NDLI: Advances in Multifunction Digital Transformer Relays

Content Provider	IEEE Xplore Digital Library
Author	Mozina, C.J.
Copyright Year	2006
Description	Author affiliation: Beckwith Electr. Co., Inc., Largo, FL (Mozina, C.J.)
Abstract	The application of multifunction digital relays to protect power transformers has become a common utility practice. These relays provide more than just differential protection, but offer a full range of transformer protective functions including: overexcitation, restricted earth fault, overcurrent backup, thermal, and breaker failure protection in a single hardware platform. The paper presents an overview of reasons for transformer failure as well as IEEE through fault-withstand standards. The paper also presents element design changes made possible by digital technology such as: use of multiple harmonics and cross-phase inrush restraint to enhance security on transformer energizing, and overexcitation harmonic restraint to desensitize tripping rather than block all tripping. Advancements in digital technology have provided many technical improvements and have allowed relay manufacturers to include more relay functions within a single hardware platform - including addressing more transformer winding configurations. This has increased complexity resulting in digital transformer relays that require an Einstein to set or an Edison to commission. Since there are few Einsteins and Edisons among us, the next generation of transformer relays needs to concentrate on this complexity issue in addition to technical improvements. The author believes that these issues are the major shortcomings of many existing digital transformer protective relays which have resulted in improper setting of many transformer protection relays by less-experienced relay engineers
Starting Page	858
Ending Page	862
File Size	1292362
Page Count	5
File Format	PDF
ISBN	0780391942
DOI	10.1109/TDC.2006.1668610
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-05-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Digital relays Power transformers Protective relaying Hardware Earth Paper technology Surge protection Security Manufacturing Windings
Content Type	Text
Resource Type	Article

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