由两次区外故障谈定子接地保护定值的校核

基波零序电压型定子接地保护作为发电机的重要保护之一,构成原理简单,整定方便。但是继电保护整定导则中有关于对定子接地保护的校核要求阐述的比较模糊,不利于现场的保护整定。该文结合两次区外故障引起发电机定子接地保护误动的分析,阐述了发电机定子接地保护中基波零序电压定值校核的必要性和方法。

Discussion about settings checking of ground fault protection from two external ground faults

As one of important protections, the principle and settings of zero-sequence fundamental voltage protection are simple and easy. However, the requirement of checking ground fault protection is not clearly described in the guide of relay protection setting, it is not benefit to the settings of protection in practice. By analyzing two external faults causing the maloperation of ground fault protection, this paper represents the necessity and method of checking the setting value of zero-sequence fundamental voltage in ground fault protection for generators.