但敏;郝建;廖瑞金;李彦青;杨丽君;

• 1:输配电装备及系统安全与新技术国家重点实验室(重庆大学)

摘要(Abstract)：

纤维颗粒是运行变压器中绝缘油品质的首要污染者,以矿物油和天然酯为研究对象,在相同直流电场作用下,对不同板-板电极距离下油中纤维颗粒的运动及成桥特性进行了对比分析。研究结果表明:当直流电场相同时,与天然酯相比,矿物油中纤维颗粒运动更快,更容易形成完整的"纤维颗粒桥";矿物油中的"纤维颗粒桥"呈现与电场线方向平行的细圆柱状,而天然酯中"纤维颗粒桥"呈现三角锥形;随着板-板电极距离的增大,矿物油中形成最初"浅桥"所需的时间增大,"纤维颗粒桥"的密度减小,而天然酯则相反。颗粒的存在增大了绝缘油的泄漏电流,但2种油泄漏电流的变化趋势受电极距离的影响不同,天然酯的泄漏电流不易受颗粒影响。自直流加压至撤去电压后,2种绝缘油中的"纤维颗粒桥"均呈现动态变化的4个阶段:颗粒急剧运动阶段、完整"纤维颗粒桥"逐渐形成阶段、"纤维颗粒桥"密度逐渐增大阶段、"纤维颗粒桥"消散阶段。此外,研究发现"纤维颗粒桥"加压时的形成及撤去电压后的消散与电流陡增及陡降存在密切关系。

关键词(KeyWords)： 直流电压;矿物油;天然酯;板-板电极;纤维颗粒

Abstract:

Keywords:

基金项目(Foundation): 中央高校基本科研业务费专项项目(2017CDJZR);; 国家电网公司总部科技项目(混合绝缘油变压器关键技术研究)~~

作者(Author): 但敏;郝建;廖瑞金;李彦青;杨丽君;

Email:

DOI: 10.13335/j.1000-3673.pst.2017.0808

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