Abstract
In order to solve the temperature rise problem of GIL basin insulator and prolong the service life of gas-insulated metal-enclosed transmission line (GIL), the surface charge dynamics of epoxy / boron nitride (BN) composite materials with high thermal conductivity with different cooling time after DC corona are investigated. In this paper, using a corona discharge system, epoxy resin specimens were charged and the charge dissipation processes were measured with an electrostatic voltmeter. It is found that at the same temperature, the surface charge dissipation rate of the sample decreases first and then increases with the increase of the nanoparticle content of the sample, while the initial surface charge density increases first and then decreases. For the same sample, as the cooling time increases, the surface charge dissipation slows down but the initial surface charge density increases.
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