Fiber optic current sensors (focs) & optical current transformers (oct) the basic principle of focs and octs is to measure polarization rotation due to the faraday effect the faraday effect is the rotation of the polariza. Smart digital optics (sdo), the chosen supplier of rio tinto aluminium, has commissioned a three-phase optical fibre current transformer system (sdoict) in the upgrade of their boyne island smelter - increasing the capacity at australia's largest aluminium smelter. Fiber optic current sensors and optical current transformers version: an01/1 release date: 30 january 2014 application notes the basic principle of fiber optic current sensors (focs) and optical current transformers (octs) is to. In 2005, abb introduced a high-performance fiber-optic current sensor for the measurement of dc up to 600 ka, particularly for use in the electrowinning of metals [1,2] the sensor accuracy is within 01 percent over a range from 1 percent to 120 percent of the rated current and in temperatures from - 40 to + 80 °c.
The latest generation of fiber optic current sensors has been non-conventional current transformers having digital output and fiber optics current sensor. The electronic fiber-optic current transformer excels with a very high stability over a large temperature range, optimal performances over an increased frequency bandwidth, as well as a wide dynamic range and good performance under transient operations. Fiber optics optoelectronics by: mike solus december 14, 2008 today we know that fiber-optics lines are strands of optically pure glass that are as thin as a piece of human hair that can carry digital information very long distances. Optical current transformer is an alternative to the existing conventional current transformers, providing an advanced measurement solution for both metering and protection applications, based on a cutting-edge patented optical sensing technology.
A digital optics fiber current transformer (ct) based on rogowski coils and fiber transmission with excellent insulation to electro-magnetic to replace a conventional open-terminal ferrous core. A fiber optic current sensor (focs) is a current sensor for measuring direct currentby using a single-ended optical fiber around the current conductor that utilizes the magneto-optic effect (faraday effect), focs measures uni- or bidirectional dc currents of up to 600 ka within ±01% of the measured value. Abstract: a digital optics fiber current transformer (ct) based on rogowski coils and fiber transmission with excellent insulation to electro-magnetic to replace a conventional open-terminal ferrous core one for use in high voltage systems is described in this paper the rogowski coil generates a. Focs - fibre-optic current sensor for measuring high dc currents the easy and flexible use characterizes this technical innovation based on the magneto-optic effect (faraday effect) in a single-ended optical fiber around the current conductor, the focs can measure uni- or bidirectional dc currents up to 500 ka with an accuracy of 01 % of the measured value.
Magneto-optic current transformer image source: abb a growing trend in the digital substation is the use of optical current and voltage transducers (sometimes called non-conventional instrument transformers - ncit. Digital instrument transformers ge has developed a range of digital instrument transformer solutions enabling full iec 61850 implementation and contributing to transmission architectures for the smart grid networks of today and tomorrow. In general, the optical current transformer device is more reliable and suitable for new power systems keywords : optical current transformer, fiber optic, current sensor, protection, current transducer. Fiber-optic current and voltage sensors for high-voltage substations k bohnert, p gabus, and h brändle abb switzerland ltd, corporate research, ch-5405 baden-dättwil, switzerland. Digital instrument transformers for ac and dc applications the cosi-ct f 3 optical current sensor is the most flexible, portable optical current transformer sensor available and the.
The paper proposes a novel optics fiber current transformer, which detected the current of grid bus by rogowski coil, then integrated the output of rogowski coil, fulfilled analog to digital conversion and followed electro-optic transformation of the detected current on high voltage side. The digital current and voltage measurements from the optical transducers were converted by the signal processing of the interface module to a protocol compatible with the secondary line protection relay rel 511 supplied by abb.
Sdo oct | optical current transformer 3 passive optical network the sdo oct provides a digital measurement solution for metering and with an embedded fiber optic. Current data using optical fibre the paper describes the analog relays or optical current transformers (oct) conversion of electrical digital data to. An optical current sensor has been designed and tested this device, which employs the faraday effect in optical fibre to measure electrical current, is intended to be applied in power system protection equipment it is regarded as a potential replacement for the iron cored current transformer in certain applications. Fiber-optic current sensor (focs) is a spin off from a sensor developed for high-voltage substations and opens totally new perspectives in the field of high current dc measurement fig 1: faraday effect.
Abstract: a digital optical fiber current transformer (oct) based on rogowski coil and optical fiber transmission for use in high voltage systems is described in this paper the technologies of signal sampling, processing and communication for the optical current transformer are introduced. Non-conventional current transformer enabling digital hv substations and smart grids with an optical iec 61850-9-2le ethernet output beside inductive current transformers, oil or sf6 insulated, abb has developed since 1990s optical current sensors, based on the faraday effect principle, whereby light is used to deduce the precise magnitude of current that is creating the magnetic field.
Magneto optic current transformer technology (moct) the ground loop into the digital systems magneto-optical current of fibre optics for communications. Moct-p optical current transformer system 725-800 kv systems, 50/60 hz application the magneto-optic current transformer for protection (moct-p) is a passive optical current transducer which uses light to accurately measure current on high voltage systems. Seminar report on digital optics fibre current transformer with c t power supply department of electrical and electronics engineering abstract a digital optics fiber current transformer (ct) based on rogowski coils and fiber transmission with excellent insulation to electro-magnetic to replace a conventional open-terminal ferrous core one for.