CONTRIBUTION TO EXPERIMENTAL INVESTIGATION OF FITTING OF CALIBRATION CURVES OF CURRENT TRANSFORMERS
Keywords:
curve fitting, calibration, accuracy class
Abstract
The paper experimentally investigates the problem of fitting calibration curves of current transformers (CT). An efficient fitting algorithm enables precise and accurate electronic online correction of CT errors and thus effective improvement of their accuracy class. The paper presents the results of one such algorithm which allows correcting the transformers current ratio error to the level of 0.004%. The base are 8 key calibration points in the range 1% ‑ 200% of the CT’s nominal primary current.
References
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Emanuel, A E, Orr, J A. (2007). Current Harmonics Measurement by Means of Current Transformers. IEEE Transactions On Power Delivery, Vol. 22, No. 3, July 2007
Ling G, Akil N, Tao Zh. (2020). Constructing Least-Squares Polynomial Approximations. DOI. 10.1137/18M1234151. SIAM REVIEW Vol. 62, No. 2, pp. 483–508, Society for Industrial and Applied Mathematics, 2020
Naumovic Vukovic, Dragana, Antic, R., Vujicic, V., Pejic, D. (2009). Application of the Protective Current Transformers in Measurement Systems for Energy Management Purposes. EUROCON 2019 - 18th International Conference on Smart Technologies, 2019, 8861553
Emanuel, A E, Orr, J A. (2007). Current Harmonics Measurement by Means of Current Transformers. IEEE Transactions On Power Delivery, Vol. 22, No. 3, July 2007
Ling G, Akil N, Tao Zh. (2020). Constructing Least-Squares Polynomial Approximations. DOI. 10.1137/18M1234151. SIAM REVIEW Vol. 62, No. 2, pp. 483–508, Society for Industrial and Applied Mathematics, 2020
Naumovic Vukovic, Dragana, Antic, R., Vujicic, V., Pejic, D. (2009). Application of the Protective Current Transformers in Measurement Systems for Energy Management Purposes. EUROCON 2019 - 18th International Conference on Smart Technologies, 2019, 8861553
Published
2021/02/18
Section
Papers