Method for ensuring normal starting of unit in case of loss of position signals of bypass valve of main water inlet valve

Abstract

The invention relates to the technical field of electric power automation, in particular to a method for ensuring the normal starting of a unit in case of loss of position signals of a bypass valve of a main water inlet valve, solves the problem that a hydropower station unit of which the main water inlet valve balances pressure from a low water head to a high water head through the bypass valve fails to be started up under the condition that the signal of a full open position switch is lost after a bypass valve is fully opened, and effectively avoids the phenomenon that the main water inlet valve fails to open due to the accidental fault of the full open position switch of the bypass valve, and an operator can see the signal failure fed back by the full open position switch of the bypass valve from a monitoring picture at the first time, and can have enough time to notice maintenance personnel to maintain and apply for processing. The method is simple, easy, safe and reliable, improves the starting-up success rate greatly, is suitable for the hydropower station unit of which the main water inlet valve balances the pressure from the low water head to the high water head through the bypass valve.

Description

technical field [0001] The invention relates to the technical field of electric automation, in particular to a method for ensuring normal startup of a unit when the position signal of a bypass valve of a main water inlet valve is lost. Background technique [0002] At present, the position switch of the bypass valve is regarded as a necessary condition in the opening condition of the main inlet valve of many power stations. The high head unit has high speed and large vibration. The vibration of the bypass valve is very severe when it is opened. The position switch of the bypass valve works in a harsh In an environment where looseness and damage are unavoidable, when the control system does not receive the feedback signal from the fully open position switch of the bypass valve, it will misjudge that the downstream seal exit condition and the main water inlet valve opening condition are not met, resulting in downstream seal failure. It cannot exit normally, the main water inle...

AI Technical Summary

Problems solved by technology

[0002] At present, the position switch of the bypass valve is regarded as a necessary condition in the opening condition of the main inlet valve of many power stations. The high head unit has high speed and large vibration. The vibration of the bypass valve is very severe when it is opened. The position switch of the bypass valve works in a harsh In an environment where looseness and damage are unavoidable, when the control system does not receive the feedback signal from the fully open position switch of the bypass valve, it will misjudge that the downstream seal exit condition and the main water inlet valve opening condition are not met, resulting in downstream seal failure. Unable to exit normally, the main water inlet valve fails to open, and the unit fails to start

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