It uses the rotation of the plane of polarization by a magnetic. Aug 01, 2011 in other devices, this operation is carried out by passing a current into a wire conductor so as to produce a magnetic field or measuring current induced by a magnetic field to sense the magnetic field strength. By applying faradays principle this transducer provides an easier and more accurate way of current measurements. The basic principle of fiber optic current sensors focs and optical current transformers octs is to measure polarization rotation due to the faraday effect. Oct 10, 2015 diamagnetic tellurite glass and fiber based magneto optical current transducer.
We propose a novel structure of the sensor head for optical current transducer oct, which consists of a bulk magneto optic glass with graded index grin and a ferromagnetic ring acting as. Cr magneticscurrent transducers, voltage transducers, ac. Magnetic transducer article about magnetic transducer by. 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. Optical current transformeroct is defined as sensors that directly or indirectly use optical sensing methods to measure electric currents. First, a theoretical analysis was performed on the effect of temperature on the performance of the sensing element of paramagnetic rare earthdoped magneto optical glass material that can be used in an optical current transducer application.
To measure currents power stations and substations conventionally employ inductive type current transformers with core and windings. The existence of an interaction between light and sound was discovered by brillouin in the. Hall effect sensor the hall effect may be used to measure magnetic fields and hence in contactfree current measurement, but its commonest application is in motion sensors where a fixed. Magnetooptical electriccurrent sensor with enhanced. Magnetooptical current sensors of high bandwidth article in sensors and actuators a physical 811. Moct technology provides solution to many of the problems of conventional current transformer. A novel magnetic field fiber sensor based on magnetic fluid is proposed. Sep 01, 2015 first, a theoretical analysis was performed on the effect of temperature on the performance of the sensing element of paramagnetic rare earthdoped magneto optical glass material that can be used in an optical current transducer application. Download the seminar report for magneto optic current. Download limit exceeded you have exceeded your daily download allowance. The paper presents the experimental results of the investigations of optical. Pdf a clampon optical current sensor prototype for metering and protection applications in high power systems was developed and characterized. Focs fibreoptic current sensor for measuring high dc currents. Download moct ppt for seminar in electrical engineering.
In an conventional current transformers, there is a chance of saturation of magnetic field under high current, complicated insulation and cooling structure, a chance of electro magnetic interference. Contents introduction ct purpose and demerits moct principle. The intrinsic advantages of optical sensor technology are very appealing for high voltage applications and can become a valuable asset in a new generation of smart grids. Osa magnetooptical fiber sensor based on magnetic fluid. Pdf optical current transducers octs have clear advantages over. We present to the reader the mathematical formalism used to describe this phenomena as well as the common. Pdf optical current sensors eliminate ct saturation.
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. The moct system is suitable for outdoor application and has an accurate metering current range from less than 5 a to 3150 a using the same sensor. The output interference spectrum is shifted as the change of the applied magnetic field. Conference proceedings papers presentations journals. Current transformers cts and voltage transformers vts are used extensively in substations for measuring and monitoring voltage and current. Moct optical current transformer system for metering 72. A device for transforming mechanical into electrical energy, which consists of a magnetic field including a variablereluctance path and a coil surrounding all or a part of this path, so that variation in reluctance leads to a variation in the magnetic flux through the coil and a corresponding induced emf electromotive force. Octs defined as sensors that directly or indirectly use optical sensing methods to measure electric currents. To measure currents power stations and substations.
Magnetooptic current transformer polarization waves. 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. Magneto optic current transformer full seminar reports, pdf seminar abstract, ppt, presentation, project idea, latest technology details, ask latest information. Once deemed specialized devices intended for novel applications, optical sensors have risen to a performance level exceeding conventional magnetic devices.
Optical current sensors ocss based on the faraday effect. Also explore the seminar topics paper on magnetooptical current transformer technology moct with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year electronics and telecommunication. A wide variety of optical current transformer options are available to you, such as current, potential, and electronic. 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 optical transducer convert light into electrical quantity. Michael faraday discovered that the orientation of linearly polarized light was rotated under the influence of the magnetic field when the. Current sensor in pcb technology pavel ripka, member, ieee, jan kubik, maeve duffy, william gerard hurley, senior member, ieee, and stephen oreilly abstracta novel dcac current sensor works on the. A current measurement technique using the magneto optic or faraday effect has been developed, tested, and demonstrated.
Proximity sensors convert information on the movement or presence of an object. To measure currents, power stations and substations conventionally employ inductive type current transformers with core and windings. Properties and structure of faraday rotating glasses for. Moct technology provides solution to many of the problems of conventional current. A fiberoptic current sensor focs is a current sensor for measuring direct current. Vh is a function of the current density, the magnetic field, and the charge density and carrier mobility of the conductor. Pdf magneto optic current transformer technology moct. Mocs employs the faraday effect of magneto optical material, such as diamagnetic flint glass or paramagnetic rareearth glass, as sensing principle.
The magneto optic current transformer moct is a passive optical current transducer which uses light to accurately measure current on high voltage systems. Galvanomagnetic effects occur when a material carrying an electrical current is exposed to a magnetic field hall effects, an electric field are generated when a perpendicular magnetic field plus a feeding current in a semiconductor the effect are. The faraday effect is the rotation of the polarization state of light. The device developed is a magneto optic current transducer moct. Magneto optical current transducers moct based on faraday effect have been developed worldwide as alternative to conventional optical ones because mocts are compact and lightweight, immune to electromagnetic noise, and they offer a wide measurement range and long distance signal transmission. The influence of birefringence on the measuring signal is discussed. The physical origin of the magneto optical effects is phenomenologically discussed. Magneto optic current transducer moct ppt published in. Optical current sensors with mainly optical fibers do not suffer from electromagnetic interference, has lightweight and small size, and possess a low suscepti bility to environmental influences 1. The sensor principle is the faraday rotation of a light beam through a magnetooptical material. Mar 25, 2012 conclusion this magneto optical current transducer eliminates many of the drawbacks of the conventional current transformers.
Influence of magnetic field inhomogeneity on a magneto. Magnetooptical effect and applications mint center. This magneto optical current transducer eliminates many of the drawbacks of the conventional current transformers. Download the seminar report for magneto optic current transformer. It is clear that each traditional sensor can satisfy only a few of the desirables previously listed. A specific area where optical current sensors outperform. In an conventional current transformers, there is a chance of saturation of magnetic field under high current, complicated insulation and cooling. Magneto optic current transformer, ask latest information, magneto optic current transformer abstract,magneto optic current transformer report,magneto optic current transformer presentation pdf,doc,ppt,magneto optic current transformer technology discussion,magneto optic current transformer paper presentation details,magneto optic current transformer, ppt, pdf, report, presentation, source. Technical explanation for proximity sensors overview what is a proximity sensor. Pdf optical current sensors for high power systems. Two prototypes based on the obtained glass and fibers were constructed. Download moct seminar report and ppt to learn more. The figure below describes the exact working of a magnetostrictive transducer.
The moct measures the electric current by means of faraday effect. Here we will study the case of a polarimetric current sensor. Department of optoelectronics, silesian university of technology, 2 krzywoustego st. Advantages of optical current and voltage sensors and.
Magnetooptical current transformer technology moct. A new type of clampon magnetooptical current transducer based on the faraday effect is presented. It uses the rotation of the plane of polarization by a magnetic field exhibited in certain glasses faraday effect. February 7th, 2017 by afsal meerankutty 1 comment an accurate current transducer is a key component of any power system instrumentation. A current measurement technique using the magnetooptic or faraday effect, has been developed, tested, and demonstrated. In order to improve metrological characteristics of. Acoustooptics is a phenomenon which deals with the interaction of light optics and sound acoustics.
Magneto optic current transformer full seminar report, abstract. The optical transducer can be classified as photo emissive, photoconductive and photovoltaic transducers. Particular attention is payed to using an optical fiber both as a transmission line and a measuring sensor. An optical current transducer configured to sense current in the conductor is disclosed. The good sensitivities of the fiber magneto optical current transducer and the bulk magneto optical current transducer are due to the high verdet constant and homemade signalacquisition hardware. Abb fiberoptic current sensor focs for high dc currents. Based on principle of faraday effect, high rotation material is fundamental for. Diamagnetic teo 2 znona 2 o glasses and fibers were fabricated and characterized for magneto optical current sensor applications. Conventional current transformers becomes more and more bulky and costly. An accurate electric current transducer is a key component of any power system instrumentation. Magneto optical current transformer technology provides a solution.
Fiberoptic sensor for aircraft lightning current measurement. A magnetooptical measuring transducer for use as a faraday rotator in a device to measure high currentsvoltages in response to a magnetic field created by the current to be measured by rotating the direction of polarization of a beam of polarized light characterized by the transducer having a first magnetically saturable part and a second part which has a paramagnetic behavior. It uses the rotation of the plane of polarization by a magnetic field exhibited in certain glasses. A brief historical overview is given together with a more detailed focus on. The concept of the optical sensors is the magneto optical principle. Explore magnetooptical current transformer technology moct with free download of seminar report and ppt in pdf and doc format. In this work, fiberoptic sensors based on different mechanisms such as magnetic fielddependent polarization coherence and power scattering effects in magneto optical materials are demonstrated. Optical current transducers for electrical power systems nist page. Optical current sensors are achieving increased acceptance and use in high voltage substations due to their superior accuracy, bandwidth, dynamic range and inherent isolation. Design and development of a lowcost optical current sensor. Us3980949a magnetooptical measuring transducer for very. Wave propagation in the magnetooptical material and rotation of its. The photo emissive devices operate on the principle that radiation falling on a cathode causes electrons to be emitted from the cathode surface.
Proximity sensor includes all sensors that perform noncontact detection in comparison to sensors, such as limit switches, that detect objects by physically contacting them. Technologies addressed include all fiber sensors, bulk magneto optical sensors, piezoelectric transducers, magnetic. Conclusion this magneto optical current transducer eliminates many of the drawbacks of the conventional current transformers. The magneto optical current transducer eliminates many of the drawbacks of the conventional current transformers. Performance of magnetooptical glass in optical current. Osa diamagnetic tellurite glass and fiber based magneto. Optical current transformer polarization waves electric. Require an external source of power excitation voltage that provides the majority of the output power of the signal 2 passive sensors. Magnetostrictive transducers for optical fiber magnetic field. Magnetooptic current transformer free download as word doc. Hardware and developed software were constructed for the acquisition of weak output signals induced by a low current.
Applications for the sensors can be found in forensics and quality control of magnetic materials. This kind of sensors can be used for measuring classic measurands like temperature, mechanical strain or pressure, however their field of expertise is currents or tensions measuring. Magneto optic current transducer consist of a sensor head located near the current carrying conductor, an electronic signal processing unit and fiber optical cables linking to these two parts. Our highly sensitive magneto optical sensors are the basis for the visualization of magnetic fields and are available in sizes up to 3 inches. The light is communicated to a magneto optic garnet that includes, among other elements, bismuth, iron and oxygen and is coupled to the conductor. Recent developments in this vibrant field are improving magnetometers in many traditional areas such as measurement of geomagnetic anomalies and magnetic fields in space, and are opening the door to new ones, including, dynamical measurements of biomagnetic fields. Based on the magneto optic 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. Also get the seminar topic paper on magnetooptical current transformer technology moct with abstract or synopsis, documentation on advantages and disadvantages, presentation slides for ieee final year electronics and telecommunication engineering or ece students for the year 2016 2017. Current transducers a bulkoptics current transducer abbs first generation magneto optic current transducer moct with more than 10 years of field experience exploits the faraday effect in a. In the following, we will consider optical current and voltage sensors that have been developed at abb and examples of their applications. The history of magneto optical effects is first introduced.
The core in the form of a 710mm ring made of electrodeposited permalloy is sandwiched in the middle of a printed. This is explained more in detail in the coming sections. An introduction to acoustooptics scott e pollack physics 7810 fundamentals of optics and lasers university of colorado, boulder december, 2002 abstract this paper is a brief introduction to acoustooptic phenomena. Electromagnetic transducer when a moving conductor of length l or a singleturn coil of the same length moves with a velocity dsdt across and perpendicular to the lines of magnetic flux of density b, an emf is generated in the conductor coil which is given by faradays law as ebl dsdt. A current measurement technique using the magneto optic or faraday effect, has been developed, tested, and demonstrated. Magnetooptical current transformer technology moct seminar. Optical fiber sensors polarimetric current sensors. A brief historical overview is given together with a more detailed focus on recent developments. Magnetostrictive transducermagnetostriction,working. Yansong li, jun wan, weiwei zhang, and jun liu, analysis of antimagnetic interference properties and structural optimization of magneto optical glass current sensors, appl.
This paper explores optical current sensors for aircraft lightning measurement, specifically sensors based on optical fiber. The seminar topic is based on magneto optical current. Fiberoptic current and voltage sensors for highvoltage. The easy and flexible use characterizes this technical innovation. Now l ds represents an area through which the flux. Get magnetooptical current transformer technology moct seminar report and ppt in pdf and doc. Acoustooptical effects principles and applications. The principles of measuring currents in highvoltage lines by magnetooptical means are described. Nov 17, 20 conclusion this magneto optical current transformer eliminates many of the drawbacks of the conventional current transformers. The magneto optical current transformer is based on the faradays effect. The sensor is configured as a sagnac interferometer structure with a magnetic fluid film and a section of polarization maintaining fiber inserted into the fiber loop to produce a sinusoidal interference spectrum for measurement.
The professional energy monitoring company provides a complete line of current, voltage, frequency, power and power factor sensors that enables our customers to solve the challenges they face in an ever changing competitive environment. It is openable, hybrid, and squareshaped, and it has an. Octs are based on faraday effect, interferometric principle, bragg grating and micromechanical sensors with optical readout. The optical current transducer includes a light source and a polarizer that generates linearly polarized light received from a the light source. Hall effect sensor the hall effect may be used to measure magnetic fields and hence in contactfree current measurement, but its commonest application is in motion sensors. Fiber optics current sensor free standing focsfs is a freestanding 3phase sensor system for 245 kv to 800 kv high voltage substations one system consists in.
Optical current sensors have been under development for decades. Several groups have shown the use of faraday rotation in magneto optical materials as a function of current induced magnetic field. The physical principles of magneto optical recording by masud mansuripur cambridge university of press, 1995. Diamagnetic tellurite glass and fiber based magnetooptical. Optical current transducer for electric power system. Magnetooptic current transformer polarization waves transformer.
Nov 26, 2006 some of the most sensitive methods of measuring magnetic fields utilize interactions of resonant light with atomic vapor. Also explore the seminar topics paper on magnetooptical current transformer technology moct with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year electronics and telecommunication engineering or. Fiber optic current sensors and optical current transformers. Magnetooptical devices the optics encyclopedia castera. Temperature dependence baffles the population of mocs in power system or some other areas. Magneto optic current transformer seminar report pdf. Modelling of magnetic current sensors for measuring high. This type of sensor has been under development by the power indust ry for decades. The output power is almost entirely provided by the measured signal without an excitation voltage. Magneto optic current transformer, ask latest information, magneto optic current transformer abstract, magneto optic current transformer report, magneto optic current transformer presentation pdf,doc,ppt, magneto optic current transformer technology discussion, magneto optic current transformer paper presentation details, magneto optic current transformer, ppt, pdf, report. The authors have developed an optical current transducer based on the faraday effect of dense flint glass for the purpose of utilization in 110 kv substation. Conclusion a new type of current transducer is introduced known as magneto optical current transducer. A fiberoptic current sensor for lightning measurement. Introduction moctprinciple the magneto optical current transformer is based on the faradays effect.
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