摘要
变电站支柱类绝缘子比线路绝缘子更容易覆冰,对输电线路影响更严重。为了获取特高压(UHV)变电站支柱类绝缘子覆冰后电气特性,建立了基于Obenaus概念的特高压支柱绝缘子重覆冰闪络物理模型,对比了固体涂层法和覆冰水电导率法试验得到的闪络电压结果。试验得出:覆冰水电导率和表面盐密对闪络电压的影响相互独立且均为负幂指数趋势;不同的污秽度与不同覆冰水电导率之间具有线性对应关系。建立了计算模型,将污秽和喷淋水电导率对覆冰闪络电压的综合影响等效为只有冰层没有污层的状态,降低了计算的难度。利用该模型计算了重覆冰条件下特高压支柱绝缘子的闪络电压,结果与试验验结果的误差<10%,验证了模型的准确性。
Substation post insulators are easier to ice than line insulators,and they impact transmission lines more seriously.In order to obtain icing electrical performance of ultra high voltage（UHV） substation post insulators,we established a flashover model of post insulators in serious icing condition based on the Obenaus concept.Moreover,we tested on the model by using solid layer method and applied water conductivity method,and compared the results.The comparison showed that the influences of surface salt density and icing water conductivity on the flashover voltage were independent from each other while both showing a negative exponent trend,and the degree of pollution had a linear relationship with the icing water conductivity.A model for calculation was established by considering only an equivalent icing representing the combined effects of pollution and applied icing water conductivity,which reduced the difficulty of computing.The model was adopted to calculate the flashover voltages of post insulators in serious icing,and the error of the computed results from the test results was less than 10%,proving the model to be accurate.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第3期612-617,共6页
High Voltage Engineering
基金
国家电网公司科技项目(SG0923)~~
