500kV内桥接线变电站停电安全浅析

摘要:

500 kV 变电站采用内桥接线方式具有占地少、易操作等特点，特别针对两条出线、3 台开关的情况。其优点在 于线路的停、送电操作比较方便，发生故障时也不会影响其他回路的正常运行，但此时主变压器发生故障或误操作所 造成的安全风险因素则相对要高得多，这就对变电站运行维护及倒闸操作的安全可靠性提出了更高的要求。以四川 首座 500 kV 内桥接线变电站为例，详细介绍了其停送电的危险点和不同的操作方案，并对各方案进行了风险对比，其 目的在于为运行人员的停送电操作提供决策，进而提高变电站内的安全操作水平。

Abstract:

The inner bridge connection in 500 kV substation has the features of small footprint and easy operation，especially for two outlets and three switches，which is more convenient for power supply interruption and power transmission and will not affect the normal operation of other lines． However，it will increase relatively higher safety risk factors when the main transformer fails or malfunction happens，so the safety and reliability of operation maintenance and switching operation in substation need higher requirements． Taking the first 500 kV substation with inner bridge connection in Sichuan for example，the relative dangerous points in power supply interruption and power transmission and the different operating programs are introduced in detail，and the risks in each program are compared，which aims to provide the decision － making for operating staff in power supply interruption and power transmission so as to increase the level of safe operation in substation．