×

Power monitoring

  • US 5,930,092 A
  • Filed: 01/17/1992
  • Issued: 07/27/1999
  • Est. Priority Date: 01/17/1992
  • Status: Expired due to Fees
First Claim
Patent Images

1. Monitoring apparatus for monitoring power exchanged with electrical apparatus comprising:

  • at least first and second conductors connected to said electrical apparatus,a multiplier having a current input coupled to at least one of said conductors for receiving a current signal representative of the current carried thereby, a voltage input coupled to said at least one conductor for receiving a voltage signal representative of the voltage between said first and second conductors and a power output for providing a power signal representative of the product of said current and voltage signal,and trip circuitry coupled to said power output for providing a trip signal only when said power signal is outside a predetermined range,and further including absolute value circuitry for providing an absolute value signal representative of the absolute value of said power signal.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×