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Design and simulation of a new model for air‐gapped current transformers
Author(s) -
Wu Yahui,
Dong Xinzhou,
Mirsaeidi Sohrab
Publication year - 2018
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.22675
Subject(s) - salient , transformer , matlab , computer science , current transformer , electronic engineering , air gap (plumbing) , remanence , software , electrical engineering , engineering , magnetization , magnetic field , physics , materials science , voltage , artificial intelligence , programming language , quantum mechanics , composite material , operating system
Current transformers (CTs) with air gaps in their iron cores are mainly applied in power systems to prevent saturation‐caused malfunctions of current‐based relays. However, performing reliable power system studies necessitates accurate modeling of air‐gapped CTs. This paper presents a new model for air‐gapped CTs based on the Preisach Theory, which has the ability to represent the role of air gaps of different lengths in the performance of a CT. The salient feature of this study in comparison with other published works is that it does not require measuring the magnetization curves of the air‐gapped core, which is often difficult. In order to validate the effectiveness of the proposed method, several simulations have been performed using PSCAD/EMTDC and MATLAB software packages. Simulation results indicate that the proposed model can accurately represent the characteristics of saturation as well as remanence of air‐gapped CTs. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.