Voltage sags due to line faults, transformer energizing and induction motor starting are main interference sources.
输配电线路故障、变压器投运、感应电动机启动是引起电压凹陷的主要原因。
Wherefore, it is very important of the appropriate starting mode to decrease the transformer capacity and ensure the security of starting.
因此，选择合理的启动方式，对减小变压器容量及启动的安全性尤为重要。
It can be combined with a set of transformer main protection by combining negative-phase sequence current sudden-change starting element.
它也可与负序电流突变量起动元件配合，构成一套变压器主保护。
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