提高零序电压式发电机定子接地保护可靠性问题的探讨

Probe into Stability Improvement of Zero Sequence Voltage Type Generator Stator Earthed Protection

基波零序电压式发电机定子接地保护误动几率较高。分析了发电机定子接地保护的交流接入回路、逻辑构成、整定值计算等方面存在的问题,指出了保护误动原因,提出了解决方案。分析认为,对不同机组和不同的接入系统,应采用相应的保护方式,并提出了几点建议供同行参考。

The maloperation rate of base wave zero sequence voltage type generator stator earthed protection is high.Analysis is made to the problems exited in access circuit,logic constitute,setting calculation.The maloperation reasons are pointed out,and solutions are put forward.It is thought that different protection modes shall be adopted for different generators and systems.