QIAN Jia-li1, GUAN Yong-gan1, XU Guo-zheng1, et al. Simulation and Analysis on Error of Protective Type CT due to Residual Magnetism[J]. High voltageapparatus, 2005, (1): 26-28.
QIAN Jia-li1, GUAN Yong-gan1, XU Guo-zheng1, et al. Simulation and Analysis on Error of Protective Type CT due to Residual Magnetism[J]. High voltageapparatus, 2005, (1): 26-28.DOI:
It is found that there are serious distortion and big error and schattering seriously in three-phase short circuit current measurement with electro-magnetic 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.