Modular electricity meter

摘要

Each phase (I1-3) of the three-phase current supply is connected to a separate transformer (14-18) primary (20) in a transformer module (40). Each transformer has a core (26) and secondary windings (22) and compensation windings (24) connected to a current measurement module (42). The individual secondary windings are connected to inverting amplifiers (32) and load resistors (34). The voltages (U1-3) across the transformer primaries are also measured. An additional module (44) drives the current measurement module.