NDLI: Eccentric Bus-Bar Testing Method of the Shielding Effect of a Heavy Current Transformer With Shielding Coils

Content Provider	IEEE Xplore Digital Library
Author	Kaifeng Qu Wei Zhao Bo Jiang Haiming Shao Zhifang Liu
Copyright Year	1963
Abstract	To equivalently and effectively test the shielding effect of a heavy current transformer (HCT) with shielding coils in a laboratory, an eccentric bus-bar testing method has been used to simultaneously simulate the effect of primary bus bar and adjacent bus bar since 1970s. However, there has not yet been an effective way to determine the crucial parameters, particularly the eccentric distance, which means the distance from the center of an eccentric bus bar to the center of an HCT. This paper presents several analytical formulas to determine the eccentric distance and relevant parameters in the testing method, which may overcome the difficulty at present. The formulas are derived out from a magnetic circuit model and further verified by a finite-element method. Numerical results show that these formulas are effective and easy to use in the testing of an HCT. Most importantly, the source of an equivalent relative error has been also investigated in detail. Furthermore, if the eccentric current, which should be equal to the original primary current, is still too high to be reproduced in a laboratory, auxiliary and compensating windings could be adopted to reduce it.
Sponsorship	IEEE Instrumentation and Measurement Society Bureau international des poids et mesures IEEE International Bureau of Weights and Measures (BIPM) URSI NBS Agency Ind. Sci. & Technol., Min. Int. Trade & Ind. Sci. Council Japan International Union of Pure and Applied Physics (IUPAP) NIST NRCC National Conference of Standards Laboratories (NCSL) Allen Osborne Associates Andeen-Hagerling, Inc. Ballantine Lab. Inc. Clarke-Hess Communications Research Corp. Fluke Corporation Guildline Instruments Hewlett-Packard Co. Julie Res. Lab. Inc. Keithley Instruments, Inc. Measurements International Ltd. Canada QuadTech Inc. Quantum Design Inc. Rotek Instrum. Corp. Tegam Inc. Tektronix Inc
Starting Page	84
Ending Page	92
Page Count	9
File Size	1592212
File Format	PDF
ISSN	00189456
Volume Number	61
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic cores Testing Iron Bars Magnetic shielding Magnetic noise Atmospheric modeling testing Eccentric bus bar eccentric distance electromagnetic interference heavy current transformer (HCT) shielding coils stray flux
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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