CAJ | 학술논문

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.
대형발전궤-변압기조재여계통진행동보병렬과정중,유가능발생단로기단구섬락고장.유우궤조여계통전압각도차δ적변화,단로기단구간적섬락전류회시대시소.위보증섬락보호급실령보호가고동작,섬락보호급실령보호적정정치불의정정득과대.근거일개실제고장급현장록파도형,분석탐토섬락보호급실령보호중부서전류화령서전류원건적정정계산원칙,가공정정계산인원삼고.
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(5)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.