An optical metering unit omu combines optical current and voltage transducers moct and eovt in a lightweight and compact singlephase unit fig. Vaasa, finland, working on current related phenomena losses, temperatures, shortcircuit forces in electric power equipment. With product ranges available offering polarization maintaining, bendinsensitive, rareearth doped, claddingpump and photosensitive fibers. Current transformer with integrated trip threshold detection capability.
The 20 is measured with an ampere meter in most of the cases. Optical current transformer, fiber optic, current sensor, protection, current transducer e 1 5 0 54. The moct measures the electric current by means of faraday effect. The moct measures the electric current by means of faraday effect, which was first observed by michael faraday 150 years ago. Their task is the sampling of voltage and current for use in measurement and protection 15. Compensation of phase modulation disturbance in all fiber. Final solutions with respect to standardization of the. The designs take into account the harshest environmental conditions of temperature, vibrations and electromagnetic compatibility. Fiber optic current sensors focs and optical current transformers oct author. Optical current transformers offer many benefits compared to conventional. Inrush may be high in magnitude, may contain a heavy dc offset with a long time constant, and it may have a unipolar halfwave nature. Display instrument for electronic current transformer zhigang di, chunrong jia and jingxuan zhang college of electrical engineering, hebei united university, tangshan hebei, china.
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. 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. The advantage of these sensors is that they do not need calibration. The seminar topic is based on magneto optical current transformer presented byaishwarya verma0902011 2. It appears that the newly emerged magneto optical current transformer technology provides a solution for many of the above mentioned problems. Particular attention is payed to using an optical fiber both as a transmission line and a measuring sensor. Optical current transformer oct is defined as sensors that directly or indirectly use optical sensing methods to measure electric currents. With short circuit capabilities of power system getting larger and the voltage level going higher the conventional current transducers becomes more.
A blockshape sensor 3 made of lead glass or the like is. The principles of measuring currents in highvoltage lines by magnetooptical means are described. Octs are the sensing services that directly or indirectly uses optical sensing methods to measure electric current. The global optical current transformer market can be segmented on the basis of type, voltage range and application. A fibre optic cable is used to transmit light pulses from the ct to the evaluation unit in the housing. Simple approach integration of ideal ct secondary voltage the analysis of ct flux levels under the presence of a mix of symmetrical ac and other nonsymmetrical current wave forms, especially if any modeling of ct saturation is to be included, is a rather involved process. During the forecast period, north america will be closely followed by asia pacific in terms of expected demand. Although the maximumgenerated current in the setup was 1200 a, the impedance of the magnetic current transformer limited the generated current to 762 a. The faraday effect is the rotation of the polarization state of light.
Magneto optic current transformer linkedin slideshare. Current transformers cts and voltage transformers vts are used extensively in substations for measuring and monitoring voltage and current. 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. Contents introduction ct purpose and demerits moct principle, design, working. Extensive bandwidth, able to measure both dc and ac current up to 100 harmonic. For information on the installation and care of transformers with unusual ratings of frequency, voltage or current, or on installations where unusual conditions exist refer to requirements for instrument transformers, ansiieee c57.
Download optical current transformer oct ppt for electrical engineering seminar. Fiberoptic current and voltage sensors for highvoltage. The optical current transformer model has been presented in section ii. Fiber optic current sensors and optical current transformers. Sdoict is a fully passive optical transducer that provides a digital measurement solution for metering and protection. Magnetooptical current transformer technology moct. Pdf optical current transducers and error sources in.
The sensor perfectly integrates the magnetic field along the closed path described by the sensing fiber. Fibre optic current sensors are usually integrated with devices such as breakers. The influence of birefringence on the measuring signal is discussed. Nonconventional instrument transformers in high voltage. Current measurement with optical current transformer.
Compensation of phase modulation disturbance in all fiberoptical current transformer article in applied mechanics and materials 2912941. Magnetooptical current transformer technology provides a solution. 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. 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. Magneto optic current transformer seminar report pdf. Optical current transformers are also known as fibre optic current sensors fcos. 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. In addition, the digital output complies with the most stringent requirements of protective relays and meters. 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. Explore magnetooptical current transformer technology moct with free download of seminar report and ppt in pdf and doc format. A wide variety of optical current transformer options are available to you, such as usage, coil number, and coil structure. 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. A current transformer transforms the current down to a reasonable level and provides an isolation barrier between the primary winding and the secondary winding at ground potential. When the preset trip current is reached or exceeded, light pulses will be emitted.
Some of the main features of optical current transformer are. 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 10 current is translated to the 20 current by the turns ratio n. Optical current transformers are suitable for power system protection and can replace the magnetic current transformers. Today nonconventional current and voltage transformers have achieved high performance. To measure currents power stations and substations conventionally employ inductive type current transformers with core and windings. To measure currents power stations and substations conventionally employ inductive type current transformers. Optical technology in current measurement seminar report. The response of optical current transformer is the response ability of magnetic field of optical current transformer. Explore optical technology in current measurement with free download of seminar report and ppt in pdf and doc format. Aftab khan abb inc, 100 distribution circle, mount pleasant, pa 15666, usa abstract. Pdf on jan 1, 2015, linyang chen and others published design and simulation of optical current transformer based on mixed programming of ansoft and. Moctp optical current transformer system abb ag pdf.
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. An accurate current transducer is a key component of any power system instrumentation. Get magnetooptical current transformer technology moct seminar report and ppt in pdf and doc. They are widely used in substations and power systems. Conventional current transformers becomes more and more bulky and costly. 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. Fiberoptic current and voltage sensors for highvoltage substations k. An accurate electric current transducer is a key component of any power system instrumentation. To measure currents, power stations and substations conventionally employ inductive type current transformers. In both cases, transformer models were investigated using 2 different burdens low and high resulting in 4 models being considered. A current transformer transforms the current down to a reasonable level and provides an isolation barrier. The electromagnetic current transformer model has been taken from reference 12. Optical current transformer oct ppt topics for seminar. Pdf design and simulation of optical current transformer based.
Optical current transformer oct linkedin slideshare. The optical sensors are implemented using a variety of different optical. Fiberoptic current sensor, faraday effect, fault selective equipment, hall effect current transformer special edition paper. Application of optical current transformers in digital. Trench optical current transformers do not contain electronic parts and do not use oil or sf6 as insulation. 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 transformer the mostused device for measurements of alternating currents in electrical high and mediumvoltage networks is the ct current transformer.
A fiberoptic current sensor focs is a current sensor for measuring direct current. Transformer inrush may be among the worst types of current for a magnetic ct to reproduce, because it has a combination of effects that put ct performance most at risk. Development of models for optical instrument transformers by. Current transformer errors and transformer inrush as. The magnetooptic current transformer moct is a passive optical current transducer which uses light to accurately measure current on high voltage systems. 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. Dr andy gillooly the basic principle of focs and octs is to measure polarization rotation due to the faraday effect. Optical current transformeroct is defined as sensors that directly or indirectly use optical sensing methods to measure electric currents. The microcap simulator allows using electric and magnetic equivalent circuits of the current transformer for simulation of electromagnetic transients occurring in various operating modes of. Arteches sdooct is a passive, modular optical current transformer that can be used for any voltage level. Moct block diagram applications pros and cons conclusion 3. Magneto optic current transformer technology moct attish jain btech, eee, srm university kancheepuram kattankulathur 603203 abstract. Fiber optic current sensors focs and optical current.
The basic principle of fiber optic current sensors focs and optical current transformers octs is to measure polarization rotation due to the faraday effect. Abb offers inductive current transformers for rated systems up to. 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. Frequently asked questions midwest current transformer. Extensive bandwidth, able to measure both dc and ac current up to 100 harmonic and above. Get the answers to frequently asked questions about current transformer at midwest current transformer. Octs are based on faraday effect, interferometric principle, bragg grating and micromechanical sensors with optical readout. Display instrument for electronic current transformer. New dc current measurement technology with fiberoptic sensor. Optical current transformer market global industry. What is an optical current transformer and how do they. Optical current transducers for electrical power systems nist page.
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