Effect of direct fluorination on partial discharge characteristics of polyimide film used as magnet wire insulation of generator. Issue 9 (1st June 2016)

• Record Type: Journal Article
• Authors: Du, Boxue; Li, Ang; Liu, Yong
• Is Part Of: IET generation, transmission & distribution. Volume 10:Issue 9(2016)
• Page Start: 2251
• Page End: 2258
• Publication Date: 2016-06-01
• Subjects: wires -- partial discharges -- insulation -- electric fields; time 45 min -- discharge -- magnet wire -- surface charge accumulation -- discharge phenomenon -- PD waveform -- wideband detection system -- electric field -- reaction kettle -- PD behaviour -- electrical properties -- polymer materials -- surface modification -- insulation breakdown -- coils -- magnet wire insulation -- polyimide film -- partial discharge characteristics -- direct fluorination; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2015.1586
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : Polyimide (PI) film is widely used as the insulation between coils in generator, where partial discharge (PD) may occur to cause the insulation breakdown. Fluorination is considered as an effective method for surface modification of polymer materials to change its electrical properties. In this study, to study the effect of fluorination on the PD behaviour of PI film used as magnet wire insulation, the samples of magnet wire were covered by PI film. Samples were fluorinated in a reaction kettle using the F2 /N2 mixture for different time. The non‐fluorinated and fluorinated samples were subjected to partial charges under alternating electric field. A wideband detection system was used to detect PD waveform and record discharge phenomenon. The experimental results indicate that the direct fluorination has great effects on the surface charge accumulation and the decrease in PD intensity. The magnet wire fluorinated for 45 min shows the highest PD inception voltage, the lowest intensity of successive discharges and the smallest number of discharge pulses.