Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1990-10-26
1992-07-07
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
324117R, G01R 1900, G01R 33032
Patent
active
051286084
ABSTRACT:
An optical instrument transformer can measure both current and voltage of the primary conductor. Measurement of current is made through modulation effect of a light signal by the optical magnetic-field sensor, and measurement of voltage is made through modulation effect of a light signal by the optical electric-field sensor, by measuring the voltage between a conductor member and an upper flange the of the a bushing, which has a value divided in a dividing ratio determined by the capacitance between the conductor member (4a) and the upper flange and the capacitance between the upper flange and ground.
REFERENCES:
patent: 3324393 (1967-06-01), Casey et al.
patent: 3413055 (1968-11-01), De Jorbo
patent: 4894609 (1990-01-01), Fujiki et al.
K. Gotoh et al. 1245 "Development of Apparatus for Detecting Segmented Region of a Transforming Station," 1990 National Convention IEE Japan; pp. 9-193, 9-194.
H. Yamanaka et al. G3-52 "Development of Apparatus for Monitoring Fult Point by an Optical Current Transformer in an Air Transforming Station", Record of the 1989 Kansai-Section Joint Convention of Institute of Electrical Engineering Japan, pp. G130.
P. Johnson, "A Magneto-Optic Current Transducer," IEEE 89 SM 732-9 PWRD, pp. 1-7.
K. Kyuma et al., "Fiber-Optic Voltage Sensor Using Electro-Optic Bi.sub.12 GeO.sub.20 Single Crystal," Proceedings of the 2nd sensor Symposium 1982, pp. 33-37.
IEEE Transactions on Power Delivery, vol. 5, No. 2, Apr. 1990: "A High-Accuracy Optical Current Transformer for Electric Power Systems".
IEEE Journal of Quantum Electronics, vol. QE-18, No. 10, Oct. 1982: "Fiber Optic Measuring System for Electric Current by Using a Magnetooptic Sensor".
Karlsen Ernest F.
Mitsubishi Denki & Kabushiki Kaisha
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