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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Dumam Roman Jackson1 and Choong-Koo Chang2
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DOI:10.17265/1934-8975/2017.10.008
Affiliation(s)
1. Electrical Lab, Nuclear Power Plant Engineering Department, KEPCO International Nuclear Graduate School, 658-91 Haemaji-ro, Seosang-myeon, Ulus-gun, Ulsan 45014, Republic of Korea
2. The Dean of Academic Affairs (Professor), Nuclear Power Plant Engineering Department, KEPCO International Nuclear Graduate School, 658-91 Haemaji-ro, Seosang-myeon, Ulus-gun, Ulsan 45014, Republic of Korea
ABSTRACT
This paper discusses a
preferable solution to mitigate the CT (current transformer) saturation
problem, and at same time, reduce the accuracy errors when considering the
selection of CTs for installation on the medium voltage switchgear of a nuclear
power plant. This consideration is important for both measurement and
protection functions of the digital protective relays. This is a study to
ascertain the best options for a suitable solution to prevent CT saturation in
relations to its protective capabilities during short circuit fault without
compromising the CT accuracy class during normal operation of the system, while
ensuring its conformity to the design requirement is within limit. The advantages of current transformers have proven not only to be reliable and safe, but also
are of easy handling, reduction of the cost and components on the MV (medium
voltage) switchgear. The purpose of this research is to identify best approach
to resolve the existing problems in the current protection system. With the view of LPCT (low power current transformer) which has been newly
constructed by few manufacturers to provide good protection and a wide range of
measuring function without errors, some other solutions will be considered in this
research.
KEYWORDS
CT, CT saturation, accuracy class, metering CT, protection CT, MV switchgear, short circuit fault current, knee voltage.
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