Oil pump control device and system based on nuclear power main transformer

Abstract

The utility model discloses an oil pump control device and system based on a nuclear power main transformer, and the oil pump control device comprises an oil pump relay, an oil pump relay coil, an expansion point intermediate relay, and a control module. The control module is used for controlling the expansion point intermediate relay to be switched on in real time when receiving a fault signal of the main transformer, so that the oil pump relay coil is electrified, the oil pump relay is switched off, and the oil pump stops running. According to the technical scheme, the requirement that the oil pump must be stopped rapidly when the nuclear power main transformer breaks down or emergencies occur can be met, through reasonable configuration of the oil pump relay, the oil pump relay coil, the point expansion intermediate relay and the control module, the oil pump power source can be cut off at the first time when the faults occur, potential fire or accident risks are avoided, and the safety of the nuclear power main transformer is improved. According to the technical scheme, the safety and the reliability are enhanced while the stability of the system is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to an oil pump control device and system based on a nuclear power main transformer. Background Art

[0002] The existing control circuit relies on the normally closed contacts of the GIS disconnect switches in the open position to control the start and stop of the cooler and oil pump. Because the operation of the GIS disconnect switches requires approval from the grid dispatching center, the entire process is time-consuming. This prevents the cooler oil pump from being immediately stopped in the event of a main transformer failure or fire. This delay allows oil in the transformer to continue to be injected into the fire source, increasing the risk of fire spread and combustion, and even causing the transformer to explode. Because the operation of the GIS disconnect switches is subject to the grid dispatching approval process, the system relies on a long operation time, increasing management complexity and response time, and failing to meet the requirements for rapid response to sudden fires and faults. According to the "Twenty-Five Key Requirements for Preventing Power Production Accidents," the "DL / T572-2021 Power Transformer Operation Regulations," and the "Eighteen Major Grid Accident Prevention Measures of State Grid Corporation of China," the cooler and oil pump must be immediately shut down in the event of a main transformer trip or fire. However, existing technical designs fail to meet these standards and suffer from compliance defects.

[0003] Therefore, the main defect of the existing technology is that the cooler oil pump cannot be shut down synchronously when the main transformer fails, which increases the risk of fire, complicates the operation process, and fails to meet current safety standards and fire protection requirements. Utility Model Content

[0004] The embodiments of the present utility model provide an oil pump control device and a frequency converter to solve the above technical problems.

[0005] A first aspect of an embodiment of the present invention provides an oil pump control device based on a nuclear power main transformer, comprising:

[0006] an oil pump relay connected to the oil pump relay, forming a first circuit with the oil pump and used to control the operating state of the oil pump through the switch state;

[0007] The oil pump relay coil is used to control the on / off state of the oil pump relay according to the power-on / off state;

[0008] An expansion point intermediate relay, which forms a second circuit with the oil pump relay coil and is used to control the power on and off state of the oil pump relay coil according to the switch state;

[0009] The control module is connected to the main transformer and the expansion point intermediate relay respectively, and is used to control the expansion point intermediate relay to be turned on in real time when receiving a fault signal from the main transformer, so that the oil pump relay coil is energized, so that the oil pump relay is disconnected, and then the oil pump stops running.

[0010] Optionally, the main transformer is respectively connected to a main transformer high-voltage side relay and a main transformer low-voltage side relay, the main transformer high-voltage side relay is used to control the switching state of the high-voltage side circuit of the main transformer, and the main transformer low-voltage side relay is used to control the switching state of the low-voltage side circuit of the main transformer;

[0011] The control module is also connected to the main transformer high-voltage side relay and the main transformer low-voltage side relay respectively. The control module is also used to control the main transformer high-voltage side relay and the main transformer low-voltage side relay to disconnect when receiving a fault signal of the main transformer.

[0012] Optionally, the main transformer high-voltage side relay includes a first main transformer high-voltage side relay and a second main transformer high-voltage side relay, the high-voltage side circuit includes a first high-voltage side circuit and a second high-voltage side circuit, the first main transformer high-voltage side relay is used to control the switching state of the first high-voltage side circuit, and the second main transformer high-voltage side relay is used to control the switching state of the second high-voltage side circuit;

[0013] The control module is further configured to control the first main transformer high-voltage side relay and the second main transformer high-voltage side relay to be disconnected when receiving a fault signal of the main transformer.

[0014] Optionally, the control module is a GPA protection device.

[0015] Optionally, the control module is also connected to the high-voltage side circuit of the main transformer, and the main transformer, the control module and the high-voltage side circuit form a high-voltage power supply circuit. The control module is also used to disconnect the high-voltage power supply circuit when receiving a fault signal from the main transformer.

[0016] Optionally, the control module is a GIS circuit breaker at the high-voltage side outlet of the main transformer.

[0017] Optionally, the main transformer is respectively connected to a main transformer high-voltage side relay and a main transformer low-voltage side relay, the main transformer high-voltage side relay is used to control the switching state of the high-voltage side circuit of the main transformer, and the main transformer low-voltage side relay is used to control the switching state of the low-voltage side circuit of the main transformer;

[0018] The control module is also connected to the main transformer high-voltage side relay and the main transformer low-voltage side relay respectively, and the control module is also used to determine that a fault signal of the main transformer is received when a disconnection signal of the main transformer high-voltage side relay and the main transformer low-voltage side relay is received.

[0019] Optionally, the control module is a DCS system.

[0020] A second aspect of an embodiment of the present invention provides an oil pump control system based on a nuclear power main transformer, comprising: the oil pump control device and the oil pump described in the first aspect, wherein the oil pump is connected to the oil pump relay.

[0021] Optionally, the oil pump control system further includes a main transformer, a main transformer high-voltage side relay, and a main transformer low-voltage side relay, and the main transformer is connected to the main transformer high-voltage side relay and the main transformer low-voltage side relay respectively.

[0022] The technical effect of the embodiment of the utility model is: this technical solution can meet the requirement that the oil pump must stop quickly when a fault or emergency occurs in the nuclear power main transformer. Through the reasonable configuration of the oil pump relay, oil pump relay coil, expansion point intermediate relay and control module, the system can cut off the power supply of the oil pump as soon as a fault occurs, avoiding potential fire or accident risks. This technical solution enhances safety and reliability while maintaining system stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Figure 1 This is a structural diagram of an oil pump control device provided in Example 1 of the present utility model;

[0025] Figure 2 This is a first structural diagram of a control module in a first embodiment of an oil pump control device provided in Example 1 of the present utility model;

[0026] Figure 3 This is a second structural diagram of a control module in a first embodiment of an oil pump control device provided in Example 1 of the present utility model;

[0027] Figure 4 This is a third structural diagram of a control module in a first embodiment of an oil pump control device provided in Example 1 of the present utility model;

[0028] Figure 5 This is a circuit diagram of a first embodiment of a control module in an oil pump control device provided in Example 1 of the present utility model;

[0029] Figure 6 This is a first structural diagram of a second implementation mode of a control module in an oil pump control device provided in Example 1 of the present utility model;

[0030] Figure 7 This is a second structural diagram of a control module in a second embodiment of an oil pump control device provided in Example 1 of the present utility model;

[0031] Figure 8 This is a third structural diagram of a second embodiment of a control module in an oil pump control device provided in Example 1 of the present utility model;

[0032] Figure 9 This is a first structural diagram of a third implementation mode of a control module in an oil pump control device provided in Example 1 of the present utility model;

[0033] Figure 10 This is a second structural diagram of a control module in a third embodiment of an oil pump control device provided in Example 1 of the present utility model;

[0034] In the figure: 10, oil pump; 101, oil pump relay; 102, oil pump relay coil; 103, expansion point intermediate relay; 104, control module; 105, main transformer; 141, GPA protection device; 142, GIS circuit breaker at the high-voltage side outlet of the main transformer; 143, DCS system; 151, main transformer high-voltage side relay; 152, main transformer low-voltage side relay; 160, high-voltage side circuit. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] It should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present invention to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for clarity. Like reference numerals denote like elements throughout.

[0037] In order to fully understand the present invention, the following description will provide detailed structures and steps to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention may also have other implementation methods.

[0038] Example 1

[0039] This embodiment provides an oil pump control device based on a nuclear power main transformer, such as Figure 1 Shown, including:

[0040] The oil pump relay 101 forms a first circuit with the oil pump 10 and is used to control the operating state of the oil pump 10 through the switch state;

[0041] The oil pump relay coil 102 is used to control the on / off state of the oil pump relay 101 according to the power-on / off state;

[0042] The expansion point intermediate relay 103 forms a second circuit with the oil pump relay coil 102 and is used to control the power on and off state of the oil pump relay coil 102 according to the switch state;

[0043] The control module 104 is connected to the main transformer 105 and the expansion point intermediate relay 103 respectively, and is used to control the expansion point intermediate relay 103 in real time to conduct when receiving a fault signal from the main transformer 105, so that the oil pump relay coil 102 is energized, so that the oil pump relay 101 is disconnected, and then the oil pump 10 stops running.

[0044] The oil pump control device is designed to ensure that the oil pump 10 can quickly stop operating when a fault occurs in the main transformer 105, preventing the occurrence of fire or other safety hazards. The control module 104 determines that a fault has occurred upon receiving a fault signal from the main transformer 105. Fault signals include, but are not limited to, the following: 1. Overtemperature fault signal: When the temperature of the main transformer 105 is too high, for example, a fire occurs, the temperature detection module of the main transformer 105 will transmit a signal to the control module 104. The control module 104 will activate the expansion point intermediate relay 103, thereby de-energizing the oil pump relay 101 and stopping the oil pump. 2. Overcurrent fault signal: When an overcurrent condition occurs in the main transformer 105, the current protection module of the main transformer 105 detects the abnormality and transmits a signal to the control module 104. After the control module 104 determines that an overcurrent fault has occurred, it triggers the expansion point intermediate relay 103 to control the oil pump relay 101 to disconnect. 3. Short-circuit Fault Signal: When a short circuit occurs in the internal or external wiring of the main transformer 105, the short-circuit protection module of the main transformer 105 quickly transmits a fault signal to the control module 104. The control module 104 immediately responds by triggering the oil pump relay 101 to disconnect via the expansion intermediate relay 103, thereby cutting off the power supply to the oil pump and stopping operation, preventing the short-circuit current from causing damage to the system. 4. Undervoltage Fault Signal: When the input voltage of the main transformer 105 falls below the normal operating range, the undervoltage detection module of the main transformer 105 generates a fault signal and transmits it to the control module 104. After receiving the undervoltage signal, the control module 104 controls the oil pump relay 101 to disconnect power via the expansion intermediate relay 103, ensuring that the oil pump stops operating under low voltage conditions and preventing abnormal operation or damage to the oil pump due to insufficient voltage. 5. Abnormal Winding Temperature Signal: When the winding temperature of the main transformer 105 reaches a dangerous level, the winding temperature protection module of the main transformer 105 transmits a fault signal to the control module 104. After receiving this signal, the control module 104 will start the expansion point intermediate relay 103 to disconnect the oil pump relay, so as to protect the main transformer 105 in a high temperature environment and stop the oil pump operation.

[0045] The oil pump relay 101 is a switching device used to control the operation of the oil pump 10. When the oil pump relay 101 is closed, the oil pump 10 operates; when the oil pump relay 101 is disconnected, the oil pump 10 stops. The oil pump relay 101 switches its on / off state via a switching signal in the control circuit, thereby controlling the start or stop of the oil pump 10. The oil pump relay coil 102 is used to control the on / off state of the oil pump relay 101 by gaining or losing power. When the oil pump relay coil 102 loses power, the oil pump relay 101 closes and the oil pump 10 begins operating; when the oil pump relay coil 102 is energized, the oil pump relay 101 disconnects and the oil pump 10 stops operating. Upon receiving a control signal, the oil pump relay coil 102 adjusts the closing or opening of the oil pump relay 101, thereby directly affecting the operating state of the oil pump 10. The expansion point intermediate relay 103 and the oil pump relay coil 102 form a second circuit for controlling the on / off state of the oil pump relay coil 102. Its function is to extend the control signal to the oil pump relay coil 102, thereby affecting the operating state of the oil pump 10. When the main transformer 105 fails, the control module 104 will turn on the expansion point intermediate relay 103, thereby powering the oil pump relay coil 102, thereby disconnecting the oil pump relay 101 and stopping the operation of the oil pump 10. The control module 104 is the core of the entire system, used to monitor the status of the main transformer 105 in real time. When the main transformer 105 fails, the control module 104 will send a signal to the expansion point intermediate relay 103 to ensure that the oil pump relay coil 102 is energized, thereby stopping the operation of the oil pump 10. The control module 104 continuously monitors the operating state of the main transformer 105. Once a fault is detected, it immediately sends a conduction signal to the expansion point intermediate relay 103 to ensure that the oil pump 10 stops operating, thereby effectively reducing the risk of the fault expanding. The module provides highly reliable monitoring and control capabilities during system operation, and can take appropriate measures the moment a fault occurs in the main transformer 105, minimizing the possibility of fire and equipment damage.

[0046] The technical effect of this embodiment is that: this technical solution can meet the requirement that the oil pump must stop quickly when a fault or emergency occurs in the nuclear power main transformer 105. Through the reasonable configuration of the oil pump relay 101, the oil pump relay coil 102, the expansion point intermediate relay 103 and the control module 104, the system can cut off the power supply of the oil pump as soon as a fault occurs, avoiding potential fire or accident risks. This technical solution enhances safety and reliability while maintaining system stability.

[0047] As a first implementation of the control module 104, Figure 2As shown, the main transformer 105 is respectively connected to the main transformer high-voltage side relay 151 and the main transformer low-voltage side relay 152, the main transformer high-voltage side relay 151 is used to control the switching state of the high-voltage side circuit of the main transformer 105, and the main transformer low-voltage side relay 152 is used to control the switching state of the low-voltage side circuit of the main transformer 105; the control module 104 is also respectively connected to the main transformer high-voltage side relay 151 and the main transformer low-voltage side relay 152, and the control module 104 is also used to control the main transformer high-voltage side relay 151 and the main transformer low-voltage side relay 152 to disconnect when receiving a fault signal of the main transformer 105.

[0048] The main transformer high-voltage-side relay 151 controls the switching state of the high-voltage-side circuit of the main transformer 105. Upon receiving a disconnect command from the control module 104, it disconnects the high-voltage-side power supply to the high-voltage-side circuit. The main transformer low-voltage-side relay 152 controls the switching state of the low-voltage-side circuit of the main transformer 105. Upon receiving a disconnect command from the control module 104, it disconnects the low-voltage-side power supply. The control module 104 monitors the status of the main transformer 105. Upon detecting a fault signal indicating the operation of the main transformer 105, the main transformer high-voltage-side relay 151 and the low-voltage-side relay 152 are disconnected to isolate the fault. Simultaneously, the expansion-point intermediate relay 103 is turned on to stop the oil pump.

[0049] The technical effect of this embodiment is that when a main transformer fails, the high-voltage and low-voltage side circuits can be quickly isolated, and the oil pump can be stopped at the same time, thereby achieving effective isolation and protection against the fault, minimizing the risk of fire or equipment damage, and thus improving the overall safety and reliability of the power system.

[0050] As an implementation method, Figure 3 As shown, the control module 104 is a GPA protection device 141, which is connected to the main transformer 105 and the expansion point intermediate relay 103 respectively. The GPA protection device 141 is used to control the expansion point intermediate relay 103 to be turned on in real time when a fault occurs in the main transformer 105.

[0051] Among them, the full name of the GPA protection device 141 is the Generator-Transformer Unit Protection System. The GPA protection device 141 is an important system in a nuclear power plant for protecting the safe operation of primary equipment such as generators, main transformers, step-down transformers, excitation transformers and 24kV busbars. It is used to monitor the operating status of the main transformer 105 in real time and respond immediately when a fault (such as overcurrent, short circuit, internal fault, fire, etc.) is detected. The GPA protection device 141 continuously detects the electrical parameters of the main transformer 105. When a fault or abnormal condition is detected, it will immediately output a control signal to control the expansion point intermediate relay 103 to conduct, thereby cutting off the power supply to the oil pump relay coil 102, and ultimately causing the oil pump 10 to stop running. The expansion point intermediate relay 103 is used to receive the signal of the GPA protection device 141 and control the on and off of the oil pump relay coil 102 according to the signal status. When the expansion point intermediate relay 103 receives a fault signal from the GPA protection device 141, it quickly connects the power supply circuit to the oil pump relay coil 102, causing the oil pump relay 101 to disconnect, thereby stopping the operation of the oil pump 10. The oil pump relay 101 is responsible for controlling the start and stop of the oil pump 10. It receives signals from the oil pump relay coil 102 and controls the operating status of the oil pump 10 by closing or opening the circuit. When the oil pump relay coil 102 loses power, the oil pump relay 101 closes, and the oil pump 10 begins to operate; when the oil pump relay coil 102 is energized, the oil pump relay 101 disconnects, and the oil pump 10 stops. When the GPA protection device 141 detects a fault in the main transformer 105, it connects the power supply to the oil pump relay coil 102 through the expansion point intermediate relay 103, energizing the oil pump relay coil 102, and then disconnecting the oil pump relay 101, stopping the operation of the oil pump 10.

[0052] The technical effect of this embodiment is that the GPA protection device 141 monitors the operating status of the main transformer 105 in real time. When a fault is detected, the GPA protection device 141 controls the expansion-point intermediate relay 103 to cut off power to the oil pump relay coil 102, ultimately stopping the oil pump. The coordinated operation of these modules ensures normal system operation while enabling rapid response to faults, minimizing the risk of fire or equipment damage and complying with the power industry's fire protection requirements for main transformers.

[0053] Further, such as Figure 4As shown, the GPA protection device 141 is respectively connected to the main transformer high-voltage side relay 151 and the main transformer low-voltage side relay 152; the GPA protection device 141 is used to control the main transformer high-voltage side relay 151 and the main transformer low-voltage side relay 152 to be disconnected when a fault occurs in the main transformer 105, and at the same time, control the expansion point intermediate relay 103 to be turned on.

[0054] The main transformer high-voltage side relay 151 controls the circuit switching state on the high-voltage side of the main transformer. When the GPA protection device 141 detects a fault or fire, it immediately controls the relay on the high-voltage side to disconnect, thereby cutting off the power supply to the high-voltage side of the main transformer and preventing further electrical faults or fires. Upon receiving a control signal from the GPA protection device 141, the main transformer high-voltage side relay 151 rapidly disconnects the high-voltage side power circuit when a fault occurs, ensuring that the high-voltage side of the main transformer no longer receives power. The main transformer low-voltage side relay 152 controls the circuit switching state on the low-voltage side of the main transformer. When the GPA protection device 141 detects a fault or fire in the main transformer 105, it simultaneously controls the relay on the low-voltage side to disconnect, cutting off the power supply to the low-voltage side. When the GPA protection device 141 issues a fault signal, the low-voltage side relay rapidly disconnects the low-voltage side circuit, preventing current from continuing to flow to the low-voltage side and preventing the fault from spreading to the low-voltage grid or affecting other equipment. The GPA protection device 141, as the control module 104 in this embodiment, monitors the operating status of the main transformer 105. When a fault is detected in main transformer 105, GPA protection device 141 disconnects main transformer high-voltage relay 151 and main transformer low-voltage relay 152. Simultaneously, it switches on expansion relay 103, ensuring rapid isolation of the faulty circuit and stopping oil pump 10 to prevent the spread of a fire or other incident. GPA protection device 141 continuously monitors the electrical parameters of main transformer 105. When a fault occurs, it immediately sends control signals to main transformer high-voltage relay 151, main transformer low-voltage relay 152, and expansion relay 103, instructing them to disconnect their corresponding circuits, completing the entire process of fault isolation and oil pump shutdown.

[0055] The technical effect of this embodiment is that the entire system, using GPA protection device 141 as the core control unit, rapidly disconnects the power supply to both the high-voltage and low-voltage sides of the main transformer, while simultaneously controlling the expansion relay to stop the oil pump. This multi-relay collaborative operation ensures that, in the event of a main transformer 105 failure, not only can the faulty circuit be quickly isolated, but the oil pump can also be stopped promptly, minimizing the risk of fire or equipment damage, thereby enhancing the safety and reliability of the system.

[0056] As an embodiment, the main transformer high-voltage side relay 142 includes a first main transformer high-voltage side relay and a second main transformer high-voltage side relay, the high-voltage side circuit 160 includes a first high-voltage side circuit and a second high-voltage side circuit, the first main transformer high-voltage side relay is used to control the switching state of the first high-voltage side circuit, and the second main transformer high-voltage side relay is used to control the switching state of the second high-voltage side circuit; the control module is also used to control the first main transformer high-voltage side relay and the second main transformer high-voltage side relay to disconnect when receiving a fault signal of the main transformer 105.

[0057] Among them, when the main transformer 105 fails, the control module controls the first main transformer high-voltage side relay and the second main transformer high-voltage side relay to quickly cut off the high-voltage power output of the main transformer, and at the same time cuts off the oil pump power supply through the expansion point intermediate relay, ensuring that the system can respond quickly in the event of a fault and prevent further expansion of fire or equipment damage.

[0058] It should be noted that, in addition to the GPA protection device 141, the control module 104 includes, but is not limited to, the following modules: 1. Differential protection module: This module monitors current changes in transformer short circuits and quickly disconnects the main transformer circuit when a current imbalance is detected. 2. Overcurrent protection module: This module monitors current to prevent it from exceeding the current threshold. Once an overload or short circuit occurs, it immediately disconnects the circuit to protect the equipment. 3. Overvoltage protection module: This module detects voltage fluctuations and immediately disconnects the circuit when the system voltage exceeds a safe range. 4. Thermal protection module: This module monitors the temperature of the transformer or other equipment and issues an alarm or disconnects the power supply when the temperature is too high to prevent damage caused by overheating.

[0059] As an example, Figure 5As shown, one end of the main transformer U0 is connected to one end of the grounding switch K21, one end of the plant transformer A, one end of the plant transformer B, and one end of the switch K22. The other end of the grounding switch K21 is grounded. The other end of the switch K22 is connected to one end of the spacer K23. The other end of the spacer K23 is respectively connected to one end of the grounding switch K24 and the AC power U1. The other end of the grounding switch K24 is grounded. The other end of the main transformer U0 is respectively connected to one end of the grounding switch K20, the busbar L, one end of the spacer K25, and one end of the grounding switch K19. The other end of the grounding switch K19 is grounded. The other end of the spacer K25 is respectively connected to one end of the spacer K4, one end of the grounding switch K5, and one end of the spacer K6. The other end of the grounding switch K5 is grounded. The other end of the spacer K4 is respectively connected to one end of the switch K2 and one end of the grounding switch K3. The other end of the grounding switch K3 is grounded. The other end of the switch K2 is respectively connected to one end of the grounding switch K30 and one end of the spacer K1. The other end is connected to the load, the other end of the grounding switch K30 is grounded, the other end of the spacer K6 is respectively connected to one end of the grounding switch K7 and one end of the switch K8, the other end of the grounding switch K7 is grounded, the other end of the switch K8 is respectively connected to one end of the grounding switch K9 and one end of the spacer K10, the other end of the grounding switch K9 is grounded, the other end of the spacer K10 is respectively connected to one end of the grounding switch K11, one end of the spacer K12 and one end of the spacer K18, the other end of the spacer K12 is respectively connected to one end of the grounding switch K13 and one end of the spacer K14, the other end of the grounding switch K13 is grounded, the other end of the spacer K14 is respectively connected to one end of the grounding switch K15 and one end of the spacer K16, the other end of the grounding switch K15 is grounded, the other end of the spacer K16 is connected to the busbar L, the other end of the spacer K18 is respectively connected to one end of the grounding switch K26 and one end of the spacer K17, the other end of the grounding switch K26 is grounded, and the other end of the spacer K17 is connected to the load.

[0060] Among them, the isolation switches K1, K4, K6, K10, K12, K14, K16, K17, K18, K22, K23, and K25 are all normally closed. The grounding switches K3, K5, K7, K9, K11, K13, K15, K19, K20, K21, K24, K26, and K30 are all normally open. Switches K2 and K8 serve as the main transformer high-voltage side relay 151, while switch K22 serves as the main transformer low-voltage side relay 152. The tripping command for the output of the GPA protection device 141 is directly connected to the automatic start / stop circuit of the cooler. In the event of a sudden fire or failure in the main transformer, the GPA protection device 141 directly trips the two groups of circuit breakers K2 and K8 (3 / 2 connection) on the high-voltage side of the main transformer GIS, and disconnects the relay K22 on the low-voltage side of the main transformer. At the same time, the GPA protection device 141 sends a trip command to connect the automatic switching circuit of the main transformer cooler. After the expansion point intermediate relay 103 is energized, the cooler control circuit loses power, and the cooler and submersible oil pump stop running.

[0061] The circuit structure does not require any additional devices and is simple to operate. It can disconnect the oil pump in the event of a fault or fire without the need for additional tools and equipment.

[0062] As a second implementation of the control module 104, Figure 6 As shown, the control module 104 is also connected to the high-voltage side circuit 160 of the main transformer 105. The main transformer 105, the control module 104 and the high-voltage side circuit 160 form a high-voltage power supply circuit. The control module 104 is also used to disconnect the high-voltage power supply circuit when receiving a fault signal from the main transformer 105.

[0063] The main transformer 105 is used for power transmission and voltage conversion and is connected to the high-voltage side circuit 160 via the control module 104. Under normal operating conditions, the main transformer 105 supplies power to the high-voltage side circuit 160 via the control module 104. If a fault occurs in the main transformer 105, the control module 104 is disconnected, cutting off the power output from the high-voltage side of the main transformer.

[0064] The technical effect of this embodiment is that it realizes an efficient fault detection and response mechanism. When the main transformer 105 fails, the control module 104 cuts off the high-voltage side power transmission and stops the power supply to the cooling system through the expansion point intermediate relay 103, thereby improving the safety and stability of the system under fault conditions and avoiding the spread of the fault and further damage to the equipment.

[0065] As an implementation method, Figure 7As shown, the control module 104 is the main transformer high-voltage side outlet GIS circuit breaker 142, which is connected to the main transformer 105, the expansion point intermediate relay 103 and the high-voltage side circuit 160; the main transformer high-voltage side outlet GIS circuit breaker 142 is used to disconnect when a fault occurs in the main transformer 105, and at the same time control the expansion point intermediate relay 103 to be turned on.

[0066] The GIS circuit breaker is part of a gas-insulated switchgear (GIS). A key component of GIS equipment, the GIS circuit breaker serves as a control and protection device for the power system in power transmission and transformation lines. The GIS circuit breaker 142 at the high-voltage side of the main transformer connects to the main transformer 105 and automatically disconnects the high-voltage side circuit in the event of a fault in the main transformer 105. This not only cuts off power transmission to the high-voltage side of the main transformer 105 but also controls the expansion relay 103 to disconnect the cooler and oil pump circuits, preventing the oil pump 10 from continuing to operate. Under normal operating conditions, the GIS circuit breaker 142 at the high-voltage side of the main transformer remains closed, allowing the high-voltage side of the main transformer and the oil pump 105 to operate normally. If a fault occurs in the main transformer 105, the GIS circuit breaker 142 at the high-voltage side of the main transformer immediately opens, shutting off power to the high-voltage side and simultaneously sending a control signal to the expansion relay 103 to disconnect the power supply circuits to the cooler and oil pump, thereby stopping the oil pump 10. The rapid response of the GIS circuit breaker 142 at the high-voltage side of the main transformer (opening in just tens of milliseconds) ensures that the high-voltage side circuits and cooler oil pumps of the main transformer are quickly disconnected in the event of a fault, significantly improving equipment safety and preventing the spread of faults or fire hazards. The main transformer 105, as the core electrical equipment of the system, is responsible for power transmission and conversion. Its high-voltage side is connected to the GIS circuit breaker 142 at the high-voltage side of the main transformer for circuit protection and control. Under normal operation, the main transformer 105 is connected to the high-voltage side through the GIS circuit breaker 142 at the high-voltage side of the main transformer, providing power transmission. In the event of a fault, the GIS circuit breaker 142 at the high-voltage side of the main transformer automatically disconnects the circuit, protecting the main transformer 105 and the high-voltage side. The combination of the main transformer 105 and the GIS circuit breaker 142 at the high-voltage side of the main transformer provides effective fault protection, preventing damage to equipment due to excessive current or short circuits in the event of a sudden fault, while also ensuring overall system stability. The expansion relay 103 receives the opening signal from the GIS circuit breaker 142 at the high-voltage side of the main transformer. The expansion relay 103 is connected to the GIS circuit breaker 142 at the high-voltage outlet of the main transformer. When the GIS circuit breaker 142 detects a main transformer fault and trips, it simultaneously switches on the power to the oil pump relay coil 102, ensuring the timely shutdown of the oil pump 10 and cooler, preventing fire or further equipment damage caused by continued operation. The expansion relay 103 ensures that the control signal from the GIS circuit breaker 142 at the high-voltage outlet of the main transformer is smoothly transmitted to the oil pump control system, enabling a rapid response and safe equipment shutdown.

[0067] The technical advantage of this embodiment is that, by providing a GIS circuit breaker 142 at the high-voltage outlet of the main transformer, when a fault occurs in the main transformer 105, the GIS circuit breaker 142 at the high-voltage outlet of the main transformer 105 can be quickly tripped. This GIS circuit breaker 142 also controls the expansion relay 103 to promptly cut off power to the oil pump relay coil 102, ensuring that the cooler and oil pump immediately cease operation in the event of a fault. This system, without requiring additional equipment, relies on existing relay and circuit design to rapidly shut down the oil pump in the event of a fault. It is simple to operate, safe, and reliable, effectively preventing the spread of faults and the occurrence of fires.

[0068] Further, such as Figure 8 As shown, the main transformer high-voltage side outlet GIS circuit breaker 142 is connected between the main transformer 105 and the main transformer high-voltage side relay 151 , and the main transformer 105 is also connected to the main transformer low-voltage side relay 152 .

[0069] The main transformer high-voltage side outlet GIS circuit breaker 142 is located between the main transformer 105 and the main transformer high-voltage side relay 151 and is used to connect and protect the main transformer 105. In the event of a main transformer fault, the main transformer high-voltage side outlet GIS circuit breaker 142 quickly opens, cutting off the power supply to the high-voltage side and preventing the fault from spreading to other equipment. Under normal circumstances, the main transformer high-voltage side outlet GIS circuit breaker 142 is closed, and the main transformer 105 is properly connected to the high-voltage side grid. In the event of a main transformer 105 fault, the main transformer high-voltage side outlet GIS circuit breaker 142 automatically opens, cutting off the high-voltage side output of the main transformer 105.

[0070] The technical effect of this embodiment is that through the coordinated operation of the main transformer high-voltage side outlet GIS circuit breaker 142, the main transformer high-voltage side relay 151, the main transformer low-voltage side relay 152, and the expansion intermediate relay 103, comprehensive protection is achieved for the main transformer 105 and its associated equipment. In the event of a main transformer 105 fault, the main transformer high-voltage side outlet GIS circuit breaker 142, the main transformer high-voltage side relay 151, and the main transformer low-voltage side relay 152 will quickly cut off the power output of the main transformer 105. Simultaneously, the expansion intermediate relay 102 cuts off the power supply to the oil pump, ensuring a rapid system response in the event of a fault and preventing further escalation of fire or equipment damage. This design achieves system efficiency, safety, and reliability.

[0071] As an example, Figure 5As shown, switches K1, K4, K6, K10, K12, K14, K16, K17, K18, K22, and K23 are all normally closed. Grounding switches K3, K5, K7, K9, K11, K13, K15, K19, K20, K21, K24, K26, and K30 are all normally open. Switch K2 is the high-voltage side relay for the first main transformer, switch K8 is the high-voltage side relay for the second main transformer, and switch K22 is the low-voltage side relay 152 for the main transformer. Switch K25 is the main transformer high-voltage side outlet GIS circuit breaker 142, connected to the cooler start-stop circuit, immediately shutting down the oil pump 10 via the expansion relay 103. Because the opening and closing of the GIS circuit breaker 142 at the high-voltage side outlet of the main transformer is instantaneous, with a speed of tens of milliseconds, and there is no need to apply to the grid dispatcher, the circuit breaker will be directly opened in the event of a sudden fault, thereby immediately shutting down the oil pump.

[0072] As a third implementation of the control module 104, Figure 2 As shown, the main transformer 105 is respectively connected to the main transformer high-voltage side relay 151 and the main transformer low-voltage side relay 152, the main transformer high-voltage side relay 151 is used to control the switching state of the high-voltage side circuit of the main transformer 105, and the main transformer low-voltage side relay 152 is used to control the switching state of the low-voltage side circuit of the main transformer 105; the control module 104 is also respectively connected to the main transformer high-voltage side relay 151 and the main transformer low-voltage side relay 152, and the control module 104 is also used to determine that a fault signal of the main transformer 105 is received when a disconnection signal of the main transformer high-voltage side relay 151 and the main transformer low-voltage side relay 152 is received.

[0073] The control module 104 is configured to receive signals from the high-voltage side relay 151 and the low-voltage side relay 152 and, based on these signals, determine whether the main transformer has failed. Upon receiving disconnect signals from the high-voltage side relay 151 and the low-voltage side relay 152, the control module 104 confirms a main transformer failure and controls the expansion point intermediate relay 103 to conduct, energizing the oil pump relay coil 102. This disconnects the oil pump relay 101, thereby stopping the oil pump 10.

[0074] As an implementation method, Figure 9 As shown, the control module 104 is a DCS system 143. The DCS system 143 detects the connection between the main transformer 105 and the expansion point intermediate relay 103. The DCS system 143 is used to control the expansion point intermediate relay 103 to disconnect in real time when the main transformer 105 fails.

[0075] The DCS (Distributed Control System) is a distributed control system used to monitor and control various modules of the entire power system in real time. The DCS system 143 is connected to the expansion relay 103 and monitors the operating status of the main transformer 105. When a fault in the main transformer 105 is detected, the DCS system 143 sends a signal to the expansion relay 103 to disconnect the power supply to the oil pump 10. The DCS system 143 monitors the electrical parameters (such as current, voltage, and temperature) of the main transformer 105 in real time through sensors and control loops. When the DCS system 143 detects a fault or abnormality in the main transformer 105, it immediately sends a control signal to turn on the expansion relay 103, thereby stopping the operation of the oil pump 10 and preventing continued oil supply from causing a fire or further equipment damage. When the DCS system 143 issues a fault control signal, the expansion relay 103 immediately turns on the power to the oil pump relay coil 102, causing the oil pump relay 101 to disconnect, thereby stopping the oil pump.

[0076] The technical effect of this embodiment is that, through real-time monitoring of main transformer 105 by DCS system 143, when a main transformer 105 fails, DCS system 143 can promptly control expansion relay 103 to ensure that oil pump relay 101 is disconnected, causing the oil pump and cooler to stop operating. This technical solution utilizes the intelligent control characteristics of the DCS to achieve a rapid response to main transformer failures, avoid the risk of fire or equipment damage caused by continued operation of the oil pump, and ensure the safety and reliability of the power system.

[0077] Further, such as Figure 10 As shown, the main transformer 105 is connected to the main transformer high-voltage side relay 151 and the main transformer low-voltage side relay 152, respectively, and the DCS system 143 is connected to the main transformer high-voltage side relay 151 and the main transformer low-voltage side relay 152, respectively. When the DCS system 143 detects that the main transformer high-voltage side relay 151 and the main transformer low-voltage side relay 152 are both disconnected, it is determined that the main transformer 105 has a fault.

[0078] The main transformer high-voltage side relay 151 is located at the high-voltage output end of the main transformer 105 and protects the high-voltage side circuit of the main transformer 105. In the event of abnormal current flow or other faults, the main transformer high-voltage side relay 151 disconnects the circuit, cutting off the high-voltage power output. Under normal operating conditions, the main transformer high-voltage side relay 151 remains closed, and the main transformer 105 transmits power to the grid via the high-voltage side. The main transformer low-voltage side relay 152 is located at the low-voltage output end of the main transformer and is responsible for monitoring and protecting the low-voltage side circuit. Under normal conditions, the main transformer low-voltage side relay 152 remains closed. In the event of a low-voltage side fault or abnormal current flow, the main transformer low-voltage side relay 152 disconnects the low-voltage circuit, cutting off the low-voltage power output. The DCS system 143 monitors the status of the main transformer high-voltage side relay 151 and the main transformer low-voltage side relay 152 in real time. By detecting the status of these two relays, it can determine whether the main transformer 105 has experienced a fault. The DCS system 143 collects real-time operating status data of the main transformer high-voltage side relay 151 and the main transformer low-voltage side relay 152. When DCS system 143 detects that both relays are disconnected, it determines that a serious fault has occurred in main transformer 105 and initiates appropriate protection and shutdown measures. In addition, DCS system 143 also triggers other safety mechanisms, such as shutting down the cooler and oil pump, to prevent further expansion of the fault.

[0079] The technical effect of this embodiment is that, through real-time monitoring by the DCS system 143, faults in the main transformer 105 are determined based on the status of the main transformer high-voltage side relay 151 and the main transformer low-voltage side relay 152. When the DCS system 143 detects that both relays are disconnected, it immediately determines that a fault has occurred in the main transformer 105 and triggers the expansion point intermediate relay 103 to conduct, ensuring that the oil pump stops operating. This not only improves system safety but also ensures the equipment's rapid response and handling capabilities in the event of a fault, preventing other accidents caused by a main transformer failure.

[0080] As an example, Figure 5As shown, switches K1, K4, K6, K10, K12, K14, K16, K17, K18, K22, K23, and K25 are all in the normally closed state. Grounding switches K3, K5, K7, K9, K11, K13, K15, K19, K20, K21, K24, K26, and K30 are all in the normally open state. Switches K2 and K8 serve as relays 151 on the high-voltage side of the main transformer, while switch K22 serves as relay 152 on the low-voltage side of the main transformer. The logic configuration of the command sent by DCS system 143 is as follows: the open position signals of switch K2, switch K8 and switch K22 are fed back to DCS system 143, DCS system 143 determines that the main transformer 105 has a fault and trips, and DCS system 143 automatically sends a long pulse command remotely to connect the automatic switching circuit of the main transformer cooler. After the expansion point intermediate relay 103 is energized, the cooler control circuit loses power, and the cooler and submersible oil pump stop operating.

[0081] The utility model has the following advantages:

[0082] 1. Through optimized design, the cooler oil pump is effectively shut down at the same time after a sudden fire or fault trip in the main transformer, minimizing risks and increasing equipment safety.

[0083] 2. Under the premise of not violating relevant regulations and ensuring that all original functions remain unchanged, the optimized design is carried out, and the implementation is simple without adding other devices and equipment.

[0084] Example 2

[0085] The second embodiment provides an oil pump control system based on a nuclear power main transformer, including: the oil pump control device and oil pump provided in the first embodiment, wherein the oil pump is connected to an oil pump relay.

[0086] Furthermore, the oil pump control system also includes a main transformer, a main transformer high-voltage side relay and a main transformer low-voltage side relay. The control module is connected to the main transformer, and the main transformer is connected to the main transformer high-voltage side relay and the main transformer low-voltage side relay respectively.

[0087] The functions, working processes and technical effects of each module in this embodiment 2 can be found in embodiment 1 and will not be described in detail here.

[0088] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. An oil pump control device based on a nuclear power main transformer, characterized in that: include: An oil pump relay, which forms a first circuit with the oil pump and is used to control the operating state of the oil pump through the switch state; An oil pump relay coil is connected to the oil pump relay and is used to control the on / off state of the oil pump relay according to the power-on / off state; An expansion point intermediate relay, which forms a second circuit with the oil pump relay coil and is used to control the power on and off state of the oil pump relay coil according to the switch state; The control module is connected to the main transformer and the expansion point intermediate relay respectively, and is used to control the expansion point intermediate relay to be turned on in real time when receiving a fault signal from the main transformer, so that the oil pump relay coil is energized, so that the oil pump relay is disconnected, and then the oil pump stops running.

2. The oil pump control device according to claim 1, wherein: The main transformer is connected to a main transformer high-voltage side relay and a main transformer low-voltage side relay, respectively. The main transformer high-voltage side relay is used to control the switching state of the high-voltage side circuit of the main transformer, and the main transformer low-voltage side relay is used to control the switching state of the low-voltage side circuit of the main transformer; The control module is also connected to the main transformer high-voltage side relay and the main transformer low-voltage side relay respectively. The control module is also used to control the main transformer high-voltage side relay and the main transformer low-voltage side relay to disconnect when receiving a fault signal of the main transformer.

3. The oil pump control device according to claim 2, wherein: The main transformer high-voltage side relay includes a first main transformer high-voltage side relay and a second main transformer high-voltage side relay, the high-voltage side circuit includes a first high-voltage side circuit and a second high-voltage side circuit, the first main transformer high-voltage side relay is used to control the switching state of the first high-voltage side circuit, and the second main transformer high-voltage side relay is used to control the switching state of the second high-voltage side circuit; The control module is further configured to control the first main transformer high-voltage side relay and the second main transformer high-voltage side relay to be disconnected when receiving a fault signal of the main transformer.

4. The oil pump control device according to claim 2 or 3, characterized in that: The control module is a GPA protection device.

5. The oil pump control device according to claim 1, wherein: The control module is also connected to the high-voltage side circuit of the main transformer. The main transformer, the control module and the high-voltage side circuit form a high-voltage power supply circuit. The control module is also used to disconnect the high-voltage power supply circuit when receiving a fault signal from the main transformer.

6. The oil pump control device according to claim 5, characterized in that: The control module is the GIS circuit breaker at the high voltage side outlet of the main transformer.

7. The oil pump control device according to claim 1, wherein: The main transformer is connected to a main transformer high-voltage side relay and a main transformer low-voltage side relay, respectively. The main transformer high-voltage side relay is used to control the switching state of the high-voltage side circuit of the main transformer, and the main transformer low-voltage side relay is used to control the switching state of the low-voltage side circuit of the main transformer; The control module is also connected to the main transformer high-voltage side relay and the main transformer low-voltage side relay respectively, and the control module is also used to determine that a fault signal of the main transformer is received when a disconnection signal of the main transformer high-voltage side relay and the main transformer low-voltage side relay is received.

8. The oil pump control device according to claim 7, wherein: The control module is a DCS system.

9. An oil pump control system based on a nuclear power main transformer, characterized in that: include: The oil pump control device and oil pump according to any one of claims 1 to 8, wherein the oil pump is connected to the oil pump relay.

10. The oil pump control system according to claim 9, characterized in that: The oil pump control system further includes a main transformer, a main transformer high-voltage side relay, and a main transformer low-voltage side relay. The main transformer is connected to the main transformer high-voltage side relay and the main transformer low-voltage side relay respectively.

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