Process and apparatus for comparing in real time phase differenc

Details Process and apparatus for comparing in real time phase differenc Process and apparatus for comparing in real time phase differenc

1994-10-20

1996-11-19

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324 7613, 324 7638, 324 7677, 324771, G01K 2500

Patent

active

055766188

ABSTRACT:
A numerical comparator is disclosed. The numerical comparator employs numerical techniques based upon the behavior of the cylinder unit to compare phasors in real time. In one application of this invention, the torque signal generated by the numerical comparator, M.sub.k+1, is employed to determine whether a fault has occurred in a transmission line. Another application involves employing the output M.sub.k+1 to determine the direction of power flow in the transmission line. In yet another application, the output M.sub.k+1 is used to determine whether a voltage or current has exceeded a predetermined threshold.

REFERENCES:
patent: 3740491 (1973-06-01), Cook et al.
patent: 4851782 (1989-07-01), Jeerings et al.
patent: 4908825 (1990-03-01), Vea
patent: 4968960 (1990-11-01), Bouhenguel et al.
patent: 5151866 (1992-09-01), Glaser et al.
patent: 5438254 (1995-08-01), Ho et al.
patent: 5451956 (1995-09-01), Lochhead

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