The method to ensure the normal start of the unit when the position signal of the bypass valve of the main water inlet valve is lost

Abstract

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. The method of the invention solves the problem that the unit fails to start when the switch signal of the fully open position is lost after the bypass valve is fully opened during the start-up process of the hydropower unit with low water head to high water head and the main water inlet valve is flat-pressed through the bypass valve. Effectively avoid the opening failure of the main water inlet valve caused by the accidental failure of the bypass valve fully open position switch, and the operating personnel can see the feedback signal failure of the bypass valve fully open position switch on the monitoring screen at the first time, which can have sufficient Time Notification Maintenance Request processing during downtime. The method is simple, safe and reliable, greatly improves the success rate of start-up, and is suitable for hydropower station units with low water head to high water head, and the main water inlet valve is flat-pressed 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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