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US 4,366,392 AGranted
Aerial power transmission line with lightning protection wires designed also to transmit rf signals
OwnerVyacheslav K. Ishkininventor
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OwnerVyacheslav K. Ishkininventor
Estimating the term…
An aerial power transmission line comprises phase wires suspended from supports and a lightning protection system designed also to convey information in the form of r-f signals and having at least two wires 4 and 5 spaced a certain distance apart and forming an r-f data transmission channel. The wires 4 and 5 of the lightning protection system are suspended from the supports 3 one under the other in a substantially vertical plane.
An aerial power transmission line comprising three phase transmission wires suspended from supports and spaced from each other in the horizontal direction and a lightning protection system comprising two pairs of ground wires, said ground wires being insulated from each other and arranged to form an rf channel for conveying information in the form of rf signals, the ground wires of each pair being suspended by a string of insulators from said supports one under the other, one pair of said wires being located above said three phase transmission wires and in a vertical plane between the middle one, and one of the outside phase wires, the other pair of said ground wires being located above the transmission wires in a vertical plane between the middle one and the other of said outside phase wires.
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
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Term ended 3 Sep 2000 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention relates to means for transmitting electric energy from one location to another and, in particular, to aerial power transmission lines.
Known in the art are aerial power transmission lines comprising phase wires suspended from supports and lightning protection cables secured to said supports and designed also to convey information in the form of r-f signals (cf., for example, USSR Inventors Certificate No. 399,030, published in Discoveries, Inventions, Industrial Designs, Trade Marks, No. 38, Sept. 27, 1973, Bykhovski Ya. L.).
Such aerial power transmission lines, particularly those designed to transmit voltages of the order or 1000 kV and higher, have been generally unsatisfactory due to substantial power losses associated with the corona condition and a high radio-interference level, another disadvantage being the effect of noise level in r-f channels over the lightning protection cables thereof.
The other objects and advantages of the present invention will become apparent from the discussion of a specific embodiment thereof, taken in conjunction with the accompanying drawings, wherein:
FIG. 1 is a length of an aerial power transmission line, according to the invention;
FIG. 2 illustrates frequency versus cross attenuation of a signal in the power transmission line, according to the invention.
Turning initially to FIG. 1, the aerial power transmission line forming the subject of the present invention comprises phase wires 1 (FIG. 1) secured to supports 3 by the use of a string of insulators 2. For simplicity, only a short length of the aerial power transmission line with one support 3 is shown in the drawing.
In addition, the hereinproposed aerial power transmission line includes a lightning protection system designed also to convey information in the form of r-f signals.
The lightning protection system has two pairs of wires 4 and 5 secured to the same support 3 by the use of a string of insulators 6.