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10KV单项（俩相接地属于短路，早跳闸了）接地相对比较常见，接地故障原因很多。如果是初学变电站运行者，应该补充学习电工基础知识，至少要知道（短路 断路 通路）还有（电压 电流 电阻）的关系等。
高压线一般就三条线，（ABC）三相对地一般是绝缘的 （大地也是导电的）只要有其中任意一相接触了大地就称单项接地了。它并不影响短期运行，只是一些绝缘体受到一定的考验。就是说10KV系统所有的绝缘体（支持导线的瓷瓶，避雷器，线圈等）由原来承受的6KV相电压变为10KV线电压，这样时间长了很容易使绝缘体击穿损坏（考虑到设备的经济，设备的灵巧等，绝缘体不能够做很大）。所有一般规定在2小时内处理接地事故。
这里需要说明电压互感器的作用：显示电源线电压和相电压，相电压尤其检测10KV系统接地情况 。线电压用于计量和保护方面。
电压互感器一次侧和二次侧分别装设熔断器和空气开关 作为本体保护（电压互感器不能短路）。所以熔断器有时候熔断后一相电压很低，其他俩相正常。（熔断器一般在PT一次侧安装）无论是接地或者断线都要去观察相电压的值。我们要经常去现场观察设备各个部分的构造及工作原理，同时要看懂二次设备图纸，变电站的图纸有几个去翻？只有上级***和站长检修人员去翻或者技术员工程师去翻。规程规定值班人应该读懂图纸，懂了图纸才能知道设备原理，知道了设备原理才能处理事故，如果不知道设备工作原理，怎么能够判断处理事故？
变电站10KV接地系统接地原因也多了。常见电缆故障***多，其次瓷瓶击穿。避雷器击穿，导线落地， 雷击可能造成瞬间接地或者***性接地。
接地的处理一般拉路或者根据***的设备显示故障线路断开故障线路，PT断线应该由检修人员处理》
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