变压器和应涌流分析

Analysis of inrush current of transformer

根据天堂抽水蓄能电厂3次典型的主变压器空投时高压侧电流录波波形，按不同的时间段分析了2台并联变压器励磁涌流和和应涌流的0～5次谐波，讨论了它们的特点和相互间的关系，分析了主变压器倒送电过流保护动作是因为和应涌流的存在，并对变压器保护出口方案进行相应的整改。

The analysis data on inrush current are drawn from the measured data in Tiantang Pumped Storage Power Plant （PSPP） ; According to the typical current oscillograms at high-tension side of the main transformer when it is switched in under no-load condition, the 0-5 order harmonic waves of excitation current and inrush current of two paralleled transformers are analyzed at different time intervals; the characters and relationship of them are discussed. The analysis comes to the conclusion that the action of overcurrent protection is caused by inrush current when the reverse current passes through the transformer; a relevant reform plan for the exit protection of the main transformer is put into practice.