A single-phase ground fault automatic processing method and processing system

Abstract

The invention discloses a single-phase grounding fault automatic processing method and processing system. The faulty phase-grounding type arc extinguishing device configured on the busbar of the power station and the internally integrated faulty phase-to-grounding incremental principle and fault The terminal based on the phase-to-ground disconnection incremental principle, when a single-phase ground occurs on the distribution line, the terminal uses the disturbance information caused by the action process of the faulty phase-to-ground type arc extinguishing device to realize the section positioning alarm of the instantaneous single-phase to ground fault It is isolated from the nearest tripping of permanent single-phase grounding faults, and further combined with the delay closing function after the loss of voltage on one side of the contact switch configuration, and cooperates with the terminal fault phase grounding disconnection of the terminal along the distribution line. The protection action delay time Two sets of fixed values ​​according to different tidal current directions are adopted to realize the restoration of power supply in the healthy section downstream of the permanent single-phase ground fault section.

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...

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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

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