Title :
Research on digital optical fiber current transformer with CT power supply
Author :
Kaicheng, Li ; Weibing, Hu ; Jianfeng, Liu ; Ming, Zhang
Author_Institution :
Coll. of Electr. & Electron. Eng., Huazhong Univ. of Sci. & Technol., Wuhan
Abstract :
A digital optical fiber current transformer (OCT) based on Rogowski coil and optical fiber transmission for use in high voltage systems is described in this paper. The technologies of signal sampling, processing and communication for the optical current transformer are introduced. The paper analyzes the present supply power techniques on high voltage side, and puts forward a new closed-loop regulating method through tailor-made small CT to obtain stable supply power. The experiment results verified that the designed power supply can operate normally as the current of bus is above 8A. The accuracy of current measurement is 0.2%.
Keywords :
closed loop systems; coils; current transformers; electric current measurement; electric sensing devices; fibre optic sensors; power supply circuits; signal sampling; Rogowski coil; closed-loop regulating method; current measurement; digital optical fiber current transformer; high voltage system; optical fiber transmission; signal processing; signal sampling; supply power technique; Circuit faults; Current measurement; Current transformers; Magnetic cores; Optical fibers; Optical saturation; Optical signal processing; Permeability; Power supplies; Voltage;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2008. CPEM 2008. Conference on
Conference_Location :
Broomfield, CO
Print_ISBN :
978-1-4244-2399-6
Electronic_ISBN :
978-1-4244-2400-9
DOI :
10.1109/CPEM.2008.4574847
