电力变压器局部放电超高频电磁波产生机理及传输特性研究

Study on Generation Mechanism and Transmission Characteristics of UHF Electromagnetic Wave in Partial Discharge of Power Transformer

对变压器油-纸板复合绝缘中由局部放电引起的超高频电磁波的传输特性进行了分析,并对电磁波传输的影响因素进行了讨论。研究结果显示:在变压器的油-隔板复合绝缘中,局部放电导致的超高频电磁波在传输时存在衰减,但不会对电磁波的接收产生较大影响。此外,电磁波会因变压器的箱体而发生严重衰减,造成检测灵敏度受到很大程度上的影响,所以在实际测量时应将超高频传感器安装在变压器箱体内部。

In this paper,the transmission characteristics of UHF electromagnetic wave caused by partial discharge in transformer oil partition composite insulation were analyzed,and the influencing factors of electromagnetic wave transmission were discussed.The results showed that:in the oil partition composite insulation of transformer,the transmission of UHF electromagnetic wave caused by partial discharge had attenuation,but it won′t not have a great impact on the reception of electromagnetic wave.In addition,the electromagnetic wave would be seriously attenuated due to the transformer box,so the sensitivity of detection would be greatly affected.Therefore,the UHF sensor should be installed in the transformer box in the actual measurement.