A new method for calibrating standard current transformers up to 20 kA

Autor:	Jae Kap Jung, Jeon Hong Kang, Myungsoo Kim, Sang Hwa Lee
Rok vydání:	2007
Předmět:	Current range Traceability business.industry Applied Mathematics Acoustics Electrical engineering Current transformer Phase displacement Range (statistics) Equivalent circuit Current (fluid) National standard business Instrumentation Engineering (miscellaneous) Mathematics
Zdroj:	Measurement Science and Technology. 18:3309-3315
ISSN:	1361-6501 0957-0233
Popis:	We have developed a method to obtain the ratio error and phase displacement of a single-stage current transformer (CT) by measuring four parameters in a CT equivalent circuit. The method was applied to CTs under test with a primary current in the range 10–20 000 A and a secondary current of 5 A. By determining the errors of the CTs under test using this method, the ratio error and phase displacement of the standard CTs used as a reference in a CT test system could be obtained. This implies the establishment of a traceability chain of a national standard for CTs. The ratio error and phase displacement of the standard CTs obtained in this study are consistent with those measured at the Physikalisch-Technische Bundesanstalt in Germany using the same standard CTs within an expanded uncertainty (k = 2) in the overall primary current range investigated.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ed248e3b369bb3d84a42abf21110a04e https://doi.org/10.1088/0957-0233/18/11/007 Zobrazit plný text záznamu