为了解决二极管解耦方式向单电源负载供电易引起直流电源系统环路导致绝缘监测误告警的不足，对绝缘监测装置平衡与不平衡混合式监测原理进行分析与研究，综述了电源母线及馈电回路监测原理，找出绝缘监测回路误告警原因，并推导出对地电阻计算公式。针对这种单电源负载，提出安全性能更高的直流电源系统改进措施，有效地减少直流电源系统故障引起的直流工程故障停运。%Because diode decoupling method of DC power supply to the single power load is easily lead to error alarm of insulation monitoring device, balanced and unbalanced hybrid detection principle of the insulation monitoring device are analyzed and researched, then summarized detection principles for power bus and feed loops, and derived the calculating formula of resistance. It found out the cause of insulation detecting device’s error alarm when it was used in diode loop decoupling method, then put forward the DC power supply system with higher safety performance improvement measures. Outage of these improvement measures effectively decrease caused by DC power system fault.
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