Overtime fault diagnosis method and device for high-pressure distribution valve of nuclear power steam turbine

Abstract

The invention relates to an overtime fault diagnosis method and device for a high-pressure distribution valve of a nuclear power steam turbine applied to a high-pressure distribution valve control system of the nuclear power stream turbine. The control system comprises a regulation system, an electro-hydraulic proportioning valve, a test solenoid valve, a regulating valve and a stop valve. The method comprises that valve regulation test is carried out in a preset method based on the high-pressure distribution valve control system; according to a result of valve regulation test, a typical curveof valve regulation test is obtained; and the typical curve is analyzed and processed to obtain an overtime fault of rapid closing of the high-pressure distribution valve. Via the fault diagnosis method, test abnormity as well as a reason for the rapid-closing overtime fault can be determined rapidly, a corresponding treatment measure can be taken according to the determined reason for fault, a potential overspeed accident of the steam turbine set can be avoided, and the safety and reliability of the turbine set are improved.

Description

technical field [0001] The invention relates to the field of steam turbines of nuclear power plants, and more specifically relates to a method and device for overtime fault diagnosis of 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, 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 the power is turned on, the high-pressure regulating valve closes quickly to around 5% and cannot be closed, which causes the closing time of the high-pressure regulating valve to be 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 problem of test failu...

AI Technical Summary

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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