Method and device for overtime fault diagnosis of high pressure steam valve test of nuclear power steam turbine

Abstract

The invention relates to a method and a device for diagnosing an overtime fault in a high-pressure steam valve test of a nuclear power steam turbine, which is applied to a high-pressure steam valve control system of a nuclear power steam turbine. The method includes: based on the high-pressure steam valve control system, using a preset method to conduct a valve adjustment test; according to the test results of the valve adjustment test, obtaining a typical curve of the valve adjustment test; analyzing and processing the typical curve to determine the high-pressure steam valve fast closing timeout failure. By adopting this fault diagnosis method, it is possible to quickly determine whether the test is abnormal, and quickly determine the cause of the rapid shutdown overtime fault, and then adopt corresponding processing methods according to the determined fault cause to avoid potential steam turbine overspeed accidents and improve steam turbine. safety and reliability.

Description

technical field [0001] The invention relates to the field of steam turbines of nuclear power plants, and more particularly, to a method and device for diagnosing overtime faults in a high-pressure steam valve test of a nuclear power steam turbine. Background technique [0002] With the development of science and technology, in the field of nuclear power steam turbines, the half-speed steam turbine is put into use first, and then the high-pressure valve group is performing the regular load activity test (GRE01) of the high-pressure steam valve, the high-pressure regulating valve is opened to 19%, and the test solenoid valve (EVS ) After the power is turned on, the high-pressure regulating valve quickly closes to the vicinity of 5% and cannot be closed, which leads to the overtime of the closing time of the high-pressure regulating valve and the early termination of the test procedure, resulting in the failure of the GRE01 test. As the new unit was put into use, the problem of...

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Problems solved by technology

[0002] With the development of science and technology, in the field of nuclear power steam turbines, half-speed steam turbines were put into use first, and then when the high-pressure valve group was performing the regular load test (GRE01) of the high-pressure steam valve, the high-pressure regulating valve was opened to 19%, and the test solenoid valve (EVS ) After power on, the high-pressure regulating valve closes quickly to around 5% and cannot be closed, resulting in the closing time of the high-pressure regulating valve overtime, and the test procedure is terminated in advance, resulting in the failure of the GRE01 test

With the new unit put into use, the test failure problem has developed to multiple high-pressure valve groups of different units, and the number of test failures has increased

[0003] However, the high-pressure control valve closes quickly and overtime, which affects the transient response capability of the unit, and has potential hidden dangers of overspeed accidents of the steam turbine unit.

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