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

A ground fault and analysis method technology, applied in the direction of fault location, measuring electricity, electrical components, etc., can solve the problem that the ground fault model cannot fully describe the characteristics of the ground fault, and achieve accurate response of zero-break characteristics, strong practicability, and high precision Effect

Active Publication Date: 2022-06-07
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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Embodiment Construction

[0037] To make the object, technical solution and advantages of the present invention more clearly understood, the following in conjunction with the embodiments and accompanying drawings, the present invention will be further elaborated in detail, schematic embodiments of the present invention and description thereof is for illustrative purposes only to explain the present invention, and is not intended as a limitation of the present invention.

[0038] Figure 1 Schematic diagram of the distribution network arc model applied to the present invention.

[0039] The basic working principle of the present embodiment is as follows:

[0040] According to the electric breakdown theory of short gap and the development process of ground fault, the fault branch is regarded as a series combination of breakdown gap arc and variable resistance generated by air breakdown, and the variable resistance value is affected by the dielectric density and temperature of the fault point.

[0041] The ch...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20H02H9/06H02H9/08G01R31/08G01R31/52G06F113/04
CPCG06F30/20G01R31/52G01R31/088H02H9/06H02H9/08G06F2113/04Y04S10/52
Inventor 李世龙龙呈高艺文苏学能杨勇波张华方玉范松海常政威
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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