Anti-fatigue locomotive cable for bridging

Abstract

The invention relates to the field of special cables, in particular to an anti-fatigue locomotive cable for bridging, which comprises a wire core, and a first shielding layer, an insulating layer, a second shielding layer, a third shielding layer and an outer protection layer which are sequentially wrapped outside the wire core from inside to outside, a first wrapping tape wrapping the outside of the wire core is arranged between the wire core and the first shielding layer; a second wrapping tape wrapping the second shielding layer is arranged between the second shielding layer and the third shielding layer; a third wrapping tape wrapping the third shielding layer is arranged between the third shielding layer and the outer protection layer. The wire core is a tinned soft copper conductor; and the outer protection layer is a halogen-free low-smoke flame-retardant rubber protection layer. And a fourth wrapping tape is added outside the third shielding layer, so that the friction force of the cable in the bending process can be reduced, the third shielding layer has a longer service life, and the fatigue resistance of the cable is improved.

Description

Technical Field

[0001] The invention relates to the field of special cables, in particular to a fatigue-resistant jumper locomotive cable. Background Art

[0002] 30kV rolling stock cables are suitable for connecting high-voltage power transmission and distribution equipment in railway locomotives, and are mainly used for power supply and other functions. The cables are required to be acid and alkali resistant, high and low temperature resistant, corrosion resistant, vibration resistant, wear resistant, highly flexible, and small in space. At present, traditional rolling stock cables may have undesirable phenomena such as cable cracking, premature aging, and surface cracking during the operation of the locomotive. Summary of the invention

[0003] In view of the above problems, a fatigue-resistant jumper locomotive cable is provided, which has strong fatigue resistance.

[0004] In order to solve the problems of the prior art, the present invention provides a fatigue-resistant hopping locomotive cable, comprising a wire core and a first shielding layer, an insulating layer, a second shielding layer, a third shielding layer and an outer protective layer wrapped around the outside of the wire core in sequence from the inside to the outside; a first wrapping tape wrapped around the outside of the wire core is provided between the wire core and the first shielding layer; a second wrapping tape wrapped around the outside of the second shielding layer is provided between the second shielding layer and the third shielding layer; a third wrapping tape wrapped around the outside of the third shielding is provided between the third shielding layer and the outer protective layer; the wire core is a tinned soft copper conductor; and the outer protective layer is a halogen-free low-smoke flame-retardant rubber protective layer.

[0005] Preferably, the first wrapping tape and the second wrapping tape are both semi-conductive tapes.

[0006] Preferably, the semi-conductive tape is a nylon tape.

[0007] Preferably, the first shielding layer is an extruded semi-conductive conductor shielding layer.

[0008] Preferably, the second shielding layer is an extruded semi-conductive insulating shielding layer.

[0009] Preferably, the third wrapping tape is a rubber-coated cotton cloth tape.

[0010] Preferably, a fourth wrapping tape is provided between the third shielding layer and the third wrapping tape.

[0011] Preferably, the fourth wrapping tape is a polyester tape isolation layer.

[0012] Preferably, the third shielding layer is a tinned copper wire mesh layer.

[0013] Preferably, the insulating layer is an EPDM insulating layer.

[0014] Compared with the prior art, the beneficial effect of the present invention is that adding a fourth wrapping tape (polyester tape isolation layer) outside the third shielding layer (tinned copper wire mesh layer) can reduce the friction of the cable during bending, so that the third shielding layer has a longer service life and improves the fatigue resistance of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a structural schematic diagram of a fatigue-resistant jumper locomotive cable.

[0016] The numbers in the figure are: 1, wire core; 2, first tape; 3, first shielding layer; 4, insulation layer; 5, second shielding layer; 6, second tape; 7, third shielding layer; 8, fourth tape; 9, third tape; 10, outer protective layer. DETAILED DESCRIPTION

[0017] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] See also Figure 1 The fatigue-resistant jumper locomotive cable shown comprises a wire core 1 and a first shielding layer 3, an insulating layer 4, a second shielding layer 5, a third shielding layer 7 and an outer protective layer 10 wrapped around the outside of the wire core 1 in sequence from the inside to the outside; a first wrapping tape 2 wrapped around the outside of the wire core 1 is provided between the wire core 1 and the first shielding layer 3; a second wrapping tape 6 wrapped around the outside of the second shielding layer 5 is provided between the second shielding layer 5 and the third shielding layer 7; a third wrapping tape 9 wrapped around the outside of the third shielding is provided between the third shielding layer 7 and the outer protective layer 10; the wire core 1 is a tinned soft copper conductor; the outer protective layer 10 is a halogen-free low-smoke flame-retardant rubber protective layer. Adding a fourth wrapping tape 8 (polyester tape isolation layer) outside the third shielding layer 7 (tinned copper wire mesh layer) can reduce the friction of the cable during bending, so that the third shielding layer 7 has a longer service life.

[0019] Wherein, the first wrapping tape 2 and the second wrapping tape 6 are both semi-conductive tapes. The semi-conductive tape is a nylon tape. The first shielding layer 3 is an extruded semi-conductive conductor shielding layer. The second shielding layer 5 is an extruded semi-conductive insulating shielding layer. The third wrapping tape 9 is a rubber-coated cotton cloth tape. A fourth wrapping tape 8 is provided between the third shielding layer 7 and the third wrapping tape 9. The fourth wrapping tape 8 is a polyester tape isolation layer. The third shielding layer 7 is a tinned copper wire mesh layer. The insulating layer 4 is an ethylene-propylene rubber insulating insulating layer 4. Specific embodiment:

[0021] The thickness of the first shielding layer 3 is 1 mm.

[0022] The thickness of the second shielding layer 5 is 1.1-1.2 mm.

[0023] The thickness of the insulating layer 4 is 8 mm.

[0024] The thickness of the outer protective layer 10 is 3.5 mm.

[0025] The thickness of the third wrapping tape 9 is 0.3 mm.

[0026] The thickness of the fourth wrapping tape 8 is 0.04 mm.

[0027] The third shielding layer 7 has a single wire diameter of no more than 0.6 mm and is a tin-copper wire mesh layer formed by sparsely winding 102 0.6 mm tinned copper wires.

[0028] A fatigue-resistant jumper locomotive cable invented, the specific parameters are as follows:

[0029] Operating temperature: -40~90℃;

[0030] Storage temperature: -40~90℃;

[0031] Design temperature: -40~90℃;

[0032] Rated voltage: 26 / 45kV;

[0033] Rated current (at 30°C): 95mm2, 479A; 120mm2, 557A; 240mm2: 864A;

[0034] Withstand voltage: 105kV / 5min or 75kV / 30min;

[0035] Partial discharge: 52kV, less than 5pC;

[0036] 4h withstand voltage: 120kV / 4h without breakdown;

[0037] Withstand impulse voltage and subsequent power frequency voltage: 10 times of positive and negative AC impulse withstand voltage of 250kV without breakdown, followed by 75kV, 15min withstand voltage test without breakdown;

[0038] Bending test and subsequent partial discharge test: After the bending test, the partial discharge at 52kV is not more than 5pC;

[0039] Thermal cycle test and subsequent partial discharge test: After the thermal cycle test, the partial discharge at 52kV is not more than 5pC;

[0040] Dielectric loss tgδ measurement: under 30kV voltage, no more than 50×10-4;

[0041] Ozone resistant: no cracks;

[0042] Oil resistance: I RM 902, 100±2℃, 72h, the retention rate of sheath tensile strength and elongation at break is greater than or equal to 60%;

[0043] Low temperature resistance: -40℃;

[0044] Flame retardant: single flame retardant;

[0045] Low smoke: light transmittance not less than 60%;

[0046] Halogen-free: Hydrogen chloride release is not more than 0.5%, fluorine content is not more than 0.1%, pH value is not more than 4.3, conductivity is not more than 10μS / mm;

[0047] Toxicity index: less than or equal to 5;

[0048] Weather resistance: After 1008h, the change rate of sheath tensile strength and elongation is ≤±30%;

[0049] Bending radius: 5 times the outer diameter of the cable;

[0050] Dynamic fatigue test: After 500,000 dynamic fatigue tests, the cable was not damaged and the electrical performance met the requirements of TB / T1484.2-2017 standard;

[0051] Fire protection: EN45545-2:

[0052] Environmental protection: TB / T 3139-2021:

[0053] Sheath performance: Carry out high temperature pressure, crack resistance, abrasion and shrinkage tests according to GB / T 12706.3.

[0054] Note: The rated current value is for single-wire installation. For other ambient temperatures, use the temperature conversion coefficients in Table 1-1 below to calculate the current carrying capacity. The installation conversion coefficients are shown in Table 1-2.

[0055] Table 1-1 Temperature conversion coefficient:

[0056] ℃ 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 f 1.15 1.12 1.08 1.04 1.0 0.96 0.91 0.87 0.82 0.76 0.71 0.65 0.58 0.50 0.41

[0057] Table 1-2 Laying conversion coefficients:

[0058] Pipe penetration (inside pipeline) Surface laying Laying under the board f 0.80 0.95 0.90

[0059] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A fatigue-resistant jumper locomotive cable, characterized in that: It comprises a wire core (1), and a first shielding layer (3), an insulating layer (4), a second shielding layer (5), a third shielding layer (7), and an outer protective layer (10) which are sequentially wrapped around the outside of the wire core (1) from the inside out; A first wrapping tape (2) wrapped around the outside of the wire core (1) is provided between the wire core (1) and the first shielding layer (3); A second wrapping tape (6) is provided between the second shielding layer (5) and the third shielding layer (7) and is wrapped around the outside of the second shielding layer (5); A third wrapping tape (9) wrapped around the outside of the third shielding layer is provided between the third shielding layer (7) and the outer protective layer (10); The wire core (1) is a tinned soft copper conductor; The outer protective layer (10) is a halogen-free, low-smoke, flame-retardant rubber protective layer.

2. A fatigue-resistant jumper locomotive cable according to claim 1, characterized in that: The first wrapping tape (2) and the second wrapping tape (6) are both semi-conductive tapes.

3. A fatigue-resistant jumper locomotive cable according to claim 2, characterized in that: The semi-conductive tape is a nylon tape.

4. A fatigue-resistant jumper locomotive cable according to claim 1, characterized in that: The first shielding layer (3) is an extruded semi-conductive conductor shielding layer.

5. The fatigue-resistant jumper locomotive cable according to claim 1, characterized in that: The second shielding layer (5) is an extruded semi-conductive insulating shielding layer.

6. The fatigue-resistant jumper locomotive cable according to claim 1, characterized in that: The third wrapping tape (9) is a rubber-coated cotton cloth tape.

7. The fatigue-resistant jumper locomotive cable according to claim 1, characterized in that: A fourth wrapping tape (8) is provided between the third shielding layer (7) and the third wrapping tape (9).

8. The fatigue-resistant jumper locomotive cable according to claim 6, characterized in that: The fourth wrapping tape (8) is a polyester tape isolation layer.

9. The fatigue-resistant jumper locomotive cable according to claim 1, characterized in that: The third shielding layer (7) is a tinned copper wire mesh layer.

10. The fatigue-resistant jumper locomotive cable according to claim 1, characterized in that: The insulating layer (4) is an ethylene propylene rubber insulating layer (4).

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