Affiliations: [a] Department of Electrical Engineering, Tsinghua University, 100084 Beijing, China | [b] Beijing Internet Aided Engineering Ltd, 100083 Beijing, China | [c] China Electric Power Research Institute, 430074 Wuhan, Hubei, China | [d] National Institute of Metrology, 100029 Beijing, China | [e] School of Engineering and Computing Sciences, Durham University, Durham, UK
Correspondence:
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Corresponding author: Wei Zhao, West Main Building 1-311, Tsinghua University, 100084 Beijing, China. Tel.: +86 10 62772049; Fax: +86 10 62783057; E-mail: [email protected].
Abstract: Heavy current transformers (HCTs) for large generators are intensively interfered by the stray magnetic field produced by heavy adjacent currents, and therefore, anti-interference testing is a crucial process to assure the robustness of HCT products. However, the generation of the interference involves multiphase heavy currents, which are difficult to produce in testing environments, and equivalent testing coils have become an emerging solution to the testing. In this paper, an improved parameter determination algorithm is proposed for the traditional two-segment testing coil configuration, and furthermore, a novel multi-segment testing coil configuration is proposed for better equivalence of the multiphase interference. The effectiveness of the two configurations are thoroughly analyzed by FEM-based simulations as well as physical experiments.
Keywords: Electromagnetic interference, heavy current transformers, partial coil, magnetic shielding, testing
