CA1048117A - High-tension overhead lines - Google Patents
High-tension overhead linesInfo
- Publication number
- CA1048117A CA1048117A CA233,318A CA233318A CA1048117A CA 1048117 A CA1048117 A CA 1048117A CA 233318 A CA233318 A CA 233318A CA 1048117 A CA1048117 A CA 1048117A
- Authority
- CA
- Canada
- Prior art keywords
- tubular member
- section
- heat
- inner tubular
- conductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
Abstract
ABSTRACT
A method of increasing the power handling capacity and economy of a high-tension overhead line consists in passing a coolant, such as water, through the line so as to remove heat therefrom. The heat is then extracted from the coolant and is usefully employed, for instance to heat nearby buildings. An overhead cable for performing the method comprises a duck for passage of the coolant surrounded by an electric conductor.
A method of increasing the power handling capacity and economy of a high-tension overhead line consists in passing a coolant, such as water, through the line so as to remove heat therefrom. The heat is then extracted from the coolant and is usefully employed, for instance to heat nearby buildings. An overhead cable for performing the method comprises a duck for passage of the coolant surrounded by an electric conductor.
Description
1~4~
The invention relates to high--tension overhead lines and, in particular, to methods of increasing the power handling -capacity and economy thereof.
.. Conventional overhead lines cannot be operated above alimiting temperature of about 40~, and consequently cannot be overloaded by the power to be transmitted, on account of the d need to avoid excessive sagging brought about the thermal expansion of stretches suspended between supportin~ towers.
Although such overhead lines, which usually consist of materials of high coefficient of thermal expansion, are loaded beyond - their "natural" or surge impedance, this can only be done up to the limit of their thermal capacity.
A further drawback of a conventional overhead line ./ , resides in the fact that the electric current heat losses inseparable from power transmission are dissipated in the _ surrounding atmosphere and can therefore no longer be made use of. The continually increasing need for energy gives rise however to the requirement for high power transmission over long ~ distances, which can no longer be met by the conventional overhead lines.
An object of the invention is to enable transmission -. of a high power energy level exceeding the power handling capacity of conventional overhead lines to be obtained, whilst at the same time increasing the economy of power trans-mission b~ overhead lines.
The present invention consists in a method of increasing the power handling capacity and the economy :~ 30 . . . . . . .
' ' ' ' . . . ~: , , ~4~7 of a high-tension overhead line, in which a coolant is passed through the overhead line so as to remove a substantial portion of the heat dissipated therein, the heat removed by the coolant being usefully employed.
Owing to the coolant flowing through the overhead line the power handling capacity thereof can be increased to a multiple of the previous level, without the risk of any expansion beyond the prohibited limiting value~ At the same -time the economy of such an installation is increased by a not inconsid-erable amount owing to the fact that the heat taken up by thecoolant is employed for a useful purpose. It has been found to be particularly advantageous to use a liquid coolant, and particularly water, since liquids in general have better heat transfer characteristics and particularly a higher heat absorbing capacity than vapours or gases, and water not only _ ~ possesses the requisite properties but in addition is easily accessible everywhere and i5 particularly cheap. ~evertheless it may be of advantage in special circumstances to use gases or vapours as the coolant, and particularly such as have vapour-izing temperatures which lie within the operational range of the overhead line, such as for example that supplied under the trademark Freon-12 (C C12 F2).
The coolant may be supplied to or taken from the high-tension overhead line at intervals of at least 5 kilometres, is fed to a consumer installation, for `' :
' J~ 30 ., .
The invention relates to high--tension overhead lines and, in particular, to methods of increasing the power handling -capacity and economy thereof.
.. Conventional overhead lines cannot be operated above alimiting temperature of about 40~, and consequently cannot be overloaded by the power to be transmitted, on account of the d need to avoid excessive sagging brought about the thermal expansion of stretches suspended between supportin~ towers.
Although such overhead lines, which usually consist of materials of high coefficient of thermal expansion, are loaded beyond - their "natural" or surge impedance, this can only be done up to the limit of their thermal capacity.
A further drawback of a conventional overhead line ./ , resides in the fact that the electric current heat losses inseparable from power transmission are dissipated in the _ surrounding atmosphere and can therefore no longer be made use of. The continually increasing need for energy gives rise however to the requirement for high power transmission over long ~ distances, which can no longer be met by the conventional overhead lines.
An object of the invention is to enable transmission -. of a high power energy level exceeding the power handling capacity of conventional overhead lines to be obtained, whilst at the same time increasing the economy of power trans-mission b~ overhead lines.
The present invention consists in a method of increasing the power handling capacity and the economy :~ 30 . . . . . . .
' ' ' ' . . . ~: , , ~4~7 of a high-tension overhead line, in which a coolant is passed through the overhead line so as to remove a substantial portion of the heat dissipated therein, the heat removed by the coolant being usefully employed.
Owing to the coolant flowing through the overhead line the power handling capacity thereof can be increased to a multiple of the previous level, without the risk of any expansion beyond the prohibited limiting value~ At the same -time the economy of such an installation is increased by a not inconsid-erable amount owing to the fact that the heat taken up by thecoolant is employed for a useful purpose. It has been found to be particularly advantageous to use a liquid coolant, and particularly water, since liquids in general have better heat transfer characteristics and particularly a higher heat absorbing capacity than vapours or gases, and water not only _ ~ possesses the requisite properties but in addition is easily accessible everywhere and i5 particularly cheap. ~evertheless it may be of advantage in special circumstances to use gases or vapours as the coolant, and particularly such as have vapour-izing temperatures which lie within the operational range of the overhead line, such as for example that supplied under the trademark Freon-12 (C C12 F2).
The coolant may be supplied to or taken from the high-tension overhead line at intervals of at least 5 kilometres, is fed to a consumer installation, for `' :
' J~ 30 ., .
2--example a heating plant, is cooled do~n therein and then passed on to the next stretch of overhead line.
~he coolant may be supplied or withdrawn in this manner through earthed connecting lines, which are - 5 suitably insulated from the conductor itself, so that there is no risk of any appreciable current flow to earth. The spaclng apart of the feed and take off points of -the coolant may be selected having regard to the effective utilization of the hea-t and can be a multiple of the specified value, provided always that the particular coolant flow rate selected and therefore ~ the velocity~ pressure thereof is so adapted to the - prevailing conditions that the thermal limits of the coolant, and therefore the permissible sag of th0 line, are not exceeded and that inadequate heating up of the coolant, which would nullif`y the economy of the heat utilization plar-t, is avoided~
~he invention also consists in a high-tension over~
head line for carryi~g out the method according to the i~ention, comprising ~or the passage of coolant :
di~posed within a flexible or ~endable electric conductor. It is of vital i~!portance to the practical usefullness of the conductor that the latter should ~ be sufficiently flexible, i~9. that considerable ! 25 length thereof must be adapted after manufacture to be wo-~nd onto a drum for the purpose of transport to -the assembly site where it can be unwound again without .; .
.. . .
:-. . . ~ .
~L8~L7 damage, which procedure must if necessary be capable of being repeated several times, for example during subsequent alterations to the stretch of cable. It must moreover be capable of withstandin~ the not inconsiderable bending and tensile stresses due to its o~ weight and to sagging which are set up during assembly and in operation, and also due to the forces acting externally thereon.
In a preferred embodime~t of the overhead line the duct comprises a thin-walled flexible pipe of corrosion-and erosion-resistant material, for example of stainless steel or the like or of a plastics material having a high resistance to abrasion, said duct being surrounded by the electrical conductor. In this connection the flexibility of the overhead line for the purpose of tra~sport on a drum is ensured both by suitable dimensioning of the electrical conductor and in particular to the duct having regard to the mechanical strength of the materials employed, so that ; 20 both the resistance to abrasion a~d the stability to corrosion of the material selected for the duct are of special and vital importarr,e to the useful life of the overhead line.
Preferably the electrical condùctor consists at least partly of a solid conductor, of for example aluminium or the like, the coolant duct being made use o~ in such case as the member withstanding tensile stresses.
This affords the advantage inter alia o~ a considerably .....
41!3~17 .. simplified method of manufacturin~ the overhead line, which can be done by extruding the electrical conductor around the duct, since by this means the custom.ary arrangement of special tension members of steel wire or the like in overhead cables is unnecessary, as the duct particularly when it consists of alloy steel is dimensioned so as to wi~thstand all tensile and . bending stresses that can occur. ~he flexibility of the overhead line for the purpose of drum transport is ensured in this case, apart from the dimensioning of the conductor and of the duct by the fact that the electrical conductor is not rigidly fixed to the duct~
~: so that the forces set up during the bending and specially during the coiling of the line around a drum can be suitably distributed a~d very considerably reduced by movement of the conductor relatively to the duct.
The inner side of the electrical conductor ac~.jacent the pipe includes recesses substantially uniformly . 20 distributed around its periphery and extending in the longitudinal direction of the conductor, the total surface area of the inner lands of the conductor between the recesses ill contact with the pipe amounting to at least one third of the surface area of the duct.
This feature of the invention very considerably reduces - the adhesion of the conductor to the duct and especially the mutual friction during the rel~tive movement of the two parts described above, whilst ~t the same time - 5 ~
. .
~1~48~
retaining the contact surfaces sufficient for the requisite heat transfer from the conductor to the duct or from the latter to the coolant. At the same ti.me the recesses in the inner surface of -the conductor extending longitudinally through the entire length : thereof afford the advantage that any damage to the duct can be detected in time and obviated by replacement : of the section of overhead line concerned, before the conductor itself is exposed to any perceptible degree to the action of the coolant.
~he electrical conductor may consist at least partly ;. of plain wires or braided or stranded bundles of wires, -~ at least one concentric layer of which is twistad : together leaving a central cavity or is braided with a suitable length of lay around the duct enclosing the coolant cha~nel or around the .solid tubular conductor.
. ~hese embodiments are particularly suitable for overhead lines having an internal duct consisting for example of an abrasion resistant plastics material, the tensile strength of which is relatively low and which is not :~ - strong enough to withstand the ~oroes concerned, In this case the stranded portion of the conductor, consisting of elements of high tensile s-trength, for example a layer of so-called stalcu (copper-clad steel) wires, constitutes the element of the overhead wire withstanding the bulk of the tensile forces to be met with. ~'he arrangement of stranded wire elements, al.one or in conjunction with a solid conductor may also be of ~Q~
advantage when a conductor of specially large cross-section or a particularly flexible conductor is required.
A preferred embodiment of the inve~tion will be described with reference to the accompanying drawings, in which:
Figure 1 shows diagrammatically the la~out of a high-tension overhead line working at a high power e~ergy level in accordance with the me-thod of the invention; and ~igure 2 is a cross-section through the pverhead line of Figure 1.
As shown in Figure 1, an overhead line 1 is secured to supporting structures 2 or 3, which are suitably spaced apart. ~he spacings are as large as possible consistent with the weight to be supported and the permissible sag of the line and also with the nature of the particular terrain involved, ~nd may be spaced by up to several hundred metres. A single suitably insulated suspension device 4 for the line 1 is provided on supporting structures 2 arranged along the line. At points for supplying and -taking o~f the coolant and for cooling it down, supporting structures
~he coolant may be supplied or withdrawn in this manner through earthed connecting lines, which are - 5 suitably insulated from the conductor itself, so that there is no risk of any appreciable current flow to earth. The spaclng apart of the feed and take off points of -the coolant may be selected having regard to the effective utilization of the hea-t and can be a multiple of the specified value, provided always that the particular coolant flow rate selected and therefore ~ the velocity~ pressure thereof is so adapted to the - prevailing conditions that the thermal limits of the coolant, and therefore the permissible sag of th0 line, are not exceeded and that inadequate heating up of the coolant, which would nullif`y the economy of the heat utilization plar-t, is avoided~
~he invention also consists in a high-tension over~
head line for carryi~g out the method according to the i~ention, comprising ~or the passage of coolant :
di~posed within a flexible or ~endable electric conductor. It is of vital i~!portance to the practical usefullness of the conductor that the latter should ~ be sufficiently flexible, i~9. that considerable ! 25 length thereof must be adapted after manufacture to be wo-~nd onto a drum for the purpose of transport to -the assembly site where it can be unwound again without .; .
.. . .
:-. . . ~ .
~L8~L7 damage, which procedure must if necessary be capable of being repeated several times, for example during subsequent alterations to the stretch of cable. It must moreover be capable of withstandin~ the not inconsiderable bending and tensile stresses due to its o~ weight and to sagging which are set up during assembly and in operation, and also due to the forces acting externally thereon.
In a preferred embodime~t of the overhead line the duct comprises a thin-walled flexible pipe of corrosion-and erosion-resistant material, for example of stainless steel or the like or of a plastics material having a high resistance to abrasion, said duct being surrounded by the electrical conductor. In this connection the flexibility of the overhead line for the purpose of tra~sport on a drum is ensured both by suitable dimensioning of the electrical conductor and in particular to the duct having regard to the mechanical strength of the materials employed, so that ; 20 both the resistance to abrasion a~d the stability to corrosion of the material selected for the duct are of special and vital importarr,e to the useful life of the overhead line.
Preferably the electrical condùctor consists at least partly of a solid conductor, of for example aluminium or the like, the coolant duct being made use o~ in such case as the member withstanding tensile stresses.
This affords the advantage inter alia o~ a considerably .....
41!3~17 .. simplified method of manufacturin~ the overhead line, which can be done by extruding the electrical conductor around the duct, since by this means the custom.ary arrangement of special tension members of steel wire or the like in overhead cables is unnecessary, as the duct particularly when it consists of alloy steel is dimensioned so as to wi~thstand all tensile and . bending stresses that can occur. ~he flexibility of the overhead line for the purpose of drum transport is ensured in this case, apart from the dimensioning of the conductor and of the duct by the fact that the electrical conductor is not rigidly fixed to the duct~
~: so that the forces set up during the bending and specially during the coiling of the line around a drum can be suitably distributed a~d very considerably reduced by movement of the conductor relatively to the duct.
The inner side of the electrical conductor ac~.jacent the pipe includes recesses substantially uniformly . 20 distributed around its periphery and extending in the longitudinal direction of the conductor, the total surface area of the inner lands of the conductor between the recesses ill contact with the pipe amounting to at least one third of the surface area of the duct.
This feature of the invention very considerably reduces - the adhesion of the conductor to the duct and especially the mutual friction during the rel~tive movement of the two parts described above, whilst ~t the same time - 5 ~
. .
~1~48~
retaining the contact surfaces sufficient for the requisite heat transfer from the conductor to the duct or from the latter to the coolant. At the same ti.me the recesses in the inner surface of -the conductor extending longitudinally through the entire length : thereof afford the advantage that any damage to the duct can be detected in time and obviated by replacement : of the section of overhead line concerned, before the conductor itself is exposed to any perceptible degree to the action of the coolant.
~he electrical conductor may consist at least partly ;. of plain wires or braided or stranded bundles of wires, -~ at least one concentric layer of which is twistad : together leaving a central cavity or is braided with a suitable length of lay around the duct enclosing the coolant cha~nel or around the .solid tubular conductor.
. ~hese embodiments are particularly suitable for overhead lines having an internal duct consisting for example of an abrasion resistant plastics material, the tensile strength of which is relatively low and which is not :~ - strong enough to withstand the ~oroes concerned, In this case the stranded portion of the conductor, consisting of elements of high tensile s-trength, for example a layer of so-called stalcu (copper-clad steel) wires, constitutes the element of the overhead wire withstanding the bulk of the tensile forces to be met with. ~'he arrangement of stranded wire elements, al.one or in conjunction with a solid conductor may also be of ~Q~
advantage when a conductor of specially large cross-section or a particularly flexible conductor is required.
A preferred embodiment of the inve~tion will be described with reference to the accompanying drawings, in which:
Figure 1 shows diagrammatically the la~out of a high-tension overhead line working at a high power e~ergy level in accordance with the me-thod of the invention; and ~igure 2 is a cross-section through the pverhead line of Figure 1.
As shown in Figure 1, an overhead line 1 is secured to supporting structures 2 or 3, which are suitably spaced apart. ~he spacings are as large as possible consistent with the weight to be supported and the permissible sag of the line and also with the nature of the particular terrain involved, ~nd may be spaced by up to several hundred metres. A single suitably insulated suspension device 4 for the line 1 is provided on supporting structures 2 arranged along the line. At points for supplying and -taking o~f the coolant and for cooling it down, supporting structures
3 with two suspension devices 4 fixed to insulators 5 o~ a supporting arm are required for supporting an end section 6 of line through which flows coolant to be withdrawn or for an end section 7 o~ the high-tension overhead line 1 for the supply of cooled coolant.
Provision is made in the neighbourhood of the cross-over po~nt of the end sec-tions 6 and 7 for the uninterrupted tr~nsmission of the high-tension and high power energy, while by-passing the supply or take off points of the coolant, by means for example of a contact bridge 8. ~he coolant is fed via a terminal insulator 9 to a pump 10 ~Ihich feeds it directly or indirec-tly to a heat utilizing device 11 that cools the medium down and renders the heat contained therein a~ailable. A further pump 10 feeds the cooled coolant likewise via an interposed terminal insulator 9 ; through the next successive section of the high-tension line. The heat utilizing device 11 may, if desired, be e~uipped with a heat exchanger 12 traversed by a coolant and connected to a separately thermally -insulated circulating system. This mode of utilizing the abstracted heat is recommended particularly n cases where no heating requir~ment exists in the immediate vicinity of the stations ~or the supply or - 20 withdrawal of coolant. In such cases~ the heat trancifer medium such as water is circulate-l by a special pump 13 in a closed cycle from the heat exchanger 12 to the actual consumer statio~ 14, such as a number of space heating radiatorci of a building, the heating coil system of a hot-house or an industrial or commercial heating consumer~ and whence it is returned in a coo;ed condition to the heat exchanger 12.
, . . .
:.:
, -, - ~ . .. . . .
With reference to Figure 2, the high power energy-- high-tension overhead transmission line 1 comprises a conductor 15, enclosing a thin walled tube 16, which defines a duct 17 for the passage of a coolant, and particularly water. The conductor 15 is preferably designed as a solid conduetor with a substantially smooth surfaee. It may however also consist at least partly of stranded wires or plain wires braided around the solid conductor. These wires are denoted by 20.
~he internal surface of the conductor adjacent the tube, which COIlSiStS for example of alloy steel, ineludes a number of groove-like recesses 18 uniformly distributed around the periphery of the tube, the dimensions of the groove being such that the intervening la~ds 19 collectively ensure adequate heat transfer from the conductor to the tube~ which transfers the electric heat absorbed from the conductor to the coolant flowing through its duct 17.
Various modifications may be made within the scope of the invention.
.
Provision is made in the neighbourhood of the cross-over po~nt of the end sec-tions 6 and 7 for the uninterrupted tr~nsmission of the high-tension and high power energy, while by-passing the supply or take off points of the coolant, by means for example of a contact bridge 8. ~he coolant is fed via a terminal insulator 9 to a pump 10 ~Ihich feeds it directly or indirec-tly to a heat utilizing device 11 that cools the medium down and renders the heat contained therein a~ailable. A further pump 10 feeds the cooled coolant likewise via an interposed terminal insulator 9 ; through the next successive section of the high-tension line. The heat utilizing device 11 may, if desired, be e~uipped with a heat exchanger 12 traversed by a coolant and connected to a separately thermally -insulated circulating system. This mode of utilizing the abstracted heat is recommended particularly n cases where no heating requir~ment exists in the immediate vicinity of the stations ~or the supply or - 20 withdrawal of coolant. In such cases~ the heat trancifer medium such as water is circulate-l by a special pump 13 in a closed cycle from the heat exchanger 12 to the actual consumer statio~ 14, such as a number of space heating radiatorci of a building, the heating coil system of a hot-house or an industrial or commercial heating consumer~ and whence it is returned in a coo;ed condition to the heat exchanger 12.
, . . .
:.:
, -, - ~ . .. . . .
With reference to Figure 2, the high power energy-- high-tension overhead transmission line 1 comprises a conductor 15, enclosing a thin walled tube 16, which defines a duct 17 for the passage of a coolant, and particularly water. The conductor 15 is preferably designed as a solid conduetor with a substantially smooth surfaee. It may however also consist at least partly of stranded wires or plain wires braided around the solid conductor. These wires are denoted by 20.
~he internal surface of the conductor adjacent the tube, which COIlSiStS for example of alloy steel, ineludes a number of groove-like recesses 18 uniformly distributed around the periphery of the tube, the dimensions of the groove being such that the intervening la~ds 19 collectively ensure adequate heat transfer from the conductor to the tube~ which transfers the electric heat absorbed from the conductor to the coolant flowing through its duct 17.
Various modifications may be made within the scope of the invention.
.
Claims (18)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A system for the overhead transmission of electrical power at low frequencies, comprising: an elongated current-carry-ing overhead conductor section including a hollow, heat conductive, inner tubular member defining a cooling channel therein and an outer tubular member coaxial with said inner tubular member and having an inner peripheral surface in contact at least over a part of its circumference with the outer peripheral surface of said inner tubular member, at least said outer tubular member being of an electrically conductive material to carry said current; means supporting said overhead conductor section aboveground and exposing said conductor section to the atmosphere; means for circulating a cooling fluid through said cooling channel to thereby remove from said section the heat which results from low-frequency conduction of electric current through said section; and means for continuous-ly extracting heat from said cooling fluid outside said cooling channel and utilizing it for useful purposes.
2. A system as claimed in claim 1 wherein said means for extracting heat from the-cooling fluid is a heat exchanger, and further means are provided to deliver said extracted heat to a consumer station where it is utilized for useful purposes.
3. A system as claimed in claim 1 comprising an addi-tional section similar to said section, the means for circulating fluid through said additional section communicating with said means for extracting heat from said section thereby to circulate cooled coling fluid from said section to said additional section.
4. A system as claimed in claim 1, wherein the contact between said peripheral surfaces is such as to permit longitudinal shifting of said tubular members with respect to each other to facilitate winding of said section about a drum prior to its use i n the overhead transmission line.
5. A system as claimed in claim 1, wherein said inner tubular member is of an erosion and corrosion resistant material.
6. A system as defined in claim 1, wherein said elec-trically conductive member incorporates a conductor element of substantial cross section.
7. A system as claimed in claim 6, wherein said con-ductor element surrounds said inner tubular member; and wherein said inner tubular member is resistant to mechanical stresses to carry the mechanical load of said section.
8. A system as claimed in claim 7, wherein said con-ductor element has a plurality of recesses at said inner tubular member which are substantially uniformly distributed about the latter and extend substantially longitudinally of said section.
9. A system as claimed in claim 8, wherein said con-ductor element contacts said outer peripheral surface of said inner tubular member intermediate said recesses; and wherein the cumulative area of such contact amounts to at least one third of the area of said outer peripheral surface.
10. A system as claimed in claim 1, wherein said electrically conductive outer tubular member incorporates a plurality of bare wires extending substantially longitudinally of said section.
11. A system as claimed in claim 10, wherein said wires surround said inner tubular member in at least one layer.
12. A system as claimed in claim 10, wherein said wires twist around said inner tubular member.
13. A system as claimed in claim 10, wherein said wires constitute inter-twisted strands twisting around said inner tubu-lar member.
14. A system as claimed in claim 10, wherein said wires are resistant to mechanical stresses to carry the mechanical load of said section.
15. A method of increasing the electric power trans-mitting capacity and the economy of operation of an overhead high tension transmission line carrying electrical power at low frequencies, comprising the steps of forming an elongated over-head current carrying conductor section in the form of a hollow, heat conductive, inner tubular member, defining a cooling channel therein and an outer tubular member coaxial with said inner tubular member and having an inner peripheral surface in contact at least over part of its circumference with the outer peripheral surface of said inner tubular member, at least said outer tubular member being of an electrically conductive material to carry said current, mounting the overhead conductor aboveground and exposing it to the atmosphere; introducing a cooling medium into one end of the channel; passing the cooling medium through the channel to thereby cool the current-carrying overhead conductor while the cooling medium is heated; and withdrawing the heated cooling medium from the other end of the channel and extracting the heat therefrom; and utilizing the extracted heat for useful purposes.
16. A method as claimed in claim 15, wherein said utilizing step includes guiding the heated cooling medium through a heat-consuming device in which said heated cooling medium is re-cooled.
17. A method as claimed in claim 16, as used in an overheated transmission line consisting of a plurality of con-secutive sections, and further comprising the step of passing the cooling medium which has previously passed through one of said sections and which has been re-cooled subsequently thereto, through a consecutive one of said sections.
18. A method as claimed in claim 15, wherein said utilizing step includes guiding the heated cooling medium through a heat-exchanger in which the heated cooling medium is re-cooled and a different heat-transfer medium is heated.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752512764 DE2512764A1 (en) | 1975-03-22 | 1975-03-22 | PROCESS TO INCREASE THE TRANSMISSION CAPACITY AND EFFICIENCY OF A HIGH VOLTAGE LINE AND SUITABLE HIGH VOLTAGE LINE TO PERFORM THIS PROCESS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1048117A true CA1048117A (en) | 1979-02-06 |
Family
ID=5942181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA233,318A Expired CA1048117A (en) | 1975-03-22 | 1975-08-12 | High-tension overhead lines |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA1048117A (en) |
| DE (1) | DE2512764A1 (en) |
| FR (1) | FR2305875A1 (en) |
| GB (1) | GB1499384A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4219742A (en) * | 1978-12-20 | 1980-08-26 | Gould Inc. | Hybrid dual voltage transmission system |
| DE2918600C2 (en) * | 1979-05-09 | 1982-10-28 | R. & G. Schmöle Metallwerke GmbH & Co KG, 5750 Menden | Hollow profile current conductor |
| DE3050587A1 (en) * | 1980-09-25 | 1982-09-23 | V Ishkin | Three-phase overhead electric line with split phases |
| GB2485211B (en) * | 2010-11-05 | 2015-12-02 | Craig Murphy | An apparatus and method for cooling and recovering heat from electrical power cables |
| CN105448384B (en) * | 2015-12-09 | 2023-11-14 | 中国电力科学研究院 | Power transmission line |
| DE102016205118A1 (en) * | 2016-03-29 | 2017-10-05 | Innogy Se | Method for expanding the electrical transmission capacity of an overhead line system |
| US11581109B2 (en) | 2020-11-18 | 2023-02-14 | VEIR, Inc. | Suspended superconducting transmission lines |
| CA3198998A1 (en) | 2020-11-18 | 2022-05-27 | Stephen Paul Ashworth | Conductor systems for suspended or underground transmission lines |
| WO2022108819A1 (en) | 2020-11-18 | 2022-05-27 | VEIR, Inc. | Systems and methods for cooling of superconducting power transmission lines |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB612482A (en) * | 1946-05-25 | 1948-11-12 | Hugo Sonnenfeld | Improvements in and relating to electric power cable |
| GB693010A (en) * | 1950-07-29 | 1953-06-17 | Irene Sonnenfeld | Improvements in or relating to electric power cable |
| CA923550A (en) * | 1966-08-19 | 1973-03-27 | Dimentberg Moses | Apparatus and method for transmission of electrical energy |
| DE2252926B2 (en) * | 1972-10-27 | 1979-10-18 | Kabel- Und Lackdrahtfabriken Gmbh, 6800 Mannheim | Electric cable |
-
1975
- 1975-03-22 DE DE19752512764 patent/DE2512764A1/en active Pending
- 1975-08-12 CA CA233,318A patent/CA1048117A/en not_active Expired
- 1975-08-15 GB GB3403075A patent/GB1499384A/en not_active Expired
- 1975-08-22 FR FR7526068A patent/FR2305875A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2305875B1 (en) | 1979-07-20 |
| DE2512764A1 (en) | 1976-09-23 |
| GB1499384A (en) | 1978-02-01 |
| FR2305875A1 (en) | 1976-10-22 |
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