Abb Research Ltd.

Helmut Boehme

Rolf Paschen

Gerd Fitterer

Bernd Smailus

Norbert Graeber

An overhead line for electrical energy transmission includes at least one phase conductor which receives a phase current which has a phase and an amplitude. A compensation loop surrounds the at least one phase conductor. A compensation current which has a phase and an amplitude is fed into the compensation loop by a driving voltage. The phase and the amplitude of the compensation current is set with respect to the phase and the amplitude of the phase current flowing in the at least one phase conductor such that a magnetic flux produced by the compensation current counteracts a magnetic flux produced by the phase current. At least one additional loop surrounds the at least one phase conductor connected to the compensation loop. The driving voltage for the compensation current is produced in the compensation loop and in the at least one additional loop. The compensation loop and the at least one additional loop define the at least one phase conductor into at least two main sections. The compensation loop defines a first main section of the at least two main sections and the at least one additional loop defines at least one second section of the at least two main sections.

Overhead line for electric energy transmission

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.

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Nussloch, Germany

Helmut Boehme