CN217335072U

CN217335072U - Nuclear power station system wiring scheme

Info

Publication number: CN217335072U
Application number: CN202221249263.2U
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: 2022-08-30
Anticipated expiration: 2032-05-20

Abstract

The utility model provides a nuclear power station system wiring scheme, include: the system comprises a first generator, a first equipment group, a second equipment group, 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 group through a first switch, and the output end of the first equipment group is connected with the input end of the second equipment group through a second switch; the output end of the first transformer is provided with a first current transformer, the output end of the first transformer is connected with the input end of the first equipment group through a third switch, and the output end of the first transformer is connected with the input end of the second equipment group through a fourth switch. In this embodiment, the second device group is detached to perform the loop test of the first transformer, the second switch and the third switch are set to the open state, the first switch and the fourth switch are set to the closed state to perform the test, and whether the loop of the first transformer has a phase failure or not can be effectively detected through the second device group.

Description

Nuclear power station system wiring scheme

Technical Field

The utility model relates to a nuclear power technology field, concretely relates to nuclear power station system wiring scheme.

Background

The nuclear power station has a high safety level, and more plant equipment exists in the plant and needs to supply power for a long time. When the nuclear power station normally operates, the generator of the nuclear power station supplies power to the in-plant equipment, and when the bus of the generator loses power, the generator needs to be switched to an off-plant auxiliary power supply to supply power to the in-plant equipment, so that the safe shutdown is ensured. The auxiliary transformer is in an idle state when the nuclear power station normally operates, the open-phase fault of the off-plant auxiliary power supply circuit is difficult to detect through the existing equipment, and the routine inspection and troubleshooting can only be carried out through operation and maintenance personnel. However, in the routine inspection, the possibility of human error exists, and the phase failure cannot be found in time, so that the safety of the related system of the auxiliary transformer is low.

It can be seen that there is a problem in the related art that the safety of the related system of the auxiliary transformer is low.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a nuclear power station system wiring scheme to there is the lower problem of security of the correlation system of auxiliary transformer in solving the correlation technique.

In order to achieve the above object, an embodiment of the present invention provides a wiring scheme for a nuclear power station system, including: a first generator, a first equipment group, a second equipment group, a first transformer, a first current transformer and a second current transformer of a 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 group through a first switch, and the output end of the first equipment group is connected with the input end of the second equipment group 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 group through a third switch, the output end of the first transformer is also connected with the input end of the second equipment group through a fourth switch, and the signal end of the first current transformer is connected with a first relay protection device;

the second current transformer is configured at the input end of the first transformer, the input end of the first transformer is connected with a first off-plant auxiliary power supply, and the signal end of the second current transformer is connected with a second relay protection device;

under the condition that whether the loop of the first transformer has phase failure is tested by the second equipment group, 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;

under the condition that the first generator of the nuclear power plant supplies power to the first equipment group and the second equipment group, 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;

in the case where power is supplied to the first and second device groups through the first transformer using a first off-plant auxiliary power source, the second and third switches are in a closed state, and the first and fourth switches are in an open state;

the first current transformer is used for controlling the first relay protection device to send out an alarm signal when detecting that the output end of the first transformer is open-phase, and the second current transformer is used for controlling the second relay protection device to send out an alarm signal when detecting that the input end of the first transformer is open-phase.

As an optional implementation, a third device group is further included, wherein,

the output end of the first generator of the nuclear power station is connected with the input end of the first equipment group 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 group through a fifth switch;

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

in a case where the first off-plant auxiliary power supply supplies power to the first equipment group and the second equipment group 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 plant supplies power to the third equipment group, the fifth switch is in a closed state, and the sixth switch is in an open state;

when the first off-plant auxiliary power supply supplies power to the third equipment group through the first transformer, the fifth switch is in an open state, and the sixth switch is in a closed state.

As an optional implementation, a second transformer, a third current transformer and a fourth current transformer are also included, 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 off-plant auxiliary power supply, and the signal end of the fourth current transformer is connected with a fourth relay protection device;

in the case of testing whether the loop of the second transformer has an open phase through the second equipment group, 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;

in a case where the second off-plant auxiliary power supply supplies power to the first device group and the second device 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 when detecting that the output end of the second transformer is open-phase, and the fourth current transformer is used for controlling the fourth relay protection device to send out an alarm signal when detecting that the input end of the second transformer is open-phase.

As an optional implementation manner, a second generator, a fourth equipment group and a fifth equipment group of the nuclear power plant are further included, wherein,

the output end of the second transformer is connected with the input end of the fourth equipment group 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 group through a ninth switch;

the output end of the second transformer is connected with the input end of the fifth equipment group 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 group through an eleventh switch;

when the first off-plant 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-plant auxiliary power supply supplies power to the fourth device 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-plant 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;

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

As an optional implementation manner, the power supply further includes a sixth device group, an output end of the fourth device group is connected to an input end of the sixth device group through a twelfth switch, and an output end of the second transformer is connected to an input end of the sixth device group through a thirteenth switch;

in the case of testing whether the loop of the second transformer has an open phase through the sixth equipment group, 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 where it is tested whether the loop of the first transformer has an open phase by the sixth equipment group, 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;

when the first off-plant auxiliary power source, the second off-plant auxiliary power source, or the second generator of the nuclear power plant supplies power to the sixth equipment group normally, the twelfth switch is in a closed state, and the thirteenth switch is in an open state.

As an optional implementation manner, 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 group through a fourteenth switch, and the output end of the second transformer is connected with the input end of the seventh equipment group through a fifteenth switch;

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

when the third equipment group is abnormal and the first generator of the nuclear power plant 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-plant 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 plant 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-plant 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, the output terminal of the first transformer is provided with an eighteenth switch, the output terminal 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 group sequentially through the eighteenth switch and the third switch, the output end of the first transformer is connected with the input end of the second equipment group sequentially through the eighteenth switch and the fourth switch, the output end of the first transformer is connected with the input end of the third equipment group sequentially through the eighteenth switch and the sixth switch, the output end of the first transformer is connected with the input end of the eighth equipment group sequentially through the eighteenth switch and the seventeenth switch, and the output end of the first transformer is connected with the output end of the second transformer sequentially through the eighteenth switch, the seventh switch and the nineteenth switch;

the output end of the second transformer is connected with the input end of the seventh equipment group 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 group 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 group 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 group through the nineteenth switch and the fifteenth switch in sequence;

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

in a case where it is necessary to use the second off-plant auxiliary power supply for testing or power supply, the nineteenth switch is in a closed state.

As an optional implementation, a third transformer, a fourth transformer, a fifth transformer and a sixth transformer are also included, 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 group 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 group through the fifth switch, and the output end of the fourth transformer is also connected with the input end of the seventh equipment group 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 group 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 group through the eleventh switch; and the output end of the sixth transformer is also connected with the input end of the eighth equipment group through the sixteenth switch.

As an alternative embodiment, a first standby generator, a second standby generator, a third standby generator and a fourth standby generator are also included, 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 optional implementation manner, the system further includes a fifth standby generator, the fifth standby generator is connected to the input end of the third device group through a twentieth switch, the fifth standby generator is connected to the input end of the fifth device group through a twenty-first switch, the fifth standby generator is connected to the input end of the seventh device group through a twenty-second switch, and the fifth standby generator is connected to the input end of the eighth device group through a twentieth switch. One of the above technical solutions has the following advantages or beneficial effects:

in this embodiment, the second device group is detached to perform the loop test of the first transformer, the second switch and the third switch are set to be in the off state, and the first switch and the fourth switch are set to be in the on state to perform the test, so that when the work of the first device group is not affected, whether the loop of the first transformer has a phase failure or not is effectively detected through the second device group.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic diagram of a wiring scheme of a nuclear power plant system according to an embodiment of the present invention;

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

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

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

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

the output end of the first transformer T1 is configured with a first current transformer TA1, the output end of the first transformer T1 is connected to the input end of the first equipment group 21 through a third switch S3, the output end of the first transformer T1 is further connected to the input end of the second equipment group 22 through a fourth switch S4, and the signal end of the first current transformer TA1 is connected to 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 off-plant auxiliary power supply, 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 an open phase in the loop of the first transformer T1 by the second device 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 and

second device groups

21 and 22 through the first transformer T1 using the first off-plant auxiliary power source, the second and third switches S2 and S3 are in a closed state, and the first and fourth switches S1 and S4 are in an open state;

the first current transformer TA1 is used to control the first relay protection device to send out an alarm signal when detecting that the output end of the first transformer T1 has an open phase, and the second current transformer TA2 is used to control the second relay protection device to send out an alarm signal when detecting that the input end of the first transformer T1 has an open phase.

In this embodiment, the second device group 22 is separated to perform a loop test of the first transformer T1, the second switch S2 and the third switch S3 are set to the open state, and the first switch S1 and the fourth switch S4 are set to the closed state to perform a test, so that the second device group 22 effectively detects whether there is a phase failure in the loop of the first transformer T1 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 group 21 and the second equipment group 22, that is, when the nuclear power plant normally works in the plant, the first switch S1 and the second switch S2 are in a closed state, the third switch S3 and the fourth switch S4 are in an open state, the first generator 11 of the nuclear power plant supplies power to the first equipment group 21 through the first switch S1, and meanwhile, the second equipment group 22 and the first equipment group 21 are connected through the second switch S2, so that the power supply of the first generator 11 of the nuclear power plant to the second equipment group 22 can be realized through the second switch S2.

In addition, when phase failure detection needs to be performed on a loop of the first transformer T1, the second switch S2 and the third switch S3 are set to an open state, and the first switch S1 and the fourth switch S4 are set to a closed state, at this time, the first generator 11 of the nuclear power plant can normally supply power to the first equipment group 21 without being affected, and at the same time, the first off-plant auxiliary power supply supplies power to the second equipment group 22, at this time, both sides of the first transformer T1 are both 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 phase failure exists in a 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 open-phase exists on the low-voltage side or not can be detected through the first current transformer TA1, whether open-phase exists on the high-voltage side 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 mistakes can be avoided, and the reliability of detection is ensured.

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

The first equipment group 21 and the second equipment group 22 are non-safety equipment in a plant, and the normal operation of the unit cannot be influenced when power failure occurs, so that the first equipment group and the second equipment group can be better used for the phase failure test of the first transformer T1. Meanwhile, the number of the on-site 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 in the test process can be detected by the first current transformer TA1 and the second current transformer TA2, and meanwhile, the power loss caused by 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 when equipment or an area in the nuclear power plant is in a short circuit condition, the connection is automatically disconnected.

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 further provided between the third switch S3 and the first device group 21. In the case where there is one of the first switch S1 or the third switch S3 in the closed state, the twenty-sixth switch S26 is in the closed state; with both the first switch S1 and the third switch S3 in the open state, the twenty-sixth switch S26 is in the open state. In the case where no short circuit occurs, the state of the twenty-fourth switch S24 is kept consistent with the state of the third switch S3, and the state of the twenty-fifth switch S25 is kept consistent with the state of the fourth switch S4. By arranging the twenty-fourth switch S24 and the twenty-fifth switch S25, the situation that the first switch S1 and the fourth switch S4 cannot be normally switched off is prevented from causing a short circuit of the system.

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

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

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

in the case where the first off-plant auxiliary power supplies power to the first and

second device groups

21 and 22 through the first transformer T1, the first and fourth switches S1 and S4 are in an open state, and the second and third switches S2 and 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 the closed state, and the sixth switch S6 is in the open state;

in the case where the first plant-outside auxiliary power supplies power to the third equipment 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 group 23 is a safety-level equipment in a nuclear power plant, and has a high safety requirement, and if a power failure occurs, the core may be damaged, and other serious consequences may be caused, so that it is necessary to ensure that the power failure does not occur in the third equipment group 23 in view of safety design. In the present embodiment, in a normal condition, 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 off-plant auxiliary power supply 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 as to supply power to the third equipment group 23 for a long time.

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 arranged between the output terminal of the first transformer T1 and the sixth switch S6. The twenty-seventh switch S27 is arranged to prevent the system short circuit caused by the abnormal failure of the sixth switch S6.

As an alternative embodiment, it further includes 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 configured 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;

a fourth current transformer TA4 is arranged at the input end of the second transformer T2, the input end of the second transformer T2 is connected with a second external auxiliary power supply, 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 an open phase in the loop of the second transformer T2 through 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 supplies power to the first device group 21 and the second device group 22, the first switch S1 and the fourth switch S4 are in the open state, and the second switch S2, the third switch S3, and the seventh switch S7 are in the closed state;

the third current transformer TA3 is used to control the third relay protection device to send out an alarm signal when detecting that the phase failure exists at the output end of the second transformer T2, and the fourth current transformer TA4 is used to control the fourth relay protection device to send out an alarm signal when detecting that the phase failure exists at the input end of the second transformer T2.

In this embodiment, more than one external auxiliary power sources are usually present in the plant, and the 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 plant are not powered off as much as possible, thereby improving the stability of power supply. In this embodiment, an external auxiliary power source, i.e. a second external auxiliary power source, is added for supplying power. Specifically, in the case where the second off-plant 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 the open state, and the second switch S2, the third switch S3, and the seventh switch S7 are set to the closed state.

Due to the fact that the second off-plant auxiliary power supply is added for supplying power, the phase failure test needs to be conducted on the relevant system, namely the phase failure test needs to be conducted on the input end and the output end of the second transformer T2. In the present embodiment, in the case of testing whether the loop of the second transformer T2 has an open phase through the second device group 22, the open phase test on the loop of the second transformer T2 is implemented through the second device group 22 by setting the fourth switch S4 and the seventh switch S7 to the closed state and setting the second switch S2 and the third switch S3 to the open state.

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 open-phase exists on the low-voltage side or not can be detected through the third current transformer TA3, whether open-phase exists on the high-voltage side 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 mistakes can be avoided, and the reliability of detection is ensured.

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

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

the output end of the second transformer T2 is connected to the input end of the fifth equipment group 25 through a tenth switch S10, and the output end of the second generator 12 of the nuclear power plant is connected to the input end of the fifth equipment group 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 the open state, and the seventh switch S7 and the eighth switch S8 are in the closed state;

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

in the case where the second off-plant auxiliary power supply supplies power to the fifth equipment group 25, the eleventh switch S11 is in the open state, and the tenth switch S10 is in the 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 usually more than one nuclear power plant generator in the plant, and a plurality of nuclear power plant generators can supply power to the plant equipment instead. Different nuclear power station generators correspond to different in-plant equipment, the in-plant equipment is divided according to the number of the nuclear power station generators, and then power supply is carried out. 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. Under the condition that different nuclear power station generators supply power, the condition that the different nuclear power station generators are abnormal needs to be considered, and in the condition, when an off-plant auxiliary power supply needs to be adopted for supplying power, only in-plant equipment corresponding to the abnormal nuclear power station generator is required to be supplied with power. For example, a first off-plant 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-plant auxiliary power supply supplies power to the fourth device group 24 or the fifth device group 25.

In the present 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 also power supply sections such as the first off-plant auxiliary power supply, the second off-plant auxiliary power supply, the first power generator 11 of the nuclear power plant, and the second power generator 12 of the nuclear power plant, and different power supply sections and different electric devices have different power supply situations. It can be understood that the power is supplied by the first generator 11 or the second generator 12, and the first off-plant auxiliary power supply or the second off-plant auxiliary power supply is used for auxiliary power supply when the first generator 11 or the second generator 12 cannot supply power.

In the case where the first off-plant auxiliary power supply supplies power to the fourth device group 24, the ninth switch S9 is set to the open state, and the seventh switch S7 and the eighth switch S8 are set to the closed state; when the second plant-external auxiliary power supply supplies power to the fourth device group 24, the seventh switch S7 and the ninth switch S9 are set to the open state, and the eighth switch S8 is set to the 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 the open state, and the ninth switch S9 is set to the closed state; when the second plant-outside auxiliary power supply supplies power to the fifth device group 25, the eleventh switch S11 is turned off, and the tenth switch S10 is turned on; when the second generator 12 of the nuclear power plant supplies power to the fifth equipment group 25, the tenth switch S10 is opened, and the eleventh switch S11 is closed.

In addition, in order to improve the safety of the system, the system is also provided with a twenty-eighth switch S28, a twenty-ninth switch S29 and a thirty-third 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-third switch S30 is provided between the eighth switch S8 and the input of the fourth device group 24, and a thirty-third switch S30 is further provided between the ninth switch S9 and the input of the fourth device group 24. Wherein the states of the twenty-eighth switch S28 and the eighth switch S8 remain the same in the case of no short circuit, and the states of the twenty-ninth switch S29 and the tenth switch S10 remain the same. While any one of the eighth switch S8 or the ninth switch S9 remains in a closed state, the thirtieth switch S30 remains in a closed state; when the eighth switch S8 and the ninth switch S9 are set to the off state, the thirtieth switch S30 is set to the off state. By arranging the twenty-eighth switch S28 and the twenty-ninth switch S29, the situation that the eighth switch S8 and the tenth switch S10 are abnormally incapable of being normally switched off is prevented from causing a short circuit of the system.

As an optional embodiment, the system further includes a sixth device group 26, the output terminal of the fourth device group 24 is connected to the input terminal of the sixth device group 26 through a twelfth switch S12, and the output terminal of the second transformer T2 is connected to the input terminal of the sixth device group 26 through a tenth switch S13;

in the case of testing whether there is an open phase in the loop of the second transformer T2 through the sixth device 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 an open phase in the loop of the first transformer T1 through 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 source, the second off-plant auxiliary power source, 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 the present embodiment, the devices in the sixth device group 26 are non-safety level devices in the plant, and the purpose of the device is similar to that of the second device group 22, and the open-phase test on the second transformer T2 is implemented by splitting a few non-safety level devices in the plant. The second transformer T2 and the first transformer T1 are auxiliary transformers. In the present embodiment, in the case where it is tested whether or not there is an open phase in the loop of the second transformer T2 by the sixth device group 26, 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. The sixth equipment group 26 may be configured to test whether the first transformer T1 is open-phase, and when the sixth equipment group 26 tests whether the circuit of the first transformer T1 is open-phase, 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 phase-loss test is not required, the twelfth switch S12 is closed, the thirteenth switch S13 is opened, and the sixth equipment group 26 and the fourth equipment group 24 are integrated and supplied with power from the first off-plant auxiliary power supply, the second off-plant auxiliary power supply, or the nuclear power plant second generator 12.

In addition, in order to improve the safety of the system, a thirty-first switch S31 is further provided in the system, a thirty-first switch S31 is provided between the output end of the second transformer T2 and the thirteenth switch S13, and when a short circuit does not occur, the thirty-first switch S31 and the thirteenth switch S13 are kept in the same state, thereby preventing the occurrence of a system short circuit when the thirteenth switch S13 is abnormally not normally opened.

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 group 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 group 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 group 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 group 28 through a seventeenth switch S17;

when 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 offboard auxiliary power supply supplies power to the seventh equipment group 27, the fourteenth switch S14 is in the open state and the fifteenth switch S15 is in the 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 the closed state and the seventeenth switch S17 is in the 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 the open state and the seventeenth switch S17 is in the closed state.

In this embodiment, it is considered that the third device group 23 and the fifth device group 25 are security level devices, and have higher importance, and an abnormality that cannot work cannot occur. However, except for the power failure of the equipment, other problems also need to be considered to cause the equipment to be incapable of working normally, so that 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.

Among them, the seventh device group 27 is a spare group of the third device group 23, and a difference is made in the power supply manner to improve the reliability of power supply. Wherein the third equipment group 23 is typically powered by the first power generator 11 of the nuclear power plant or a first off-plant auxiliary power source, and the seventh equipment group 27 is typically powered by the first power generator 11 of the nuclear power plant or a second off-plant auxiliary power source. Similarly, the eighth equipment group 28 is a spare group of the fifth equipment group 25, and a difference is made in the power supply manner, wherein the fifth equipment group 25 is usually powered by the second generator 12 of the nuclear power plant or the second off-plant auxiliary power source, and the eighth equipment group 28 is usually powered by the second generator 12 of the nuclear power plant or the first off-plant auxiliary power source, so that the reliability of power supply is improved.

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 no short circuit occurs, the thirty-second switch S32 maintains the same state as the seventeenth switch S17, and the thirty-third switch S33 maintains the same state as the fifteenth switch S15. By arranging the thirty-second switch S32 and the thirty-third switch S33 in the system, the situation that the fifteenth switch S15 and the seventeenth switch S17 are abnormally incapable of being normally opened is prevented from causing short circuit of the system.

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

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

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

in the case where the first off-plant auxiliary power supply needs to be used for testing or power supply, the eighteenth switch S18 is in a closed state;

in the case where it is necessary to use the second off-plant auxiliary power source for testing or power supply, the nineteenth switch S19 is in a closed state.

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

Here, the eighteenth switch S18 is turned off when the test or the power supply using the first off-plant auxiliary power supply is not required. Similarly, when the test or the power supply using the second off-plant auxiliary power supply is not required, the nineteenth switch S19 is turned off.

In addition, in order to improve the safety of the system, a thirty-fourth switch S34 and a thirty-fifth switch S35 are further arranged in the system, wherein the thirty-fourth switch S34 is arranged between the input end of the first transformer T1 and the first off-plant auxiliary power supply, the thirty-fifth switch S35 is arranged between the input end of the second transformer T2 and the second off-plant auxiliary power supply, and the thirty-fourth switch S34 and the thirty-fifth switch S35 are normally set to be in a closed state; when the first off-plant auxiliary power supply is abnormal, the thirty fourth switch S34 is turned off; when the second off-plant auxiliary power supply is abnormal, the thirty-fifth switch S35 is turned off.

As an alternative embodiment, it further includes 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 group 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 plant 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 group 24 through a ninth switch S9;

the output end of the second generator 12 of the nuclear power plant 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 terminal of the sixth transformer T6 is also connected to the input terminal of the eighth device group 28 through a sixteenth switch S16.

In this embodiment, since the high voltage is transmitted from the first generator 11 of the nuclear power plant, the voltage needs to be controlled within the set voltage range of the first equipment group 21 and the second equipment group 22 by the third transformer T3; similarly, 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 service high voltage transformers. Similarly, the transformation requirement and the power supply requirement of the second generator 12 of the nuclear power plant need to be considered, and the fifth transformer T5 and the sixth transformer T6 are arranged to realize transformation, so that the second generator 12 of the nuclear power plant can realize stable power supply to the fourth equipment group 24, the fifth equipment group 25 and the sixth equipment group 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-fourth switch S40 and a forty-first switch S41 are also arranged in the system. A sixteenth switch S36 is disposed between the output of the third transformer T3 and the first switch S1, a seventeenth switch S37 is disposed between the output of the fourth transformer T4 and the fifth switch S5, a thirty-eighth switch S38 is disposed between the output of the fourth transformer T4 and the fourteenth switch S14, a thirty-ninth switch S39 is disposed between the output of the fifth transformer T5 and the ninth switch S9, a forty-fourth switch S40 is disposed between the output of the sixth transformer T6 and the eleventh switch S11, and a forty-first switch S41 is disposed between the output of the sixth transformer T6 and the sixteenth switch S16. When no short circuit occurs, the state of the sixteenth switch S36 and the state of the first switch S1 are kept consistent, the state of the seventeenth switch S37 and the state of the fifth switch S5 are kept consistent, the state of the thirty-eighth switch S38 and the state of the fourteenth switch S14 are kept consistent, the state of the thirty-ninth switch S39 and the state of the ninth switch S9 are kept consistent, the state of the forty-fourth switch S40 and the state of the eleventh switch S11 are kept consistent, and the state of the forty-first switch S41 and the state of the sixteenth switch S16 are kept consistent. By arranging the thirty-sixth switch S36, the thirty-seventh switch S37, the thirty-eighth switch S38, the thirty-ninth switch S39, the forty-fourth switch S40 and the forty-first switch S41, 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 are prevented from being abnormally and normally opened, so that the system is prevented from being short-circuited.

In addition, a forty-second switch S42 is further provided in the system, the forty-second switch S42 is provided before the input end of the first equipment group 21 and the output end of the fourth equipment group 24, and the first equipment group 21 and the fourth equipment group 24 can be integrated by setting the forty-second switch S42 to a closed state, so that power can be supplied by the first off-plant auxiliary power supply, the second off-plant auxiliary power supply, the first generator 11 of the nuclear power plant, or the second generator 12 of the nuclear power plant.

As an alternative embodiment, a first backup generator 31, a second backup generator 32, a third backup generator 33 and a fourth backup generator 34 are further included, an output of the first backup generator 31 is connected to an input of the third equipment group 23, an output of the second backup generator 32 is connected to an input of the fifth equipment group 25, an output of the third backup generator 33 is connected to an input of the seventh equipment group 27, and an output of the fourth backup generator 34 is connected to an input of the eighth equipment group 28.

In this embodiment, it is considered that the first generator 11 of the nuclear power plant and the first off-plant auxiliary power supply cannot supply power, and since the equipment of the third equipment group 23 cannot be powered off, an emergency power supply needs to be added for supplying power. In the present embodiment, the first backup generator 31 is provided as the emergency power source, and when the power cannot be supplied from both the first generator 11 and the first off-plant auxiliary power source in the nuclear power plant, 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 standby generator 32 supplies power to the fifth device group 25, the tenth switch S10 and the eleventh switch S11 are in the open state; in the case where the third standby generator 33 supplies power to the seventh device group 27, the fourteenth switch S14 and the fifteenth switch S15 are in the open state; in the case where the fourth standby generator 34 supplies power to the eighth equipment group 28, the sixteenth switch S16 and the seventeenth switch S17 are in an open state.

Among them, the first, second, third and fourth

backup generators

31, 32, 33 and 34 may be emergency diesel generators.

As an alternative embodiment, a fifth standby generator 35 is further included, the fifth standby generator 35 is connected to the input terminal of the third equipment group 23 through a twentieth switch S20, the fifth standby generator 35 is connected to the input terminal of the fifth equipment group 25 through a twenty-first switch S21, the fifth standby generator 35 is connected to the input terminal of the seventh equipment group 27 through a twenty-twelfth switch S22, and the fifth standby generator 35 is connected to the input terminal of the eighth equipment group 28 through a twenty-third switch S23;

in this embodiment, when the first backup generator 31 cannot supply power to the third device group 23, the second backup generator 32 cannot supply power to the fifth device group 25, the third backup generator 33 cannot supply power to the seventh device group 27, or the fourth backup generator 34 cannot supply power to the eighth device group 28, the fifth backup generator 35 is used to supply power, so as to meet the power supply requirement of the safety-level device.

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

In addition, a forty-fourth switch S43 and a forty-fourth switch S44 are provided in the system, wherein the forty-fourth switch S43 is provided between the fifth standby generator 35 and the twentieth switch S20, and the forty-fourth switch S43 is also provided between the fifth standby generator 35 and the twenty-second switch S22; a fourteenth switch S44 is provided between the fifth backup generator 35 and the twenty-first switch S21, and a fourteenth switch S44 is also provided between the fifth backup generator 35 and the twenty-third switch S23. In the case where the system is not short-circuited, if any one of the twentieth switch S20 or the twenty-second switch S22 is in the closed state, the forty-third switch S43 is in the closed state; with both the twentieth switch S20 and the twenty-second switch S22 in the off state, the forty-third switch S43 is in the off state. Similarly, in the case where the system is not short-circuited, when any one of the twenty-first switch S21 or the twenty-fourth switch S23 is in a closed state, the forty-fourth switch S44 is in a closed state; with both the twenty-first switch S21 and the twenty-fourth switch S23 in the open state, the forty-fourth switch S44 is in the open state. By arranging the forty-fourth switch S43 and the forty-fourth switch S44 in the system, the system is prevented from being short-circuited due to the fact that the twentieth switch S20, the twenty-first switch S21, the twenty-second switch S22 and the twenty-third switch S23 cannot be normally opened.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above description is for illustrative purposes only and is not intended to be limiting, and the present invention is not limited to the above embodiments, and many modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims

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

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 off-plant auxiliary power supply, and the signal end of the second current transformer is connected with a second relay protection device;

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

2. The nuclear power plant system wiring scheme of claim 1, further comprising a third equipment group, 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 nuclear power plant second generator, a fourth equipment group, and a fifth equipment group, wherein,

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

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

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

7. The nuclear power plant system wiring scheme of claim 6, wherein an eighteenth switch is provided at an output of the first transformer and a nineteenth switch is provided at an output of the second transformer, 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 inputs of the third equipment group by a twentieth switch, the fifth backup generator connected to the inputs of the fifth equipment group by a twenty-first switch, the fifth backup generator connected to the inputs of the seventh equipment group by a twenty-twelfth switch, the fifth backup generator connected to the inputs of the eighth equipment group by a twentieth switch.