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

H - Electricity

02

H

324/59

H02H 7/16 (2006.01) G01R 31/00 (2006.01) H02H 3/50 (2006.01)

Patent

CA 1157098

ABSTRACT A circuit for monitoring the voltage stress of a capacitor which produces an over-stress indicator signal responsive to the over-voltage his- tory 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 respons- ive 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-volt- age ranges.

356539

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