Electrical transmission or interconnection systems – Plural load circuit systems – Common conductor or return type
Reexamination Certificate
2007-07-10
2007-07-10
Nguyen, Chau N. (Department: 2836)
Electrical transmission or interconnection systems
Plural load circuit systems
Common conductor or return type
Reexamination Certificate
active
10718516
ABSTRACT:
A control system for canceling load unbalance of a three-phase circuit includes phase current detectors for detecting phase currents caused to flow through a secondary circuit of a current transformer provided in high voltage distribution lines, respectively, phase change-over switches through which phases of the high voltage distribution lines, and primary sides of distribution transformers provided across high and low voltage distribution lines are connected to each other, a control center for, when a magnitude of a zero-phase current detected by the zero-phase current detector is larger than a predetermined value, on the basis of the phase currents, respectively, out putting a control signal so that the load of the phase having a maximum current appearing therein is changed over to the phase having a minimum current recognized therein, and a phase change-over slave station for controlling the phase change-over for the phase change-over switches in accordance with the control signal.
REFERENCES:
patent: 3555290 (1971-01-01), Ellermeyer
patent: 5604385 (1997-02-01), David
patent: 6018203 (2000-01-01), David et al.
patent: 6894468 (2005-05-01), Bretz et al.
patent: 2003/0002590 (2003-01-01), Kaku et al.
patent: 2004/0263147 (2004-12-01), Piesinger
patent: 61-266020 (1986-11-01), None
patent: 4-285413 (1992-10-01), None
patent: 05126881 (1993-05-01), None
patent: 11-205998 (1999-07-01), None
patent: 2000-514279 (2000-10-01), None
patent: WO 9637940 (1996-11-01), None
Electrical Engineering Handbook, Jan. 25, 1967, The Institute of Electrical Engineerings of Japan.
Matsumoto Tadashi
Mitani Mitsuru
Tange Seiji
Mitsubishi Denki & Kabushiki Kaisha
Nguyen Chau N.
Parries Dru
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