哈三电厂600MW发电机100%定子接地保护拒动分析

Analysis on Operation Rejection of 100% Stator Ground Protection for 600 MW Generator of Harbin No.3 Power Plant

哈三 60 0MW发电机 ,是采用分谐波电压注入式 (又称 1 2 5Hz注入式 )原理的 1 0 0 %定子接地保护装置。本文详细地分析了该保护装置在发电机定子接地故障中拒动的原因。并简要说明这种原理的接地保护在小电流接地系统中应用的注意事项。

MW generator of Harbin No.3 Power Plant adopts 100% stator ground protection with the principle of fractional harmonic voltage injection (or 12 5Hz injection type).This paper analyses detailedly the cause of operation rejection of protective device.And illustrates briefly the attentions for such ground protection applied in small current neutral grounding system.