KR101682504B1 - Cable for electric train - Google Patents

Cable for electric train Download PDF

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Publication number
KR101682504B1
KR101682504B1 KR1020100025327A KR20100025327A KR101682504B1 KR 101682504 B1 KR101682504 B1 KR 101682504B1 KR 1020100025327 A KR1020100025327 A KR 1020100025327A KR 20100025327 A KR20100025327 A KR 20100025327A KR 101682504 B1 KR101682504 B1 KR 101682504B1
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KR
South Korea
Prior art keywords
cable
train
electric
carbon nanotubes
present
Prior art date
Application number
KR1020100025327A
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Korean (ko)
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KR20110106097A (en
Inventor
김정익
김상겸
곽일조
한흥남
Original Assignee
엘에스전선 주식회사
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Priority to KR1020100025327A priority Critical patent/KR101682504B1/en
Priority to US13/049,103 priority patent/US8658902B2/en
Publication of KR20110106097A publication Critical patent/KR20110106097A/en
Application granted granted Critical
Publication of KR101682504B1 publication Critical patent/KR101682504B1/en

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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/13—Energy storage using capacitors

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  • Engineering & Computer Science (AREA)
  • Conductive Materials (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nanotechnology (AREA)
  • Materials Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cable for a train which supplies electric power to a train.
The cable for a train according to the present invention is formed by combining aluminum and carbon nanotubes, and the weight ratio of the carbon nanotubes to aluminum is 0.5 to 3 wt%.
The present invention improves the mechanical strength of a cable for a tram, thereby extending the service life of the cable for the tram and reducing the maintenance cost for the cable for the tram.

Description

Cable for electric train}

The present invention relates to a cable for a train, and more particularly to a cable for a train having improved mechanical strength.

Today, there is a campaign to urge the use of trams to solve environmental problems or traffic problems, and tram routes are also increasing.

The principle of moving the trolley is that the trolley receives power from a cable provided in the air by using a pantagraph provided at the top and moves the supplied power as a driving force. In order for such a train to move smoothly, the performance of the train itself is also important, but the quality of the cable for supplying electric power to the train is also important.

In order to measure the quality of the cable for electric vehicles, it is general to measure the mechanical strength and the electric conductivity of the electric cable and analyze the result. In other words, a cable for a train needs to be supplied with electric power from a power supply to a moving train, which requires high conductivity, extends not only tens of kilometers or hundreds of kilometers, but also has high tensile strength And wear strength. Accordingly, the manufacturer endeavors to improve the mechanical strength and electrical conductivity of the above-mentioned electric cable.

However, most of the cables used in the market are made of copper or aluminum. However, a cable for a car made of copper or aluminum has a drawback in that it has high tensile strength and low abrasion strength and high maintenance cost because of high electrical conductivity. That is, a cable for a car made of copper or aluminum is easily worn out due to friction with a pantograph, and the cable is bent or bent due to a low tensile strength. Particularly, since copper is expensive, there is a problem that the manufacturing cost of the cable for a train increases when the cable for a train is formed by the copper.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cable for a train having enhanced mechanical strength.

Other objects and advantages of the present invention will become apparent from the following description, and it will be understood by those skilled in the art that the present invention is not limited thereto. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

In order to achieve the above object, the present invention provides a cable for a train, wherein aluminum and carbon nanotubes are combined and the weight ratio of the carbon nanotubes to the aluminum is 0.5 to 3 wt%.

Preferably, the carbon nanotubes are formed at an angle of 30 ° or less along the longitudinal direction of the electric cable.

More preferably, at least 80% of the carbon nanotubes distributed on the cable are formed at an angle of 30 ° or less along the longitudinal direction of the electric cable.

The present invention has the advantage of improving the mechanical strength of a cable for a tram, thereby extending the service life of the cable for the tram and reducing the maintenance cost for the cable for the tram.

Further, the present invention has an advantage of supplying electric power smoothly to a train by maintaining the electrical conductivity lowered when the mechanical strength is improved to about 50% IACS (International Annealed Copper Standard) or higher.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention. And shall not be construed as limited to such matters.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a cable for a train and a pantagraph according to an embodiment of the present invention; Fig.
2 is a cross-sectional view of a cable for a train according to an embodiment of the present invention.
FIG. 3 is a graph comparing the physical properties of a cable for a tank made of 1 wt% of carbon to a carbon nanotube, and a cable for a car made of various copper alloys or pure copper.

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: There will be. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention, a carbon nanotube (CNT) applied to the present invention will be briefly described.

Carbon nanotubes have a cylindrical structure in which a carbon source is bonded to three different carbon atoms, and a graphite sheet forming a hexagonal honeycomb pattern is rolled into a nano-sized diameter and hollowed inside thereof. The carbon nanotubes have electrical conductivity similar to copper, thermal conductivity is equal to diamond, and strength is known to be higher than steel.

1 is a view showing a tram cable 10 and a pantograph 20 according to an embodiment of the present invention.

Referring to FIG. 1, a cable 10 according to the present invention is in contact with a pantograph 20 provided at an upper portion of a train, and uses the pantograph 20 to supply electric power to the train. Further, although not shown in the drawings, the cable for a train 10 is supported by a plurality of wires to float in the air. The tram cable 10 should have a high abrasion strength as it is rubbed by the pantograph 20 and a high tensile strength because it extends beyond several Km.

Accordingly, the electric cable 10 according to the present invention has a plurality of aluminum-carbon composites disposed therein to improve the abrasion strength and the tensile strength.

2 is a cross-sectional view of a cable 10 for a train according to an embodiment of the present invention.

As shown in FIG. 2, a cable 10 for a train according to an embodiment of the present invention is formed of aluminum 12 and a plurality of carbon nanotubes 11 dispersed in the aluminum 12.

The carbon nanotubes 11 are oriented at an angle of 30 degrees or less along the longitudinal direction of the electric cable 10 in consideration of the mechanical strength and electric conductivity of the electric cable 10. When the carbon nanotubes 11 are oriented at an angle of more than 30 degrees along the longitudinal direction of the electric cable 10, the interface between the aluminum base and the carbon nanotubes 11 interferes with the progress of the electric current, It is preferable that the carbon nanotubes 11 are oriented at an angle of 30 ° or less along the longitudinal direction of the electric cable 10. [

More preferably, at least 80% of the plurality of carbon nanotubes 11 are oriented at an angle within 30 DEG along the longitudinal direction of the electric cable 10. In addition, when the orientation ratio of the carbon nanotubes 11 formed within 30 ° along the longitudinal direction of the cable 10 is less than 80%, the interface between the aluminum base and the carbon nanotubes 11 becomes inconsistent, The mismatched interface acts as an initial crack initiation point where initial tensile stress is applied, and as a result there is a risk that the loss of electrical conductivity and tensile strength of the cable 10 is increased. Therefore, it is preferable that at least 80% of the plurality of carbon nanotubes 11 formed on the electric cable 10 are oriented at an angle of 30 ° or less along the longitudinal direction of the electric cable 10.

On the other hand, the electric cable 10 has different electrical conductivity and mechanical strength depending on the weight ratio of the carbon nanotube 11 and the aluminum 12.

Table 1 below is a table showing the results of tests on wear strength, electrical conductivity and tensile strength of specimens prepared according to one embodiment of the present invention and pure aluminum and pure specimens.
Pure
Pure aluminum
CNT
0.2 wt%
CNT 0.5wt%
CNT 1wt%
CNT
3wt%
CNT
8wt%
Wear depth
(탆)
2.9
30.0
25
2.7
2.3
2.2
2.5
Electrical conductivity
(% IACS)
97
60
57
56
55
47
40
The tensile strength
(kgf / mm 2 )
36
18
19
29
45
48
47

Referring to Table 1, the electric cable 10 having the weight ratio of the carbon nanotubes 11 to aluminum 12 in the range of 0.5 wt% to 3 wt% has a lower electric conductivity than that of the conventional electric cable, However, it can be seen that the cable has an excellent level of abrasion strength and a tensile strength equal to or superior to that of the cable for a train formed by the above-mentioned pure copper. The electric cable 10 having a weight ratio of the carbon nanotubes 11 to the aluminum 12 in the range of 0.5 wt% to 3 wt% is not significantly reduced in electric conductivity as compared with the conventional electric cable formed of pure aluminum , The tensile strength and the abrasion strength are remarkably improved.

However, the cable 10 for a train having a weight ratio of the carbon nanotubes 11 to aluminum 12 of 0.2 wt% or less has a tensile strength of 19 kgf / mm 2 , The improvement level of the tensile strength is weak compared to the conventional electric train line formed of pure aluminum, and the level of improvement of the abrasion strength is also weak. The electric cable 10 having a weight ratio of the carbon nanotubes 11 to the aluminum 12 is 8 wt% or more. The electric conductivity of the cable 10 drops rapidly to 40% IACS (International Annealed Copper Standard) The tensile strength is rather reduced.

Therefore, it is preferable that the weight ratio of the carbon nanotubes 11 to the aluminum 12 formed on the electric cable 10 is 0.5 wt% to 3 wt%.

3 is a graph comparing the physical properties of a cable for a train 10 made of 1 wt% of carbon nanotubes 11 compared to aluminum 12 and a cable for a train made of various copper alloy materials or pure copper.

At least 80% of the plurality of carbon nanotubes 11 formed on the electric cable 10 having a weight ratio of 1 wt% of the carbon nanotubes 11 are arranged at 30 degrees along the longitudinal direction of the electric cable 10 Or less.

3, it can be seen that the electric cable 10 manufactured according to the present invention has a lower electric conductivity than the cable for electric vehicles formed of pure copper or other copper alloy materials, but the non-electric strength is greatly improved. That is, the cable 10 for the electric car having the weight ratio of the carbon nanotubes 11 to the aluminum 12 is 1 wt%, compared with the cable for the electric car made of pure copper or copper alloy except for the tin-copper (Sn copper) , The conductivity is lowered by about 9% to 44%, but the specific strength is greatly improved to the level of about 130% to 300%.

As described above, the electric cable 10 according to the embodiment of the present invention has a slightly reduced electrical conductivity as compared with conventional and electric cables, but the mechanical strength is greatly improved. Accordingly, the electric cable 10 according to the embodiment of the present invention has improved mechanical strength as compared with the conventional electric cable for a long time, Thereby reducing the maintenance cost of the cable 10 for the tram.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

10: Tank cable 11: Carbon nanotube
12: aluminum 20: pantograph

Claims (3)

A cable for a train which supplies electric power to a train,
Wherein the weight ratio of the carbon nanotubes to the aluminum is 0.5 to 3 wt%
Wherein at least 80% of the carbon nanotubes distributed on the cable are formed at an angle of 30 ° or less along the longitudinal direction of the cable. delete delete
KR1020100025327A 2010-03-16 2010-03-22 Cable for electric train KR101682504B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020100025327A KR101682504B1 (en) 2010-03-22 2010-03-22 Cable for electric train
US13/049,103 US8658902B2 (en) 2010-03-16 2011-03-16 Electrical transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100025327A KR101682504B1 (en) 2010-03-22 2010-03-22 Cable for electric train

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Publication Number Publication Date
KR20110106097A KR20110106097A (en) 2011-09-28
KR101682504B1 true KR101682504B1 (en) 2016-12-05

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9872384B2 (en) * 2016-05-18 2018-01-16 The Boeing Company Elongated, ultra high conductivity electrical conductors for electronic components and vehicles, and methods for producing the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005040065A1 (en) * 2003-10-29 2005-05-06 Sumitomo Precision Products Co., Ltd. Method for producing carbon nanotube-dispersed composite material
JP2009013475A (en) * 2007-07-05 2009-01-22 Sumitomo Precision Prod Co Ltd Composite material with high thermal conductivity

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005040065A1 (en) * 2003-10-29 2005-05-06 Sumitomo Precision Products Co., Ltd. Method for producing carbon nanotube-dispersed composite material
JP2009013475A (en) * 2007-07-05 2009-01-22 Sumitomo Precision Prod Co Ltd Composite material with high thermal conductivity

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