空投对电力变压器励磁涌流的影响

Influence of Airdrop on Inrush Current of Power Transformer

电力变压器在电力行业中占据着极其突出的地位,在稳定运行状态下产生的感应涌流较少,但是当电力变压器处于无负载状态时,进行合闸操作时,会出现大于额定电流数倍的励磁涌流。以变压器产生的涌流为研究对象,结合PSCAD4.2模拟软件,通过模型建立、工况模拟、波形图示来分析变压器空载合闸运行实况,针对此实况引入变压器“或门闭锁”保护原理,并最终通过实验校验保护的正确性。

The power transformer occupies an extremely prominent position in the power industry,and the induced inrush current is relatively small under the stable operation state,but when the power transformer is in the no-load state,the inrush current which is several times larger than the rated current will appear during the closing operation.Taking the inrush current generated by transformer as the research object,combined with pscad4.2 simulation software,through model establishment,working condition simulation and waveform diagram to analyze the actual situation of no-load closing operation of transformer,the principle of transformer“or gate locking”protection is introduced for this situation,and the correctness of protection is verified through experiments.