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October 24, 2011

Mtg: Key Considerations in Application of Current Transformers in Protective Relaying Systems

by @ 4:56 pm. Filed under ALL, Electrical/Power, Electronics Design
 

THURSDAY October 27, 2011
OEB Industry Applications Chapter
Speaker: Normann Fischer, Schweitzer Engineering Laboratories, Inc.
Time: No-host social at 5:30 PM; Presentation at 6:15 PM; Dinner at 7:15 PM; Presentation continues at 8:00 PM
Cost: $25 for IEEE members, $30 for non-members, $15 for student and retired members
Place: Zio Fraedos, 611 Gregory Lane, Pleasant Hill
RSVP: by October 24, by contacting Gregg Boltz, gboltz@brwncald.com or telephone (925) 210-2571
Web: www.e-grid.net/docs/1110-oeb-ias.pdf

Current transformers (CTs) are critically important components of medium voltage industrial protective relay systems.? CT performance during fault conditions determines the quality of transformed current signal levels sensed by protective relays.? Hence, overall protective system response to electrical faults is dependent on CT performance, as well as relay and breaker operating behavior.? This presentation will include a discussion on:
– What is CT saturation, why do we care, and how do we avoid and/or minimize it?
– How do electromechanical, analog, and modern digital relays respond to a saturated CT output?
– How does CT performance affect medium voltage feeder overcurrent and differential protection systems?
– What are รข??CT burden calculations,??? and why are they important?
– What are the tradeoffs between current transformer Class, Size, and Saturation?

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