Design and validation of broadband calibration system for fiber-optical current transformers

With the rapid development of the energy system, new requirements are put forward for the current measurement equipment, including fiber-optical current transformer (FOCT), which is a vital instrument for measuring the current of high voltage direct current (HVDC) system. Nowadays, the broadband measurement performance of FOCT requires higher technical indicators, yet the existing calibration system of FOCT cannot meet the actual engineering needs. This paper developed a broadband calibration system for FOCT, which can accurately verify the broadband performance of FOCT in the frequency range from 50Hz to 2500 Hz. The impedance of the secondary circuit of the lifter in the calibration system is calculated; the power supply selection requirements of the FOCT calibration system were proposed. The broadband calibration of FOCT prototype with rated current 1000A was calibrated in the frequency range from 50Hz to 2500Hz. Further, the validity of the system was verified.

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