Fiber current transformer is a novel power equipment, because of the adoption of Rogowski coil as
sensor head, compared with traditional current transformers, it has the unexampled virtues[1,2], such as
simple credible insulation, non magnetism saturation, non second broken circuit hazard, strong antijamming
electromagnetism, small cubage, light weight, convenient installation and shipping.
The research difficulties of fiber current transformer are power supply for high voltage portion and low
power dissipation of high voltage signal process circuit. The reported power supply schemes were mainly
power-line energisation and laser power supply[3]. In this paper, the principle of fiber current transformer
is first introduced, then the Rogowski coil and the high voltage signal process circuits were introduced.
On the base of this, the power supply schemes were analyzed and compared, then the novel power supply
scheme of this system was presented