直流玻璃绝缘子的研制

The Development of D.C. Glass Insulators

直流输电对绝缘子的防污秽、耐腐蚀和寿命周期等性能提出了较高的要求。介绍了直流玻璃绝缘子的研制过程。直流玻璃绝缘子为耐污型结构,选用大盘径和高矮伞棱交错结构,以提高防污性能。伞棱高度适中,伞槽较宽,积污后便于擦洗。铁帽口和钢脚分别附有锌环和锌套;在直流玻璃配方中掺有适量的稀有元素和调整K20、Na20的配比,提高了产品的体积电阻;玻璃件经钢化处理后,获得较高的机械强度,完全能满足高强度、大吨位直流产品的技术要求。另外,直流玻璃绝缘子经受三次热冷冲击、内水压和玻璃均质热处理三项试验,年自破率可控制在万分之二以内。

Higher request was proposed by D.C. electric transmission to the performance of anti-pollution, anti-corrosion and life cycle for insulator. Development process of D.C. Glass Insulators was introduced. D.C. glass insulators was anti-pollution type structure, so the structure of large diameter and high-low sheds interleaving were selected to improve the performance of anti-pollution. Sheds ridge heigh was moderate and shed slot was wider, easy to scrub after the contamination. Zinc link and zinc sleeve were used in the cap and pin; An amount of rare element mix into the D.C glass prescrip- tion and adjust the allocate proportion of K2O , Na2O to improve the volume resistance of the products. After toughened, the glass shell got higher mechanical strength and could fully satisfy the technical requirements of higher strength and large tonnage for D.C products. In addition, the D.C. glass insulators should subject to three time hot cold impulse, internal water pressure and glass isotropic thermal treatment test, self failure rates could be controlled within two in ten thousand per year.