Automatic processing method and processing system for single-phase grounding faults

Abstract

The invention discloses an automatic processing method and processing system for single-phase grounding faults. A faulty phase grounding arc extinguishing device is arranged on the bus of a power station, and terminals integrated with a faulty phase grounding incremental principle and a faulty phase grounding disconnection incremental principle are arranged along a distribution line. When single-phase grounding occurs in the distribution line, the terminals use the disturbance information caused by the action process of the faulty phase grounding arc extinguishing device to realize the sectional positioning alarm of instantaneous single-phase grounding faults and the local tripping isolation of permanent single-phase grounding faults. Furthermore, by combining the function of delayed closing after voltage loss on the configuration side of an interconnection switch with the delay of the protection action of the faulty phase grounding disconnection incremental principle in the terminalsalong the distribution line, the power supply in a sound section in the downstream of a permanent single-phase grounding fault section is restored by adopting two sets of fixed values according to different power flow directions.

Description

technical field [0001] The invention relates to distribution automation technology and distribution network single-phase ground fault detection technology, in particular to a single-phase ground fault automatic processing method and processing system. Background technique [0002] Single-phase grounding is the most common fault in distribution network, but because the neutral point is not effectively grounded, the current characteristics of single-phase grounding fault are not as obvious as phase-to-phase short circuit, and the selection, location and protection of single-phase grounding encounter great difficulties. Many research results have been achieved in this area, mainly including steady-state measurement method, transient measurement method and injection method. Many theories work well in the simulation and laboratory testing stage, but the effect in practical application is not satisfactory. Among them The main reason is that in the non-effective grounding mode of t...

AI Technical Summary

Problems solved by technology

[0002] Single-phase grounding is the most common fault in distribution network, but because the neutral point is not effectively grounded, the current characteristics of single-phase grounding fault are not as obvious as phase-to-phase short circuit, and single-phase grounding encounters great difficulties in line selection, location and protection

Many research results have been achieved in this area, mainly including steady-state measurement method, transient measurement method and injection method. Many theories work well in the simulation and laboratory testing stage, but the effect in practical application is not satisfactory. Among them The main reason is that in the non-effective grounding mode of the neutral point, the fault current characteristics are weak, the detection is difficult, and it is easily disturbed by unstable fault arcs and random factors. Only the electrical quantity after single-phase grounding is collected from the secondary side. It is difficult to satisfactorily solve the problem of line selection and location of single-phase ground fault in distribution network

Images