Current sensing system
AssigneeGeneral Electric Company
InventorsJohn Michael Kern, Glen Peter Koste, Charles Erklin Seeley, Todd Ryan Tolliver
Life of this patent
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Abstract
A current sensing system comprises a current transformer; a burden resistor connected across a secondary of the current transformer; a piezo-optic sensor coupled to the burden resistor, comprising a piezoelectric transducer, an optical fiber and a first optical filter with a first bandwidth; and an optical interrogator, configured for sending an originating signal to the first bandwidth optical filter and receiving a resulting data signal and a second optical filter with a second bandwidth for filtering the resulting data signal.
Claims42
A system for obtaining currents in high voltage environments, comprising:
- a current transformer for sensing current flowing in a conductor, the current transformer including a secondary winding;
- a burden resistor coupled to the secondary winding;
- a piezo-optic sensor coupled to the burden resistor, the piezo-optic sensor including a piezoelectric transducer, an optical fiber and a first optical filter with a first bandwidth;
- and
- an optical interrogator coupled to the optical fiber, the optical interrogator configured for sending a broadband originating signal to the first optical filter and receiving a wavelength modulated resulting data signal corresponding to a sensed current from the first optical filter, the optical interrogator comprising a second optical filter with a fixed second bandwidth for filtering the resulting data signal to generate an amplitude modulated resulting data signal corresponding to the sensed current, the first bandwidth and the second bandwidth at least partially overlapping.
A system for obtaining currents in high voltage environments, comprising:
- a plurality of current transformers for sensing current, each including a secondary winding;
- a plurality of burden resistors, each coupled to a respective one of the secondary windings;
- an optical fiber;
- a plurality of piezo-optic sensors, each coupled to a respective one of the plurality of burden resistors and each including the optical fiber, a piezoelectric transducer and a first optical filter with a first bandwidth;
- and
- an optical interrogator coupled to the optical fiber, the optical interrogator configured for sending a broadband originating signal to the plurality of first optical filters and receiving wavelength modulated resulting data signal from the plurality of first optical filters, the optical interrogator comprising a plurality of second optical filters with a respective fixed second bandwidth for filtering the wavelength modulated resulting data signal to generate a plurality of amplitude modulated resulting data signals, bandwidths of respective first and second optical filters at least partially overlapping.
A system for obtaining currents in high voltage environments, comprising:
- a plurality of current transformers for sensing current, the current transformers each including a secondary winding;
- a plurality of burden resistors coupled to the respective ones of the plurality of secondary windings of the secondary transformers;
- a piezo-optic sensor module comprising a housing and a plurality of piezoelectric transducers, each transducer coupled to a respective one of the plurality of burden resistors;
- and
- an optical interrogator module coupled to the piezo-optic sensor module, wherein the optical interrogator is configured to interrogate the piezo-optic sensor module using a broadband originating signal, amplitude modulate a data signal from the piezo-optic sensor module and detect an amplitude modulated data signal.
Dependencies are inferred from the claim text.