Abstract
The atmospheric relative humidity (RH) has a great impact on the partial discharge (PD) process which can damage the insulation in operating machines. This work investigates how the relative humidity would affect the PD activities in a metal-dielectric air gap on machine insulation, which consists of mica, epoxy resin and glass-fiber, with the application of periodic alternating trapezoidal voltage waveforms. The results show that the PD characteristics, such as discharge amplitude, the average number of discharge pulses, can be varied greatly with the increasing humidity. This is mainly due to the increased surface conductivity in humid air.
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