电网技术
電網技術
전망기술
Power System Technology
2015年
9期
2633-2639
,共7页
贾志东%胡亚荣%关志成%韦晓星
賈誌東%鬍亞榮%關誌成%韋曉星
가지동%호아영%관지성%위효성
输电线路%半导体RTV涂层%防冰%污闪特性
輸電線路%半導體RTV塗層%防冰%汙閃特性
수전선로%반도체RTV도층%방빙%오섬특성
transmission line%semiconductive RTV coating%anti-icing%pollution flashover characteristics
覆冰对电力系统的安全运行产生了一定威胁.使用部分涂覆半导体RTV涂层的绝缘子是一种效果较好的防覆冰方法.半导体涂层利用泄漏电流的热效应来加热和蒸发绝缘子表面的水膜.为研究半导体涂层绝缘子在积污条件下是否能够安全运行,对不同涂层阻值和不同涂层涂覆结构的 110 kV绝缘子串进行一系列的污闪试验.试验采用固体涂层法,通过测定 50%耐受电压来评估半导体涂层绝缘子的污闪特性.试验结果表明:50%耐受电压受涂层阻值和涂层涂覆结构的影响.部分涂覆半导体涂层绝缘子的 50%耐受电压与盐密仍然基本符合负幂指数关系,盐密对半导体涂层绝缘子的影响要低于其对无涂层绝缘子的影响;在相同的涂层涂覆结构下,下表面涂层阻值越大,50%耐受电压越高.在相同的涂层阻值下,50%耐受电压与上表面涂层涂覆范围基本呈线性关系,上表面涂覆范围越大,50%耐受电压越低.基于以上试验结果,从污闪特性的角度给出了半导体涂层的优化建议.
覆冰對電力繫統的安全運行產生瞭一定威脅.使用部分塗覆半導體RTV塗層的絕緣子是一種效果較好的防覆冰方法.半導體塗層利用洩漏電流的熱效應來加熱和蒸髮絕緣子錶麵的水膜.為研究半導體塗層絕緣子在積汙條件下是否能夠安全運行,對不同塗層阻值和不同塗層塗覆結構的 110 kV絕緣子串進行一繫列的汙閃試驗.試驗採用固體塗層法,通過測定 50%耐受電壓來評估半導體塗層絕緣子的汙閃特性.試驗結果錶明:50%耐受電壓受塗層阻值和塗層塗覆結構的影響.部分塗覆半導體塗層絕緣子的 50%耐受電壓與鹽密仍然基本符閤負冪指數關繫,鹽密對半導體塗層絕緣子的影響要低于其對無塗層絕緣子的影響;在相同的塗層塗覆結構下,下錶麵塗層阻值越大,50%耐受電壓越高.在相同的塗層阻值下,50%耐受電壓與上錶麵塗層塗覆範圍基本呈線性關繫,上錶麵塗覆範圍越大,50%耐受電壓越低.基于以上試驗結果,從汙閃特性的角度給齣瞭半導體塗層的優化建議.
복빙대전력계통적안전운행산생료일정위협.사용부분도복반도체RTV도층적절연자시일충효과교호적방복빙방법.반도체도층이용설루전류적열효응래가열화증발절연자표면적수막.위연구반도체도층절연자재적오조건하시부능구안전운행,대불동도층조치화불동도층도복결구적 110 kV절연자천진행일계렬적오섬시험.시험채용고체도층법,통과측정 50%내수전압래평고반도체도층절연자적오섬특성.시험결과표명:50%내수전압수도층조치화도층도복결구적영향.부분도복반도체도층절연자적 50%내수전압여염밀잉연기본부합부멱지수관계,염밀대반도체도층절연자적영향요저우기대무도층절연자적영향;재상동적도층도복결구하,하표면도층조치월대,50%내수전압월고.재상동적도층조치하,50%내수전압여상표면도층도복범위기본정선성관계,상표면도복범위월대,50%내수전압월저.기우이상시험결과,종오섬특성적각도급출료반도체도층적우화건의.
Icing problem has threaten the power system for decades. Semi-conductive RTV coating has already been proved to be a good solution to anti-icing issues, which could be treated partially on insulators' surface so that water film could be heated and vaporized by the thermal effect of leakage current. In order to study the operation security of insulator strings partially treated with semi-conductive RTV coating under contaminated condition, a series of pollution flashover performance tests on 110 kV insulator string specimens with different resistivity and configuration of semi-conductive RTV coating were conducted and analyzed in this paper. The pollution flashover characteristic of insulators treated with semi-conductive RTV coating were assessed by the 50% withstand voltage U50% and the test was conducted based on solid layer method.The result shows that theU50% is affected by the resistivity and configuration of semi-conductive RTV coating. TheU50% of insulator strings partially treated with semi-conductive RTV coating is basically in negative exponential relationship with salt deposit density (SDD). Compared with insulator strings partially treated with semi-conductive RTV coating the influence of SDD onU50% of insulator strings without coating is greater. When under the same coating configuration condition, theU50% of insulator strings increases with the increase of lower surface coating resistivity. On the other hand, theU50% decreases with the increase of coated area on upper surface of insulator strings in a linear relationship when the resistivity of coating is fixed. Based on the obtained results, suggestions for improving AC pollution flashover performance of 110 kV glass insulator strings partially treated with semi-conductive RTV coating were proposed.