CN114301003A - Load switching method for flexible cable between adjacent strain towers - Google Patents
Load switching method for flexible cable between adjacent strain towers Download PDFInfo
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- CN114301003A CN114301003A CN202111405303.8A CN202111405303A CN114301003A CN 114301003 A CN114301003 A CN 114301003A CN 202111405303 A CN202111405303 A CN 202111405303A CN 114301003 A CN114301003 A CN 114301003A
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- flexible cable
- cable
- drainage wire
- flexible
- load
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000012546 transfer Methods 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000002788 crimping Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 231100000241 scar Toxicity 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 2
- 239000004703 cross-linked polyethylene Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
A load transfer method for flexible cables between adjacent tension towers. The invention discloses a load switching method based on a flexible cable capable of being repeatedly applied, and relates to the field of power line construction methods. Can produce the cross-over connection to having the overhead line at newly-built circuit overlap joint in-process, at present often adopt the hard cable to carry out the load switching, but the hard cable bend radius requires rigorously, can not curl wantonly and receive and release, mostly is single use, and reuse rate is low. The process of the invention is as follows: selecting a flexible cable capable of being repeatedly applied; manufacturing a cable terminal; erecting a flexible cable; when power is cut off for a short time, removing the drainage wire of the first strain tower and connecting the drainage wire with the flexible cable; the drainage wire of the second strain tower is disassembled and is connected with the other end of the flexible cable; and (5) after the newly-built line is lapped, removing the flexible cable, and hanging the drainage wire for recovering the flexible cable by using the cable tray for subsequent continuous use. According to the method, the flexible cable is adopted for temporary load transfer, so that repeated recycling connection and stringing operation of the temporary load transfer cable can be effectively realized, and the method is simpler and more convenient.
Description
Technical Field
The invention relates to the field of power line construction methods, in particular to a load switching method based on a flexible cable capable of being repeatedly applied.
Background
The condition that newly-built circuit alternately stridees across established circuit increases day by day, can produce the cross-over connection to having the overhead line at newly-built circuit overlap joint in-process, for guaranteeing safe distance and reliable power supply, often adopt crosslinked polyethylene cable to carry out the load switching, but crosslinked polyethylene cable bend radius requires strictly, can not curl freely and receive and release, mostly is single use, and reuse rate is low.
Disclosure of Invention
The technical problem to be solved and the technical task to be solved by the invention are to perfect and improve the prior technical scheme, and provide a load switching method based on a flexible cable capable of being repeatedly applied, so as to realize repeated use for many times. Therefore, the invention adopts the following technical scheme.
A load transfer method of a flexible cable between adjacent tension towers comprises the following steps:
1) selecting a flexible cable which can be repeatedly applied, wherein the length of the flexible cable is greater than the sum of the length of the tension resistant section and the heights of the two tension resistant towers;
2) manufacturing a cable terminal, and crimping a copper nose, wherein the size of the copper nose is matched with that of the strain clamp;
3) installing a flexible cable support frame, guiding the flexible cable to the vicinity of the cross arm from the ground, and keeping a safe distance;
4) when power is cut off for a short time, removing the drainage wire of the first strain tower and connecting the drainage wire with a joint at one end of the flexible cable;
5) the drainage wire of the second strain tower is disconnected and connected with the other end of the flexible cable, so that the flexible cable can continuously supply power;
6) and after the newly-built line is lapped, removing the flexible cable, hanging the drainage wire, continuously supplying power to the load from the original overhead line, and recovering the flexible cable by using the cable tray for subsequent continuous use.
Through adopting the flexible cable to carry out the temporary load switching, can effectively realize the repeated recycle many times of temporary load switching cable to the characteristic of flexible cable, it is more simple and convenient to connect and the overhead line operation, effectively promotes the utilization ratio of cable, and reduce cost has avoided traditional load switching cable because can not be crooked wantonly, operates inconveniently, and can not recycle once more the problem of use.
As a preferable technical means: the flexible cable should meet the following requirements: appearance inspection, no obvious scar should be left; insulation resistance measurement, which should not be significantly changed from the previous measurement; dielectric loss tangent, should not be greater than 0.005; partial discharge test, namely applying a rated voltage of 1.73U0, wherein the insulation discharge capacity of the main wire core is not more than 10 pC. Through the conditions, the quality requirement of the flexible cable can be effectively ensured, so that the flexible cable meets the requirement of temporary load transfer.
Has the advantages that: through adopting the flexible cable to carry out the temporary load switching, can effectively realize the repeated recycle many times of temporary load switching cable to the characteristic of flexible cable, it is more simple and convenient to connect and the overhead line operation, effectively promotes the utilization ratio of cable, effective resources are saved, reduce cost has avoided traditional load switching cable because can not crooked wantonly, operates inconveniently, and can not recycle the problem of using once more.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
Fig. 2 is a schematic diagram of the construction of the flexible cable stringing according to the present invention.
In the figure: 1. a flexible cable; 2. a first strain tower; 3. a second strain tower; 4. a drainage wire; 5. and (5) newly building a circuit.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
As shown in fig. 1-2, a method for transferring load of a flexible cable between adjacent tension towers includes the following steps:
s1, selecting a flexible cable 1 which can be repeatedly applied, wherein the length of the flexible cable 1 is greater than the sum of the length of a strain section and the heights of two strain towers;
s2, manufacturing a cable terminal, and crimping a copper nose, wherein the size of the copper nose is matched with that of the strain clamp;
s3, installing a support frame of the flexible cable 1, guiding the flexible cable 1 to the position near the cross arm from the ground, and keeping a safe distance;
s4, power is cut off for a short time, and the drainage wire 4 of the first strain tower 2 is removed and connected with a joint at one end of the flexible cable 1;
s5, detaching the drainage wire 4 of the second strain tower 3, and connecting the drainage wire with the other end of the flexible cable 1 to realize continuous power supply by the flexible cable 1;
and S6, after the newly-built line 5 is lapped, removing the flexible cable 1, hanging the drainage wire 4, continuously supplying power to the load from the original overhead line, and recovering the flexible cable 1 by using a cable tray for subsequent continuous use.
In order to ensure the quality requirements of the flexible cable 1, the flexible cable 1 should meet the following requirements: appearance inspection, no obvious scar should be left; insulation resistance measurement, which should not be significantly changed from the previous measurement; dielectric loss tangent, should not be greater than 0.005; partial discharge test, namely applying a rated voltage of 1.73U0, wherein the insulation discharge capacity of the main wire core is not more than 10 pC. Through these conditions, can effectively guarantee the quality requirement of flexible cable 1, make it accord with the requirement of interim load switching.
Through adopting flexible cable 1 to carry out the switching of temporary load, can effectively realize the repeated recycle many times of temporary load switching cable to flexible cable 1's characteristic, it is more simple and convenient to connect and stringing operation, effectively promotes the utilization ratio of cable, and reduce cost has avoided traditional load switching cable because can not crooked wantonly, operates inconveniently, and can not recycle once more the problem of use.
The method for transferring the load of the flexible cable between the adjacent tension towers shown in fig. 1-2 is a specific embodiment of the present invention, has shown the outstanding substantive features and significant progress of the present invention, and can make equivalent modifications in shape, structure and the like according to the practical use requirements and under the teaching of the present invention, all of which are within the protection scope of the present scheme.
Claims (2)
1. A load transfer method of a flexible cable between adjacent tension towers is characterized by comprising the following steps:
1) selecting a flexible cable (1) which can be repeatedly applied, wherein the length of the flexible cable is greater than the sum of the length of the tension resistant section and the heights of the two tension resistant towers;
2) manufacturing a cable terminal, and crimping a copper nose, wherein the size of the copper nose is matched with that of the strain clamp;
3) installing a support frame of the flexible cable (1), leading the flexible cable (1) to the vicinity of the cross arm from the ground, and keeping a safe distance;
4) when power is cut off for a short time, the drainage wire (4) of the first strain tower (2) is removed and is connected with a joint at one end of the flexible cable (1);
5) the drainage wire (4) of the second strain tower (3) is disconnected and connected with the other end of the flexible cable (1), so that the flexible cable (1) can continuously supply power;
6) after the newly-built line (5) is lapped, the flexible cable (1) is removed, the drainage wire (4) is hung, the load is continuously supplied with power by the original overhead line, and the flexible cable (1) is recovered by the cable tray and can be continuously used subsequently.
2. The method for transferring the load of the flexible cable between the adjacent tension towers according to claim 1, wherein the method comprises the following steps: the flexible cable (1) should meet the following requirements: appearance inspection, no obvious scar should be left; insulation resistance measurement, which should not be significantly changed from the previous measurement; dielectric loss tangent, should not be greater than 0.005; partial discharge test, namely applying a rated voltage of 1.73U0, wherein the insulation discharge capacity of the main wire core is not more than 10 pC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111405303.8A CN114301003A (en) | 2021-11-24 | 2021-11-24 | Load switching method for flexible cable between adjacent strain towers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111405303.8A CN114301003A (en) | 2021-11-24 | 2021-11-24 | Load switching method for flexible cable between adjacent strain towers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114301003A true CN114301003A (en) | 2022-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111405303.8A Pending CN114301003A (en) | 2021-11-24 | 2021-11-24 | Load switching method for flexible cable between adjacent strain towers |
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| Country | Link |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040074749A (en) * | 2003-02-18 | 2004-08-26 | 우창전력(주) | Uninterruptable distributing method of single-phase wire using temporary line |
| CN201789232U (en) * | 2010-08-30 | 2011-04-06 | 河南省电力公司郑州供电公司 | Device for handling failure of overhead line without power cut |
| CN203734209U (en) * | 2014-02-17 | 2014-07-23 | 广东电网公司佛山供电局 | Live working device for cable bypass |
| CN106451220A (en) * | 2016-12-01 | 2017-02-22 | 华北电力科学研究院有限责任公司 | Bypass equipment and method for live replacement of equipment on same-tower multi-loop pole tower |
| CN108963875A (en) * | 2018-07-19 | 2018-12-07 | 吉林师范大学 | The method of on-load migration 10KV overhead transmission line |
-
2021
- 2021-11-24 CN CN202111405303.8A patent/CN114301003A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040074749A (en) * | 2003-02-18 | 2004-08-26 | 우창전력(주) | Uninterruptable distributing method of single-phase wire using temporary line |
| CN201789232U (en) * | 2010-08-30 | 2011-04-06 | 河南省电力公司郑州供电公司 | Device for handling failure of overhead line without power cut |
| CN203734209U (en) * | 2014-02-17 | 2014-07-23 | 广东电网公司佛山供电局 | Live working device for cable bypass |
| CN106451220A (en) * | 2016-12-01 | 2017-02-22 | 华北电力科学研究院有限责任公司 | Bypass equipment and method for live replacement of equipment on same-tower multi-loop pole tower |
| CN108963875A (en) * | 2018-07-19 | 2018-12-07 | 吉林师范大学 | The method of on-load migration 10KV overhead transmission line |
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