绝缘特性试验是检验电工设备绝缘性的技术手段。绝缘缺陷从范围看大致可分为两类：集中性的或局部性的缺陷，如内部的气隙、局部的开裂、磨损、受潮等；分布性的缺陷或整体绝缘性能的降低，如绝缘材料的整体受潮、劣化变质等。绝缘内部有了这两类缺陷，其特性都会或多或少发生变化，必须用合适的试验方法及测量仪器，把这些变化或差异正确、灵敏地测量出来，从而对绝缘状态作出恰当判断。
因此，对盘形悬式绝缘子直流覆冰试验方法进行研究，对直流覆冰输电线路外绝缘特性的研究具有重大的意义。
Therefore, it has great significance to research DC icing test methods on disk-shaped suspension insulator for study of DC transmission line characteristics of external insulation.
岭澳核电发电机安装完成后，需要在现场做交、直流耐压试验，以检验发电机的绝缘特性。
The Ling'ao nuclear power generator should carry out the AC and DC withstand voltage tests to check the insulation performances of the unit after finishing the erection work on site.
试验测量了13片XP - 160型绝缘子串空间电场分布特性，并与仿真结果进行比较分析。
The space electric field distribution characteristic of XP-160 type string (13 pieces) was measured by test, and those results were compared with the simulation results.
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