so it is necessary to find some ways for the fault location detection. in the phase-to-earth fault power system, the value of zero-sequence impedance is directly related to the earth conductivity.
这样就降低了供电可靠性,故找出一种新思路使其能更準确有效地判断故障点具有重要意义。
in the meanwhile it is pointed out that the quantity change of the parallel line and zero-sequence impedance must be retested.
同时还指出平行线路条数变化,零序阻抗均需重新测试。
the value and distribution of zero-sequence impedance in different areas and periods both are calculated in this paper based on the full-scale soil moisture data.
the paper aiming at the characteristic, introduces the methods of the winding ratio test and the zero-sequence impedance test of the type of z transformer.