DocumentCode :
2418130
Title :
Partial discharge behavior on PI film with microgap under steep-front step voltage
Author :
Kimura, Ken ; Itaya, Suguru ; Hikita, Masayuki
Author_Institution :
Kyushu Inst. of Technol., Kitakyushu, Japan
fYear :
2002
fDate :
7-10 Apr 2002
Firstpage :
1
Lastpage :
4
Abstract :
Power devices such as IGBT generate switching surges with steep-front waveform in sub-microsecond times. The highly repetitive surges may lead to unexpected insulation ageing of inverter-fed low-voltage motor windings, which have been designed without consideration of partial discharges (PD). Since the distance between adjacent magnet wires in a stator slot distributes in μm to mm, so-called micro-discharge of very short gap with steep-front surges have been investigated. In order to evaluate PD ageing of polymer material under steep-front surges, we started the fundamental study of PD inception condition under step voltage with rise-time of nanoseconds. Using rod-plate electrodes with 20-50 μm air gaps, time delay and charge buildup were measured simultaneously. It was found that charge builds up with PD instantly and decreases very slowly in comparison with repetitive pulse intervals of PWM. The effect of the surface charge on PD inception of the following surge is discussed
Keywords :
ageing; electrodes; machine insulation; organic insulating materials; partial discharge measurement; stators; surges; 20 to 50 micron; IGBT; Kapton film; PD; PD ageing; PD inception condition; PI film; adjacent magnet wires; air gaps; charge buildup; highly repetitive surges; insulation ageing; inverter-fed low-voltage motor windings; micro-discharge; microgap; partial discharge behavior; partial discharges; polyimide film; polymer material; power devices; rod-plate electrodes; stator slot; steep-front step voltage; step voltage; switching surges; time delay; very short gap; Aging; Insulated gate bipolar transistors; Insulation; Partial discharges; Polymers; Power generation; Pulse width modulation; Stators; Surges; Wires;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Insulation, 2002. Conference Record of the 2002 IEEE International Symposium on
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-7337-5
Type :
conf
DOI :
10.1109/ELINSL.2002.995867
Filename :
995867
Link To Document :
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