access icon free Study on the combined characteristics of UHF and optical signals induced by partial discharge at spacer surface in GIS

© The Institution of Engineering and Technology
Received 20/01/2020, Accepted 18/05/2020, Revised 08/05/2020, Published 22/05/2020

In this study, to improve the sensitivity and accuracy of the detection of surface partial discharge (PD) in gas insulation switchgears (GISs), a combination of ultra-high frequency (UHF) and optical methods is proposed based on an integrated sensor. The PD triggered by a fixed metal needle defect attached to the spacer is detected from PD inception to flashover in a real GIS. The characteristics of UHF and optical signals under different applied voltages are compared and analysed in terms of PD waveform, Phase Resolved Partial Discharge (PRPD) pattern, PD count and amplitude. The results show that the surface discharge process can be precisely divided into three stages according to the combined characteristics of the UHF and optical signals. The comparison of the two detection methods shows that the optical method can detect the weak avalanche PD under low voltage while UHF cannot, so it can detect more PDs than UHF method in an AC cycle. In addition, with the deterioration of solid insulation material, the amplitude of the optical signal increases significantly while the amplitude of the UHF signal only increases slightly.

Inspec keywords: UHF measurement; partial discharge measurement; avalanche photodiodes; photodetectors; optical sensors; gas insulated switchgear; UHF detectors

Other keywords: weak avalanche PD detection methods; PRPD pattern; GIS; fixed metal needle; UHF signal method; PD inception; surface partial discharge process; solid insulation material; spacer surface; PD waveform; optical signal method; gas insulation switchgears

Subjects: Photoelectric devices; Sensing and detecting devices; Charge measurement; Microwave circuits and devices; Microwave measurement techniques; Electrical instruments and techniques; Dielectric breakdown and discharges; Photodetectors

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