ELECTRICITY MEASUREMENT APPARATUS AND METHOD

摘要

An electricity meter includes two spaced-apart parallel conductors (A, B) for current flow in a single direction. A magnetic field is induced in the space between the conductors. A magnetic field sensor or sensors (H1, H2) in the space are used to measure electricity flow. Preferably there are two sensors (H1, H2) positioned so that their output signals include similar components due to an external magnetic field (if present). These components can be removed by differencing so as to avoid external magnetic field causing errors in electricity measurement.