Main steam isolation valve quick closing solenoid valve automatic calibration device, system and calibration method

Abstract

The present application relates to the technical field of maintenance, and especially relates to a main steam isolation valve quick closing electromagnetic valve automatic calibration device, system and calibration method. The device comprises: an MSIV simulation body oil inlet circuit connected with an oil tank through a booster pump, an MSIV simulation body oil return circuit controlled through a first pressure relief valve and a second pressure relief valve, an oil return end of the MSIV simulation body connected in series with the first pressure relief valve, the second pressure relief valve, a flow control valve and the oil tank; a first quick closing electromagnetic valve connected with the first pressure relief valve; a second quick closing electromagnetic valve connected with the second pressure relief valve; a slow closing electromagnetic valve connected with the MSIV simulation body and the oil tank. The system is a corresponding control system of the calibration device. The automatic calibration of the quick closing electromagnetic valve can be completed by using the device. The present application simulates the actual operation condition, tests the comprehensive performance of the MSIV quick closing electromagnetic valve, and then guides the subsequent maintenance direction of the electromagnetic valve, so that blind maintenance and wrong maintenance are effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of maintenance technology, and in particular to an automatic calibration device, system, and calibration method for the main steam isolation valve quick-closing solenoid valve. Background Technology

[0002] The main steam isolation valve (MSIV) is used in the secondary loop main steam system of a pressurized water reactor nuclear power plant. It is one of the key valves in the nuclear power plant. Under steady-state operating conditions, it is in the open state. Under expected normal or accident operating conditions, it automatically and quickly closes within 5 seconds after receiving the main steam isolation signal to quickly isolate the main steam.

[0003] The MSIV hydraulic system operates at high pressures (over 20 MPa) and high temperatures. As precision devices, the performance of solenoid valves changes over time, necessitating regular maintenance. Based on power plant operating experience, during MSIV operation, fast-closing solenoid valves may experience malfunctions such as excessively long operating times, leakage, failure to operate, or accidental operation. These issues directly impact the normal operation of the MSIV, severely affecting unit safety and stability, leading to unit degradation, and even shutdown or reactor failure.

[0004] Since most fast-closing solenoid valves are imported, their replacement costs are high and the procurement cycle is long. Replacing them entirely would greatly increase the unit's maintenance costs. Therefore, it is necessary to conduct performance testing on solenoid valves. By inventing an MSIV fast-closing solenoid valve automatic calibration device, we can guide the subsequent maintenance work of solenoid valves and improve the efficiency of maintenance work. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide an automatic calibration device, system and calibration method for the main steam isolation valve fast-closing solenoid valve, to simulate actual operating conditions, to test the comprehensive performance of the MSIV fast-closing solenoid valve, and to guide the subsequent maintenance of the solenoid valve, and finally to verify whether the performance of the repaired solenoid valve is qualified, effectively avoiding blind repair and incorrect repair.

[0006] This invention provides an automatic calibration device for a main steam isolation valve fast-closing solenoid valve, comprising:

[0007] The MSIV simulator's oil inlet circuit is connected to the oil tank via a booster pump.

[0008] The MSIV simulator's return oil circuit is controlled by a first pressure relief valve and a second pressure relief valve. The return oil end of the MSIV simulator is connected in series with the first pressure relief valve, the second pressure relief valve, the flow control valve, and the oil tank.

[0009] The first fast-closing solenoid valve is connected to the first pressure relief valve to control its opening and closing; the second fast-closing solenoid valve is connected to the second pressure relief valve to control its opening and closing.

[0010] The slow-closing solenoid valve has its inlet connected to the outlet of the MSIV simulator, and its outlet connected to the oil tank.

[0011] Preferably, the booster pump includes multiple booster pumps connected in parallel, which are redundant with each other;

[0012] The booster pump is also connected to an intake solenoid valve, and the intake solenoid valve and the booster pump are integrated into one unit.

[0013] Preferably, it also includes a pressure regulating valve and a mechanical safety valve, wherein the inlet of the pressure regulating valve is connected to the outlet of the booster pump, and the outlet is connected to the oil tank;

[0014] The inlet of the mechanical safety valve is connected to the outlet of the booster pump, and the outlet is connected to the oil tank.

[0015] Preferably, both the first pressure relief valve and the second pressure relief valve are designed with displacement measuring elements. The displacement of the first pressure relief valve is arranged in the outer control valve block of the first pressure relief valve to characterize the operation of the first pressure relief valve.

[0016] The displacement of the second pressure relief valve is arranged inside the external control valve block of the second pressure relief valve, which is used to measure the operation of the second pressure relief valve.

[0017] This invention provides an automatic calibration system for a main steam isolation valve fast-closing solenoid valve, comprising:

[0018] The control system implements corresponding logical functions through human-machine interfaces and controllers;

[0019] The controller includes a solenoid valve voltage characteristic test module, a solenoid valve current characteristic test module, a complete set of valve closing time test module, a single valve closing time test module, a pressure relief valve action displacement test module, an MSIV simulator load test module, and an MSIV simulator activity test module.

[0020] The solenoid valve voltage characteristic test module and the solenoid valve current characteristic test module are used to test the performance of solenoid valves.

[0021] The complete valve closing time test module and the single valve closing time test module are used to test the fast closing time.

[0022] The pressure relief valve displacement test module is used for testing pressure relief valves.

[0023] The MSIV simulator load test module and the MSIV simulator activity test module are used for MSIV simulator functional testing.

[0024] This invention also provides an automatic calibration method for the fast-closing solenoid valve of the main steam isolation valve, comprising the following steps:

[0025] Connect the new quick-closing solenoid valve to the corresponding position of the device described in the above technical solution, and use the device to test the voltage characteristics, current characteristics, valve closing time of the complete set, valve closing time of a single valve, and pressure relief valve displacement, and record the relevant test results.

[0026] Connect the fast-closing solenoid valve to be tested to the corresponding position of the device, and use the device to test the voltage characteristics, current characteristics, valve closing time of the complete set, single valve closing time, pressure relief valve displacement, and MSIV simulator function, and record the relevant test results.

[0027] The test results of the quick-closing solenoid valve to be tested are compared one by one with the test results of the brand new quick-closing solenoid valve or the required performance indicators of the quick-closing solenoid valve. If the test results of the quick-closing solenoid valve to be tested are consistent with the required performance indicators or are within a reasonable error range, the quick-closing solenoid valve to be tested is determined to have passed the verification.

[0028] If the test results of the fast-closing solenoid valve exceed the reasonable error range compared with the required performance indicators, the verification is deemed to have failed.

[0029] Test the functionality of the MSIV simulator and confirm its status.

[0030] Preferably, the method for determining the voltage characteristics of the solenoid valve is as follows: by adjusting the fast-closing solenoid valve, the excitation threshold voltage trend value and the demagnetization threshold voltage trend value are determined respectively.

[0031] The method for determining the current characteristics of the solenoid valve is as follows: by adjusting the fast-closing solenoid valve, the excitation threshold current trend value and the demagnetization threshold current trend value are determined respectively.

[0032] Preferably, the method for determining the voltage characteristics of the solenoid valve is as follows:

[0033] Gradually increase the fast-closing valve voltage of the first fast-closing solenoid valve, observe the displacement action of the first pressure relief valve, and confirm the excitation threshold voltage trend value of the first fast-closing solenoid valve.

[0034] Gradually reduce the fast-closing valve voltage of the first fast-closing solenoid valve, observe the displacement action of the first pressure relief valve, and confirm the demagnetization threshold voltage trend value of the first fast-closing solenoid valve.

[0035] Gradually increase the fast-closing valve voltage of the second fast-closing solenoid valve, observe the displacement action of the pressure relief valve on the second pressure relief valve, and confirm the excitation threshold voltage trend value of the second fast-closing solenoid valve.

[0036] Gradually reduce the fast-closing valve voltage of the second fast-closing solenoid valve, observe the displacement action of the pressure relief valve on the second pressure relief valve, and confirm the demagnetization threshold voltage trend value of the second fast-closing solenoid valve.

[0037] The specific method for determining the current characteristics of the solenoid valve is as follows:

[0038] Gradually increase the fast-closing valve current of the first fast-closing solenoid valve, observe the displacement action of the first pressure relief valve, and confirm the excitation threshold current trend value of the first fast-closing solenoid valve.

[0039] Gradually reduce the fast-closing valve current of the first fast-closing solenoid valve, observe the displacement action of the first pressure relief valve, and confirm the demagnetization threshold current trend value of the first fast-closing solenoid valve.

[0040] Gradually increase the fast-closing valve current of the second fast-closing solenoid valve, observe the displacement action of the pressure relief valve on the second pressure relief valve, and confirm the excitation threshold current trend value of the second fast-closing solenoid valve action.

[0041] Gradually reduce the fast-closing valve current of the second fast-closing solenoid valve, observe the displacement action of the pressure relief valve on the second pressure relief valve, and confirm the demagnetization threshold current trend value of the second fast-closing solenoid valve.

[0042] Preferably, the test method for the closing time of the complete set of valves is as follows:

[0043] Open the MSIV simulator and de-energize the intake solenoid valve; energize both the first and second fast-closing solenoid valves simultaneously; adjust the flow control valve to ensure the fast-closing time meets the MSIV fast-closing requirements; record the flow control valve position and the overall closing time.

[0044] The test method for the single valve closing time is as follows:

[0045] Open the MSIV simulator; simultaneously de-energize the intake solenoid valve; energize and open the first quick-closing solenoid valve, and confirm that the first pressure relief valve is open by observing the pressure relief displacement; confirm that the pressure relief header pressure has reached the set value.

[0046] Energize the second fast-closing solenoid valve and record the time from when the second fast-closing solenoid valve is energized to when the MSIV simulator closes; similarly, energize the second fast-closing solenoid valve to open it, and confirm that the second pressure relief valve is open by observing the pressure relief displacement; energize the first fast-closing solenoid valve and record the time from when the first fast-closing solenoid valve is energized to when the MSIV simulator closes.

[0047] Preferably, the test method for the displacement of the pressure relief valve is as follows:

[0048] Energize the first quick-closing solenoid valve and observe the pressure relief displacement to confirm the opening status of the first pressure relief valve; de-energize the first quick-closing solenoid valve and observe the pressure relief displacement to confirm the closing status of the first pressure relief valve.

[0049] Energize the second quick-closing solenoid valve and observe the pressure relief displacement to confirm the opening status of the second pressure relief valve; de-energize the second quick-closing solenoid valve and observe the pressure relief displacement to confirm the closing status of the second pressure relief valve.

[0050] Preferably, the testing of the MSIV simulator's functionality includes MSIV simulator load testing and MSIV simulator activity testing;

[0051] The method for load testing of the MSIV simulator is as follows:

[0052] After confirming that the MSIV simulator is open, energize the first fast-closing solenoid valve and observe the pressure relief displacement to confirm that the first pressure relief valve is open. Observe that the pressure in the pressure relief header rises significantly. After 60 seconds, de-energize the first fast-closing solenoid valve, and the first pressure relief valve closes. After 150 seconds, energize the second fast-closing solenoid valve and observe the pressure relief displacement to confirm that the second pressure relief valve is open. Observe that the pressure in the pressure relief header is lower than the set value. After 60 seconds, de-energize the second fast-closing solenoid valve, and the second pressure relief valve closes. Confirm that MSIV simulator 1 remains open. The load test is successful, and the test ends.

[0053] The method for testing the activity of MSIV simulators is as follows:

[0054] Once the MSIV simulator is confirmed to be open, energize the slow-closing solenoid valve. The MSIV simulator will slowly close. When the MSIV simulator is 90% closed, de-energize the slow-closing solenoid valve. The MSIV simulator will then open, indicating successful MSIV simulator operation. The test is now complete.

[0055] Compared with the prior art, the automatic calibration device, system and calibration method for the main steam isolation valve fast-closing solenoid valve of the present invention have the following advantages:

[0056] (1) Perform calibration of important control devices in MSIV, such as fast-closing solenoid valves and pressure relief valves, and conduct load and activity tests on MSIV simulators by measuring the closing time of MSIV simulators to confirm whether there are any leaks in the relevant components.

[0057] (2) It can record the action of the solenoid valve in real time and measure the action time of the solenoid valve in milliseconds;

[0058] (3) This calibration device can record the displacement of the pressure relief valve;

[0059] (4) This calibration device can perform calibration of individual or complete sets of solenoid valves;

[0060] (5) This calibration device can simulate the load function test and active function test of MSIV;

[0061] (6) The calibration device enables automatic calibration of solenoid valves and can automatically generate corresponding calibration reports. Attached Figure Description

[0062] Figure 1 This diagram illustrates the structure of the automatic calibration device for the main steam isolation valve's fast-closing solenoid valve.

[0063] Figure 2 This diagram illustrates the control of the automatic calibration device for the main steam isolation valve's fast-closing solenoid valve.

[0064] In the picture,

[0065] 1-MSIV simulator; 2-oil tank; 3-boost pump; 4-boost pump; 5-first intake solenoid valve; 6-second intake solenoid valve; 7-first pressure relief valve; 8-second pressure relief valve; 9-first quick-closing solenoid valve; 10-second quick-closing solenoid valve; 11-pressure regulating valve; 12-mechanical safety valve; 13-slow-closing solenoid valve; 14-flow control valve; 15-mechanical spring;

[0066] 100-Control System; 101-Human Machine Interface; 102-Controller; 111-Solenoid Valve Voltage Characteristic Test Module; 112-Solenoid Valve Current Characteristic Test Module; 121-Complete Valve Closing Time Test Module; 122-Single Valve Closing Time Test Module; 131-Pressure Relief Valve Displacement Test Module; 141-MSIV Simulator Load Test Module; 142-MSIV Simulator Activity Test Module. Detailed Implementation

[0067] To further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the present invention.

[0068] The automatic calibration device for the main steam isolation valve quick-closing solenoid valve of the present invention simulates actual operating conditions, tests the comprehensive performance of the MSIV quick-closing solenoid valve, and guides the subsequent maintenance of the solenoid valve. Finally, it verifies whether the performance of the repaired solenoid valve is qualified, effectively avoiding blind and incorrect repairs. It can also test newly added spare parts and pressure relief valves to check their availability.

[0069] In this invention, the MSIV simulator 1 is scaled down proportionally according to the mechanical characteristics of the MSIV to simulate its mechanical performance and operation, ensuring that the process state during the operation of the fast-closing solenoid valve is the same as the actual situation of the MSIV. When the lower part of the cylinder of the MSIV simulator 1 is filled with oil, it will overcome the force of the mechanical spring 15 and open the MSIV simulator 1; conversely, when the lower part of the cylinder is unloaded, the MSIV simulator 1 closes.

[0070] An embodiment of the present invention discloses an automatic calibration device for a main steam isolation valve fast-closing solenoid valve, such as... Figure 1 As shown, it includes:

[0071] MSIV simulator 1, the oil inlet circuit of MSIV simulator 1 is connected to oil tank 2 via a booster pump.

[0072] Fuel tank 2 is used to store high-pressure fire-resistant oil. It has reasonable barriers and vent holes inside to effectively prevent oil spillage caused by rapid unloading during the MSIV quick-closing process.

[0073] The booster pump provides a reliable power source and ensures that the system's power air pressure and hydraulic pressure ratio are within the specified range.

[0074] The booster pump includes multiple booster pumps connected in parallel, which are redundant with each other; preferably, it includes two booster pumps connected in parallel, a first booster pump 3 and a second booster pump 4.

[0075] The booster pump is also connected to an intake solenoid valve, which is integrated with the booster pump. The first booster pump 3 is connected to a first intake solenoid valve 5, which controls the first booster pump 3; the second booster pump 4 is connected to a second intake solenoid valve 6, which controls the second booster pump 4.

[0076] When the intake solenoid valve is energized and opened, the corresponding booster pump starts; when the intake manifold reaches the set intake pressure, the corresponding booster pump stops.

[0077] In the oil inlet circuit, when MSIV simulator 1 is opened, high-pressure fire-resistant oil is introduced from oil tank 2 through first booster pump 3 and second booster pump 4; when MSIV simulator 1 is closed, high-pressure fire-resistant oil returns to oil tank 2.

[0078] The return oil circuit of MSIV simulator 1 is controlled by the first pressure relief valve 7 and the second pressure relief valve 8. The return oil end of MSIV simulator 1 is connected in series with the first pressure relief valve 7, the second pressure relief valve 8, the flow control valve 14 and the oil tank 2.

[0079] The first fast-closing solenoid valve 9 is connected to the first pressure relief valve 7 to control its opening and closing; the second fast-closing solenoid valve 10 is connected to the second pressure relief valve 8 to control its opening and closing.

[0080] The operation of the first fast-closing solenoid valve 9 is characterized by its fast-closing valve current and voltage; the operation of the second fast-closing solenoid valve 10 is characterized by its fast-closing valve ammeter and voltage. When both the first and second fast-closing solenoid valves 9 and 10 are energized, the corresponding first and second pressure relief valves 7 and 8 open simultaneously. The fire-resistant oil in the lower cylinder of the MSIV simulator 1 flows back to the oil tank 2 through the flow control valve 14, and the MSIV simulator 1 closes rapidly under the action of the mechanical spring 15. When only the first or second fast-closing solenoid valve 9 is energized, since only one pressure relief valve is open in the return oil circuit, the high-pressure fire-resistant oil in the lower cylinder of the MSIV simulator 1 will not be discharged into the oil tank 2, and the MSIV simulator 1 remains open. When the first and second fast-closing solenoid valves 9 and 10 open successively, the pressure relief oil also returns to the oil tank 2.

[0081] The slow-closing solenoid valve 13 is used to control the MSIV simulator 1 to close slowly. Its inlet is connected to the outlet of the MSIV simulator 1, and its outlet is connected to the oil tank 2.

[0082] The flow control valve 14 controls the oil discharge flow through the pressure relief valve 7 and the pressure relief valve 8 through its internal mechanical structure, and ultimately controls the fast closing time of the MSIV simulator 1. The flow control valve 14 is connected to the outlet of the second pressure relief valve 8 and the oil tank 2 respectively, and controls the oil discharge flow through the first pressure relief valve 7 and the second pressure relief valve 8 through its internal mechanical structure.

[0083] It also includes a pressure regulating valve 11 and a mechanical safety valve 12.

[0084] The pressure regulating valve 11 is used to control the outlet pressure of booster pump 3 and booster pump 4. Its inlet is connected to the outlet of the booster pump, and its outlet is connected to the oil tank 2 to ensure that the pump outlet pressure is stable.

[0085] The inlet of the mechanical safety valve 12 is connected to the outlet of the booster pump, and the outlet is connected to the oil tank 2 to prevent excessive pressure at the pump outlet from causing overpressure damage to related equipment on the oil circuit of the testing device.

[0086] In this invention, both the first pressure relief valve 7 and the second pressure relief valve 8 are designed with displacement measuring elements. The displacement of the first pressure relief valve is arranged in the outer control valve block of the first pressure relief valve 7 to characterize the operation of the first pressure relief valve.

[0087] The displacement of the second pressure relief valve is arranged inside the external control valve block of the second pressure relief valve 8, which is used to measure the operation of the second pressure relief valve.

[0088] An embodiment of the present invention discloses an automatic calibration system for a main steam isolation valve fast-closing solenoid valve, such as... Figure 2 As shown, it includes:

[0089] The control system 100 implements corresponding logical functions through the human-machine interface 101 and the controller 102;

[0090] The controller 102 includes a solenoid valve voltage characteristic test module 111, a solenoid valve current characteristic test module 112, a complete set of valve closing time test module 121, a single valve closing time test module 122, a pressure relief valve action displacement test module 131, an MSIV simulator load test module 141, and an MSIV simulator activity test module 142.

[0091] The solenoid valve voltage characteristic test module 111 and the solenoid valve current characteristic test module 112 are used to test the performance of the solenoid valve.

[0092] The complete valve closing time test module 121 and the single valve closing time test module 122 are used to test the fast closing time.

[0093] The pressure relief valve displacement test module 131 is used for pressure relief valve testing.

[0094] MSIV simulator load test module 141 and MSIV simulator activity test module 142 are used for MSIV simulator functional testing.

[0095] This calibration device is a portable test bench integrating a hydraulic system, an electrical control system, and host computer software. The device can test the performance of a single solenoid valve or a set (two) of quick-closing solenoid valves. Operators can perform tests on solenoid valve voltage characteristics, current characteristics, MSIV simulator closing time, pressure relief valve displacement, MSIV simulator under load, and MSIV simulator movement by using basic software operations and settings. By measuring the starting voltage and current of the quick-closing solenoid valve, the pressure relief valve displacement, and the MSIV simulator closing time, the device can determine the solenoid valve's characteristic parameters. After the test, the device automatically generates a solenoid valve calibration report and determines whether the solenoid valve performance meets the requirements.

[0096] This verification device has the following characteristics:

[0097] (1) It can perform performance testing of the main steam isolation valve fast-closing solenoid valve, wherein the calibration device withstands pressure up to 40MPa and the sampling accuracy of the action time reaches millisecond level.

[0098] (2) Applicable to the inspection and calibration of multiple devices such as pressure relief valves and quick-closing solenoid valves.

[0099] (3) It can simulate the actual operation of the relevant fast-closing solenoid valve and pressure relief valve when MSIV closes quickly.

[0100] (4) It can conduct MSIV simulation function tests, including load function tests and active function tests.

[0101] (5) Through the control system, the detection process can be monitored, trend graphs can be generated, data can be analyzed, and reports can be printed.

[0102] This invention also discloses an automatic calibration method for the fast-closing solenoid valve of the main steam isolation valve, comprising the following steps:

[0103] Connect the new quick-closing solenoid valve to the corresponding position of the device described in the above technical solution, and use the device to test the voltage characteristics, current characteristics, valve closing time of the complete set, valve closing time of a single valve, and pressure relief valve displacement, and record the relevant test results.

[0104] Connect the fast-closing solenoid valve to be tested to the corresponding position of the device, and use the device to test the voltage characteristics, current characteristics, valve closing time of the complete set, single valve closing time, pressure relief valve displacement, and MSIV simulator function, and record the relevant test results.

[0105] The test results of the quick-closing solenoid valve to be tested are compared one by one with the test results of the brand new quick-closing solenoid valve or the required performance indicators of the quick-closing solenoid valve. If the test results of the quick-closing solenoid valve to be tested are consistent with the required performance indicators or are within a reasonable error range, the quick-closing solenoid valve to be tested is deemed to have passed the verification.

[0106] If the test results of the fast-closing solenoid valve exceed the reasonable error range compared with the required performance indicators, the verification is deemed to have failed.

[0107] Test the functionality of the MSIV simulator and confirm its status.

[0108] The normal opening procedure for MSIV simulator 1 is as follows: When the first intake solenoid valve 5 and the second intake solenoid valve 6 are energized, the first booster pump 3 and the second booster pump 4 automatically start, and fire-resistant oil from the oil tank 2 enters the lower part of MSIV simulator 1, overcoming the resistance of the mechanical spring 15 at the top of the cylinder to open MSIV simulator 1. The pressure regulating valve 11 is used to ensure that the pressure of the lower cylinder of MSIV simulator 1 is stable; the mechanical safety valve 12 is used to ensure that the outlet pressure of the pump at the bottom of MSIV simulator 1 does not exceed the safety value.

[0109] The normal closing process of MSIV simulator 1 is as follows: the slow-closing solenoid valve 13 is energized and opened, the first intake solenoid valve 5 and the second intake solenoid valve 6 are de-energized and closed, the first booster pump 3 and the second booster pump 4 stop operating, the fire-resistant oil in the lower part of MSIV simulator 1 flows back to the fuel tank 2 through the slow-closing solenoid valve 13, and MSIV simulator 1 closes under the action of mechanical spring 15.

[0110] The process of rapid closing of MSIV simulator 1 is as follows: the first intake solenoid valve 5 and the second intake solenoid valve 6 are de-energized at the same time, the first fast-closing solenoid valve 9 and the second fast-closing solenoid valve 10 are energized at the same time, the first pressure relief valve 7 and the second pressure relief valve 8 are opened at the same time, the fire-resistant oil in the lower part of MSIV simulator 1 flows back to the fuel tank 2 rapidly, and MSIV simulator 1 is rapidly closed under the action of mechanical spring 15.

[0111] The method for determining the voltage characteristics of the solenoid valve is as follows: by adjusting the fast-closing solenoid valve, the excitation threshold voltage trend value and the demagnetization threshold voltage trend value are determined respectively.

[0112] Specifically, gradually increase the fast-closing valve voltage of the first fast-closing solenoid valve 9, observe the displacement action of the pressure relief valve on the first pressure relief valve 7, and confirm the excitation threshold voltage trend value of the first fast-closing solenoid valve 9.

[0113] Gradually reduce the fast-closing valve voltage of the first fast-closing solenoid valve 9, observe the displacement action of the first pressure relief valve 7, and confirm the demagnetization threshold voltage trend value of the first fast-closing solenoid valve 9.

[0114] Gradually increase the fast-closing valve voltage of the second fast-closing solenoid valve 10, observe the displacement action of the pressure relief valve on the second pressure relief valve 8, and confirm the excitation threshold voltage trend value of the second fast-closing solenoid valve 10.

[0115] Gradually reduce the fast-closing valve voltage of the second fast-closing solenoid valve 10, observe the displacement action of the pressure relief valve 8, and confirm the demagnetization threshold voltage trend value of the second fast-closing solenoid valve 10.

[0116] The method for determining the current characteristics of the solenoid valve is as follows: by adjusting the fast-closing solenoid valve, the excitation threshold current trend value and the demagnetization threshold current trend value are determined respectively.

[0117] Specifically, the method for determining the current characteristics of the solenoid valve is as follows:

[0118] Gradually increase the fast-closing valve current of the first fast-closing solenoid valve 9, observe the displacement action of the pressure relief valve on the first pressure relief valve 7, and confirm the excitation threshold current trend value of the first fast-closing solenoid valve 9.

[0119] Gradually reduce the fast-closing valve current of the first fast-closing solenoid valve 9, observe the displacement action of the first pressure relief valve 7, and confirm the demagnetization threshold current trend value of the first fast-closing solenoid valve 9.

[0120] Gradually increase the fast-closing valve current of the second fast-closing solenoid valve 10, observe the displacement action of the pressure relief valve on the second pressure relief valve 8, and confirm the excitation threshold current trend value of the second fast-closing solenoid valve 10.

[0121] Gradually reduce the fast-closing valve current of the second fast-closing solenoid valve 10, observe the displacement action of the pressure relief valve on the second pressure relief valve 8, and confirm the demagnetization threshold current trend value of the second fast-closing solenoid valve 10.

[0122] The test method for the closing time of the complete set of valves is as follows:

[0123] Open MSIV simulator 1 and de-energize the intake solenoid valve; simultaneously energize the first fast-closing solenoid valve 9 and the second fast-closing solenoid valve 10; adjust the flow control valve 14 to make the fast-closing time meet the MSIV fast-closing requirements; record the position of the flow control valve and the overall closing time.

[0124] The test method for the single valve closing time is as follows:

[0125] Open the MSIV simulator; simultaneously de-energize the intake solenoid valve; energize and open the first quick-closing solenoid valve, and confirm that the first pressure relief valve is open by observing the pressure relief displacement; confirm that the pressure relief header pressure has reached the set value.

[0126] Energize the second fast-closing solenoid valve and record the time from when the second fast-closing solenoid valve is energized to when the MSIV simulator closes; similarly, energize the second fast-closing solenoid valve to open it, and confirm that the second pressure relief valve is open by observing the pressure relief displacement; energize the first fast-closing solenoid valve and record the time from when the first fast-closing solenoid valve is energized to when the MSIV simulator closes.

[0127] The test method for the displacement of the pressure relief valve is as follows:

[0128] Energize the first quick-closing solenoid valve 9 and observe the pressure relief displacement to confirm the opening status of the first pressure relief valve 7; de-energize the first quick-closing solenoid valve 9 and observe the pressure relief displacement to confirm the closing status of the first pressure relief valve 7.

[0129] Energize the second quick-closing solenoid valve 10 and observe the pressure relief displacement to confirm the opening status of the second pressure relief valve 8; de-energize the second quick-closing solenoid valve 10 and observe the pressure relief displacement to confirm the closing status of the second pressure relief valve 8.

[0130] The testing of the MSIV simulator's functionality includes MSIV simulator load testing and MSIV simulator activity testing;

[0131] The method for load testing of the MSIV simulator is as follows:

[0132] After confirming that MSIV simulator 1 is open, energize the first fast-closing solenoid valve 9 and observe the pressure relief displacement to confirm that the first pressure relief valve 7 is open. Observe that the pressure in the pressure relief header increases significantly. After 60 seconds, de-energize the first fast-closing solenoid valve 9 and close the first pressure relief valve 7. After 150 seconds, energize the second fast-closing solenoid valve 10 and observe the pressure relief displacement to confirm that the second pressure relief valve 8 is open. Observe that the pressure in the pressure relief header is lower than the set value. After 60 seconds, de-energize the second fast-closing solenoid valve 10 and close the second pressure relief valve 8. Confirm that MSIV simulator 1 remains open. The load test is successful, and the test ends.

[0133] The method for testing the activity of MSIV simulators is as follows:

[0134] Once MSIV simulator 1 is confirmed to be open, the slow-closing solenoid valve 13 is energized, and MSIV simulator 1 slowly closes. When MSIV simulator 1 is 90% closed, the slow-closing solenoid valve 13 is de-energized, MSIV simulator 1 opens, and MSIV simulator 1 is successfully activated. The test is now complete.

[0135] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0136] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic calibration device for a main steam isolation valve fast-closing solenoid valve, characterized in that, include: The MSIV simulator's oil inlet circuit is connected to the oil tank via a booster pump. The MSIV simulator's return oil circuit is controlled by a first pressure relief valve and a second pressure relief valve. The return oil end of the MSIV simulator is connected in series with the first pressure relief valve, the second pressure relief valve, the flow control valve, and the oil tank. The first fast-closing solenoid valve is connected to the first pressure relief valve and controls the opening and closing of the first pressure relief valve; the second fast-closing solenoid valve is connected to the second pressure relief valve and controls the opening and closing of the second pressure relief valve. The slow-closing solenoid valve has its inlet connected to the outlet of the MSIV simulator and its outlet connected to the oil tank. The booster pump includes multiple booster pumps connected in parallel, which are redundant with each other; The booster pump is also connected to an intake solenoid valve, and the intake solenoid valve and the booster pump are integrated into one structure. Both the first pressure relief valve and the second pressure relief valve are designed with displacement measuring elements. The first pressure relief valve has a first pressure relief valve displacement measuring element arranged in the outer control valve block to measure the operation of the first pressure relief valve; the second pressure relief valve has a second pressure relief valve displacement measuring element arranged in the outer control valve block to measure the operation of the second pressure relief valve.

2. The automatic calibration device for the main steam isolation valve fast-closing solenoid valve according to claim 1, characterized in that, It also includes a pressure regulating valve and a mechanical safety valve, wherein the inlet of the pressure regulating valve is connected to the outlet of the booster pump, and the outlet of the pressure regulating valve is connected to the oil tank; The inlet of the mechanical safety valve is connected to the outlet of the booster pump, and the outlet of the mechanical safety valve is connected to the oil tank.

3. An automatic calibration system for a main steam isolation valve fast-closing solenoid valve, characterized in that, include: The control system implements corresponding logical functions through human-machine interfaces and controllers; The controller includes a solenoid valve voltage characteristic test module, a solenoid valve current characteristic test module, a complete set of valve closing time test module, a single valve closing time test module, a pressure relief valve action displacement test module, an MSIV simulator load test module, and an MSIV simulator activity test module. The solenoid valve voltage characteristic test module and the solenoid valve current characteristic test module are used to test the performance of solenoid valves. The complete valve closing time test module and the single valve closing time test module are used to test the fast closing time. The pressure relief valve displacement test module is used for testing pressure relief valves. The MSIV simulator load test module and the MSIV simulator activity test module are used for MSIV simulator functional testing.

4. An automatic calibration method for a main steam isolation valve fast-closing solenoid valve, characterized in that, Includes the following steps: Connect the new quick-closing solenoid valve to the corresponding position of the device described in any one of claims 1 to 3, and use the device to test the voltage characteristics, current characteristics, valve closing time of the complete set of valves, valve closing time of a single valve, and pressure relief valve displacement, and record the relevant test results. Connect the fast-closing solenoid valve to be tested to the corresponding position of the device, and use the device to test the voltage characteristics, current characteristics, valve closing time of the complete set, single valve closing time, pressure relief valve displacement, and MSIV simulator function, and record the relevant test results. The test results of the quick-closing solenoid valve to be tested are compared one by one with the test results of the brand new quick-closing solenoid valve or the required performance indicators of the quick-closing solenoid valve. If the test results of the quick-closing solenoid valve to be tested are consistent with the required performance indicators or are within a reasonable error range, the quick-closing solenoid valve to be tested is determined to have passed the verification. If the test results of the fast-closing solenoid valve exceed the reasonable error range compared with the required performance indicators, the verification is deemed to have failed. Test the functionality of the MSIV simulator and confirm its status.

5. The automatic calibration method for the main steam isolation valve fast-closing solenoid valve according to claim 4, characterized in that, The method for determining the voltage characteristics of the solenoid valve is as follows: by adjusting the fast-closing solenoid valve, the excitation threshold voltage trend value and the demagnetization threshold voltage trend value are determined respectively. The method for determining the current characteristics of the solenoid valve is as follows: by adjusting the fast-closing solenoid valve, the excitation threshold current trend value and the demagnetization threshold current trend value are determined respectively.

6. The automatic calibration method for the main steam isolation valve fast-closing solenoid valve according to claim 4, characterized in that, The specific method for determining the voltage characteristics of the solenoid valve is as follows: Gradually increase the fast-closing valve voltage of the first fast-closing solenoid valve, observe the displacement action of the first pressure relief valve, and confirm the excitation threshold voltage trend value of the first fast-closing solenoid valve. Gradually reduce the fast-closing valve voltage of the first fast-closing solenoid valve, observe the displacement action of the first pressure relief valve, and confirm the demagnetization threshold voltage trend value of the first fast-closing solenoid valve. Gradually increase the fast-closing valve voltage of the second fast-closing solenoid valve, observe the displacement action of the pressure relief valve on the second pressure relief valve, and confirm the excitation threshold voltage trend value of the second fast-closing solenoid valve. Gradually reduce the fast-closing valve voltage of the second fast-closing solenoid valve, observe the displacement action of the pressure relief valve on the second pressure relief valve, and confirm the demagnetization threshold voltage trend value of the second fast-closing solenoid valve. The specific method for determining the current characteristics of the solenoid valve is as follows: Gradually increase the fast-closing valve current of the first fast-closing solenoid valve, observe the displacement action of the first pressure relief valve, and confirm the excitation threshold current trend value of the first fast-closing solenoid valve. Gradually reduce the fast-closing valve current of the first fast-closing solenoid valve, observe the displacement action of the first pressure relief valve, and confirm the demagnetization threshold current trend value of the first fast-closing solenoid valve. Gradually increase the fast-closing valve current of the second fast-closing solenoid valve, observe the displacement action of the pressure relief valve on the second pressure relief valve, and confirm the excitation threshold current trend value of the second fast-closing solenoid valve action. Gradually reduce the fast-closing valve current of the second fast-closing solenoid valve, observe the displacement action of the pressure relief valve on the second pressure relief valve, and confirm the demagnetization threshold current trend value of the second fast-closing solenoid valve.

7. The automatic calibration method for the main steam isolation valve fast-closing solenoid valve according to claim 4, characterized in that, The test method for the closing time of the complete set of valves is as follows: Open the MSIV simulator and de-energize the intake solenoid valve; energize both the first and second fast-closing solenoid valves simultaneously; adjust the flow control valve to ensure the fast-closing time meets the MSIV fast-closing requirements; record the flow control valve position and the closing time of the entire valve assembly. The test method for the single valve closing time is as follows: Open the MSIV simulator; de-energize the intake solenoid valve; energize and open the first quick-closing solenoid valve, and confirm that the first pressure relief valve is open by observing the pressure relief displacement; confirm that the pressure relief header pressure has reached the set value. Energize the second fast-closing solenoid valve and record the time from when the second fast-closing solenoid valve is energized to when the MSIV simulator closes; similarly, energize the second fast-closing solenoid valve to open it, and confirm that the second pressure relief valve is open by observing the pressure relief displacement; energize the first fast-closing solenoid valve and record the time from when the first fast-closing solenoid valve is energized to when the MSIV simulator closes.

8. The automatic calibration method for the main steam isolation valve fast-closing solenoid valve according to claim 4, characterized in that, The test method for the displacement of the pressure relief valve is as follows: Energize the first quick-closing solenoid valve and observe the pressure relief displacement to confirm the opening status of the first pressure relief valve; de-energize the first quick-closing solenoid valve and observe the pressure relief displacement to confirm the closing status of the first pressure relief valve. Energize the second quick-closing solenoid valve and observe the pressure relief displacement to confirm the opening status of the second pressure relief valve; de-energize the second quick-closing solenoid valve and observe the pressure relief displacement to confirm the closing status of the second pressure relief valve.

9. The automatic calibration method for the main steam isolation valve fast-closing solenoid valve according to claim 4, characterized in that, The testing of the MSIV simulator's functionality includes MSIV simulator load testing and MSIV simulator activity testing; The method for load testing of the MSIV simulator is as follows: After confirming that the MSIV simulator is open, energize the first fast-closing solenoid valve and observe the pressure relief displacement to confirm that the first pressure relief valve is open. Observe that the pressure in the pressure relief header rises significantly. After 60 seconds, de-energize the first fast-closing solenoid valve, and the first pressure relief valve will close. After 150 seconds, energize the second fast-closing solenoid valve and observe the pressure relief displacement to confirm that the second pressure relief valve is open. Observe that the pressure in the pressure relief header is lower than the set value. After 60 seconds, de-energize the second fast-closing solenoid valve, and the second pressure relief valve will close. Confirm that the MSIV simulator remains open. The load test is successful, and the test ends. The method for testing the activity of MSIV simulators is as follows: Once the MSIV simulator is confirmed to be open, energize the slow-closing solenoid valve. The MSIV simulator will slowly close. When the MSIV simulator is 90% closed, de-energize the slow-closing solenoid valve. The MSIV simulator will then open, indicating successful MSIV simulator operation. The test is now complete.

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