摘要
分析了发电机发生定子接地故障后,机端和中性点侧三次谐波电压相角变换的特性。在此基础上,提出基于小波启动的故障分量相角差动定子接地保护新方案,并研制出相应的保护模块。理论分析及实验研究均表明,该方案适用于各种接地方式的发电机,具有更高的灵敏度和可靠性。
This paper analyzes the characteristic of the third-harmonic voltages at the generator neutral and the terminals under different operation conditions. According to that, a new 100% coverage protection scheme based on phase-angle differential of the fault contributed third-harmonic voltage at the terminals and the neutral is presented, and the fault initialized by a wavelet transform start-up component. The corresponding protection equipment is also introduced. Both simulation and experimental results show that the new approach can obtain the high sensitivity and reliability the great generator required.
出处
《电力系统自动化》
EI
CSCD
北大核心
2004年第13期60-63,共4页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50107007)
关键词
定子接地保护
三次谐波零序电压
小波分析
故障分量
stator ground protection
third-harmonic zero-sequence voltage
wavelet transform
fault component
