H - Electricity – 02 – J
Patent
H - Electricity
02
J
354/150, 324/33
H02J 3/18 (2006.01) G01R 19/02 (2006.01) G01R 21/00 (2006.01) G06G 7/20 (2006.01)
Patent
CA 1068824
ABSTRACT OF THE DISCLOSURE A method and an apparatus for carrying out the method for rapid acquisition and handling of root means squares of electric measuring values in single- or multi-phase a.c. mains, where these values are present in the form of time- dependent values measuring the alternating current and/or the a.c. voltage of the respective a.c. mains, are converted in each given case into two intermediate values, shifted in phase by 90° relative to each other, and are fed into a computing circuit, at the output of which can be picked up analog d.c. signals, indicating the reactive or the actual power, or the r.m.s. value of the a.c. voltage or current, depending on the type of comput- ing circuit being used, and serving as a nominal value, the improvement comprising the steps of comparing the nominal value with an applied actual value, integrating the difference signal between the nominal and actual values in a regulator unit to form a control signal, periodically reading the value of the control signal at the output of the regulator unit, transmitting said control signal to a final control element, and adjusting the value of the control signal during the course of one or a fraction of one cycle of the a.c. mains frequency.
236952
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