the second auxiliary power supply outside the plant, or the second generator 12 of the nuclear power plant.

In addition, in order to improve the safety of the system, a thirty-first switch S31 is further provided in the system, the thirty-first switch S31 is provided between the output terminal of the second transformer T2 and the thirteenth switch S13, and when no short circuit occurs, the thirty-first switch S31 and the thirteenth switch S13 maintain the same state, thereby preventing the occurrence of a system short circuit due to abnormal failure of the thirteenth switch S13.

As an alternative embodiment, a seventh device group 27 and an eighth device group 28 are also included, wherein,

the first generator 11 of the nuclear power station is connected with the input end of the seventh equipment set 27 through a fourteenth switch S14, and the output end of the second transformer T2 is connected with the input end of the seventh equipment set 27 through a fifteenth switch S15;

the second generator 12 of the nuclear power plant is connected with the input end of the eighth equipment set 28 through a sixteenth switch S16, and the output end of the first transformer T1 is connected with the input end of the eighth equipment set 28 through a seventeenth switch S17;

In the case that the third equipment group 23 is abnormal and the first generator 11 of the nuclear power plant supplies power to the seventh equipment group 27, the fourteenth switch S14 is in a closed state and the fifteenth switch S15 is in an open state;

in the case where the third equipment group 23 is abnormal and the second off-plant auxiliary power supply supplies power to the seventh equipment group 27, the fourteenth switch S14 is in an open state, and the fifteenth switch S15 is in a closed state;

in the case where the fifth equipment group 25 is abnormal and the second generator 12 of the nuclear power plant supplies power to the eighth equipment group 28, the sixteenth switch S16 is in a closed state and the seventeenth switch S17 is in an open state;

in the case where the fifth equipment group 25 is abnormal and the first off-plant auxiliary power supply supplies power to the eighth equipment group 28, the sixteenth switch S16 is in an open state and the seventeenth switch S17 is in a closed state.

In the present embodiment, considering that the third device group 23 and the fifth device group 25 are both security level devices, the importance is high, and no inoperable abnormality can occur. However, in addition to the power failure of the equipment, other problems need to be considered to cause the equipment to fail to work normally, so that the standby equipment needs to be arranged for emergency supplement. The present embodiment provides the seventh device group 27 as a spare group for the third device group 23 and the eighth device group 28 as a spare group for the fifth device group 25.

The seventh device group 27 is a spare group of the third device group 23, and is distinguished in power supply manner to improve reliability of power supply. Wherein the third set of devices 23 is typically powered by the first generator 11 of the nuclear power plant or the first off-site auxiliary power supply, and the seventh set of devices 27 is typically powered by the first generator 11 of the nuclear power plant or the second off-site auxiliary power supply. Similarly, the eighth device group 28 is a spare group of the fifth device group 25, and a difference is made in power supply manner, wherein the fifth device group 25 is usually powered by the second generator 12 of the nuclear power plant or the second auxiliary power source outside the plant, and the eighth device group 28 is usually powered by the second generator 12 of the nuclear power plant or the first auxiliary power source outside the plant, so as to improve the reliability of power supply.

In addition, in order to improve the safety of the system, a thirty-second switch S32 and a thirty-third switch S33 are further provided in the system, the thirty-second switch S32 is provided between the output terminal of the first transformer T1 and the seventeenth switch S17, and the thirty-third switch S33 is provided between the output terminal of the second transformer T2 and the fifteenth switch S15. In the case where the short circuit does not occur, the thirty-second switch S32 and the seventeenth switch S17 remain in the same state, and the thirty-third switch S33 and the fifteenth switch S15 remain in the same state. By providing the thirty-second switch S32 and the thirty-third switch S33 in the system, the occurrence of a situation that the fifteenth switch S15 and the seventeenth switch S17 are abnormally and abnormally opened, which causes a short circuit of the system, is prevented.

As an alternative embodiment, the output of the first transformer T1 is provided with an eighteenth switch S18, the output of the second transformer T2 is provided with a nineteenth switch S19, wherein,

the output end of the first transformer T1 is connected with the input end of the first equipment set 21 through an eighteenth switch S18 and a third switch S3 in sequence, the output end of the first transformer T1 is connected with the input end of the second equipment set 22 through an eighteenth switch S18 and a fourth switch S4 in sequence, the output end of the first transformer T1 is connected with the input end of the third equipment set 23 through an eighteenth switch S18 and a sixth switch S6 in sequence, the output end of the first transformer T1 is connected with the input end of the eighth equipment set 28 through an eighteenth switch S18 and a seventeenth switch S17 in sequence, and the output end of the first transformer T1 is connected with the output end of the second transformer T2 through an eighteenth switch S18, a seventeenth switch S7 and a nineteenth switch S19 in sequence;

the output end of the second transformer T2 is connected with the input end of the seventh equipment set 27 through a nineteenth switch S19 and a fifteenth switch S15 in sequence, the output end of the second transformer T2 is connected with the input end of the fourth equipment set 24 through a nineteenth switch S19 and an eighth switch S8 in sequence, the output end of the second transformer T2 is connected with the input end of the fifth equipment set 25 through a nineteenth switch S19 and a tenth switch S10 in sequence, and the output end of the second transformer T2 is connected with the input end of the seventh equipment set 27 through a nineteenth switch S19 and a fifteenth switch S15 in sequence;

In the case that the first off-site auxiliary power supply is required for testing or supplying power, the eighteenth switch S18 is in a closed state;

in case a second off-site auxiliary power supply is required for testing or powering, the nineteenth switch S19 is in a closed state.

In this embodiment, since more devices are connected to the output end of the first transformer T1 and the output end of the second transformer T2, in order to avoid the short circuit of the whole system caused by an abnormality of a certain device, an eighteenth switch S18 is disposed at the output end of the first transformer T1, and a nineteenth switch S19 is disposed at the output end of the second transformer T2.

In the case where the first off-site auxiliary power supply is not required for testing or supplying power, the eighteenth switch S18 is set to the off state. Similarly, in the case where the second off-plant auxiliary power supply is not required for the test or the power supply, the nineteenth switch S19 is set to the off state.

In addition, in order to improve the safety of the system, a thirty-fourth switch S34 and a thirty-fifth switch S35 are further provided in the system, wherein the thirty-fourth switch S34 is provided between the input terminal of the first transformer T1 and the first auxiliary power supply outside the plant, the thirty-fifth switch S35 is provided between the input terminal of the second transformer T2 and the second auxiliary power supply outside the plant, and the thirty-fourth switch S34 and the thirty-fifth switch S35 are normally set to a closed state; setting the thirty-fourth switch S34 to an off state in the case that the first off-plant auxiliary power supply is abnormal; in the case of abnormality of the second off-plant auxiliary power supply, the thirty-fifth switch S35 is set to the off state.

As an alternative embodiment, the transformer further comprises a third transformer T3, a fourth transformer T4, a fifth transformer T5 and a sixth transformer T6, wherein,

the output end of the first generator 11 of the nuclear power station is connected with the input end of a third transformer T3, and the output end of the third transformer T3 is connected with the input end of a first equipment set 21 through a first switch S1;

the output end of the first generator 11 of the nuclear power station is connected with the input end of a fourth transformer T4, the output end of the fourth transformer T4 is connected with the input end of a third equipment group 23 through a fifth switch S5, and the output end of the fourth transformer T4 is also connected with the input end of a seventh equipment group 27 through a fourteenth switch S14;

the output end of the second generator 12 of the nuclear power station is connected with the input end of a fifth transformer T5, and the output end of the fifth transformer T5 is connected with the input end of a fourth equipment set 24 through a ninth switch S9;

the output end of the second generator 12 of the nuclear power station is connected with the input end of a sixth transformer T6, and the output end of the sixth transformer T6 is connected with the input end of a fifth equipment group 25 through an eleventh switch S11; the output of the sixth transformer T6 is also connected to the input of the eighth set of devices 28 via a sixteenth switch S16.

In this embodiment, since the high voltage power is supplied from the first generator 11 of the nuclear power plant, the voltage needs to be controlled within the set voltage ranges of the first equipment set 21 and the second equipment set 22 through the third transformer T3; likewise, the voltage needs to be controlled within the set voltage range of the third device group 23 by the fourth transformer T4. The third transformer T3 and the fourth transformer T4 are high-voltage transformers for factories. The transformation requirement and the power supply requirement of the second generator 12 of the nuclear power station also need to be considered, and the fifth transformer T5 and the sixth transformer T6 are provided to realize the transformation, so that the second generator 12 of the nuclear power station realizes stable power supply of the fourth equipment set 24, the fifth equipment set 25 and the sixth equipment set 26.

In addition, in order to improve the safety of the system, a thirty-sixth switch S36, a thirty-seventh switch S37, a thirty-eighth switch S38, a thirty-ninth switch S39, a forty-first switch S40, and a forty-first switch S41 are also provided in the system. Wherein a thirty-sixth switch S36 is provided between the output terminal of the third transformer T3 and the first switch S1, a thirty-seventh switch S37 is provided between the output terminal of the fourth transformer T4 and the fifth switch S5, a thirty-eighth switch S38 is provided between the output terminal of the fourth transformer T4 and the fourteenth switch S14, a thirty-ninth switch S39 is provided between the output terminal of the fifth transformer T5 and the ninth switch S9, a fortieth switch S40 is provided between the output terminal of the sixth transformer T6 and the eleventh switch S11, and a fortieth switch S41 is provided between the output terminal of the sixth transformer T6 and the sixteenth switch S16. In the case where the short circuit does not occur, the state of the thirty-eighth switch S36 and the state of the first switch S1 are kept identical, the state of the thirty-seventeenth switch S37 and the state of the fifth switch S5 are kept identical, the state of the thirty-eighth switch S38 and the state of the fourteenth switch S14 are kept identical, the state of the thirty-ninth switch S39 and the state of the ninth switch S9 are kept identical, the state of the fortieth switch S40 and the state of the eleventh switch S11 are kept identical, and the state of the fortieth switch S41 and the state of the sixteenth switch S16 are kept identical. By providing the thirty-sixth switch S36, the thirty-seventh switch S37, the thirty-eighth switch S38, the thirty-ninth switch S39, the fortieth switch S40, and the fortieth-first switch S41, the occurrence of a system short circuit caused by abnormal failure of the first switch S1, the fifth switch S5, the ninth switch S9, the eleventh switch S11, the fourteenth switch S14, and the sixteenth switch S16 is prevented.

In addition, a forty-two switch S42 is further provided in the system, the forty-two switch S42 is provided before the input end of the first equipment set 21 and the output end of the fourth equipment set 24, and when the forty-two switch S42 is set to the closed state, the first equipment set 21 and the fourth equipment set 24 can form a whole, and power supply can be realized by the first auxiliary power supply outside the plant, the second auxiliary power supply outside the plant, the first generator 11 of the nuclear power plant or the second generator 12 of the nuclear power plant.

As an alternative embodiment, the system further comprises a first standby generator 31, a second standby generator 32, a third standby generator 33 and a fourth standby generator 34, wherein an output end of the first standby generator 31 is connected to an input end of the third equipment set 23, an output end of the second standby generator 32 is connected to an input end of the fifth equipment set 25, an output end of the third standby generator 33 is connected to an input end of the seventh equipment set 27, and an output end of the fourth standby generator 34 is connected to an input end of the eighth equipment set 28.

In this embodiment, it is considered that the first generator 11 of the nuclear power plant and the first auxiliary power supply outside the plant cannot supply power, and since the devices of the third device group 23 are devices that cannot be powered off, an emergency power supply needs to be added to supply power. In the present embodiment, the first backup generator 31 is provided as an emergency power source, and when the first generator 11 and the first auxiliary power source outside the nuclear power plant cannot supply power, the fifth switch S5 and the sixth switch S6 are turned off, and the first backup generator 31 supplies power to the third equipment group 23.

Likewise, in the case where the second backup generator 32 supplies power to the fifth equipment group 25, the tenth switch S10 and the eleventh switch S11 are in an off state; in the case where the third backup generator 33 supplies power to the seventh device group 27, the fourteenth switch S14 and the fifteenth switch S15 are in an off state; in the case where the fourth backup generator 34 supplies power to the eighth device group 28, the sixteenth switch S16 and the seventeenth switch S17 are in an off state.

The first, second, third and fourth backup generators 31, 32, 33, 34 may be emergency diesel generators.

As an alternative embodiment, the system further comprises a fifth standby generator 35, the fifth standby generator 35 is connected to the input end of the third equipment set 23 through a twenty-first switch S20, the fifth standby generator 35 is connected to the input end of the fifth equipment set 25 through a twenty-first switch S21, the fifth standby generator 35 is connected to the input end of the seventh equipment set 27 through a twenty-second switch S22, and the fifth standby generator 35 is connected to the input end of the eighth equipment set 28 through a twenty-third switch S23;

in the present embodiment, in the case that the first standby power generator 31 cannot supply power to the third device group 23, or the second standby power generator 32 cannot supply power to the fifth device group 25, or the third standby power generator 33 cannot supply power to the seventh device group 27, or the fourth standby power generator 34 cannot supply power to the eighth device group 28, the fifth standby power generator 35 is used to supply power at this time, so that the power supply requirement of the safety-level device is satisfied.

Wherein, in the case where the fifth backup generator 35 supplies power to the third device group 23, the twentieth switch S20 is in a closed state; in the case where the fifth backup generator 35 supplies power to the fifth equipment group 25, the twenty-first switch S21 is in a closed state; in the case where the fifth backup generator 35 supplies power to the seventh device group 27, the twenty-second switch S22 is in a closed state; with the fifth backup generator 35 supplying power to the eighth device group 28, the twenty-third switch S23 is in a closed state.

In addition, a forty-third switch S43 and a forty-fourth switch S44 are further provided in the system, wherein the forty-third switch S43 is provided between the fifth standby generator 35 and the twentieth switch S20, and the forty-third switch S43 is also provided between the fifth standby generator 35 and the twenty-second switch S22; a forty-fourth switch S44 is provided between the fifth backup generator 35 and the twenty-first switch S21, and a forty-fourth switch S44 is also provided between the fifth backup generator 35 and the twenty-third switch S23. In the case that the system is not shorted, if either one of the twentieth switch S20 or the twenty-second switch S22 is in a closed state, the forty-third switch S43 is in a closed state; in the case where both the twentieth switch S20 and the twenty-second switch S22 are in the off state, the forty-third switch S43 is in the off state. Likewise, in the case where a short circuit does not occur in the system, in the case where either one of the twenty-first switch S21 or the twenty-third switch S23 is in the closed state, the forty-fourth switch S44 is in the closed state; in the case where both the twenty-first switch S21 and the twenty-third switch S23 are in the off state, the forty-fourth switch S44 is in the off state. By providing the forty-third switch S43 and the forty-fourth switch S44 in the system, the occurrence of a system short circuit caused by abnormal and abnormal disconnection of the twenty-first switch S20, the twenty-second switch S21, the twenty-second switch S22 and the twenty-third switch S23 is prevented.

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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.

Claims

1. A nuclear power plant system wiring scheme, comprising: a first generator, a first equipment set, a second equipment set, a first transformer, a first current transformer and a second current transformer of the nuclear power station, wherein,

2. The nuclear power plant system wiring scheme of claim 1, further comprising a third set of equipment, wherein,

3. The nuclear power plant system wiring scheme of claim 2, further comprising a second transformer, a third current transformer, and a fourth current transformer, wherein,

4. The nuclear power plant system wiring scheme of claim 3 further comprising a second generator, a fourth equipment set, and a fifth equipment set of the nuclear power plant, wherein,

5. The nuclear power plant system wiring scheme of claim 4, further comprising a sixth equipment group, an output of the fourth equipment group being connected to an input of the sixth equipment group through a twelfth switch, an output of the second transformer being connected to an input of the sixth equipment group through a thirteenth switch;

6. The nuclear power plant system wiring scheme of claim 5 further comprising a seventh set of equipment and an eighth set of equipment, wherein,

7. The nuclear power plant system wiring scheme of claim 6, wherein the output of the first transformer is provided with an eighteenth switch and the output of the second transformer is provided with a nineteenth switch, wherein,

8. The nuclear power plant system wiring scheme of claim 6, further comprising a third transformer, a fourth transformer, a fifth transformer, and a sixth transformer, wherein,

9. The nuclear power plant system wiring scheme of claim 6, further comprising a first backup generator, a second backup generator, a third backup generator, and a fourth backup generator, wherein,

10. The nuclear power plant system wiring scheme of claim 9 further comprising a fifth backup generator connected to the input of the third plant group through a twenty-first switch, the fifth backup generator connected to the input of the fifth plant group through a twenty-second switch, the fifth backup generator connected to the input of the seventh plant group through a twenty-third switch, the fifth backup generator connected to the input of the eighth plant group through a twenty-third switch.