Increasing the Reliablity of the Measuring Circuits of Protection Relays

The primary current of a current transformer (CT) is calculated on the basis of the characteristics of the magnetization and the measured secondary current of the CT. This makes it possible to extend the linear range of operation of the measuring circuit of the protection and thereby increase the pr...

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Bibliographic Details
Published inPower technology and engineering Vol. 50; no. 1; pp. 87 - 92
Main Authors Vanin, V. K., Ambrosovskaya, T. D., Popov, M. G., Popov, S. O.
Format Journal Article
LanguageEnglish
Published New York Springer US 01.05.2016
Subjects
Electrical Machines and Networks
Energy
Energy Systems
Foundations
Geoengineering
Hydraulics
Power Electronics
Renewable and Green Energy
protection relay
magnetization current
reset primary current
current transformer
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Summary:The primary current of a current transformer (CT) is calculated on the basis of the characteristics of the magnetization and the measured secondary current of the CT. This makes it possible to extend the linear range of operation of the measuring circuit of the protection and thereby increase the protection stability. The mathematical model of a current transformer and the reset algorithm for the primary and magnetization currents are described and the operation of the algorithm in different transient processes is analyzed.
ISSN:1570-145X
1570-1468
DOI:10.1007/s10749-016-0665-z