Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1975-04-17
1976-05-11
Corcoran, Robert J.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
G01R 2702
Patent
active
039566960
ABSTRACT:
Apparatus for measuring the DC resistance of large inductors. A series resistance is connected in series with the inductor and the combination is connected in parallel with a capacitor and a variable resistance. A DC potential is applied to the parallel network to produce a voltage drop across the series resistance, the variable resistance, and the inductor. These voltages are applied to a processing circuit which subtracts the variable resistance voltage from the inductor voltage and divides the difference voltage by the series resistance voltage. The resulting voltage is proportional to the internal resistance of the inductor and does not vary with time when the variable resistance is adjusted to make the time constant of the inductive branch equal to the time constant of the capacitive branch of the parallel network. A differentiation circuit is used to indicate when the variable resistance is set at the proper value to balance the time constants.
REFERENCES:
patent: 2772395 (1956-11-01), Runaldue
patent: 3207980 (1965-09-01), Shockroo
patent: 3210657 (1965-10-01), Flanagan
patent: 3445764 (1969-05-01), Tedeschi
Corcoran Robert J.
McHale C. L.
Westinghouse Electric Corporation
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