EFFECT OF HALF-WAVE RECTIFIED CURRENT ON READOUT OF ENERGY METER

Pavel Mlejnek - Petr Kašpar

   Paper deals with effect of half-wave rectified current on the measurement in energy meter. This type of current can be normally present in distribution network and does not cause any problem in active energy (kWh) consumption measurement. On the other hand it can be the cause of saturation of the high permeability core of dual core current transformers (but it is not the mai n topic of the paper). Moreover half-wave rectified current brings the increasing of the reactive power (VAr) and consequently also the apparent power (VA). It causes rising of losses in the conductors (joule heating). The simple energy meter, eg electromechanical, does not measure these values and the losses are hidden. In present day there are many problems with capacity of energetic distr ibution network. Therefore information about character of energy consumption can be very important.

Keywords: energy meter, electricity consumption, half-wave rectified current

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