ABSTRACT
With the rapid development of industrial technology of China, atmospheric environment pollution of China has become increasingly serious, pollutant is more and more complex, and the degree of pollution is high. Power grid pollution flashover accident happens from time to time, and its scope expands unceasingly, has become one of the most serious problems, a threat to the safe operation of power system[1-3]. Under the condition of low humidity, even if the transmission line insulator in heavy volume the dirt status, its insulation performance can also with clean insulator insulation performance, only in damp or under the condition of rainfall, the surface of the insulator produces partial discharge, and develops into arc, finally forms the pollution flashover discharge, and brings serious security hidden danger to the electric power system[4-7]. At home and abroad, the mechanism and the causes of pollution flashover were studied, the development of resistance pollution flashover and pollution flashover of insulator is studied, And also did a lot of work to preventing pollution flashover, online monitoring of transmission line insulator pollution extent, such as on-line monitoring leakage current, optical fiber method to measure salt density, monitoring method of local
As shown in Figure 1, this experiment adopts the XP-70 porcelain insulator, the surface of the insulator has gone through special processing, five closed ring metal electrodes was installed on the its surface, annular concave metal electrode embedded in the insulator surface, which is flat and with level surface with the insulator surface, every two ring formed 1 the measurement channel, a total of four, as shown in Figure 2, used as a sensor for measuring insulator surface fouling layer resistance; insulator surface fouling layer resistance monitoring terminal receives signals from the sensors in the insulator surface fouling layer resistance, is used to monitor the insulator surface fouling resistance, then the measured surface of the insulator pollution layer resistance data through the GPRS network to uploaded to the remote data receiving terminal, deposited in the local database; Simulated rainfall watering can used to produce artificial rainfall, to wet wash of polluted insulator surface, the size of the rainfall can be adjusted freely.
