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变压器中性点接地电阻柜有什么作用
发布人:管理员   发布时间:2025-6-25
变压器中性点接地电阻柜有什么作用?变压器中性点接地电阻柜是使用在中性点不接地的供电系统中的,在我国一般都是使用在6KV和10KV系统中。
在上述电压的供电系统中,存在着三相火线对地的电容电流,三相线路中的一相接地,将会有电容和电流流过短路点,当这个电流较小的时候,对于供电系统一般不会造成很大破坏,允许带故障并运行一段时间后,用以保证供电的可靠性。但是供电系统很大的时候,电容电流也比较大的时候,当发生单相对地的短路时,就会由于中心点电压偏移等诸多的原因,从而造成系统过电压。所以在变压器中性点接上电阻柜后,可以强制的固定中性点的电压,同时由于电阻对于过电压的阻尼作用,可以大幅度的降低故障过电压的水平。所以,当供电系统的电容电流大于10A的时候,就应当考虑设置中性点接地电阻柜了。
电阻柜内只含有一个电阻,有的或者还会有一个供切断电阻的隔离开关。直接接到变压器的中性点上。
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