In order to provide a technical basis for circuit service without total outage of the 500 kV transmission line of four circuits on one lower, 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 resull 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 operatinn can be live working, or power-off working with safety protective measures.%为了给500 kV同塔四回线路不全停运时的检修作业提供技术依据,通过仿真计算的方法,分别计算了 500 kV同塔四回线路,在两回运行两回停运、三回运行一回停运的情况下,在停运回路上的感应电压情况.计算结果发现,在500 kV同塔四回线路不全停运时,在停运线路两端均不接地的情况下,停运线路上的感应电压峰值最大可达105kV;在停运线路两端均接地的情况下,停运线路上的感应电压峰值最大可达95 V.根据计算及分析结果,提出了 500 kV同塔四回线路不全停运时的检修作业可采用带电作业方式或停电作业方式并需采取相应的安全防护措施.
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