Investigation on the partial discharge behaviour in GFRP under AC and combined AC/DC field stress

Conference: VDE-Hochspannungstechnik 2016 - ETG-Fachtagung
11/14/2016 - 11/16/2016 at Berlin, Deutschland

Proceedings: ETG-Fb. 150: VDE-Hochspannungstechnik 2016

Pages: 5Language: englishTyp: PDF

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Saadati, Hassan; Werle, Peter; Gockenbach, Ernst (Leibniz University of Hannover, Institute of Electric Power Systems, Division of High Voltage Engineering and Asset Management, Schering-Institute, Germany)
Seifert, Jens (LAPP Insulators GmbH, Wunsiedel, Germany)

This paper deals with the study of internal partial discharge in voids inside glass-fiber reinforced polymer (GFRP) materials at different temperatures under AC and combined AC/DC field stress. To investigate the partial discharge activities of GFRP materials, a special high voltage circuit have been developed, which could provide AC and combined AC/DC voltage up to 100 kV with different AC to DC ratios. Partial discharge activities in GFRP dielectric under AC and combined AC/DC field stress at 20˚C, 40˚C, 60˚C and 80˚C have been investigated, leading to an equivalent circuit and mathematical model of partial discharges at combined AC/DC field stress. The results show the dependency of partial discharge parameters to the temperature at combined AC/DC and AC field stress, which could be helpful to material selection and environmental condition consideration to utilization of insulation components.