GB2236324A - Method of protecting bare overhead conductors - Google Patents
Method of protecting bare overhead conductors Download PDFInfo
- Publication number
- GB2236324A GB2236324A GB9020489A GB9020489A GB2236324A GB 2236324 A GB2236324 A GB 2236324A GB 9020489 A GB9020489 A GB 9020489A GB 9020489 A GB9020489 A GB 9020489A GB 2236324 A GB2236324 A GB 2236324A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cross
- conductor
- composition
- grease
- grease composition
- 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- Withdrawn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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/32—Filling or coating with impervious material
- H01B13/322—Filling or coating with impervious material the material being a liquid, jelly-like or viscous substance
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Insulating Materials (AREA)
Description
VA/3794 Methods of Protecting Bare Overhead Conductors This invention
relates to methods ol protecting bare overhead conductors.
Bare composite overhead conductors for the transmission of high voltage electricity are treated with grease to prevent the ingress of moisture and thereby to avoid corrosion of the conductor. The grease is applied during fabrication of the conductor, and, as well as being present around the conductor, is present between the individual wires which form the composite conductor.
It is known for the grease to exude from the conductor and to form a large suspended MHp", which can give rise to electrical malfunctions of the conductor and which in any event denudes the conductor of its protection.
It is an object of the present invention to provide a method of protecting bare overhead conductors wherein this problem is overcome.
According to the present invention there is provided a method of protecting a bare overhead conductor characterised by: applying a grease composition containing a cross-linkable plastics agent to said conductor; and subjecting said conductor, with said composition applied, to a crosslinking influence to cause said plastics agent to cross-link to harden said composition, thereby to prevent denudation of said conductor of said composition.
A method in accordance with the present invention will now be described by way of example.
The method comprises applying to a bare composite overhead conductor during its fabrication a grease composition such that the grease composition surrounds the conductor and it present between the individual wires which form the composite conductor. The grease composition comprises a mixture of a grease commonly used in the United Kingdom to protect bare overhead conductors and sold in the United Kingdom under the brand name Castrol Rustilo 431 and the polyurethane acrylate sold in the United Kingdom by Lankro Chemicals limited under the brand name Photomer 6162. In the grease composition the Castrol Rustilo 431 and the Photomer 6162 are in the proportion by weight approximately 2011 respectively.
The conductor is then secured in place overhead where the ultra-violet radiation present in the sunlight to which the conductor is exposed causes cross-linking of the Photomer 431 present at the surface of the grease composition exposed to the sunlight, and thereby hardening of the grease composition at this surface. The Photomer 431 thus comprises a cross-linking plasticis agent in the method. Such hardening prevents denudation of"the conductor of the grease composition, in particular it prevents the formation of the aforementioned 'drip'. Further, if any cracking of the hardened surface occurs, for example, arising from movement of the conductor due to wind, such cracking is soon healed since any egression of the grease composition which has formerly not hardened from the inner region of the conductor through the cracking will Itself harden on exposure to the sunlight.
It is to be appreciated that cross-linkable plastics agents other than Photomer 431 may be used. For example, cross-linkable plastics agents comprising any other polyurethane acrylate, or any polyester acrylate or either of the following two acrylic monomers tetrahydrofurylacryl ate and tri methyl opropanet ri met hacry] ate may be used. Further, the crosslinkable plastics agent used may he cross-linkable under a cross-linking influence other than ultra-violet radiation, and the cross-linking influence may be applied during fabrication of the conductor. The grease of the grease composition need not comprise Castrol Rustilo 431. An example of another suitable grease Is a grease sold In the United Kingdom under the brand name Cableguard HS. This grease is also a standard bare overhead conductor protective grease.
It is also to be appreciated that the invention is applicable to single wire bare overhead conductors as well as composite bare overhead conductors comprising a plurality of single wires.
Claims (9)
1 A method of protecting a bare overhead conductor characterised by: applying a grease composition containing a cross-linkable plastics agent to said conductor; and subjecting said conductor. with said composition applied, to a cross-linking influence to cause said plastics agent to cross-link to harden said composition, thereby to prevent denudation of said conductor of said composition.
2. A method according to Claim 1 wherein said cross-linking influence causes cross-linking of said plastics agent only at the surface of the grease composition exposed to said cross-linking influence, thereby causing hardening of the grease composition only at this surface.
3. A method according to Claim 2 wherein said cross-linking influence comprises ultra-violet radiation.
4. A method according to Claim 3 wherein said ultra-violet radiation is that present in the sunlight to which said conductor, with said composition applied, is exposed whilst secured overhead.
5. A method according to Claim 3 wherein said conductor, with said composition applied, is subjected to said ultra-violet radiation during fabrication of said conductor.
6. A method according to Claim 4 or Claim 5 wherein said grease composition comprises a mixture of a standard bare overhead conductor protective grease and a cross-linkable plastics agent comprising one of the following: a polyurethane acrylate, a polyester acrylate, tetrahydrof uryl acryl ate, and tri methyl oprop anetri methacry late, in said grease composition said standard protective grease and said cross-linkable plastics agent being in the proportion by weight substantially 2011 respectively.
5-
7. A bare overhead conductor protected by a method according to any one of the preceding claims.
8. A grease composition for use in protecting a bare overhead conductor containing a cross-linkabale plastics agent capable of undergoing crosslinking under a cross-linking influence so as to harden said grease composition.
9. A conductor having had applied to it a grease composition according to Claim 8.
Published 1991 at The Patent Office. State House. 66171 HighHolbom. 1. ondonWC1R4TP. Further copies maybe obtained from.
Sales B. Unit 6. Nine Mile Point Cwmfelinfach. Cross Keys, Newport NP1 7HZ. Printed by Multiplex techniques ltd. St Mary Cray, Kent.
11---a r-fIinfnrh- Cross Revs. Newporr. n- j-------.Y------------_ ----I- - - -
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB898921776A GB8921776D0 (en) | 1989-09-27 | 1989-09-27 | Grease for overhead electric conductors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9020489D0 GB9020489D0 (en) | 1990-10-31 |
| GB2236324A true GB2236324A (en) | 1991-04-03 |
Family
ID=10663671
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB898921776A Pending GB8921776D0 (en) | 1989-09-27 | 1989-09-27 | Grease for overhead electric conductors |
| GB9020489A Withdrawn GB2236324A (en) | 1989-09-27 | 1990-09-19 | Method of protecting bare overhead conductors |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB898921776A Pending GB8921776D0 (en) | 1989-09-27 | 1989-09-27 | Grease for overhead electric conductors |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0420479A3 (en) |
| GB (2) | GB8921776D0 (en) |
| NO (1) | NO904182L (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1387095A (en) * | 1973-04-30 | 1975-03-12 | Gen Cable Corp | Filled communication cables with irradiated polyethylene insulation |
| GB1484949A (en) * | 1973-11-27 | 1977-09-08 | Siemens Ag | Guiding a strand-form material under a source of irradiation |
| EP0000646A1 (en) * | 1977-07-20 | 1979-02-07 | Akzona Incorporated | Process and apparatus for the radiation curing of cable insulation |
| US4705724A (en) * | 1986-03-03 | 1987-11-10 | Caschem, Inc. | Process for using ester plasticized polyurethanes for sealing electrical devices |
| US4705723A (en) * | 1986-03-03 | 1987-11-10 | Caschem, Inc. | Process for using ricinoleate plasticized polyurethanes for sealing electrical devices |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2229131A (en) * | 1989-03-17 | 1990-09-19 | Vactite Ltd | Coating electric conductors |
-
1989
- 1989-09-27 GB GB898921776A patent/GB8921776D0/en active Pending
-
1990
- 1990-09-19 GB GB9020489A patent/GB2236324A/en not_active Withdrawn
- 1990-09-19 EP EP19900310222 patent/EP0420479A3/en not_active Withdrawn
- 1990-09-26 NO NO90904182A patent/NO904182L/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1387095A (en) * | 1973-04-30 | 1975-03-12 | Gen Cable Corp | Filled communication cables with irradiated polyethylene insulation |
| GB1484949A (en) * | 1973-11-27 | 1977-09-08 | Siemens Ag | Guiding a strand-form material under a source of irradiation |
| EP0000646A1 (en) * | 1977-07-20 | 1979-02-07 | Akzona Incorporated | Process and apparatus for the radiation curing of cable insulation |
| US4705724A (en) * | 1986-03-03 | 1987-11-10 | Caschem, Inc. | Process for using ester plasticized polyurethanes for sealing electrical devices |
| US4705723A (en) * | 1986-03-03 | 1987-11-10 | Caschem, Inc. | Process for using ricinoleate plasticized polyurethanes for sealing electrical devices |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0420479A2 (en) | 1991-04-03 |
| GB9020489D0 (en) | 1990-10-31 |
| GB8921776D0 (en) | 1989-11-08 |
| EP0420479A3 (en) | 1992-06-17 |
| NO904182D0 (en) | 1990-09-26 |
| NO904182L (en) | 1991-04-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |