Page 422 - Sensors and Control Systems in Manufacturing

376
Cha p te r
Se v e n

FIGURE 7.50 Fault locating system based on current and phase in ground wire.

multiplexing, three sensor signals can be transmitted over a single
fiber. Seven sensors, three at each side of a substation and one at the
substation itself, can monitor one substation on the power line, using
one fiber in the OPGW.
Another system uses current transformers to pick up lightning
current and thus detect lightning strikes. The signal is transmitted to
a central detection point using the OPGW. Every sensor has its own
OPGW fiber. This system is on a 273-kV power line in Japan.
The OPGW opens the possibility for using all kinds of sensors along
the transmission line. These sensors may not only be used for locating
faults, but also for monitoring structural integrity. The use of optical
time-domain reflectometry (OTDR) combined with passive intrinsic
(distributed) sensors along the OPGW has future potential for provid-
ing a convenient and powerful monitoring method for power lines.

Further Reading
Bailey Control Systems, Wickliffe, Ohio.
Bartman, R. K., B. R. Youmans, and N. M. Nerheim. “Integrated Optics
Implementation of a Fiber Optic Rotation Sensor: Analysis and Development,”
Proc. SPIE, 719, 122–134.
Berthold, J. W., “Industrial Applications of Optical Fiber Sensors,” Fiber Optic and
Laser Sensors III, Proc. SPIE, 566, 37–44.
Carrol, R., C. D. Coccoli, D. Cardelli, and G. T. Coate, “The Passive Resonator Fiber
Optic Gyro and Comparison to the Interferometer Fiber Gyro,” Proc. SPIE, 719,
169–177 (1986).
Chappel, A. (ed.), Optoelectronics—Theory and Practice, McGraw-Hill, New York,
1978.
Crane, R. M., A. B. Macander, D. W. Taylor, and J. Gagorik, “Fiber Optics for a Damage
Assessment System for Fiber Reinforced Plastic Composite Structures,” Rev.
Progress in Quantitative NDE, 2B, Plenum Press, New York, 1419–1430, 1982.
Doeblin, E. O., Measurement Systems—Application and Design, 4th ed., McGraw-Hill,
New York, 1990.
Fields, J. N., C. K. Asawa, O. G. Ramer, and M. K. Barnoski, “Fiber Optic Pressure
Sensor,” J. Acoust. Soc. Am., 67, 816 (1980).