Voltage and current sensors are the eyes and ears of the electric power system. The gridadvisor insight optical mediumvoltage and current sensor is a direct replacement for standard potential transformers and current transformers. Distance package dimensions in millimeters, tcrt5000 0. Fiber optic current sensors and optical current transformers. An interferometric current sensor based on optical fiber micro wires mohammad belal, zhangqi song, yongming jung, gilberto brambilla, and trevor newson opt. This sensor type is highly flexible and can measure electric current traveling through large structures. Fiber optic current sensors focs are resistant to effects from magnetic or electrical field interferences.
Optical current transformers based on optical fibre sensors are now being developed worldwide 14. Current transformers cts and voltage transformers vts are used extensively in substations for measuring and monitoring voltage and current. The faraday effect is the rotation of the polarization state of light. Introduction optical current sensors ocs offer several advantages when compared to hall effect and other conventional current sensors. Application of optical sensors vishay intertechnology. By forming closed loops around aircraft structures, the enclosed current can be measured. Pdf optical current sensors eliminate ct saturation. Optical current sensors are achieving increased acceptance and use in high voltage substations due to their superior accuracy, bandwidth, dynamic range and inherent isolation. Abb fiberoptic current sensor focs for high dc currents. Optical voltage and current sensor systems sensor electronics and merging unit optional cable management box cabling system optical transformers secondary devices e. The fiberoptic current sensor is based on faraday rotation effect and can overcome most limitations of traditional current sensors, making accurate direct aircraft lightning measurement feasible and affordable. The constructed optoelectronic current sensor was tested for detection of current with intensity of the order of 200 a, with an accuracy of a few percent. This brochure discusses eaton s gridadvisor insight re120 optical elbow insert voltage sensor and rec220 optical elbow insert voltage with optical ring current sensor. Jun 01, 2017 optical voltage and current sensor systems sensor electronics and merging unit optional cable management box cabling system optical transformers secondary devices e.
Current sensor free standing focsfs offers significant improvements over conventional cts and facilitates direct introduction of digital process bus in hv substations. Fiberoptic sensor for aircraft lightning current measurement. Please view our large selection of optical switches below. The fiber sensor can be either an intrinsic oneif the modulation takes place directly in the fiberor extrinsic, if the modulation is performed by some external transducer as depicted in fig. Dissertation, faculty of technology, university of oulu, 2000, abstract and pdf, isbn 9514257804. There is a wide variety of current sensors to monitor alternating or direct the current and its measurement is required in many applications be it in industrial, automotive, or household fields. Optical proximity sensors are available at mouser electronics. Abb fiberoptic current sensors focs for the measurement of high dc currents. The minimum detectable optical phase shift is a few mradohz. There are a wide variety of sensors, and each sensor is suitable for a specific current range and environmental condition. Optical switches are available at mouser electronics from industry leading manufacturers. Thus the term current sensor is somewhat extended in this work also covering magnetic field sensors as potential current sensors.
Grid sensor power sensor current and voltage eaton. Device technology and applications in spectroscopy. Abb has also developed since 1990s optical current sensors, based on the faraday effect principle, whereby light is used to deduce the precise magnitude of. This type of sensor has been under development by the power indust ry for decades. The control signal varies linearly with the applied current and also serves as sensor output. After that, in the 1980s, a method using optical fiber as the faraday sensor element optical fiber current sensor is proposed 2. Integrated compact optical current sensors with high sensitivity. Optical sensors are used for contactless detection, counting or positioning of parts. Explore optical technology in current measurement with free download of seminar report and ppt in pdf and doc format. Fibreoptic dc current sensor for the electrowinning industry english pdf.
Development of fiberoptic current sensing technique and its applications in electric power systems. Optical fiber current sensor ocs which utilizes the faraday effect. Request pdf optical current sensor for dc measurement a highaccuracy optical current transformer optical ct for dc current measurement has been developed. The basic principle of fiber optic current sensors focs and optical current transformers octs is to measure polarization rotation due to the faraday effect. With a single loop of fiber a phase shift of 5 mrad corresponds to a current of about 1 a. Then, research and development of the method has been carried out at many institutes for a long time. The principles of optical and optical fiber current sensor technology have been known for some considerable time, and some of the earliest papers on optical. Fundamentals of current sensor sensing concepts and applications. This new design exceeds magnetic ct technology in safety of operation, current measurement and frequency response, footprintweight savings and environmental friendliness. Pdf the intrinsic advantages of optical sensor technology are very appealing for high voltage applications and can become a valuable asset in a new. Vishay semiconductors reflective optical sensor with transistor output fig.
The sensor discussed in this paper is optical fiber based. A specific area where optical current sensors outperform. Pdf an opticalfiber sensor based on faraday effect is developed for measuring total lightning electric current. Fiber optic sensors fundamentals and applications, fourth edition, 2014 available at. An optical sensor converts light rays into an electronic signal. And then the main advantages and disadvantages of several. The current sensor is disturbing as it is an incorporation of some of the sensors, which may cause system performance. Optical measurement of currents in power converters. Practically, the upper border of the current detection by means of this sensor is much higher. Pdf a fiberoptic current sensor for lightning measurement.
The easy and flexible use characterizes this technical innovation. Figure 3 shows the relative collector current versus the distance of the material from the sensor for the tcrt. Application of optical sensors vishay semiconductors operating range and peak operating distance the phototransistor collector current is also dependent on the distance of the reflecting material from the sensor. Optical current transducers for electrical power systems. The following investigation is divided into two groups. These measurements form an essential part of operations and protection functions in the substation, and thus reliability and accuracy of voltage and current transformers vcts is important. Aug 31, 2016 optical fiber current sensor ofcs based on faraday magnetooptic effect has many advantages of immunity against electromagnetic interference, high sensitivity and wide dynamic range. Department of optoelectronics, silesian university of technology, 2 krzywoustego st. The goal of this work has been the design and development of a lowcost optical current sensor, including its modular electronics. The purpose of an optical sensor is to measure a physical quantity of light and, depending on the type of sensor, then translates it into a form that is readable by an integrated measuring device. Waveform measurement of impulse current such as lightning current, superconductive current measurement.
Once deemed specialized devices intended for novel applications, optical sensors have risen to a performance level exceeding conventional magnetic devices. Focs are able to replace existing solutions based on the hall effect, which tend to be bulky and heavy. The effect in an optical fiber is illustrated in fig. Fiber optic current sensors kristian bjork svensson sp sveriges tekniska forskningsinstitut brinellgatan 4 department of microtechnology and nanoscience. Fiberoptic current sensor for the electrochemical industry. Optical fibre current sensor for electrical power engineering. Based on the magnetooptic effect faraday effect in a singleended optical fiber around the current conductor, the focs can measure uni or bidirectional dc currents up to 500 ka with an accuracy of 0. Optical technology in current measurement seminar report. Ac100v250v, 50hz or 60hz 5ka rms 10hz10khz jec12011ps class at 1ka, 50hz 050. By using a singleended optical fiber around the current conductor that utilizes the magnetooptic effect faraday effect, focs measures uni or bidirectional dc currents of up to 600 ka within 0. The mixedtype optical fiber current sensor, using new magnetooptic material and having a miniature sensing head, has met the current transformer standards of class 0.
High voltage products instrument transformers fiber. Development of fiberoptic current sensing technique and. Brief overview of optical current and voltage sensors. Optical current sensor for dc measurement request pdf. The same aluminum casting design covers all voltage ratings and all currents ratings. 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. Because of the all optical sensor design, there are no conductive materials used for the measurement of both voltage and current. Focs fibreoptic current sensor for measuring high dc currents. A fiberoptic current sensor for lightning measurement. Pdf 114 kb, 12102018 gridadvisor insight rg235 optical line hanging voltage and current sensor product aid. The paper presents the experimental results of the investigations of optical. Positionsensitive devices and sensor systems for optical tracking and displacement sensing application.
The intrinsic advantages of optical sensor technology are very appealing for high voltage applications and can become a valuable asset in a new. Optical current sensors ocss show several important features when compared with conventional current transformers cts, such as their having highly effective isolation from high line potentials offered by the dielectric nature of the optical fibers, freedom from the saturation effect which may be observed in conventional transformers, the. Different types of optical sensors and applications. Consequently, they are ideal for the measurement of electrical currents and high voltages in electrical power stations. The design allows the installation of a second optical sensor head, in order to have an extended redundancy level for the system. A fiberoptic current sensor focs is a current sensor for measuring direct current. Pdf optical current sensors for high power systems. Design and development of a lowcost optical current sensor. Gridadvisor insight rg235 optical mediumvoltage and current.