不同沖擊電壓下變壓器油擊穿特性研究

李秀廣 李軍浩 吳旭濤 靳宇輝

摘 要：為了研究大型電力變壓器絕緣油在振蕩型沖擊電壓下極不均勻電場擊穿特性，依據IEC60060-3標準搭建了能產生不同類型沖擊電壓波形的試驗及其測量系統，在實驗室利用該系統開展了振蕩型沖擊電壓下油中極不均勻場的時域擊穿和伏秒特性研究，并對實驗模型電場進行了仿真分析。在實驗過程中利用13.7 kHz振蕩操作波、標準雷電波、3種不同頻率的振蕩雷電波，研究了變壓器油在各個波形下的時域擊穿圖形及伏秒特性，對實驗波形的計算結果表明：振蕩型雷電波下的擊穿點分布較廣，振蕩波的擊穿電壓整體高于標準雷電，但是它們的最高耐受電壓與標準雷電下的基本一致。

關鍵詞：振蕩型沖擊 ；絕緣油；極不均勻；電場；仿真；擊穿特性

DOI：10.15938/j.emc.（編輯填寫）

中圖分類號：TM 8 文獻標志碼：A 文章編號：1007 -449X（2018）00-0000-00

Abstract：In order to study the large power transformer insulating oil in oscillation under impulse voltage breakdown characteristics of nonuniform electric field， based on the IEC60060-3 standard to build a system， the system produces different types of impulse voltage waveform test and measurement system in the laboratory using the system， to carry out the research on the oscillatory impulse voltage in oil under extremely uniform field time breakdown and V-s characteristics， and the experimental model of the electric field are analyzed. The use of 13.7kHz oscillation wave， standard lightning wave， three different frequency oscillations of the lightning wave in the experimental process， the research of transformer oil in each wave under the time breakdown graph and V-s characteristics， calculation of experimental results show that the oscillation waveform breakdown type lightning wave under the wide distribution of oscillating wave voltage breakdown the whole is higher than the standard of lightning， but they are basically the same maximum withstand voltage and lightning under.

Keywords：oscillating impulse； Insulating oil；non-uniform；electric-field；simulation；breakdown characteristics