Optimization Design Study of a Full-Range Charged Calibration Device for a Low-Voltage Current Transformer

Can Ding, Tingting Feng (), Yaolong Bai and Yiji Shi
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Can Ding: College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China
Tingting Feng: College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China
Yaolong Bai: College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China
Yiji Shi: College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China

Energies, 2024, vol. 17, issue 11, 1-13

Abstract: According to standards, the harmonic content should be less than 5% at the time of calibration, while the calibration index proposed in this paper stipulates that the primary current amplitude of 1%~120% of the full range of the accuracy level reaches 0.05 S level. In view of the above problems and indexes, this paper adopts the active regulation technology of primary current; firstly, the harmonics of primary current are extracted, and then the opposite harmonic currents are injected by the penetrating wire to offset the harmonics, and finally, charged calibration is carried out. The inductive current transformer charged calibration device was first designed, and the particle swarm algorithm was used to optimize the offset performance of the key link of the background current offset suppression. The transfer function of the offset loop was derived, and it was theoretically analyzed that it can meet the offset requirements up to the 200th harmonic. The results show that the optimized calibration method can realize the full-range calibration of low-voltage inductive current transformers under charged conditions by making a prototype of the device and constructing a test circuit for experiments, and measuring the data and analyzing them.

Keywords: low-voltage current transformer; error calibration with electricity; transfer function; PSO; higher harmonics (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: 2024
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