D.C. current transformer circuits

Details D.C. current transformer circuits D.C. current transformer circuits

1984-03-19

1986-12-02

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

324127, 324133, G01R 3300, G01R 122, G01R 1914

Patent

active

046267778

ABSTRACT:
A D.C. current transformer (used for measuring D.C.) comprising a common primary winding and a pair of saturable magnetic cores on which respective secondary windings are wound and connected in opposite series in series to a source of alternating e.m.f., is provided with phase-sensitive device for determining the sense of the unknown D.C. in the primary winding. The phase sensitive device periodically senses and integrates the voltage (whose waveform is the -45.degree. to +45.degree. portion of a sine wave) across at least one of the secondary windings. The sense of the integrated waveform depends on whether said voltage is initially positive or negative, and is determined by the sense of the unknown D.C. in the primary winding. Preferably said voltage is sensed at each half cycle of said alternating e.m.f.

REFERENCES:
patent: 2657281 (1953-10-01), Kluz
patent: 2892155 (1959-06-01), Radus et al.
patent: 3135911 (1964-06-01), Van Allen
patent: 3351851 (1967-11-01), Darling
patent: 3699442 (1972-10-01), Riley
patent: 3855528 (1974-12-01), Brown
M. R. G. Petersen; "High Current Propulsion System"; 1979, IEEE Electronics Specialists Conference; pp. 379-384.

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