Experimental study of influence of environmental conditions on on-line monitoring data of metal oxide surge arrester

In order to research the influence of the leakage current that flows through the surface of MOA on the online monitoring data of MOA which is caused by the environmental conditions, the authors simulated the different environmental conditions in the laboratory and gained the main characteristic parameters under these different conditions, and with these data the authors analyzed the influencing rules of the different environmental conditions on the on-line monitoring data of MOA, the experimental results showed that the different environmental conditions would affect the on-line monitoring data of MOA, for example, when the temperature increases from 10°C to 120°C, the total leakage current at 120°C is almost as twice as that when temperature is 10°C, and the influences of temperature on the resistive current, basic component of resistive current, thrice component of resistive current and power loss are more remarkable. In the heavy polluted area, the influence of humidity on the on-line monitoring data, of MOA is obvious too. From the experimental results, the main increased component of the leakage current is basic component of resistive current, it increased several decades when the humidity is 10%, and when the humidity increases, it will exist the discharge pulses in the leakage current. So it is not appropriate to compare the on-line monitoring data of MOA with the criterion directly, the influences of these environmental conditions on on-line monitoring data of MOA should be considered and the status of MOA could be estimated correctly.