摘要：变电站是电力系统中转换电压、接受和分配电能、控制电流走向和调整电压的电力设施。

Abstract: : the substation is in power system voltage conversion, accept and electric power distribution, control and adjustment to the current voltage power facilities.

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摘要城市配电网的规模巨大，因此配电网无功补偿对降损节能，改善电压质量意义重大。

Urban distribution scale bigness so compensation of reactive power in urban distribution is very important for detract consume economy energy sources ameliorate voltage quality.

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配电系统电压跌落问题的分析。

Analysis of voltage sags in distribution system.

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