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Title: Phase-modulated fiber-optic current transformer/voltage transformer

Abstract

This report summarizes the results of an investigation into the use of phase-modulated fiber-optic sensing techniques for the measurement of current and voltage in non-revenue aerial and underground distribution systems. The phase-modulated Fiber-Optic Current Transformer/Voltage Transformers (FOCT/VT) described uses single-mode fiber and conventional telecommunications components. The heart of the FOCT/VT system is a fiber-optic interferometer. The current of voltage signals of interest are converted to phase modulation of the light in the interferometer. This is accomplished with a piezoelectric (PZT) element where optical fiber in one arm of the interferometer is attached. Since the PZT is electrostrictive, an applied voltage results in a change in dimensions of the PZT, thereby straining the optical fiber. The strain in the optical fiber produces a corresponding phase modulation of the light propagating through the fiber. The interferometer converts the phase modulation to intensity modulation proportional to the amplitude of the current or voltage signal. In either case, a detection bandwidth exceeding 1 kHz was achieved. A dynamic range of 90 dB was demonstrated which corresponds to a measurement span of 1.34 to 43,000 Amps and 29 V to 979 kV for the case of the current and voltage sensors, respectively. A compact, clamp-onmore » sensor package suitable for hot-stick installation in the field was designed which houses the current and voltage sensors and their associated optical components. A market investigation was conducted which estimated the market potential of the FOCT/VT and determined that the FOCT/VT has viable applications in distributions automation. 15 figs., 2 tabs.« less

Authors:
 [1]
  1. Optical Technologies, Inc., Herndon, VA (United States)
Publication Date:
Research Org.:
Electric Power Research Inst., Palo Alto, CA (United States); Optical Technologies, Inc., Herndon, VA (United States)
Sponsoring Org.:
EPRI; Electric Power Research Inst., Palo Alto, CA (United States)
OSTI Identifier:
5572813
Report Number(s):
EPRI-EL-7421
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; 47 OTHER INSTRUMENTATION; INTERFEROMETERS; MODULATION; TRANSFORMERS; DESIGN; AUTOMATION; ELECTRIC CURRENTS; ELECTRIC POTENTIAL; FIBER OPTICS; MARKET; MEASURING INSTRUMENTS; OPTICAL FIBERS; PIEZOELECTRICITY; POWER TRANSMISSION; POWER TRANSMISSION LINES; STRAINS; CURRENTS; ELECTRICAL EQUIPMENT; ELECTRICITY; EQUIPMENT; FIBERS; 240201* - Power System Networks, Transmission & Distribution- AC Systems- (1990-); 240301 - Power Transmission Lines & Cables- Power Cables- (1990-); 440600 - Optical Instrumentation- (1990-)

Citation Formats

Davis, C M. Phase-modulated fiber-optic current transformer/voltage transformer. United States: N. p., 1991. Web.
Davis, C M. Phase-modulated fiber-optic current transformer/voltage transformer. United States.
Davis, C M. Mon . "Phase-modulated fiber-optic current transformer/voltage transformer". United States.
@article{osti_5572813,
title = {Phase-modulated fiber-optic current transformer/voltage transformer},
author = {Davis, C M},
abstractNote = {This report summarizes the results of an investigation into the use of phase-modulated fiber-optic sensing techniques for the measurement of current and voltage in non-revenue aerial and underground distribution systems. The phase-modulated Fiber-Optic Current Transformer/Voltage Transformers (FOCT/VT) described uses single-mode fiber and conventional telecommunications components. The heart of the FOCT/VT system is a fiber-optic interferometer. The current of voltage signals of interest are converted to phase modulation of the light in the interferometer. This is accomplished with a piezoelectric (PZT) element where optical fiber in one arm of the interferometer is attached. Since the PZT is electrostrictive, an applied voltage results in a change in dimensions of the PZT, thereby straining the optical fiber. The strain in the optical fiber produces a corresponding phase modulation of the light propagating through the fiber. The interferometer converts the phase modulation to intensity modulation proportional to the amplitude of the current or voltage signal. In either case, a detection bandwidth exceeding 1 kHz was achieved. A dynamic range of 90 dB was demonstrated which corresponds to a measurement span of 1.34 to 43,000 Amps and 29 V to 979 kV for the case of the current and voltage sensors, respectively. A compact, clamp-on sensor package suitable for hot-stick installation in the field was designed which houses the current and voltage sensors and their associated optical components. A market investigation was conducted which estimated the market potential of the FOCT/VT and determined that the FOCT/VT has viable applications in distributions automation. 15 figs., 2 tabs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {7}
}

Technical Report:
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