DWQ .. DIN
electronic, for alternating and three-phase current, for use with current transformers secondary 1 A and 5 A
Power meters electronic, for alternating and three-phase current, for use with current transformers secondary 1 A and 5 A
Power meters are used for measuring active and reactive power in case of alternating current and three phase power system. Sinusoidal and non-sinusoidal quantities may be measured. Power meters show the import active power or reactive power for standard types, or the import and export active power or reactive power, if the zero point is offset, i.e. in case of bidirectional energy flow.
Power meters are manufactured according to EN 60 051 as well as according to the other relevant VDE and EN regulations. The display is indicated by a moving coil system. The accuracy amounts to 1,5 % referred to the full scale. The parameters to be measured are transmitted to the analog multiplier via internal current transformers and voltage dividers. The instantaneous values of current and voltage are then multiplied and formed in a direct voltage matching the active power or reactive power. The auxiliary voltage for the supply of the electronics is gained from the measuring voltage. If the measuring voltage fluctuates by more than +/-20 % of the rated voltage, a separate auxiliary voltage is required. The electrical connection is done using a terminal block for cross sections up to 4 mm2.