Research and Analysis on Measurement Error of Three-phase Electricity Meter with Magnetic Field Interference

The measurement accuracy of electricity meter is closely related to its working environment, and one of the important factors is the magnetic field. Aiming at the problem of wrong measurement of electricity meters under the interference of power frequency magnetic field and constant magnetic field, this paper first analyzes the influence mechanism of magnetic field on electricity meters through theory, then builds the simulation experimental devices of power frequency magnetic field and constant magnetic field of three-phase electricity meters, and finally compares and studies the measurement error of threephase electricity meters under different magnetic field conditions. The experimental results show that the greater the power frequency magnetic field is applied, the greater the measurement error of the three-phase electricity meter changes, and the 500 mT constant magnetic field can even make the three-phase electricity meter not measure. The research results can provide a basic basis for the protection of three-phase electricity meter against magnetic field interference.