小电阻接地系统接地故障反时限零序过电流保护

WANG Yang

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小电阻接地系统接地故障反时限零序过电流保护

更新时间：2025-08-13

- 小电阻接地系统接地故障反时限零序过电流保护
- Automation of Electric Power Systems Vol. 42, Issue 20, Pages: 150-157(2018)
- 作者机构：
  
  中国石油大学(华东)信息与控制工程学院,山东省,青岛市,266580
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2018
- 稿件说明：
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WANG Yang. [J]. Automation of electric power systems, 2018, 42(20): 150-157.
DOI：

WANG Yang. [J]. Automation of electric power systems, 2018, 42(20): 150-157. DOI：

摘要

现有的小电阻接地系统接地保护主要采用定时限零序过电流保护，定值较高，高阻接地时容易拒动。结合反时限过电流保护的特点，在分析小电阻接地配电网单相接地故障零序电流分布特征的基础上，提出一种改进的反时限零序过电流保护方法。通过各条出线保护间的横向配合，可使保护的启动电流定值无须躲过本线路的最大对地电容电流，显著降低了其启动门槛值，提高了高阻接地故障保护能力。通过MATLAB仿真验证了提出的反时限零序过电流保护的速动性和可靠性。

Abstract

The existing grounding protection for low resistance grounding system mainly adopts zero-sequence definite-time overcurrent protection

whose setting value is too high to act when high impedance grounding fault occurs. Considering the characteristics of inverse-time overcurrent protection

based on the analysis of the fault current distribution characteristics of single-phase grounding fault in low resistance grounding distribution network

an improved zero-sequence inverse-time overcurrent protection method is proposed. The starting current setting value of the protection doesn't need to escape from the maximum capacitance current of the outlet

with the crosswise coordination among each outlet

so that the starting threshold is greatly reduced

which can effectively improve the protection ability of the high impedance grounding fault. The speed and reliability of the proposed zero-sequence inverse-time overcurrent protection are verified by MATLAB simulations.

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