检测桥电阻对直流电源系统安全运行的影响分析

摘要

It can improve the reliability of the auxiliary power system for substations by using two independent DC power sys-tems.However, some factors in the actual operation will make the two DC buses occur DC crosstalk.The monitoring ability of the grounding fault is improved by microcomputer insulation monitor, and the DC crosstalk is also detected by the device.The selection criteria of the detecting bridge resistor for microcomputer insulation monitor are discussed.Meanwhile, a simulation analysis on the influence of detecting bridge resistor on the safe operation of DC power system is carried out during DC crosstalk, which provides a reference for the selection of detecting bridge resistor.%变电站采用两套独立运行的直流电源系统，提高了站用电系统的可靠性，但实际运行中一些不当因素会使两段直流母线发生互串。微机型绝缘监测装置不仅提高了接地故障的监测能力，而且还能进行直流互串检测。探讨了微机型绝缘监测装置的检测桥电阻值选取，同时还对直流互串时检测桥电阻对直流电源系统运行状态的影响作了仿真分析，为检测桥电阻的选择提供了参考。