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Monitoring system for the capacitor batteries of a three-phase filter circuit

  • US 4,419,621 A
  • Filed: 05/20/1981
  • Issued: 12/06/1983
  • Est. Priority Date: 05/27/1980
  • Status: Expired due to Fees
First Claim
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1. A monitoring system for the capacitor batteries of a three-phase filter circuit having three filter legs connected in a Y-circuit configuration, the Y-circuit node being connected to a reference potential, each capacitor battery being of the type having a plurality of parallel legs, each leg having a plurality of sectional capacitors connected in series with respective fuses, adjacent ones of the sectional capacitors being coupled to one another, the system further comprising means for determining variations in the magnitude and phase of a fundamental frequency component of a zero current flowing from the Y-circuit node of the three-phase filter circuit to the reference potential, said variations being evaluated to identify defective ones of the sectional capacitors in a capacitor battery.

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