Current transformer based on optical fiber fluorescent thermometry

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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Hybrid optical fiber current transformer based on DSP and ultra-low-power. consumption micro-controller

Proceedings. International Conference on Power System Technology ◽

10.1109/icpst.2002.1047579 ◽

2003 ◽

Cited By ~ 3

Author(s):

Shang Qiufeng ◽

Qi Yincheng ◽

Xie Zhiyuan ◽

Chen Bo ◽

Yang Yihan

Keyword(s):

Power Consumption ◽

Optical Fiber ◽

Low Power ◽

Current Transformer ◽

Low Power Consumption ◽

Ultra Low Power

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Research on digital optical fiber current transformer with CT power supply

2008 Conference on Precision Electromagnetic Measurements Digest ◽

10.1109/cpem.2008.4574847 ◽

2008 ◽

Cited By ~ 1

Author(s):

Li Kaicheng ◽

Hu Weibing ◽

Liu Jianfeng ◽

Zhang Ming

Keyword(s):

Optical Fiber ◽

Power Supply ◽

Current Transformer

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Performance Evaluation of Optical Fiber Current Transformer based Over-current Protection

FES Journal of Engineering Sciences ◽

10.52981/fjes.v8i1.8 ◽

2019 ◽

Vol 8 (1) ◽

pp. 40-47

Author(s):

Sulieman Eldoud Bashir Ahmed

Keyword(s):

Optical Fiber ◽

Calibration Procedure ◽

Current Transformer ◽

Superior Performance ◽

System Protection ◽

Operational Characteristics ◽

Low Weight ◽

New Feature ◽

Processing Block ◽

Conventional Ct

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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Application of Special Optical Fiber Sensing Technology in New Generation of Smart Substation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.986-987.1191 ◽

2014 ◽

Vol 986-987 ◽

pp. 1191-1195

Author(s):

Rui Rui Yang ◽

Hui Yuan Yang ◽

Wei Chi Ou

Keyword(s):

Optical Fiber ◽

Fiber Bragg Grating ◽

Current Transformer ◽

Bragg Grating ◽

Distributed Temperature Sensing ◽

Fiber Sensing ◽

Sensing Technology ◽

Optical Fiber Sensing ◽

New Generation ◽

Smart Substation

The new generation of smart substation puts forward higher requirements to sensing technology. Based on the needs of these requirements, four kinds of special optical fiber sensing technology in power systems were researched: all-optical current transformer, distributed temperature sensing technology, fiber grating vibration sensing technology and fiber Bragg grating sensing technology. These kinds of optical fiber sensing technology for the new generation of smart substation to enhance its performance were analyzed. Finally, based on the fiber Bragg grating sensing technology, the online oil and winding temperature monitoring system was constructed for the new generation of smart substation.

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