Calculation and analysis of induced current of open circuit breaker in 500 kV substation

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Aug.2024, Vol.47 No.8: 1056-1061

DOI: 10.3969/j.issn.1003-5060.2024.08.008

Authors

YAN Song $ ^{1} $, ZHANG Xiaoming $ ^{1} $, MA Kai $ ^{1} $, HUANG Daojun $ ^{1} $, SU Yang $ ^{2} $, LIU Gang $ ^{2} $

(1. Maintenance Branch, State Grid Anhui Electric Power Co., Ltd., Hefei 230041, China; 2. School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: The induced current will be generated in the circuit formed by the open circuit breaker and the ground wire. In this paper, the induced current of the circuit breaker, cable, ground grid and the fluid circuit composed of two ground wires and ground cutters in the 500 kV switching field of the substation is measured firstly. Then, the power frequency magnetic field of the 500 kV switching field of the substation is simulated respectively in the normal working state and during maintenance. The results show that the peak-to-peak value of the induced current generated by the fluid circuit of the circuit breaker in the 500 kV switching field is in the range of 3.85-7.33 A under maintenance condition. In normal working state, the magnetic induction intensity of the switching field ranges from 0.260 $ \mu $T to 7.480 $ \mu $T, and the maximum value of the power frequency magnetic field intensity is mainly distributed at the intersections of wires. The magnetic induction intensity of the switching field ranges from 0.440 $ \mu $T to 8.760 $ \mu $T under maintenance condition, and the higher value of power frequency magnetic field intensity is mainly distributed below the second bus. The research results can provide reference for the safety operation of overhaulers of open circuit breakers.

Keywords: 500 kV substation; open circuit breaker; power frequency magnetic field; induced current; simulation analysis

作者信息

晏松 $ ^{1} $，张晓明 $ ^{1} $，马凯 $ ^{1} $，黄道均 $ ^{1} $，苏洋 $ ^{2} $，刘岗 $ ^{2} $

(1. 国网安徽省电力有限公司检修分公司, 安徽合肥 230041; 2. 合肥工业大学电气与自动化工程学院, 安徽合肥 230009)

摘要和关键词

摘要: 为分析断路器与地线形成的回路中产生感应电流的特性,文章对处于变电站500 kV开关场内的断路器、导线、地网和2个接地线与接地刀闸组成的通流体回路中的感应电流进行测量,并分别对变电站500 kV开关场正常工作状态下和检修状态下的工频磁场进行仿真。研究结果表明:在检修状态下500 kV开关场内断路器通流体回路产生的感应电流峰峰值在3.85~7.33 A之间;正常工作状态下开关场磁感应强度范围在0.260~7.480 $ \mu $T之间,工频磁场强度最大值主要集中分布在导线交叉处;检修状态下开关场磁感应强度范围在0.440~8.760 $ \mu $T之间,工频磁场强度较大值主要集中分布在第2回母线下方。研究结果为敞开式断路器检修人员安全作业提供参考。

关键词: 500 kV 变电站；敞开式断路器；工频磁场；感应电流；仿真分析

Funding

国网安徽省电力有限公司科技资助项目（521203200002）

合肥工业大学学报(自然科学版)

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