变电站直流电源系统环网故障分析

Ring Network Fault Analysis of DC Power Source System in Substations

随着对电网安全要求越来越高,因直流环网引起的继电保护装置拒动和误动案例也越来越多。介绍了直流环网类型及原因,并讨论了不同直流环网类型对直流电源影响表征现象和影响程度,发现按直流环网对直流系统的影响程度和紧急情况而言,两极异极环网最为严重,单极异极环网次之,同极环网影响程度最小,为现场检修人员提供了判断依据,缩短了故障查找和处理时限。

As the requirements of power grid security become higher,more and more cases of refuse operation and false action of relay protection devices caused by DC ring network appear.The paper introduces the types and causes of DC ring network and discusses the ef-fects of different types of DC ring network on DC power source characterization and influence degree.From the perspective of the influence degree of DC ring network on DC system and emergency situation,bipolar heteropolar ring network is the most serious,unipolar heteropolar ring network is the second,and homopolar ring network has the least influence degree.Therefore,the above conclusion can provide judgment basis for on-site maintenance personnel and shorten the time of fault search and treatment.