NDLI: Primary high-current testing of relays with low ratio current transformers

Content Provider	IEEE Xplore Digital Library
Author	Zocholl, S.E. Mooney, J.B.
Copyright Year	2004
Abstract	This paper will serve as one of few references describing primary high-current testing of protective relays using low ratio current transformers. The tests show the limitations of Fourier and cosine filters used in microprocessor relays that extract the fundamental phasors and eliminate harmonics. The tests validate the operation of a cosine-peak adaptive filter designed to cope with the highly distorted saturated waveforms produced by the low ratio CTs subjected to high current. The details of relay operation are shown in unfiltered event records of the test cases. A report is given on the results of primary high-current tests of overcurrent, motor, and distance relays using low ratio CTs. The test currents ranging from 6 kA to 50 kA were used with current transformers with ratios of 50:5, 300:5, and 600:5. The paper compares the internal unfiltered event records with MATLAB simulations of the same cases.
Sponsorship	IEEE Ind. Applications Soc. Process Ind. Dept. Pulp and Paper Ind. Committee
Starting Page	192
Ending Page	197
File Size	407976
Page Count	6
File Format	PDF
ISBN	078038282X
ISSN	01902172
DOI	10.1109/PAPCON.2004.1338380
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-06-27
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Testing Relays Current transformers Protective relaying Protection Microprocessors Power harmonic filters Adaptive filters MATLAB Discrete event simulation
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Electrical and Electronic Engineering

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