NDLI: Tapchangers for de-energized operation in natural ester fluid, mineral oil and silicone

Content Provider	IEEE Xplore Digital Library
Author	Dix, L. Hopkinson, P.J.
Copyright Year	2009
Abstract	Natural Ester seed oil is a biodegradable fluid that is increasingly being used as a replacement for mineral oil and for high temperature flashpoint liquids, including silicone and RTEMP. Electrical contact coking in mineral oil and in silicone has been a common problem with many types of contact materials in tapchangers for de-energized operation and also the reversing switch in load tapchangers. In recent years, an accelerated aging functional life test has been developed and presented to the Transformers Committee of IEEE that has had a good correlation with field data to sort out stable versus unstable combinations. This paper presents a comparative look at Natural Ester fluid versus mineral oil and silicone for several popular contact pairs, and has been updated from our 2006 report to include additional materials. In addition to its biodegradability, Natural Ester is shown to have considerably better thermal stability with contact pairs that are unstable in both mineral oil and silicone.
Starting Page	1
Ending Page	6
File Size	778603
Page Count	6
File Format	PDF
ISBN	9781424442416
ISSN	19449925
DOI	10.1109/PES.2009.5275165
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-07-26
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Minerals Petroleum Biodegradable materials Contacts Biological materials Switches Temperature Liquids Accelerated aging Life testing Tapchangers Life estimation Contact coking Mineral oil Natural Ester Silicone
Content Type	Text
Resource Type	Article

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