A nuclear power plant system wiring system

Abstract

The application provides a nuclear power plant system wiring system, comprising a nuclear power plant first generator, a first device group, a second device group, a first transformer, a first current transformer and a second current transformer, the output end of the nuclear power plant first generator is connected with the input end of the first device group through a first switch, the output end of the first device group is connected with the input end of the second device 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 device group through a third switch, and the output end of the first transformer is connected with the input end of the second device group through a fourth switch. According to the embodiment, the loop test of the first transformer is carried out by splitting the second device group, 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 for testing, and whether the loop of the first transformer exists phase failure can be effectively detected through the second device group.

Description

Technical Field

[0001] This invention relates to the field of nuclear power technology, and more specifically to a nuclear power plant system wiring system. Background Technology

[0002] Nuclear power plants have a high safety level, and many auxiliary equipment within the plant requires continuous power supply. During normal operation, power is supplied to the plant equipment via generators. When the generator bus loses power, the power must be switched to an external auxiliary power source to ensure a safe shutdown. The auxiliary transformers are unloaded during normal operation, and phase-loss faults in the external auxiliary power circuit are difficult to detect using existing equipment, requiring routine inspections by maintenance personnel. However, routine inspections are susceptible to human error and may not promptly detect phase-loss faults, leading to lower safety levels in the auxiliary transformer and related systems.

[0003] It is evident that the related technologies suffer from low safety of auxiliary transformer systems. Summary of the Invention

[0004] This invention provides a nuclear power plant system wiring system to address the problem of low safety in related auxiliary transformer systems in the relevant technologies.

[0005] To achieve the above objectives, embodiments of the present invention provide a nuclear power plant system wiring system, comprising: a first generator, a first equipment group, a second equipment group, a first transformer, a first current transformer, and a second current transformer, wherein... The output terminal of the first generator of the nuclear power plant is connected to the input terminal of the first equipment group through a first switch, and the output terminal of the first equipment group is connected to the input terminal of the second equipment group through a second switch. The first transformer is equipped with the first current transformer at its output terminal. The output terminal of the first transformer is connected to the input terminal of the first equipment group through a third switch. The output terminal of the first transformer is also connected to the input terminal of the second equipment group through a fourth switch. The signal terminal of the first current transformer is connected to the first relay protection device. The input terminal of the first transformer is equipped with the second current transformer. The input terminal of the first transformer is connected to the first external auxiliary power supply, and the signal terminal of the second current transformer is connected to the second relay protection device. When testing the circuit of the first transformer for a phase break using the second equipment group, the second switch and the third switch are in the open state, and the first switch and the fourth switch are in the closed state. When 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 the closed state, and the third switch and the fourth switch are in the open state; When the first external auxiliary power supply is used to supply power to the first equipment group and the second equipment group through the first transformer, the second switch and the third switch are in the closed state, and the first switch and the fourth switch are in the open state. The first current transformer is used to control the first relay protection device to issue an alarm signal when a phase loss is detected at the output terminal of the first transformer, and the second current transformer is used to control the second relay protection device to issue an alarm signal when a phase loss is detected at the input terminal of the first transformer.

[0006] As an optional implementation, a third device group is also included, wherein, The output terminal of the first generator of the nuclear power plant is connected to the input terminal of the first equipment group through the first switch, and the output terminal of the first generator of the nuclear power plant is also connected to the input terminal of the third equipment group through the fifth switch; The output terminal of the first transformer is also connected to the input terminal of the third equipment group via a sixth switch; When 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 the closed state, and the third switch and the fourth switch are in the open state; When the first external 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 the open state, and the second switch and the third switch are in the closed state. When the first generator of the nuclear power plant supplies power to the third equipment group, the fifth switch is in the closed state and the sixth switch is in the open state; When the first external auxiliary power supply supplies power to the third equipment group through the first transformer, the fifth switch is in the open state and the sixth switch is in the closed state.

[0007] As an optional implementation, it also includes a second transformer, a third current transformer, and a fourth current transformer, wherein, The output terminal of the second transformer is equipped with the third current transformer. The output terminal of the second transformer is connected to the output terminal of the first transformer through the seventh switch. The signal terminal of the third current transformer is connected to the third relay protection device. The input terminal of the second transformer is equipped with the fourth current transformer. The input terminal of the second transformer is connected to the second external auxiliary power supply. The signal terminal of the fourth current transformer is connected to the fourth relay protection device. When testing the circuit of the second transformer for a phase loss using the second equipment group, the fourth and seventh switches are closed, while the second and third switches are open. When the second external auxiliary power supply supplies power to the first equipment group and the second equipment group, the first switch and the fourth switch are in the open state, and the second switch, the third switch and the seventh switch are in the closed state; The third current transformer is used to control the third relay protection device to issue an alarm signal when a phase loss is detected at the output terminal of the second transformer, and the fourth current transformer is used to control the fourth relay protection device to issue an alarm signal when a phase loss is detected at the input terminal of the second transformer.

[0008] As an optional implementation, the system also includes a second generator, a fourth equipment group, and a fifth equipment group of the nuclear power plant, wherein, The output terminal of the second transformer is connected to the input terminal of the fourth equipment group via the eighth switch, and the output terminal of the second generator of the nuclear power plant is connected to the input terminal of the fourth equipment group via the ninth switch; The output terminal of the second transformer is connected to the input terminal of the fifth equipment group via the tenth switch, and the output terminal of the second generator of the nuclear power plant is connected to the input terminal of the fifth equipment group via the eleventh switch. When the first external auxiliary power supply supplies power to the fourth equipment group, the ninth switch is in the open state, and the seventh and eighth switches are in the closed state. When the second external auxiliary power supply supplies power to the fourth equipment group, the seventh switch and the ninth switch are in the open state, and the eighth switch is in the 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 the open state, and the ninth switch is in the closed state; When the second external auxiliary power supply supplies power to the fifth equipment group, the eleventh switch is in the open state and the tenth switch is in the closed state; When the second generator of the nuclear power plant supplies power to the fifth equipment group, the tenth switch is in the open state and the eleventh switch is in the closed state.

[0009] As an optional implementation, a sixth equipment group is also included, wherein the output terminal of the fourth equipment group is connected to the input terminal of the sixth equipment group via a twelfth switch, and the output terminal of the second transformer is connected to the input terminal of the sixth equipment group via a thirteenth switch; When testing the circuit of the second transformer for a phase break using the sixth equipment group, the seventh, eighth, and twelfth switches are in the open state, and the thirteenth switch is in the closed state. When testing the circuit of the first transformer for a phase break using the sixth equipment group, the eighth and twelfth switches are in the open state, and the seventh and thirteenth switches are in the closed state. When the first external auxiliary power source, the second external auxiliary power source, or the second generator of the nuclear power plant is supplying power to the sixth equipment group normally, the twelfth switch is in the closed state, and the thirteenth switch is in the open state.

[0010] As an optional implementation, a seventh device group and an eighth device group are also included, wherein, The first generator of the nuclear power plant is connected to the input terminal of the seventh equipment group via the fourteenth switch, and the output terminal of the second transformer is connected to the input terminal of the seventh equipment group via the fifteenth switch; The second generator of the nuclear power plant is connected to the input terminal of the eighth equipment group through the sixteenth switch, and the output terminal of the first transformer is connected to the input terminal of the eighth equipment group through the seventeenth switch; In the event of an anomaly in the third equipment group and the first generator of the nuclear power plant supplying power to the seventh equipment group, the fourteenth switch is in the closed state and the fifteenth switch is in the open state. In the event of an malfunction in the third equipment group and the second external auxiliary power supply supplying power to the seventh equipment group, the fourteenth switch is in the open state and the fifteenth switch is in the closed state. In the event of an anomaly in the fifth equipment group and the second generator of the nuclear power plant supplying power to the eighth equipment group, the sixteenth switch is in the closed state and the seventeenth switch is in the open state. When the fifth equipment group malfunctions and the first external auxiliary power supply is supplying power to the eighth equipment group, the sixteenth switch is in the open state and the seventeenth switch is in the closed state.

[0011] As an optional implementation, the output terminal of the first transformer is provided with an eighteenth switch, and the output terminal of the second transformer is provided with a nineteenth switch, wherein... The output terminal of the first transformer is connected to the input terminal of the first equipment group in sequence through the eighteenth switch and the third switch; the output terminal of the first transformer is connected to the input terminal of the second equipment group in sequence through the eighteenth switch and the fourth switch; the output terminal of the first transformer is connected to the input terminal of the third equipment group in sequence through the eighteenth switch and the sixth switch; the output terminal of the first transformer is connected to the input terminal of the eighth equipment group in sequence through the eighteenth switch and the seventeenth switch; and the output terminal of the first transformer is connected to the output terminal of the second transformer in sequence through the eighteenth switch, the seventh switch, and the nineteenth switch. The output terminal of the second transformer is connected to the input terminal of the seventh equipment group in sequence through the nineteenth switch and the fifteenth switch; the output terminal of the second transformer is connected to the input terminal of the fourth equipment group in sequence through the nineteenth switch and the eighth switch; the output terminal of the second transformer is connected to the input terminal of the fifth equipment group in sequence through the nineteenth switch and the tenth switch; and the output terminal of the second transformer is connected to the input terminal of the seventh equipment group in sequence through the nineteenth switch and the fifteenth switch. When the first external auxiliary power supply is required for testing or power supply, the eighteenth switch is in the closed state; When the second external auxiliary power supply is required for testing or power supply, the nineteenth switch is in the closed state.

[0012] As an optional implementation, the system also includes a third transformer, a fourth transformer, a fifth transformer, and a sixth transformer, wherein, The output terminal of the first generator of the nuclear power plant is connected to the input terminal of the third transformer, and the output terminal of the third transformer is connected to the input terminal of the first equipment group through the first switch; The output terminal of the first generator of the nuclear power plant is connected to the input terminal of the fourth transformer. The output terminal of the fourth transformer is connected to the input terminal of the third equipment group through the fifth switch. The output terminal of the fourth transformer is also connected to the input terminal of the seventh equipment group through the fourteenth switch. The output terminal of the second generator of the nuclear power plant is connected to the input terminal of the fifth transformer, and the output terminal of the fifth transformer is connected to the input terminal of the fourth equipment group through the ninth switch; The output terminal of the second generator of the nuclear power plant is connected to the input terminal of the sixth transformer, and the output terminal of the sixth transformer is connected to the input terminal of the fifth equipment group through the eleventh switch; the output terminal of the sixth transformer is also connected to the input terminal of the eighth equipment group through the sixteenth switch.

[0013] As an optional implementation, it also includes a first backup generator, a second backup generator, a third backup generator, and a fourth backup generator, wherein, The output terminal of the first backup generator is connected to the input terminal of the third equipment group, the output terminal of the second backup generator is connected to the input terminal of the fifth equipment group, the output terminal of the third backup generator is connected to the input terminal of the seventh equipment group, and the output terminal of the fourth backup generator is connected to the input terminal of the eighth equipment group.

[0014] As an optional implementation, a fifth backup generator is also included. This fifth backup generator is connected to the input terminal of the third equipment group via a twentieth switch, to the input terminal of the fifth equipment group via a twentieth-first switch, to the input terminal of the seventh equipment group via a twentieth-second switch, and to the input terminal of the eighth equipment group via a twentieth-third switch. One of the above technical solutions has the following advantages or beneficial effects: This embodiment separates a second equipment group to test the circuit of the first transformer. The second and third switches are set to the open state, and the first and fourth switches are set to the closed state for testing. Without affecting the operation of the first equipment group, the second equipment group can effectively detect whether there is a phase loss in the circuit of the first transformer. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a nuclear power plant system wiring system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of another nuclear power plant system wiring system provided in an embodiment of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1 , Figure 1This is a schematic diagram of a nuclear power plant system wiring system provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the nuclear power plant system wiring system includes the first generator 11, the first equipment group 21, the second equipment group 22, the first transformer T1, the first current transformer TA1, and the second current transformer TA2. The output terminal of the first generator 11 of the nuclear power plant is connected to the input terminal of the first equipment group 21 through the first switch S1, and the output terminal of the first equipment group 21 is connected to the input terminal of the second equipment group 22 through the second switch S2. The output terminal of the first transformer T1 is equipped with a first current transformer TA1. The output terminal of the first transformer T1 is connected to the input terminal of the first equipment group 21 through the third switch S3. The output terminal of the first transformer T1 is also connected to the input terminal of the second equipment group 22 through the fourth switch S4. The signal terminal of the first current transformer TA1 is connected to the first relay protection device. The input terminal of the first transformer T1 is equipped with a second current transformer TA2. The input terminal of the first transformer T1 is connected to the first external auxiliary power supply, and the signal terminal of the second current transformer TA2 is connected to the second relay protection device. When testing the circuit of the first transformer T1 for a phase break by the second equipment group 22, the second switch S2 and the third switch S3 are in the open state, and the first switch S1 and the fourth switch S4 are in the closed state. When 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 the closed state, and the third switch S3 and the fourth switch S4 are in the open state. When the first external auxiliary power supply is used to supply power to the first equipment group 21 and the second equipment group 22 through the first transformer T1, the second switch S2 and the third switch S3 are in the closed state, and the first switch S1 and the fourth switch S4 are in the open state. The first current transformer TA1 is used to control the first relay protection device to issue an alarm signal when a phase loss is detected at the output terminal of the first transformer T1, and the second current transformer TA2 is used to control the second relay protection device to issue an alarm signal when a phase loss is detected at the input terminal of the first transformer T1.

[0019] In this embodiment, the circuit test of the first transformer T1 is performed by separating the second equipment group 22. 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 for testing. While not affecting the operation of the first equipment group 21, the second equipment group 22 can effectively detect whether there is a phase break in the circuit of the first transformer T1. 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, under normal operating conditions in the plant, the first switch S1 and the second switch S2 are in the closed state, and the third switch S3 and the fourth switch S4 are in the open state. The first generator 11 of the nuclear power plant supplies power to the first equipment group 21 through the first switch S1. At the same time, the second equipment group 22 and the first equipment group 21 are connected through the second switch S2, which enables the first generator 11 of the nuclear power plant to supply power to the second equipment group 22.

[0020] In addition, when it is necessary to perform phase loss detection on the circuit 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. At this time, the first generator 11 of the nuclear power plant can supply power to the first equipment group 21 normally without being affected. At the same time, the first external auxiliary power supply supplies power to the second equipment group 22. At this time, both sides of the first transformer T1 are energized, and the current is within the detection range of the first current transformer TA1 and the second current transformer TA2. This can effectively detect whether there is a phase loss in the relevant system of the first transformer T1.

[0021] In this system, the input terminal of the first transformer T1 is the high-voltage side, and the output terminal is the low-voltage side. The first current transformer TA1 can detect whether there is a phase loss on the low-voltage side, and the second current transformer TA2 can detect whether there is a phase loss on the high-voltage side, improving the efficiency of maintenance personnel in troubleshooting. Simultaneously, the signal terminal of the first current transformer TA1 is connected to the first relay protection device, and the signal terminal of the second current transformer TA2 is connected to the second relay protection device. When a phase loss is detected, an alarm signal is issued, preventing human error and ensuring the reliability of the detection.

[0022] Specifically, when the first relay protection device issues an alarm signal, it can be assumed that a phase loss has occurred on the low-voltage side of the first transformer T1. At this time, maintenance personnel can troubleshoot according to the fault investigation plan for the low-voltage side. Correspondingly, if the second relay protection device issues an alarm signal, maintenance personnel can troubleshoot according to the fault investigation plan for the high-voltage side.

[0023] Among them, the first equipment group 21 and the second equipment group 22 are non-safety-grade equipment within the plant. They will not affect the normal operation of the unit in the event of a power outage and can be well used for phase-loss testing of the first transformer T1. At the same time, the number of plant-based equipment in the second equipment 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, while reducing the energy loss caused by periodic testing.

[0024] Considering the safety of nuclear power plants, it is necessary to select circuit breakers as the type of switches in nuclear power plants, which can automatically disconnect the wiring when a short circuit occurs in the equipment or area of ​​the nuclear power plant.

[0025] In addition, to improve power supply security, the system is also equipped with a 24th switch S24, a 25th switch S25, and a 26th switch S26, such as... Figure 1 As shown, the twenty-fourth switch S24 is located between the output terminal of the first transformer T1 and the third switch S3; the twenty-fifth switch S25 is located between the input terminal of the first transformer T1 and the fourth switch S4; and the twenty-sixth switch S26 is located between the first switch S1 and the input of the first equipment group 21, and also between the third switch S3 and the first equipment group 21. When either the first switch S1 or the third switch S3 is closed, the twenty-sixth switch S26 is closed; when both the first switch S1 and the third switch S3 are open, the twenty-sixth switch S26 is open. In the absence of a short circuit, the state of the twenty-fourth switch S24 is consistent with the state of the third switch S3, and the state of the twenty-fifth switch S25 is consistent with the state of the fourth switch S4. By setting the twenty-fourth switch S24 and the twenty-fifth switch S25, a short circuit in the system is prevented due to the first switch S1 and the fourth switch S4 failing to open properly.

[0026] As an optional implementation method, such as Figure 2 As shown, it also includes a third equipment group 23, in which, The output terminal of the first generator 11 of the nuclear power plant is connected to the input terminal of the first equipment group 21 through the first switch S1, and the output terminal of the first generator 11 of the nuclear power plant is also connected to the input terminal of the third equipment group 23 through the fifth switch S5. The output terminal of the first transformer T1 is also connected to the input terminal of the third equipment group 23 via the sixth switch S6; When 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 the closed state, and the third switch S3 and the fourth switch S4 are in the open state. When the auxiliary power supply from outside the first plant 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 the open state, and the second switch S2 and the third switch S3 are in the closed state. When 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. When the auxiliary power supply from the first plant is supplying power to the third equipment group 23 through the first transformer T1, the fifth switch S5 is in the open state and the sixth switch S6 is in the closed state.

[0027] In this embodiment, the third equipment group 23 is a safety-grade device within the nuclear power plant, with high safety requirements. A power outage could lead to serious consequences such as core damage. Therefore, from a safety design perspective, it is necessary to ensure that the third equipment group 23 does not experience a power outage. In this embodiment, under normal circumstances, the first generator 11 of the nuclear power plant operates normally. At this time, the fifth switch S5 is set to the closed state, and the sixth switch S6 is set to the open state. If the first generator 11 malfunctions and cannot supply power to the third equipment group 23, the first external auxiliary power supply supplies power to the third equipment group 23 through the first transformer T1. In this case, the fifth switch S5 is set to the open state, and the sixth switch S6 is set to the closed state to achieve long-term power supply to the third equipment group 23.

[0028] In addition, to improve system safety, a twenty-seventh switch S27 is provided, located between the output terminal of the first transformer T1 and the sixth switch S6. The twenty-seventh switch S27 is used to prevent a short circuit caused by the sixth switch S6 failing to disconnect properly.

[0029] As an optional implementation, it also includes a second transformer T2, a third current transformer TA3, and a fourth current transformer TA4, wherein, The output terminal of the second transformer T2 is equipped with a third current transformer TA3. The output terminal of the second transformer T2 is connected to the output terminal of the first transformer T1 through the seventh switch S7. The signal terminal of the third current transformer TA3 is connected to the third relay protection device. The input terminal of the second transformer T2 is equipped with a fourth current transformer TA4. The input terminal of the second transformer T2 is connected to the second external auxiliary power supply, and the signal terminal of the fourth current transformer TA4 is connected to the fourth relay protection device. When testing the circuit of the second transformer T2 for a phase break through the second equipment group 22, the fourth switch S4 and the seventh switch S7 are closed, and the second switch S2 and the third switch S3 are open. When the auxiliary power supply from the second plant is supplying power to the first equipment group 21 and the second equipment 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 issue an alarm signal when a phase loss is detected at the output terminal of the second transformer T2. The fourth current transformer TA4 is used to control the fourth relay protection device to issue an alarm signal when a phase loss is detected at the input terminal of the second transformer T2.

[0030] In this embodiment, there is usually more than one external auxiliary power source within the plant. Multiple external auxiliary power sources can effectively ensure that the equipment in the first equipment group 21, the second equipment group 22, and the third equipment group 23 within the plant experiences power outages as little as possible, thus improving the stability of the power supply. This embodiment adds an additional external auxiliary power source, namely a second external auxiliary power source. Specifically, when the second external auxiliary power source supplies power to the first equipment group 21 and the second equipment group 22, the first switch S1 and the fourth switch S4 are set to the open state, while the second switch S2, the third switch S3, and the seventh switch S7 are set to the closed state.

[0031] Since a second external auxiliary power supply is added, a phase loss test is required for the relevant system, specifically for the input and output terminals of the second transformer T2. In this embodiment, when testing for phase loss in the circuit of the second transformer T2 using the second equipment group 22, the fourth switch S4 and the seventh switch S7 are set to the closed state, while the second switch S2 and the third switch S3 are set to the open state. The phase loss test of the circuit of the second transformer T2 is then performed using the second equipment group 22.

[0032] The input terminal of the second transformer T2 is the high-voltage side, and the output terminal is the low-voltage side. The third current transformer TA3 can detect whether there is a phase loss on the low-voltage side, and the fourth current transformer TA4 can detect whether there is a phase loss on the high-voltage side, improving the efficiency of maintenance personnel in troubleshooting. Simultaneously, the signal terminals of the third current transformer TA3 and the fourth current transformer TA4 are connected to the third relay protection device, issuing an alarm signal when a phase loss is detected, preventing human error and ensuring the reliability of the detection.

[0033] As an optional implementation, the system also includes a second generator 12, a fourth equipment group 24, and a fifth equipment group 25 of the nuclear power plant, wherein, The output terminal of the second transformer T2 is connected to the input terminal of the fourth equipment group 24 through the eighth switch S8, and the output terminal of the second generator 12 of the nuclear power plant is connected to the input terminal of the fourth equipment group 24 through the ninth switch S9. The output terminal of the second transformer T2 is connected to the input terminal of the fifth equipment group 25 through the tenth switch S10, and the output terminal of the second generator 12 of the nuclear power plant is connected to the input terminal of the fifth equipment group 25 through the eleventh switch S11. When the auxiliary power supply from the first plant is supplying 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. When the auxiliary power supply from the second plant is supplying 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. 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 in the open state, and the ninth switch S9 is in the closed state. When the auxiliary power supply from the second plant is supplying 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. When the second generator 12 of the nuclear power plant supplies power to the fifth equipment group 25, the tenth switch S10 is in the open state and the eleventh switch S11 is in the closed state.

[0034] In this embodiment, there is typically more than one nuclear power plant generator within the plant, and these generators can alternately supply power to the plant's equipment. Different generators correspond to different equipment within the plant, and the equipment is divided according to the number of generators before power supply. For example, the first generator 11 supplies power to the first equipment group 21, the second equipment group 22, and the third equipment group 23, while the second generator 12 supplies power to the fourth equipment group 24 and the fifth equipment group 25. When different generators are supplying power, the possibility of generator malfunctions needs to be considered. In such cases, when external auxiliary power is required, power is supplied only to the equipment corresponding to the malfunctioning generator. For example, the first external auxiliary power supply supplies power to the first equipment group 21, the second equipment group 22, or the third equipment group 23, while the second external auxiliary power supply supplies power to the fourth equipment group 24 or the fifth equipment group 25.

[0035] In this embodiment, there are electrical equipment such as the first equipment group 21, the second equipment group 22, the third equipment group 23, the fourth equipment group 24, and the fifth equipment group 25. There are also power supply components such as the first external auxiliary power supply, the second external auxiliary power supply, the first generator 11 of the nuclear power plant, and the second generator 12 of the nuclear power plant. Different power supply components and different electrical equipment have different power supply situations. It is understood that initially, the first generator 11 or the second generator 12 of the nuclear power plant is used for power supply. If the first generator 11 or the second generator 12 of the nuclear power plant cannot provide power, the first external auxiliary power supply or the second external auxiliary power supply is used for auxiliary power supply.

[0036] Specifically, when the auxiliary power supply from the first plant is supplying power to the fourth equipment group 24, switch S9 is set to the open state, and switches S7 and S8 are set to the closed state; when the auxiliary power supply from the second plant is supplying power to the fourth equipment group 24, switches S7 and S9 are set to the open state, and switch S8 is set to the closed state; when the second generator 12 of the nuclear power plant is supplying power to the fourth equipment group 24, switches S7 and S8 are set to the open state, and switch S9 is set to the closed state; when the auxiliary power supply from the second plant is supplying power to the fifth equipment group 25, switch S11 is set to the open state, and switch S10 is set to the closed state; when the second generator 12 of the nuclear power plant is supplying power to the fifth equipment group 25, switch S10 is set to the open state, and switch S11 is set to the closed state.

[0037] In addition, to improve system safety, the system also includes a 28th switch S28, a 29th switch S29, and a 30th switch S30. The 28th switch S28 is located between the output terminal of the second transformer T2 and the 8th switch S8; the 29th switch S29 is located between the output terminal of the second transformer T2 and the 10th switch S10; and the 30th switch S30 is located between the 8th switch S8 and the input terminal of the fourth equipment group 24, and also between the 9th switch S9 and the input terminal of the fourth equipment group 24. When there is no short circuit, the 28th switch S28 maintains the same state as the 8th switch S8, and the 29th switch S29 maintains the same state as the 10th switch S10. When either the 8th switch S8 or the 9th switch S9 remains closed, the 30th switch S30 remains closed; when both the 8th switch S8 and the 9th switch S9 are open, the 30th switch S30 is open. By setting the 28th switch S28 and the 29th switch S29, a short circuit in the system can be prevented if the 8th switch S8 and the 10th switch S10 fail to disconnect properly.

[0038] As an optional implementation, it also 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 the 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 the thirteenth switch S13; When testing the circuit of the second transformer T2 for a phase break through the sixth equipment group 26, the seventh switch S7, the eighth switch S8 and the twelfth switch S12 are in the open state, and the thirteenth switch S13 is in the closed state. When testing the circuit of the first transformer T1 for a phase break through the sixth equipment group 26, the eighth switch S8 and the twelfth switch S12 are in the open state, and the seventh switch S7 and the thirteenth switch S13 are in the closed state. When the auxiliary power supply from the first external power source, the second external power source, or the second generator 12 of the nuclear power plant is supplying power to the sixth equipment group 26 normally, the twelfth switch S12 is in the closed state, and the thirteenth switch S13 is in the open state.

[0039] In this embodiment, the equipment in the sixth equipment group 26 is non-safety-grade equipment within the plant. Its purpose is similar to that of the second equipment group 22: to separate a few non-safety-grade equipment within the plant to achieve phase-loss testing of the second transformer T2. Both the second transformer T2 and the first transformer T1 are auxiliary transformers. In this embodiment, when testing the circuit of the second transformer T2 for phase loss using the sixth equipment 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. Alternatively, the sixth equipment group 26 can also be used to test the circuit of the first transformer T1 for phase loss. When testing the circuit of the first transformer T1 for phase loss using the sixth equipment group 26, the eighth switch S8 and the twelfth switch S12 are set to the open state, and the seventh switch S7 and the thirteenth switch S13 are set to the closed state.

[0040] In addition, when a phase loss test is not required, the twelfth switch S12 is set to the closed state and the thirteenth switch S13 is set to the open state. The sixth equipment group 26 and the fourth equipment group 24 form a whole and are powered by the first external auxiliary power supply, the second external auxiliary power supply or the second generator 12 of the nuclear power plant.

[0041] In addition, to improve system safety, a 31st switch S31 is also provided in the system. The 31st switch S31 is located between the output terminal of the second transformer T2 and the 13th switch S13. In the absence of a short circuit, the 31st switch S31 and the 13th switch S13 keep the same state to prevent the 13th switch S13 from failing to disconnect properly and causing a short circuit in the system.

[0042] As an optional implementation, it also includes a seventh device group 27 and an eighth device group 28, wherein, The first generator 11 of the nuclear power plant is connected to the input terminal of the seventh equipment group 27 through the fourteenth switch S14, and the output terminal of the second transformer T2 is connected to the input terminal of the seventh equipment group 27 through the fifteenth switch S15. The second generator 12 of the nuclear power plant is connected to the input terminal of the eighth equipment group 28 through the sixteenth switch S16, and the output terminal of the first transformer T1 is connected to the input terminal of the eighth equipment group 28 through the seventeenth switch S17. In the event of an anomaly in the third equipment group 23 and the first generator 11 of the nuclear power plant supplying power to the seventh equipment group 27, the fourteenth switch S14 is in the closed state and the fifteenth switch S15 is in the open state. When the third equipment group 23 malfunctions and the second external 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 event of an anomaly in the fifth equipment group 25 and the second generator 12 of the nuclear power plant supplying 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. When the fifth equipment group 25 malfunctions and the first external auxiliary power supply is supplying 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.

[0043] In this embodiment, considering that both the third equipment group 23 and the fifth equipment group 25 are safety-grade devices with high importance, they cannot be allowed to malfunction. However, in addition to power outages, other issues that could cause the devices to malfunction need to be considered, therefore, backup equipment is required for emergency supplementation. This embodiment provides a seventh equipment group 27 as a backup for the third equipment group 23, and an eighth equipment group 28 as a backup for the fifth equipment group 25.

[0044] Among them, the seventh equipment group 27 serves as a backup to the third equipment group 23, and its power supply method is differentiated to improve power supply reliability. The third equipment group 23 is typically powered by the first generator 11 of the nuclear power plant or the first external auxiliary power source, while the seventh equipment group 27 is typically powered by the first generator 11 of the nuclear power plant or the second external auxiliary power source. Similarly, the eighth equipment group 28 serves as a backup to the fifth equipment group 25, and its power supply method is also differentiated. The fifth equipment group 25 is typically powered by the second generator 12 of the nuclear power plant or the second external auxiliary power source, while the eighth equipment group 28 is typically powered by the second generator 12 of the nuclear power plant or the first external auxiliary power source, thus improving power supply reliability.

[0045] In addition, to improve system safety, the system also includes a 32nd switch S32 and a 33rd switch S33. Switch S32 is located between the output terminal of the first transformer T1 and the 17th switch S17, while switch S33 is located between the output terminal of the second transformer T2 and the 15th switch S15. In the absence of a short circuit, switch S32 and switch S17 maintain the same state, and switch S33 and switch S15 maintain the same state. The inclusion of switches S32 and S33 prevents short circuits caused by the malfunction of switches S15 and S17 failing to disconnect properly.

[0046] As an optional implementation, 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... The output terminal of the first transformer T1 is connected to the input terminal of the first equipment group 21 in sequence through the eighteenth switch S18 and the third switch S3. The output terminal of the first transformer T1 is connected to the input terminal of the second equipment group 22 in sequence through the eighteenth switch S18 and the fourth switch S4. The output terminal of the first transformer T1 is connected to the input terminal of the third equipment group 23 in sequence through the eighteenth switch S18 and the sixth switch S6. The output terminal of the first transformer T1 is connected to the input terminal of the eighth equipment group 28 in sequence through the eighteenth switch S18 and the seventeenth switch S17. The output terminal of the first transformer T1 is connected to the output terminal of the second transformer T2 in sequence through the eighteenth switch S18, the seventh switch S7 and the nineteenth switch S19. The output terminal of the second transformer T2 is connected to the input terminal of the seventh equipment group 27 in sequence through the nineteenth switch S19 and the fifteenth switch S15. The output terminal of the second transformer T2 is connected to the input terminal of the fourth equipment group 24 in sequence through the nineteenth switch S19 and the eighth switch S8. The output terminal of the second transformer T2 is connected to the input terminal of the fifth equipment group 25 in sequence through the nineteenth switch S19 and the tenth switch S10. The output terminal of the second transformer T2 is connected to the input terminal of the seventh equipment group 27 in sequence through the nineteenth switch S19 and the fifteenth switch S15. When it is necessary to use the external auxiliary power supply of the first factory for testing or power supply, the eighteenth switch S18 is in the closed state. When a second external auxiliary power supply is required for testing or power supply, the nineteenth switch S19 is in the closed state.

[0047] In this embodiment, since many devices are connected to the output terminals of the first transformer T1 and the second transformer T2, in order to prevent a short circuit of the entire system caused by the malfunction of 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.

[0048] Specifically, when testing or power supply from the first external auxiliary power source is not required, the eighteenth switch S18 is set to the open state. Similarly, when testing or power supply from the second external auxiliary power source is not required, the nineteenth switch S19 is set to the open state.

[0049] In addition, to improve system safety, the system is equipped with a 34th switch S34 and a 35th switch S35. The 34th switch S34 is located between the input terminal of the first transformer T1 and the first external auxiliary power supply, and the 35th switch S35 is located between the input terminal of the second transformer T2 and the second external auxiliary power supply. Normally, the 34th switch S34 and the 35th switch S35 are in the closed state. In the event of an abnormality in the first external auxiliary power supply, the 34th switch S34 is set to the open state; in the event of an abnormality in the second external auxiliary power supply, the 35th switch S35 is set to the open state.

[0050] As an optional implementation, it also includes a third transformer T3, a fourth transformer T4, a fifth transformer T5, and a sixth transformer T6, wherein, The output terminal of the first generator 11 of the nuclear power plant is connected to the input terminal of the third transformer T3, and the output terminal of the third transformer T3 is connected to the input terminal of the first equipment group 21 through the first switch S1; The output terminal of the first generator 11 of the nuclear power plant is connected to the input terminal of the fourth transformer T4. The output terminal of the fourth transformer T4 is connected to the input terminal of the third equipment group 23 through the fifth switch S5. The output terminal of the fourth transformer T4 is also connected to the input terminal of the seventh equipment group 27 through the fourteenth switch S14. The output terminal of the second generator 12 of the nuclear power plant is connected to the input terminal of the fifth transformer T5, and the output terminal of the fifth transformer T5 is connected to the input terminal of the fourth equipment group 24 through the ninth switch S9; The output terminal of the second generator 12 of the nuclear power plant is connected to the input terminal of the sixth transformer T6. The output terminal of the sixth transformer T6 is connected to the input terminal of the fifth equipment group 25 through the eleventh switch S11. The output terminal of the sixth transformer T6 is also connected to the input terminal of the eighth equipment group 28 through the sixteenth switch S16.

[0051] In this embodiment, since the first generator 11 of the nuclear power plant supplies high-voltage electricity, the voltage needs to be controlled within the set voltage range of the first equipment group 21 and the second equipment group 22 through the third transformer T3; similarly, the voltage needs to be controlled within the set voltage range of the third equipment group 23 through the fourth transformer T4. The third transformer T3 and the fourth transformer T4 are high-voltage transformers for plant use. The transformation and power supply requirements of the second generator 12 of the nuclear power plant also need to be considered. Transformation is achieved by setting the fifth transformer T5 and the sixth transformer T6, enabling the second generator 12 of the nuclear power plant to achieve a stable power supply to the fourth equipment group 24, the fifth equipment group 25, and the sixth equipment group 26.

[0052] In addition, to improve system safety, the system is also equipped with the following switches: 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 forty-first switch S41. Specifically, the thirty-sixth switch S36 is located between the output terminal of the third transformer T3 and the first switch S1; the thirty-seventh switch S37 is located between the output terminal of the fourth transformer T4 and the fifth switch S5; the thirty-eighth switch S38 is located between the output terminal of the fourth transformer T4 and the fourteenth switch S14; the thirty-ninth switch S39 is located between the output terminal of the fifth transformer T5 and the ninth switch S9; the fortieth switch S40 is located between the output terminal of the sixth transformer T6 and the eleventh switch S11; and the forty-first switch S41 is located between the output terminal of the sixth transformer T6 and the sixteenth switch S16. In the absence of a short circuit, the state of switch S36 is consistent with that of switch S1, the state of switch S37 is consistent with that of switch S5, the state of switch S38 is consistent with that of switch S14, the state of switch S39 is consistent with that of switch S9, the state of switch S40 is consistent with that of switch S11, and the state of switch S41 is consistent with that of switch S16. By setting switches S36, S37, S38, S39, S39, S40, and S41, a short circuit in the system can be prevented if switches S1, S5, S9, S9, S11, S14, and S16 fail to disconnect properly.

[0053] In addition, the system is equipped with a forty-second switch S42. The forty-second switch S42 is located before the input terminal of the first equipment group 21 and the output terminal of the fourth equipment group 24. Setting the forty-second switch S42 to the closed state can make the first equipment group 21 and the fourth equipment group 24 form a whole, which can be powered by the first external auxiliary power supply, the second external auxiliary power supply, the first generator 11 of the nuclear power plant, or the second generator 12 of the nuclear power plant.

[0054] As an optional implementation, it also includes a first backup generator 31, a second backup generator 32, a third backup generator 33, and a fourth backup generator 34. The output terminal of the first backup generator 31 is connected to the input terminal of the third equipment group 23, the output terminal of the second backup generator 32 is connected to the input terminal of the fifth equipment group 25, the output terminal of the third backup generator 33 is connected to the input terminal of the seventh equipment group 27, and the output terminal of the fourth backup generator 34 is connected to the input terminal of the eighth equipment group 28.

[0055] In this embodiment, a scenario is considered where neither the first generator 11 of the nuclear power plant nor the first external auxiliary power supply can provide power. Since the equipment in the third equipment group 23 cannot be powered off, an emergency power supply is required. This embodiment provides a first standby generator 31 as an emergency power supply. When neither the first generator 11 of the nuclear power plant nor the first external auxiliary power supply can provide power, the fifth switch S5 and the sixth switch S6 are set to the open state, and the first standby generator 31 supplies power to the third equipment group 23.

[0056] Similarly, when the second backup generator 32 supplies power to the fifth equipment group 25, the tenth switch S10 and the eleventh switch S11 are in the open state; when the third backup generator 33 supplies power to the seventh equipment group 27, the fourteenth switch S14 and the fifteenth switch S15 are in the open state; when the fourth backup generator 34 supplies power to the eighth equipment group 28, the sixteenth switch S16 and the seventeenth switch S17 are in the open state.

[0057] Among them, the first backup generator 31, the second backup generator 32, the third backup generator 33 and the fourth backup generator 34 can be emergency diesel generators.

[0058] As an optional implementation, it also includes a fifth backup generator 35, which is connected to the input terminal of the third equipment group 23 via the twentieth switch S20, the input terminal of the fifth equipment group 25 via the twenty-first switch S21, the input terminal of the seventh equipment group 27 via the twenty-second switch S22, and the input terminal of the eighth equipment group 28 via the twenty-third switch S23; In this embodiment, if the first backup generator 31 is unable to supply power to the third equipment group 23, or the second backup generator 32 is unable to supply power to the fifth equipment group 25, or the third backup generator 33 is unable to supply power to the seventh equipment group 27, or the fourth backup generator 34 is unable to supply power to the eighth equipment group 28, the fifth backup generator 35 is used to supply power to meet the power supply requirements of the safety-level equipment.

[0059] Specifically, when the fifth backup generator 35 supplies power to the third equipment group 23, the twentieth switch S20 is in the closed state; when the fifth backup generator 35 supplies power to the fifth equipment group 25, the twenty-first switch S21 is in the closed state; when the fifth backup generator 35 supplies power to the seventh equipment group 27, the twenty-second switch S22 is in the closed state; and when the fifth backup generator 35 supplies power to the eighth equipment group 28, the twenty-third switch S23 is in the closed state.

[0060] In addition, the system also includes a forty-third switch S43 and a forty-fourth switch S44. The forty-third switch S43 is located between the fifth backup generator 35 and the twentieth switch S20, and is also located between the fifth backup generator 35 and the twenty-second switch S22. The forty-fourth switch S44 is located between the fifth backup generator 35 and the twenty-first switch S21, and is also located between the fifth backup generator 35 and the twenty-third switch S23. When no short circuit occurs, if either the twentieth switch S20 or the twenty-second switch S22 is closed, the forty-third switch S43 is closed; if both the twentieth switch S20 and the twenty-second switch S22 are open, the forty-third switch S43 is open. Similarly, when no short circuit occurs, if either the twenty-first switch S21 or the twenty-third switch S23 is closed, the forty-fourth switch S44 is closed; if both the twenty-first switch S21 and the twenty-third switch S23 are open, the forty-fourth switch S44 is open. By setting the forty-third switch S43 and the forty-fourth switch S44 in the system, a short circuit in the system can be prevented if the twentieth switch S20, the twenty-first switch S21, the twenty-second switch S22, and the twenty-third switch S23 fail to disconnect properly.

[0061] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0062] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A nuclear power plant system wiring system, characterized in that, include: The nuclear power plant includes a first generator, a first equipment group, a second equipment group, a first transformer, a first current transformer, and a second current transformer. The output terminal of the first generator of the nuclear power plant is connected to the input terminal of the first equipment group through a first switch, and the output terminal of the first equipment group is connected to the input terminal of the second equipment group through a second switch. The first transformer is equipped with the first current transformer at its output terminal. The output terminal of the first transformer is connected to the input terminal of the first equipment group through a third switch. The output terminal of the first transformer is also connected to the input terminal of the second equipment group through a fourth switch. The signal terminal of the first current transformer is connected to the first relay protection device. The input terminal of the first transformer is equipped with the second current transformer. The input terminal of the first transformer is connected to the first external auxiliary power supply, and the signal terminal of the second current transformer is connected to the second relay protection device. When testing the circuit of the first transformer for a phase break using the second equipment group, the second switch and the third switch are in the open state, and the first switch and the fourth switch are in the closed state. When 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 the closed state, and the third switch and the fourth switch are in the open state; When the first external auxiliary power supply is used to supply power to the first equipment group and the second equipment group through the first transformer, the second switch and the third switch are in the closed state, and the first switch and the fourth switch are in the open state. The first current transformer is used to control the first relay protection device to issue an alarm signal when a phase loss is detected at the output terminal of the first transformer, and the second current transformer is used to control the second relay protection device to issue an alarm signal when a phase loss is detected at the input terminal of the first transformer.

2. The nuclear power plant system wiring system according to claim 1, characterized in that, It also includes a third equipment group, in which, The output terminal of the first generator of the nuclear power plant is connected to the input terminal of the first equipment group through the first switch, and the output terminal of the first generator of the nuclear power plant is also connected to the input terminal of the third equipment group through the fifth switch; The output terminal of the first transformer is also connected to the input terminal of the third equipment group via a sixth switch; When 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 the closed state, and the third switch and the fourth switch are in the open state; When the first external 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 the open state, and the second switch and the third switch are in the closed state. When the first generator of the nuclear power plant supplies power to the third equipment group, the fifth switch is in the closed state and the sixth switch is in the open state; When the first external auxiliary power supply supplies power to the third equipment group through the first transformer, the fifth switch is in the open state and the sixth switch is in the closed state.

3. The nuclear power plant system wiring system according to claim 2, characterized in that, It also includes a second transformer, a third current transformer, and a fourth current transformer, among which, The output terminal of the second transformer is equipped with the third current transformer. The output terminal of the second transformer is connected to the output terminal of the first transformer through the seventh switch. The signal terminal of the third current transformer is connected to the third relay protection device. The input terminal of the second transformer is equipped with the fourth current transformer. The input terminal of the second transformer is connected to the second external auxiliary power supply. The signal terminal of the fourth current transformer is connected to the fourth relay protection device. When testing the circuit of the second transformer to see if there is a phase loss, the fourth switch and the seventh switch are in the closed state, and the second switch and the third switch are in the open state. When the second external auxiliary power supply supplies power to the first equipment group and the second equipment group, the first switch and the fourth switch are in the open state, and the second switch, the third switch and the seventh switch are in the closed state; The third current transformer is used to control the third relay protection device to issue an alarm signal when a phase loss is detected at the output terminal of the second transformer, and the fourth current transformer is used to control the fourth relay protection device to issue an alarm signal when a phase loss is detected at the input terminal of the second transformer.

4. The nuclear power plant system wiring system according to claim 3, characterized in that, It also includes the second generator, the fourth equipment group, and the fifth equipment group of the nuclear power plant, among which, The output terminal of the second transformer is connected to the input terminal of the fourth equipment group via the eighth switch, and the output terminal of the second generator of the nuclear power plant is connected to the input terminal of the fourth equipment group via the ninth switch; The output terminal of the second transformer is connected to the input terminal of the fifth equipment group via the tenth switch, and the output terminal of the second generator of the nuclear power plant is connected to the input terminal of the fifth equipment group via the eleventh switch. When the first external auxiliary power supply supplies power to the fourth equipment group, the ninth switch is in the open state, and the seventh and eighth switches are in the closed state. When the second external auxiliary power supply supplies power to the fourth equipment group, the seventh switch and the ninth switch are in the open state, and the eighth switch is in the 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 the open state, and the ninth switch is in the closed state; When the second external auxiliary power supply supplies power to the fifth equipment group, the eleventh switch is in the open state and the tenth switch is in the closed state; When the second generator of the nuclear power plant supplies power to the fifth equipment group, the tenth switch is in the open state and the eleventh switch is in the closed state.

5. The nuclear power plant system wiring system according to claim 4, characterized in that, It also includes a sixth equipment group, the output of the fourth equipment group is connected to the input of the sixth equipment group through a twelfth switch, and the output of the second transformer is connected to the input of the sixth equipment group through a thirteenth switch; When testing the circuit of the second transformer for a phase break using the sixth equipment group, the seventh, eighth, and twelfth switches are in the open state, and the thirteenth switch is in the closed state. When testing the circuit of the first transformer for a phase break using the sixth equipment group, the eighth and twelfth switches are in the open state, and the seventh and thirteenth switches are in the closed state. When the first external auxiliary power source, the second external auxiliary power source, or the second generator of the nuclear power plant is supplying power to the sixth equipment group normally, the twelfth switch is in the closed state, and the thirteenth switch is in the open state.

6. The nuclear power plant system wiring system according to claim 5, characterized in that, It also includes the seventh and eighth equipment groups, among which, The first generator of the nuclear power plant is connected to the input terminal of the seventh equipment group via the fourteenth switch, and the output terminal of the second transformer is connected to the input terminal of the seventh equipment group via the fifteenth switch; The second generator of the nuclear power plant is connected to the input terminal of the eighth equipment group through the sixteenth switch, and the output terminal of the first transformer is connected to the input terminal of the eighth equipment group through the seventeenth switch; In the event of an anomaly in the third equipment group and the first generator of the nuclear power plant supplying power to the seventh equipment group, the fourteenth switch is in the closed state and the fifteenth switch is in the open state. In the event of an malfunction in the third equipment group and the second external auxiliary power supply supplying power to the seventh equipment group, the fourteenth switch is in the open state and the fifteenth switch is in the closed state. In the event of an anomaly in the fifth equipment group and the second generator of the nuclear power plant supplying power to the eighth equipment group, the sixteenth switch is in the closed state and the seventeenth switch is in the open state. When the fifth equipment group malfunctions and the first external auxiliary power supply is supplying power to the eighth equipment group, the sixteenth switch is in the open state and the seventeenth switch is in the closed state.

7. The nuclear power plant system wiring system according to claim 6, characterized in that, The first transformer has an eighteenth switch at its output terminal, and the second transformer has a nineteenth switch at its output terminal. The output terminal of the first transformer is connected to the input terminal of the first equipment group in sequence through the eighteenth switch and the third switch; the output terminal of the first transformer is connected to the input terminal of the second equipment group in sequence through the eighteenth switch and the fourth switch; the output terminal of the first transformer is connected to the input terminal of the third equipment group in sequence through the eighteenth switch and the sixth switch; the output terminal of the first transformer is connected to the input terminal of the eighth equipment group in sequence through the eighteenth switch and the seventeenth switch; and the output terminal of the first transformer is connected to the output terminal of the second transformer in sequence through the eighteenth switch, the seventh switch, and the nineteenth switch. The output terminal of the second transformer is connected to the input terminal of the seventh equipment group in sequence through the nineteenth switch and the fifteenth switch; the output terminal of the second transformer is connected to the input terminal of the fourth equipment group in sequence through the nineteenth switch and the eighth switch; the output terminal of the second transformer is connected to the input terminal of the fifth equipment group in sequence through the nineteenth switch and the tenth switch; and the output terminal of the second transformer is connected to the input terminal of the seventh equipment group in sequence through the nineteenth switch and the fifteenth switch. When the first external auxiliary power supply is required for testing or power supply, the eighteenth switch is in the closed state; When the second external auxiliary power supply is required for testing or power supply, the nineteenth switch is in the closed state.

8. The nuclear power plant system wiring system according to claim 6, characterized in that, It also includes the third, fourth, fifth, and sixth transformers, among which, The output terminal of the first generator of the nuclear power plant is connected to the input terminal of the third transformer, and the output terminal of the third transformer is connected to the input terminal of the first equipment group through the first switch; The output terminal of the first generator of the nuclear power plant is connected to the input terminal of the fourth transformer. The output terminal of the fourth transformer is connected to the input terminal of the third equipment group through the fifth switch. The output terminal of the fourth transformer is also connected to the input terminal of the seventh equipment group through the fourteenth switch. The output terminal of the second generator of the nuclear power plant is connected to the input terminal of the fifth transformer, and the output terminal of the fifth transformer is connected to the input terminal of the fourth equipment group through the ninth switch; The output terminal of the second generator of the nuclear power plant is connected to the input terminal of the sixth transformer, and the output terminal of the sixth transformer is connected to the input terminal of the fifth equipment group through the eleventh switch; the output terminal of the sixth transformer is also connected to the input terminal of the eighth equipment group through the sixteenth switch.

9. The nuclear power plant system wiring system according to claim 6, characterized in that, It also includes a first backup generator, a second backup generator, a third backup generator, and a fourth backup generator, among which, The output terminal of the first backup generator is connected to the input terminal of the third equipment group, the output terminal of the second backup generator is connected to the input terminal of the fifth equipment group, the output terminal of the third backup generator is connected to the input terminal of the seventh equipment group, and the output terminal of the fourth backup generator is connected to the input terminal of the eighth equipment group.

10. The nuclear power plant system wiring system according to claim 9, characterized in that, It also includes a fifth backup generator, which is connected to the input terminal of the third equipment group via a twentieth switch, the fifth backup generator is connected to the input terminal of the fifth equipment group via a twentieth switch, the fifth backup generator is connected to the input terminal of the seventh equipment group via a twentieth switch, and the fifth backup generator is connected to the input terminal of the eighth equipment group via a twentieth switch.

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