【摘要】 为了研究500kV超高压瓷支柱绝缘子加装复合增爬裙(CAS)后的覆冰闪络电压特性,在特高压交流试验基地的大型环境气候实验室开展了500kV瓷支柱绝缘子加装CAS和未装CAS的覆冰闪络试验。研究并分析了2种工况下支柱绝缘子覆冰状态、闪络电压、泄漏电流发展以及放电路径。研究结果表明,加装CAS的瓷支柱绝缘子可有效阻止冰棱的形成,并且增爬裙之间不会被冰棱桥接,其放电主要沿冰棱和气隙发展。在绝缘子表面有污秽的覆冰状态下,带有CAS的500kV瓷支柱绝缘子覆冰闪络电压大于最大运行相电压,较未装CAS的支柱绝缘子提高约58%。更多还原

【Abstract】 In order to analyze the icing flashover characteristics of post insulators with composite assistant shed(CAS),we investigated the performance of energized 500 kV post insulators in the presence and absence of CAS by icing test in a large-scale artificial climate chamber,and analyzed the difference of ice appearance,flashover voltage,development of leakage current and discharge path between post insulators in the presence and absence of CAS.Test results demonstrate that CAS can decelerate icicle development in the insulators and the sheds will not be bridged by icicle,which results in its discharge path mainly along the icicle and air gaps.Due to the composite antipollution shed,in the condition of being seriously iced and polluted,the flashover voltage of 500 kV station post insulators is higher than the maximum running phase to earth voltage,which is 58% higher than normal post insulators.更多还原