Development of fiber-optic current sensing technique and its applications in electric power systems

Abstract

This paper describes the development and applications of a fiber-optic electric current sensing technique with the stable properties and compact, simple, and flexible structure of the sensing device. The special characteristics of the sensors were achieved by use of the special low birefringence fiber as the Faraday-effect sensing element and were also achieved with creation of sensing schemes which matched with the features of the fiber. Making use of the excellent features of the sensing technique, various current monitoring devices and systems were developed and applied practically for the control and maintenance in the electric power facility. In this paper, the design and performance of the sensing devices are introduced first. After that, examples of the application systems practically applied are also introduced, including fault section/point location systems for power transmission cable lines.

Helically twisted photonic crystal fibres

“…Interest in fibre-based current or magnetic field sensors dates back to the 1960s [30]. Such systems are attractive because of their compact size, immunity from electromagnetic interference, fast response time and wide operating temperature range [31][32][33]. They employ the Faraday effect, in which an applied magnetic field rotates the plane of polarization of linearly polarized light propagating along the optical fibre.…”

Rapid and sensitive magnetic field sensor based on photonic crystal fiber with magnetic fluid infiltrated nanoholes

“…Among various kinds of optical fiber based sensors, specialty fibers infiltrated with magnetic fluid has recently attracted scrutiny towards the development of highly sensitive and compact magnetic field sensors. Magnetic field sensors have been extensively used in electric current measurements, in metallurgy, power industry, in biomedical detection, for the oil and gas exploration as well as aviation industry 1 – 3 . The most common methods rely on magneto-transistor, magneto-resistive, fluxgate or the Hall effect to detect and measure magnetic fields 4 – 6 .…”

Rapid And Sensitive Magnetic Field Sensor Based On Photonic Crystal Fiber With Magnetic Fluid Infiltrated Nanoholes

“…Among various kinds of optical fiber based sensors, specialty fibers infiltrated with magnetic fluid has recently attracted scrutiny towards the development of highly sensitive and compact magnetic field sensors. Magnetic field sensors have been extensively used in electric current measurements, in metallurgy, power industry, in biomedical detection, for the oil and gas exploration as well as aviation industry [1][2][3] . The most common methods rely on magneto-transistor, magneto-resistive, fluxgate or the Hall effect to detect and measure magnetic fields [4][5][6] .…”