Landis & Gyr Metering, Inc.

Siemens Transmission & Distribution. LLC

Gregory L Dykstal

John T Voisine

Byron J Slater

Christopher L Anderson

A phase adjustment circuit is provided for use in an inductive drive utility meter that employs a current stator and a rotating disk. The phase adjustment circuit includes an impedance circuit and a first current limiting device. The impedance circuit has at least first and second terminals, and is disposed in a flux inducing relationship with the current stator such that the flux within the current stator induces a voltage across the first and second terminals of the impedance circuit. The first current limiting device has a first bias threshold, and is connected between the first and second terminals of the impedance circuit. The current limiting device is operable to inhibit current flow in a first direction through the impedance circuit based on whether the voltage induced on said impedance circuit exceeds the first bias threshold. The current flow through the impedance circuit then induces a compensation flux density component onto the current stator, which in turn affects registration of the meter.

Watt hour meter registration calibration method and apparatus

A solid-state AC energy consumption meter includes an array of AC signal transducers which provide voltage and current signals to a watt transducer chip. The watt transducer chip operates on the multi-phase voltage and current signals to produce AC energy consumption data which is fed to a register for visual display. In one aspect of the invention, a calibrating resistive component is placed in series with the input to the primary coil of the potential transformer for each phase. The value of the resistive component is calibrated to produce an appropriate change in the phase angle difference between the potential transformer secondary voltage and current transformer secondary current. More particularly, the addition of the resistance of the primary of the potential transformer provides the necessary amount of phase lead to the potential transformer to account for this phase error difference.

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Lafayette, IN, United States of America

Gregory L Dykstal