特高压电气设备用高性能复合绝缘材料配方的研制

Development of high performance composite insulating material formula for UHV electrical equipment

针对特高压电气用环氧树脂材料力学、电、热性能协同性不高问题,采用复配、扩链增韧与封端技术研制了由环氧树脂、酸酐固化剂和填料氧化铝组成的高性能环氧树脂浇注材料配方体系,其玻璃化温度达135℃以上,冲击强度14 kJ/m^2、弯曲强度162 MPa,拉伸强度92 MPa,介电强度33 kV/mm。通过与进口环氧树脂配方体系对比发现,国产环氧树脂材料拉伸强度、弯曲强度、冲击强度均有较大幅度提高,尤其是高温下的力学强度,且电气性能略优。以其制造的1100 kV交流特高压盆式绝缘子通过了水压(≥4.0 MPa)破坏和液氮急剧冷却实验(115~0℃)测试。

Aiming at the problem of low synergy between the mechanical,electrical and thermal properties of epoxy resin materials for UHV electrical applications,a high-performance epoxy resin casting material formula system composed of epoxy resin,acid anhydride curing agent and filler alumina was developed using compounding,chain extension,toughening and end-capping technologies.Its glass transition temperature was above 135℃,impact strength,flexural strength,tensile strength and dielectric strength was 14 kJ/m^2,162 MPa,92 MPa and 33 kV/mm,respectively.Compared with the imported epoxy resin formula system,it was found that the tensile strength,flexural strength and impact strength of domestic epoxy resin materials were greatly improved,especially the mechanical strength at high temperature,and the electrical performance was slightly better.The 1100 kV AC UHV basin insulator manufactured by it passed the water pressure(≥4.0 MPa)destruction and liquid nitrogen rapid cooling tests(115-0℃).