Monitoring system for a capacitor battery in an ac voltage...

Details Monitoring system for a capacitor battery in an ac voltage... Monitoring system for a capacitor battery in an ac voltage...

G - Physics

01

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324/35

G01R 23/00 (2006.01) G01R 11/52 (2006.01) G01R 27/00 (2006.01) H02H 3/36 (2006.01) H02H 3/44 (2006.01) H02H 7/16 (2006.01)

Patent

CA 1189144

ABSTRACT A monitoring system for a capacitor battery, the capacitor battery having a plurality of parallel legs, each with a plurality of sectional capacitors connected in series with fuses. Adjacent ones of the sectional capacitors are connected to one another by continuous cross lines. Electronic simulation circuitry is provided for producing a signal corresponding to the fundamental frequency component of a simulated capacitor voltage. A transient comparator circuit compares the fundamental frequency component of the simulated capacitor voltage with the fundamental frequency component of a measured capacitor voltage. Only rapid changes between the simulated capacitor voltage and the measured capacitor voltage are signaled as indicative of failures of one or more sectional capacitors in the capacitor battery. Slowly occurring voltage changes, which may correspond to variations in ambient temperature, do not lead to fault signaling.

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