NDLI: Characteristic of acoustic emission signals generated by electric arc in on load tap changer

Content Provider	IEEE Xplore Digital Library
Author	Cichon, A. Borucki, T. Boczar, T. Zmarzly, D.
Copyright Year	2011
Description	Author affiliation: Dept. of Electr. Eng., Opole Univ. of Technol., Opole, Poland (Cichon, A.; Borucki, T.; Boczar, T.; Zmarzly, D.)
Abstract	Results of scientific research works considering technical condition diagnosis of on load tap changers (OLTC) by use of acoustic emission (AE) method are presented in the paper. OLTC are crucial part of electric power transformers. They enable for on load voltage regulation in the network. Reliable operation of these devices is important especially for distributive transformers but also for units working in mills and industrial plants vulnerable on occurrence of voltage value changes in the network. Operation of OLTC is connected with formation of electric arc which occurs on main contacts and also on resistor contacts. Intensity of this phenomenon depends among others on: scale of current flowing during switch over, wear and tear level of contacts, character of receptions etc. The aim of research works, results of which are presented in the paper, was to determine characteristic parameters, so called “finger prints”, for AE signals generated by ignition of electric arc and in particular determination of the corresponding time-frequency structures. The measurements were performed in a modeling assemble equipped with tap changer including separated selector and power changer that were supplied with single phase voltage, 50 V, forcing current flow, nominal value equal to 150 A. The measurements were performed for each phase separately each time forcing current flow through the contacts accruing to a single phase. Electric arc created during coupling and uncoupling of contacts generated AE signals which were registered with a measuring apparatus equipped with wide band transducer type WD AH-17. Analysis of achieved results was performed in the time-frequency domain by use of short time Fourier transform (STFT), continuous (CWT) and discrete (DWT) wavelet transform.
Starting Page	437
Ending Page	439
File Size	1024286
Page Count	3
File Format	PDF
ISBN	9784886860743
e-ISBN	9784886860743
DOI	10.1109/ISEIM.2011.6826306
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-06
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	The Institute of Electrical Engineers, Japan
Subject Keyword	Switches Current measurement Time-frequency analysis Voltage measurement Continuous wavelet transforms Discrete wavelet transforms Contacts Electric Arc Acoustic Emission On Load Tap Changer
Content Type	Text
Resource Type	Article

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