文档介绍：第 25 卷第 9 期电子测量与仪器学报 Vol. 25 No. 9
2011 年 9 月 JOURNAL OF ELECTRONIC MEASUREMENT AND INSTRUMENT · 793 ·
DOI: .
多直流支路接地检测方法的研究
黄海宏陈伟王海欣
(合肥工业大学, 合肥 230009)
摘要: 绝缘监察装置是变电站和发电厂用直流操作电源系统必备的检测装置。本文对传统的绝缘监测方法的原理进行了
分析, 并指出其存在的问题。在此基础上, 对差流检测法的基本原理进行分析, 其采用对正负母线绝缘检测电阻的定时切换, 形
成不平衡桥, 可检测出正负母线对地绝缘电阻; 与直流漏电传感器相结合, 可实现直流馈出支路绝缘故障的极性和阻值检测。本
文详细推导了不引入不平衡桥与引入平衡桥相结合的方法, 可有效解决目前基于不平衡桥的差流检测法难以正确测量多支路正
负同时接地故障的问题, 并通过实验证明其可行性。
关键词: 直流电源系统; 绝缘监察; 不平衡桥; 差流检测法; 多支路接地
中图分类号: TM855 文献标识码: A 国家标准学科分类代码:
Study of detecting method for several branchs grounding
Huang Haihong Chen Wei Wang Haixin
(Hefei University of Technology, Hefei 230009, China)
Abstract: Insulation monitoring device is necessary detecting device of DC operation power supply system in sub-
stations and power plants. The principle of conventional insulation supervision and measurement was analyzed, and the
existing problems were discussed. Based on these analyses, the principle of differential current method was analyzed. The
unbalanced bridge is formed by switching insulation detecting resistances to positive bus and negative bus, so the ground-
ing resistances to positive bus and negative bus can be detected. Based on unbalanced bridge, the polarity and value of
grounding resistances can be detected by using leak current sensors. The troublesome pr