ABSTRACTThe purpose of this paper is to provide a new experimental method for studying the ultraviolet ageing properties of high temperature vulcanization (HTV) silicone rubber for composite insulators. Combined with relevant standards and the ultraviolet and visible light spectrum and radiation intensity of solar in the high altitude (Yunnan) area in our country, the ultraviolet radiation ageing experimental box featured the adjustable spectral components and power density was designed and set up. The equivalent calculations of the ultraviolet and visible light radiation quantity, by which the samples were aged, were carried out between outdoor natural ageing and ultraviolet accelerated ageing. Ultraviolet accelerated ageing (250−500 h) and outdoor natural ageing tests were carried out at the same time. Scanning electron microscopy (SEM) was used to evaluate the feasibility of ultraviolet accelerated ageing test. The results showed that samples both after outdoor natural ageing tests and ultraviolet accelerated ageing tests, exhibited decline of surface flatness of HTV silicon rubber, increase of voids and grains and further cross-link or oxidization of surface functional groups, all of which illustrated that HTV silicone rubber aged. The ageing extent of HTV silicone rubber is equal between the two kinds of tests under the same effective radiation amount. The method of ultraviolet accelerated ageing test shorten the testing time has very good equivalence and reproducibility and its operations are also simple, and provides a good platform for the research of HTV silicone rubber ultraviolet ageing performance, which is very feasible for researching on the accelerated ageing test of HTV silicone rubber.%为了研究复合绝缘子高温硫化(HTV)硅橡胶紫外辐射老化特性，以我国高海拔（云南）地区日光中的紫外光和可见光能谱和辐射强度为依据，参照相关标准，设计并搭建了光谱成分和功率密度可调的紫外辐射老化试验箱，并对试验箱的辐射量与云南地区户外条件下的辐射量作了等价计算。进行了HTV硅橡胶紫外辐射(250−500 h)加速老化试验和户外自然老化试验。通过两种老化试验前后试样的扫描电镜(SEM)测试结果的一致性来评价紫外辐射加速老化试验方法的可行性。结果表明，紫外辐射加速老化和户外自然老化后试样表面均出现了平整度下降，孔洞和颗粒数增加，试样发生了老化。在有效辐射总量相当的条件下，两种老化试验条件下HTV硅橡胶老化程度相当。紫外辐射加速老化试验可再现性强，大大缩短了试验时间，操作简单，并为HTV硅橡胶紫外老化性能的研究提供了较好的平台，用于HTV硅橡胶加速老化试验研究是切实可行的。
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