变电站直流电源系统直流环网与交流窜入的原因及危害

Cause and harm of DC loop network and AC surge in DC power supply system of Substation

直流电源系统是电力二次系统的重要组成部分,安全可靠运行是继电保护及二次控置系统正确发挥作用的前提和基础,直流系统发生直流互窜、交流窜入故障可能损坏供电电源设备或直接导致保护控制设备误动,2014年12月河南电力检修公司洛阳分部济源500k V变电站直流系统故障排查中发现存在直流互窜和交流窜入故障,为了有效保证变电站、发电厂乃至整个电网的安全稳定运行,需要采取措施防止直流系统故障而带来的不利影响,因此需要对直流系统安装可靠稳定的微机绝缘装置来监测直流系统故障,以加快直流系统故障发现速度,提高系统的安全性,本文主要讲述变电站直流系统直流互窜及交流窜入故障的原因、危害分析。

DC Power Supply System is an important part of Secondary Power System,and its safe and credible operation is the base of Relay protection and Secondary Control System.The Intrusions from AC into DC or between ACs will cause the damages of the power supply equipments or the variations of control and protection devices.In December2014,the intrusions from AC into DC and between ACs arising in Jiyuan 500 KV transformer substation were found by Luoyang branch of Henan electric power Maintenance Engineering Co.,Ltd.when the troubleshooting of DC system were performed,and some measures should be taken to stop the negative effects from the fault of DC system,to ensure the transformer substation,power plant and overall power network can operate safety and stability,Therefore,the microprocessor insulation equipment was installed to supervising the fault of DC system,in order to find the fault promptly,and enhance the safety of system.The causes and damages of the intrusions from AC into DC or between ACs arising in DC system of transformer substation,are mainly analyzed in this paper.