Grounding device and method for outdoor terminal of high-voltage cable of motor train unit

Abstract

The invention discloses a grounding device and method for a high-voltage cable outdoor terminal of a motor train unit. The grounding device comprises a semi-conductive belt, a semi-conductive heat shrink tube, a waterproof belt, a waterproof sealant and an insulating heat shrink tube, the method comprises the following steps: winding a high-voltage cable shielding copper wire by using a semi-conductive belt, and performing leakage current treatment; then winding a high-voltage cable semi-conductive layer above the semi-conductive belt and a high-voltage cable outer sheath below the semi-conductive belt by using a waterproof belt, winding a rubber part at the lower part of the last umbrella skirt of the high-voltage cable outdoor terminal by using waterproof sealant, and carrying out waterproof sealing treatment; and finally, performing thermal shrinkage protection by using a semi-conductive thermal shrinkage tube and an insulating thermal shrinkage tube. By using the grounding device and method, the waterproof performance of the bottom of the outdoor terminal can be ensured, the problem of insulation performance reduction caused by water inflow and the like can be avoided, the ablation problem caused by bottom leakage current aggregation of a non-grounding end high-voltage cable outdoor terminal can be solved, the safety of the high-voltage cable outdoor terminal is improved, and the service life of the high-voltage cable outdoor terminal is prolonged. Therefore, the driving safety is ensured.

Description

Technical Field

[0001] The invention relates to an outdoor terminal of a high-voltage cable of an EMU, and in particular to a grounding device and method for the outdoor terminal of a high-voltage cable of an EMU. Background Art

[0002] The high-voltage cable assembly consists of the high-voltage cable and the cable accessories at both ends. It is an important part of the high-voltage system of the EMU and is used to realize the electrical connection between the high-voltage circuit on the roof and the traction transformer under the vehicle. The high-voltage cable outdoor terminal is one of the high-voltage cable accessories. It is installed at the end of the cable to ensure the electrical connection with other parts of the system and maintain insulation to the connection point. Its safety and reliability directly affect driving safety.

[0003] During the use of high-voltage cable outdoor terminals, it is easy to cause failures due to reasons such as on-site installation quality, moisture intrusion, short circuit, etc., which will reduce the insulation of the product and cause safety accidents; at the same time, in order to avoid the influence of other high-voltage components, the grounding of the high-voltage cable needs to be processed to ensure the normal use and safety of the high-voltage cable and outdoor terminals. In order to avoid circulating current heating, the high-voltage cable assemblies of the EMU are all single-sided grounding. Since the EMU grounding system is connected to the earth through the contact between the wheels and the rails, the bottom of the high-voltage cable outdoor terminal at the end where the grounding wire is not drawn is prone to leakage current accumulation. Therefore, the bottom grounding of this type of outdoor terminal needs to be specially processed to avoid ablation caused by leakage current.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a grounding device and method for an outdoor terminal of a high-voltage cable of a train set, so as to solve the above-mentioned technical problems existing in the prior art.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] The grounding device of the outdoor terminal of the high-voltage cable of the EMU of the present invention comprises a semi-conductive tape, a semi-conductive heat shrink tube, a waterproof tape, a waterproof sealant, and an insulating heat shrink tube;

[0008] The semi-conductive tape is connected to the semi-conductive layer and the shielding copper wire of the high-voltage cable, and overlapped with the semi-conductive heat shrink tube;

[0009] The semi-conductive heat shrink tube is fixed to the leaking cable gathering position at the bottom of the high-voltage cable outdoor terminal by heat shrinkage;

[0010] The waterproof tape is wound around the bottom of the outdoor terminal of the high-voltage cable;

[0011] The waterproof sealant is applied to the bottom of the outdoor terminal of the high-voltage cable;

[0012] The insulating heat shrinkable tube is overlapped with the waterproof tape and fixed by heat shrinkage.

[0013] The method for grounding the grounding device of the outdoor terminal of the high-voltage cable of the EMU mentioned above comprises the steps of:

[0014] First, the shielding copper wire of the high-voltage cable is cut off and folded back;

[0015] Secondly, use semi-conductive tape to wrap the shielding copper wire of the high-voltage cable to handle leakage current;

[0016] Then use waterproof tape to wrap the semi-conductive layer of the high-voltage cable above the semi-conductive tape and the outer sheath of the high-voltage cable below, and use waterproof sealant to wrap the rubber part at the bottom of the last umbrella skirt of the outdoor terminal of the high-voltage cable for waterproof sealing;

[0017] Finally, use semi-conductive heat shrink tubing and insulating heat shrink tubing for heat shrink protection.

[0018] Compared with the prior art, the grounding device and method for the outdoor terminal of the high-voltage cable of the EMU provided by the present invention uses waterproof sealant, waterproof tape, and insulating heat shrink tube to carry out waterproof treatment to avoid the reduction of insulation performance due to water ingress, etc., and at the same time connects the semi-conductive tape and the semi-conductive heat shrink tube to the copper wire shield of the high-voltage cable to avoid the accumulation of leakage current at the bottom of the outdoor terminal of the high-voltage cable at the non-grounded end. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall schematic diagram of the outdoor terminal of the high-voltage cable of the EMU and its grounding device in the embodiment of the present invention;

[0020] Figure 2 It is a detailed structural schematic diagram of the grounding device of the outdoor terminal of the high-voltage cable of the EMU in the embodiment of the present invention;

[0021] In the figure:

[0022] 1. Semi-conductive tape 2. Semi-conductive heat shrink tube 3. Waterproof tape 4. Waterproof sealant 5. Insulating heat shrink tube 6. Outdoor terminal bottom rubber part 7. Cable semi-conductive layer 8. Cable semi-conductive step 9. Cable shielding copper wire 10. Cable outer sheath 11. Outdoor terminal umbrella skirt. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, which does not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0024] First, the terms that may be used in this article are explained as follows:

[0025] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0026] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0027] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0028] Unless otherwise specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0029] The orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings and are only for the convenience and simplification of description, and do not explicitly or implicitly indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation of this document.

[0030] The contents not described in detail in the examples of the present invention belong to the prior art known to professionals in the field. If no specific conditions are specified in the examples of the present invention, the conditions are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used in the examples of the present invention, they are all conventional products that can be purchased commercially.

[0031] The grounding device of the outdoor terminal of the high-voltage cable of the EMU of the present invention comprises a semi-conductive tape, a semi-conductive heat shrink tube, a waterproof tape, a waterproof sealant, and an insulating heat shrink tube;

[0032] The semi-conductive tape is connected to the semi-conductive layer and the shielding copper wire of the high-voltage cable, and overlapped with the semi-conductive heat shrink tube;

[0033] The semi-conductive heat shrink tube is fixed to the leaking cable gathering position at the bottom of the high-voltage cable outdoor terminal by heat shrinkage;

[0034] The waterproof tape is wound around the bottom of the outdoor terminal of the high-voltage cable;

[0035] The waterproof sealant is applied to the bottom of the outdoor terminal of the high-voltage cable;

[0036] The insulating heat shrinkable tube is overlapped with the waterproof tape and fixed by heat shrinkage.

[0037] The semi-conductive tape is shaped by winding to facilitate overlapping with the outermost semi-conductive heat shrink tube;

[0038] The semi-conductive heat shrinkable tube is used for heat shrink protection. On the one hand, the leaked cables gathered at the bottom of the outdoor terminal of the high-voltage cable are guided away through the semi-conductive tape and the cable shielding copper wire. On the other hand, it has waterproof, UV-resistant and aging-resistant functions.

[0039] The waterproof tape is used for waterproofing the bottom of the outdoor terminal of the high-voltage cable and can be shaped by winding;

[0040] The waterproof sealant is used for waterproofing the bottom of the outdoor terminal of the high-voltage cable;

[0041] The insulating heat shrinkable tube can provide heat shrink protection and has the functions of being waterproof, insulating, UV-resistant and aging-resistant.

[0042] The method for grounding the grounding device of the outdoor terminal of the high-voltage cable of the EMU mentioned above is characterized by comprising the steps of:

[0043] First, the shielding copper wire of the high-voltage cable is cut off and folded back;

[0044] Secondly, use semi-conductive tape to wrap the shielding copper wire of the high-voltage cable to handle leakage current;

[0045] Then use waterproof tape to wrap the semi-conductive layer of the high-voltage cable above the semi-conductive tape and the outer sheath of the high-voltage cable below, and use waterproof sealant to wrap the rubber part at the bottom of the last umbrella skirt of the outdoor terminal of the high-voltage cable for waterproof sealing;

[0046] Finally, use semi-conductive heat shrink tubing and insulating heat shrink tubing for heat shrink protection.

[0047] The high-voltage cable shielding copper wire needs to be cut according to size and folded back on the outer sheath of the high-voltage cable.

[0048] The semi-conductive tape needs to be wound around the cable shielding copper wire circle by circle until it is basically consistent with the outer diameter of the rubber part at the bottom of the last shed of the outdoor terminal.

[0049] The waterproof tape needs to be wrapped around the semi-conductive layer of the high-voltage cable above the semi-conductive tape and the outer sheath of the high-voltage cable below, and achieve the effect of being basically consistent with the outer diameter of the rubber part at the bottom of the last umbrella skirt of the outdoor terminal and overlapping the outer sheath of the cable in a stepped manner.

[0050] The waterproof sealant needs to be wrapped around the rubber part at the bottom of the outdoor terminal umbrella skirt.

[0051] The semi-conductive heat shrink tube needs to be heat-shrink protected from the half of the rubber part at the bottom of the last umbrella skirt of the outdoor terminal to the lowest waterproof belt.

[0052] The insulating heat shrink tube needs to be heat-shrunk from the bottom of the last shed of the outdoor terminal to the top of the semi-conductive heat shrink tube.

[0053] The outdoor terminals of the EMU high-voltage cables need to be grounded. At the same time, they are easily affected by factors such as moisture intrusion during operation, so they also need to be waterproofed. At the same time, the bottom of the outdoor terminals that do not require grounding wires are prone to burning due to leakage current accumulation, so leakage current processing is also required.

[0054] The above-mentioned grounding device for the outdoor terminal of the high-voltage cable of the EMU is implemented by the following method, including the steps of:

[0055] First, cut off the cable shielding copper wire on the outdoor terminal side where the high-voltage cable grounding wire does not need to be led out, and leave a section to be folded back on the outer sheath of the high-voltage cable;

[0056] Second, use a semi-conductive tape to wrap the remaining shielding copper wire, winding it circle by circle until it is basically consistent with the outer diameter of the rubber part at the bottom of the last shed skirt of the outdoor terminal;

[0057] Third, use waterproof tape to wrap the outer sheath of the high-voltage cable under the semi-conductive tape, wrap it circle by circle, and gradually reduce the number of circles from the outdoor terminal to the high-voltage cable to form a step-like shape;

[0058] Fourth, use waterproof tape to wrap the semi-conductive layer and semi-conductive steps of the high-voltage cable above the semi-conductive tape, winding it circle by circle until it is basically consistent with the outer diameter of the rubber part at the bottom of the last shed skirt of the outdoor terminal;

[0059] Fifth, wrap a layer of waterproof sealant around the rubber part at the bottom of the last shed skirt of the outdoor terminal of the high-voltage cable;

[0060] Sixth, use semi-conductive heat shrink tubing to provide heat shrink protection for the area, from the half of the lower rubber part of the last umbrella skirt of the outdoor terminal to the lowest waterproof belt.

[0061] Seventh, use insulating heat shrink tubing to perform heat shrink protection again, starting from the bottom of the last shed at the outdoor terminal to the top of the semi-conductive heat shrink tubing.

[0062] In summary, it can be seen that the grounding device and method for the outdoor terminal of the high-voltage cable of the EMU in the embodiment of the present invention, based on the original grounding treatment and waterproof treatment, utilizes a semi-conductive tape and a conductive heat shrink tube to solve the ablation problem caused by the accumulation of leakage current at the bottom of the outdoor terminal of the high-voltage cable at the non-grounded end, thereby improving the safety of the original outdoor terminal of the high-voltage cable of the EMU.

[0063] It should be noted that the grounding device and method for the outdoor terminal of the high-voltage cable of the EMU provided by the present invention are mainly used for the grounding treatment of the outdoor terminal of the high-voltage cable of the EMU. The scheme of the present invention is simple to implement and has strong applicability. It can be cited in any grounding treatment scheme for the outdoor terminal of the high-voltage cable of a rail transit train, and a specific scheme can be designed according to the differences between the outdoor terminal of the high-voltage cable and the vehicle.

[0064] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the embodiments of the present invention are described in detail with specific embodiments below.

[0065] Embodiment 1:

[0066] like Figure 1 and Figure 2 As shown:

[0067] First, cut off the shielded copper wire of the outdoor terminal side cable that does not need to lead out the high-voltage cable grounding wire after retaining 50mm, and evenly turn the retained shielded copper wire backwards and press it on the outer sheath of the high-voltage cable;

[0068] Second, on the semi-conductive layer of the cable, starting from 30mm away from the break of the semi-conductive layer, use the semi-conductive tape to wrap the semi-conductive layer and the remaining shielding copper wire, winding it circle by circle until it is basically consistent with the outer diameter of the rubber part at the bottom of the last shed skirt of the outdoor terminal;

[0069] Third, use waterproof tape to wrap the outer sheath of the high-voltage cable under the semi-conductive tape, wrap it circle by circle and gradually reduce the number of circles from the outdoor terminal to the high-voltage cable to form a step-like shape. After wrapping, the overall length of the waterproof tape is 100mm;

[0070] Fourth, use waterproof tape to wrap the semi-conductive layer and semi-conductive steps of the high-voltage cable above the semi-conductive tape, winding it circle by circle until it is basically consistent with the outer diameter of the rubber part at the bottom of the last shed skirt of the outdoor terminal;

[0071] Fifth, wrap a layer of waterproof sealant around the rubber part at the bottom of the last shed skirt of the outdoor terminal of the high-voltage cable;

[0072] Sixth, measure the distance from the half of the rubber part at the bottom of the last umbrella skirt of the outdoor terminal to the bottom of the lowest waterproof tape, insert a semi-conductive heat shrink tube of this length, place it at the half of the rubber part and heat it evenly to shrink it.

[0073] Seventh, measure the distance of the rubber part under the last shed of the outdoor terminal and add 60mm, put in an insulating heat shrink tube of this length, place it under the shed and heat it evenly to shrink it.

[0074] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A grounding device for an outdoor terminal of a high-voltage cable of a train unit, characterized in that: Including semi-conductive tape, semi-conductive heat shrink tubing, waterproof tape, waterproof sealant, insulating heat shrink tubing; The semi-conductive tape is connected to the semi-conductive layer and the shielding copper wire of the high-voltage cable, and overlapped with the semi-conductive heat shrink tube; The semi-conductive heat shrink tube is fixed to the leaking cable gathering position at the bottom of the high-voltage cable outdoor terminal by heat shrinkage; The waterproof tape is wound around the bottom of the outdoor terminal of the high-voltage cable; The waterproof sealant is applied to the bottom of the outdoor terminal of the high-voltage cable; The insulating heat shrinkable tube is overlapped with the waterproof tape and fixed by heat shrinkage.

2. The grounding device for the outdoor terminal of the high-voltage cable of a train set according to claim 1 is characterized in that: The semi-conductive tape is shaped by winding to facilitate overlapping with the outermost semi-conductive heat shrink tube; The semi-conductive heat shrinkable tube is used for heat shrink protection. On the one hand, the leaked cables gathered at the bottom of the outdoor terminal of the high-voltage cable are guided away through the semi-conductive tape and the cable shielding copper wire. On the other hand, it has waterproof, UV-resistant and aging-resistant functions. The waterproof tape is used for waterproofing the bottom of the outdoor terminal of the high-voltage cable and can be shaped by winding; The waterproof sealant is used for waterproofing the bottom of the outdoor terminal of the high-voltage cable; The insulating heat shrinkable tube can provide heat shrink protection and has the functions of being waterproof, insulating, UV-resistant and aging-resistant.

3. A method for grounding the grounding device of the outdoor terminal of the high-voltage cable of a train set according to claim 1 or 2, characterized in that: Includes steps: First, the shielding copper wire of the high-voltage cable is cut off and folded back; Secondly, use semi-conductive tape to wrap the shielding copper wire of the high-voltage cable to handle leakage current; Then use waterproof tape to wrap the semi-conductive layer of the high-voltage cable above the semi-conductive tape and the outer sheath of the high-voltage cable below, and use waterproof sealant to wrap the rubber part at the bottom of the last umbrella skirt of the outdoor terminal of the high-voltage cable for waterproof sealing; Finally, use semi-conductive heat shrink tubing and insulating heat shrink tubing for heat shrink protection.

4. The method for processing high-voltage cable shielding copper wire according to claim 3, characterized in that: The high-voltage cable shielding copper wire needs to be cut according to size and folded back on the outer sheath of the high-voltage cable.

5. The method for processing a semi-conductive tape according to claim 4, characterized in that: The semi-conductive tape needs to be wound around the cable shielding copper wire circle by circle until it is basically consistent with the outer diameter of the rubber part at the bottom of the last shed of the outdoor terminal.

6. The waterproof tape processing method according to claim 5, characterized in that: The waterproof tape needs to be wrapped around the semi-conductive layer of the high-voltage cable above the semi-conductive tape and the outer sheath of the high-voltage cable below, and achieve the effect of being basically consistent with the outer diameter of the rubber part at the bottom of the last umbrella skirt of the outdoor terminal and overlapping the outer sheath of the cable in a stepped manner.

7. The waterproof seal treatment method according to claim 6, characterized in that: The waterproof sealant needs to be wrapped around the rubber part at the bottom of the outdoor terminal umbrella skirt.

8. The method for processing a semi-conductive heat shrink tube according to claim 7, characterized in that: The semi-conductive heat shrink tube needs to be heat-shrink protected from the half of the rubber part at the bottom of the last umbrella skirt of the outdoor terminal to the lowest waterproof belt.

9. The method for processing an insulating heat shrink tube according to claim 8, characterized in that: The insulating heat shrink tube needs to be heat-shrunk from the bottom of the last shed of the outdoor terminal to the top of the semi-conductive heat shrink tube.

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