50KV-66KV crosslinked polyethylene insulated A-class power cable

Abstract

The utility model relates to the field of power cables, and discloses a 50KV-66KV crosslinked polyethylene insulated class-A power cable, which comprises a conductor, the outer wall of the conductor is fixedly connected with a shielding mechanism, the shielding mechanism comprises a conductor shielding layer, an insulating layer and a metal shielding layer, the outer wall of the shielding mechanism is provided with a heat dissipation mechanism, and the heat dissipation mechanism is fixedly connected with the conductor shielding layer. The outer wall of the shielding mechanism is provided with a fireproof filler, and the outer wall of the fireproof filler is fixedly connected with a ceramic fireproof layer. Compared with most existing 50KV-66KV cross-linked polyethylene insulated class-A power cables, the 50KV-66KV cross-linked polyethylene insulated class-A power cable has the advantages that the outer layer is wrapped by the cross-linked polyethylene, so that the heat resistance of the cable can be improved, and the cable can be ensured to carry out power transmission safely at high temperature; meanwhile, the fireproof material is filled in the cable and the ceramic fireproof layer is arranged, and the ceramic fireproof layer can quickly form a hard ceramic shell in case of fire, so that the damage of the cable in a fire scene can be delayed, and time is gained for rescue and escape in the fire scene.

Description

Technical Field

[0001] The utility model relates to the field of power cables, in particular to a 50KV-66KV cross-linked polyethylene insulated Class A power cable. Background Art

[0002] Power cables are cables used to transmit and distribute high-power electrical energy in power systems. Cross-linked power cables are an important type of power cables. The insulation layer uses cross-linked polyethylene material, which significantly improves the performance of the cable.

[0003] Traditional partially cross-linked polyethylene insulated power cables cannot withstand high temperatures. When the temperature inside the cable is too high and cannot be dissipated in time, it will cause arc burning, which will then cause an explosion. In addition, some cables have poor fire resistance. When encountering a fire source, they will burn and spread rapidly, causing power outages and causing greater harm to the fire scene. Therefore, a new solution is needed to solve this problem.

[0004] Therefore, those skilled in the art provide a 50KV-66KV cross-linked polyethylene insulated Class A power cable to solve the problems raised in the above background technology. Utility Model Content

[0005] The purpose of the present utility model is to solve the shortcomings existing in the prior art, and a 50KV-66KV cross-linked polyethylene insulated Class A power cable is proposed. Compared with traditional power cables, the power cable is provided with a heat dissipation mechanism. By arranging a heat-conducting rod in the middle of the three-strand core, the heat generated by the conductor is conducted to the heat-conducting rod, and then conducted to the heat-conducting frame through the heat-conducting rod and dissipated through the protective layer, which can reduce the temperature inside the cable more quickly. At the same time, a cross-linked polyethylene wrapped outer layer is provided to improve the heat resistance of the cable and ensure that the cable can safely transmit power at high temperatures. Refractory material is filled in the cable and a ceramic refractory layer is provided. The ceramic refractory layer will quickly form a hard ceramic shell when encountering fire. The ceramic shell is fire-resistant and isolates most of the heat of the flame, which can delay damage to the cable at the fire scene and buy time for rescue and escape at the fire scene.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A 50KV-66KV cross-linked polyethylene insulated Class A power cable, comprising a conductor, characterized in that: the outer wall of the conductor is fixedly connected to a shielding mechanism, the shielding mechanism comprises a conductor shielding layer, an insulating layer and a metal shielding layer, the outer wall of the shielding mechanism is provided with a heat dissipation mechanism, the heat dissipation mechanism comprises a plurality of support frames, the inner wall of the support frame is fixedly connected to a plurality of support rods, a heat-conducting rod is provided inside the support frame, the heat-conducting rod is located at the center of the support frame, the outer wall of the heat-conducting rod is fixedly connected to a plurality of heat-conducting frames, the outer wall of the shielding mechanism is provided with a refractory filler, the outer wall of the refractory filler is fixedly connected to a ceramic refractory layer, the outer wall of the ceramic refractory layer is fixedly connected to a steel wire armor layer, and the outer wall of the steel wire armor layer is fixedly connected to a cross-linked polyethylene wrapped outer layer.

[0008] Through the above technical solution, the design of the 50KV-66KV cross-linked polyethylene insulated Class A power cable can make the cable more fire-resistant and high-temperature resistant. The thermal conductivity system dissipates heat from the inside of the cable more quickly, reducing the possibility of hidden dangers caused by excessive temperature inside the cable and improving the safety of the power system.

[0009] Furthermore, the insulating layer is fixed to the outer wall of the conductor shielding layer, and the metal shielding layer is fixed to the outer wall of the insulating layer;

[0010] Through the above technical solution, by providing a shielding mechanism, the conductor is isolated and protected from external electrical interference, thereby improving the safety performance of the cable.

[0011] Furthermore, the insulating layer is made of cross-linked polyethylene;

[0012] Through the above technical solution, cross-linked polyethylene refers to polyethylene molecules that undergo cross-linking reactions through physical or chemical methods to form a three-dimensional network structure. Cross-linked polyethylene as an insulating layer can enhance the heat resistance and insulation performance of the cable.

[0013] Furthermore, the material of the refractory filler is mica;

[0014] Through the above technical solution, mica has good high temperature resistance and electrical insulation properties, which can enhance the fire resistance of the cable.

[0015] Furthermore, a plurality of conductors are fixedly connected inside the refractory filler;

[0016] Through the above technical solution, by providing multiple conductors, the conductor surface area can be increased, the energy loss caused by the current skin effect can be reduced, and the flexibility of the cable can be improved.

[0017] Furthermore, the heat conducting rod and the heat conducting frame are made of aluminum alloy;

[0018] Through the above technical solution, the aluminum alloy bulk material is light in weight and has good thermal performance, which can dissipate heat inside the cable while reducing the load-bearing pressure of the cable.

[0019] Furthermore, the material of the steel wire armor layer is low carbon steel;

[0020] Through the above technical solution, low-carbon steel has better hardness and strength, which enables the cable to withstand stronger mechanical forces and improves the safety of the cable.

[0021] Furthermore, the outer wall of the cross-linked polyethylene outer layer is alternately provided with a plurality of water guide grooves and convex strips;

[0022] Through the above technical solution, by setting up a water guide groove, it plays a role in guiding water when there is a large amount of water on the outer wall of the cable, preventing water from penetrating into the interior of the cable and causing safety hazards. The provision of convex strips can improve the wear resistance of the cable.

[0023] The utility model has the following beneficial effects:

[0024] 1. The utility model proposes a 50KV-66KV cross-linked polyethylene insulated Class A power cable. Compared with most existing power cables, this power cable is equipped with a heat dissipation mechanism. By arranging a heat-conducting rod in the middle of the three-strand core, the heat generated by the conductor is transferred to the heat-conducting rod, and then transferred to the heat-conducting frame through the protective layer. This can quickly reduce the temperature inside the cable, reduce the possibility of explosion accidents caused by excessive temperature inside the cable, extend the service life of the cable, and protect the safety of the power system.

[0025] 2. The utility model proposes a 50KV-66KV cross-linked polyethylene insulated Class A power cable. Compared with most existing power cables, this power cable can improve the heat resistance of the cable by providing a cross-linked polyethylene wrapped outer layer, ensuring the safe power transmission of the cable at high temperature. At the same time, the interior of the cable is filled with refractory materials and a ceramic refractory layer is provided. The ceramic refractory layer will quickly form a hard ceramic shell when encountering fire. The ceramic shell is fire-resistant and isolates most of the heat of the flame, which can delay damage to the cable at the fire scene and buy time for rescue and escape at the fire scene. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of a 50KV-66KV cross-linked polyethylene insulated Class A power cable proposed in the utility model;

[0027] Figure 2 This is a cross-sectional view of a 50KV-66KV cross-linked polyethylene insulated Class A power cable proposed in the present invention;

[0028] Figure 3This is a conductor cross-sectional view of a 50KV-66KV cross-linked polyethylene insulated Class A power cable proposed in the present invention;

[0029] Figure 4 This is a schematic diagram of the internal structure of a 50KV-66KV cross-linked polyethylene insulated Class A power cable proposed in the utility model;

[0030] Figure 5 This is a structural schematic diagram of a heat dissipation mechanism for a 50KV-66KV cross-linked polyethylene insulated Class A power cable proposed in the present invention.

[0031] Legend:

[0032] 1. Conductor; 2. Shielding mechanism; 201. Conductor shielding layer; 202. Insulation layer; 203. Metal shielding layer; 3. Heat dissipation mechanism; 301. Heat-conducting rod; 302. Heat-conducting frame; 303. Support frame; 304. Support rod; 4. Refractory filler; 5. Ceramic refractory layer; 6. Steel wire armor layer; 7. Cross-linked polyethylene outer layer; 8. Water guide groove; 9. Raised strip. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Reference Figure 1-5 , an embodiment provided by the utility model:

[0035] A 50KV-66KV cross-linked polyethylene insulated Class A power cable, comprising a conductor 1, the outer wall of the conductor 1 being fixedly connected to a shielding mechanism 2, the shielding mechanism 2 comprising a conductor shielding layer 201, an insulating layer 202 and a metal shielding layer 203, the outer wall of the shielding mechanism 2 being provided with a heat dissipation mechanism 3, the heat dissipation mechanism 3 comprising a plurality of support frames 303, the inner wall of the support frame 303 being fixedly connected to a plurality of support rods 304, the interior of the support frame 303 being provided with a heat-conducting rod 301, the heat-conducting rod 301 being located at the center of the support frame 303, the outer wall of the heat-conducting rod 301 being fixedly connected to a plurality of heat-conducting frames 302, the outer wall of the shielding mechanism 2 being provided with a refractory filler 4, the outer wall of the refractory filler 4 being fixedly connected to a ceramic refractory layer 5, the outer wall of the ceramic refractory layer 5 being fixedly connected to a steel wire armor layer 6, and the outer wall of the steel wire armor layer 6 being fixedly connected to a cross-linked polyethylene wrapped outer layer 7.

[0036] The design of this 50KV-66KV cross-linked polyethylene insulated Class A power cable makes the cable more fire-resistant and high-temperature resistant. The thermal conductivity system dissipates heat from the inside of the cable more quickly, reducing the possibility of hidden dangers caused by excessive temperature inside the cable and improving the safety of the power system.

[0037] The insulating layer 202 is fixed to the outer wall of the conductor shielding layer 201, and the metal shielding layer 203 is fixed to the outer wall of the insulating layer 202. By setting the shielding mechanism 2, the conductor 1 is isolated and protected from external electrical interference, thereby improving the safety performance of the cable. The material of the insulating layer 202 is cross-linked polyethylene. Cross-linked polyethylene refers to a three-dimensional network structure formed by a cross-linking reaction inside the polyethylene molecules by physical or chemical methods. Cross-linked polyethylene as the insulating layer 202 can enhance the heat resistance and insulation performance of the cable. The material of the refractory filler 4 is mica. Mica has good high temperature resistance and electrical insulation, which can enhance the fire resistance of the cable. A plurality of conductors 1 are fixedly connected to the interior of the refractory filler 4. By setting a plurality of conductors 1 It can increase the surface area of ​​the conductor 1, reduce the energy loss caused by the skin effect of current, and improve the flexibility of the cable. The material of the heat-conducting rod 301 and the heat-conducting frame 302 is aluminum alloy. The aluminum alloy has a light weight and good thermal performance. It reduces the load-bearing pressure of the cable while dissipating heat inside the cable. The material of the steel wire armor layer 6 is low-carbon steel. Low-carbon steel has good hardness and strength, so that the cable can withstand stronger mechanical force and improve the safety of the cable. The outer wall of the cross-linked polyethylene wrapped outer layer 7 is alternately distributed with multiple water guide grooves 8 and convex strips 9. By setting the water guide grooves 8, it plays a role in guiding water when there is a large amount of water on the outer wall of the cable, preventing water from penetrating into the inside of the cable and causing safety hazards. The provision of convex strips 9 can improve the wear resistance of the cable.

[0038] Working principle:

[0039] The conductor shielding layer 201 arranged on the outside of the conductor 1 reduces local discharge between the conductor 1 and the insulating layer 202. The metal shielding layer 203 limits the electric field to the inside of the cable, protecting the cable from external electrical interference and personal safety. The insulating layer 202 protects the conductor from the outside world. A heat dissipation mechanism 3 is arranged on the outside of the conductor 1, and a heat-conducting rod 301 is arranged in the middle of the three-strand wire core to conduct the heat generated by the conductor 1 to the heat-conducting rod 301. The heat-conducting rod 301 conducts the heat to the heat-conducting frame 302, and finally dissipates it through the protective layer, which can accelerate the heat dissipation of the conductor 1. The ceramic refractory layer 5 arranged in the protective layer forms a ceramic shell when encountering fire. The ceramic shell is heat-resistant and impact-resistant, and can isolate part of the flame heat, thereby protecting the cable. The cross-linked polyethylene wrapped outer layer 7 of the cable enables the cable to withstand higher operating temperatures, withstand greater pressure and tension, and ensure the safety of the cable. The water guide groove 8 arranged on the cross-linked polyethylene wrapped outer layer 7 plays a role in guiding water flow, and the convex strip 9 plays a role in wear resistance.

[0040] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A 50KV-66KV cross-linked polyethylene insulated Class A power cable, comprising a conductor (1), characterized in that: The outer wall of the conductor (1) is fixedly connected to a shielding mechanism (2), the shielding mechanism (2) comprising a conductor shielding layer (201), an insulating layer (202) and a metal shielding layer (203), the outer wall of the shielding mechanism (2) is provided with a heat dissipation mechanism (3), the heat dissipation mechanism (3) comprises a plurality of support frames (303), the inner wall of the support frame (303) is fixedly connected to a plurality of support rods (304), and the interior of the support frame (303) is provided with a heat conducting rod (301). The heat-conducting rod (301) is located at the center of the support frame (303), the outer wall of the heat-conducting rod (301) is fixedly connected to a plurality of heat-conducting frames (302), the outer wall of the shielding mechanism (2) is provided with a refractory filler (4), the outer wall of the refractory filler (4) is fixedly connected to a ceramic refractory layer (5), the outer wall of the ceramic refractory layer (5) is fixedly connected to a steel wire armor layer (6), and the outer wall of the steel wire armor layer (6) is fixedly connected to a cross-linked polyethylene wrapped outer layer (7).

2. A 50KV-66KV cross-linked polyethylene insulated Class A power cable according to claim 1, characterized in that: The insulating layer (202) is fixed to the outer wall of the conductor shielding layer (201), and the metal shielding layer (203) is fixed to the outer wall of the insulating layer (202).

3. The 50KV-66KV cross-linked polyethylene insulated Class A power cable according to claim 1, characterized in that: The insulating layer (202) is made of cross-linked polyethylene.

4. The 50KV-66KV cross-linked polyethylene insulated Class A power cable according to claim 1, characterized in that: The material of the refractory filler (4) is mica.

5. The 50KV-66KV cross-linked polyethylene insulated Class A power cable according to claim 1, characterized in that: A plurality of conductors (1) are fixedly connected inside the refractory filler (4).

6. The 50KV-66KV cross-linked polyethylene insulated Class A power cable according to claim 1, characterized in that: The heat conducting rod (301) and the heat conducting frame (302) are made of aluminum alloy.

7. The 50KV-66KV cross-linked polyethylene insulated Class A power cable according to claim 1, characterized in that: The material of the steel wire armor layer (6) is low carbon steel.

8. The 50KV-66KV cross-linked polyethylene insulated Class A power cable according to claim 1, characterized in that: The outer wall of the cross-linked polyethylene wrapped outer layer (7) is alternately provided with a plurality of water guide grooves (8) and convex strips (9).

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