中文摘要：

为探究复合绝缘子用HTV硅橡胶材料的电导机制，以现场运行及人工加速老化试验的复合绝缘子为对象进行研究，通过电导电流测量装置对试品进行电导电流测试，总结材料的电导特性。研究初步发现：当HTV硅橡胶材料处于低场强试验阶段时（约0～5kV／mm）。材料的电导电流，与场强E满足欧姆定律成正比关系；当材料处于较高场强试验阶段时（约5～30kV／mm），材料的电导特性处于空间电荷限制电流区，材料内部的陷阱开始捕获流经的载流子形成空间电荷；当材料处于高场强试验阶段时（约30～40kV／mm），材料的电导特性进入了陷阱充满的空间电荷限制电流区，材料随时有被击穿的可能；电老化阈值与陷阱能级、陷阱载流子密度等有着一定的对应关系：HTV材料经过人工电晕加速老化试验后，电导电流数值大幅增加、电老化阈值明显降低。此外，电老化阈值实质反应的是材料的空间电荷形成的难易程度，一定程度上反应HTV材料的老化状态。有待进一步研究。

英文摘要：

In order to investigate the conductance characteristics of HTV silicone rubber materials for composite insulators, experimental research is done on composite insulator in field and artificial accelerated ageing test. The conductance current of the samples are measured by the conduction current measuring device, and the conductance characteristics of the samples are summarized. Preliminary study found that if the HTV silicone rubber material is in the low field strength test phase（about 0～5 kV/mm）, the test of the conductance current I and the field strength E satisfy Ohm＇s Law; if the material is in a higher field strength test phase（about 5-30 kV / mm）, conduction current characteristics of materials is in space charge limiting current（SCLC） region, the traps inside the material began to capture the carrier to form space charge; if the material is in the high field strength test phase（about 30-40 kV/mm）, the conductance characteristics of the samples entered the trap filled space charge limited current, and the sample may have the potential of breakdown. The electrical degradation threshold has a certain corresponding relationship with the trap level and trap carrier density, after the artificial corona accelerated aging test, the conduct current value is increased and the electrical degradation threshold are significantly decreased. In addition, the electrical degradation threshold react the difficulty of the space charge formation of the material and partly to reflect the aging state of HTV materials, further research is needed.