关键词: 500 kV, 同塔四回线路, 不全停运, 感应电压, 检修作业

Abstract: In order to provide a technical basis for circuit service without total outage of the 500 kV transmission line of four circuits on one tower, the induced voltage of outage circuits were calculated by simulation under the condition of two circuits operating while the other two outage, or three circuits operating while the other one outage. The calculation result indicates that when the two ends of outage circuits is ungrounded, the max peak value of the induced voltage of outage circuits can reach as high as 105 kV; when the two ends of outage circuits is grounded, the max peak value of the induced voltage of outage circuits can also reach as high as 95 V. It is proposed that, when the 500 kV four circuits on one tower is incomplete outage, the service operation can be live working, or power-off working with safety protective measures.

Key words: 500 kV, four circuits on one tower, incomplete outage, induced voltage, service operation