103 / 2018-08-24 17:15:33

Research on the Influence of Consistent Arc on performance of Composite Insulators in Areas of high temperature and high humidity

Composite insulators , silicon rubber, consistent arc, high temperature, high humidity

The southern China is located in high-temperature and high-humidity areas with long and high rainfall. Affected by the sea breeze, The saltness on the surface of Composite insulators in Guangdong is higher than others, which will lead to a decrease in the surface resistivity of composite insulators. It can be found that some birds lived in such environment like to peck composite insulators. What’s more, composite insulator umbrella skirts may be teard when typhoon landed. These factors will lead to insulation damage. If the insulator is damaged and exposed to continuous rain, there may be a consistent arc on the surface of the insulator due to electric field distortion caused by insulator’s damage. To explore the effect of continuous arc on the properties of silicone rubber materials operating on natural environment, We chose four groups of the silicon rubber samples with different contents of ATH and silica and coat them with kaolin in order to simulate natural pollution. ESDD was set as 1g/cm3 and NSDD was 0.1g/cm3. Insulators were placed in the electric tracing equipment, the voltage of 2.5 kV, 3.5 kV, 4.5 kV, 6 kV and the corresponding current velocity are applied to simulate the actual aging process according to the relevant passage. There was obvious continuous on the surface of silicone rubber materials during the test. The whole process toke about six hours. The samples were taken out every 1.5 hours during the test, and the transverse relaxation time and residual mass were measured respectively, also the hardness, lightness and static contact angle of the samples were carried out after the test . The result shows that the transverse relaxation time and residual mass of silicone rubber decrease with the increase of accelerated aging time. If the residual mass decreases to a certain value ，the silicone rubber material sample can not continue to run when the discharge is concentrated in a certain area on the surface of silicone rubber. After the aging process, the lightness and static contact of the sample decreased, and the hardness changed little. At the same time, it can find that the higher the relative content of ATH and silica, the better the performance of silicone rubber under the action of continuous arc when the rubber content reaches a certain proportion by comparing the properties of silicone rubber with different components. What’s more, we could infer whether the electric field of insulator was distorted or not under the running process by above parameters.