Abstract
The growth in the capacity of electric power system creates a demand for the protection of relaying systems. Optical current transducers—OCT that are mainly made up of single mode optical fibers which are subjected to Faraday rotation are used as a replacement for electromagnetic transducers due to their immunity to electromagnetic interference. However, the principal parameter in this system, the sensitivity to magnetic fields or current, depends on the Verdet constant, which is low in the case of optical fibers. However, the optical path length can be increased to compensate for it by winding the fiber around a current carrying element a large number of turns. In this work, we study a current sensor, which is made up of a conductor coil with a fiber inside, thus increasing sensitivity. We study the effect of the inhomogeneity of the magnetic field induced by the current on the sensitivity of the optical fiber sensor.
Highlights
The protection of relaying systems is a prominent task for optical current sensors
Optical current transducers—OCT that are mainly made up of single mode optical fibers which are subjected to Faraday rotation are used as a replacement for electromagnetic transducers due to their immunity to electromagnetic interference
We study the effect of the inhomogeneity of the magnetic field induced by the current on the sensitivity of the optical fiber sensor
Summary
The protection of relaying systems is a prominent task for optical current sensors. These sensors can recognize sudden failures, such as surges, and identify the failure parts in the power systems. The magneto-optical sensor is based on the Faraday rotation effect [2], which states that the polarization of light waves is rotated with the propagation of the light along (or opposite to) a magnetic field inside some material. This rotation depends on the Verdet constant which a property of the material as well as the strength of the magnetic field and the optical path. After passing through the coil, a relative phase difference between two circular polarization components is generated, which results in the rotation of the linear polarization angle in proportion to the enclosed current and the number of fiber turns.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
