Insulation fault detection circuit for ungrounded DC power supply systems
Insulation fault detection circuit for ungrounded DC power supply systems
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DOI：
10.1109/icsens.2012.6411550
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发表时间：
2012-10
期刊：
影响因子：
--
通讯作者：
Yow-Chyi Liu;Chen-You Lin
中科院分区：
文献类型：
--
作者：
Yow-Chyi Liu;Chen-You Lin
本文提出一种新型在线绝缘故障检测电路，以克服不接地直流供电系统无法提供高灵敏度漏电流检测的缺点。本文采用电容器组与正负母线连接，电容器组中间点接地，每个支路回路均安装漏电流检测装置。当系统出现绝缘故障时，电容器能够提供漏电流返回路径，并通过电容器中存储的能量进行放电。这将使霍尔效应电流传感器检测正负母线电流的差异，并发出警告信号或控制断路器切断电源。实验结果表明，该方法能够检测1mA/50kΩ的绝缘故障，达到高灵敏度的检测目标。
This paper proposes a novel online insulation fault detection circuit to overcome the shortcomings of ungrounded DC power supply system for being unable to provide high sensitivity leakage current detection. In this paper, the capacitor group is used to connect with positive and negative bus and ground the intermediate point of the capacitor group, and that each branch loop is installed with a leakage current detection device. When insulation fault occur in the system, the capacitor is able to provide a leakage current return path and discharge through the stored energy in the capacitor. This will allow the Hall effect current sensor to detect the difference of positive and negative bus current, and deliver warning signal or control the breaker to cut off the power supply. The experiment result demonstrates that this novel method is able to detect 1mA/50kΩ insulation fault to achieve the high sensitivity detection goal.