中文摘要：

随着电缆广泛使用,如何评估电缆运行状态,已成为热点问题。为此,选取制作了4条含有中间接头的新电缆,使用加热循环平台对电缆进行了加速老化试验,并进行了宏观电气检测试验和微观材料分析试验。根据试验结果,结合国家标准GB 12706—2008,同时充分考虑电缆运行年限、运行环境、负荷情况、历史故障这些附属因数,提出了1个电缆运行状态评估模型。最后,应用评估模型对实际运行中的新电缆及老化较严重的电缆进行了运行状态评估。试验结果表明,宏观上绝缘电阻、介质损耗角正切值、局部放电和微观上氧化诱导期（OIT）、绝缘结晶度、老化后O元素的质量分数、羰基指数都反映了电缆的老化状态。通过对评估结果进行分析,验证了评估模型能够有效对电缆运行状态的变化作出判断和估计。

英文摘要：

With the widespread application of XLPE cables, it is a hot issue to evaluate the electrical condition of cables. Firstly, we prepared four new cables with attachments and used a heating cycle voltage test platform to accelerate cable aging so as to carry out the electrical tests and material analysis experiments on the cables. On the basis of the results, with the National perspective Standard GB12706--2008, by considering some appendant factors such as running years, operating environment, loading status, and past failures, we established an initial cable condition assessment model com- bining macro and microscopic parameters. Finally, we applied the model to evaluate the states of new and aged cables which were in operation. The results show that the factors, such as the insulation resistance, dielectric loss tangent, partial discharge and oxidation induction time（OIT） on the macro view, insulation crystallinity, mass fraction of O element, and carbonyl index in the micro angle, can reflect the aging states of cables. The evaluation results validate the effectiveness of the model for judgments and can estimate the change of cables operation states.