Electronic electricity meter configured to correct for transformer inaccuracies

A method for compensating for instrument transformer induced measurement errors in an electronic electricity meter, the met including current sensors configured to generate a signal proportional to a sensed current supplied by an instrument transformer, voltage sensors configured to generate a signal proportional to a sensed voltage supplied by the instrument transformer, a microcomputer coupled to the current and voltage sensors and configured to control operation of the meter, and a memory coupled to the microcomputer and configured to store configuration and metering data, said method comprising the steps of:

• configuring the memory with calibration constants to compensate for instrument transformer ratio and phase angle errors;
• enabling the calibration constants via a software switch stored in the memory;
• and
• correcting measured metering quantities calculated by the microcomputer using the calibration constants.

An electronic electricity meter configured to:

• store a set of calibration constants in a non-volatile memory of said meter for instrument transformer ratio and phase angle error compensation;
• store a software switch for enabling or disabling the instrument transformer ratio and phase angle compensation in said meter;
• and
• meter a plurality of electrical quantities of a power source including an instrument transformer;
• and said meter having a microcomputer configured to selectively employ error compensation values, based on a value of the software switch and the calibration constants, the calibration constants configured to compensate for errors by instrument transformers, the calibration constants comprising at least one of a calculated instrument transformer gain coefficient for each voltage and current supplied by the instrument transformer to said meter, and an instrument transformer phase correction for each voltage current supplied by the instrument transformer to said meter.