Electricity: measuring and testing – Testing and calibrating electric meters
Patent
1989-09-01
1991-03-12
Wieder, Kenneth
Electricity: measuring and testing
Testing and calibrating electric meters
324130, 324142, 36457101, G01R 3102, G01R 3502, G01R 3504
Patent
active
049995693
ABSTRACT:
Apparatus for effecting field calibration of a portion of an electrical energy metering system, the system including a magneto-optic metering transducer (2,30) for producing an optical output signal representative of the current or voltage component of energy to be metered, and the portion of the system which is to be calibrated including a circuit unit (16,50) for receiving, when the metering system is in operation, the output signal produced by the metering transducer and a signal representative of the other component of the energy to be metered, and for generating an output signal representative of the energy delivered by the current and voltage components. The apparatus is composed of: a source (24) for providing calibrating alternating voltage and alternating current signals; a magneto-optic calibration transducer (22,54) for producing an optical output signal representative of one of the calibrating signals and for supplying its output signal to the circuit unit (16,50), in place of the output signal produced by the metering transducer (2,30); a conductor for supplying a signal representative of the other calibrating signal to the circuit unit (16,50), in place of the signal representative of the other component of the energy to be metered; and a metering device (26) connected to receive the calibrating signals provided by the source (24) and the output signal from the circuit unit (16,50) for providing an indication of the relation between the energy delivered by the calibrating signals and the energy represented by the output signal generated by the circuit unit (16,50) during a selected measuring interval.
REFERENCES:
patent: 2599378 (1952-06-01), Fleischmann
patent: 3305768 (1967-02-01), Koep
patent: 4061891 (1977-12-01), Pommer
patent: 4163938 (1979-08-01), Moore
patent: 4514686 (1985-04-01), Mayfield
patent: 4766370 (1988-08-01), Carr
patent: 4839819 (1989-06-01), Begin et al.
ABB Power T&D Company
Burns William J.
Rossi A. J.
Wieder Kenneth
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