EP1021857A1 - Aerially installed communications cable - Google Patents
Aerially installed communications cableInfo
- Publication number
- EP1021857A1 EP1021857A1 EP98905019A EP98905019A EP1021857A1 EP 1021857 A1 EP1021857 A1 EP 1021857A1 EP 98905019 A EP98905019 A EP 98905019A EP 98905019 A EP98905019 A EP 98905019A EP 1021857 A1 EP1021857 A1 EP 1021857A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coaxial cable
- cable
- support strand
- length
- communications
- 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.)
- Withdrawn
Links
- 239000004020 conductor Substances 0.000 claims abstract description 35
- 238000009434 installation Methods 0.000 claims abstract description 15
- 230000001681 protective effect Effects 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 12
- 230000008602 contraction Effects 0.000 description 12
- 238000005452 bending Methods 0.000 description 8
- 239000006260 foam Substances 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000000737 periodic effect Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- -1 polyethylene Polymers 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000012636 effector Substances 0.000 description 3
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000001932 seasonal effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 241000723418 Carya Species 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- H02G7/05—Suspension arrangements or devices for electric cables or lines
- H02G7/06—Suspensions for lines or cables along a separate supporting wire, e.g. S-hook
-
- 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
- H02G7/05—Suspension arrangements or devices for electric cables or lines
Definitions
- the present invention relates broadly to communications cable and more particularly to the aerial installation of communications cable suitable for the transmission of RF signals.
- the coaxial cables commonly used today for the transmission of RF signals include an inner conductor, a metallic sheath surrounding the inner conductor and serving as an outer conductor, and optionally a protective jacket which surrounds the metallic sheath.
- a dielectric surrounds the inner conductor and electrically insulates it from the surrounding metallic sheath.
- One exemplary cable construction uses an expanded foam dielectric to surround the inner conductor and fill the space between the inner conductor and the surrounding metallic sheath.
- an air dielectric coupled with polymer spacers in the form of disks is used to support the center conductor in spaced relation from the outer conductor.
- coaxial cable for voice, data and video transmissions.
- the coaxial trunk and distribution cable is installed aerially, e.g., hung between utility poles .
- One concern in the installation of the coaxial cable is the generally limited bending properties which are characteristic of coaxial cable. Specifically, in installing the coaxial cable, care must be exercised to avoid causing crimps or bends in the coaxial cable because any such crimps or bends will adversely affect the signal propagation properties of the cable. The crimps or bends may also serve as sites for structural failure of the cable after repeated cycles of thermal expansion and contraction due to seasonal and daily temperature changes .
- the conventional method of installing aerial coaxial cable is generally a time consuming process.
- a support strand 10 or "messenger” is installed first by affixing the strand to a utility pole 12 and directing it along pulleys 14 or by other means to successive utility poles 16.
- the coaxial cable 18 is then installed by pulling the coaxial cable along the length of the support strand 10 using pulleys 20 hung from the support strand or other means.
- the coaxial cable 18 is then affixed to the support strand 10 by lashing or tying the coaxial cable to the support strand as shown in Figures 3 and 4.
- the coaxial cable 18 is formed into expansion loops 24 as shown in Figure 4 to accommodate the expansion and contraction of the coaxial cable during seasonal and daily temperature changes.
- numerous steps must be performed to aerially install the communications cable.
- One alternative is to provide the coaxial cable and the support strand or messenger in the same protective jacket and to hang the support strand and the coaxial cable in the same step.
- this particular construction still requires the separate step of forming expansion loops in the coaxial cable to account for thermal expansion.
- expansion loops may sufficiently address the problem of thermal expansion and contraction, there are various problems associated with the use of expansion loops.
- the expansion loops are flexed many times during the life of the cable.
- localized stress on the expansion loop may lead to cable failure in the loop, therefore affecting a portion if not all of the propagated signal .
- the tendency of the expansion loop to fail thus necessitates early replacement of the cable.
- the necessity of manually forming expansion loops during installation provides an opportunity for creating undesired crimps or bends in the cable.
- the formation of expansion loops in the coaxial cable during its installation is time-consuming.
- the present invention provides a communications cable that can undergo thermal expansion and contraction without the need for expansion loops.
- the communications cable of the invention is provided as a single unit thereby allowing the communications cable to be installed quickly in one pass.
- the present invention provides a communications cable having a support strand and at least one coaxial cable wound about the support strand in such a way that the coaxial cable can accommodate dimensional changes resulting from thermal expansion and contraction.
- the coaxial cable is helically wound or "stranded" about the support strand or messenger using a specified relationship of excess coaxial cable length to support strand length.
- the coaxial cable includes an inner conductor, a dielectric surrounding the inner conductor, and an outer tubular metallic sheath surrounding the dielectric.
- the dielectric is an expanded foam dielectric such as a closed cell polyethylene foam.
- the coaxial cable may additionally include a protective jacket which surrounds the metallic sheath.
- Aerially installed coaxial cables of the type to which the present invention is directed are connected at their ends to other components in the cable system by electrical connectors .
- the cable may extend for hundreds or thousands of feet between connectors. Consequently, thermal expansion and contraction can generate very high tensile forces at the electrical connectors, which can degrade the signal propagation properties of the cable or even cause the coaxial cable to pull out of the connector, disrupting the cable system.
- the coaxial cable in a helically wound configuration around the support strand, and by controlling the ratio of the length of the coaxial cable to the length of the support strand within prescribed parameters of between 1.005 and 1.015, the cable can effectively withstand severe thermal expansion and contraction without the need for expansion loops. In a preferred embodiment, this ratio is maintained at between 1.006 and 1.010.
- the coaxial cable is also preferably wound around the support strand using varying lay lengths thereby limiting the introduction of structural return loss (SRL) or periodic impedance mismatches which negatively affect the transmitted signal.
- SRL structural return loss
- the present invention includes a method of forming a communications cable.
- the method generally comprises advancing a tensioned support strand and advancing at least one coaxial cable comprising an inner conductor, a dielectric surrounding the inner conductor, and an outer tubular metallic sheath surrounding the dielectric.
- the advancing coaxial cable helically is guided around the advancing support strand along the length of the support strand while the ratio of the length of the coaxial cable to the length of the support strand is controlled at between 1.005 and 1.015.
- the coaxial cable is also preferably wrapped helically around the support strand using varying lay lengths.
- the communications cable of the invention may be installed relatively quickly in one pass between utility poles, without the need to form expansion loops in the coaxial cable. Therefore, the coaxial cable is generally not subject to the localized stress that occurs in the expansion loops.
- the coaxial cable is helically wound around the support strand with the ratio of the length of the coaxial cable to the length of the support strand controlled at between 1.005 and 1.015, the coaxial cable can undergo thermal expansion and contraction without pulling out of the connectors.
- any degradation of the transmitted RF signals resulting from periodic damage to the coaxial cable is minimized.
- Figures 1-4 are schematic views showing a prior art method of aerially installing a communications cable by sequentially hanging a support strand, hanging a coaxial cable, affixing the coaxial cable to the support strand and forming expansion loops in the coaxial cable.
- Figure 5 is a perspective view of an aerially installed communications cable according to the invention.
- Figure 6 is a cross-sectional view of the communications cable of Figure 5 taken along lines 6-6 of Figure 5 illustrating the support strand and coaxial cable.
- Figure 7 is a schematic view of a method of forming a communications cable according to the invention.
- Figure 8 is a cross-sectional view taken along lines 8-8 of Figure 7 and showing how the coaxial cable is wound about the support strand.
- Figure 9 is a schematic view of a method of aerially installing a communications cable in one pass according to the invention.
- a communications cable 30 comprising a support strand 32 and a coaxial cable 34.
- the coaxial cable 34 is helically wound around the support strand 32 along the length of the support strand.
- one or more additional coaxial cables oriented parallel to coaxial cable 34 may also be wound helically around the support strand 32.
- other types of cables may also be wound helically around the support strand 32 parallel to the coaxial cable 34.
- the communications cable 30 is typically installed aerially and hung between two predetermined locations, at least one of which is preferably elevated.
- the communications cable 30 may be hung between a utility pole 36 and a second location, typically a second utility pole.
- the communications cable 30 is affixed to the utility pole 36 usually by affixing the support strand 32 to the pole by any suitable means such as clamping means 38.
- the communications cable 30, and particularly, the coaxial cable 34 are typically used for the transmission of RF signals for broadband telecommunications applications such as data, voice, and video applications.
- the support strand 32 used in the communications cable 30 of the invention is preferably relatively strong to support the weight of the coaxial cable 34 or cables helically wound around the support strand.
- An especially suitable material for the support strand 32 is a galvanized steel cable.
- the support strand 32 may be further surrounded by a protective jacket (not shown) if desired. Suitable materials for the protective jacket include thermoplastic coating materials such as polyethylene, polyvinyl chloride, polyurethane and various rubbers.
- the coaxial cable 34 used in the invention is generally of the type which transmits RF signals, such as for broadband applications having a bandwidth of up to about 1 GHz, e.g., voice, data and video applications.
- trunk and distribution cable commonly used for these applications may be used.
- the coaxial cable 34 comprises an inner conductor 40, a dielectric 42 surrounding the inner conductor, and a metallic sheath 44 which acts as an outer conductor surrounding the dielectric .
- the coaxial cable 34 may further include a protective jacket 46 surrounding the metallic sheath as illustrated in Figures 5 and 6.
- the inner conductor In the coaxial cable 34, the inner conductor
- the inner conductor 40 is formed of a suitable electrically conductive material such as copper or aluminum.
- the inner conductor 40 is solid copper, copper tubing or a copper-clad aluminum. In the embodiment illustrated, only a single inner conductor 32 is shown, as this is the most common arrangement for coaxial cables of the type used for transmitting RF signals.
- the inner conductor 40 is surrounded by a dielectric 42 such as air or a polymeric material .
- a dielectric 42 such as air or a polymeric material .
- the dielectric 42 is a solid continuous polymeric material and may be adhesively bonded to the inner conductor 40 using a suitable adhesive such as an ethylene-acrylic acid copolymer.
- exemplary polymers for the dielectric 42 include polyethylene, polypropylene, and polystyrene.
- the dielectric should be an expanded closed cell foam dielectric.
- the foam dielectric is high density polyethylene or a blend of high and low density polyethylene.
- the foam dielectric has a density of less than about 0.28 g/cc.
- an outer tubular metallic sheath 44 Closely surrounding the dielectric 42 is an outer tubular metallic sheath 44.
- the sheath 44 is adhesively bonded to the dielectric 42 using a suitable adhesive such as an ethylene-acrylic acid copolymer to support the sheath during bending of the coaxial cable 34.
- the sheath 44 is also preferably characterized by being both mechanically and electrically continuous. This allows the sheath 44 to effectively serve to mechanically and electrically seal the cable against outside influences as well as to seal the cable against leakage of RF radiation.
- the metallic sheath 44 may be formed of various electrically conductive metals such as copper or aluminum. For voice, data and video applications, the outer diameter of the metallic sheath is typically between 0.5 inches and 1.0 inch.
- the outer surface of the metallic sheath 44 may be surrounded by a protective jacket 46.
- Suitable compositions for the outer protective jacket 46 include thermoplastic coating materials such as polyethylene, polyvinyl chloride, polyurethane and various rubbers.
- the protective jacket 46 is adhesively bonded to the sheath 44 with a suitable adhesive such as an ethylene-acrylic acid copolymer.
- the coaxial cable 34 used in the present invention is designed to have good flexibility, i.e., enhanced bending characteristics, thereby enabling the coaxial cable to be readily formed into a helical configuration around the support strand 32 without causing crimps, bends or other defects in the coaxial cable.
- the coaxial cable used in the present invention should have a minimum bend radius of less than 10 cable diameters. The minimum bend radius is determined by progressively bending the cable over smaller and smaller mandrels of uniform radius. After each bend, the cable is examined for any signs of waviness or buckling. The smallest radius mandrel in which the first signs of waviness occur is defined as the minimum bend radius .
- a relatively thin metallic sheath 44 is preferably used.
- the preferred coaxial cable for use in the present invention has a tubular metallic sheath 44 with a wall thickness selected so as to maintain a T/D ratio (ratio of wall thickness to outer diameter) of less than 2.5 percent.
- adhesively bonding the sheath 44 to the foam dielectric 42 increases the flexibility of the coaxial cable 34 by supporting the sheath 44 in bending to prevent damage to the coaxial cable .
- increased core (inner conductor 40 and dielectric 42) stiffness in relation to sheath 44 stiffness is beneficial to the bending characteristics of the coaxial cable 34.
- the coaxial cables 34 used in the invention preferably have a core to sheath stiffness ratio of at least 5.
- One preferred cable having suitable flexibility for use in the invention is QR cable, available from CommScope, Inc. in Hickory, North Carolina.
- the core to sheath stiffness ratio described above is determined by independently evaluating the compressive stiffness of the core (inner conductor 40 and dielectric 42) and the outer conductor 44 as would be observed from its side.
- a fixed length (1 inch) sample of core and outer conductor is placed in a compressive load fixture (universal tester) and deflected a defined amount .
- this deflection is defined as 12% of its respective diameter.
- the ratio of stiffness is then expressed as a ratio of the recorded loads at the defined deflection.
- the coaxial cable 34 used in the invention, and specifically, the conductors used in the coaxial cable 34 are subject to thermal expansion and contraction because of seasonal and daily temperature changes which may cause flexure in the cable and possibly damage to the cable.
- the coaxial cable 34 is helically wound around the support strand 32 without the existence of expansion loops, the thermal expansion (contraction) of the coaxial cable is distributed throughout the cable and does not result in localized stress to the cable.
- the coaxial cable 34 is preferably helically wound around the support strand 32 using varying lay lengths L thereby limiting the introduction of structural return loss (SRL) or periodic impedance mismatches which negatively affect the transmitted RF signal .
- SRL structural return loss
- the coaxial cable 34 used in the invention is preferably tightly wrapped helically around the support strand 32 such that the coaxial cable 34 contacts the support strand along a majority of the length of the support strand. Therefore, the coaxial cable 34 is supported by the support strand 32 without the need for lashing or tying the coaxial cable to the support strand.
- the tightness of the coaxial cable 34 around the support strand 32 may be described as a ratio of the length of coaxial cable used in the communications cable 30 to the length of support strand 32 used in the communications cable. For example, the excess length of coaxial cable 34 per 100 feet of support strand 32 is between about 6 and 18 inches and typically between about 8 and 12 inches.
- the ratio of the length of straight coaxial cable 34 to the length of support strand 32 is between about 1.005 and 1.015 and typically is between about 1.006 and 1.010. As will be understood, the excess length, and thus the above ratio, may also be determined by straightening out the coaxial cable 34 used in the communications cable.
- the ratio of the length of straight coaxial cable 34 to the length of support strand 32 is critical to the manufacture and effective installation of the stranded communications cables of the invention. Specifically, in stranded communications cables which have a ratio below 1.005, the coaxial cable is subject to high tensile forces during periods of thermal contraction which can cause the coaxial cable to pull out of connectors. Likewise, if this ratio is greater than 1.015, the coaxial cable is too loosely wound around the support strand and manufacture of the stranded cables becomes difficult to control. In this case, the coaxial cable can collide with process machinery during manufacture resulting in damage to the coaxial cable.
- coaxial cable tends to form large loops during manufacture which makes it difficult to collect the cable on reels and can make installation of the cable on utility poles extremely difficult.
- This ratio has been particularly critical to the manufacture and installation of large diameter cables, i.e., cables wherein the diameter of the tubular metallic sheath 44 is greater than 0.5 inches .
- the communications cable 30 of the invention is constructed prior to installation.
- the method of forming the communications cable 30 comprises advancing the support strand 32 and the coaxial cable 34 from supply reels 50 and 52, respectively, by uncoiling the support strand and the coaxial cable from the reels.
- the support strand 32 and the coaxial cable 34 are preferably drawn with a predetermined amount of tension from the reels 50 and 52, by drawing means 54.
- the support strand 32 and coaxial cable 34 are subsequently guided into a strander 56 which aligns the support strand and coaxial cable into a parallel orientation.
- the support strand 32 and the coaxial cable 34 then advance into an end effector 58 which contains biasing means for bending the coaxial cable in a helical configuration tightly around the support strand.
- a series of rollers 59 biases and guides the coaxial cable 34 around the support strand 32.
- the path P of the coaxial cable 34 around the support strand 32 is generally circular and may be either clockwise or counterclockwise.
- the coaxial cable 34 is preferably flexible to allow the coaxial cable to be wrapped helically around the support strand 32 without causing damage to the coaxial cable.
- one or more additional cables e.g. coaxial cables may be aligned parallel to the coaxial cable 34 and wrapped helically around the support strand 32.
- the coaxial cable of the invention is manufactured such that the ratio of the length of straight coaxial cable 34 to the length of support strand 32 is between about 1.005 and 1.015 and typically is between about 1.006 and 1.010.
- the coaxial cable 34 is wrapped around the support 32 using varying lay lengths L.
- the lay length L is defined as the distance between the points in which the center 64 of the coaxial cable 34 crosses directly over the center 66 of the support strand 32.
- the lay length L oscillates within a predetermined range between about 24 and 32 inches.
- the lay length L may oscillate between 25 and 27 inches or between 26 and 30 inches.
- the varied lay length L prevents periodic structural damage to the coaxial cable 34 and therefore limits the formation of structural return loss (SRL) or periodic impedance mismatches which negatively affect the transmitted RF signal such as by dissipating the signal corresponding to a certain range of frequencies .
- the coaxial cable 34 exits the end effector 58 helically wrapped around the support strand 32 to form the communications cable 30.
- the communications cable 30 is continuously drawn by the drawing means 54 located downstream from the end effector 58 and may be collected on a suitable container, such as reel 60, for storage and shipment.
- the communications cable 30 of the invention is especially suitable for aerial installation in which at least one of the locations onto which the communications cable is affixed is elevated from the ground.
- a predetermined length of communications cable 30 is provided such as by uncoiling the communications cable from a suitable container such as reel 60.
- the communications cable 30 is guided to a first aerial location such as a first utility pole 62 and a first location on the support strand 32 is affixed to the utility pole by suitable means such as clamping means 18 ( Figure 1) .
- a length of the communications cable 30 is then directed from first utility pole 62 to a second aerial location such as second utility pole 64.
- the communications cable may be guided aerially by suitable means such as pulley 66.
- the communications cable 30 may then be installed at other aerial locations in the same fashion.
- the installation of the communications cable 30 is a one pass process and does not require separate installation of the support strand 32 and the coaxial cable 34. Therefore, the installation can be achieved relatively quickly.
- the communications cable 30 of the invention is not subject to localized stress from thermal expansion because the expansion is distributed along the length of the coaxial cable 34.
- the lay length L of the coaxial cable 34 around the support strand is varied 32. As a result, if periodic damage to the coaxial cable 34 occurs, the degradation of the RF signals transmitted by the coaxial cable will be minimized.
Landscapes
- Communication Cables (AREA)
- Aerials With Secondary Devices (AREA)
- Near-Field Transmission Systems (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US848512 | 1986-04-07 | ||
US797555 | 1991-11-22 | ||
US79755597A | 1997-02-06 | 1997-02-06 | |
US84851297A | 1997-04-28 | 1997-04-28 | |
PCT/US1998/002481 WO1998035416A1 (en) | 1997-02-06 | 1998-02-05 | Aerially installed communications cable |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1021857A1 true EP1021857A1 (en) | 2000-07-26 |
Family
ID=27121892
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98905019A Withdrawn EP1021857A1 (en) | 1997-02-06 | 1998-02-05 | Aerially installed communications cable |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1021857A1 (zh) |
JP (1) | JP3308547B2 (zh) |
KR (1) | KR100355443B1 (zh) |
CN (1) | CN1237282A (zh) |
AU (1) | AU729827B2 (zh) |
BR (1) | BR9807820A (zh) |
TW (1) | TW375742B (zh) |
WO (1) | WO1998035416A1 (zh) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3791891B2 (ja) * | 2000-03-13 | 2006-06-28 | 大明株式会社 | ケーブル架設工法 |
SE531308C2 (sv) * | 2006-11-03 | 2009-02-17 | Abb Research Ltd | Högspänningskabel |
CN104944217A (zh) * | 2015-06-26 | 2015-09-30 | 浙江特拉建材有限公司 | 一种电线防断装置 |
CN107104394B (zh) * | 2017-04-30 | 2019-01-04 | 芜湖泰庆电子科技有限公司 | 一种特高压电缆铺设过程中跨越排污管道的方法 |
CN107154600B (zh) * | 2017-04-30 | 2019-04-19 | 广东良实机电工程有限公司 | 一种特高压电缆铺设过程中判断电缆是否伸直的方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2473965A (en) * | 1947-01-08 | 1949-06-21 | American Steel & Wire Co | Self-supporting aerial electric conducting cable |
US2870327A (en) * | 1953-03-03 | 1959-01-20 | Bell Telephone Labor Inc | Electronic probability circuit |
US2870237A (en) * | 1958-04-08 | 1959-01-20 | Charles L Wilkins | Multiple conductor service cable insulator |
US4832442A (en) * | 1987-07-17 | 1989-05-23 | United Ropeworks (U.S.A.) Inc. | Method and apparatus for aerial installation of fiber optic cables |
-
1998
- 1998-02-05 AU AU62743/98A patent/AU729827B2/en not_active Ceased
- 1998-02-05 WO PCT/US1998/002481 patent/WO1998035416A1/en active IP Right Grant
- 1998-02-05 CN CN98801192A patent/CN1237282A/zh active Pending
- 1998-02-05 EP EP98905019A patent/EP1021857A1/en not_active Withdrawn
- 1998-02-05 JP JP53498098A patent/JP3308547B2/ja not_active Expired - Fee Related
- 1998-02-05 BR BR9807820-8A patent/BR9807820A/pt not_active IP Right Cessation
- 1998-02-05 TW TW087101534A patent/TW375742B/zh active
- 1998-02-05 KR KR1019997007001A patent/KR100355443B1/ko not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9835416A1 * |
Also Published As
Publication number | Publication date |
---|---|
KR100355443B1 (ko) | 2002-10-11 |
CN1237282A (zh) | 1999-12-01 |
JP3308547B2 (ja) | 2002-07-29 |
WO1998035416A1 (en) | 1998-08-13 |
BR9807820A (pt) | 2000-03-08 |
AU729827B2 (en) | 2001-02-08 |
JP2000513199A (ja) | 2000-10-03 |
TW375742B (en) | 1999-12-01 |
AU6274398A (en) | 1998-08-26 |
KR20000070745A (ko) | 2000-11-25 |
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