进口500kV复合绝缘子断裂原因分析与研究

对X.M公司、M.K公司和D.H公司产500 kV复合绝缘子的断裂原因分析、试验、研究、论证和模拟仿真电场分布理论计算,结果表明:X.M公司的复合绝缘子存在严重的质量问题;M.K公司的复合绝缘子在采取措施后可以继续使用;D.H公司非标加工的500kV/300kN级复合绝缘子,其芯棒密实性、渗透性能不符合标准要求;建议500 kV复合绝缘子应选用耐酸芯棒,优质、合理的硅橡胶配比胶料,经高温硫化的伞套材料;采用迷宫形端部金具密封结构及高温硫化硅橡胶模压密封,且护套整体厚度至少≥5 mm;对500 kV复合绝缘子下端部50 cm区域内适当增加护套厚度;对均压环的环径和管径大小最佳尺寸以及安装位置,还需试验验证,以优化合理配置均压环,确保有效提高复合绝缘子的使用寿命,确保500 kV线路电网的安全运行。

Analysis and Study on Fracture Causes of Imported 500 kV Composite Insulator

Analysis,testing,research,demonstration and simulation theory of electric field distribution calculation were taken out on the causes of the fracture of company X.M,M.K and D.H,The results showed that: there is a serious quality problems on XM’s composite insulators;MK’s composite insulator can be continue to use after taking measures;for DH’s non-standard processed 500 kV / 300 kN composite insulator,its rod density,permeability does not meet standards requirements;it was proposed to use 500 kV composite insulator with acid-resistant rod,high quality silicone rubber compound of reasonable ingredient ratio and HTV shed material;with maze-shaped end fittings seal structure and high temperature vulcanized silicone rubber molding seal,housing overall thickness should be at least ≥5 mm;increase the housing thickness properly within the region of 50cm on the bottom of 500 kV composite insulator;the grading ring diameter and its caliber size as well as its installation location should be optimized by experiments,to ensure increase of the service life of the