Patent ID: 6470283
Filing Date: 2002-10-22
Classification: G01R

Abstract:
Apparatus for providing indication of electric power; said apparatus comprising:(a) a voltage-sensing means for sensing a voltage signal; said voltage signal being provided in a non-contact manner by a capacitive coupling in close proximity to a power system conductor; said voltage signal providing information about a first voltage on said power system conductor; said voltage-sensing means being connected to said capacitive coupling; (b) a current-sensing means for sensing an input current; said input current being provided in a non-contact manner by a current transformer; said input current providing information about a primary electric current flowing on said power system conductor; said current-sensing means being connected to said current transformer; (c) a power supply means for deriving operating power from said input current; said power supply means being connected in series with said input current; (d) a microprocessor means for calculating one or more electric power parameters; said microprocessor means receiving information about said voltage signal from said voltage-sensing means and receiving information about said input current from said current-sensing means; said microprocessor means further utilizing operating power provided by said power supply means; (e) a communicating means for communicating said one or more electric power parameters; said communicating means receiving said one or more electric power parameters from said microprocessor means; said apparatus deriving both information and operating power from said input current; said apparatus requiring no other external source of operating power; said apparatus requiring no direct connection to any electric power system conductor.