According to the actual situation of powersupplynetwork and protection system under mine, a long distance faults online monitoring program is presented for overcoming the short protection distance.
Since more and more nonlinear equipments have been used in the powersupplynetwork, the generated high harmonics current leads to waveform distortion of voltage and current in the supply network.
The operation state of isolation monitor of loop powersupplynetwork is analyzed. Solutions have been proposed so as to assure safety and reliable operation of power system.