Display instrument for electronic current transformer. Compensation of phase modulation disturbance in all fiber. 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. A blockshape sensor 3 made of lead glass or the like is. Moct optical current transformer system for metering 72. Application of optical current transformers in digital. Optical current transformeroct is defined as sensors that directly or indirectly use optical sensing methods to measure electric currents. Download the seminar report for magneto optic current. Particular attention is payed to using an optical fiber both as a transmission line and a measuring sensor. An accurate current transducer is a key component of any power system instrumentation. Extensive bandwidth, able to measure both dc and ac current up to 100 harmonic and above. Pdf design and simulation of optical current transformer based.
When the preset trip current is reached or exceeded, light pulses will be emitted. 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. The principles of measuring currents in highvoltage lines by magnetooptical means are described. Magneto optic current transformer linkedin slideshare. To measure currents, power stations and substations conventionally employ inductive type current transformers. They are widely used in substations and power systems. An accurate electric current transducer is a key component of any power system instrumentation. Optical current transducers for electrical power systems nist page. 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. 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.
Advantages of optical current and voltage sensors and. Magnetooptical current transformer technology moct. Vaasa, finland, working on current related phenomena losses, temperatures, shortcircuit forces in electric power equipment. The sensor perfectly integrates the magnetic field along the closed path described by the sensing fiber. The response of optical current transformer is the response ability of magnetic field of optical current transformer. Optical current transformers are suitable for power system protection and can replace the magnetic current transformers. Octs are based on faraday effect, interferometric principle, bragg grating and micromechanical sensors with optical readout. Magneto optic current transformer technology moct attish jain btech, eee, srm university kancheepuram kattankulathur 603203 abstract.
Moct block diagram applications pros and cons conclusion 3. Optical current transformers are also known as fibre optic current sensors fcos. Current transformers cts and voltage transformers vts are used extensively in substations for measuring and monitoring voltage and current. Compensation of phase modulation disturbance in all fiberoptical current transformer article in applied mechanics and materials 2912941. 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. Nonconventional instrument transformers in high voltage.
Optical current transformer oct ppt topics for seminar. 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. Optical current transformer, fiber optic, current sensor, protection, current transducer e 1 5 0 54. Magnetooptical current transformer technology provides a solution. Development of models for optical instrument transformers by. Fiber optic current sensors and optical current transformers. Optical technology in current measurement seminar report. Optical current transformer market global industry. Frequently asked questions midwest current transformer.
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. Trench optical current transformers do not contain electronic parts and do not use oil or sf6 as insulation. Fiberoptic current and voltage sensors for highvoltage. Download optical current transformer oct ppt for electrical engineering seminar.
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. To measure currents power stations and substations conventionally employ inductive type current transformers with core and windings. Fibre optic current sensors are usually integrated with devices such as breakers. Explore optical technology in current measurement with free download of seminar report and ppt in pdf and doc format. Get the answers to frequently asked questions about current transformer at midwest current transformer. The seminar topic is based on magneto optical current transformer presented byaishwarya verma0902011 2. Although the maximumgenerated current in the setup was 1200 a, the impedance of the magnetic current transformer limited the generated current to 762 a. Fiber optic current sensors focs and optical current. Conventional current transformers becomes more and more bulky and costly. A fiberoptic current sensor focs is a current sensor for measuring direct current. Extensive bandwidth, able to measure both dc and ac current up to 100 harmonic. Moctp optical current transformer system abb ag pdf. Pdf optical current transducers and error sources in. The reduced size and increased accuracy of the omu compared to conventional oilfilled current and voltage transformers make the design particularly.
Aftab khan abb inc, 100 distribution circle, mount pleasant, pa 15666, usa abstract. It appears that the newly emerged magneto optical current transformer technology provides a solution for many of the above mentioned problems. An optical metering unit omu combines optical current and voltage transducers moct and eovt in a lightweight and compact singlephase unit fig. Explore magnetooptical current transformer technology moct with free download of seminar report and ppt in pdf and doc format. 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. The moct measures the electric current by means of faraday effect, which was first observed by michael faraday 150 years ago.
A wide variety of optical current transformer options are available to you, such as usage, coil number, and coil structure. Their task is the sampling of voltage and current for use in measurement and protection 15. Some of the main features of optical current transformer are. In both cases, transformer models were investigated using 2 different burdens low and high resulting in 4 models being considered. Get magnetooptical current transformer technology moct seminar report and ppt in pdf and doc. Current transformer with integrated trip threshold detection capability. With short circuit capabilities of power system getting larger and the voltage level going higher the conventional current transducers becomes more. 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 fibre optic cable is used to transmit light pulses from the ct to the evaluation unit in the housing. Arteches sdooct is a passive, modular optical current transformer that can be used for any voltage level. Magneto optic current transformer seminar report pdf. A current transformer transforms the current down to a reasonable level and provides an isolation barrier. During the forecast period, north america will be closely followed by asia pacific in terms of expected demand. 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. Optical current transformer oct is defined as sensors that directly or indirectly use optical sensing methods to measure electric currents. Current transformer the mostused device for measurements of alternating currents in electrical high and mediumvoltage networks is the ct current transformer. The designs take into account the harshest environmental conditions of temperature, vibrations and electromagnetic compatibility. The electromagnetic current transformer model has been taken from reference 12.
What is an optical current transformer and how do they. The optical current transformer model has been presented in section ii. To measure currents power stations and substations conventionally employ inductive type current transformers. The global optical current transformer market can be segmented on the basis of type, voltage range and application. Display instrument for electronic current transformer zhigang di, chunrong jia and jingxuan zhang college of electrical engineering, hebei united university, tangshan hebei, china. Today nonconventional current and voltage transformers have achieved high performance. The optical sensors are implemented using a variety of different optical. The 20 is measured with an ampere meter in most of the cases. Contents introduction ct purpose and demerits moct principle, design, working. Fiberoptic current sensor, faraday effect, fault selective equipment, hall effect current transformer special edition paper.
Pdf on jan 1, 2015, linyang chen and others published design and simulation of optical current transformer based on mixed programming of ansoft and. Octs are the sensing services that directly or indirectly uses optical sensing methods to measure electric current. Fiber optic current sensors focs and optical current transformers oct author. 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.
Dr andy gillooly the basic principle of focs and octs is to measure polarization rotation due to the faraday effect. The advantage of these sensors is that they do not need calibration. The 10 current is translated to the 20 current by the turns ratio n. Optical measurement of currents in power converters. The faraday effect is the rotation of the polarization state of light. Current measurement with optical current transformer. 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 oct linkedin slideshare. In addition, the digital output complies with the most stringent requirements of protective relays and meters. Final solutions with respect to standardization of the. 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.
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. 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. New dc current measurement technology with fiberoptic sensor. 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 influence of birefringence on the measuring signal is discussed. Fiberoptic current and voltage sensors for highvoltage substations k. 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. Abb offers inductive current transformers for rated systems up to. 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. The moct measures the electric current by means of faraday effect. 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. Sdoict is a fully passive optical transducer that provides a digital measurement solution for metering and protection. Conventional ct are designed for secondary current of 1a or 5a suitable for high power requirement of electro mechanical meter relays. Optical current transformers offer many benefits compared to conventional.
1117 555 266 1097 1197 54 567 828 464 1475 752 1452 862 214 1504 1458 788 1572 1211 84 355 149 1116 540 1191 1243 226 303 1210 731 988 25 1430 87 495