Electrical transmission or interconnection systems – Anti-induction or coupling to other systems – Magnetic or electrostatic field control
Patent
1997-10-30
1999-07-06
Elms, Richard T.
Electrical transmission or interconnection systems
Anti-induction or coupling to other systems
Magnetic or electrostatic field control
174 32, 333 12, H04B 330
Patent
active
059201304
ABSTRACT:
An overhead line for electrical energy transmission, includes three phase conductors of a three-phase system. The three phase conductors are disposed vertically one above the other and define an upper phase conductor and a lower phase conductor. At least one additional compensation loop having a first conductor, a second conductor, and vertical connecting conductors surround the three phase conductors. The first conductor of the at least one additional compensation loop is disposed parallel to and above the upper phase conductor. The second conductor of the at least one additional compensation loop is disposed parallel to and below the lower phase conductor. The first and the second phase conductors are connected to one another via vertical connecting conductors. A compensation current is fed into the at least one compensation loop. The compensation current has a phase and an amplitude set with respect to a phase and an amplitude of a phase current flowing in the three phase conductors such that a magnetic flux produced by the compensation current counteracts a magnetic flux produced by the phase current flowing in the three phase conductors. There is also a control device and a current source for producing and controlling the amplitude and the phase of the compensation current. The control device drives the current source. A magnetic field measuring device is connected to the control device for detecting the magnetic field under the overhead line.
REFERENCES:
patent: 3801877 (1974-04-01), Griese et al.
patent: 5360998 (1994-11-01), Walling
patent: 5465012 (1995-11-01), Dunnam
patent: 5616969 (1997-04-01), Morava
patent: 5656872 (1997-08-01), Lee
patent: 5777401 (1998-07-01), Sjodin
Boehme Helmut
Fitterer Gerd
Graeber Norbert
Paschen Rolf
ABB Research Ltd
Elms Richard T.
Greenberg Laurence A.
Lerner Herbert L.
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