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Establishment of National Standard System for 20.000 A Current Transformer  

Jung, Jae-Kap (한국표준과학연구원)
Lee, Sang-Hwa (한국표준과학연구원)
Kang, Jean-Hong (한국표준과학연구원)
Kim, Myung-Soo (한국표준과학연구원)
Kim, Yoon-Hyoung (충남대학교 전기공학과)
Han, Sang-Gil (충남대학교 전기공학과)
Han, Sang-Ok (충남대학교 전기공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers P / v.57, no.1, 2008 , pp. 6-13 More about this Journal
Abstract
National standard system for calibrating current transformer(CT) up to primary current of 20,000A have been established. The system consists of 20,000 A AC high current source, CT comparator, standard CT, CT under test and CT burden. An AC high current is applied tn the primary windings of both the standard CT and the CT under test, and then the CT comparator measures the ratio error and the phase displacement by comparing the secondary currents of the two transformers. As a validity check for 20,000 A CT calibration system, the comparison with the two national standard institutes(NMIs) has been performed using same CTs. The comparison results of the CTs are consistent with those measured at two NMIs within 0.004 % for ratio error and 0.1 min for phase displacement in the primary current ranges of Ip = 10 - 20,000 A with a secondary current of Is = 5 A.
Keywords
National standard system; Current transformer; CT comparator; Ratio error; Phase displacement; CT burden;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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