G - Physics – 01 – R
Patent
G - Physics
01
R
336/4, 324/48, 3
G01R 22/00 (2006.01) G01R 15/18 (2006.01) G01R 19/02 (2006.01)
Patent
CA 1268819
ABSTRACT OF THE DISCLOSURE The invention set forth herein is a three phase current sensor for providing a signal indicative to the three phase current and phase imbalance. The sensor comprises an electrically insulated current carrying conductor for each phase with one end of the conductor forming a line side connection and the other end of the conductor forming a load side connection. Each conductor is substantially U-shaped in configuration having leg portions and a bight portion. The conductors are posi- tioned proximate one another and have their bight portions overlapping forming a cylinder-like cup. The cup has a bottom portion and a wall portion, the bottom portion formed by the bight portions of the conductors and the wall portion formed by the leg portions of the conductors. The leg portions of each conductor is substantially parallel to the longitudinal axis of the cup and radially positioned approximately 60 from the leg portions of the other conduc- tors forming the cup. A signal generator is positioned within the interior of the cup and includes a pair of magnetic sensors. These sensors are positioned substan- tialiy coaxial to the longitudinal axis of the cup and substantially orthogonal with respect to one another. The sensors are used for sensing the rotating magnetic field produced by the current flow in the conductors of the cup. The output of the sensors of the signal generator when summed and squared have a dc term indicative of the sum of the squares of the current flowing in the conductors and an ac term indicative of the phase imbalance.
533620
Riches Mckenzie & Herbert Llp
Westinghouse Electric Corporation
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