CAJ | 학술논문

为研究油纸复合绝缘在复合电场下的击穿特性，以典型油-纸绝缘结构为主要研究对象，首先通过试验方法得到了典型油-纸绝缘在复合电场下的击穿特性；又根据等效电路模型得到仿真边界条件，对变压器油和绝缘纸板中的电场分布进行了仿真分析；然后，分别对变压器油和浸油纸板的击穿特性进行了测试。根据两种介质中电场的数学表达式，得到了电场E和交流百分含量η之间的关系，并将其电场分布图像与油、纸板的击穿场强进行了比对和分析，总结出油纸复合绝缘击穿电压随交流含量变化的数学表达式。据此，提出随交流含量变化两种介质中的电场强度改变和各自介电强度的差别是导致整体击穿电压呈现先升后降趋势的主要原因。
위연구유지복합절연재복합전장하적격천특성，이전형유-지절연결구위주요연구대상，수선통과시험방법득도료전형유-지절연재복합전장하적격천특성；우근거등효전로모형득도방진변계조건，대변압기유화절연지판중적전장분포진행료방진분석；연후，분별대변압기유화침유지판적격천특성진행료측시。근거량충개질중전장적수학표체식，득도료전장E화교류백분함량η지간적관계，병장기전장분포도상여유、지판적격천장강진행료비대화분석，총결출유지복합절연격천전압수교류함량변화적수학표체식。거차，제출수교류함량변화량충개질중적전장강도개변화각자개전강도적차별시도치정체격천전압정현선승후강추세적주요원인。
In order to study the breakdown characteristics of oil-pressboard insulation under compound electric field, the typical oil-pressboard insulating structure was taken as the study object. The breakdown characteristic of typical oil-pressboard insulation was obtained under compound electric field via breakdown tests at first. Then the electric fields in oil and oil-impregnated pressboard were simulated according to the equivalent circuit. The breakdown characteristic tests of oil and oil-impregnated pressboard were carried out separately under compound electric field. On the basis of the electric field mathematical expressions of the oil and oil-impregnated pressboard, the relationship between the electric field E and AC contentηwas got, and the electric field distribution in oil and oil-impregnated pressboard was compared with their breakdown strengths. And then the breakdown voltage mathematical expressions with AC content were concluded. The results showed that the main reason why the breakdown voltage of oil-pressboard insulating structure rises before and falls later is that the electric fields in the two materials vary with the AC content and there is difference in breakdown characteristics between two materials.