Discharge detection techniques for stator windings
作者:
A.Wilson,
R.J.Jackson,
N.Wang,
期刊:
IEE Proceedings B (Electric Power Applications)
(IET Available online 1985)
卷期:
Volume 132,
issue 5
页码: 234-244
年代: 1985
DOI:10.1049/ip-b.1985.0034
出版商: IEE
数据来源: IET
摘要:
Partial-discharge measurements are being used increasingly to detect localised or damaged areas in modern high-voltage stator windings. However, ambiguities may arise because of the complexLCnetwork between coils. Discharge pulses propagate in a variety of modes, each having different attenuation factors. Tests with diamond-wound motor stators and a 500 MW generator stator show that pulse detection in a limited frequency range, for example 20–300 kHz, is most suitable. Here, attenuation errors are restricted to within a factor of two to three, whereas a wideband detection with the bandwidth in excess of 1 MHz may produce up to a 50-fold attenuation of signals from sites remote from the terminals of the stator windings. Electromagnetic probes and ultrasonic scanning techniques are useful for locating the sites of high discharge. Their accuracy and limits are reported.
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