Diagnosis of degradation effects of on-load tap changer in power transformers

Author

Jongen, Rogier ; Parciak, JarosÅ‚aw ; Gulski, Edward ; SiodÅ‚a, Krzysztof ; Erbrink, Jur

Author_Institution

Onsite hv solutions AG, Lucerne, Switzerland

fYear

2014

fDate

8-11 Sept. 2014

Firstpage

1

Lastpage

4

Abstract

By performing diagnostics on on-load tap changers by means of dynamic resistance measurements a condition diagnosis of high-speed resistor-type tap changers can result in pre-failure detection of contact degradation. It provides the measurement parameters that are most suitable for detecting these defects, such as the presence of a contact film, contact wear and pitting. The resistance curves of OLTCs are interpreted, to determine the occurring degradation mechanisms, which can be used to support strategic decisions about the maintenance or overhaul of the tap changer.

Keywords

failure analysis; fault diagnosis; on load tap changers; power transformers; OLTC; contact degradation prefailure detection; contact film presence; contact wear; degradation effect diagnosis; degradation mechanism; dynamic resistance measurement; high-speed resistor-type tap changer; on-load tap changer; pitting; power transformer; resistance curve; tap changer overhaul; Aging; Friction; Inspection; Pollution measurement; Pressure measurement; Switches; Temperature measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

High Voltage Engineering and Application (ICHVE), 2014 International Conference on

Conference_Location

Poznan

Type

conf

DOI

10.1109/ICHVE.2014.7035469

Filename

7035469