【摘要】 对大量运行的高温硫化硅橡胶(HTV)绝缘子进行了憎水性试验、低温模拟试验、灰密对憎水性的影响以及耐漏电起痕及电蚀损试验,认为高温硫化硅橡胶因老化而引起的憎水性下降、机械强度下降及积污性能下降影响其长期工作的可靠性,所以评价复合硅橡胶的憎水性能除憎水性分级HC值外,还应重点突出评价憎水性的减弱(丧失)特性、憎水性的恢复特性及憎水性的迁移特性。低温模拟试验表明,低温下憎水性有一定程度的下降,应针对性地开发应用于低温地区的高温硫化硅橡胶,并制订新的判定准则。最后对硅橡胶材料老化试验方法进行了讨论,三种试验方法各有其特点,但在短时间内对长期运行性能进行评估,应进一步积累实验室经验,提出1000h盐雾法和5000h老化试验法污液盐度或流速的合理试验条件和现行标准中应规定的允许蚀损开裂数试验判据,从而达到用人工加速老化来准确评估绝缘于长期运行性能的目的。更多还原

【Abstract】 Test of hydrophobicity low temperature simulation,effect of NSDD on hydrophocity and tracking and erosion resistance were made on HTV insulators which being in large scale.It is considered that degradation of hydrophobicity,mechanical strength and pollution deposit which effect their long term service reliability,is caused by HTV rubber ageing.Special care shall be taken for evaluating the degradation,recovery and migration of hydrophobicity beside of its HC class.The low temperature simulation test showed degradation of hydrophobicity in some extent,therefore a HTV rubber for service in low temperature regions shall be developed and new acceptance criterion shall be worked out.Evaluation of three specific ageing test methods for HTV rubber has been discussed,laboratory experience shall be accumulated for evaluating long term service performance in short duration.Reasonable test requirements for 1 000 h salt fog test and 5 000 h ageing test pollutant salinity and velocity as well as criterion of permissible fracture number were proposed for evaluating long term service performance of insulators with artificial accelerate ageing test.更多还原