直流复合绝缘子在耐张串上的应用及试验分析

为研究直流复合绝缘子应用在耐张串上的可行性,提高线路安全运行的可靠性,分析了耐张串复合绝缘子的受力,认为它能承受运行中可能出现的拉伸、扭转、弯曲、振动等各种载荷;对已运行1年的龙政线耐张串直流棒形悬式复合绝缘子的试验分析表明,其电气和机械性能无任何下降。因此复合绝缘子完全可应用在耐张串上,≤220 kV电压等级线路建议推广应用,≥330 kV电压等级线路建议2~4串并联小批量试运行,积累运行经验。建议针对耐张串复合绝缘子实际运行的电气和机械工况,研究适合于复合绝缘子的试验方法。

Application Research and Operation Testing Analysis for Tension String Consisted of ±500 kV DC Composite Insulators

In order to research feasibility for transmission lines tension composite insulators, according to stress analysis result of the tension composite insulator string, composite insulator could sustain the tension, torsion, bend, vibration and other load which appear in operation, and the effect on mechanical property of composite insulator is little. The test results indicate that the electrical and mechanical property of the d c. tension composite insulators which have been operated in Longzheng power line for one year are well. Thus the composite insulators could be applied on the tension composite insulators string. The suggestion is given that the composite insulators could be used in 110 kV and 220 kV transmission line, for 2-4 strings parallel connecting with a little batch operated in 330kV, 500kV,750kV and 1000kV line it need to accumulate the operation experience. The suited test method of composite insulators should be studied according to actual operation condition for tension composite insulator string, including pull-wrest composite characteristic,bending fatigue characteristic and great flexion characteristic for different structure and manufacture technique.