基于直流漏电流检测原理的直流电路接地选线系统

A DC Grounding Line Selection System Based on DC Leakage Current Detecting Principle

针对直流系统接地故障不能及时排除,会造成直流电源短路或保护设备误动,引起严重后果的问题,采用基于直流漏电流检测原理,并利用微机系统实现信息的采集和处理的接地故障选线方法,分析基于不平衡电桥的直流母线绝缘监测,基于直流电流传感器的支路电流巡检原理及基于微机控制的数据采集系统。结果表明:该方法抗干扰能力强、工作稳定、选线准确,是实现直流系统接地检测的理想选线方法。

The DC system ground fault is a common trouble short -circuit or protection device malfunction and probab , which, if not obviated in time, will result in DC power ly cause serious consequences. To cope with this prob- lem, this paper proposes a fault line selection method based on DC leakage current detection principle and using the computer system to achieve the information collection and processing. The DC bus insulation monitoring based on unbalanced bridge, the branching current inspection principle based on DC current sensor and the data acquisition system based on microcomputer control are analyzed. The results show that the proposed method has good anti - in- terference ability, stable in operation and accurate in line selection, and is an ideal line selection method for DC system ground fault detection.