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

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. T...

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Main Authors:	Zocholl, S.E., Mooney, J.B.
Format:	Conference Proceeding
Language:	English
Subjects:	Adaptive filters Applied sciences Connection and protection apparatus Current transformers Discrete event simulation Electrical engineering. Electrical power engineering Exact sciences and technology MATLAB Microprocessors Power harmonic filters Protection Protective relaying Relays Testing Testing. Reliability. Quality control
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description	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.
doi_str_mv	10.1109/PAPCON.2004.1338380
format	conference_proceeding
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issn	0190-2172
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source	IEEE Xplore All Conference Series
subjects	Adaptive filters Applied sciences Connection and protection apparatus Current transformers Discrete event simulation Electrical engineering. Electrical power engineering Exact sciences and technology MATLAB Microprocessors Power harmonic filters Protection Protective relaying Relays Testing Testing. Reliability. Quality control
title	Primary high-current testing of relays with low ratio current transformers
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