变压器新型励磁涌流识别元件  

A New Identification Component for Inrush Current of Power Transformer

作　　者：潘书燕[1] 郑玉平[1] 吴崇昊[1] 刘小宝[1] 侯喆[1] 龙锋[1] 

机构地区：[1]国电南瑞科技股份有限公司,江苏省南京市210061

出　　处：《电力系统自动化》2011年第19期63-67,共5页Automation of Electric Power Systems

摘　　要：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。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.

关 键 词：励磁涌流 识别元件 虚拟差流 波形综合分析 波形间断 

分 类 号：TM407[电气工程—电器]