两组直流系统同时异常的影响试验及分析

Influence Test and Analyzing of Two Sets of DC Systems in Abnormal Situation Simultaneously

目前变电站普遍采用两组独立直流系统的方式设计与运行,当两组直流系统同时出现接地也可能造成断路器跳闸。通过现场模拟试验和记录,结合现场环境参数深入分析不同直流系统同时接地或两组直流之间出现混接等异常对运行设备带来的潜在危害,提出了对实际工作有指导意义的建议。

Two separated DC systems are usually designed and operated in substation at present,when the two DC systems occur grounding faults at the same time,breaker trip may happen.Through on-site simulation test and record,as well as on-site surrounding parameters,and with deepening analysis of those abnormal influences such as different DC systems grounding simultaneously or mixing connection between two systems etc,which may bring potential damage to the equipments in operation,the paper raises some guide suggestions to the practical work.