NDLI: Operation condition for zone 3 impedance relays during low-frequency power swings

Content Provider	IEEE Xplore Digital Library
Author	Shenghu Li Ming Ding Yorino, N. Zoka, Y.
Copyright Year	2008
Description	Author affiliation: Sch. of Electr. Eng. & its Autom., Hefei Univ. of Technol., Hefei (Shenghu Li; Ming Ding)
Abstract	Low-frequency power swings during contingencies and loads surges may undesirably activate impedance relays on transmission lines, and enlarge the blackouts. In this paper, the operation condition of zone 3 impedance relays (mho relays) during unstable low-frequency power swings is newly described by a polynominal function to quantify the critical swing angles and frequency with different relay setting and system parameters, and find the contributing factors leading to relay operations. The numerical results shows: (1) the swing loci are more densely populated inside than outside of the protection region, which corresponds to long residence time, and possibly causes relay operation; (2) with different relay settings and system parameters, the relays may be sensitive to load encroachments and power swings; (3) relays more probably operate with shorter time setting and lower swing frequency.
Starting Page	2316
Ending Page	2321
File Size	517727
Page Count	6
File Format	PDF
ISBN	9787900714138
DOI	10.1109/DRPT.2008.4523798
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-04-06
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	DRPT
Subject Keyword	Impedance Relays Power system relaying Protective relaying Frequency Surge protection Power transmission lines Voltage Performance analysis Power generation transmission system Power swing impedance relay operation condition
Content Type	Text
Resource Type	Article

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