Cable for laying overhead power line of railway contact network with pantograph

Abstract

A cable comprises a cable core or a core wire composed of seven single-strand copper wires which are arranged orthogonally or linearly, the cable core or the core wire is surrounded by twelve single-strand wires which are arranged in the radial direction, and the twelve single-strand wires comprise copper-clad steel cores so as to prevent the cable from being stolen.

Description

Technical Field

[0001] The present invention relates to a cable for laying railway overhead power lines with pantographs, in particular to an anti-theft cable for laying overhead contact lines (called catenary). Background Art

[0002] Various aspects of the present invention generally relate to cables for use in railway power line laying.

[0003] Currently, most cables used for railway power lines are bare copper cables, which are susceptible to theft and are often cut from the lines and subsequently resold or recycled.

[0004] Currently, theft-proof or vandal-proof cables have only a core consisting of copper wires. When theft protection is required, thin steel bars are usually placed on the cable, which degrades the physical and mechanical properties of the cable, making it incompatible for use in overhead contact lines due to its physical and electrical characteristics.

[0005] The existing 100% electrolytic copper overhead power transmission cables for railway pantographs in the market have some disadvantages of being easily cut and having a high resale value.

[0006] In view of the following description of the invention and the detailed description of certain preferred embodiments, some specific objects and advantages of the invention will be apparent to those skilled in the art, that is, those with knowledge or experience in this technical field. Copper cables for overhead laying are a widely used system.

[0007] The advantage of the cable of the present invention lies in its manufacturing process. The cable includes a cable core or core wire composed of 7 single copper wires arranged orthogonally or linearly, and the cable core or core wire is surrounded by 12 copper-clad steel core single wires arranged radially. Each of the copper-clad steel core single wires includes a copper-clad steel core using copper-steel technology to prevent it from being stolen.

[0008] For example, Chinese patent publication number CN1815637A describes an embodiment of the process and method for manufacturing and designing the cable, which relates to an anti-theft cable, which includes a twisted conductor and a sheath for covering the conductor. It is characterized in that hard metal bars arranged end to end in a linear manner are installed in the core of the twisted conductor. The hardness of the hard metal bars is high enough to prevent cutting tools such as long iron shears, hand saws or axes from cutting in. It is difficult for thieves to cut all the wires at once. Therefore, the police or patrol team can gain more time. Its advantages are: simple structure, low cost, and good protection against cutting by thieves.

[0009] Another example can be found in US Pat. No. US8621725B2, which relates to a cable theft prevention device having a first body and a second body, which allows a cable conductor to pass through and inhibits the movement of the cable conductor by friction and compression, thereby preventing the cable conductor from moving through the first body and the second body. The tension applied to the cable conductor causes the first body and the second body to cling to the cable conductor, thereby preventing the cable from being stolen. Summary of the invention

[0010] Various aspects of the present invention may be used to advantageously provide a conductive cable for railway power lines having a special cable core to prevent cable theft and which is compatible for use in overhead contact wires without requiring major modifications.

[0011] An overhead power cable for railway lines, comprising a cable core or core wire consisting of 7 single copper wires arranged orthogonally or linearly, surrounded by 12 single wires arranged radially, the 12 single wires comprising a copper-clad steel core to prevent theft. The steel core with radial outer layers prevents the cable from being easily cut, thereby preventing the stolen cable from being resold because it cannot be separated. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The figure is a cross-sectional view of an overhead power cable for railways according to the present invention.

[0013] Figure 2 is a perspective view of a portion of a cable according to the present invention.

[0014] Figure 3 It is a plan view of an external protection single strand wire according to the present invention.

[0015] Figure 4 is a perspective view of a cable reel according to the present invention.

[0016] Figure 5 The present invention is a front view of a train connected to a contact network via a pantograph. DETAILED DESCRIPTION

[0017] Figure 1 A cross-sectional view of a cable (1) is shown, the cable (1) comprising a core or wire (2) consisting of seven single copper wires (3) arranged orthogonally or linearly, the core or wire (2) being surrounded by twelve single copper wires (4) arranged radially, wherein the twelve single copper wires (4) comprise a copper-clad steel core (5) to prevent theft. The steel core (5) with radial outer layers prevents the cable from being easily cut, thereby preventing the stolen cable from being resold because it cannot be separated.

[0018] The cable (1) consists of the following parts:

[0019] Cable core (2): composed of 7 single copper wires (3)

[0020] External radial arrangement: consists of 12 single-strand copper-clad steel wires (5).

[0021] Single copper wire (3) diameter: 3.67mm

[0022] Cable diameter: 18.35mm

[0023] Cable cross-sectional area: 201.0mm 2

[0024] Copper area ratio: 66%

[0025] Steel area ratio: 34%

[0026] Linear weight: 1,720kg / km

[0027] Specific gravity: 8.53g / cm 3

[0028] Mechanical strength: 6,800Kgf

[0029] Expansion coefficient: 0.00001513 1 / ℃

[0030] Elastic modulus: 154GPa

[0031] Equivalent conductivity: 70% IACS

[0032] Resistance variation coefficient: 0.004274 1 / ℃

[0033] DC resistance (at 20°C): 0.12250Ω / km

[0034] DC resistance (at 75°C): 0.15130Ω / km

[0035] Inductive resistance (60Hz): 0.19207Ω / km

[0036] Capacitive resistance (60Hz): 0.12163MΩ / km

[0037] Continuous current capacity at 75°C: 670A

[0038] Short-circuit current capacity at 50ms: 144300A

[0039] Short-circuit current capacity at 100ms: 102000A

[0040] Short-circuit current capacity at 500ms: 45640A

[0041] exist Figure 2 In FIG. 1 , a perspective view of the cable ( 1 ) is shown, in which it can be seen how the twelve single-strand copper-clad steel wires ( 4 ) are interwoven or wound around a cable core or wire ( 2 ) consisting of seven single-strand copper wires ( 3 ).

[0042] exist Figure 3 In the figure, a detail of a single strand wire (4) having a copper-clad steel core (5) is shown, the steel core (5) being sheathed with copper (6).

[0043] exist Figure 4 In the figure, a perspective view of a cable reel (7) is shown, which carries a cable (1) weighing 80kg to 100kg and has dimensions of 700mm outer diameter, 500mm inner diameter and 150mm length.

[0044] The cable (1) is designed to be used as a signal cable in an overhead contact network line (8) of a railway, which transmits power for the operation of a train (9) through a pantograph (10) rather than being used for a grounding system.

[0045] The overhead contact network line (8) used by the railway company is a CR 160 line. The function of the overhead power line (8) is to provide a power contact surface parallel to the rail (11) for the train (9) so as to transmit power to the train (9) through the pantograph (10). In order to achieve this function, a group of cables (1) that are closely matched in physical and electrical aspects must be used. The advantage of the cable (1) of the present invention is that it can technically replace the traditional copper signal cable without making major changes to the system or the cable bearing structure (12), and only the mechanical tension of the line needs to be adjusted as needed.

[0046] The cable (1) of the present invention has the same electrical conductivity as a 300 MCM copper cable, and has the advantage that when replacing the cables of an old system with the cables of the present invention, the installation of the existing structure, i.e. the poles or the bearing structure (12) of the line (1), can be maintained.

[0047] Since the cable (1) of the present invention has a slightly larger diameter (2.4 mm larger), the same fasteners can be used.

[0048] Another advantage is that after the cable (1) is installed, it looks no different from a normal copper cable. From a practical point of view, in the same installation environment, overhead lines with and without this technology can be used at the same time, thus forming a homogeneous installation, which helps to distinguish areas where copper cables are still present.

[0049] exist Figure 5In the figure, a front view of a train (9) is shown, which is connected to an overhead contact network (8) supported by a support or cable bearing structure (12) via a pantograph (10), wherein the train (9) running along a rail (11) obtains electrical energy provided by a cable (1) via the pantograph (10) and provides power for the locomotive of the train (9).

[0050] The fact that the cable (1) is used exclusively for railway applications facilitates criminal prosecution, as no one other than the railway authorities has this material, while copper cables are used by distribution and transmission companies, so arresting a person with this cable (1) will not currently lead to criminal prosecution without further evidence.

[0051] Due to the similar expansion coefficient as copper, the overall contact geometry of the cable (1) behaves very similarly to that of a copper contact when the temperature changes.

[0052] Thus, while the core innovative features of various embodiments have been shown, described, and pointed out, it will be understood that those skilled in the art may omit, substitute, and change the forms and details shown without departing from the spirit and scope of the present invention.

[0053] Practicality

[0054] The invention can be used in industrial fields according to its application, especially in the cable manufacturing and metal machinery industry in combination with safety equipment.

[0055] Reference numerals list

[0056] 1 Cable

[0057] 2 Cable core or core wire

[0058] 3 inner single strand copper wire(7)

[0059] 4 outer single strand copper wire (12)

[0060] 5 Steel core

[0061] 6 Copper cladding of outer single strand wire

[0062] 7 Cable reel

[0063] 8 Overhead contact network

[0064] 9 Train

[0065] 10 Pantograph

[0066] 11 Rails (tracks)

[0067] 12 Cable-carrying structures or poles

Claims

1. A cable (1) for laying a railway overhead power line with a pantograph (10), comprising a cable core or core wire (2) composed of seven single copper wires (3) arranged orthogonally or linearly, wherein the cable core or core wire (2) is surrounded by twelve single copper wires (4) arranged radially, wherein: The twelve single copper wires (4) include a copper-clad steel core (5), wherein the design of the cable structure - unlike the prior art that uses rigid steel bars to prevent theft - can perfectly adapt to existing structures without replacing fasteners or hardware, characterized in that the structure of the central single wire (7) and the copper-clad steel core (5) single wires - prevents or hinders the theft of the cable by making it impossible to separate the cable.

2. The cable (1) according to claim 1, characterized in that Its DC resistance at 20°C is 0.12250 Ω / km.

3. The cable (1) according to claim 2, characterized in that Its DC resistance at 75°C is 0.15130 Ω / km.

4. The cable (1) according to claim 3, characterized in that: - Inductive resistance (60 Hz): 0.19207 Ω / km - Capacitive resistance (60 Hz): 0.12163 MΩ / km - Continuous current capability at 75°C: 670 A - Short-circuit current capacity at 50ms: 144300 A - Short-circuit current capacity at 100ms: 102000 A - Short-circuit current capacity at 500ms: 45640 A.

5. The cable (1) according to claim 4, characterized in that The cable (1) is specially adapted to work in an overhead power line or contact network (8), which supplies electrical energy to an electrically driven train (9) and facilitates the movement of the train via a pantograph (10) arranged above the train (9).

6. The cable (1) according to claim 5, characterized in that It is sufficient to replace the commonly used copper signal cables without any major changes to the system or cable carrying structure (12), only requiring adjustments to the mechanical tension of the line and using the same fasteners and hardware, as the cable diameter is only 2.4 mm larger than the cable currently used.

7. The cable (1) according to claim 6, characterized in that The cable of the present invention has an electrical conductivity comparable to that of a 300 MCM 19-strand copper electrolytic copper conductor.

8. The cable (1) according to claim 7, characterized in that The cable is wound on a cable reel (7) which carries 80 kg to 100 kg of cable and has dimensions of 700 mm outer diameter, 500 mm inner diameter and 150 mm length.

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