Electrical transmission or interconnection systems – Anti-induction or coupling to other systems – Magnetic or electrostatic field control
Patent
1995-06-30
1998-10-20
Elms, Richard T.
Electrical transmission or interconnection systems
Anti-induction or coupling to other systems
Magnetic or electrostatic field control
333 12, H04B 330
Patent
active
058251014
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns an electrical line system for the transmission of low frequency electrical energy, with at least two conductors. In this instance, low frequencies are understood to be frequencies used as standard for railway traction current supply (162/3 Hz) and for general current supply (50 Hz or 60 Hz). However, the invention is also significant for line systems transmitting direct current, such as is used for example in the application referred to as the 700 kV network. This application can be seen as the boundary limit for the definition of "low frequency". The effects of the magnetic fields occurring as a consequence of such energy transmission systems can in fact also be disruptive. The invention is also of interest for those line systems in which for reasons of obtaining reduced transformer dimensions, for example, the operating frequency level is 40 kHz and above.
As made clear by the numerous bibliographical references in the book "Elektrischer Strom als Umweltfaktor" by Konig/Folkerts, Pflaum-Verlag Munich, 1992, the presumption today is that above all magnetic, but also to a certain degree, electrical fields generated by current supply can in various circumstances have a negative effect on living organisms.
The main aspects under discussion in this case are cross-country lines in the high-voltage system and intermediate-high-voltage system and domestic current supply, when these are configured as overhead lines. However, a comparable situation may arise in relation to magnetic and electrical fields in the domestic environment too, despite the fact that the currents in this sphere which give rise to fields are usually of considerably lower intensity. The reason why this situation may occur is that in the domestic environment, the distances between people and current-carrying lines are considerably shorter.
The task of the present invention is to counter these difficulties.
SUMMARY OF THE INVENTION
The electrical line system of the present invention is primarily characterized by: two main conductors for transmitting electrical energy and further comprising at least one auxiliary conductor extending parallel to the at least two main conductors; being phase-synchronized when the at least one auxiliary conductor carries current during operation of the electrical line system; conductor are arranged in a spatial arrangement relative to a first reference point in a first space extending parallel to the electrical line system, and wherein the currents flowing in the at least two main conductors and the at least one auxiliary conductor are selected such that a vector sum of the magnetic field components emanating from the at least two main conductors and the at least one auxiliary conductor is substantially equal to zero at the first reference point; and least two main conductors and the at least one auxiliary conductor relative to the first reference point and by a spatial distribution of the at least two main conductors and the at least one auxiliary conductor relative to the first reference point.
Preferably, at least one of the two main conductors is a split conductor that is split into at least two single conductors and at least one of the remaining main conductors is an unsplit conductor. One of the single conductors functions as the at least one auxiliary conductor. The spatial arrangement of the at least two single conductors is determined as a function of the currents flowing in the unsplit conductor and the at least two single conductors such that the magnetic field of the unsplit conductor is at least approximately compensated by the magnetic field of the single conductors in the first space extending parallel to the electrical line system.
Advantageously, the currents in the single conductors are in phase and the single conductors are positioned on opposite sides of the plane defined by a longitudinal extension of the at least one unsplit main conductor and the first reference point.
The ends of the single conductors are expediently short-circui
REFERENCES:
patent: 3869621 (1975-03-01), Wilson
patent: 5068543 (1991-11-01), Ohkawa
patent: 5360998 (1994-11-01), Walling
patent: 5391929 (1995-02-01), Kaylon et al.
patent: 5574250 (1996-11-01), Hardie et al.
Dr. Fischer Aktiengesellschaft
Elms Richard T.
LandOfFree
Electrical line system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electrical line system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrical line system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-247602