Study on Single-phase Ground Fault Diagnosis Based on Three Phase Current Variation Increment

LI Zhiling; XU Su; ZHENG Yan; LI Zhibo; ZHANG Ruiqiang; LI Hang; SUN Jianing

doi:10.13296/j.1001-1609.hva.2026.08.024

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Study on Single-phase Ground Fault Diagnosis Based on Three Phase Current Variation Increment

Research & Analysis | 更新时间：2026-08-12

- Study on Single-phase Ground Fault Diagnosis Based on Three Phase Current Variation Increment
- High Voltage Apparatus Vol. 62, Issue 8, Pages: 203-213(2026)
- 作者机构：
  
  内蒙古电力（集团）有限责任公司包头供电分公司，内蒙古包头 014030
  广州市宁志电力科技有限公司，广州 511400
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.08.024
  CLC：
- Received：17 January 2026，
  
  Revised：2026-03-19，
  
  Published：16 August 2026
- 稿件说明：
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LI Zhiling, XU Su, ZHENG Yan, et al. Study on Single-phase Ground Fault Diagnosis Based on Three Phase Current Variation Increment[J]. High Voltage Apparatus, 2026, 62(8): 203-213.
DOI：

LI Zhiling, XU Su, ZHENG Yan, et al. Study on Single-phase Ground Fault Diagnosis Based on Three Phase Current Variation Increment[J]. High Voltage Apparatus, 2026, 62(8): 203-213. DOI： 10.13296/j.1001-1609.hva.2026.08.024.

摘要

为了解决单相接地故障处理存在高阻故障判断盲区的技术难题，对接地故障发生时三相电流变化增量进行研究。从理论分析和10 kV真型模拟试验两方面入手，分析单相接地故障网络，研究接地故障点前后三相电流变化增量的特征，结合10 kV真型模拟试验数据、提出完整判据，创新了一种采用三相电流的稳态变化量来判断单相接地故障方法。该方法通过多种类型10 kV真型单相接地故障试验，证明其能够对单相接地故障准确选相选线和故障定段，并具有精准判断高阻接地故障的技术优势，可普遍适用于中性点不接地、经消弧线圈和小电阻接地系统。

Abstract

In order to address the technical challenge of blind spots in high-impedance fault ientification during single-phase ground fault handling

the incremental changes in three-phase currents upon the occurrence of ground fault are investigated. Through both theoretical analysis and 10 kV full-scale simulation tests

the single-phase ground fault network is analyzed

and the characteristics of the three-phase current variation increments before and after the ground point are studied. A complete criterion is proposed in combination with the data from the 10 kV full-scale simualtion tests

and an innovate method for identifying single-phase groud faults using steady-state variations of three-phase current is developed.This method has been validated through various types of 10 kV full-scale single-phase ground fault tests

demonstrating its capability to accurately determine the faulted phase

identify the faulted feeder

and locate the fault section.Moreover

it also exhibits a distinct technical advantage in accurately identifying high-impedance ground fault. Furthermore

this method is universially applicable to neutral point ungrounded systems

systems grounded via arc-suppression coil

and low resistance grounded systems.

关键词

Keywords

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