Electrical transmission or interconnection systems – Conductor arrangements or structure
Patent
1981-08-31
1982-08-03
Askin, Laramie E.
Electrical transmission or interconnection systems
Conductor arrangements or structure
174 2, 174 40R, 307105, 307146, H02J 102, H02G 722, H02G 1300
Patent
active
043429238
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to means for transmitting electric energy, and more particularly to d.c. power transmission lines.
The invention is suitable for use in transmitting electric energy as well as information in the form of r.f. signals propagating over communication channels.
PRIOR ART
Known in the art are d.c. power transmission lines whose conductors are connected to a resonant circuit which is tuned in a manner that the fundamental harmonics caused by corona current are eliminated, with the result that corona effects are reduced (cf., for example, USSR Inventor's Certificate No. 285,083 published in the Bulletin of Discoveries, Inventions, Industrial Designs, Trade Marks, No. 33, 1971). The use of this resonant circuit, results, however, in loss of power transmitted through the line.
There is also a d.c. power transmission line incorporating two wire-type systems located above the line conductors which are connected to corresponding poles of a d.c. power supply.
These wire-type systems provide for lightning protection and include each two wires in a spaced relation to one another. One of the systems is located above that line conductor which is connected to the positive pole of the d.c. power supply, and the other is located above the line conductor connected to the negative pole of the d.c. power supply (cf., for example, USSR Inventor's Certificate No. 456,371, published in the Bulletin of Discoveries, Inventions, Industrial Designs, Trade Marks, No. 1, Jan. 5, 1975).
In the described d.c. power transmission line, it is not feasible, however, to provide each of the wire-type systems above the line conductors with two wires. It is known that streamers occurring at the positive pole are greatly responsible for interference. As a result, the wire-type system located above the line conductor connected to the negative pole works in more bad conditions since a positive potential is applied to it. On the other hand, that wire-type system which is located above the line conductor connected to the positive pole, is held at a negative potential and does not increase power loss due to corona or radio interference level.
DISCLOSURE OF THE INVENTION
An object of the invention is to provide a d.c. power transmission line offering a decreased power loss due to corona, a reduced radio interference level, and a saving of the amount of materials required for the manufacture of wire-type systems.
There is provided a d.c. power transmission line including two wire-type systems located, respectively, above line conductors which are connected to corresponding poles of a d.c. power supply, one of the wire-type systems, comprising at least two wires in a spaced relation to each other, being located, according to the invention, above one of said line conductors which is connected to a negative pole of said d.c. power supply, and a second one of the wire-type systems, comprising a single wire, being located above the line conductor connected to a positive pole of the d.c. power supply.
According to the invention, a considerable saving of the materials used in the manufacture of the lightning protection system is attained. In addition, power loss due to corona is reduced and radio interference level also.
BRIEF DESCRIPTION OF DRAWINGS
The invention will now be described in more detail with reference to an accompanying drawing which illustrates a section of a d.c. power transmission line, according to the invention.
BEST MODE OF CARRYING OUT THE INVENTION
The d.c. power transmission line comprises, according to the invention, line conductors 2,3 arranged on supports 1. The accompanying drawing shows a small section of the transmission line and a single support 1 only. The line conductors 2,3 are fixed using insulator strings 4,5, respectively. The conductors 2 are connected to a negative pole 6 of a d.c. power supply 7, and the conductors 3 are connected to a positive pole 8 of that power supply.
The transmission line comprises two wire-type systems which provide for lightning protection of the lin
Ishkin Vyacheslav K.
Kagan Veniamin G.
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