A comparative study for current transformer dimensioning in overcurrent relay

Bakar, Ab Halim Abu and Zali, S.M. and Tan, Chia Kwang and Illias, Hazlee Azil and Mokhlis, Hazlie (2016) A comparative study for current transformer dimensioning in overcurrent relay. IEEJ Transactions on Electrical and Electronic Engineering, 11 (S1). S43-S48. ISSN 1931-4973, DOI https://doi.org/10.1002/tee.22235.

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Official URL: http://dx.doi.org/10.1002/tee.22235


Dimensioning a current transformer (CT) is one of the most important tasks during the substation planning process. The installation of a correctly specified CT will ensure the integrity of the protection scheme. However, some parameters required for dimensioning a CT can be obtained only after the CT is installed in the substation. Because of the conflicting requirements, utility companies commonly adopt a simplified approach in compensating for the missing parameters. Two other methods for dimensioning CT under the given constraint during the planning stage have also been proposed by several authors. In view of the availability of the three methods of approximating CT specifications, this paper will conduct a comparative study to evaluate their accuracies. The approximated specifications of the CT during the planning stage are compared against those measured from a practical substation. Based on the findings from the comparative studies, the most reliable approach for CT dimensioning during the planning stage is proposed.

Item Type: Article
Funders: Ministry of Science, Technology and Innovation, Malaysia: (eScience Fund: SF012-2014), Centre of Research Grant Management, University of Malaya: (UMRG fund: RG299-14AFR)
Uncontrolled Keywords: Current transformer; Knee point voltage; Saturation factor; Secondary time constant
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 20 Oct 2017 03:15
Last Modified: 10 Oct 2019 02:38
URI: http://eprints.um.edu.my/id/eprint/18024

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