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Sensors 2017, 17(6), 1218;

Modelling and Optimization of Four-Segment Shielding Coils of Current Transformers

Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
School of Engineering and Computing Sciences, Durham University, Durham DH1 3LE, UK
Beijing Internet Based Engineering Co., Ltd., Beijing 100083, China
Institute of Instrumentation and Measurement, State Grid Electric Power Research Institute, Wuhan 430074, China
Division of Electricity and Magnetism, National Institute of Metrology, Beijing 100029, China
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 22 March 2017 / Revised: 25 April 2017 / Accepted: 22 May 2017 / Published: 26 May 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [3101 KB, uploaded 26 May 2017]   |  


Applying shielding coils is a practical way to protect current transformers (CTs) for large-capacity generators from the intensive magnetic interference produced by adjacent bus-bars. The aim of this study is to build a simple analytical model for the shielding coils, from which the optimization of the shielding coils can be calculated effectively. Based on an existing stray flux model, a new analytical model for the leakage flux of partial coils is presented, and finite element method-based simulations are carried out to develop empirical equations for the core-pickup factors of the models. Using the flux models, a model of the common four-segment shielding coils is derived. Furthermore, a theoretical analysis is carried out on the optimal performance of the four-segment shielding coils in a typical six-bus-bars scenario. It turns out that the “all parallel” shielding coils with a 45° starting position have the best shielding performance, whereas the “separated loop” shielding coils with a 0° starting position feature the lowest heating value. Physical experiments were performed, which verified all the models and the conclusions proposed in the paper. In addition, for shielding coils with other than the four-segment configuration, the analysis process will generally be the same. View Full-Text
Keywords: current transformers; current measurement; electromagnetic interference; magnetic flux leakage; magnetic shielding current transformers; current measurement; electromagnetic interference; magnetic flux leakage; magnetic shielding

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gao, Y.; Zhao, W.; Wang, Q.; Qu, K.; Li, H.; Shao, H.; Huang, S. Modelling and Optimization of Four-Segment Shielding Coils of Current Transformers. Sensors 2017, 17, 1218.

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