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Analysis of Ultraviolet Characteristics of Partial Discharge for Insulators

Partial discharge detection before insulator flashover plays a significant role in external insulation fault diagnosis. Ultraviolet (UV) detection has the advantages of non-contact measurement and high cost performance. This paper studies the relation between time and frequency domain characteristics of UV signals with apparent discharge for insulators at different contamination levels in the relative humidity of 70%-90%. The maximum power spectrum, the power spectrum attenuation of UV signals, the amplitude integral and the number of UV pulses were chosen to explore the partial discharge (PD). The results reflect that the relations between all characteristics of UV pulses with apparent discharge are positive. Both time and frequency domain characteristics of UV signals for discharge insulators are humidity dependent. With higher humidity and pollution density, the characteristics of UV pulses increase at different growth rate.