直流母线接地绝缘检测方法研究

Monitoring Method for DC Bus Grounding Insulation

直流电源作为二次控制回路和继电保护装置的供电系统,其故障可能引起一次系统的误动作,从而导致重大电力事故的发生。分析了现有的直流母线绝缘监测方法的优点和缺点,基于不平衡电桥原理设计了一种直流母线绝缘综合监测方法,以避免传统方法带来的监测死区,准确检测出了直流母线故障点位置。

As the power supply system of the secondary control loop and relay protection device,the insulation fault of DC power supply may cause a malfunction of the primary system and lead to the occurrence of a major power accident.This paper analyzes the advantages and disadvantages of the existing DC insulation monitoring methods,and designs a new DC bus insulation monitoring method based on the unbalanced bridge principle.The system can effectively avoid the monitoring of dead zone caused by the traditional method,and accurately detect the fault point position of DC bus.