This application note describes the different steps to calibrate a 3-phase 4-wire, 3-element energy meter based on the ADE7754.
The document details how to interface a 3-phase energy meter with different services (such as 3-phase 4-wire or delta) using the Analog Devices ADE7754. It explains the various meter architectures available in the field and the specific formulas used for energy calculation based on US ANSI C12.1 standards.
The guide provides instructions on configuring the ADE7754 registers, including OPMODE, GAIN, MMODE, and WAVMODE, to suit different meter connections. It further covers the theory of operation for active power-energy measurements, explaining how instantaneous power signals are processed and accumulated into energy registers.
The meter can interface with 3-phase 4-wire, 3-phase 3-wire, and 3-phase 4-wire with 2% elements services.
The meter provides active, reactive, and apparent energy calculations as well as power quality measurements, voltage rms, and current rms.
The default value of the OPMODE register after reset is 0x04.