Arrangement for measuring an electrical power or energy

An arrangement for measuring an electrical power or energy in a network having one or more phases comprising

• a voltage input for each phase,
• a transformer supplied with current for each phase and connected to an integrator with a high ohm input,
• a mark-space-amplitude modulator for each phase and in communication with the corresponding transformer via the corresponding integrator and in communication with the corresponding voltage input for producing marks and spaces whose integration is proportional to a produce of the voltage and current for the phase, each of said mark-space-amplitude modulators comprising a mark-space-modulator and a pulse amplitude modulator having two push-pull outputs,
• a current/frequency converter, an input of said current/frequency converter being connected to each of said push-pull outputs, said current/frequency converter including means for integrating marks and spaces present at the outputs of said pulse amplitude modulator, and
• a processing and display means connected to said current/frequency converter for displaying an output representative of an electrical power or energy.