Research of DC Current Transformer Based on Optical Fiber Thermometry

2012 ◽  
Vol 7 (2) ◽  
pp. 128-131 ◽  
Author(s):  
Danping Jia ◽  
Zhuo Yuan ◽  
Wei Lin ◽  
Hongli San
Keyword(s):  
Optical Fiber ◽  
Current Transformer ◽  
Dc Current

Research of DC Current Measurement Technology Based on Optical Fiber Thermometry

2011 ◽  
Vol 128-129 ◽  
pp. 686-689 ◽  
Author(s):  
Dan Ping Jia ◽  
Yang Wang ◽  
Song Lin ◽  
Quan Kang Wei
Keyword(s):  
Thin Film ◽  
Optical Fiber ◽  
Measurement System ◽  
Low Voltage ◽  
Low Cost ◽  
Electric Heating ◽  
Measurement Technology ◽  
Voltage Measurement ◽  
Film Sensor ◽  
Dc Current

Thin film sensor has the advantages of small size and low cost, which has become a research hotspot in recent years. A measurement system of passive optical fiber DC current sensor based on the thin film sensors is designed in this article. Designs of electric-heating converter, heating-light converter and low-voltage measurement display system are introduced in detail. Experimental results indicate that the general linear correlation between the time constant of fluorescent lifetime and the voltage across the thin film resistor. The feasibility of measurement system is verified via the results of the experiment.

Current transformer based on optical fiber fluorescent thermometry

2008 ◽  
Author(s):  
Danping Jia ◽  
Ting Jia ◽  
Liang He ◽  
Yingwen Lin
Keyword(s):  
Optical Fiber ◽  
Current Transformer

Error Calculating and Compensating Method of All-Optical Fiber Current Transformer in ± 10 kV DC Distribution Network

2019 ◽  
Vol 14 (11) ◽  
pp. 1606-1615
Author(s):  
Jicheng Yu ◽  
Changxi Yue ◽  
Jun Li ◽  
Dengyun Li ◽  
He Li
Keyword(s):  
Optical Fiber ◽  
Distribution Network ◽  
Current Transformer ◽  
Electromagnetic Current ◽  
Current Transformers ◽  
Wave Plate ◽  
Remote Transmission ◽  
Dc Distribution ◽  
All Optical ◽  
Database Technology

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.

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

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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