Abstract
To ensure the safe operation of the gas insulated switchgear (GIS), more and more GIS will be tested under impulse voltage on-site. Oscillating impulse voltage is very suitable for the test due to the high efficiency. By detecting the partial discharge (PD) during the process of on-site impulse withstand voltage test, the insulation state of GIS can be overall known. Surface defect in GIS is typical and harmful, so it is very significant to research the PD characteristics of surface defect in GIS under oscillating impulse voltage. In this paper, a surface defect model was designed. The oscillating impulse voltage generator in this paper could generate oscillating lightning impulse voltage (OLI) and oscillating switching impulse voltage (OSI). The pulse current and UHF method were used to detect the PD signals. The PD sequences, PD phase distribution, PD amplitude and PD density were analyzed. The results show that the negative PDs happen at the rising edge of voltage, and the positive PDs happen at the rising edge of voltage. The PD magnitudes and the PD numbers increase linearly with the increase of voltage. Moreover, the PCA (phase circle amplitude) spectrum and OPRPD (oscillating phase resolved partial discharge) spectrum were introduced to describe the PD characteristics of surface defect. The results in this paper are very helpful for the impulse withstand voltage test in field.
Published Version
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