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This paper describes a novel reactive power meter realized by electronic circuits that determine successively the terms of the equation Q = Â¿n=1Â¿VrIrsinÂ¿r for n significant harmonics. The harmonic contributions to the total reactive power is determined by electronic simulation of the mathematical expression that sets the orthogonal condition of two functions in a periodical interval. Partial reactive power with its sign are stored and added in a circuit to get at the end of the cycle the total reactive power. A control system permits operation in a repetitive form.