一起发电机转子接地保护的动作行为分析

Analysis on Action of Ground Protection for Generator Rotor

对一起因发电机励磁电压故障录波回路虚焊引起的注入方波电压型转子接地保护动作进行分析,认为由于转子对地电容的存在,当模拟接地位置α变化时,注入方波电压型转子接地保护的计算公式已不再适用,并从设计、应用等方面提出了改进建议。

This paper analyzes the action of injecting square wave voltage type ground protection of rotor caused by a poor soldering on the circuit of fault recorder for generator excitation voltage.It is found that the calculation formula for this type of ground protection is no longer applicable when the simulation grounding position parameter α varies due to the existence of rotor earth capacitance.And the suggestions on improvement in design,application etc.are proposed.