title: An accurate continuous calibration system for high voltage current transformer.
abstract: A continuous calibration system for high voltage current transformers is presented in this paper. The sensor of this system is based on a kind of electronic instrument current transformer, which is a clamp-shape air core coil. This system uses an optical fiber transmission system for its signal transmission and power supply. Finally the digital integrator and fourth-order convolution window algorithm as error calculation methods are realized by the virtual instrument with a personal computer. It is found that this system can calibrate a high voltage current transformer while energized, which means avoiding a long calibrating period in the power system and the loss of power metering expense. At the same time, it has a wide dynamic range and frequency band, and it can achieve a high accuracy measurement in a complex electromagnetic field environment. The experimental results and the on-site operation results presented in the last part of the paper, prove that it can reach the 0.05 accuracy class and is easy to operate on site.
authors.affiliation: College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, Hubei Province, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Tong
authors.forename: Bin Hong
authors.initials: BH
authors.lastname: Li