求翻译：电力系统长期运行的经验研究结果表明，系统电压下降主要由系统的无功功率不足或无功功率分布不合理。所以对于变电所来讲，为了使电压与无功达到所需的值，通常采用调整有载调压变压器的分接开关位置和控制无功补偿电容器来改变系统的电压和无功。分接头的变化和电容器组的投切不仅对电压有影响，而且对无功也有一定的影响。是什么意思？

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electric power system long-running Experience Study results showed that, the system voltage drop in the system, the lack of power or reactive power distribution is not reasonable. For the substation, in order to bring the voltage to the desired value, usually with adjustment with the regulating tran

The electrical power system long-term movement experience findings indicated that, the system voltage drops mainly distributes by the system reactive power insufficiency or the reactive power not reasonably.Therefore says regarding the transformer substation, in order to cause the voltage and the id

Power system operation experience research results show that the system voltage decreases by the irrational distribution of insufficient reactive power or reactive power. So for substation, in order to make the values of voltage and reactive power required to achieve, usually by adjusting the on-loa

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