Academic literature on the topic 'Optical current transformer'

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Journal articles on the topic "Optical current transformer"

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Yang, Jun, Ziming Fan, Yue Yang, and Xiayao Zhao. "Introduction on Current Application of Voltage Transformer." E3S Web of Conferences 375 (2023): 03028. http://dx.doi.org/10.1051/e3sconf/202337503028.

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As an important equipment, voltage transformer is widely used in power grid to obtain voltage signal and protect the system. In this paper, the voltage transformers in power system are classified according to the working principle. The working principle and characteristics of potential transformer (PT), capacitor voltage transformer (CVT), electronic voltage transformer (EVT) and optical voltage transducer (OVT) are briefly analyzed. Besides, this paper also introduces the principle, category and characteristics of voltage transformer, as well as the application and development of voltage transformer in power system.
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Li, Ying Jin, Yue Ma, and Wen Li Wang. "New Application of Fibre Optical Current Transformer in Smart Retrofit Substation." Advanced Materials Research 614-615 (December 2012): 1846–50. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.1846.

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The paper studied the outside attachment of fibre optical current transformer in smart GIS substation innovation projects. Based on Ampere circuital theorem, sensing optical fibre can be wrapped around the flange at the bottom of the GIS bushing without modification damage on GIS components and long time power cut. The experiment result proved the accuracy and feasibility of this new application. Furthermore, kinds of electronic transformers are compared with fibre optical current transformer, and the analysis gives a conclusion that fibre optical current transformer could be the optimization of system design in smart substation innovation projects.
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Wang, Jia Ying, Yue Zhang, Guo Qing Zhang, and Zhi Zhong Guo. "Body-Efficiency Character Analysis for Mini Optical Current Transformer." Advanced Materials Research 679 (April 2013): 35–39. http://dx.doi.org/10.4028/www.scientific.net/amr.679.35.

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All-electric ship is the development direction of ship in future. It’s necessary to do some further microminiature research on the optical current transformer used in all-electric ship. The microminiature research has to face the problem which is the influence of environment changes on mini-optical current transformer’s performance. Base on the theoretical model, the influence of environment changes on mini-optical current transformer’s performance has been studied in this paper. For the impact of environmental factors, temperature field and interference field of optical current transformer have been analyzed in detail. The model related temperature stabilization, anti-magnetic field interference feature, response feature with different magneto-optical material’s length. The optimal solution of the body-efficiency character model has been calculated for the design of mini-optical current transformer.
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Ma Rende, 马任德, 吴福全 Wu Fuquan, 孟祥省 Meng Xiangsheng, and 李爱国 Li Aiguo. "Design of Optical Balanced Bridge Current Transformer." Acta Optica Sinica 29, no. 10 (2009): 2876–80. http://dx.doi.org/10.3788/aos20092910.2876.

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Sasaki, Kinichi, Masao Takahashi, and Yukihisa Hirata. "Temperature-Insensitive Sagnac-Type Optical Current Transformer." Journal of Lightwave Technology 33, no. 12 (2015): 2463–67. http://dx.doi.org/10.1109/jlt.2014.2366207.

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Koide, Hidenobu, Kouji Konno, Mamoru Yamada, and Tatsuo Okamoto. "Development of optical current transformer for GIS." Optics & Laser Technology 24, no. 3 (1992): 159. http://dx.doi.org/10.1016/0030-3992(92)90123-j.

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Xu, Meng, and Xuewu Li. "Design of Optoelectronic Transformer for Its Application in Traveling Wave Protection of Power Grid." Journal of Nanoelectronics and Optoelectronics 18, no. 11 (2023): 1357–65. http://dx.doi.org/10.1166/jno.2023.3519.

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As an important foundational link of the power system, the reliable measurement and accurate data of the metering module are the important foundation and support for energy metering. As a new type of optoelectronic current transformer, magneto-optical crystal-based optoelectronic current transformer effectively avoids the defects of traditional electromagnetic current transformers and becomes an ideal equipment for measurement in power systems. This paper proposes an improvement method to enhance the temperature stability of optoelectronic current transformers, using a magneto-optical crystal sensor head based on Faraday effect to limit the fiber length to within 140 m. It considers the influence of a uniform temperature field on magneto-optical crystal materials to process data reasonably to ensure normal incidence of the incident beam. The magneto-optical crystal material in the non-uniform temperature field has non-uniform deformation due to thermal expansion and cold contraction. Here, a Karamay No. 45 cooling oil is used for filling and sealing. In the experiment, the temperature stability of the current transformer is tested. Firstly, the wiring method is designed. Then, the corresponding test system is designed. After improvement, there is no drift phenomenon in the ratio difference and angle difference of all points of the photoelectric current transformer within the testing temperature range, and the error difference is stable. The principle of identifying faults within the area is elaborated, and a directional longitudinal traveling wave protection method for direct-current transmission lines is designed based on the differential output characteristics of the designed photoelectric transformer. Through experiments, the transformer in this design can effectively identify potential traveling wave fault types and fault phases.
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Yu, Jicheng, Changxi Yue, Jun Li, Dengyun Li, and He Li. "Error Calculating and Compensating Method of All-Optical Fiber Current Transformer in ± 10 kV DC Distribution Network." Journal of Nanoelectronics and Optoelectronics 14, no. 11 (2019): 1606–15. http://dx.doi.org/10.1166/jno.2019.2680.

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Current transformer is one of the main equipment in ±10 kV DC distribution network. Traditional electromagnetic current transformer has poor anti-jamming capacity and poor insulation, so it cannot realize transient protection. The emergence of all-optical fiber current transformer brings solutions to these problems, which has attracted more and more attention. In this study, aiming at the problem of error and compensation of λ/4 waveform of all-fiber current transformer, the fabrication method of λ/4 waveform is studied, the mathematical model of the waveform is established, the influence of the waveform error on the scale factor is analyzed, and a calculating device of angle difference and ratio difference to compare the error is designed. The device adopts the principle of traceability of quantities to collect the state data of the wave plate. At the same time, in order to collect data for errors, database technology and network technology are used to realize remote transmission of monitoring data. The error of the λ/4 wave plate is compensated, the bidirectional principle generated by the birefringence in the fiber ring is analyzed, and the data logic description of the transformer sensitive ring is performed. The phase delay and the angle of the shaft are selected as the main factors causing the error. Compensation is performed by means of peak segmentation and variable cancellation. In the experimental process, compared with the error sampling of the traditional transformer, the error calculated by the current amplitude and phase angle parameters obtained by the all-fiber current transformer is more accurate, and the compensation scheme can suppress the size of the birefringence and improve sensing accuracy of fiber optic current transformers. This study provides a powerful reference for the error analysis of all-fiber current transformer λ/4 wave plates, which is beneficial to promote the better application of such current transformers.
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Donaldson, E. F., J. R. Gibson, G. R. Jones, N. A. Pilling, and B. T. Taylor. "Hybrid optical current transformer with optical and power-line energisation." IEE Proceedings - Generation, Transmission and Distribution 147, no. 5 (2000): 304. http://dx.doi.org/10.1049/ip-gtd:20000604.

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Kim, Yeong-Min, and Won-Zoo Park. "Application of an Optical Current Transformer For Measuring High Current." Journal of the Korean Institute of Illuminating and Electrical Installation Engineers 24, no. 11 (2010): 9–16. http://dx.doi.org/10.5207/jieie.2010.24.11.009.

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Dissertations / Theses on the topic "Optical current transformer"

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Turkmen, Coskun Aziz. "Calibration Of Conventional Measurement Transformers Against Harmonic Components By Using Field Measurements Of Optical Transducers And Resistive-capacitive Voltage Transformers." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611920/index.pdf.

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It is known from the literature that conventional voltage and current transformers measure inaccurate values for voltage and current harmonics which are parts of power quality. Maximum bandwidth of conventional current transformers, which are used in electricity transmission and distribution systems, is 1.5-2 kHz and it is lower for conventional voltage transformers. Also, it is known that<br>voltages in some frequency spectrum are measured higher and voltages in another frequency spectrum are measured lower by the conventional voltage transformers. Furthermore, because of the phase shift of fundamental component caused by the conventional current and voltage transformers, losses and efficiency can not be calculated accurately. In this work, through the simultaneous measurements taken at the same feeder by both conventional transformers and new technology measurement transformers<br>amplitude and phase shift errors which are caused by conventional transformers depending on frequency and so harmonics, are examined and evaluated. Amplitude coefficients and phase shifts are determined for different types of conventional transformers to be able to calibrate measurement deviation. Through this work, measured data by conventional transformers will be accurate and realistic in terms of harmonic components. This matter is important to determine whether the accurate limits which will be set in the future possibly concerning with harmonics and interharmonics, are surpassed or not<br>also for punitive sanction.
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Mohamad, Haidar Jawad. "Ultrafast optical measurements of spin-polarized electron dynamics in nanostructured magnetic materials." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/18425.

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At present, electronic devices depend upon electric charge to transfer and record information. However, such devices are approaching a scaling limit due to Joule heating. Spintronics offers a solution by exploiting the spin rather than the charge of the electron, since the propagation of spin current can in principle occur without dissipation. Immediate applications lie in magnetic random access memory and novel media for hard disk recording. Within this thesis, the Magneto-optical Kerr effect (MOKE) has been used to measure the static and dynamic magnetic properties of a number of different thin film samples that are of interest for spintronic applications. A femtosecond laser has been used to perform time-resolved MOKE (TRMOKE) and time resolved reflectivity (TRR) measurements simultaneously, which probe the spin and charge dynamics respectively. Measurements have been performed upon a continuous thin film of CrO2 that is known to be half-metallic in bulk form, and a series of YIG/Cu/Ni81Fe19 based structures that are expected to exhibit the spin Seebeck effect (SSE). Chemical vapour deposition (CVD) was used to fabricate the continuous CrO2 thin film on a (100)-oriented TiO2 substrate. Precessional magnetisation dynamics were studied by means of the TRMOKE technique. The dependence of the precession frequency and the effective damping parameter upon the static applied magnetic field were investigated. The precession frequency exhibited a minimum at the hard axis saturation field as expected. However precession was also observed for fields greater than the hard axis saturation value, perhaps suggesting the presence of a twisted magnetic state within the film. TRMOKE and TRR measurements were performed upon the YIG/Cu/Ni81Fe19 based structures for different values of the pump fluence and applied magnetic field. For fixed pump fluence and varying applied field, the frequency of precession is well described by a numerical solution of the Landau-Lifshitz equation for the Ni81Fe19 (permalloy, Py) layer. The frequency, amplitude, damping, phase and chirp of the precessional oscillations was extracted from measurements made with a field of 3 kOe applied at 2.8° from the normal to the sample plane, in a configuration designed to maximise any spin transfer torque (STT) generated by the SSE. The oscillation parameters extracted for trilayer samples and a Py reference sample were found to be very similar. Features indicative of STT predicted by simulations were not observed. This suggests that either the YIG/Cu interface was unable to efficiently transmit spin current within the samples studied here, or else that the STT generated by means of the SSE is too small to be of practical use.
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"Development of Models for Optical Instrument Transformers." Doctoral diss., 2010. http://hdl.handle.net/2286/R.I.8806.

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abstract: Optical Instrument Transformers (OIT) have been developed as an alternative to traditional instrument transformers (IT). The question "Can optical instrument transformers substitute for the traditional transformers?" is the main motivation of this study. Finding the answer for this question and developing complete models are the contributions of this work. Dedicated test facilities are developed so that the steady state and transient performances of analog outputs of a magnetic current transformer (CT) and a magnetic voltage transformer (VT) are compared with that of an optical current transformer (OCT) and an optical voltage transformer (OVT) respectively. Frequency response characteristics of OIT outputs are obtained. Comparison results show that OITs have a specified accuracy of 0.3% in all cases. They are linear, and DC offset does not saturate the systems. The OIT output signal has a 40~60 &mu;s time delay, but this is typically less than the equivalent phase difference permitted by the IEEE and IEC standards for protection applications. Analog outputs have significantly higher bandwidths (adjustable to 20 to 40 kHz) than the IT. The digital output signal bandwidth (2.4 kHz) of an OCT is significantly lower than the analog signal bandwidth (20 kHz) due to the sampling rates involved. The OIT analog outputs may have significant white noise of 6%, but the white noise does not affect accuracy or protection performance. Temperatures up to 50oC do not adversely affect the performance of the OITs. Three types of models are developed for analog outputs: analog, digital, and complete models. Well-known mathematical methods, such as network synthesis and Jones calculus methods are applied. The developed models are compared with experiment results and are verified with simulation programs. Results show less than 1.5% for OCT and 2% for OVT difference and that the developed models can be used for power system simulations and the method used for the development can be used to develop models for all other brands of optical systems. The communication and data transfer between the all-digital protection systems is investigated by developing a test facility for all digital protection systems. Test results show that different manufacturers' relays and transformers based on the IEC standard can serve the power system successfully.<br>Dissertation/Thesis<br>Ph.D. Electrical Engineering 2010
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Book chapters on the topic "Optical current transformer"

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Li, Hongbo, Xingguo Cai, Guoqing Zhang, and Zhizhong Guo. "Transient Performances Analysis and Experiment for Optical Current Transformer." In Lecture Notes in Electrical Engineering. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-4981-2_91.

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Liu, Yong, Songyuan Liu, Bin Liu, Xiaozhou Wang, Junjun Xiong, and Minrui Xu. "Experimental Study on Vibration and Buffering of All-Fiber-Optical Current Transformer Polarization Maintaining Fiber." In Lecture Notes in Electrical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-96-2080-7_31.

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Bohnert, Klaus. "Hybrid Current Transformers." In Optical Fiber Current and Voltage Sensors. CRC Press, 2024. http://dx.doi.org/10.1201/9781003100324-12.

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Domański, Andrzej W., and Tomasz J. Rżysko. "The Choice of Optimal Light Source for Magnetooptical Fiber Optic Current Transformer." In Laser in der Technik / Laser in Engineering. Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84736-3_127.

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Mu, Xiaojing, Yong Liu, Junjun Xiong, and Bin Liu. "Study on Vibration and Temperature Aging Characteristics of Fiber-Optic Current Transformer." In Lecture Notes in Electrical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-8780-7_7.

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Xie, J., T. Shen, L. Liu, et al. "Simulation of fiber optical current transformer base a novel structure." In Electronic Engineering and Information Science. CRC Press, 2015. http://dx.doi.org/10.1201/b18471-180.

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Yue, Kai, Guo-qing Zhang, Cui Yang, Zhi-qing Liu, and Dong Yin. "Full-waveform current differential protection based on optical current transformers." In Machinery, Materials Science and Engineering Applications. CRC Press, 2017. http://dx.doi.org/10.1201/9781315375120-29.

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Selviah, David R. "High Speed Optical Higher Order Neural Networks for Discovering Data Trends and Patterns in Very Large Databases." In Artificial Higher Order Neural Networks for Economics and Business. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-59904-897-0.ch020.

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This chapter describes the progress in using optical technology to construct high-speed artificial higher order neural network systems. The chapter reviews how optical technology can speed up searches within large databases in order to identify relationships and dependencies between individual data records, such as financial or business time-series, as well as trends and relationships within them. Two distinct approaches in which optics may be used are reviewed. In the first approach, the chapter reviews current research replacing copper connections in a conventional data storage system, such as a several terabyte RAID array of magnetic hard discs, by optical waveguides to achieve very high data rates with low crosstalk interference. In the second approach, the chapter reviews how high speed optical correlators with feedback can be used to realize artificial higher order neural networks using Fourier Transform free space optics and holographic database storage.
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Selviah, David R. "High Speed Optical Higher Order Neural Networks for Discovering Data Trends and Patterns in Very Large Databases." In Database Technologies. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-058-5.ch063.

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This chapter describes the progress in using optical technology to construct high-speed artificial higher order neural network systems. The chapter reviews how optical technology can speed up searches within large databases in order to identify relationships and dependencies between individual data records, such as financial or business time-series, as well as trends and relationships within them. Two distinct approaches in which optics may be used are reviewed. In the first approach, the chapter reviews current research replacing copper connections in a conventional data storage system, such as a several terabyte RAID array of magnetic hard discs, by optical waveguides to achieve very high data rates with low crosstalk interference. In the second approach, the chapter reviews how high speed optical correlators with feedback can be used to realize artificial higher order neural networks using Fourier Transform free space optics and holographic database storage.
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Frączak, Daria. "Chemical Recycling of Polyolefins (PE, PP): Modern Technologies and Products." In Current Topics in Recycling [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99084.

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Chemical recycling is one of the most intensively developed potential solutions for the global plastic waste issue. This broadly defined term covers several different technologies that lead to many diverse products. Polyolefins (polyethylene and polypropylene) can be chemically recycled by pyrolysis (cracking) or gasification. These polymers’ chemical composition and structure make them a great potential source of valuable hydrocarbons or carbon atoms for syngas production. Thermal and catalytic cracking of polyethylene and polypropylene can be optimised to maximise specific types of hydrocarbons that, after optional additional processing, such as hydrotreatment, steam cracking or distillation, can be used as intermediates in petrochemical plants, fuels or fuel components, monomers for polymerisation of new, virgin polymers or as specialty chemicals (final market products). Gasification of plastic waste transforms polymers into a mixture of hydrogen, carbon monoxide and carbon dioxide, which can be further used as a source of these gasses, transformed into chemicals and fuels, or used directly to produce energy. This chapter presents all of these process paths with examples of existing technologies and their level of technology readiness and perspectives for scale-up.
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Conference papers on the topic "Optical current transformer"

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Yu, Wenbin, Wei Zhou, Zejiang Ren, and Guizhong Wang. "Effects of Variable Parameters on the Transfer Characteristics of Fiber Optical Current Transformer." In 2024 4th International Conference on Electrical Engineering and Control Science (IC2ECS). IEEE, 2024. https://doi.org/10.1109/ic2ecs64405.2024.10928700.

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Yu, Ning, Wenxin Feng, Junjie Lan, et al. "Study of key operation and maintenance parameters of optical measurement system based on purely optical current transformer." In 2024 IEEE International Conference on DC Technologies and Systems (DCTS). IEEE, 2024. https://doi.org/10.1109/dcts62535.2024.10941128.

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Hong, YuanRui. "A method for determining the abnormal state of current transformer accuracy based on statistical relative eigenvalue." In International Conference on Physics, Photonics and Optical Engineering (ICPPOE 2024), edited by Yingkai Liu. SPIE, 2025. https://doi.org/10.1117/12.3059647.

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Qiu, Jin, Xingyue Chen, Shipu Wu, Xixiu Wu, and Fubin Pang. "Research on High Fault-tolerant Control Method for Step Response of Fiber Optical Current Transformer." In 2024 4th International Conference on Energy, Power and Electrical Engineering (EPEE). IEEE, 2024. https://doi.org/10.1109/epee63731.2024.10875397.

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Li, Binbin, Heng Lu, Jie Huang, Yabin Ma, Shaorui Qin, and Jinfei Qin. "Online evaluation method for measuring error of Fiber Optical Current Transformer based on Canonical Variable Analysis." In 2024 4th International Conference on Electrical Engineering and Control Science (IC2ECS). IEEE, 2024. https://doi.org/10.1109/ic2ecs64405.2024.10927726.

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Mahtani, Kumar, Rubén Pascual Jimenez, José M. Guerrero, Carlos A. Platero, David Talavera, and María D. López. "Optimal Sizing of Premagnetization Transformers to Mitigate the Inrush Current of Power Transformers." In 2024 IEEE International Conference on Environment and Electrical Engineering and 2024 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe). IEEE, 2024. http://dx.doi.org/10.1109/eeeic/icpseurope61470.2024.10751647.

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Yin, Xiaodong, Yuzhuo Chen, Feng Zhou, et al. "Time Domain Demodulation Algorithm for Current Transformers Based on Saganc Interferometer." In 2024 22nd International Conference on Optical Communications and Networks (ICOCN). IEEE, 2024. http://dx.doi.org/10.1109/icocn63276.2024.10648411.

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Ivanov, Nikolay A., and Oleg O. Khamisov. "Breaking Through Saturation: Enhancing Line Differential Relay Sensitivity with Optical Current Transformers." In 2024 IEEE 25th International Conference of Young Professionals in Electron Devices and Materials (EDM). IEEE, 2024. http://dx.doi.org/10.1109/edm61683.2024.10615081.

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Barczak, Kamil, and Mateusz Szablicki. "Configurable optical fiber current transformer." In 18th Conference on Optical Fibers and Their Applications, edited by Ryszard S. Romaniuk, Andrzej Smolarz, and Waldemar Wójcik. SPIE, 2019. http://dx.doi.org/10.1117/12.2522345.

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Henderson, P. J., N. E. Fisher, and D. A. Jackson. "Current Metering Using Fibre-Grating Based Interrogation of a Conventional Current Transformer." In Optical Fiber Sensors. OSA, 1997. http://dx.doi.org/10.1364/ofs.1997.owc11.

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