CN113193423A - Method and system for improving heat dissipation of cable connector - Google Patents
Method and system for improving heat dissipation of cable connector Download PDFInfo
- Publication number
- CN113193423A CN113193423A CN202110379517.6A CN202110379517A CN113193423A CN 113193423 A CN113193423 A CN 113193423A CN 202110379517 A CN202110379517 A CN 202110379517A CN 113193423 A CN113193423 A CN 113193423A
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- 230000017525 heat dissipation Effects 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000004891 communication Methods 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims 2
- 239000004020 conductor Substances 0.000 abstract description 22
- 230000000694 effects Effects 0.000 description 15
- 230000020169 heat generation Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000012546 transfer Methods 0.000 description 6
- 238000007664 blowing Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/533—Bases, cases made for use in extreme conditions, e.g. high temperature, radiation, vibration, corrosive environment, pressure
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses a method and a system for improving heat dissipation of a cable joint. The system comprises: the cable comprises a cable joint, a cable body and heat dissipation equipment, wherein the cable body is adjacent to at least one end of the cable joint; the heat dissipation device is capable of outputting wind power having a set wind speed and causing the wind power to act on a surface of the cable body for increasing axial heat flow between the cable joint and the cable body. According to the invention, the wind power output by the heat dissipation equipment directly acts on the surface of the cable body adjacent to the cable joint, so that the heat dissipation environment of the surface of the cable body can be improved, the heat dissipation of the cable body is enhanced, the conductor temperature of the cable body is further reduced, the axial heat flow between the cable joint and the cable body is increased, and the purpose of improving the heat dissipation efficiency of the cable joint is finally achieved.
Description
Technical Field
The invention relates to the technical field of cable connectors, in particular to a method and a system for improving heat dissipation of a cable connector.
Background
As the demand for power increases, the load on the line also increases. Under the same ambient environment, the cable joint has poor heat dissipation effect due to large volume, and becomes a hot spot position in the line and a weak point in the line. The overheating operation can not only accelerate the aging of the main insulation of the cable joint and shorten the service life of the cable joint, but also increase the breakdown fault probability of the cable joint and threaten the safe and stable operation of a line. When the cable joint is overheated seriously, accidents such as fire explosion and the like can be caused, and irreversible loss is caused.
Meanwhile, the temperature is a key factor for limiting the increase of the current-carrying capacity of the cable line. Compared with a cable body, the temperature of the cable joint is higher, and the bottleneck point for limiting the increase of the current-carrying capacity is formed. The related measures are provided to reduce the conductor temperature of the cable joint, which is of great significance to the improvement of the current-carrying capacity of the line.
The heat dissipation improvement of the cable joint mainly has the following three aspects:
the first aspect is achieved by reducing the additional heat generation inside the cable joint, for example from the installation process, by reducing the contact resistance of the crimp tube to reduce the additional heat generation of the crimp tube. But under the condition that the heat generated in the cable joint is the same, the heat dissipation effect of the cable joint can be further improved by improving the external conditions.
The second aspect is achieved by improving the radial heat dissipation of the cable joint, such as improving the laying environment to improve the heat dissipation of the cable, or replacing the internal filling material of the cable joint with a high thermal conductive filling material. However, the cable joint has thick insulation and large volume, and the improvement of the radial heat dissipation of the cable joint has poor heat dissipation effect.
The third aspect is realized by blowing cold air to the cable joint, and the scheme exchanges heat away through the cold air acting environment. This scheme is equivalent to "changing" an environment for cable joint, but because cable joint's is bulky, insulating thick, its surface temperature is less with the ambient temperature difference, improves the ambient temperature around and is not good to promoting its inside radiating effect, and this kind of method cost is higher (structural design cost and use cost are all high), and the economic benefits who brings is little.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a method and a system for improving the heat dissipation of a cable joint, which can realize better heat dissipation effect and lower the cost.
In a first aspect of the present invention, a method for improving heat dissipation of a cable joint is provided, which includes the following steps:
the wind power with the set wind speed is output by the heat dissipation equipment to act on the surface of the cable body adjacent to at least one end of the cable joint, so that the heat dissipation of the cable body is enhanced, and the axial heat flow between the cable joint and the cable body is further increased.
According to the embodiment of the invention, at least the following technical effects are achieved:
wind power through the heat dissipation equipment output directly acts on the surface of the cable body adjacent to the cable joint, can improve the heat dissipation environment on the surface of the cable body, realizes the heat dissipation of the enhanced cable body, further realizes the conductor temperature reduction of the cable body, realizes the axial heat flow between the increased cable joint and the cable body, and finally achieves the purpose of improving the heat dissipation efficiency of the cable joint.
Compared with the implementation method for reducing the additional heat generation inside the cable joint, the method can further improve the heat dissipation of the cable joint on the basis of the implementation method, and further improve the current-carrying capacity of the line.
Compared with the implementation method for improving the radial heat dissipation of the cable joint, the method improves the heat dissipation environment of the cable body through the auxiliary heat dissipation equipment, so that the axial heat flow between the cable joint and the adjacent body is increased, the implemented heat dissipation effect is better, and the utilized cost is lower.
Compared with the existing implementation scheme of blowing cold air to the cable joint, the method starts from different heat dissipation principles of the cable joint, improves the heat dissipation environment of the cable body through the auxiliary heat dissipation equipment, and accordingly increases axial heat flow between the cable joint and the adjacent body instead of acting on the cable joint, and the heat dissipation effect achieved by the method is better.
In a second aspect of the present invention, a system for improving heat dissipation of a cable joint is provided, including:
a cable joint;
a cable body adjacent at least one end of the cable joint;
a heat sink device capable of outputting wind power having a set wind speed and acting the wind power on a surface of the cable body for increasing axial heat flow between the cable joint and the cable body.
According to the embodiment of the invention, at least the following technical effects are achieved:
wind power through the heat dissipation equipment output directly acts on the surface of the cable body adjacent to the cable joint, can improve the heat dissipation environment on the surface of the cable body, realizes the heat dissipation of the enhanced cable body, further realizes the conductor temperature reduction of the cable body, realizes the axial heat flow between the increased cable joint and the cable body, and finally achieves the purpose of improving the heat dissipation efficiency of the cable joint.
Compared with the implementation method for reducing the additional heat generation inside the cable joint, the system can further improve the heat dissipation of the cable joint on the basis of the implementation method, and further improves the current-carrying capacity of the line. .
Compared with the implementation method for improving the radial heat dissipation of the cable joint, the system improves the heat dissipation environment of the cable body through the auxiliary heat dissipation equipment, so that the axial heat flow between the cable joint and the adjacent body is increased, the implemented heat dissipation effect is better, and the utilized cost is lower.
Compare in current through blowing the implementation scheme who jets cold wind to cable joint, this system improves the radiating environment of cable body through supplementary radiating equipment from cable joint's different heat dissipation principles to increase axial heat flow between cable joint and adjacent body, rather than acting on cable joint, the radiating effect that this system realized is better.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flow chart illustrating a method for improving heat dissipation of a cable joint according to an embodiment of the present invention;
FIG. 2 is a front view of the fan, the cable connector and the cable body according to the embodiment of the present invention;
FIG. 3 is a top view of the fan, the cable connector and the cable body according to the embodiment of the present invention;
FIG. 4 is a left side view of the fan and the cable connector and cable body according to the embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the distribution of wind speed and conductor temperature according to an embodiment of the present invention;
description of reference numerals:
1. a fan; 2. a cable joint; 3. a cable body.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A first embodiment;
referring to fig. 1, there is provided a method of improving heat dissipation of a cable joint, comprising the steps of:
s100, outputting wind power with set wind speed through heat dissipation equipment, and enabling the wind power to act on the surface of the cable body adjacent to at least one end of the cable joint so as to increase axial heat flow between the cable joint and the cable body.
Wind power output by the heat dissipation device directly acts on the surface of the cable body adjacent to the cable joint (except for special statement, the adjacent is equal to contact), the heat dissipation environment of the surface of the cable body can be improved, the heat dissipation of the cable body is enhanced, the temperature of a conductor of the cable body is further reduced, the axial heat flow between the cable joint and the cable body is increased, and the purpose of improving the heat dissipation efficiency of the cable joint is finally achieved.
The principle on which the method is based is as follows:
heat generated by the cable joint is dissipated to the surrounding environment along the radial direction and the axial direction, wherein the heat dissipated along the radial direction penetrates through each layer structure of the cable joint and is finally dissipated to the environment; the heat dissipated in the axial direction is conducted from the side with a high temperature to the side with a low temperature by a good conductor of heat, such as a cable conductor. As can be seen from the thermal path theory, the heat flow is proportional to the temperature difference, so that the wind output by the heat dissipation device acts on the surface of the cable body, and the axial heat flow between the cable joint and the conductor of the cable body (except for special statement, the body is referred to as short for the cable body) is increased due to the increase of the temperature difference between the two, so that more heat inside the cable joint is conducted and dissipated along the conductor from the axial direction. Because the structure of the cable joint is complex, the heat exchange mode of the surface of the cable joint and the surrounding environment is almost unchanged, and the part of the heat inside the cable joint conducting in the radial direction is almost consistent with the original mode. The total amount of heat emitted is equal to the sum of the amount of heat emitted in the radial direction and the amount of heat emitted in the axial direction, and based on the above-described increase in the amount of heat emitted in the axial direction, the amount of heat emitted in the radial direction is almost constant, and therefore the total amount of heat emitted is increased. According to the law of conservation of energy, the heat generation amount is equal to the sum of the heat dissipation amount and the internal energy of the component, and the internal energy of the component refers to the energy consumed for maintaining the temperature of the conductor of the cable joint.
The method has the advantages that:
compared with the implementation method of reducing the additional heat generation inside the cable joint (for example, reducing the contact resistance of the crimping pipe), the method can further improve the heat dissipation of the cable joint and further improve the current-carrying capacity of the line.
Compared with a method for improving radial heat dissipation of the cable joint (for example, replacing the internal filling material of the cable joint with a high-heat-conductivity filling material), the method improves the heat dissipation environment of the cable body through the auxiliary heat dissipation equipment, so that axial heat flow between the cable joint and the adjacent body is increased, the heat dissipation effect is better, and the cost is lower.
Compared with the existing implementation scheme of blowing cold air to the cable joint, the method starts from different heat dissipation principles of the cable joint, improves the heat dissipation environment of the cable body through the auxiliary heat dissipation equipment, and accordingly increases axial heat flow between the cable joint and the adjacent body instead of acting on the cable joint, and the heat dissipation effect achieved by the method is better.
The following describes the specific implementation of step S100 in detail:
as an alternative embodiment, the heat dissipation device is preferably a fan, and the heat dissipation device may also be an air conditioner capable of blowing cold air at a set air speed, but the overall cost of the fan is lower.
Firstly, a fan is added near a cable body adjacent to a cable joint, the fan is arranged on one side of the cable body, and the wind direction is vertical to the cable laying direction.
As shown in fig. 2 to 4, it should be noted that, as an example, only 2 fans are shown in fig. 2, the number of the fans and the distance from the cable body may be set according to actual situations, for example, when the types of the cable connectors are different, or when the environments in the cable tunnels where the cable connectors are located are different, the number of the fans and the distance from the cable body are determined according to actual situations. In addition, it should be noted that, the fan may be added only near the cable body adjacent to one end of the cable connector, but because of the symmetry of the cable body, the heat dissipation is greatly improved and the size of the fan may be set according to circumstances as compared with the case where the fan is added only near the cable body adjacent to one end of the cable connector and the fan is added near the cable body adjacent to both ends of the cable connector.
And secondly, starting the fan to improve the heat dissipation environment of the surface of the cable body under the action of the fan.
Compared with the fan which is not started, after the fan is started, the heat dissipation of the cable body is enhanced, the temperature of the conductor is reduced, and the difference value between the conductor temperature of the cable joint and the conductor temperature of the cable body is increased.
The increased temperature differential between the conductors of the cable joint and the body increases the axial heat flow therebetween, and more of the heat within the cable joint will be conducted axially along the conductors.
The heat exchange mode of the surface of the cable joint and the surrounding environment is almost unchanged, so that the part of the heat inside the cable joint conducting in the radial direction is almost consistent with the original mode.
The total amount of heat emitted is equal to the sum of the amount of heat emitted in the radial direction and the amount of heat emitted in the axial direction, and based on the above-described increase in the amount of heat emitted in the axial direction, the amount of heat emitted in the radial direction is almost constant, and therefore the total amount of heat emitted is increased.
According to the law of conservation of energy, the heat production is equal to the sum of the heat dissipation capacity and the internal energy of the component. Internal energy in a component refers to the energy consumed to maintain the temperature of the cable joint conductor. Therefore, under the same heat generation amount, the increase of the heat dissipation amount leads to the decrease of the internal energy of the component, and the temperature of the cable joint conductor is reduced.
As an alternative, the wind speed set in step S100 may be adjusted. Preferably, the heat dissipation device establishes a communication connection with a mobile terminal, so that the mobile terminal controls the heat dissipation device to adjust the set wind speed. Due to the fact that the environment in the cable tunnel is complex, the purpose of the design is to facilitate the remote opening and closing operation of the heat dissipation device and the remote control of the air speed blown out by the heat dissipation device for the convenience of management personnel.
A second embodiment;
to facilitate understanding of the inventive concept by those skilled in the art, the cross-section is 630mm at 110kV2The cable body and the straight-through cable joint adapted to the cable body are taken as examples, and simulation shows that the temperature of the cable joint is improved after a fan is added.
When the fan is not started, the heat exchange modes of the cable joint and the body and the surface are mainly natural convection heat exchange; when the fan is started, the heat dissipation mode of the body part adjacent to the cable joint is changed from natural convection heat transfer to forced convection heat transfer. The main action object of the fan is the cable body, so that the influence of the fan on the surface of the cable connector is small, and the heat exchange mode of the cable connector and the environment is still mainly natural convection heat exchange.
The convective heat transfer coefficient h is calculated as follows:
wherein N isuExpressing the nussel number, lambda the thermal conductivity and l the characteristic length. The Nussel number is the Rayleigh number R shown in the formula (2) during natural convection heat exchangeaAnd calculating to obtain:
wherein g represents the acceleration of gravity, αvDenotes the gas expansion coefficient, Δ t denotes the difference between the surface temperature and the ambient temperature, and α denotes the thermal diffusivity.
In the forced convection heat transfer, the Knudsen number is calculated by the Reynolds number shown in the formula (4):
Nu＝CRenPr1/3 (4)
wherein v issRepresenting the velocity, v represents the kinematic viscosity.
And obtaining the convective heat transfer coefficients of the cable joint and the body based on the algorithm of the convective heat transfer coefficients. The conductor temperature distribution of the cable joint and the conductor temperature distribution of the body are obtained through simulation under different wind speeds, as shown in fig. 5, when the wind speed is higher, the heat dissipation efficiency is better, and when the wind speed reaches a set threshold value, the heat dissipation efficiency is not obviously improved; the closer the fan is to the cable body, the better the effect. Therefore, the effect of obviously reducing and improving the conductor temperature of the cable joint is achieved by adding the fan.
A third embodiment;
the embodiment provides a system for improving heat dissipation of a cable joint, which comprises: the cable comprises a cable joint, a cable body and heat dissipation equipment, wherein the cable body is adjacent to at least one end of the cable joint; the heat dissipation device is capable of outputting wind power having a set wind speed and causing the wind power to act on a surface of the cable body for increasing axial heat flow between the cable joint and the cable body.
Wind power through the heat dissipation equipment output directly acts on the surface of the cable body adjacent to the cable joint, can improve the heat dissipation environment on the surface of the cable body, realizes the heat dissipation of the enhanced cable body, further realizes the conductor temperature reduction of the cable body, realizes the axial heat flow between the increased cable joint and the cable body, and finally achieves the purpose of improving the heat dissipation efficiency of the cable joint.
It should be noted that, since the present embodiment is the same inventive concept as the first embodiment, the principle part may refer to the first embodiment, and details are not described herein.
As an alternative embodiment, the heat dissipation device is a fan, the fan is disposed at one side of the cable body, and the wind output from the output end of the fan is directed to the surface of the cable body. The cost of the fan is low and it is easy to place in the cable tunnel.
As an optional implementation manner, the wind power generation system further comprises a mobile terminal, wherein the mobile terminal is in communication connection with the fan and is used for controlling and adjusting the output wind speed of the output end of the fan. The purpose of this design is in order to make things convenient for the managers to realize the remote control to the remote operation of opening and closing of heat dissipation equipment and to the wind speed that the heat dissipation equipment blew off.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A method for improving heat dissipation of a cable joint is characterized by comprising the following steps:
wind power with set wind speed is output through the heat dissipation equipment and acts on the surface of the cable body adjacent to at least one end of the cable joint, and the surface is used for increasing axial heat flow between the cable joint and the cable body.
2. The method of improving the heat dissipation of a cable joint according to claim 1, wherein the wind force acts on a surface of the cable body adjacent to both ends of the cable joint.
3. The method of claim 2, wherein the heat dissipation device is a fan, and wherein the wind output from the fan is directed at a surface of the cable body adjacent to both ends of the cable joint.
4. The method of claim 3, wherein the fan is disposed on a side of the cable body adjacent to both ends of the cable connector.
5. The method for improving heat dissipation in a cable joint of claim 1, wherein the wind force is applied to the cable body from the head end of the cable body to a length along the axial direction, the head end of the cable body being the end adjacent to the cable joint.
6. The method of claim 1, wherein the set wind speed is adjustable.
7. The method for improving heat dissipation of a cable joint according to claim 5, wherein the heat dissipation device is communicatively connected to a mobile terminal, so that the mobile terminal controls the heat dissipation device to adjust the set wind speed.
8. A system for enhancing heat dissipation in a cable joint, comprising:
a cable joint;
a cable body adjacent at least one end of the cable joint;
a heat sink device capable of outputting wind power having a set wind speed and acting the wind power on a surface of the cable body for increasing axial heat flow between the cable joint and the cable body.
9. The system for improving heat dissipation of a cable joint as recited in claim 8, wherein the heat dissipation device is a fan disposed on a side of the cable body, and the wind output from the fan is directed toward a surface of the cable body.
10. The system for enhancing heat dissipation in a cable joint of claim 9, further comprising a mobile terminal; and the mobile terminal is in communication connection with the fan and is used for controlling and adjusting the output wind speed of the output end of the fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110379517.6A CN113193423B (en) | 2021-04-08 | 2021-04-08 | Method and system for improving heat dissipation of cable joint |
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|---|---|---|---|
| CN202110379517.6A CN113193423B (en) | 2021-04-08 | 2021-04-08 | Method and system for improving heat dissipation of cable joint |
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| CN113193423A true CN113193423A (en) | 2021-07-30 |
| CN113193423B CN113193423B (en) | 2024-02-02 |
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| CN111525334A (en) * | 2020-05-08 | 2020-08-11 | 安徽金蓝焰线缆有限公司 | Heat dissipation locking cable joint that takes off |
| CN211699815U (en) * | 2019-12-23 | 2020-10-16 | 南通市鹏程电缆有限公司 | Radiating wire and cable |
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2021
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|---|---|---|---|---|
| JP2004281181A (en) * | 2003-03-14 | 2004-10-07 | Hitachi Kokusai Electric Inc | Heat radiation structure |
| JP2007048741A (en) * | 2005-07-14 | 2007-02-22 | Auto Network Gijutsu Kenkyusho:Kk | Conductor and heat radiating structure of conductor |
| CN203177377U (en) * | 2013-03-29 | 2013-09-04 | 国家电网公司 | Environmental treatment device for cable joint |
| CN205355771U (en) * | 2016-01-06 | 2016-06-29 | 广东水利电力职业技术学院 | Can improve cable distribution box rain -proof and heat dispersion |
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| CN107819316A (en) * | 2017-12-18 | 2018-03-20 | 余金铭 | A kind of intelligent cable feeder pillar |
| CN209342244U (en) * | 2018-11-27 | 2019-09-03 | 西安辰瑞建设工程有限公司 | A kind of cable intermediate joint temperature controlling alarm |
| CN209981969U (en) * | 2019-08-01 | 2020-01-21 | 成都龙瀛电力电子实业有限公司 | American high tension cable distribution box convenient to maintain |
| CN210867155U (en) * | 2019-11-01 | 2020-06-26 | 江苏华林电力科技有限公司 | Outdoor high tension cable feeder pillar of insulating formula with dustproof mechanism |
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| CN111525334A (en) * | 2020-05-08 | 2020-08-11 | 安徽金蓝焰线缆有限公司 | Heat dissipation locking cable joint that takes off |
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| Publication number | Publication date |
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| CN113193423B (en) | 2024-02-02 |
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