A Modeling and Analysis Method for Arcing Ground Fault in Distribution Network

Abstract

The present invention relates to the technical field of power system protection and fault detection, in particular to a method for modeling and analyzing arc-ground faults in distribution networks, which includes the following steps: Step 1. Establish a grounding variable resistance model of a fault branch, and the grounding can be The grounding variable resistance in the variable resistance model is the grounding resistance of the fault point on the fault branch; Step 2, establishes the short-gap breakdown arc model of the fault branch, and the short-gap breakdown arc model is the fault point on the fault branch The arc arc voltage; step 3, combining the grounding variable resistance model and the short gap breakdown arc model to establish a distribution network arc ground fault model based on the breakdown gap and variable resistance in different scenarios. The invention has the characteristics of obvious zero-break characteristic and accurate response to various types of grounding faults, provides sufficient theoretical support for the research and simulation of grounding faults in the subsequent lifting distribution network, and has strong practicability.

Description

Technical field [0001] The present invention relates to the field of power system protection and fault detection technology, specifically to a distribution network arc light grounding fault modeling and analysis method. Background [0002] Distribution network fault types are diverse, of which the probability of single-phase ground fault is large, the grounding point will flow through the short-circuit current when the ground fault occurs, the greater the current, the more severe the damage to the air medium, once the air is broken, an arc will be generated at the fault point, and because the fault current contains multi-band sine waves, the arc will continue to extinguish and rekindle. If the energy accumulated in this process is not effectively released, it will lead to continuous combustion of the arc, and when the cable line has arc ground fault, the non-fault phase overvoltage can be up to dozens of times the normal phase voltage, and eventually damage the line insulation, c...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a modeling and analysis method for arc-flash ground faults in distribution networks, which can comprehensively describe the characteristics of ground faults.

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