Title :
The effect of charge mobility on partial discharge characteristics of enamelled wires for PWM-controlled motors
Author :
Fabiani, D. ; Cavallini, A. ; Mazzanti, G. ; Montanari, G.C.
Author_Institution :
Dept. of Electr. Eng., Bologna Univ., Italy
Abstract :
Partial discharges, which may occur in motor windings supplied by power converters, are associated with space charge accumulation. Space charge is able to modify the electric field which sustains partial discharges, affecting amplitude, repetition rate and inception voltage. This paper presents a simplified model which takes into account the dynamic of charge accumulation generated by the partial discharge process. In particular, among electrical properties surface conductivity is considered and related to the electric field governing partial discharge activity.
Keywords :
PWM power convertors; air insulation; carrier mobility; electric motors; insulated wires; machine windings; partial discharges; space charge; surface conductivity; PWM controlled motors; charge mobility; electric field; electrical properties; enamelled wires; motor windings; partial discharge amplitude; partial discharge inception voltage; partial discharge repetition rate; power converters; space charge accumulation dynamics; surface conductivity; AC motors; Dielectrics and electrical insulation; Partial discharges; Pulse width modulation; Pulse width modulation converters; Pulse width modulation inverters; Space charge; Variable speed drives; Voltage; Wires;
Conference_Titel :
Solid Dielectrics, 2004. ICSD 2004. Proceedings of the 2004 IEEE International Conference on
Print_ISBN :
0-7803-8348-6
DOI :
10.1109/ICSD.2004.1350566
