Optimization of DEH power failure protection of 600MW unit

Abstract

Abstract: The power supply configuration of highpressure fireresistant oil type DEH of Hebei Datang International Wangtan Power Generation Company Limited was introduced, and the implementation of steam turbine tripping shutdown protection scheme when the DEH power supply is failure was described. The defects and the hidden safety hazard in original design scheme were analyzed. The DEH power failure protection scheme was optimized in the unit overhaul. The original single point protection was changed to the ‘two out of three’ and ‘two out of two’protection， the power failure alarm scheme of DEH control cabinet was optimized simultaneously. The safety and the reliability of the unit were improved.

Key words: 600MW unit, digital electro-hydraulic control system (DEH), steam turbine, tripping shutdown protection, protection optimization

ZHOU Shipan;WANG Sheng;HU Minzong. Optimization of DEH power failure protection of 600MW unit[J]. Huadian Technology, 2012, 34(11): 6-9.

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Optimization of DEH power failure protection of 600MW unit

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