描述
在10kV中性点不接地系统中，为了监视系统中各相对地的绝缘状况以及计量和保护的需要，在每个变电站的母线上均装有电磁式电压互感器。当系统发生单相接地故障时，将产生较高的谐振过电压，影响系统设备的绝缘性能和使用寿命，进而出现更频繁的故障。
在中性点不接地系统中，当其中一相出现金属性接地时，就会产生激磁涌流，导致电压互感器铁芯饱和。如A相接地，则Uan的电压为零，非接地相Ubn、Ucn的电压表指示为100V线电压。电压互感器开口三角两端出现约100V电压(正常时只有约3V)，这个电压将起动绝缘检查继电器发出接地信号并报警。当发生非金属性短路接地时，即高电阻、电弧、树竹等单相接地。如A相发生接地，则Uan的电压低于正常相电压，Ubn、Ucn电压则大于58V，且小于100V，电压互感器开口三角处两端有约70V电压，达到绝缘检查继电器起动值，发出接地信号并报警。电压互感器二次侧熔断器熔断或接触不良时，中央信号屏发出“电压回路断线”的预告信号，同时光字牌亮，警铃响。查电压表可发现：未熔断相电压表指示不变，熔断相的电压表指示降低或为零。遇到这种情况，可检查电压互感器二次回路接头(端子排)处有无松动、断头、电压切换回路有无接触不良等现象和电压互感器二次熔断器是否完好，找到松动、断线处应立即处理;若更换熔断器后再次熔断，应查明原因，不可随意将其熔丝增大。 电压互感器当线路带电设备上某点发生金属接地时，接地相电压为零，而正常相的对地电压值升高到原来的√3倍，产生严重的中性点位移。电压互感器中性点位移电压与接地相电压大小相等，方向相反。如果把线路断开后，接地仍未消除，则考虑是否与变电站内设备有关，如变压器、电压互感器、避雷器、断路器等接地。
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