Kabushiki Kaisha Meidensha

Tokyo Denryoku Kabushiki Kaisha

Mituhiro Furuse

Tomoyoshi Ochiai

Takeshi Hayashi

Apparatus for monitoring two sinusoidal electric quantities of a common period, comprises two similarly timed samplers, an arithmetic unit for combining, in accordance with a preselected relation, three consecutive samples of each electric quantity so as to produce an output signal which is independent of time and phase relations between the sampling pulses and the respective quantities. The output signal may be determined solely by peak values of the respective quantities, phase difference between the electric quantities, and timing period. The apparatus further comprises a discriminator circuit having a reference level and responsive to the output signal for producing a signal for use in monitoring the electric quantities.

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Tokyo, Japan

Mituhiro Furuse