The magneto optical current transformer is based on the faradays effect. This is explained more in detail in the coming sections. Magnetooptical current transformer technology moct seminar. The physical origin of the magneto optical effects is phenomenologically discussed. Proximity sensors convert information on the movement or presence of an object. Optical current sensors have been under development for decades.
In the following, we will consider optical current and voltage sensors that have been developed at abb and examples of their applications. Octs defined as sensors that directly or indirectly use optical sensing methods to measure electric currents. Explore magnetooptical current transformer technology moct with free download of seminar report and ppt in pdf and doc format. In an conventional current transformers, there is a chance of saturation of magnetic field under high current, complicated insulation and cooling. Optical current sensors ocss based on the faraday effect. Modelling of magnetic current sensors for measuring high.
Once deemed specialized devices intended for novel applications, optical sensors have risen to a performance level exceeding conventional magnetic devices. The principles of measuring currents in highvoltage lines by magnetooptical means are described. Abb fiberoptic current sensor focs for high dc currents. The moct measures the electric current by means of faraday effect. To measure currents power stations and substations. Wave propagation in the magnetooptical material and rotation of its.
Osa magnetooptical fiber sensor based on magnetic fluid. A current measurement technique using the magneto optic or faraday effect has been developed, tested, and demonstrated. A specific area where optical current sensors outperform. Magnetooptical current transformer technology moct. Download the seminar report for magneto optic current. A fiberoptic current sensor for lightning measurement. 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. The paper presents the experimental results of the investigations of optical. It uses the rotation of the plane of polarization by a magnetic field exhibited in certain glasses. Moct technology provides solution to many of the problems of conventional current. Conventional current transformers becomes more and more bulky and costly. Mocs employs the faraday effect of magneto optical material, such as diamagnetic flint glass or paramagnetic rareearth glass, as sensing principle. Pdf magneto optic current transformer technology moct.
Yansong li, jun wan, weiwei zhang, and jun liu, analysis of antimagnetic interference properties and structural optimization of magneto optical glass current sensors, appl. 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. Hardware and developed software were constructed for the acquisition of weak output signals induced by a low current. 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 photo emissive devices operate on the principle that radiation falling on a cathode causes electrons to be emitted from the cathode surface. Technical explanation for proximity sensors overview what is a proximity sensor. Fiberoptic current and voltage sensors for highvoltage. Particular attention is payed to using an optical fiber both as a transmission line and a measuring sensor. 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 seminar topic is based on magneto optical current. Diamagnetic teo 2 znona 2 o glasses and fibers were fabricated and characterized for magneto optical current sensor applications. A brief historical overview is given together with a more detailed focus on.
Moct technology provides solution to many of the problems of conventional current transformer. Magneto optic current transducer moct ppt published in. Magneto optical current transformer technology provides a solution. Influence of magnetic field inhomogeneity on a magneto. 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 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.
Design and development of a lowcost optical current sensor. Optical current transducers for electrical power systems nist page. Two prototypes based on the obtained glass and fibers were constructed. Magneto optic current transformer full seminar report, abstract. Magnetooptical effect and applications mint center. Download moct seminar report and ppt to learn more. Optical current sensors are achieving increased acceptance and use in high voltage substations due to their superior accuracy, bandwidth, dynamic range and inherent isolation.
The basic principle of fiber optic current sensors focs and optical current transformers octs is to measure polarization rotation due to the faraday effect. Require an external source of power excitation voltage that provides the majority of the output power of the signal 2 passive sensors. Mar 25, 2012 conclusion this magneto optical current transducer eliminates many of the drawbacks of the conventional current transformers. Proximity sensor includes all sensors that perform noncontact detection in comparison to sensors, such as limit switches, that detect objects by physically contacting them. Here we will study the case of a polarimetric current sensor. Conclusion a new type of current transducer is introduced known as magneto optical current transducer. 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. Then the types of magneto optical effects are described, which include the varieties of the interactions of electromagnetic waves with magnetization or spins in solids. Magnetooptic current transformer free download as word doc. Pdf optical current sensors for high power systems.
The physical principles of magneto optical recording by masud mansuripur cambridge university of press, 1995. Optical current transducer for electric power system. Us3980949a magnetooptical measuring transducer for very. The core in the form of a 710mm ring made of electrodeposited permalloy is sandwiched in the middle of a printed. 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. Acoustooptical effects principles and applications. 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. Advanced photonics journal of applied remote sensing. Conclusion this magneto optical current transducer eliminates many of the drawbacks of the conventional current transformers. An accurate electric current transducer is a key component of any power system instrumentation. Magnetostrictive transducers for optical fiber magnetic field.
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. It is clear that each traditional sensor can satisfy only a few of the desirables previously listed. Magnetic transducer article about magnetic transducer by. This paper explores optical current sensors for aircraft lightning measurement, specifically sensors based on optical fiber.
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. A current measurement technique using the magnetooptic or faraday effect, has been developed, tested, and demonstrated. 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. Acoustooptics is a phenomenon which deals with the interaction of light optics and sound acoustics. Temperature dependence baffles the population of mocs in power system or some other areas.
Conference proceedings papers presentations journals. The device developed is a magneto optic current transducer moct. The influence of birefringence on the measuring signal is discussed. Fiberoptic sensor for aircraft lightning current measurement. 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. 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.
The sensor principle is the faraday rotation of a light beam through a magnetooptical material. The concept of the optical sensors is the magneto optical principle. In order to improve metrological characteristics of. Nov 26, 2006 some of the most sensitive methods of measuring magnetic fields utilize interactions of resonant light with atomic vapor. Technologies addressed include all fiber sensors, bulk magneto optical sensors, piezoelectric transducers, magnetic. Magneto optic current transformer seminar report pdf. A new type of clampon magnetooptical current transducer based on the faraday effect is presented. 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. Octs are based on faraday effect, interferometric principle, bragg grating and micromechanical sensors with optical readout.
Magnetooptical electriccurrent sensor with enhanced. February 7th, 2017 by afsal meerankutty 1 comment an accurate current transducer is a key component of any power system instrumentation. By applying faradays principle this transducer provides an easier and more accurate way of current measurements. To measure currents, power stations and substations conventionally employ inductive type current transformers with core and windings. 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. The figure below describes the exact working of a magnetostrictive transducer. It uses the rotation of the plane of polarization by a magnetic.
The faraday effect is the rotation of the polarization state of light. An optical current transducer configured to sense current in the conductor is disclosed. 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 principle of faraday effect, high rotation material is fundamental for.
It uses the rotation of the plane of polarization by a magnetic field exhibited in certain glasses faraday effect. A novel magnetic field fiber sensor based on magnetic fluid is proposed. Osa diamagnetic tellurite glass and fiber based magneto. 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. 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. Magnetooptic current transformer polarization waves transformer. Magnetooptic current transformer polarization waves. Magnetostrictive transducermagnetostriction,working. The output power is almost entirely provided by the measured signal without an excitation voltage. 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. The optical transducer can be classified as photo emissive, photoconductive and photovoltaic transducers. A current measurement technique using the magneto optic or faraday effect, has been developed, tested, and demonstrated. 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 optic current sensors and optical current transformers. Pdf optical current sensors eliminate ct saturation. 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. 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. A brief historical overview is given together with a more detailed focus on recent developments.
Advantages of optical current and voltage sensors and. Download limit exceeded you have exceeded your daily download allowance. Nov 17, 20 conclusion this magneto optical current transformer eliminates many of the drawbacks of the conventional current transformers. Several groups have shown the use of faraday rotation in magneto optical materials as a function of current induced magnetic field. Magnetooptical devices the optics encyclopedia castera. 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. The magneto optical current transducer eliminates many of the drawbacks of the conventional current transformers.
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. Department of optoelectronics, silesian university of technology, 2 krzywoustego st. Download moct ppt for seminar in electrical engineering. This type of sensor has been under development by the power indust ry for decades. Diamagnetic tellurite glass and fiber based magnetooptical. Applications for the sensors can be found in forensics and quality control of magnetic materials. Performance of magnetooptical glass in optical current. The optical transducer convert light into electrical quantity. We present to the reader the mathematical formalism used to describe this phenomena as well as the common.
To measure currents power stations and substations conventionally employ inductive type current transformers with core and windings. Moct optical current transformer system for metering 72. 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. It is openable, hybrid, and squareshaped, and it has an. Osa analysis of antimagnetic interference properties and. Optical current transformer polarization waves electric. The light is communicated to a magneto optic garnet that includes, among other elements, bismuth, iron and oxygen and is coupled to the conductor. Oct 10, 2015 diamagnetic tellurite glass and fiber based magneto optical current transducer. 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. The history of magneto optical effects is first introduced. Vh is a function of the current density, the magnetic field, and the charge density and carrier mobility of the conductor. 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. 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.
Download the seminar report for magneto optic current transformer. Michael faraday discovered that the orientation of linearly polarized light was rotated under the influence of the magnetic field when the. This magneto optical current transducer eliminates many of the drawbacks of the conventional current transformers. Optical current transformeroct is defined as sensors that directly or indirectly use optical sensing methods to measure electric currents. The optical current transducer includes a light source and a polarizer that generates linearly polarized light received from a the light source. 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. 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. Pdf optical current transducers octs have clear advantages over. Magneto optic current transformer full seminar reports, pdf seminar abstract, ppt, presentation, project idea, latest technology details, ask latest information.
Pdf a clampon optical current sensor prototype for metering and protection applications in high power systems was developed and characterized. A wide variety of optical current transformer options are available to you, such as current, potential, and electronic. The output interference spectrum is shifted as the change of the applied magnetic field. Magnetooptical current sensors of high bandwidth article in sensors and actuators a physical 811.
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. Get magnetooptical current transformer technology moct seminar report and ppt in pdf and doc. Properties and structure of faraday rotating glasses for. Current transformers cts and voltage transformers vts are used extensively in substations for measuring and monitoring voltage and current. Introduction moctprinciple the magneto optical current transformer is based on the faradays effect. The existence of an interaction between light and sound was discovered by brillouin in the. Our highly sensitive magneto optical sensors are the basis for the visualization of magnetic fields and are available in sizes up to 3 inches. 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 fiber sensors polarimetric current sensors. 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. Focs fibreoptic current sensor for measuring high dc currents. Contents introduction ct purpose and demerits moct principle. The easy and flexible use characterizes this technical innovation. 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.
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. A fiberoptic current sensor focs is a current sensor for measuring direct current. Now l ds represents an area through which the flux. 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.
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