Electrical engineers' wattmeter with analogue multiplier

摘要

An electrical engineers' wattmeter making it possible to measure single-phase or balanced three-phase active power and/or balanced three-phase reactive power and/or voltage and/or current, comprising connection terminals (1 to 6), a voltage divider (8) providing an analogue signal of the instantaneous voltage, and display means (12), characterised in that it comprises terminals (1 to 4) for parallel connection of the phase line or lines and the neutral, two terminals (5 and 6) for series connection of a predetermined phase line for current detection, these terminals being connected by a primary lead (7), a Hall effect current sensor (9) coupled to the primary lead (7) so as to provide an analogue signal of they instantaneous current corresponding to the actual current, and a power circuit (10) forming an analogue signal corresponding to the power to be measured, and comprising an analogue multiplier (11). IMAGE