Capacitive voltage transformers with electronic output

Details Capacitive voltage transformers with electronic output Capacitive voltage transformers with electronic output

1980-04-28

1982-04-27

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Capacitor protection

324126, H02H 716

Patent

active

043273904

ABSTRACT:
A capacitive voltage transformer of the type having voltage divider capacitors and an electronic amplifier connected to one of the divider capacitors includes circuitry for isolating the voltage divider capacitors in the event that primary power to the voltage divider is interrupted. The circuitry measures and compares the voltage at a terminal of one of the divider capacitors and the current through the divider. If primary power to the voltage divider is interrupted, the capacitor voltage remains high while the divider current goes to zero, and the circuitry acts to isolate (such as through relay controlled switches) the divider capacitors from the electronic amplifier. This prevents any distortion from appearing in the voltages across the divider capacitors and prevents transients from developing at the input to the electronic amplifier.

REFERENCES:
patent: 3870926 (1975-03-01), Hughes
patent: 4196388 (1980-04-01), Weller et al.

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