WO2022149013A1 - Cable replacement safety system and method - Google Patents

Cable replacement safety system and method Download PDF

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Publication number
WO2022149013A1
WO2022149013A1 PCT/IB2021/061172 IB2021061172W WO2022149013A1 WO 2022149013 A1 WO2022149013 A1 WO 2022149013A1 IB 2021061172 W IB2021061172 W IB 2021061172W WO 2022149013 A1 WO2022149013 A1 WO 2022149013A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable
net
replaced
tower
replacement system
Prior art date
Application number
PCT/IB2021/061172
Other languages
French (fr)
Inventor
Dirk Cornelus TALJAARD
Original Assignee
Fibre Optic Replacement Systems (Pty) Limited
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
Application filed by Fibre Optic Replacement Systems (Pty) Limited filed Critical Fibre Optic Replacement Systems (Pty) Limited
Publication of WO2022149013A1 publication Critical patent/WO2022149013A1/en

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
    • H02G7/18—Devices affording mechanical protection in the event of breakage of a line or cable, e.g. net for catching broken lines

Definitions

  • This invention relates to a cable replacement safety system and method and more particularly, but not exclusively, to a cable replacement safety system and replacement method for use in safely replacing overhead cables such as an overhead transmission ground cable, optical fibre overhead ground wire (OPGW), conductor stringing and/or crossing lines.
  • overhead cables such as an overhead transmission ground cable, optical fibre overhead ground wire (OPGW), conductor stringing and/or crossing lines.
  • OPGW optical fibre overhead ground wire
  • overland electricity transmission lines may require the replacement of such lines (also referred to as cables).
  • lines also referred to as cables.
  • the rest of the transmission structure including lower cables, the towers, support cables and the like, are at risk.
  • the replacement cable may fall onto such lower items and cause damage. The damage is exacerbated when the transmission line is live.
  • the live cables are switched off when a cable is being replaced to guard against accidental interference and/or to protect human maintenance personnel.
  • the earth or ground cable is the uppermost cable spanned between pylons or towers.
  • Power transmission lines cannot be readily switched off at will, especially where they supply clients such as factories and the like. Cooperation with clients might be required. Such cooperation and advance planning increases the cost and time of maintenance.
  • a cable replacement safety method comprising the steps of:
  • the method further includes any one or more of the steps of:
  • the catching means to be an elongate net structure
  • the support bracket includes a roller and that it is connected with working earths lines to parts of the tower; - putting a front end of the net together with a front end of the recovery line up the tower, over the support bracket and attaching it to the tug;
  • the method further includes the step of cutting the cable to be replaced and attaching a front end of the new cable to a rear end of the cable to be replaced and pulling the cable to be replaced through the rib cage brackets thereby pulling the new cable into position.
  • the method further includes the step of the cable being any type of overhead cable such as an overhead transmission ground cable, high-tension cable, optical fibre overhead ground wire (OPGW), conductor stringing or crossing lines.
  • OPGW optical fibre overhead ground wire
  • This invention extends to a cable replacement system comprising: an elongate catching means attached to a number of securing means with the securing means attached to a cable to be replaced.
  • the elongate catching means is a net.
  • a further feature of the invention provides for the securing means to depend from the cable to be replaced so that the net is supported by the securing means underneath the cable to be replaced.
  • the securing means prefferably be a ring-shaped bracket or rib cage bracket having hook formations.
  • the hook formations are at an outer circumference of the rib cage bracket.
  • the rib cage bracket has an upper roller that engages on top of the line to be replaced.
  • Parts of the net are attached to the hook formations so that the net forms a concave receptacle when attached to two spaced apart rib cage brackets.
  • a still further feature of the invention provides for a recovery line to run together with the net with its front end attached to a foremost rib cage bracket or to a net puller pulley or to a front end of the net.
  • recovery line is supported on a recovery line lower roller of the rib cage bracket.
  • a still further feature of the invention provides for the cable to be any type of overhead cables such as an overhead transmission ground cable, optical fibre overhead ground wire (OPGW) conductor stringing and/or crossing lines.
  • OPGW optical fibre overhead ground wire
  • Figure 1 shows a perspective view schematic diagram of a power transmission line
  • Figure 2 shows a close-up view of a tower of the power transmission line of figure 1 , in perspective view
  • Figures 3 to 12 show a sequence of a method in accordance with the invention.
  • the transmission line 1 includes a number of towers 2a, 2b and 2c. Uppermost cables 3 are earth cables and live transmission cables 4 are supported underneath the earth cable 3. All these cables are spanned between the towers as is known in the art. Once installed, working earth lines 5 are connected between the earth cable 3 and the towers. Pulleys 6 are attached along the height of a tower with an uppermost pulley attached to an earth peak. The pulleys 6 may also be connected to the tower with working earth cables.
  • the cable replacement system includes an elongate catching means 8 attached to several securing means 10 with the securing means attached to a cable to be replaced
  • the elongate catching means is a net 8 and is attached to the securing means 10 which is a ring-shaped bracket or rib cage bracket having at least two hooks 11 on its operatively left and right and operatively upper circumference.
  • the rib cage brackets 10 include centrally located sets of pulleys with an uppermost pulley 12 located on a cable to be replaced 14.
  • a lowermost pulley 13 supports a recovery line 9 as is further described below.
  • the rib cage bracket 10 is hinged or might otherwise be broken so that it opens for installation over the line to be replaced and for inserting the recovery line.
  • a securing lever 18 may be opened and closed to selectively engage the rib cage bracket 10 with the line to be replaced 14 and/or the recovery line 9.
  • the recovery line 9 runs together with the net 8, inside thereof and attaches to a net puller pulley 17.
  • the net puller pulley 17 and/or a front end of the net 8 and/or the recovery line 9 are attached to a tug 7 for initial installation as described further below.
  • a worker ascends a first tower 2a and may attach pulleys 6 along the height of the tower. The worker will at least attach an uppermost pulley 6 at an earth peak of the tower. The worker conducts an HV test on the earth wire and installs the working earth wires.
  • the tug 7 is then used to pull the net 8 and the recovery line 9 towards the second tower 2b.
  • Rib cage brackets 10 are attached to the cable to be replaced and to the net at regular intervals as the net and recovery line are being pulled towards the second tower so as to shape the net to form an elongate concave receptacle.
  • the cable to be replaced can be cut in close proximity to tower 2a and a front end of a replacing table can be attached to a rear end (the cut off end) of the cable to be replaced.
  • the further end of the cable to be replaced can also be cut and can then be pulled so that the replacing cable is pulled through successive rib cage brackets 10 until it reaches the further end where the cable to be replaced was cut.
  • the front and rear ends of the replacing cable can now be attached to the parts of the existing cable.
  • the recovery line can now be used to retrieve the net 8 and the rib cage brackets 10.
  • the replacement of the cable was thus done without any risk of the replacing cable or the cable to be replaced interfering with the rest of the transmission structure, such as by falling onto the live cables or any of the towers or any other part of the transmission system. If a problem occurred, the net 8 would have caught a falling cable thus preventing any damage.
  • the invention is not limited to replacing of earth cables and any type of cable, line, wire, optical fibre overhead ground wire (OPGW), high-tension cable, conductor stringing and/or crossing lines can be replaced by the system and method.
  • OPGW optical fibre overhead ground wire

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Abstract

This invention relates to a cable replacement safety system and method and more particularly, but not exclusively, to a cable replacement safety system and replacement method for use in safely replacing and overhead cables such as an overhead transmission ground cable or optical fibre overhead ground wire. The method including the steps of: supporting an elongate catching means in the form of a net (8) between at least two cable support structures underneath a cable to be replaced and replacing the cable with a replacement cable whilst lower cables transmit electricity.

Description

CABLE REPLACEMENT SAFETY SYSTEM AND METHOD
FIELD OF THE INVENTION This invention relates to a cable replacement safety system and method and more particularly, but not exclusively, to a cable replacement safety system and replacement method for use in safely replacing overhead cables such as an overhead transmission ground cable, optical fibre overhead ground wire (OPGW), conductor stringing and/or crossing lines.
BACKGROUND TO THE INVENTION
The maintenance of overland electricity transmission lines may require the replacement of such lines (also referred to as cables). When replacing a cable, the rest of the transmission structure, including lower cables, the towers, support cables and the like, are at risk. During replacement of the cable or after replacement the replacement cable may fall onto such lower items and cause damage. The damage is exacerbated when the transmission line is live. In many cases, the live cables are switched off when a cable is being replaced to guard against accidental interference and/or to protect human maintenance personnel.
In most transmission lines, the earth or ground cable is the uppermost cable spanned between pylons or towers. Power transmission lines cannot be readily switched off at will, especially where they supply clients such as factories and the like. Cooperation with clients might be required. Such cooperation and advance planning increases the cost and time of maintenance.
As stated above, one of the biggest dangers is that a span of a cable being replaced or the replacement cable itself falls onto the power transmission lines. If the power transmission lines are not switched off, both the electrical equipment associated there with and the cables themselves may be damaged.
OBJECT OF THE INVENTION
It is an object of this invention to provide a cable replacement safety system and method which, at least partially, alleviate some of the above-mentioned difficulties.
SUMMARY OF THE INVENTION
In accordance with this invention there is provided a cable replacement safety method comprising the steps of:
- supporting an elongate catching means between at least two cable support structures underneath a cable to be replaced; and
- replacing the cable with a replacement cable whilst lower cables transmit electricity. The method further includes any one or more of the steps of:
- a worker ascending the cable support structure or tower;
- installing guide pulleys at intervals along the height of the tower;
- conducting an HV test on the earth wire being the wire spanned uppermost between two towers;
- installing working earths and ensuring that the working earths are of sufficient length and are coiled if necessary;
- creating equipotential zones;
- installing nonconductive hand lines, one between phase conductors onto earth peak and one in or outside the tower;
- placing of the catching means and a recovery line underneath the tower;
- providing for the catching means to be an elongate net structure;
- lifting a tug to the top of the tower; alternatively, installing manually operable lines between towers; - installing the tug to the existing cable to be replaced, being the uppermost earth wire or cable;
- installing a support bracket onto the earth peak;
- ensuring that the support bracket includes a roller and that it is connected with working earths lines to parts of the tower; - putting a front end of the net together with a front end of the recovery line up the tower, over the support bracket and attaching it to the tug;
- moving the tug away from the tower toward a second tower thereby pulling the net over the bracket; - attaching securing means in the form of rib cage brackets at regular intervals to the cable to be replaced to support the net so that the net forms a concave receptacle at least underneath the cable to be replaced;
- attaching securing means in the form of rib cage brackets at regular intervals to the cable to be replaced to support the net so that the net forms a receptacle at least partially surrounding the cable to be replaced; or
- pulling the tug from the 1 st tower to the 2nd tower whilst attaching further rib cage brackets at regular intervals; The method further includes the step of cutting the cable to be replaced and attaching a front end of the new cable to a rear end of the cable to be replaced and pulling the cable to be replaced through the rib cage brackets thereby pulling the new cable into position. The method further includes the step of the cable being any type of overhead cable such as an overhead transmission ground cable, high-tension cable, optical fibre overhead ground wire (OPGW), conductor stringing or crossing lines.
This invention extends to a cable replacement system comprising: an elongate catching means attached to a number of securing means with the securing means attached to a cable to be replaced.
There is provided for the elongate catching means to be a net. A further feature of the invention provides for the securing means to depend from the cable to be replaced so that the net is supported by the securing means underneath the cable to be replaced.
There is also provided for the securing means to be a ring-shaped bracket or rib cage bracket having hook formations.
The hook formations are at an outer circumference of the rib cage bracket.
The rib cage bracket has an upper roller that engages on top of the line to be replaced.
Parts of the net, such as at least outer elongate edges thereof, are attached to the hook formations so that the net forms a concave receptacle when attached to two spaced apart rib cage brackets.
A still further feature of the invention provides for a recovery line to run together with the net with its front end attached to a foremost rib cage bracket or to a net puller pulley or to a front end of the net.
There is provided for the recovery line to be supported on a recovery line lower roller of the rib cage bracket.
A still further feature of the invention provides for the cable to be any type of overhead cables such as an overhead transmission ground cable, optical fibre overhead ground wire (OPGW) conductor stringing and/or crossing lines. These and other features of the invention are described in more detail below.
BRIEF DESCRIPTION OF THE DRAWINGS One embodiment of the invention is described below, by way of example only, and with reference to the drawings in which:
Figure 1 shows a perspective view schematic diagram of a power transmission line;
Figure 2 shows a close-up view of a tower of the power transmission line of figure 1 , in perspective view; and
Figures 3 to 12 show a sequence of a method in accordance with the invention.
DETAILED DESCRIPTION OF THE DRAWINGS
With reference to the drawings a transmission line is generally indicated by reference numeral 1 . Like features are indicated by like numerals. The transmission line 1 includes a number of towers 2a, 2b and 2c. Uppermost cables 3 are earth cables and live transmission cables 4 are supported underneath the earth cable 3. All these cables are spanned between the towers as is known in the art. Once installed, working earth lines 5 are connected between the earth cable 3 and the towers. Pulleys 6 are attached along the height of a tower with an uppermost pulley attached to an earth peak. The pulleys 6 may also be connected to the tower with working earth cables.
The cable replacement system includes an elongate catching means 8 attached to several securing means 10 with the securing means attached to a cable to be replaced
14. The elongate catching means is a net 8 and is attached to the securing means 10 which is a ring-shaped bracket or rib cage bracket having at least two hooks 11 on its operatively left and right and operatively upper circumference.
The rib cage brackets 10 include centrally located sets of pulleys with an uppermost pulley 12 located on a cable to be replaced 14. A lowermost pulley 13 supports a recovery line 9 as is further described below.
The rib cage bracket 10 is hinged or might otherwise be broken so that it opens for installation over the line to be replaced and for inserting the recovery line. A securing lever 18 may be opened and closed to selectively engage the rib cage bracket 10 with the line to be replaced 14 and/or the recovery line 9.
Outer edges of the net 8 is engaged with the hooks 11 so that the net 8 forms a concave receptacle at least underneath but ideally at least partially surrounding the line to be replaced as seen in figures 11 and 12. The recovery line 9 runs together with the net 8, inside thereof and attaches to a net puller pulley 17. The net puller pulley 17 and/or a front end of the net 8 and/or the recovery line 9 are attached to a tug 7 for initial installation as described further below. In use, a worker ascends a first tower 2a and may attach pulleys 6 along the height of the tower. The worker will at least attach an uppermost pulley 6 at an earth peak of the tower. The worker conducts an HV test on the earth wire and installs the working earth wires. Equipotential zones are created and nonconductive hand lines are also installed, one between phase conductors onto earth peak and one in or outside the tower. The net 8 and the recovery line 9 or rope is placed underneath the tower and then hoisted up together so that the front ends pass through a bracket 15 that has an elongate roller 16 for supporting both the net 8 and the recovery line 9. At this point the net 8 and recovery line 9 may be connected to the net puller pulley 17 or it may be connected to the tug 7.
The tug 7 is then used to pull the net 8 and the recovery line 9 towards the second tower 2b. Rib cage brackets 10 are attached to the cable to be replaced and to the net at regular intervals as the net and recovery line are being pulled towards the second tower so as to shape the net to form an elongate concave receptacle.
Once the net is installed as described above, the cable to be replaced can be cut in close proximity to tower 2a and a front end of a replacing table can be attached to a rear end (the cut off end) of the cable to be replaced. The further end of the cable to be replaced can also be cut and can then be pulled so that the replacing cable is pulled through successive rib cage brackets 10 until it reaches the further end where the cable to be replaced was cut.
The front and rear ends of the replacing cable can now be attached to the parts of the existing cable. The recovery line can now be used to retrieve the net 8 and the rib cage brackets 10.
The replacement of the cable was thus done without any risk of the replacing cable or the cable to be replaced interfering with the rest of the transmission structure, such as by falling onto the live cables or any of the towers or any other part of the transmission system. If a problem occurred, the net 8 would have caught a falling cable thus preventing any damage.
It is envisaged that the system and method described herein will be convenient to use in that there would be no need to cut the power when a cable is replaced.
It will be appreciated by those skilled in the art that the invention is not limited to the precise details as described herein and that many other embodiments are possible without departing from the scope of the invention. For example, instead of using the tug, manually operable or machine operable lines may be installed between successive towers or alternating towers.
The invention is not limited to replacing of earth cables and any type of cable, line, wire, optical fibre overhead ground wire (OPGW), high-tension cable, conductor stringing and/or crossing lines can be replaced by the system and method.

Claims

1. A cable replacement safety method comprising the steps of: supporting an elongate catching means between at least two cable support structures underneath a cable to be replaced; and replacing the cable with a replacement cable whilst lower cables transmit electricity.
2. The method of claim 1 further includes any one or more of the steps of:
- a worker ascending the cable support structure or tower;
- installing guide pulleys at intervals along the height of the tower;
- conducting an HV test on the earth wire being the wire spanned uppermost between two towers;
- installing working earths and ensuring that the working earths are of sufficient length and are coiled if necessary;
- creating equipotential zones;
- installing nonconductive hand lines, one between phase conductors onto earth peak and one in or outside the tower;
- placing of the catching means and a recovery line underneath the tower;
- providing for the catching means to be an elongate net structure;
- lifting a tug to the top of the tower;
- installing manually operable lines between towers;
- installing the tug to the existing cable to be replaced, being the uppermost earth wire or cable;
- installing a support bracket onto the earth peak; - ensuring that the support bracket includes a roller and that it is connected with working earths lines to parts of the tower;
- putting a front end of the net together with a front end of the recovery line up the tower, over the support bracket and attaching it to the tug;
- moving the tug away from the tower toward a second tower thereby pulling the net over the bracket;
- attaching securing means in the form of rib cage brackets at regular intervals to the cable to be replaced to support the net so that the net forms a concave receptacle at least underneath the cable to be replaced;
- attaching securing means in the form of rib cage brackets at regular intervals to the cable to be replaced to support the net so that the net forms a receptacle at least partially surrounding the cable to be replaced; or
- pulling the tug from the tower to a second tower whilst attaching further rib cage brackets at regular intervals;
3. The method of claims 1 or 2 further includes the step of cutting the cable to be replaced and attaching a front end of the new cable to a rear end of the cable to be replaced and pulling the cable to be replaced through the rib cage brackets thereby pulling the new cable into position.
4. The method of any of the preceding claims further includes the cable to be any one or more of the following types of lines:
- overhead transmission ground cable;
- high-tension cable;
- optical fibre overhead ground wire (OPGW); conductor stringing; or crossing lines.
5. A cable replacement system comprising: an elongate catching means attached to a number of securing means with the securing means attached to a cable to be replaced.
6. The cable replacement system as claimed in claim 5 in which the elongate catching means is a net.
7. The cable replacement system as claimed in any one of claims 4 or 5 in which the securing means is suspended from the cable to be replaced so that the net is supported by the securing means at least underneath the cable to be replaced.
8. The cable replacement system as claimed in any one of claims 4 or 5 in which the securing means is suspended from the cable to be replaced so that the net is supported by the securing means at least partially surrounding the cable to be replaced.
9. The cable replacement system as claimed in any one of claims 4 to 8 in which the securing means is a ring-shaped bracket having hook formations.
10. The cable replacement system as claimed in any one of claims 4 to 8 in which the securing means is a rib cage bracket having hook formations.
11.The cable replacement system as claimed in any one of claims 4 to 9 in which the hook formations are at an outer circumference of the bracket.
12. The cable replacement system as claimed in any one of claims 4 to 10 in which the bracket has an upper roller that engages on top of the line to be replaced.
13. The cable replacement system as claimed in any one of claims 4 to 11 in which parts of the net, such as at least outer elongate edges thereof, are attached to the hook formations
14. The cable replacement system as claimed in any one of claims 4 to 12 in which the net forms a concave receptacle when attached to two spaced apart rib cage brackets.
15. The cable replacement system as claimed in any one of claims 4 to 13 in which a recovery line runs together with the net with its front end attached to a foremost rib cage bracket.
16. The cable replacement system as claimed in any one of claims 4 to 13 in which a recovery line to runs together with the net with its front end attached to a net puller pulley.
17. The cable replacement system as claimed in any one of claims 4 to 13 in which a recovery line to runs together with the net with its front end attached to a front end of the net.
18. The cable replacement system as claimed in any one of claims 4 to 16 in which the recovery line is supported on a recovery line lower roller of the rib cage bracket.
19. The cable replacement system as claimed in any one of claims 4 to 18 in the recovery line is a rope.
PCT/IB2021/061172 2021-01-10 2021-12-01 Cable replacement safety system and method WO2022149013A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA202005620 2021-01-10
ZA2020/05620 2021-01-10

Publications (1)

Publication Number Publication Date
WO2022149013A1 true WO2022149013A1 (en) 2022-07-14

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Application Number Title Priority Date Filing Date
PCT/IB2021/061172 WO2022149013A1 (en) 2021-01-10 2021-12-01 Cable replacement safety system and method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115133457A (en) * 2022-07-20 2022-09-30 国网青海省电力公司西宁供电公司 Obstacle crossing device for power transmission line erection

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007037314A (en) * 2005-07-28 2007-02-08 Kurihara Kogyo Co Ltd Electric wire relaying method and protective net used for it
CN108512115A (en) * 2018-04-12 2018-09-07 浙江省送变电工程有限公司 Utilize the block system and its installation, method for dismounting of auxiliary cross-arm spanning the transmission line
WO2020247988A2 (en) * 2019-06-07 2020-12-10 Bester Francois Retief Apparatus for attaching restraining means to a line

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007037314A (en) * 2005-07-28 2007-02-08 Kurihara Kogyo Co Ltd Electric wire relaying method and protective net used for it
CN108512115A (en) * 2018-04-12 2018-09-07 浙江省送变电工程有限公司 Utilize the block system and its installation, method for dismounting of auxiliary cross-arm spanning the transmission line
WO2020247988A2 (en) * 2019-06-07 2020-12-10 Bester Francois Retief Apparatus for attaching restraining means to a line

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115133457A (en) * 2022-07-20 2022-09-30 国网青海省电力公司西宁供电公司 Obstacle crossing device for power transmission line erection
CN115133457B (en) * 2022-07-20 2024-04-12 国网青海省电力公司西宁供电公司 Obstacle crossing device for power transmission line erection

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