Calibration source for instruments to measure power and negative

Details Calibration source for instruments to measure power and negative Calibration source for instruments to measure power and negative

1979-11-26

1982-03-30

Shoop, William M.

Electric power conversion systems

Phase conversion without intermediate conversion to d.c.

307151, 328 24, 331 45, H02M 500

Patent

active

043227902

ABSTRACT:
A calibration signal source for instruments to measure power and negative sequence current of a multi-phase electric power generator. Separate signals are provided to represent load current for each phase of the generator ultimately to be tested, and to represent the instantaneous differences in voltage between each phase and a reference phase. The calibration signals are derived from a single sine wave by providing a plurality of phase shift and voltage difference networks. Means are provided for amplitude control and elimination of harmonic distortion of the single sine wave, and therefore the output calibration signals share these characteristics.

REFERENCES:
patent: 3144599 (1964-08-01), Brahm
patent: 3225282 (1965-12-01), Haas, Jr.
patent: 3832641 (1974-08-01), Herchenroeder
patent: 3886449 (1975-05-01), Wolfinger
patent: 4156186 (1979-05-01), Wolfinger

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