Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design

Ching-chau SU; Ya-wen TANG; Cheng-chi TAI; Jiann-fuh CHEN

doi:10.1631/jzus.C1000126

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Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design

电气工程 | Updated：2022-08-31

- Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design
- Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design
- 信息与电子工程前沿（英文） 2011年12卷第4期页码：345-350
- Affiliations：
  
  Department of Electrical Engineering, National Cheng Kung University, Taiwan 70101, Tainan City
- Author bio：
  
  E-mail:ea006@mail.njtc.edu.tw
- Funds：
- DOI：10.1631/jzus.C1000126
  中图分类号：
- 收稿：2010-05-01，
  
  修回：2011-01-31，
  
  录用：2010-05-31，
  
  纸质出版：2011-04
- Accepted：
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Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design[J]. 信息与电子工程前沿（英文）, 2011,12(4):345-350.

Ching-chau SU, Ya-wen TANG, Cheng-chi TAI, et al. Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design[J]. Frontiers of Information Technology & Electronic Engineering, 2011, 12(4): 345-350.
Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design[J]. 信息与电子工程前沿（英文）, 2011,12(4):345-350. DOI： 10.1631/jzus.C1000126.

Ching-chau SU, Ya-wen TANG, Cheng-chi TAI, et al. Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design[J]. Frontiers of Information Technology & Electronic Engineering, 2011, 12(4): 345-350. DOI： 10.1631/jzus.C1000126.

摘要

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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