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AssigneeLandis & Gyr Energy Management, Inc.
InventorsJames W. Milligan, John T. Voisine
Estimating the term…
An apparatus for electrically setting the overload compensating magnetic reluctance in a single phase induction watthour meter includes a moveable magnetic shunt positioned adjacent the poles of a current core of a current stator circuit. An electrical parameter of the current stator circuit is sensed and changes in this parameter are used to set the air gap between the magnetic shunt and the current core poles. In one embodiment, a programmable controller controls a motor to move the shunt in response to variation of the sensed electrical parameter from a predetermined value. In one method, the sensed electrical parameter is the voltage induced in a first current coil when a second current coil is energized. In other methods, the sensed electrical parameter is the flux induced in the magnetic shunt or the self inductance of a current coil. A further method is to determine the ration of a harmonic voltage to a fundamental voltage which corresponds to the desired degree of magnetic saturation of the overload compensator at the control point.
An apparatus for electrically setting the overload compensation of a current stator circuit for an induction type watthour meter having a current core wound with at least one current coil, and a magnetic shunt positioned adjacent to poles of the current core, comprising:
A method for electrically setting the overload compensation in a current stator circuit of an induction watthour meter, the method comprising the steps of:
Dependencies are inferred from the claim text.