The Research On Fault Selection Technology Of Oilfield Distribution Network

Non-effectively ground system was adopted in Daqing oilfield distribution network and the single-phase ground faults happened frequently because of the over loading, long-distance lines and more branchs. Especiallly, as the increase of the oilfield users and the capacity of electrical equipment, as well as more cables were used, it's not solved for a long time that the single-phase ground fault selection and fault location problems. This paper foucesd on the fault selection & location technology in arc-suppression coil grounding distribution system.According to the actual situation, the selection method of paralleled medium resistance while petersen coil occurs short-circuit fault is presented in this paper. In order to greatly enhance the zero-sequence current active component during the single-phase ground fault, the short-time switch and the resistance paralleled with the petersen coil were controlled when there is a permanent single-phase ground fault in the system. The zero-sequence current generated by the parallel resistance and zero-sequence active power is much greater than the non-fault line. Thus, thanks to zero-sequence active power, the selection accuracy can be improved significantly.This paper analyzed the injection sigal method and presented that the single-phase ground fault location method, which is based on the injection singal method, and which is the best method now. The paper also described the network topology, which proved that the information table and discernibility matrix have nothing to do with the branch fault, but can accurately determine the fault location. Finally, the paper introduced a small-current ground selection device, and analyzed its working principle and implementation functation.