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Tap Changer College Asia December 9th 2014 Kuala Lumpur
9 Dec 2014
Following several very successful Tap Changer Colleges/Universities in Europe and USA, we have organized this one day event in Kuala Lumpur, Malaysia – on December 9th with collaboration of our partners from TJH2b.
The Tap Changer College Asia was attended by 25 participants from Malaysia, Thailand, China and Australia. It covered several technical aspects of tap changer principles of operation, maintenance, testing, and diagnostics (like DVtest and DGA) for OLTCs. Participants received in depth training in the field where DV Power is the world leader.
Load Tap Changer Fundamentals
An introduction to On-Load Tap-Changers covering the operating principles, regulating and transformer windings connections, OLTC styles, conventional arcing in oil and vacuum technology including the corresponding operational sequences.
Load Tap Changer Diagnostics DVtest
This training session will elaborate on condition diagnosis of electrical contacts of tap changers using DVtest (Dynamic tap changer recording). Principles of the method and positive / negative aspects of various testing procedures. DC testing power transformers requires special approach. Demagnetization and saturation using high current or both windings explained. Synchronization between phases, stabilization, shorting, runaway.
Load Tap Changer Diagnostics DGA
While DGA will be discussed to identify the type of OLTC issues, the DVtest method will identify and locate contact wear and defects on OLTC’s that will be demonstrated and explained. Oil vs vacuum tap changer signatures in DGA – key gasses and source of gassing.
DVtest Case studies
This training session will shed light onto detailed analysis of resistance/reactance tap changer operation, its various contact motion principles, and analysis of DVtest graphs. Tap changer failure modes, and how to detect it before it becomes a disaster will be addressed along with case studies. The AMforum Working group in Europe has been collecting this experience for the last 5 years.
Older types of tap changers now require upgrades or overhaul, prioritizing this task can be accomplished using DVtest procedure accompanied with powerful data analysis.