Innovative approach toward an algorithm for automated defect recognition for on-load-tap changers

Fahim Riaz*, Jos Wetzer, Armando Rodrigo Mor

*Corresponding author for this work

Research output: Contribution to journalConference articleScientificpeer-review

2 Citations (Scopus)
20 Downloads (Pure)


Power transformers are valuable assets in the power network, with the primary function to regulate the transmission and distribution voltage. The regulating device is the tap changer which sets the turn ratio. Tap changer failure is one of the leading causes of high-voltage power transformer failure. Most tap changer failures are caused by degrading contacts. Contact degradation may be the result of contact wear or of arcing-induced carbon deposition during on-load-tap (OLT) changes. Contact degradation increases contact resistance, causing increased heating and arcing, eventually leading to possible failure of the power transformer. Proper maintenance, therefore, requires a diagnostic system which can assess the condition of the contacts. The research presented is aiming at automated defect recognition and localisation from measured dynamic resistance measurement patterns, for two types of tap changers, the 'Diverter Switch' type and the 'Selector Switch' type OLT changer.

Original languageEnglish
Pages (from-to)246-250
Number of pages5
JournalCIRED - Open Access Proceedings Journal
Issue number1
Publication statusPublished - 2017
EventCIRED 2017: 24th International Conference and Exhibition on Electricity Distribution - Glasgow, United Kingdom
Duration: 12 Jun 201715 Jun 2017

Bibliographical note

Session 1: Network components


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