Effect of Modulation Error on All Optical Fiber Current Transformers

Zhengping Wang, Yuekun Wang, Shuai Sun

Science School, Harbin Engineering University, Harbin, China.

DOI: 10.4236/jst.2012.24024                

Abstract

For actively modulated In-line Sagnac interferential all optic fiber current transformers (AOFCTs), the accuracies are directly affected by the amplitude of the modulation signal. In order to deeply undertand the function of the modulator, a theoretical model of modulation effect to AOFCTs is built up in this paper. The effect of the amplitude of the modulation signal to the output intensity of AOFCTs is theoretically formulated and numerical calculated. The results show that the modulation voltage variation could affect the output accuracies significantly. This might be some references on the investigation for practical applications of AOFCTs.

Keywords

Electronic Current Transformer; All Optical Fiber Current Transformer; Faraday Effect; Active Modulation; Modulation Error

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	L. R. Veeser and G. W. Day, “Faraday Effect Current Sensing Using a Sagnac Interferometer with a 3 × 3 Coupler,” Proceedings of the 7th Optical Fibre Sensors Conference, Sydney, 2-6 December 1990, pp. 325-328.
[2]	K. B. Rochford, G. W. Day and P. R. Forman, “Polarization Dependence of Response Functions in 3 × 3 Sagnac Optical Fiber Current Sensors,” Journal of Lightwave Technology, Vol. 12, No. 8, 1994, 1504-1509. doi:10.1109/50.317541
[3]	M. C. Oh, J. K. Seo, K. J. Kim, H. Kim, J. W. Kim and W. S. Chu, “Optical Current Sensors Consisting of Polymeric Waveguide Components,” Journal of Lightwave Technology, Vol. 28, No. 12, 2010, pp. 1851-1857. doi:10.1109/JLT.2010.2049093
[4]	V. H. Ortiz, J. L. Flores and G. García-Torales, “A Review on Optical Current Transducers for Power System Metering,” Proceedings of Fiber Optic Sensors and Applications V, Boston, 10-12 September 2007, pp. 6770181-67701811. doi:10.1117/12.735082
[5]	P. R. Watekar, S. Ju, S. A. Kim, S. Jeong, Y. Kim and W. T. Han, “Development of a Highly Sensitive Compact Sized Optical Fiber Current Sensor,” Optics Express, Vol. 18, No. 16, 2010, pp.17096-17105. doi:10.1364/OE.18.017096
[6]	I. S. Nikolay, V. R. Maksim, K. C. Yurii, P. G. Vladimir, I. S. Aleksandr, K. M. Sergey and M. K. Nikita, “Interferometric Fiber-Optic Electric Current Sensor for Industrial Application,” Key Engineering Materials, Vol. 437, 2010, pp. 314-318. doi:10.4028/www.scientific.net/KEM.437.314
[7]	Y. N. Ning, Z. P. Wang, A. W. Palmer, K. T. V. Grattan and D. A. Jackson, “Recent Progress in Optical Current Sensing Techniques,” Review Science. Instruments, Vol. 66, No. 5, 1995, pp. 3097-3111. doi:10.1063/1.1145537
[8]	Z. P. Wang, Y. K. Wang and S. Sun, “Inquiry about All Fiber-Optic Electronic Current Transformer Technology,” Optics and Optoelectronic Technology, in press.
[9]	J. Blake, P. Tantaswadi and R. T. Carvalho, “In-Line Sagnac Interferometer Current Sensor,” IEEE Transactions on Power Delivery, Vol. 11, No. 1, 1996, pp. 116-121. doi:10.1109/61.484007
[10]	I. G. Clarke, “Temperature-Stable Spun Elliptical-Core Optical-Fiber Current Transducer,” Optics Letters, Vol. 18, No. 2, 1993, pp. 158-160. doi:10.1364/OL.18.000158
[11]	J. Blake, P. Tantaswadi and R. T. de Carvalho, “In-Line Sagnac Interferometer Current Sensor,” IEEE Transactions on Power Delivery, Vol. 11, No. 1, 1996, pp. 116-121. doi:10.1109/61.484007
[12]	A. H. Rose, Z. B. Ren and G. W. Day, “Twisting and Annealing Optical Fiber for Current Sensors,” Journal of Lightwave Technology, Vol. 14, No. 11, 1996, pp. 2492-2498.
[13]	S. X. Short, J. U. de Arruda, A. A. Tselikov and J. Blake, “Stable Scale Factor Performance of an In-line Sagnac Interferometer Current Sensor,” The 12th International Conference on Optical Fiber Sensors, Washington DC, 28-31 October, 1997, pp. 100-103.
[14]	K. Bohnert, P. Gabus, J. Nehring and H. Br?ndle “Temperature and Vibration Insensitive Fiber-Optic Current Sensor,” Journal of Lightwave Technology, Vol. 20, No. 2, 2002, pp. 267-276. doi:10.1109/50.983241
[15]	R. Wüest, A. Frank, S. Wiesendanger, P. Gabus, Urs E. Meier, J. Nehring and K. Bohnert, “Influence of Residual Fiber Birefringence and Temperature on the High-Current Performance of an Interferometric Fiber-Optic Current Sensor,” Conference on Optical Sensors, Prague, 20-22 April, 2009, pp.73560K1-73560K8
[16]	Y. K. Wang and Z. P. Wang, “The Effect of Temperature Characteristic of Faraday Rotator to Passively Demodulated All Optical Fiber Current Transformers,” Power System Technology, in press.
[17]	Y. X. Zhao, X. Y. Li, C. X. Liu and Y. L. Hao, “Comparative Research in Signal Processing of FOG,” Journal of Chinese Inertial Technology, Vol. 11, No. 2, 2003, pp. 52-56.
[18]	G. Q. Liu, Z. Q. Le and D. F. Shen, “Magnetooptics,” Shanghai Science and Technology Press, Shanghai, 2001.
[19]	International Electrotechnical Commission, International Standard IEC 60044-8, Instrument Transformers, Part 8, Electrical Current Transformers, 2002.
[20]	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and Standardization Administration of the People’s Republic of China. National Standard of People’s Republic of China, Instrument Transformers, Part 8: Electrical current transformers, 2007.