摘要
通过场路耦合的方法计算了变压器匝间短路、饼间短路等线圈各种假设短路故障工况,获得故障状态下的线端短路稳态电流和阻抗参数,再根据计算得到的系统参数和故障时刻初相角,通过数学模型模拟出短路发生后的故障瞬态波形,若与实际故障录波对比可以推断短路故障的起因。通过对某台大型单相电力变压器验算,证明了该系统故障由非线圈短路引起。
The inter-turn short circuit, the inter-segment short circuit and various hypothetic coil short-circuit faults of transformers are calculated with field-circuit coupling method. Then the steady short circuit current on the line end and the impedance in the fault state can be obtained. According to the calculated system parameters and the initial phase angle in the fault time, the fault transient waveform can be simulated with math method. It can be used to infer the reason of short current fault by comparing this waveform with the one in the fault recorder. It is proved that the system fault is not caused by the coil short-circuit fault by applying the proposed method to large single-phase power transformer.
出处
《电工技术学报》
EI
CSCD
北大核心
2015年第20期65-70,共6页
Transactions of China Electrotechnical Society
关键词
变压器
短路
故障
场路耦合
有限元
Transformer, short circuit, stray loss, field-circuit coupling, finite element method
