Medium-voltage single-core power cable with self temperature sensing and adjusting functions
By introducing temperature measurement fibers and cooling channels into the cables, combining water tree insulation layer and monitoring fibers, the problem of untimely heat dissipation of cables in narrow spaces is solved, and stable control and timely monitoring of cable temperature is achieved to prevent failure and theft.
Patent Information
- Application Number
- CN202421856942.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-08-02
AI Technical Summary
The heat dissipation of existing power cables is not timely when laid in a narrow space, resulting in too high temperature and inability to monitor the operation of the cable in time, which can easily cause failure and economic losses, and there is a risk of cable theft.
A medium-voltage single-core power cable with self-temperature sensing and regulation functions is designed, including temperature measurement fiber, cooling channel, water tree insulation layer and monitoring fiber, which is used to monitor temperature and regulate cooling in real time to prevent the generation of water tree branches, and to promptly alarm when the cable is damaged.
It realizes stable control of cable temperature, prevents the formation of water branches, monitors cable integrity in a timely manner, avoids cable failures and thefts, and reduces economic losses.
Smart Images
Figure CN223065915U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power cables, and particularly relates to a medium-voltage single-core power cable with self-temperature sensing and regulation functions. Background Art
[0002] At present, during the process of power construction, the complexity of the cable itself and the narrow installation and operation environment are the main reasons for cable failures. In some cases, it is necessary to lay various types of cables in a narrow space, and the air circulation in the narrow space is poor, resulting in the heat generated during the operation of the cable not being dissipated in time, leading to too high an operating temperature of the cable, thereby weakening the current-carrying capacity of the cable itself, and further causing failures of electrical equipment and cables, resulting in certain economic losses.
[0003] In addition, in the installation and laying environment of power cables, there are densely populated urban areas, suburbs or uninhabited areas. Coupled with the soaring prices of raw materials, which are the main materials for transmitting electrical energy in cables, this has caused the phenomenon of cable theft in the transmission circuits of the power supply network.
[0004] For existing 6 - 35 kV power cable products, the structure is relatively simple. With the changing cable operation environment and higher requirements for cable safety, the existing products can no longer meet the requirements. Coupled with the complex laying locations of cables and the operation environment of the cables themselves, the existing cable structure cannot detect the operation conditions of the cable body. For example, when the temperature of the cable body is relatively high, it can only be discovered after the cable fails and causes certain economic losses, and it is impossible to monitor the power facilities in advance. Content of the Utility Model
[0005] Aiming at the technical problems of the existing power cables with defects, the utility model provides a medium-voltage single-core power cable with self-temperature sensing and regulation functions. It is equipped with a temperature-measuring optical fiber and a cooling channel to ensure that the operating temperature of the cable always remains stable; the anti-water tree insulation layer and the semi-conductive water-resistant tape layer in the cable structure can fully isolate the water vapor generated by the alternating heat and cold, thereby preventing the generation of water trees; in addition, the structure is also provided with a monitoring optical fiber for monitoring the integrity of the cable line, which can prevent cable theft or be monitored in time when the cable is damaged artificially or by the environment.
[0006] The technical solution provided by the present utility model is: a medium-voltage single-core power cable with self-temperature sensing and adjustment functions, including a conductor, a conductor shielding layer is coated on the outside of the conductor, a water-tree-resistant insulating layer is arranged outside the conductor shielding layer, an insulating shielding layer is arranged outside the water-tree-resistant insulating layer, and a semi-conductive water-blocking tape layer is arranged outside the insulating shielding layer; a metal wire shielding layer and a plurality of temperature-measuring optical fibers are arranged outside the semi-conductive water-blocking tape layer, the metal wire shielding layer is composed of metal wires, and the metal wires constituting the metal wire shielding layer and the plurality of temperature-measuring optical fibers are uniformly distributed outside the semi-conductive water-blocking tape layer in a coiled manner; a counter-wound copper tape layer is arranged outside the metal wire shielding layer and the temperature-measuring optical fibers, a first double-sided water-blocking tape layer is arranged outside the counter-wound copper tape layer, a first inner sheath layer is arranged outside the first double-sided water-blocking tape layer, a cooling layer is arranged outside the first inner sheath layer, the cooling layer includes a plurality of cooling channels uniformly distributed along the circumferential direction, a cooling medium flows in the cooling channels, a second double-sided water-blocking tape layer is arranged outside the cooling layer, and a second inner sheath layer is arranged outside the second double-sided water-blocking tape layer; a metal wire armor layer and a plurality of monitoring optical fibers are arranged outside the second inner sheath layer, the metal wire armor layer is composed of metal wires, and the metal wires constituting the metal wire armor layer and the plurality of monitoring optical fibers are uniformly distributed outside the second inner sheath layer in a coiled manner; a tape layer is arranged outside the metal wire armor layer, and an outer sheath layer is arranged outside the tape layer.
[0007] Optionally, the semi-conductive water-blocking tape layer uses a 0.3-mm semi-conductive water-blocking tape.
[0008] Optionally, the diameter of the temperature-measuring optical fiber is the same as the diameter of the metal wire constituting the metal wire shielding layer.
[0009] Optionally, the number of the temperature-measuring optical fibers is not less than 3.
[0010] Optionally, the cooling channel is composed of an aluminum alloy hollow tube.
[0011] Optionally, the metal wires constituting the metal wire armor layer are made of aluminum wires or stainless steel wires.
[0012] Optionally, when the metal wires constituting the metal wire armor layer are made of stainless steel wires, a longitudinal winding steel tape layer is arranged between the metal wire armor layer and the tape layer.
[0013] Optionally, a nylon sheath layer is arranged outside the outer sheath layer.
[0014] Beneficial effects
[0015] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects: Aiming at the technical problem of defects existing in the existing power cables, the present utility model is equipped with a temperature-measuring optical fiber and a cooling channel to ensure that the operating temperature of the cable always remains stable; the water-tree resistant insulation layer and the semi-conductive water-resistant tape layer in the cable structure can fully isolate the water vapor generated by the alternating heat and cold, thereby preventing the generation of water trees; and, a monitoring optical fiber for monitoring the integrity of the cable line is also provided in the structure, which can prevent cable theft or be timely monitored when the cable is damaged artificially or by the environment. Description of the Drawings
[0016] Figure 1 It is a schematic structural diagram of a medium-voltage single-core power cable with self-temperature sensing and adjustment functions proposed in an embodiment of the present utility model. Detailed Embodiments
[0017] To further understand the content of the present utility model, the present utility model will be described in detail in combination with the drawings and embodiments.
[0018] The following further elaborates on the present application in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are merely for explaining the relevant utility model and do not limit the utility model. Additionally, it should be noted that for ease of description, only the parts related to the utility model are shown in the drawings. The terms "first", "second", etc. used in the present utility model are set for the convenience of describing the technical solution of the present utility model and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present utility model. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions without contradiction or conflict, and all are within the scope of protection required by the present utility model.
[0019] Embodiment 1
[0020] Combined with the attached Figure 1 drawings, this embodiment proposes a medium-voltage single-core power cable with self-temperature sensing and regulation functions, including a conductor 1, a conductor shielding layer 2 is coated on the outside of the conductor 1, a water-tree resistant insulation layer 3 is arranged outside the conductor shielding layer 2, an insulation shielding layer 4 is arranged outside the water-tree resistant insulation layer 3, and a semi-conductive water-resistant tape layer 6 is arranged outside the insulation shielding layer 4.
[0021] A metal wire shielding layer 7 and several temperature-measuring optical fibers 5 are arranged outside the semi-conductive water-resistant tape layer 6. The metal wire shielding layer 7 is composed of metal wires. The metal wires constituting the metal wire shielding layer 7 and several temperature-measuring optical fibers 5 are evenly distributed outside the semi-conductive water-resistant tape layer 6 in a coiled manner.
[0022] Outside the wire shielding layer 7 and the temperature-measuring optical fiber 5, there is an anti-twist copper tape layer 8. Outside the anti-twist copper tape layer 8, there is a first double-sided water-blocking tape layer 9. Outside the first double-sided water-blocking tape layer 9, there is a first inner sheath layer 10. Outside the first inner sheath layer 10, there is a cooling layer. The cooling layer includes a plurality of cooling channels 11 evenly distributed in the circumferential direction. A cooling medium flows through the cooling channels 11. Outside the cooling layer, there is a second double-sided water-blocking tape layer 12. Outside the second double-sided water-blocking tape layer 12, there is a second inner sheath layer 13.
[0023] Outside the second inner sheath layer 13, there is a wire armor layer 14 and a plurality of monitoring optical fibers 19. The wire armor layer 14 is composed of wires. The wires forming the wire armor layer 14 and the plurality of monitoring optical fibers 19 are evenly distributed outside the second inner sheath layer 13 in a coiled manner. Outside the wire armor layer 14, there is a tape layer 16. Outside the tape layer 16, there is an outer sheath layer 17.
[0024] The medium-voltage single-core power cable with self-temperature sensing and regulation functions in this embodiment is of a single-core structure. An anti-water tree insulation layer 3 is provided outside the conductor shielding layer 2. The anti-water tree insulation layer 3 mainly uses anti-water tree insulating material. It can be imagined that heat will be generated during the operation of the cable. At the same time, due to the complex and narrow laying environment of the cable, the heat cannot be dissipated in time, resulting in a relatively high temperature of the cable itself. Coupled with the temperature-measuring optical fiber 5 and the cooling channels 11 in this design, it is easy to cause sudden cooling of the cable to form water vapor. Therefore, this embodiment is provided with an anti-water tree insulation layer 3, which can inhibit the occurrence of water tree phenomenon, reduce the risk of the cable being broken down by water tree, and play a role in protecting the insulation.
[0025] In this embodiment, a semi-conductive water-blocking tape layer 6 is provided outside the insulation shielding layer 4, and its function is also to prevent water vapor from invading. In a preferred embodiment, the semi-conductive water-blocking tape layer 6 is composed of a 0.3-mm semi-conductive water-blocking tape.
[0026] Outside the semi-conductive water-blocking tape layer 6, there are also a wire shielding layer 7, a temperature-measuring optical fiber 5, and a cooling layer. Among them, the main function of the wire shielding layer 7 is to conduct short-circuit current and shield. The cooling layer includes a plurality of cooling channels 11 evenly distributed in the circumferential direction. A cooling medium flows through the cooling channels 11. The temperature-measuring optical fiber 5 and the wires forming the wire shielding layer 7 are evenly and neatly distributed outside the semi-conductive water-blocking tape layer 6 in a coiled manner. In an alternative embodiment, the wires forming the wire shielding layer 7 can be copper wires, and the wire shielding layer 7 has a better ability to carry short-circuit current than a conventional metal tape shielding layer. During the operation of the cable, according to the temperature measured by the temperature-measuring optical fiber 5, and then fed back to the flow regulating device related to the cooling channels 11, the flow rate of the cooling medium in the cooling channels 11 can be adjusted according to the temperature.
[0027] For the temperature-measuring optical fiber 5, in a more preferred embodiment, its diameter should be the same as the diameter of the metal wire selected for the metal wire shielding layer 7, and the number of strands should be not less than 3, and they should be evenly distributed circumferentially. For example, when designing 3 temperature-measuring optical fibers 5, they can be interspersed and distributed in the metal wires of the metal shielding layer at intervals of 120°, so as to fully collect the temperature during the operation of the cable. The setting of the temperature-measuring optical fiber 5 can monitor the operating temperature of the cable, avoid power failures caused by excessive cable load due to high temperature. At the same time, it can also detect the integrity of the cable to avoid cable theft and economic losses.
[0028] For the cooling channel 11, the cooling medium flowing inside can take away the heat generated during the operation of the cable, thus avoiding the failure of cable breakdown caused by excessive heat generation and untimely heat dissipation. The material of the cooling channel 11 can be selected as an aluminum alloy hollow tube with relatively high toughness. Its diameter should fully consider the cable operating environment and load conditions. When the environment is narrow and the load is large, the diameter of the cooling channel 11 should be designed larger, so that more cooling medium can pass through and carry more heat, thereby achieving a better cooling effect on the inside of the cable.
[0029] The metal wire armor layer 14 in this embodiment is also composed of metal wires. The material of the metal wires can be selected from one of aluminum wires and stainless steel wires. Similar to the temperature-measuring optical fiber 5, the monitoring optical fiber 19 can be interspersed and distributed in the metal wires of the metal wire armor layer 14, which is used to monitor the integrity of the cable line and play an alarm role when the cable is damaged or stolen.
[0030] In this embodiment, a first inner sheath layer 10, a second inner sheath layer 13, and an outer sheath layer 17 are also provided. The material selection of these structural layers should fully consider the cable usage environment. For example, in a humid and rainy environment, polyethylene materials should be selected.
[0031] In other embodiments, when the construction environment is harsh, a nylon sheath layer 18 can also be provided on the surface of the outer sheath layer 17. The nylon sheath layer 18 has the properties of being smooth, hard, and wear-resistant, and can play a role in protecting the outer sheath of the cable during rough and violent construction.
[0032] Combined with the above description, in view of the technical problems of the existing power cables having defects, the medium-voltage single-core power cable with self-temperature sensing and regulation functions in this embodiment has a temperature-measuring optical fiber 5 and a cooling channel 11 to ensure that the operating temperature of the cable always remains stable; the anti-water tree insulation layer 3 and the semi-conductive water-blocking layer 6 in the cable structure can fully isolate the water vapor generated by the cold and heat alternation, thereby preventing the generation of water trees; and, the monitoring optical fiber 19 for monitoring the integrity of the cable line is also provided in the structure, which can prevent cable theft or be timely monitored when the cable is damaged by humans or the environment.
[0033] The above has schematically described the present utility model and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design, without creative efforts, structural manners and embodiments similar to the technical solution without departing from the gist of the creation of the present utility model, they shall fall within the protection scope of the present utility model.
Claims
1. A medium-voltage single-core power cable with self-temperature sensing and regulation functions, characterized in that, It includes a conductor (1), with a conductor shielding layer (2) coated on the outside of the conductor (1), a water tree resistant insulating layer (3) arranged outside the conductor shielding layer (2), an insulating shielding layer (4) arranged outside the water tree resistant insulating layer (3), and a semiconductive water resistant tape layer (6) arranged outside the insulating shielding layer (4); A metal wire shielding layer (7) and several temperature measuring optical fibers (5) are arranged outside the semiconductive water resistant tape layer (6). The metal wire shielding layer (7) is composed of metal wires. The metal wires constituting the metal wire shielding layer (7) and the several temperature measuring optical fibers (5) are evenly distributed outside the semiconductive water resistant tape layer (6) in a coiled manner; A counter-wound copper tape layer (8) is arranged outside the metal wire shielding layer (7) and the temperature measuring optical fibers (5). A first double-sided water resistant tape layer (9) is arranged outside the counter-wound copper tape layer (8). A first inner sheath layer (10) is arranged outside the first double-sided water resistant tape layer (9). A cooling layer is arranged outside the first inner sheath layer (10). The cooling layer includes several cooling channels (11) evenly distributed in the circumferential direction. A cooling medium flows through the cooling channels (11). A second double-sided water resistant tape layer (12) is arranged outside the cooling layer. A second inner sheath layer (13) is arranged outside the second double-sided water resistant tape layer (12); A metal wire armor layer (14) and several monitoring optical fibers (19) are arranged outside the second inner sheath layer (13). The metal wire armor layer (14) is composed of metal wires. The metal wires constituting the metal wire armor layer (14) and the several monitoring optical fibers (19) are evenly distributed outside the second inner sheath layer (13) in a coiled manner; A tape layer (16) is arranged outside the metal wire armor layer (14). An outer sheath layer (17) is arranged outside the tape layer (16).
2. The medium-voltage single-core power cable with self-temperature sensing and regulating function according to claim 1, characterized in that, The semiconductive water resistant tape layer (6) uses a semiconductive water resistant tape with a thickness of 0.3 mm.
3. A medium-voltage single-core power cable with self-temperature sensing and regulation functions according to claim 1, characterized in that, The diameter of the temperature measuring optical fiber (5) is the same as the diameter of the metal wires constituting the metal wire shielding layer (7).
4. A medium-voltage single-core power cable with self-temperature sensing and regulation functions according to claim 1, characterized in that, The number of the temperature measuring optical fibers (5) is not less than 3.
5. A medium-voltage single-core power cable with self-temperature sensing and regulation functions according to claim 1, characterized in that, The cooling channels (11) are composed of aluminum alloy hollow tubes.
6. The medium-voltage single-core power cable with self-temperature sensing and regulating function according to claim 1, characterized in that, The metal wires constituting the metal wire armor layer (14) use aluminum wires or stainless steel wires.
7. A medium-voltage single-core power cable with a self-temperature sensing and regulating function according to claim 1, characterized in that, When the metal wires constituting the metal wire armor layer (14) use stainless steel wires, a straight-wound steel tape layer (15) is arranged between the metal wire armor layer (14) and the tape layer (16).
8. A medium-voltage single-core power cable with a self-temperature sensing and regulating function according to any one of claims 1-7, characterized in that, A nylon sheath layer (18) is arranged outside the outer sheath layer (17).