Circuit for monitoring the voltage stress of a capacitor

Details Circuit for monitoring the voltage stress of a capacitor Circuit for monitoring the voltage stress of a capacitor

1980-07-03

1982-04-20

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Capacitor protection

361 15, 361 86, 361 89, H02H 716

Patent

active

043262309

ABSTRACT:
A circuit for monitoring the voltage stress of a capacitor which produces an over-stress indicator signal responsive to the over-voltage history of the capacitor. If the measured voltage stress of the capacitor exceeds a predetermined over-voltage value, a characteristic-curve generator, having a predetermined transfer function, produces an output signal which is responsive to the measured voltage stress of the capacitor and the transfer function of the characteristic-curve generator. This signal is combined with a further signal which is responsive to a predetermined permissible continuous operation voltage value. The combined signals are conducted to an integrator having a predetermined integration time constant for producing an overload signal. The overload signal at the output of the integrator is a measure of the state of stress of the capacitor. Circuitry may be provided for disconnecting the capacitor from a transmission line in response to the output signal of the integrator. Also, plural capacitor voltage stress monitoring stages may be combined to monitor the capacitor voltage stress in a plurality of over-voltage ranges.

REFERENCES:
patent: 3870927 (1975-03-01), Hughes
patent: 4104687 (1978-08-01), Zulaski

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