特高压交流棒形悬式复合绝缘子的研究

介绍了特高压交流架空线路用1000kV系列棒形悬式复合绝缘子的研究、设计及试验等情况。以硅橡胶为基料,进行了改性配制的研究试验,结果表明,伞套材料的耐电痕化和蚀损性能与分子量、硫化剂、填料及加工条件等有关,但填料对其影响最大;由两个复合元件组成的复合绝缘子对电场分布没有任何改善,同时元件连接处不加装均压环时,会引起局部的场强集中,尤其是由1/6和5/6两元件组合而成的复合绝缘子,故采用整体单只复合绝缘子比由两个元件组合而成的复合绝缘子好;均压环配置采用大、小均压环结构,可以最大限度地改善绝缘子端部金具与硅橡胶复合界面处的电场分布,对防止电晕、电蚀,提高绝缘子运行可靠性十分有利。

Study on UHV AC Composite Rod Insulator

The study,design and test of 1 000 kV composite rod insulator for UHV AC system were presented.Modified silicone-rubber based elastomer was experimented.The result showed that the tracking and erosion performance of shed housing material depends on molecular weight of elastomer,vulcanizator,stuffing,processing,and the stuffing upmost.Insulator set composed of two insulator unites had no improvement to electric stress distribution.Absence of grading ring at connecting fittings between units may cause local concentrated stress especially in case of insulator set consisting of two units of 1/6 and 5/6 total height.So the insulator of single piece has better performance than that of two units.Dual grading ring arrangement with large and small diameter may in great extent improve the stress distribution at interface of the insulator between end fitting and rubber shield,which is favorable for preventing corona and erosion,and for enhancing the service reliability of insulators.