CN113708309A - Delta-shaped excitation alternating-current power cable support - Google Patents
Delta-shaped excitation alternating-current power cable support Download PDFInfo
- Publication number
- CN113708309A CN113708309A CN202110954225.0A CN202110954225A CN113708309A CN 113708309 A CN113708309 A CN 113708309A CN 202110954225 A CN202110954225 A CN 202110954225A CN 113708309 A CN113708309 A CN 113708309A
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- Prior art keywords
- plate
- connecting plate
- delta
- cable
- power cable
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Links
- 230000005284 excitation Effects 0.000 title claims abstract description 27
- 230000007704 transition Effects 0.000 claims description 10
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 8
- 239000004812 Fluorinated ethylene propylene Substances 0.000 description 2
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 229920009441 perflouroethylene propylene Polymers 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
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- 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
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0456—Ladders or other supports
-
- 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
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0406—Details thereof
-
- 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
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/30—Installations of cables or lines on walls, floors or ceilings
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a delta-shaped excitation alternating-current power cable support, which mainly solves the problems that the existing cable support is difficult to package and transport, inconvenient to mount and erect and easy to generate electromagnetic circulation. The cable support comprises an adjustable support, an insulating bridge and a cable through hole; the adjustable support comprises a fixed plate, a vertical connecting plate, a height adjusting plate, a horizontal connecting plate and a diagonal draw plate, wherein the fixed plate is used for being fixed on a wall body, the vertical connecting plate is arranged on the fixed plate, the height adjusting plate is connected with the vertical connecting plate, the horizontal connecting plate is fixedly connected with one end of the height adjusting plate, the horizontal distance adjusting plate is connected with the horizontal connecting plate, and the diagonal draw plate is connected with the height adjusting plate at one end and the other end of the diagonal draw plate is connected with the other end of the horizontal connecting plate. The three-phase cable is arranged in a delta shape, and the vector sum of three-phase currents in space is zero, so that the electromagnetic circulation of the space is also zero, and equipment damage accidents caused by cable heating caused by the electromagnetic circulation of the space are reduced. Meanwhile, the whole support is convenient to package, transport, install and use.
Description
Technical Field
The invention relates to a cable support, in particular to a delta-shaped excitation alternating-current power cable support.
Background
When the exciting power cables of multiple units of the hydropower station pass through a cable bridge at the top of an upstream auxiliary workshop of the middle layer, the cable laying path is bent, so that the exciting alternating-current and direct-current power cables are too long, and the voltage drop is increased; alternating current and direct current hybrid and overlapped laying of the excitation alternating current and direct current power cables exist in the cable bridge, and the excitation alternating current and direct current power cables are blocked by adopting a fireproof bag at intervals on the cable bridge, so that the excitation alternating current and direct current power cables are poor in heat dissipation and high in temperature. Therefore, the ac excitation magnetic power cable and the dc power cable are normally required to be arranged in different regions by the cable support, and the positive electrode and the negative electrode of the dc power cable are arranged in a layered manner.
However, the existing cable support still has the problems of difficult packaging and transportation and inconvenient installation and erection, and meanwhile, for a three-phase excitation alternating current cable, the alternating current excitation cable provides large-capacity excitation current for a generator set during normal operation, but electromagnetic circulation can be formed at the same time, and the cable heating causes equipment damage and accidents. Accordingly, there is a need for improvements to existing cable holders.
Disclosure of Invention
The invention aims to provide a delta-shaped excitation alternating-current power cable support, which mainly solves the problems that the existing cable support is difficult to package and transport, inconvenient to mount and erect and easy to generate electromagnetic circulation.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a delta-shaped excitation alternating-current power cable support comprises a pair of adjustable supports, an insulating bridge fixedly mounted on the two adjustable supports, and a plurality of groups of delta-shaped cable through holes formed in the insulating bridge; the adjustable support comprises a fixed plate, a vertical connecting plate, a height adjusting plate, a horizontal connecting plate, a horizontal distance adjusting plate and a diagonal drawing plate, wherein the fixed plate is used for being fixed on a wall body; wherein, the two ends of the insulating bridge frame are respectively fixed on the horizontal distance adjusting plates of the two adjustable brackets.
Further, in the invention, the height adjusting plate and the horizontal spacing adjusting plate have the same structure and are both composed of a transition plate and a connecting plate vertically connected with the transition plate; the transition plate of the height adjusting plate is connected with the horizontal connecting plate; all be provided with first waist type groove and first fixed orifices on the connecting plate.
Further, in the invention, the fixing plate and the horizontal spacing adjusting plate are both provided with a second waist-shaped groove and a second fixing hole; the first waist-shaped groove is connected with the second fixing hole through a screw, and the second waist-shaped groove is connected with the first fixing hole through a screw.
Further, in the present invention, the diagonal draw plate is constituted by links foldably connected.
Further, in the present invention, a soft ring made of neoprene is provided on an inner wall of the cable through-hole.
Further, in the present invention, the inner wall of the soft ring is provided with a convex strip.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the actual operation condition of the power cable of the excitation system of the hydropower station is combined, the AC excitation power cable and the DC power cable are arranged in different regions according to the laying and operation conditions of the power cable of the excitation system, the anode and the cathode of the DC power cable are arranged in layers, and the triangular bracket made of epoxy insulation materials is creatively used for standardizing the laying of the excitation AC power cable, so that the excitation AC power cable realizes the space triangular shape, and the heat dissipation and ventilation effects in the operation of the excitation cable are improved.
(2) The adjustable supports are all connected in a foldable mode, are of regular structures after being disassembled, are convenient to store and package, can realize height adjustment of the insulating bridge frame by adjusting the position between the first waist-shaped groove and the second waist-shaped groove, and are convenient to use as the horizontal distance adjusting plate is suitable for installation of insulating bridge frames with different lengths.
Drawings
Fig. 1 is a schematic front structural view of the present invention.
Fig. 2 is a schematic structural view of a cable through hole according to the present invention.
Fig. 3 is a schematic structural view of the vertical connecting plate of the present invention.
Fig. 4 is a schematic structural view of the height adjustment plate of the present invention.
Wherein, the names corresponding to the reference numbers are:
1-adjustable support, 2-insulating bridge, 3-cable through hole, 4-fixing plate, 5-vertical connecting plate, 6-height adjusting plate, 7-horizontal connecting plate, 8-horizontal spacing adjusting plate, 9-inclined pulling plate, 10-transition plate, 11-connecting plate, 12-first waist-shaped groove, 13-first fixing hole, 14-second waist-shaped groove, 15-second fixing hole, 16-connecting rod, 17-soft ring and 18-convex strip.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
Examples
As shown in fig. 1 to 4, the delta-shaped excitation ac power cable bracket disclosed by the invention comprises a pair of adjustable brackets 1, an insulating bridge frame 2 fixedly installed on the two adjustable brackets 1, and a plurality of groups of delta-shaped cable through holes 3 arranged on the insulating bridge frame 2; the adjustable support 1 comprises a fixing plate 4 fixed on a wall body, a vertical connecting plate 5 arranged on the fixing plate 4, a height adjusting plate 6 connected with the vertical connecting plate 5, a horizontal connecting plate 7 fixedly connected with one end of the height adjusting plate 6, a horizontal distance adjusting plate 8 connected with the horizontal connecting plate 7, and a diagonal draw plate 9, one end of which is connected with the height adjusting plate 6 and the other end of which is connected with the other end of the horizontal connecting plate 7; wherein, two ends of the insulating bridge frame 2 are respectively fixed on the horizontal distance adjusting plates 8 of the two adjustable brackets.
In order to facilitate the storage of the diagonal draw plate, the diagonal draw plate 9 is formed by a connecting rod 16 which is foldably connected.
In the present invention, a soft ring 17 made of neoprene is provided on the inner wall of the cable through-hole 3. And the inner wall of the soft ring 17 is provided with a convex strip 18. The soft ring can prevent the outer skin of the cable from being damaged by friction generated when the cable passes through the insulating bridge. The raised strips 18 can increase the friction between the cable and the cable through hole 3 after the cable is erected, so that the cable is more stable after being erected.
In the invention, the height adjusting plate 6 and the horizontal connecting plate 7 have the same structure and are both composed of a transition plate 10 and a connecting plate 11 vertically connected with the transition plate; the transition plate of the height adjusting plate 6 is connected with the transition plate of the horizontal connecting plate 7; the connecting plates 11 are provided with first waist-shaped grooves 12 and first fixing holes 13. Moreover, the fixing plate 4 and the horizontal spacing adjusting plate 8 are both provided with a second waist-shaped groove 14 and a second fixing hole 15; the first waist-shaped groove 12 is connected with the second fixing hole 15 through a screw, and the second waist-shaped groove 14 is connected with the first fixing hole 13 through a screw. During specific installation, the connection positions between the first waist-shaped groove 12 and the second fixing hole 15 and between the second waist-shaped groove 14 and the first fixing hole 13 are adjusted according to the length and the installation height of the insulating bridge, and the installation and the use are very convenient.
Specifically, taking a seedling tail hydropower station excitation system as an example, the types are as follows: the rated exciting current is 2425A, and the number of the exciting cables is selected according to 1.1 times of the rated exciting current in normal operation. (the cross-sectional area of the single-core cable is 185mm according to the engineering experience)
IeN＝1.1×IfN＝1.1×2425A＝2667.5A
185mm for the selected cross-section2The single-core fluorinated ethylene propylene insulating silicon rubber sheathed copper-core power cable has the allowable carrying capacity of 438A-564A and the cable laying coefficient of 0.7-0.8 (the situation that a plurality of cables are connected in parallel in each phase is estimated).
2178 ÷ 0.7 ÷ 438 ═ 7.1 (8 taken) roots
Therefore, when each phase adopts 8 or more, the current-carrying capacity meets the requirement, in order to ensure that the cables can run for a long time under the rated current, properly reduce the actual current-carrying capacity of each cable and reduce the heat productivity of the cables, 10 cables are adopted for each phase of the alternating current cables to be used in parallel, and the total number of the alternating current cables of each unit is 30.
DC cable
IeN＝1.1×IfN＝1.1×2425A＝2667.5A
185mm for the selected cross-section2The single-core fluorinated ethylene propylene insulating silicon rubber sheathed copper-core power cable has the allowable carrying capacity of 438A-564A and the cable laying coefficient of 0.7-0.8 (a plurality of cables are estimated to be connected in parallel for each pole).
2667.5 ÷ 0.7 ÷ 438 ═ 8.7 (9 taken) roots
Therefore, when each pole adopts 9 or more cables, the current-carrying capacity meets the requirement, and in order to ensure that the cables can run for a long time under rated current, properly reduce the actual current-carrying capacity of each cable and reduce the heat productivity of the cables, each pole of the direct current cable is recommended to adopt 11 cables for parallel use. The total number of the direct current cables of each unit is 33.
According to the calculation result, 10 AC excitation cables are arranged in each phase, and the size of the bracket is designed by considering the installation position and the size of the existing bridge (the width of the bridge is 600mm, the height is 100mm, and the width of the cross arm is 30 mm): 600mm long, 75mm high, 28mm wide, circular arc diameter 25mm, four groups of cables (A, B, C triphase) can be arranged to each support.
The principle of the arrangement of the alternating-current insulated cable supports is to ensure that an alternating-current A, B, C three-phase magnetic field is balanced, the current distribution of each alternating-current cable is basically in a balanced state, the length of a horizontal section of a bridge is 13.5 meters, the distance between cross arms of the bridge is 30cm, if 90 sets of the supports required by the arrangement of the insulated supports are arranged according to each cross arm, multiple experiments are carried out on site, and the situation that when the installation distance of the insulated supports is larger than 100cm, the cables bend and fall down when the cables are arranged on the supports and are not on the same level, so that the distances between A, B, C three-phase cables are unequal and not on a concentric circle is found, and finally, the installation distance of the supports is adjusted to be 90 cm.
Through the design, the erected three-phase cable is arranged in a delta shape, the vector sum of three-phase currents in space is zero, so that the electromagnetic circulation of the space is also zero, and equipment damage accidents caused by cable heating caused by the electromagnetic circulation of the space are reduced. Meanwhile, the whole support is convenient to package, transport, install and use. Therefore, the method is suitable for popularization and application.
The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or changes made within the spirit and scope of the main design of the present invention, which still solve the technical problems consistent with the present invention, should be included in the scope of the present invention.
Claims (6)
1. A delta-shaped excitation AC power cable support is characterized by comprising a pair of adjustable supports (1), an insulating bridge (2) fixedly arranged on the two adjustable supports (1), and a plurality of groups of delta-shaped cable through holes (3) arranged on the insulating bridge (2); the adjustable support (1) comprises a fixing plate (4) fixed on a wall body, a vertical connecting plate (5) arranged on the fixing plate (4), a height adjusting plate (6) connected with the vertical connecting plate (5), a horizontal connecting plate (7) fixedly connected with one end of the height adjusting plate (6), a horizontal distance adjusting plate (8) connected with the horizontal connecting plate (7), and a cable-stayed plate (9) of which one end is connected with the height adjusting plate (6) and the other end is connected with the other end of the horizontal connecting plate (7); wherein, two ends of the insulating bridge frame (2) are respectively fixed on the horizontal distance adjusting plates (8) of the two adjustable brackets.
2. The delta-shaped excitation alternating-current power cable bracket as claimed in claim 1, wherein the height adjusting plate (6) and the horizontal spacing adjusting plate (8) are identical in structure and are respectively composed of a transition plate (10) and a connecting plate (11) vertically connected with the transition plate; the transition plate of the height adjusting plate (6) is connected with the horizontal connecting plate (7); the connecting plates (11) are provided with first waist-shaped grooves (12) and first fixing holes (13).
3. A delta-shaped excitation ac power cable bracket according to claim 2, wherein the fixing plate (4) and the horizontal distance adjusting plate (8) are provided with a second waist-shaped groove (14) and a second fixing hole (15); the first waist-shaped groove (12) is connected with the second fixing hole (15) through a screw, and the second waist-shaped groove (14) is connected with the first fixing hole (13) through a screw.
4. A delta-shaped excited AC power cable bracket according to claim 3, characterized in that the diagonal draw plates (9) are formed by foldably connected links (16).
5. A delta-shaped excitation AC power cable bracket according to claim 4, characterized in that the inner wall of the cable through hole (3) is provided with a soft ring (17) made of neoprene.
6. A delta-shaped excitation AC power cable bracket according to claim 5, characterized in that the inner wall of the soft ring (17) is provided with raised strips (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110954225.0A CN113708309A (en) | 2021-08-19 | 2021-08-19 | Delta-shaped excitation alternating-current power cable support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110954225.0A CN113708309A (en) | 2021-08-19 | 2021-08-19 | Delta-shaped excitation alternating-current power cable support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113708309A true CN113708309A (en) | 2021-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110954225.0A Pending CN113708309A (en) | 2021-08-19 | 2021-08-19 | Delta-shaped excitation alternating-current power cable support |
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| Country | Link |
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| CN (1) | CN113708309A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202812471U (en) * | 2012-09-19 | 2013-03-20 | 烟台中集来福士海洋工程有限公司 | Adjustable cable bracket |
| CN204633293U (en) * | 2015-06-04 | 2015-09-09 | 贵州电力试验研究院 | The adjustable fastening device that lightning protection needle body is fixing on steel tower |
| CN107482548A (en) * | 2017-08-29 | 2017-12-15 | 四川弘毅智慧知识产权运营有限公司 | A kind of adjustable height ensures the support of stability |
| CN207303887U (en) * | 2017-09-22 | 2018-05-01 | 武汉凯迪电力工程有限公司 | A kind of setting height(from bottom) and the two-way adjustable cable testing bridge stent of width |
| CN210567385U (en) * | 2019-07-24 | 2020-05-19 | 招商局金陵船舶(威海)有限公司 | Adjustable support of marine hoisting equipment |
| CN211209157U (en) * | 2019-12-25 | 2020-08-07 | 新晟通复合材料(淮安)有限公司 | Pre-buried formula cable support convenient to adjust |
| CN211846774U (en) * | 2020-01-10 | 2020-11-03 | 康力电梯股份有限公司 | Wire hanging frame for traveling cable with steel core |
| CN112202124A (en) * | 2020-09-29 | 2021-01-08 | 深圳市泰士特科技股份有限公司 | Cable wall-penetrating protection system |
-
2021
- 2021-08-19 CN CN202110954225.0A patent/CN113708309A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202812471U (en) * | 2012-09-19 | 2013-03-20 | 烟台中集来福士海洋工程有限公司 | Adjustable cable bracket |
| CN204633293U (en) * | 2015-06-04 | 2015-09-09 | 贵州电力试验研究院 | The adjustable fastening device that lightning protection needle body is fixing on steel tower |
| CN107482548A (en) * | 2017-08-29 | 2017-12-15 | 四川弘毅智慧知识产权运营有限公司 | A kind of adjustable height ensures the support of stability |
| CN207303887U (en) * | 2017-09-22 | 2018-05-01 | 武汉凯迪电力工程有限公司 | A kind of setting height(from bottom) and the two-way adjustable cable testing bridge stent of width |
| CN210567385U (en) * | 2019-07-24 | 2020-05-19 | 招商局金陵船舶(威海)有限公司 | Adjustable support of marine hoisting equipment |
| CN211209157U (en) * | 2019-12-25 | 2020-08-07 | 新晟通复合材料(淮安)有限公司 | Pre-buried formula cable support convenient to adjust |
| CN211846774U (en) * | 2020-01-10 | 2020-11-03 | 康力电梯股份有限公司 | Wire hanging frame for traveling cable with steel core |
| CN112202124A (en) * | 2020-09-29 | 2021-01-08 | 深圳市泰士特科技股份有限公司 | Cable wall-penetrating protection system |
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Application publication date: 20211126 |