Apparatus and methods thereof for error correction in split core current transformers
First Claim
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1. A self-powered power sensor comprising:
- a split core adapted to fit around an alternate current power line oscillating at essentially a fixed frequency, the power line comprising a primary winding of a current transformer;
a second winding wound around a portion of the split core;
a resonance capacitor connected in parallel to the second winding, the resonance capacitor'"'"'s value being selected so that maximum resonance is achieved at low currents of the primary winding and at a low non-linear range of a magnetization curve of the split core;
a circuit connected to the secondary winding adapted to sample a current flowing there through and providing a samples'"'"' vector and further adapted to calibrate the samples'"'"' vector using at least a calibration coefficient; and
a wireless transmitter connected to the circuit, the wireless transmitter adapted to transmit the adapted samples'"'"' vector.
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Abstract
A self-powered power sensor (SPPS) measures electrical parameter measurements at points of interest, such as circuit breakers, machines, and the like. The SPPS which comprises of components that may require corrections, such as the errors induced by, but not limited to, the use of a split core mounted around a current carrier, and hence calibration coefficients are provided based on test, measurements and/or calculations respective of the devices. These coefficients may be stored in a database for retrieval when calibration of measurements received from a measuring device. In one embodiment at least one of the calibration coefficients is stored on SPPS.
96 Citations
17 Claims
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1. A self-powered power sensor comprising:
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a split core adapted to fit around an alternate current power line oscillating at essentially a fixed frequency, the power line comprising a primary winding of a current transformer; a second winding wound around a portion of the split core; a resonance capacitor connected in parallel to the second winding, the resonance capacitor'"'"'s value being selected so that maximum resonance is achieved at low currents of the primary winding and at a low non-linear range of a magnetization curve of the split core; a circuit connected to the secondary winding adapted to sample a current flowing there through and providing a samples'"'"' vector and further adapted to calibrate the samples'"'"' vector using at least a calibration coefficient; and a wireless transmitter connected to the circuit, the wireless transmitter adapted to transmit the adapted samples'"'"' vector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification