复合电场下油纸(板)绝缘击穿特性及其数学模型  

Breakdown Characteristics and Its Mathematical Model of Oil-pressboard Insulation Under Compound Electric Field

作　　者：陈庆国[1] 池明赫[1] 高源[1] 魏新劳[1] 王永红[1] 张松 

机构地区：[1]工程电介质及其应用教育部重点实验室(哈尔滨理工大学),黑龙江省哈尔滨市150080 [2]第二炮兵驻哈尔滨地区军事代表室,黑龙江省哈尔滨市150036

出　　处：《中国电机工程学报》2013年第31期170-176,21,共7页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973计划)(2011CB211707);教育部新世纪优秀人才支持计划(NCET-09-0242);黑龙江省杰出青年基金~~

摘　　要：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。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 content 17 was 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.

关 键 词：换流变压器 油纸绝缘 复合电场 击穿特性 电场仿真 数学模型 

分 类 号：TM85[电气工程—高电压与绝缘技术]