基于3次谐波电压故障暂态分量的定子单相接地保护  

PROTECTI ON SCHEME BASED ON FAULT TRANSIENT COMPONENT OF THIRD HARMONIC VOLTAGE FOR STAT OR GROUND FAULT OF GENERATORS

作　　者：毕大强[1] 王祥珩[1] 王维俭[1] 

机构地区：[1]清华大学电机系,北京市100084

出　　处：《电力系统自动化》2003年第13期45-49,共5页Automation of Electric Power Systems

摘　　要：在分析发电机定子单相接地故障产生的故障暂态分量信息特征的基础上 ,提出了一种定子单相接地暂态保护方案。该保护方案根据单相接地故障后机端和中性点 3次谐波电压的故障暂态分量近似相同的特点 ,把两个故障分量的相量和与相量差分别作为保护动作信号及制动信号 ,通过比较数据窗内相应信号的谱能量检测定子单相接地故障。仿真和试验结果表明新的暂态保护判据灵敏度高 ,不受发电机运行工况的影响 。This paper puts forward a transient based protection scheme for the stator ground fault of generator. The fault transient component of third harmonic voltage at neutral is approximately equal to that at terminal. Choosing their sum and difference as the action and restraint signal respectively, the protection detects the ground fault by comparing the spectrum energy of action and restraint signals. The results of simulation and experiment verify the novel protection scheme is with high sensitivity, is immune to the operating condition of generator, and is of robustness.

关 键 词：发电机保护 定子接地保护 3次谐波电压 故障分量 

分 类 号：TM31[电气工程—电机]