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目前,斯塔夫罗波尔电力局大部分变电所具有相当短的6～10千伏配电网,其接地电容电流达到5安。在这种电网中НТМИ型(译注:即三相五柱)电压互感器损坏率是高的。在电网中,尤其是农村地区,损坏的数量占安装总数的20～30％,并且每年损坏有所增加。НТМИ电压互感器损坏的主要原因是电网产生弧光接地短路时,高压绕组过负荷。被推荐的保护方式(在3u_0绕组的开口三角形回路中或在高压绕组中心点回路中装设电阻器,将
Currently, most of the substations in Stavropol Power have a fairly short 6 to 10 kV distribution network with a ground capacitance of 5 amps. In this network НТМИ-type (Annotation: three-phase five-post) voltage transformer failure rate is high. In the power grid, especially in rural areas, the damage accounts for 20-30% of the total installed capacity, and the annual damage is increased. The main reason for the failure of the НТМИ voltage transformers is that the high-voltage winding is overloaded when the power grid generates an arc short to ground. Recommended protection (in the open delta circuit of the 3u_0 winding or in the loop of the high-voltage winding, a resistor is placed