发电机-变压器组500kV断路器断口闪络故障分析  

Analysis of flashover fault for a 500 kV circuit breaker of a generator-transformer unit and its countermeasures

作　　者：郑立[1] 李群炬[1] 梁玉枝[1] 刘苗[1] 赵永林[2] 

机构地区：[1]华北电力科学研究院有限责任公司,北京100045 [2]内蒙古上都发电有限责任公司,内蒙古锡林郭勒027200

出　　处：《中国电力》2010年第2期31-34,共4页Electric Power

摘　　要：大型发电机-变压器组在与系统进行同步并列过程中,有可能发生断路器断口闪络故障。由于机组与系统电压角度差δ的变化,断路器断口间的闪络电流会时大时小。为保证闪络保护及失灵保护可靠动作,闪络保护及失灵保护的整定值不宜整定得过大。根据一个实际故障及现场录波图形,分析探讨闪络保护及失灵保护中负序电流和零序电流元件的整定计算原则,可供整定计算人员参考。In the synchronization process of a large-scale generator-transformer unit and the power system, the circuit breaker fracture may be flashover. Due to the voltage angle （8） changes between the generator and power system, the flashover current varied in the circuit breaker fracture. In order to operate reliably for the flashover protection and circuit breaker failure protection, the current setting values of flashover protection and circuit breaker failure protection should be within a certain level. According to the practical recorder waveform of the fault, the principle of setting calculation for negative sequence current and zero-sequence current units of flashover protection and circuit breaker failure protection was analyzed, which provides a reference for engineers.

关 键 词：闪络保护 失灵保护 保护定值 

分 类 号：TM561[电气工程—电器]