[go: up one dir, main page]

WO2008085164A1 - Systèmes, procédés et appareils pour l'application de nouveaux conducteurs de ligne de transmission - Google Patents

Systèmes, procédés et appareils pour l'application de nouveaux conducteurs de ligne de transmission Download PDF

Info

Publication number
WO2008085164A1
WO2008085164A1 PCT/US2007/000607 US2007000607W WO2008085164A1 WO 2008085164 A1 WO2008085164 A1 WO 2008085164A1 US 2007000607 W US2007000607 W US 2007000607W WO 2008085164 A1 WO2008085164 A1 WO 2008085164A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrical power
conductor
voltage electrical
power conductor
line
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.)
Ceased
Application number
PCT/US2007/000607
Other languages
English (en)
Inventor
Lionel O. Barthold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US11/621,518 external-priority patent/US7546680B2/en
Application filed by Individual filed Critical Individual
Priority to CA002636708A priority Critical patent/CA2636708A1/fr
Publication of WO2008085164A1 publication Critical patent/WO2008085164A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
    • H02G1/04—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables for mounting or stretching
    • 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
    • H02G7/02—Devices for adjusting or maintaining mechanical tension, e.g. take-up device

Definitions

  • This invention pertains to the installation of electrical cables or conductors onto towers of high voltage electric power lines. More specifically, the invention is directed to the installation of new conductor s by using the existing or old conductor to draw the replacement or new conductor into place. The invention also permits the replacement operation to be carried out while the electric power line remains in service and energized at high voltage. The invention draws on methods and equipment already in use and well defined in the prior art for working on high voltage lines while the lines are energized, referred to in the trade as "live-line maintenance.”
  • the field of prior art deals largely with methods and equipment for putting transmission line conductors into place (stringing) before a line has been commissioned and energized with voltage.
  • the prior art has evolved to the point where it is common to transfer the conductor directly from the conductor supply reel to its overhead position by means of a transportable "tensioner” or brake at the conductor supply end and a transportable “puller” or winch at the conductor pulling end.
  • the tensioner provides sufficient resistance to the pulling force to assure that the conductor does not touch the ground, thus avoiding nicks and scratches that are sources of electrical discharges or corona once the conductor is energized.
  • Tension stringing equipment is supplied by a number of commercial enterprises, e.g., TSE International of Shreveport, Louisiana, fwww.tse- internationaLcomV Procedures are well established and documented, as for example in the reference IEEE Guide to the Installation of Overhead Transmission Line Conductors, Product No: SH95170.
  • FIG. 1 illustrates the context of a conventional prior art conductor stringing operation which, in this case is presumed to proceed from right to left. It presumes that tower 100 and all towers to the right of tower 100 have been strung and attached to the bottom of insulator strings 10 with permanent clamps 13. It presumes that a section of line between towers 101 and 200 is now to be strung and that tower 201 and those to the left of tower 201 will be strung in a subsequent stringing operation. Towers 100 and 101 are adjacent to one another, as are towers 200 and 201. Stringing blocks 14 have been affixed to the bottom of insulator strings 10 on towers 101 through 200, and a lead cable 11 has been threaded through them in preparation for stringing.
  • Stringing blocks 14 have two sheaves per conductor at the terminating towers, 101 and 200, one sheave per conductor on intermediate towers (not shown).
  • the conductor 4 already installed on the line section to the right of tower 100 been temporarily tied to anchor 12 to sustain tension.
  • New conductor 4 is now being fed from the supply reel 61 of tensioner 60, pulled into place onto tower 101 and the line section between tower 101 and 200 by means of lead cable 11 which is being pulled from the tower 200 position, not shown in this figure.
  • the tensioner 60 must maintain sufficient tension to prevent the new conductor 4 from sagging to the ground between adjacent spans of the line section 101 to 200.
  • the new conductor 4 is connected to lead cable 11 by means of prior art coupler 7.
  • FIG. 3 shows the pulling end of the prior art operation illustrated in FIG.
  • Puller 70 consists of an engine (not shown) that drives one or more bull wheels 72 and 73 around which lead cable 11 makes multiple turns so as to gain the friction needed for the pulling function. Lead cable 11 is coiled around take-up reel 71 for reuse on the next pulling section.
  • Bull wheels 62 and 63, and supply reel 61, of tensioner 60 shown in FIG. 1 are typically mounted on special vehicles, which are prior art with respect to conductor installation practice. For purposes of this illustration they are shown in FIG. 2 simply as platforms 65 and 66. Similarly, bull wheels 72 and 73, and take- up reel 71, of puller 70 in FIG. 3 are also typically mounted on prior art special vehicles but are shown in the figure as simply platforms 75 and 76. Platforms 75 and 76 may be mounted on one and the same vehicle.
  • the invention comprises systems, methods, and equipment to allow an old or existing transmission line conductor to serve as the lead cable to draw a new or replacement conductor into place in its stead while, in one embodiment, both conductors and the line itself continue to carry foil current under full voltage.
  • the supply reel of new conductor and associated tensioner are insulated from ground and maintained at line potential, as is the take-up reel and associated puller.
  • the invention differs from prior art in that it describes equipment modifications, auxiliary equipment, and methods by which the old conductor can be cut, tied to the new conductor, and used as a lead cable to pull the new conductor into place.
  • the invention may achieve the replacement while providing a continuous path for current to flow over the line section being replaced, thus causing no interruption of power flow, hi another embodiment, the invention may achieve the replacement by restricting the power interruption to a very short duration.
  • the transfer of current from one conductor to another, at both the tensioning and pulling ends of the operation is achieved by causing the conductor to make one or more turns around a conducting wheel from which it receives current.
  • the wheel which rotates as the conductor is pulled, receives its current from a system of brushes tied, in turn, to the fixed conductor at either end of the re-conductoring section.
  • FIG. 1 illustrates a series of transmission line towers, some of which are to be strung or restrung;
  • FIG. 2 illustrates the tensioning end of a prior art tension stringing operation
  • FIG. 3 illustrates the pulling end of the prior art tension stringing operation shown in FIG. 2;
  • FIG. 4 illustrates an overview of the preferred embodiment of the invention;
  • FIG. 5 illustrates Step 1 of the preparation at the pulling end for a live-line tension stringing operation, according to the preferred embodiment of the invention
  • FIG. 6 illustrates Step 2 of the preparation at the pulling end for a live-line tension stringing operation, according to the preferred embodiment of the invention
  • FIG. 7 illustrates Step 3 of the preparation at the pulling end for a live-line tension stringing operation, according to the preferred embodiment of the invention
  • FIG. 8 illustrates an insulated puller in place, according to the preferred embodiment of the invention
  • FIG. 9 illustrates the current flow through the insulated puller shown in FIG. 8;
  • FIG. 10 illustrates an insulated puller near completion of the pull, according to the preferred embodiment of the invention
  • FIG. 11 illustrates Step 1 of a live-line puller disengagement, according to the preferred embodiment of the invention
  • FIG. 12 illustrates Step 2 of a live-line puller disengagement, according to the preferred embodiment of the invention.
  • FIG. 13 illustrates Step 3 of a live-line puller disengagement, according to the preferred embodiment of the invention.
  • FIG. 14 illustrates Step 4 of a live-line puller disengagement, according to the preferred embodiment of the invention.
  • FIG. 15 illustrates the completion of a live- line puller disengagement, according to the preferred embodiment of the invention
  • FIG. 16 illustrates Step 1 of the preparation at the tensioning (supply) end for a live-line tension stringing operation, according to the preferred embodiment of the invention
  • FIG. 17 illustrates Step 2 of the preparation at the tensioning (supply) end for a live-line tension stringing operation, according to the preferred embodiment of the invention
  • FIG. 18 Illustrates Step 3 of the preparation at the tensioning (supply) end for a live-line tension stringing operation, according to the preferred embodiment of the invention
  • FIG. 19 illustrates an insulated tensioner in place, commencing the live- line pull, according to the preferred embodiment of the invention
  • FIG. 20 illustrates the current flow through the insulated tensioner shown in FIG. 19;
  • FIG. 21 illustrates a portion of bull wheels dedicated to current transfer;
  • FIG. 22 illustrates the auxiliary reactor connection for over-current protection
  • FIG. 23 illustrates the bypass contactor and protective gap for over-current protection
  • FIG. 24 illustrates an electrical equivalent of over-current protection scheme
  • FIG. 25 illustrates an alternative embodiment of the invention with a dedicated contactor wheel and pressure wheels
  • FIG. 26 illustrates an alternative embodiment of the invention with a dedicated contactor wheel and wheel-mounted clamps
  • FIG. 27 illustrates an example mid-span current transfer device embodiment of the invention
  • FIG. 28 illustrates a schematic of a current transfer wheel and brush assembly
  • FIG. 29 illustrates Step 1 in use of the mid-span current transfer device
  • FIG. 30 illustrates the midspan current transfer device used in conjunction with a puller
  • FIG. 31 illustrates the midspan current transfer device used in conjunction with a tensioner
  • FIG. 32 illustrates an example embodiment of the device on one or more truck beds
  • FIG. 33 illustrates an example of the insulated ramp to allow use of conventional tensioners and pullers adapted to use the invention
  • FIG. 34 illustrates an example of the collapsible platform to support the tensioning and pulling equipment
  • FIG. 35 illustrates an example of an access bucket to the energized platform
  • FIG. 36 illustrates a schematic of a means to achieve hot-line stringing on poles or towers of vertical configuration
  • FIG. 37 illustrates an embodiment of the invention achieving limited interruption time restringing using prior art pullers and tensioners; and FIG. 38 illustrates a system for detecting a stuck sheave.
  • FIG. 4 provides a simplified schematic diagram of the preferred embodiment of the invention, a system in which an old or existing high- voltage conductor is used to pull a new or replacement high-voltage conductor into place in its stead.
  • FIG. 4 shows both the first tower 101 and the last tower 200 of the line section over which the previous conductor is to be replaced.
  • Double sheave stringing blocks 14, have been attached to towers 101 and 200. Similar blocks with one sheave per conductor have been installed on intermediate towers.
  • FIG. 4 also shows a tensioner or similar device 60 that is used to supply the new conductor 4, and a puller or similar device 70 that is used to take up the old conductor 8. New conductor 4 is attached to the old conductor 8 by the use of a coupler or similar device 7. Puller 70 is used to pull old conductor, 8 which in turn pulls new conductor 4 into place through stringing blocks 14. The high- voltage line may remain energized during the replacement operation and current may continue to be carried as illustrated by the "Current In" and "Current Out” arrows.
  • FIG. 5 an auxiliary insulator 15, temporary guy 16, and temporary anchor 12 have been attached to the old conductor 8 by means of a coupler 7 and made to draw up tension using a prior art winch or come-along (not shown), pulling conductor 8 to the right and down through stringing block 14.
  • FIG. 6 a lead cable 11 has been threaded through a second sheave on stringing block 14 and attached to the old conductor 8 somewhat to the right of the point at which the anchor assembly 15, 16, 12 are attached.
  • the lead cable 11 in this case is capable of carrying full line current.
  • the lead cable 11 in FIG. 6 has been pulled to take up slack.
  • FIG. 7 the section of old conductor indicated as A in FIG. 6 has been cut out of place, leaving the lead cable 11 carrying the full tension of the conductor to the right of tower 200.
  • the anchor assembly 15, 16, 12 in turn is carrying the full tension of the conductor to the left of tower 200.
  • FIG. 8 shows a schematic of the puller 70 which supplied the lead cable 11 in FIG. 6 and FIG. 7. Note that prior to the operations cited in those figures, a jumper lead 20 has been connected from the bull wheel 73 to the old conductor 8 by means of a coupler 7 immediately to the left of tower 200, thus providing a path for current from the old conductor 8 to the right of tower 200, through the lead cable 11, through a portion of the bull wheel 73 and to the old conductor 8 on the line section to the left of tower 200, not yet a part of the restringing operation.
  • FIG. 9 shows that current path.
  • FIG. 10 shows the same configuration as in FIG. 8 and FIG. 9, but near the end of the pulling operation.
  • the new conductor 4 has been pulled through stringing blocks 14 over the entire length of the pulling section from tower 101 to tower 200.
  • the new conductor 4 must now be connected to the old conductor 8 to the left of tower 200 in order that the pulling equipment can be removed.
  • FIGS. 11 - 15 illustrate an example means by which the old and new sections of conductor can be connected pending set up for a new pulling section.
  • FIG. 11 shows a detail of the line connections of FIG. 10 but with two points, X and Y identified; points to which a tensioning device will be attached.
  • FIG. 12 presumes that a live-line tensioning device (prior art and not shown) has drawn points X and Y closer together, thus creating slack in that segment of old conductor 8 and the new conductor 4 which pass through double- sheave stringing block 14.
  • FIG. 13 shows that the slack segment of the old conductor 8, which was formerly tied to the auxiliary insulator 15, has been permanently clamped to new conductor 4 to the right of tower 200 by coupler 7, thus providing a direct path for current and allowing removal of the brush feed cable 20.
  • FIG. 14 shows the same condition but with the tensioning device relaxed and removed, leaving the left hand portion of the new conductor 4 slack and, in FIG. 15, removed. This leaves the section of line to the left of tower 200 ready for restringing in the same manner.
  • FIG. 16 shows the initial preparation corresponding to that of FIG. 5 for the pulling end. It presumes that new conductor 4 has already been installed on towers 100 and all those to the right of tower 100. Once again the temporary guy assembly 15, 16, 12 is made to pull the conductor 4 to the left and downward through the stringing block 14 by means of a prior art winch or come- along. In FIG. 17 the end of a new reel of new conductor 4 has been fed from right to left through the stringing block 14 and attached to the old conductor 8 by means of a coupler 7 to the left of the point of attachment of the temporary guy assembly 15, 16, 17.
  • FIG. 18 the section of old conductor 8 designated as A in FIG. 17 has been cut away leaving the section of new conductor 4 to the left of tower 101, the section already restrung, supported in tension solely by the temporary guy assembly 15, 16, 12, and the section to the left of tower 101, the section to be restrung, supported in tension solely by the tensioner 60 a more detailed illustration of which is given in FIG. 19.
  • the puller described in previous paragraphs, pulls the old conductor through stringing blocks over the line section, defined here by towers 101 to 200, a reel of new conductor 61, being attached to the old conductor 8 by coupler 7, is fed onto that line section.
  • the tensioner maintains sufficient tension during the pulling operation to prevent the conductor from sagging to unsafe levels while the restringing is taking place.
  • FIG. 20 illustrates the path of current during the operation cited above.
  • FIGS. 19 and 20 show that, in one embodiment of this invention the supply reel 61, and bull wheels 62 and 63, of tensioner 60, and all associated motors, brakes, and auxiliary equipment, may be at full line voltage. They are shown mounted here on insulated platforms 65 and 66, which are described later. Attached to platforms 65 and 66, which may be combined as one, is rapid grounding switch 18 that in turn is connected to ground via ground connector 19. Rapid grounding switch 18 may be operated by a line tension sensor (not shown) so as to immediately short-circuit the conductor and cause the line be tripped out of service by circuit breakers (not shown) at either end in the event that the tension drop indicates loss of control of conductor clearance to ground. These breakers will operate in less than one half second, before a broken conductor would hit the ground, thus protecting both the stringing crew and the general public from high voltage contact.
  • a line tension sensor not shown
  • circuit breakers not shown
  • FIGS. 8, 9 and 10 shows that the take-up reel 71, and bull wheels 72 and 73, of puller 70, and all associated motors, brakes and auxiliary equipment, may also be at full line voltage. They are shown here mounted on insulated platforms 75 and 76, which are described later. As with the tensioner discussed above, a rapid grounding switch 18 is attached to platforms 75 and 76, which may be combined as one, to ground by ground connector 19. For the sake of personnel safety both the tensioning and pulling platforms 60 and 70 and all associated equipment may be surrounded by a metallic fence mounted on a high- conductivity ground mat, well connected to ground. Other safety issues are described in later paragraphs. Current Transfer Methods
  • FIG. 21 shows an embodiment of the invention in the form of specially designed bull wheels of the general form used in the tensioner 60 shown in FIGS 19 (bull wheels 62 and 63) and in the puller 70 shown in FIG. 8 (bull wheels 72 and 73). While only bull wheels 62 and 63 are shown in FIG. 21, the following discussion is similarly applicable to bull wheels 72 and 73.
  • the friction section of bull wheels 62 and 63 (labeled 62a and 63a), is dedicated to maintaining friction for tensioning.
  • the conducting section of bull wheels 62 and 63 (labeled 62b and 63b), is dedicated to gaining good electrical contact between new conductor 4 and bull wheels 62 and 63.
  • Grooves in the friction section may typically be lined with plastic material to improve friction and prevent mechanical wear of the wheels.
  • Grooves in the conducting section may typically be lined with a conducting liner.
  • the conducting section 62b and 63b of bull wheels 62 and 63 may be made with a slightly larger diameter to provide a degree of "wiping" action to enhance contact.
  • the liner in the conducting sections may typically see considerable wear and should be designed for convenient periodic replacement.
  • FIG. 21 further illustrates a brush system.
  • there are two rotating brush plates 38 one coupled to each of the upper and lower bull wheels 62 and 63.
  • Rotating brush plates 38 mechanically and electrically connect to conducting section 62b and 63b of bull wheels 62 and 63.
  • a number of brushes 39 are pressed against rotating brush plate 38 by springs (not shown) and serve to transfer current from fixed brush holder assembly 40 which, in turn, is connected by jumper leads 20 to the source of current supplied to the conductor.
  • the number, size, and properties of brushes 39 should be selected to assure acceptable current density at the point of brush contact with the rotating brush plate 38. All components of the brush system described in this paragraph are in common application.
  • the number of grooves devoted to electrical contact and the diameter of the bull wheels themselves must be selected to assure acceptable current density at the conductor surface.
  • FIG. 22 an auxiliary reactor 48 is shown in series with the jumper lead 20, the remote end of which is identified as point R.
  • FIGS. 23 A and 23B show a short circuit current bypass system consisting of a high conductivity flat bypass contact disc 49, mechanically and electrically bonded to the outside edge of the conducting portion of bull wheels, 62a and 62b in FIG. 21.
  • FIG. 24 shows an electrical equivalence diagram where the combined voltage drop across the brushes 39 and auxiliary reactor 48 causes the gap or surge arrester 51 to flash over, thus diverting short circuit current from the brush assembly.
  • FIG.25 Another example embodiment of the invention is shown in FIG.25 where an assembly consisting, in part, of a single contactor wheel 21, separate and distinct from a bull wheel assembly, is used for transferring electrical current from or to a conductor.
  • the assembly shown in FIG.25 would be installed between the point of departure of a conductor from a standard puller and tensioner and the point of entry or departure of the conductor to its overhead position allowing standard bull wheel configurations to be used for either pulling or tensioning.
  • the conductor 4 is caused to pass over a major portion of the contactor wheel 21 by directioning idler wheels 21 A.
  • the contactor wheel 21 groove may be equipped with a high conductivity metallic , liner.
  • the conductor 4 is forced into a tight metallic contact with the contactor wheel 21 by pressure wheels 21 B, thus establishing good contact independent of the tension on the conductor itself.
  • Arrows indicate the direction of pressure.
  • the pressure wheels 21 B are fixed to the same framework as the contactor wheel 21 and held against it by appropriate spring mechanisms (not shown).
  • FIGS. 26A and 26B show still another possible embodiment in which a series of clamps 52 are mounted on the contactor wheel 21, mechanically and electrically clamping the conductor 4 to the contactor wheel 21 but releasing prior to the entry or departure point of the conductor from the contactor wheel 21.
  • FIG. 26B shows one possible clamp device 52 where pressure on operating arm 55 forces the upper clamp face 54, free to pivot about its mounting frame 53 which is directly attached to the contactor wheel 21, against the conductor 4 or, when subject to tension, lifts the clamp face 54 off the conductor 4 and out of the way.
  • the operating arm 55 may be caused to push or pull the clamp face 54 by any number of mechanical linkages that sense the position of rotation of the contactor wheel 21.
  • 27A, 27B and 27C uses the conductor tension as a means of assuring good contact between the conductor and a contactor wheel 21 completely separate from standard pulling and tensioning equipment and, in this example, mounted on a separate platform useable both pulling and later tensioning functions without the need for relocation of equipment for the two purposes. It may also serve from that location each phase position of a three-phase transmission line.
  • This embodiment shows a separate contactor wheel 21 rotating about an axle that is mounted on a frame 22, that frame 22 resting on a working platform 25 that, in turn, is mounted on a second frame 23 by means of suitable insulators.
  • the contactor wheel 21 is neither driven nor braked and serves only to transfer current from a clamp 24, the function of which is explained later, through a jumper lead 20, to a brush assembly 17 to the contactor wheel 21 and by way of that wheel 21 to whatever conductor is wrapped around it.
  • FIGS. 28A and 28B show the contactor wheel 21 assembly of FIGS. 27 A, 27B, and 27C in somewhat more detail and with the same current transfer scheme cited previously.
  • the contactor wheel 21 with a soft metal surface or liner should have a sufficient length of conductor-to-wheel contact area to transfer current between the two members without generating excess heat.
  • a conductive brush contact plate 38 mounted on and rotating with the contacting wheel 21 and well connected to the surface against which the conductor turns 4 are pressed.
  • a series of brushes 39 are caused to press against the brush contact plate 38 by conventional brush support assemblies, the brushes 39 being supported by and electrically fed by a stationary assembly 40 which, in turn, is connected to either the incoming or outgoing line conductor as shown in previous figures.
  • FIG. 29 shows the transfer device of FIGS. 28A, 28B, and.28C located in mid-span with the old conductor 8 drawn down to the clamp 24 preparatory to the stringing operation.
  • FIG. 30 shows a conducting lead cable 11 attached to the old conductor 8, fed around the contact wheel 21, and to the puller. Pulling up slack on the old conductor 8 to sever it and achieve the configuration shown in FIG. 30 can be achieved by methods outlined previously. It should be noted that longitudinal tension on the transfer device will be approximately balanced throughout this transfer.
  • the puller which may now be comprised of standard equipment and prior art, need only be adapted for operation at line potential as discussed later.
  • FIG. 31 shows the use of the same transfer device, at the same location, in conjunction with a tensioning device for the pulling section immediately to the left of the one completed while the device was used in conjunction with pulling equipment.
  • FIGS. 32A and 32B show a means way by which a tensioner or a puller might be mounted on a dedicated vehicle 26. Height could be reduced by recessing the bottom of the insulators into wells inherent in the truck bed design.
  • the engines or brake assemblies could be incorporated onto the insulated platform or placed on an un-insulated trailer 28 and 29, mechanically coupled to the tensioner or puller by means of an insulated shaft 27.
  • FIG. 33 shows one simple manner in which tensioning or pulling equipment can be applied, i.e., by erecting a transportable platform 30 and supporting it by means of a system of insulators 32, gaining truck access by a ramp 31 that is removed once the equipment is in place.
  • FIGS. 34A and 34B show a collapsible platform 30 with a ground platform 34 in which the support insulators 32 are attached to pivoted support assemblies 33 which allow the platform to go from its collapsed state, as shown in FIG. 34A, to its erected state, as shown in FIG. 34B,for use.
  • FIGS. 35A and 35B show an insulated arm 35, on the end of which is a personnel bucket 37.
  • the insulated arm 35 is attached to swiveling platform extension 36.
  • the arm 35 is capable of being rotated outward and downward to allow safe entrance to or egress from the high voltage platform.
  • Power lines of vertical configuration The figures previously shown presume a transmission line in which the conductors are presumed to side-by-side in a horizontal configuration. There is no reason the invention cannot be used on transmission towers on which two transmission circuits are arrayed vertically as illustrated in FIG. 36, which shows a double circuit tower 41. In this case it will be necessary to both feed and pull the new conductor from a point to the side of rather than below the conductor being replaced.
  • the laterally oriented tensioning and pulling may, as illustrated in FIG. 36, require use of an auxiliary block 44 suspended either from an insulated auxiliary support structure or "gin pole" 43, or from a vehicle-mounted insulated structure (not shown).
  • the fed or pulled new conductor 4 would then pass from the above- described tensioner or puller 45 through the auxiliary block 44 to the previously described stringing block 9 longitudinally onto the line.
  • the line may be de-energized, the insulator assembly 15 mechanically bypassed and removed, and conventional prior art pulling operation undertaken.
  • elevated platforms and their immediate surrounding work area may be enclosed by a high, well grounded fence
  • the access gate 46, and the access gate may be interlocked to prevent ingress or egress while pulling is in progress.
  • a well grounded ground mat 47 may extend over the entire area enclosed within the fence cited above to prevent danger from step potential in the event of a short circuit.
  • a means of safely entering and leaving the insulated platform while the major equipment is at line potential may be provided.
  • Low tension, high tension, and rapid tension change sensors capable of actuating high speed grounding switches at both tensioning and pulling ends of the section being strung may be provided.
  • FIG. 38 A illustrates a special jam-sensing system consisting of a stringing block 56 preparing to rotate and to transport the new conductor 4 into position.
  • FIG. 38B shows that once the pull has begun, some change in the suspension angle, ⁇ , of the insulator/block assembly will result from the pull. Reasonable and safe limits to ⁇ can be predicted.
  • FIG. 3SB the sheave of the stringing block 56 is rotating normally and the conductor 4 is moving. Should the sheave jam either due to a fracture, sticking, or a stuck coupler, rotation of the sheave will stop, thus causing the suspension angle to increase to ⁇ as shown in FIG. 38C.
  • This dangerous condition can be detected either by (a) increase of the suspension angle by some pre-calculated amount or (b) increase in the suspension angle of any amount and a failure of the jam-sensing sheave 56 to rotate. Both suspension angle and sheave rotation can be measured by a variety of existing prior art sensor systems.
  • the jam-sensing sheave system 56 can easily include measurement of sheave bearing temperature. A high temperature and/or a high rate of rise of temperature may give an early warning that a jam may be pending. The system may also be made to read conductor speed relative to the stringing block, adding to the logic of jam detection. AU of the above sensing systems, taken individually, constitute prior art. Their collective use to detect and transmit a sheave jam or impending jam constitutes a part of this invention.

Landscapes

  • Electric Cable Installation (AREA)

Abstract

La présente invention concerne un procédé et équipement associé pour remplacer des conducteurs de ligne de transmission aérienne existants avec des nouveaux tandis que la ligne de transmission reste en service et transporte de l'électricité. L'invention utilise le vieux conducteur pour tracter le nouveau conducteur à travers une série de poulies installées au pied de chaque isolateur de pylône. Des principes de déroulage sous tension mécanique sont utilisés pour garantir que tant le vieux que le nouveau conducteur maintiennent une distance de sécurité à partir du sol. Pour réaliser ceci, tant l'équipement de traction et de tensionnement (freinage) que des bobines ou tambours émetteurs et récepteurs peuvent être amenés à la tension d'alimentation de ligne et le courant est transféré entre le nouveau conducteur et le vieux, tandis qu'il transite vers la ligne, au moyen d'un système de balai et d'une roue conductrice qui peuvent être intégrés ou non à l'équipement de traction et tensionnement.
PCT/US2007/000607 2007-01-09 2007-01-10 Systèmes, procédés et appareils pour l'application de nouveaux conducteurs de ligne de transmission Ceased WO2008085164A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002636708A CA2636708A1 (fr) 2007-01-09 2007-01-10 Systemes, procedes et appareils pour l'application de nouveaux conducteurs de ligne de transmission

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/621,518 2007-01-09
US11/621,518 US7546680B2 (en) 2006-01-10 2007-01-09 Systems, methods and apparatus for transmission line re-conductoring

Publications (1)

Publication Number Publication Date
WO2008085164A1 true WO2008085164A1 (fr) 2008-07-17

Family

ID=39608920

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/000607 Ceased WO2008085164A1 (fr) 2007-01-09 2007-01-10 Systèmes, procédés et appareils pour l'application de nouveaux conducteurs de ligne de transmission

Country Status (2)

Country Link
CA (1) CA2636708A1 (fr)
WO (1) WO2008085164A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104617536A (zh) * 2015-03-02 2015-05-13 朱金凤 电力线轮盘减振子
WO2016203219A1 (fr) * 2015-06-16 2016-12-22 Babcock Networks Limited Procédé de déroulage de conducteur aérien
CN109489881A (zh) * 2018-08-16 2019-03-19 金华八达集团有限公司科技信息分公司 一种电力线路覆冰张力不平衡检测系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5297654A (en) * 1991-04-29 1994-03-29 Electricite De France Service National Helicopter-carried nacelle and its use process for the replacement of an overhead cable portion
GB2313592A (en) * 1996-05-29 1997-12-03 Schaeff Karl Gmbh & Co Flanged cable drum
WO2003005516A1 (fr) * 2001-06-11 2003-01-16 Daewon Electric Company Limited. Dispositif de changement de cable a l'interieur d'un poteau electrique et procede de distribution d'energie sans coupure de courant
WO2004079877A1 (fr) * 2003-03-04 2004-09-16 Eve Group Limited Appareil et procede de remplacement d'un conducteur suspendu
US20050133244A1 (en) * 2003-08-29 2005-06-23 Devine Clifford W. Live conductor stringing and splicing method and apparatus
EP1551086A1 (fr) * 2003-12-23 2005-07-06 Reels BVBA Tambour à câble

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5297654A (en) * 1991-04-29 1994-03-29 Electricite De France Service National Helicopter-carried nacelle and its use process for the replacement of an overhead cable portion
GB2313592A (en) * 1996-05-29 1997-12-03 Schaeff Karl Gmbh & Co Flanged cable drum
WO2003005516A1 (fr) * 2001-06-11 2003-01-16 Daewon Electric Company Limited. Dispositif de changement de cable a l'interieur d'un poteau electrique et procede de distribution d'energie sans coupure de courant
WO2004079877A1 (fr) * 2003-03-04 2004-09-16 Eve Group Limited Appareil et procede de remplacement d'un conducteur suspendu
US20050133244A1 (en) * 2003-08-29 2005-06-23 Devine Clifford W. Live conductor stringing and splicing method and apparatus
EP1551086A1 (fr) * 2003-12-23 2005-07-06 Reels BVBA Tambour à câble

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BRAGA A.E.: "Conductor Cable Replacement on an Energized Transmission Line", TRANSMISSION AND DISTRIBUTION CONSTRUCTION OPERATION AND LIVE-LINE MAINTENANCE PROCEEDINGS 2000 IEEE ESMO - 2000 IEEE 9TH INTERNATIONAL CONFERENCE. MONTREAL, QUE, 8 October 2000 (2000-10-08) - 12 October 2000 (2000-10-12), pages 392 - 396 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104617536A (zh) * 2015-03-02 2015-05-13 朱金凤 电力线轮盘减振子
WO2016203219A1 (fr) * 2015-06-16 2016-12-22 Babcock Networks Limited Procédé de déroulage de conducteur aérien
CN109489881A (zh) * 2018-08-16 2019-03-19 金华八达集团有限公司科技信息分公司 一种电力线路覆冰张力不平衡检测系统
CN109489881B (zh) * 2018-08-16 2020-09-01 金华八达集团有限公司科技信息分公司 一种电力线路覆冰张力不平衡检测系统

Also Published As

Publication number Publication date
CA2636708A1 (fr) 2008-07-17

Similar Documents

Publication Publication Date Title
US7546680B2 (en) Systems, methods and apparatus for transmission line re-conductoring
US8505878B2 (en) Apparatus and method for enhancing the reconductoring of overhead electric power lines
EP2849296B1 (fr) Procédé et appareil d'épissurage et de déroulage de conducteur en direct
WO2008085164A1 (fr) Systèmes, procédés et appareils pour l'application de nouveaux conducteurs de ligne de transmission
US8508081B2 (en) Live conductor stringing and splicing method and apparatus
RU125730U1 (ru) Устройство намотки изоляционной клейкой ленты для предотвращения обрыва проводов и грозозащитных тросов воздушных высоковольтных линий электропередач
EP1727251A2 (fr) Procédé et dispositif de déroulage et d'épissage d'un conducteur sous tension
NL2004858C2 (nl) Werkwijze voor het aanbrengen of vervangen van een draagkabel van een bovenleidingsysteem voor een elektrisch aangedreven voertuig.
Mitra CHAPTER–6 STRINGING OF CONDUCTORS AND EARTH WIRE
HK1099134A (en) Live conductor stringing and splicing method and apparatus
HK1099135A (en) Live conductor stringing and splicing method and apparatus
HK1098586A (en) Live conductor stringing and splicing method and apparatus
HK1103859A (en) An equipotential zone for work on energised conductors
HK1099133A (en) Live conductor stringing and splicing method and apparatus
HK1099132A (en) Live conductor stringing and splicing method and apparatus
HK1099608A (en) Live conductor stringing and splicing method and apparatus
HK1105017A (en) A traveller for use in live conductor stringing and splicing

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 2636708

Country of ref document: CA

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07716475

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 07716475

Country of ref document: EP

Kind code of ref document: A1