Abstract
In this paper we demonstrate the design of a low-cost optical current sensor. The sensor principle is the Faraday rotation of a light beam through a magneto-optical material, SF2, when a magnetic field is present. The prototype has a high sensitivity and a high linearity for currents ranging from 0 up to 800 A. The error of the optical fibre sensor is smaller than 1% for electric currents over 175 A.
Highlights
The new uses of the electrical network, as well as the increasing demand for greater quality of service (QoS), require providing the network with “intelligence”
The optical head of the current sensor was attached to the conductor using a dual-side adhesive tape
The testing device was connected in series to the conductor using means provided by the manufacturer
Summary
The new uses of the electrical network, as well as the increasing demand for greater quality of service (QoS), require providing the network with “intelligence”. Optical technology is an ideal candidate for this, without the safety requirements (disconnectors, lightning rods, etc.) of conventional sensors. In comparison with conventional transformers, optical fibre current sensors (OFCS) are compact and lightweight, easy to install, immune to electromagnetic noise, and they offer a wide measurement range and long distance signal transmission [5,6,7,8]. A number of OFCS have been shown to be feasible. They have good reliability and sensitivity, the price is high. This disadvantage can be overcome with plastic optical fibre (POF)
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