Electrical energy meter with a precision integrator for current

Details Electrical energy meter with a precision integrator for current Electrical energy meter with a precision integrator for current

1992-04-06

1994-03-29

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324103R, 324107, G01R 2106

Patent

active

052988570

ABSTRACT:
A current measurement circuit for an electrical energy meter of the type having an inductive current pickup which generates a signal proportional to the derivative of current with respect to time in an electrical power line. An underdamped integrator is provided which compensates for nonideal phase characteristics of the inductive current pickup including a phase deviation from 90.degree. at the nominal line frequency. The integrator has a transfer function with a magnitude peak at a frequency below the line frequency and with a phase shift deviating from 90.degree. at the line frequency.

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