Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1986-04-07
1987-10-13
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
310 68C, 336118, 336223, G01R 2200
Patent
active
047001313
ABSTRACT:
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 positioned 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 conductors 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 substantially 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.
REFERENCES:
patent: 3504283 (1970-03-01), Meservey
patent: 3886449 (1975-05-01), Wolfinger
patent: 4303881 (1981-12-01), Ezerwien et al.
patent: 4510548 (1985-04-01), Boothman
patent: 4513274 (1985-04-01), Holder
patent: 4544982 (1985-10-01), Boothman et al.
Burns W.
Karlsen Ernest F.
Moran M. J.
Westinghouse Electric Corp.
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