【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。更多还原

【Abstract】 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.更多还原