摘要
在现场的电磁式电流互感器,所测得的三相短路电流波形会出现非常严重的畸变,误差也极大,且分散性很大,与因铁心饱和造成的波形畸变又不相同。利用电磁暂态程序EMTP进行机理分析的结果认为:短路电流起始相位的随机性以及互感器铁心剩磁方向的随机性会导致上述现象的出现。
It is found that there are serious distortion and big error and scattering seriously in three-phase short circuit current measurement with electromagnetic CT in field test, and the waveform is different from that due to magnetic saturation. With simulation by EMTP, it shows that both the random initial phase of short circuit current and the random direction and value of residual magnetism are the reason of above mentioned phenomenon.
出处
《高压电器》
EI
CAS
CSCD
北大核心
2005年第1期26-28,共3页
High Voltage Apparatus
关键词
电磁式电流互感器
保护型电流互感器
剩磁
误差
仿真
electro-magnetic current transformer
protective type CT
residual magnetism
error
simulation
