Simulation and Analysis for Current Transformers with DC Bias and Remnant Flux

Abstract:

The transfer characteristics of current transformers (CT) change due to DC bias, which directly impacts the accuracy of measurement and power metering. Based on equivalent circuit models and core magnetizing characteristic, qualitatively analysis current transformer saturation increase errors of CT. Transfer errors under DC bias and remnant flux are also obtained based on J-A model of CT in PSCAD/EMTDC and full-wave Fourier algorithm to show that the ratio error and phase displacement increase with the DC bias. Based on FFT spectrum analysis to identify remnant flux and DC bias provides scientific basis for error compensation of CT.

• Periodical: Advanced Materials Research (Volumes 765-767)
• Pages: 2430-2434
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.765-767.2430
• Online since: September 2013
• Authors: Xiao Qian Tian, Bao Shu Li, Lu Shen
• Keywords: Current Transformer (CT), DC Bias, Error, Identification, Remnant Flux

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