Fiber optic current sensors and optical current transformers. Optical current transformers offer many benefits compared to conventional current trans. Pdf on jan 1, 2015, linyang chen and others published design and simulation of optical current transformer based on mixed programming of ansoft and. The global optical current transformer market can be segmented on the basis of type, voltage range and application. Fiber optic current sensors focs and optical current transformers oct author. Design and development of a lowcost optical current sensor. If the plane of polarization rotates multiple times. Michael faraday discovered that the orientation of linearly polarized light was rotated under the influence of the magnetic field when the.
Flexible electronic fiberoptic current transformers fefoct are an alternative to conventional current transformers with inductive transducers for highprecision current measurement and power quality control, in medium and high voltage systems. Some of the main features of optical current transformer are. Pdf design and simulation of optical current transformer based. February 7th, 2017 by afsal meerankutty 1 comment an accurate current transducer is a key component of any power system instrumentation. This magneto optic current transformer is widely used in power systems and substations nowadays.
Download optical current transformer oct ppt for electrical engineering seminar. Dr andy gillooly the basic principle of focs and octs is to measure polarization rotation due to 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. Explore magneto optical current transformer technology moct with free download of seminar report and ppt in pdf and doc format. Love controls lttj series current transformers allow easy monitoring of the current flowing to your load. The magnetooptic current transformer moct is a passive optical current transducer which uses light to accurately measure current on high voltage systems.
Download the seminar report for magneto optic current. Optical current transformer moct s are another type of transducers,which are highly immune to emi moct uses optical sensing methods to measure electric currents. Fiber optic current sensors focs and optical current. The principles of optical and optical fiber current sensor technology have been known for some. The sensor perfectly integrates the magnetic field along the closed path described by the sensing fiber. Development of models for optical instrument transformers by. Optical measurement of currents in power converters. Optical fibre current sensor for electrical power engineering. Magnetooptical current transformer technology moct. The 10 current is translated to the 20 current by the turns ratio n. The response of optical current transformer is the response ability of magnetic field of optical current transformer. Pdf optical current transducers octs have clear advantages over conventional current transformers. Get magnetooptical current transformer technology moct seminar report and ppt in pdf and doc. Also explore the seminar topics paper on magneto optical 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.
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 cuttingedge patented optical sensing technology. Moct block diagram applications pros and cons conclusion 3. Explore optical technology in current measurement with free download of seminar report and ppt in pdf and doc format. The 20 is measured with an ampere meter in most of the cases. These innovative current transformers provide digital output according to the iec 61850 standard for your metering and protection infrastructure. The shunt resistor rsh is an integral part of the secondary. Pdf optical current sensors for high power systems. A current transformer transforms the current down to a. Extensive bandwidth, able to measure both dc and ac current up to 100 harmonic.
The faraday effect is the rotation of the polarization state of light. With over 30 years experience of the specialty optical fiber industry, fibercore ltd, the world leader in its field, is exclusively dedicated to the design, manufacture and commercialization of specialty fibers. 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. Complete model development for an optical current transformer. Department of optoelectronics, silesian university of technology, 2 krzywoustego st. Frequency response characteristics of oit outputs are obtained. An optical metering unit omu combines optical current and voltage transducers moct and eovt in a lightweight and compact singlephase unit fig.
Fiber optic current sensors and optical current transformers version. The magnetooptic effect was discovered by sir michael faraday. The influence of birefringence on the measuring signal is discussed. Sdoict is a fully passive optical transducer that provides a digital measurement solution for metering and protection. On subtractive polarity transformers the h1 primary lead and the x1 secondary lead will be on the same. The principles of measuring currents in highvoltage lines by magnetooptical means are described.
An optical current transformer in which two light beams coming from the same source successively pass through. When the preset trip current is reached or exceeded, light pulses will be emitted. Advantages of optical current and voltage sensors and. During the forecast period, north america will be closely followed by asia pacific in terms of expected demand. The iccs consists of an inductive current transformer having a primary winding, a small core and a minimizedloss secondary winding. 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 transformers are current sensors which work on the magnetooptic effect. Octs are the sensing services that directly or indirectly uses optical sensing methods to measure electric current. Polarity refers to the instantaneous direction of the primary current with respect to the secondary current and is determined by the way the transformer leads are brought out of the case.
Current transformer white paper the basics of current transformers ratio the ct ratio is the ratio of primary current input to secondary current output at full load. T1 complete model development for an optical current transformer. Ieee trialuse standard for optical ac current and voltage sensing systems no shorttime thermal test is required for optical current transformers unless they use magnetic cores or wire windings. Arteche optical current transformer is presented as an alternative to current conventional current transformers, offering an advanced solution for both measuring and protection applications based on optical technology. The basics of current transformers nk technologies. Experimental comparison of conventional and optical.
Karady, life fellow, ieee abstractseveral manufacturers offer optical current transformers octs to replace the conventional magnetic. Optical current transformer for gas insulated switchgear. These sensors work by measuring the angle of rotation of a polarized beam of light. Contents introduction ct purpose and demerits moct principle, design, working. The moctp system is suitable for outdoor application and has a continuous current rating. The main challenge with conventional current transformers in. The seminar topic is based on magneto optical current transformer presented byaishwarya verma0902011 2. Current transformer the mostused device for measurements of alternating currents in electrical high and mediumvoltage networks is the ct current transformer. Trench optical current transformers are based on faraday effect principle.
The faraday effect states that the rotation of the plane of polarization of a beam of light which passes read more. Fiberoptic current and voltage sensors for highvoltage. Optical current transformeroct is defined as sensors that directly or indirectly use optical sensing methods to measure electric currents. Arteches sdooct is a passive, modular optical current transformer that can be used for any voltage level.
Current transformer power system analysis free lecture pdf download resistance and leakage reactance of transformer or impedance of transformer power system analysis free lecture notes download theory of transformer on load, with resistance and leakage reactance in transformer power system analysis free pdf download. Optical technology in current measurement seminar report. The paper presents the experimental results of the investigations of optical. Optical current transformer market global industry. Moct optical current transformer system for metering 72. The reduced size and increased accuracy of the omu compared to conventional oilfilled current and voltage transformers make the design particularly. Optical current transducers for electrical power systems nist page. Optical current transformers based on optical fibre sensors are now being. Moct is a passive optical current transducer which uses light to. Magneto optic current transformer market segmentation and. 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.
An accurate electric current transducer is a key component of any power system instrumentation. Optical current transformer oct is defined as sensors that directly or indirectly use optical sensing methods to measure electric currents. Current transformers cts and voltage transformers vts are used extensively in substations for measuring and monitoring voltage and current. Optical current transformer is an alternative to the existing conventional current. Introduction moctprinciple the magneto optical current transformer is based on the faradays effect. This easy to use device provides a 0 to 10 vdc signal into both low and high impedance circuits, and is easily scalable to your needs. Extensive bandwidth, able to measure both dc and ac current up to 100 harmonic and above. Series lttj current transformer allows easy monitoring. What is an optical current transformer and how do they. 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. Introduction moctprinciple the magnetooptical current transformer is based on the faradays effect.
The linear birefringence was reduced by twisting the newly developed double coated optical fiber. Explore magnetooptical current transformer technology moct with free download of seminar report and ppt in pdf and doc format. A dissertation presented in partial fulfillment of the. New dc current measurement technology with fiberoptic sensor. The output is a low power optical signal which is then transferred to a merging unit which adapts it to communication protocols such as iec 6185092. A fiberoptic current sensor focs is a current sensor for measuring direct current. Fiberoptic current sensor focs in the fiberoptic current sensor a simple loop of optical fiber around the bus bar replaces the sophisticated head of the conventional transformer. Application of optical current transformers in digital. Experimental comparison of conventional and optical current transformers article in ieee transactions on power delivery 254. Octs are based on faraday effect, interferometric principle, bragg grating and micromechanical sensors with optical readout. 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. Particular attention is payed to using an optical fiber both as a transmission line and a measuring sensor. The high accuracy optical current transformer optical ct for gas insulated switchgear gis using a silica optical fiber has been developed. Current transformer with integrated trip threshold detection capability.
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