CLC number: TM403.2
On-line Access: 2011-04-11
Received: 2010-05-01
Revision Accepted: 2010-05-31
Crosschecked: 2011-01-31
Cited: 0
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Ching-chau Su, Ya-wen Tang, Cheng-chi Tai, Jiann-fuh Chen. Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design[J]. Journal of Zhejiang University Science C, 2011, 12(4): 345-350.
@article{title="Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design",
author="Ching-chau Su, Ya-wen Tang, Cheng-chi Tai, Jiann-fuh Chen",
journal="Journal of Zhejiang University Science C",
volume="12",
number="4",
pages="345-350",
year="2011",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.C1000126"
}
%0 Journal Article
%T Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design
%A Ching-chau Su
%A Ya-wen Tang
%A Cheng-chi Tai
%A Jiann-fuh Chen
%J Journal of Zhejiang University SCIENCE C
%V 12
%N 4
%P 345-350
%@ 1869-1951
%D 2011
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.C1000126
TY - JOUR
T1 - Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design
A1 - Ching-chau Su
A1 - Ya-wen Tang
A1 - Cheng-chi Tai
A1 - Jiann-fuh Chen
J0 - Journal of Zhejiang University Science C
VL - 12
IS - 4
SP - 345
EP - 350
%@ 1869-1951
Y1 - 2011
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.C1000126
Abstract: The acoustic emission (AE) method could be used to detect and locate partial discharges (PD) in cast-resin dry-type transformers. However, due to the high sound attenuation in the filled epoxy, the signal is prone to interference from external noises and thus, in practice, there is little possibility of detecting PD. In this study, two techniques were developed to alleviate the shortcomings of the AE method. First, a waveguide is installed on the high-voltage (HV) windings, so that the acoustic signals of PD will propagate to the AE sensors that are installed on both terminals of the waveguide. The location of the winding that has PD can then be detected from the difference in arrival time of the acoustic signals. Test results indicate that the waveguide technique is able to enhance the safety of a measurement system and offers the advantages of easy installation and higher flexibility. Second, a specially designed AE sensor pair is used to distinguish whether acoustic signals are generated by PD inside the HV winding or by the corona outside the transformers. Using these two techniques of waveguide and AE sensor pair not only greatly improves sensitivity but also increases the reliability of the measurement system. Practical test results show that the new techniques can be used to locate precisely the PD in HV windings.
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