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Journal articles on the topic 'Optical current transformer'

Author: Grafiati

Published: 5 June 2025

Last updated: 8 July 2025

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Arai, Takashi, Tomokazu Nishiyama, Junichi Yagyu, et al. "JT-60U Plasma Current Measurement by an Optical Current Transformer." Fusion Science and Technology 45, no. 1 (2004): 65–68. http://dx.doi.org/10.13182/fst04-a428.

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12

Arifin, Zainal, Muhammad Zulham, and Eko Prasetyo. "Impact of optical current transformer on protection scheme of hybrid transmission line." Indonesian Journal of Electrical Engineering and Computer Science 24, no. 1 (2021): 1–11. https://doi.org/10.11591/ijeecs.v24.i1.pp1-11.

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Continuity of power transmission is important to ensure the reliability of the electricity supply. As most system faults are temporary, the auto reclose (AR) scheme has been used extensively to minimise the outage duration, prevent widespread outages, thus increase system stability. Meanwhile, the hybrid transmission line (HTL) combining overhead line (OHL) and high voltage cable has been introduced to provide an inexpensive solution for an urban power grid. Protecting HTL with a conventional protection system would forbid the operation of the AR scheme due to difficulty to ensure whether the fault occurred on the OHL or cable section. Therefore, the circulating current protection (CCP) scheme is used in the cable section to ensure the fault location and block the AR scheme. The technology of an optical current transformer (OCT) as one of the non-conventional instrument transformers (NCIT) has emerged to provide a solution to drawbacks on the conventional current transformer (CCT). Consequently, this paper investigated the impact of using OCT over the CCT for CCP of the HTL. The result shows that OCT could be used for CCP on much longer cable sections thus increase its reliability as the AR scheme can be used on longer or multiple cable section.

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13

Kucuksari, Sadik, and George G. Karady. "Complete Model Development for an Optical Current Transformer." IEEE Transactions on Power Delivery 27, no. 4 (2012): 1755–62. http://dx.doi.org/10.1109/tpwrd.2012.2203155.

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14

Takahashi, M., H. Noda, K. Terai, et al. "Optical current transformer for gas insulated switchgear using silica optical fiber." IEEE Transactions on Power Delivery 12, no. 4 (1997): 1422–27. http://dx.doi.org/10.1109/61.634155.

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15

Bashir Ahmed, Sulieman Eldoud. "Performance Evaluation of Optical Fiber Current Transformer based Over-current Protection." FES Journal of Engineering Sciences 8, no. 1 (2019): 40–47. http://dx.doi.org/10.52981/fjes.v8i1.8.

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Optical Fiber Current transformers (OFCTs) are achieving increased acceptance and use in high voltage system due to their superior performance characteristics. It brings new feature to modern power system protection such as high accuracy, low weight, easy installation, and no-saturation. In this paper, a new OFCT is designed and implemented a long with a digital numeric system to protect electrical-feeder from over-current due to faults. Both the optical sensing head and electronic processing block are illustrated. A detailed experimental study to confirm the performances of the device is also reported. According to the measured values of ac rms current up to 2 kA, a calibration procedure was performed. The operational characteristics of the OFCT are investigated and three different scenarios based on Prototype were carried-out to evaluate the operation of the over-current protection using OFCT. The experiential results clearly illustrate the OFCT is capable to eliminate the distortion of the electrical signals caused by conventional (CT) and hence, greatly improving the reliability of the numerical protection system.

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16

Lei, Chu, Guo Zhizhong, Chen Yue, and Wang Guizhong. "Measurement of inrush current in transformer based on optical current transducer." Journal of Physics: Conference Series 1187, no. 2 (2019): 022004. http://dx.doi.org/10.1088/1742-6596/1187/2/022004.

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17

Zhou, Shihao, Hansong Tang, Benren Pan, and Wei Zhang. "Abnormal handling mechanism and improvement measures of optical DC current transformer in smart grid environment." PeerJ Computer Science 8 (November 1, 2022): e1132. http://dx.doi.org/10.7717/peerj-cs.1132.

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An optical DC current transformer anomaly handling mechanism is proposed to address the problem that the conventional DC current transformer anomaly handling mechanism cannot compensate for the defect of capacitor anomaly blocking. First, the implementation principle, modulation loop, demodulation method and its anomaly warning mechanism of the sine-wave modulated all-fibre-optic current transformer (FOCT) are investigated, and the effects of light source intensity and modulation voltage on current decoding are explained. The modulation loop is then simulated and modelled and a FOCT anomaly handling mechanism is proposed based on the Bessel function with real-time dynamic current compensation for small changes in modulation depth. Finally, an integrated dynamic test system for DC current transformers and DC protection is designed, and the actual system operation and fault model is established using the RTDS simulation system. The experiments demonstrate that the proposed FOCT anomaly handling and improvement measures can effectively improve the transient performance of FOCT, and at the same time provide a complete set of testing means for the engineering application and later upgrade and replacement of FOCT.

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18

Hou, Pei Guo, Yue Zhang, Yu Tian Wang, and Jin Zhao. "Study on Optically Powered Hall Current Transformer." Advanced Materials Research 204-210 (February 2011): 522–27. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.522.

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A hybrid fiber optically powered current transformer with the Hall element is studied and developed in this paper. The sensing probe is the zero-flux current transformer which is based on Hall Effect. The main current can be insulated from the measurement circuit by use of Hall current transformer. Due to the broad bandwidth characteristics and the high linearity between the Hall potential and measured magnetic flux density and the high sensitivity of the Hall current transformer, any changes in the excitation current can be accurately detected without distortion. The three-dimensional model of the Hall current transformer is set up by use of ANSYS software in this paper. The magnetic flux density in the opening air-gap is calculated by nonlinear magnetic analysis method of the three-dimensional finite element. Experimental data shows that the calculation method and results are reliable. At the same time, high power laser power supply is adopted to drive the electronic devices in high potential side, and the reliable insulation between the high potential and low potential is achieved by optical fibers. So the accuracy of this measurement system can be ensured.

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19

Li, Jin Wei, Yi Ning Zhang, Hao Chen, and Jue He. "Study on Error Factors of Magneto–Optical Current Transformer." Applied Mechanics and Materials 303-306 (February 2013): 853–58. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.853.

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The working principles of MOCT(Magneto–Optical Current Transformer) based on improved dual optical path detection method is studied. The MOCT’s output could be influenced by both the fluctuation of operating wavelength and the error of intersecting angle of optical axis between polarizer and analyzer . Based on IEC 60044-8 standard, the scope of the photosource wavelength and angle error of photic axis are obtained. The results would be useful for researchers and designers working in the MOCT area.

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20

Didosyan, Yuri S., Hans Hauser, and Walter Toriser. "Temperature characteristics of a new magneto-optical current transformer." International Journal of Applied Electromagnetics and Mechanics 13, no. 1-4 (2002): 277–83. http://dx.doi.org/10.3233/jae-2002-334.

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21

Shen, Tao, Chao Hu, Qian Ru Yang, Ming Xin Song, and Xin Lao Wei. "Research on Matlab Simulation Output of Optical Current Transformer." Advanced Materials Research 981 (July 2014): 133–36. http://dx.doi.org/10.4028/www.scientific.net/amr.981.133.

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The theory model of the reflective optical current transformer (OCT) has been established using Jones matrix method, and the proper devices have been chose. According to the characteristics of the transformer’s output, signal processing circuits including photoelectric translating circuit, preamplifier, correlation detector, lowpass filter and ARM processor have been designed. The simulation mode was established in the Matlab environment. The simulation analysis as well as the noise analysis was carried out. Finally, the analysis of the relationship between transformer's input and output was analyzed by using function fitting method. The fitting coefficients and error were given and quadratic or quartic curve fitting was proposed.

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22

Yan, Yu Heng, and Yan Song Li. "OCT Signal Processing Method Based on Sequential Kalman Filtering." Advanced Materials Research 1092-1093 (March 2015): 300–303. http://dx.doi.org/10.4028/www.scientific.net/amr.1092-1093.300.

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Optical current transformer (OCT) measured current signal which is mixed with strong random noise. The measured readings can’t accurately reflect the value of the measured current. Since the optical current transformer noise inside the band is basically where the measured current signal overlap,we can not use the traditional method to filter it out. This paper describes the measurement principle based on the Faraday effect of optical current transformer and signal to noise characteristics. Considering optical current transformer for low SNR characteristics, and embedded systems do not have the characteristics of a matrix library, we proposed using sequential Kalman filter to improve the real-time output signal to noise ratio. In the measured current for DC and AC conditions,we established an appropriate state space model Kalman filter.,and conduct simulation on matlab. Practice shows that the sequential Kalman filter algorithm can effectively improve the output signal to noise ratio and accuracy.

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23

Wu, Zhiwu, Tianfu Huang, Chunguang Wang, Xiang Wu, and Yanzhao Tu. "Transformer Fault Diagnosis and Location Method Based on Fault Tree Analysis." Scalable Computing: Practice and Experience 25, no. 5 (2024): 3587–93. http://dx.doi.org/10.12694/scpe.v25i5.3182.

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Fiber optical current transformer (FOCT) is widely used in power systems for fault diagnosis and analysis, which can improve its operational reliability. Construct fault modes and fault trees based on fault data of all fiber current transformers, and construct a fault feature space. Constructing a fault diagnosis expert system using fault trees and fault feature space clustering centers to achieve accurate diagnosis of fault types, patterns, and components. The proposed method was validated using fault data and case studies of all fiber current transformers in a regional power grid, and the results showed that: The on-site fault case is closest to the cluster center of drift deviation fault, so it belongs to drift deviation fault. Further extract the on-site maintenance report, which indicates that the operating temperature of the all fiber current transformer is relatively high. The diagnostic results of the fault diagnosis expert system for the faulty all fiber current transformer are consistent with the actual results on site, verifying the accuracy and reliability of this method.

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24

Arifin, Zainal, Muhammad Zulham, and Eko Prasetyo. "Impact of optical current transformer on protection scheme of hybrid transmission line." Indonesian Journal of Electrical Engineering and Computer Science 24, no. 1 (2021): 1. http://dx.doi.org/10.11591/ijeecs.v24.i1.pp1-11.

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Abstract:

Continuity of power transmission is important to ensure the reliability of the electricity supply. As most system faults are temporary, the auto reclose (AR) scheme has been used extensively to minimise the outage duration, prevent widespread outages, thus increase system stability. Meanwhile, the hybrid transmission line (HTL) combining overhead line (OHL) and high voltage cable has been introduced to provide an inexpensive solution for an urban power grid. Protecting HTL with a conventional protection system would forbid the operation of the AR scheme due to difficulty to ensure whether the fault occurred on the OHL or cable section. Therefore, the circulating current protection (CCP) scheme is used in the cable section to ensure the fault location and block the AR scheme. The technology of an optical current transformer (OCT) as one of the non-conventional instrument transformers (NCIT) has emerged to provide a solution to drawbacks on the conventional current transformer (CCT). Consequently, this paper investigated the impact of using OCT over the CCT for CCP of the HTL. The result shows that OCT could be used for CCP on much longer cable sections thus increase its reliability as the AR scheme can be used on longer or multiple cable section.

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25

Ikuta, S., K. Terai, M. Takahasi, H. Noda, T. Kaminishi, and T. Tamagawa. "The Optical Current Transformer with Twisted and Double Coated Fiber." IEEJ Transactions on Electronics, Information and Systems 118, no. 5 (1998): 669–77. http://dx.doi.org/10.1541/ieejeiss1987.118.5_669.

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26

Jia, Danping, Zhuo Yuan, Wei Lin, and Hongli San. "Research of DC Current Transformer Based on Optical Fiber Thermometry." Journal of Nanoelectronics and Optoelectronics 7, no. 2 (2012): 128–31. http://dx.doi.org/10.1166/jno.2012.1232.

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27

Zhao, Shuangshuang, Shihai Yang, Shufeng Lu, Mingming Chen, and Minrui Xu. "Method for online measurement of optical current transformer onsite errors." Measurement Science and Technology 27, no. 2 (2016): 025014. http://dx.doi.org/10.1088/0957-0233/27/2/025014.

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28

Temkina, Valentina, Andrei Medvedev, and Alexey Mayzel. "Research on the Methods and Algorithms Improving the Measurements Precision and Market Competitive Advantages of Fiber Optic Current Sensors." Sensors 20, no. 21 (2020): 5995. http://dx.doi.org/10.3390/s20215995.

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An electromagnetic instrument transformer is a common device used to measure large current values in high-voltage electrical networks; it has been in use for more than a century. However, the optical current transformer, a promising technology also known as a fiber optic current sensor (FOCS), offers increased safety and ease of operation, as well as the absence of errors caused by the magnetic circuit of legacy transformers. Although the FOCS scheme is well known and has been actively developed for over a quarter century, it has certain disadvantages that limit its use. This paper describes the authors’ efforts to solve these problems in order to make FOCS technology competitive and widely adopted. We upgraded the FOCS optical circuit, expanded the frequency band of the captured current signal, and reduced the solution’s cost. We designed new signal processing algorithms to compensate for errors caused by internal factors in the measurement circuit, as well as those caused by environmental influences. We developed an FOCS computer model based on the Jones matrix formalism to enhance the experimental debugging. It allowed us to define the requirements for elements of the optical circuit and its production accuracy.

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29

Yuan, Duan Lei, Zhou He, Hai Yan Wang, and Guang Chao Yan. "Theoretical Modeling and Error Analysis for Reflection Structure Fiber Optical Current Transformer." Applied Mechanics and Materials 511-512 (February 2014): 178–84. http://dx.doi.org/10.4028/www.scientific.net/amm.511-512.178.

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The optical structure and working principle of reflection structure fiber optical current sensor was presented, the Jones matrix of Polarizer, wave plate, fiber optical sensor head, theoretical mathematical model of the reflection structure fiber optical current sensor were established. based on the theoretical mathematical model, the polarization error was simulation analyzed, the simulation result shown that to be improve the accuracy of fiber optical current transformer, it should be reduced the polarizer axis angle error, ensure the consistency of the phase modulation for the two beams light, the shaft angle of the wave plate should be controlled within 0°±2°,and phase delay should be controlled within 90°±3°, the influence of linear birefringence effects can be effectively restrained by using a large number of circular birefringence. The simulation results provide a theoretical basis for the realization of reflection structure fiber optical current sensor.

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30

Li, Wang, Xia Kewen, and Weng Ling. "Model and Experimental Study on Optical Fiber CT Based on Terfenol-D." Sensors 20, no. 8 (2020): 2255. http://dx.doi.org/10.3390/s20082255.

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A nonlinear hysteresis model of magneto-mechanical-thermo coupling for Terfenol-D materials is presented according to Wiss ferromagnetic theory, thermodynamics relations and Jiles–Atherton model. Numerical calculation and experimental results show that the mode well reflects the magnetostrictive characteristics of Terfenol-D rod under the coupling of stress, temperature and magnetic field. A fiber Bragg grating current transformer based on Terfenol-D material is designed according to the strain sensing mechanism of fiber Bragg grating and the demodulation principle of unbalanced M–Z interferometer. The theoretical analysis and research on the working characteristics of the fiber current transformer under the influence of different prestressing force and bias current are carried out. The results are important for the design and application of the current transformer with the Terfenol-D material.

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31

Liu, Qing, Dai Yin Fu, Tian Kun Sun, and Dong Zhang. "RTDS-Based Real-Time Simulation Model of Fiber Optical Current Transformer." Applied Mechanics and Materials 448-453 (October 2013): 2578–82. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2578.

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This paper set up the real-time simulation model of FOCT by means of RTDS. The equivalent model of FOCTs digital closed-loop control system was created by simplifying that systems deviation and feedback .The temperature was also introduced in that model above according to the temperature change law of the optical fiber Verdet constant and λ/4 wave plate phase delay and the mathematical model about λ/4 wave plate parameters of the light intensity received by the detector. The results show that the real-time simulation model of FOCT is reasonable, and can simulate FOCTs steady state temperature characteristic. Its transient characteristic is not bad and it can be used for testing smart substations correlative equipment.

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32

HINO, Masami, Shinichi HASE, Kohji AJIKI, and Masataka AKAGI. "Optical Fiber Current Transformer Applications on Railway Electric Power Supply Systems." Quarterly Report of RTRI 45, no. 2 (2004): 59–63. http://dx.doi.org/10.2219/rtriqr.45.59.

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33

Xiong Yanling, 熊燕玲, 赵洪 Zhao Hong, 张剑 Zhang Jian, 赵海军 Zhao Haijun, and 汪淑容 Wang Shurong. "Research on Optical Current Transformer Based on the Fiber Bragg Grating." Acta Optica Sinica 30, no. 4 (2010): 949–53. http://dx.doi.org/10.3788/aos20103004.0949.

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34

Li, Dengyun, He Li, Dandan Zhang, Shi Mo, and Yongfeng Chai. "Dynamic simulation model of Fiber Optical Current Transformer considering error factors." Journal of Physics: Conference Series 1311 (September 2019): 012013. http://dx.doi.org/10.1088/1742-6596/1311/1/012013.

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35

Hayashiya, Hitoshi, Tatsuya Kumagai, Takeshi Endo, Shinichi Hase, Masataka Akagi, and Masami Hino. "Development of Optical Fiber Current Transformer for DC Railway Power System." IEEJ Transactions on Electronics, Information and Systems 126, no. 6 (2006): 736–43. http://dx.doi.org/10.1541/ieejeiss.126.736.

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36

Zhang, Ying, Shenghui Wang, Xuejie Wang, and Lei Qi. "Circuit Module Design of High-Voltage Side for Optical Current Transformer." International Journal of Smart Home 10, no. 1 (2016): 139–48. http://dx.doi.org/10.14257/ijsh.2016.10.1.14.

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37

Luo, Yun Han, Li Jia Xia, Cheng Liang, Jian Hui Yu, Jun Zhang, and Zhe Chen. "Compensation of Phase Modulation Disturbance in All Fiber-Optical Current Transformer." Applied Mechanics and Materials 291-294 (February 2013): 2317–21. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.2317.

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In order to improve measurement accuracy of all fiber-optical current transformer (FOCT), an improved demodulation algorithm was proposed for a sine modulation. The formula for effective phase modulation depth (EPMD) was firstly presented, and three kinds of potential external disturbance in EPMD were analyzed. To overcome the current measurement error induced by these EPMD disturbances, we put forward an improved algorithm for time-dependent measurement of EPMD by second- and fourth-order harmonic component of optoelectronic signal. A simulation experiment in different disturbance intensity were carried out, and the results showed that when measured current is between 200A~1500A,the proposed algorithm can enhance the current measurement accuracy by over 30 times than the conventional algorithm, and measurement relative deviation can be maintained below 0.2% if the disturbance intensity is below 5%.

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38

Didosyan, Yuri S., Hans Hauser, and Fritz Haberl. "Magneto-optical current transformer of high bandwidth and large temperature range." Sensors and Actuators A: Physical 92, no. 1-3 (2001): 67–73. http://dx.doi.org/10.1016/s0924-4247(01)00541-6.

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39

Wang, Yeteng, Yue Qiu, Fanrong Kong, and Hongda Zhang. "Research on nonlinear correction of giant magnetostrictive material optical current transformer." Energy Reports 8 (November 2022): 983–88. http://dx.doi.org/10.1016/j.egyr.2022.09.180.

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40

Li, Jingxiang, Hao Lai, Yuchao Liu, and Xiaopeng Xia. "Optical Electric Current Transformer for Monitoring Its Performance in the Substation." Journal of Nanoelectronics and Optoelectronics 18, no. 11 (2023): 1302–9. http://dx.doi.org/10.1166/jno.2023.3517.

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The optical electric current transformer (OECT) is an important measuring and protection equipment in the power system. Its accuracy and reliability are vital to the power system’s safe, reliable, and economical operation. Because the energy supply of a high-voltage side data acquisition system is the biggest obstacle in developing this kind of transformer, a low-power data acquisition system of OECT is designed from cost, reliability, accuracy, and practicability. In the design process, the low-power microcontroller MSP430 produced by TI company is used for control. Its rich on-chip and off-chip function modules and ultra-low power performance meet the system’s requirements. The 16-bit low-power high-speed chip ADS8325 is used as an A/D converter to ensure the instantaneity and accuracy of data acquisition and the low-power characteristics of the system. The optical fiber digital transmission system is utilized to achieve high/low voltage electrical isolation, and the low-power optical fiber transmission drive circuit is devised. After the main hardware design is completed, the software is adjusted and used in the electric energy monitoring of the substation. The test shows that the error of three-phase current and three-phase voltage is less than 2%. After setting the voltage amplitude, current amplitude, and power factor, the error of its active and reactive power is less than 2% after electric energy monitoring. After multiple harmonic tests, the measurement errors of voltage harmonics and current harmonics are smaller than 5%, that is, the measurement results of each index achieve high measurement accuracy.

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Ripka, Pavel, Karel Draxler, and Renata Styblikova. "Measurement of DC Currents in the Power Grid by Current Transformer." IEEE Transactions on Magnetics 49, no. 1 (2013): 73–76. http://dx.doi.org/10.1109/tmag.2012.2216862.

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Prochazka, R., J. Hlavacek, and K. Draxler. "Impulse Current Transformer With a Nanocrystalline Core." IEEE Transactions on Magnetics 49, no. 1 (2013): 77–80. http://dx.doi.org/10.1109/tmag.2012.2217734.

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Ripka, Pavel, Karel Draxler, and Renata Styblikova. "AC/DC Current Transformer With Single Winding." IEEE Transactions on Magnetics 50, no. 4 (2014): 1–4. http://dx.doi.org/10.1109/tmag.2013.2285878.

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Schulz, Carl A., StÉphane Duchesne, Daniel Roger, and Jean-NoËl Vincent. "Short Circuit Current Measurements Between Transformer Sheets." IEEE Transactions on Magnetics 46, no. 2 (2010): 536–39. http://dx.doi.org/10.1109/tmag.2009.2032820.

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Song, Tao. "A Novel Electronic Current Transformer for High Voltage Systems." Advanced Materials Research 588-589 (November 2012): 558–62. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.558.

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This paper illustrates a novel electronic current transformer (ECT) with a power source at ground potential. Employ the insulation structure of the traditional transformer insulated by SF6, the sensing unit with an air-core coil for measurement and protection transmits the electrical signal to the signal processing unit at the ground potential. Then the optical power source could be abandoned and the reliability is effectively enhanced. Utilizing mathematical models, designations and emulations have been done to compute the influence of the ambient temperature. Tests have been done and the experimental results show that this ECT meets the requirement of the 0.2s class for measurement and 5PTE for protection in IEC60044-8 respectively.

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Grim, Václav, Pavel Ripka, and Jan Bauer. "DC current sensor using switching-mode excited in-situ current transformer." Journal of Magnetism and Magnetic Materials 500 (April 2020): 166370. http://dx.doi.org/10.1016/j.jmmm.2019.166370.

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Wang, Yutian, Longjiang Zheng, Peiguo Hou, and Chunhai Hu. "Research on optically powered ultra current transformer." Optics and Lasers in Engineering 43, no. 10 (2005): 1145–50. http://dx.doi.org/10.1016/j.optlaseng.2004.06.022.

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Yamaguchi, H., K. Yoshikawa, M. Nakamura, T. Kataoka, and K. Kaiho. "Current Limiting Characteristics of Transformer Type Superconducting Fault Current Limiter." IEEE Transactions on Appiled Superconductivity 15, no. 2 (2005): 2106–9. http://dx.doi.org/10.1109/tasc.2005.849463.

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Yu Jia, 于佳, 张春熹 Zhang Chunxi, 王夏霄 Wang Xiaxiao, 李传生 Li Chuansheng, and 张宇宁 Zhang Yuning. "Influence of Loop Gain on Measurement Accuracy of Fiber Optical Current Transformer." Chinese Journal of Lasers 43, no. 9 (2016): 0910002. http://dx.doi.org/10.3788/cjl201643.0910002.

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Chen, Jun, Qingshan Xu, and Kai Wang. "Research and Application of Generator Protection Based on Fiber Optical Current Transformer." IEEE Access 8 (2020): 172405–11. http://dx.doi.org/10.1109/access.2020.3018734.

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