摘要
分析了发电机中性点处配电变压器对外加20 Hz电源定子单相接地保护的影响。基于许继WFB-800型发变组保护硬件平台,研制了考虑中性点配电变压器参数影响的高准确度定子单相接地保护,试验验证了保护中计算接地故障过渡电阻方法的准确性,并分析和给出了防止20 Hz电源及其引线故障误动作的措施。
This paper analyzes the effect of parameters of distribution transformer at the neutral on the stator ground fault protection by injecting 20 Hz voltage. Based on the hardware platform of the Xuji WFB-800 generator-transformer unit protection, a high accuracy stator ground fault protection is developed by considering above parameter effects. The experimental results verify the method of calculating the grounding transition resistance. And some measures are given to prevent the protection from mal-operations caused by the failure of 20 Hz voltage and its lead line.
出处
《电力系统自动化》
EI
CSCD
北大核心
2004年第16期75-78,共4页
Automation of Electric Power Systems
关键词
发电机
外加电源
定子单相接地保护
配电变压器
generator
injection voltage
stator ground fault protection
distribution transformer
