Vector kva meter

Details Vector kva meter Vector kva meter

G - Physics

01

R

354/21, 324/70

G01R 21/00 (2006.01)

Patent

CA 1181849

IMPROVED VECTOR KVA METER ABSTRACT OF THE DISCLOSURE A meter apparatus for determining Vector VA demand, and other electrical quantities, over a predetermined time period t uses a watthour meter and a Q-hour meter with pulse initiators. The time period is divided into a plurality of subintervals and the VAh or other quantity is determined for each subinterval .DELTA.t. Thus .DELTA.VAh is determined using the relationship Image where .DELTA.Wh is the output from the watthour meter and .DELTA.VARh is a value for .DELTA. VAR hours determined generally from the relationship .DELTA. VARh = Image where Qh represents Q-hours and 0 represents an angle by which the voltage vectors are rotated for measurement by a Q meter of Q-hours. The values of .DELTA.VAh for the subintervals in the time period are summed to provide total VAh for the time period, and from which can be calculated the Vector VA demand for the time period. By making the determination based on relatively short subintervals, the inaccuracies introduced by changing power factor over the time period are reduced or eliminated for all practical purposes.

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