A logic method for guide vane feedback fault judgment

Abstract

The invention provides a guide vane feedback fault judgment logic method which judges faults according to feedback signals of guide vane displacement sensors of a first feedback guide vane and a second feedback guide vane. The guide vane feedback fault judgment logic method comprises the following steps of A1, setting the feedback interval travel value of the first feedback guide vane as dWG1, thefeedback interval travel value of the second feedback guide vane as dWG2 and the opening degree distance value between the first feedback guide vane and the second feedback guide vane as dt, obtaining the ratio of dWG1 to dt and the ratio of dWG2 to dt, performing differential on the obtained ratios, and defining the obtained differential result values as dWG1 / dt, dWG2 / dt and dWG_SP / dt; A2, if the second feedback guide vane has no fault, the phenomena that dWG1 / dt is smaller than or equal to 0.1 and dWG2 / dt and dWG_SP / dt are both larger than or equal to 0.3 occur and the state is maintained till a first time threshold value, judging that the feedback of the first feedback guide vane has faults; and A3, if the first feedback guide vane has no fault, the phenomena that dWG2 / dt is smaller than or equal to 0.1 and dWG1 / dt and dWG_SP / dt are both larger than or equal to 0.3 occur and the state is maintained till a second time threshold value, judging that the feedback of the second feedbackguide vane has faults. The guide vane feedback fault judgment logic method can optimize the guide vane fault diagnosis work.

Description

technical field [0001] The invention relates to the technical field of electric power equipment, in particular to a guide vane feedback fault judging logic method. Background technique [0002] The guide vane feedback signal is a core signal of the turbine governor control system. The governor control system is generally equipped with 2 guide vane feedback signals. Feedback signal, if the two guide vane feedback signals have a feedback failure, the unit will mechanically trip. The guide vane feedback signal is generated by the guide vane displacement sensor. The guide vane displacement sensor can be a hysteresis displacement sensor. The sensor sends a feedback signal to the guide vane of the electric control cabinet by detecting the distance traveled by the magnetic slider connected to the servomotor. [0003] The guide vane feedback fault judgment logic mainly detects whether the channels and hardware of the guide vane feedback signal are normal: the AI ​​module of the gov...

AI Technical Summary

Problems solved by technology

At this time, the guide vane displacement sensor and the feedback channel are not faulty, but the feedback signal is an error signal, which causes the calculation result of the governor control system to be an incorrect value, causing the phenomenon of guide vane out of control and power fluctuation of the unit. Let the guide vane feedback signal switch to the backup sensor

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