Development of a Compensation Scheme for a Measurement Voltage Transformer Using the Hysteresis Characteristics of a Core

Hyewon Lee, Jong-Min Park, Kyeon Hur and Yong Cheol Kang
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Hyewon Lee: Department of Electrical Engineering and Wind Energy Grid-Adaptive Technology Research Centre, Chonbuk National University, Chonju 561-756, Korea
Jong-Min Park: YPP Corporation, Seoul 153-023, Korea
Kyeon Hur: Department of Electrical Engineering, Yonsei University, Seoul 120-752, Korea
Yong Cheol Kang: Department of Electrical Engineering, Wind Energy Grid-Adaptive Technology Research Centre and Smart Grid Research Centre, Chonbuk National University, Chonju 561-756, Korea

Energies, 2015, vol. 8, issue 4, 1-13

Abstract: This paper describes the design, evaluation, and implementation of a compensation scheme for a measurement voltage transformer (VT) using the hysteresis characteristics of the core. The error of a VT is caused by the primary winding voltage and secondary winding voltage. The latter depends on the secondary current, whereas the former depends on the primary current, which is an aggregate of the exciting and secondary currents. The secondary current is obtained directly from the secondary voltage and is used to obtain the voltage across the secondary winding. For the primary current, the exciting current is decomposed into two components: core-loss and magnetizing currents. The magnetizing current is obtained by the flux-magnetizing current curve instead of the hysteresis loop to minimize the required loops for compensation. The core-loss current is obtained by dividing the primary induced voltage by the core-loss resistance. Finally, the estimated voltages across the primary and secondary windings are added to the measured secondary voltage for compensation. The scheme can significantly improve the accuracy of a VT. The results of the performance of compensator are shown in the experimental test. The accuracy of the measurement VT improves from 1.0C class to 0.1C class. The scheme can help to significantly reduce the required core cross section of a measurement VT in an electrical energy system.

Keywords: voltage transformer; compensation scheme; hysteresis characteristics; iron core (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
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