Vibration Analysis Using Envelope Wavelet for Detecting Faults in the OLTC Tap Selector

Author

Rivas, Edwin ; Burgos, Juan Carlos ; García-Prada, Juan Carlos

Author_Institution

Electr. Eng., Univ. Distrital Francisco Jose de Caldas, Bogota, Colombia

Volume

25

Issue

3

fYear

2010

fDate

7/1/2010 12:00:00 AM

Firstpage

1629

Lastpage

1636

Abstract

An onload tap changer (OLTC) in suitable conditions is essential for the operation of a power transformer. It is extremely desirable to have indicators that help assess the conditions of the OLTC, especially if these indicators can be used in an on-line monitoring system that does not affect the normal operation of the transformer. This paper describes a method for detecting faults in the tap selector by means of vibration measurements during tap changer operation, using envelope analysis based on Hilbert transform and wavelet decomposition. Different failures at the tap selector can be distinguished in the vibration signature as they are reflected in different parts of that signature. The diagnosis parameters allowing the most selective failure classification are found.

Keywords

Hilbert transforms; fault diagnosis; power transformers; vibration measurement; vibrations; Hilbert transform; OLTC tap selector; envelope wavelet; fault detection; on-line monitoring system; onload tap changer; power transformer; vibration analysis; vibration measurements; wavelet decomposition; Electrical resistance measurement; Envelope detectors; Failure analysis; Fault detection; Oil insulation; Power transformers; Switches; Vibrations; Wavelet analysis; Wavelet transforms; Hilbert transform vibration analysis; onload tap changer (OLTC); wavelet transform;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2010.2043746

Filename

5491373