CAJ | 학술논문

基于专门用于励磁涌流识别的虚拟差流，利用励磁涌流波形谐波、间断、励磁涌流的尖顶波和波形上升、下降处边沿斜率大的特征，通过综合波形谐波、波形间断判据实现按相制动。仿真、试验、现场录波回放和现场运行验证了采用按相制动的新型励磁涌流识别元件能够准确区分励磁涌流和故障电流，保证空投时的可靠闭锁及空投于故障的快速动作。
기우전문용우려자용류식별적허의차류，이용려자용류파형해파、간단、려자용류적첨정파화파형상승、하강처변연사솔대적특정，통과종합파형해파、파형간단판거실현안상제동。방진、시험、현장록파회방화현장운행험증료채용안상제동적신형려자용류식별원건능구준학구분려자용류화고장전류，보증공투시적가고폐쇄급공투우고장적쾌속동작。
A new method for distinguishing inrush current from the fault current of transformer is discussed. The method is based on the virtual differential current with characteristics such as： waveform harmonics, waveform discontinuous, wave spire and high slope of rising and back edge of waveform. Integrating waveform harmonics criterion with discontinuous waveform criterion, inrush current braked is implemented with phase. The correctness and effectiveness of the method are proved by the simulation, experiment, playback of field recording data and long-standing field running. The algorithm proposed can ensure the protection device locking reliably when transformers are energized, while acting quickly when transformers are energized accompanied with fault.