Cable outdoor terminal

Abstract

The invention discloses a cable outdoor terminal which comprises a top cover, a wire outlet rod, a sleeve, an installation fixing seat, a tail pipe and a cable. The wire outlet rod is installed above the top cover, the top cover is fixedly installed at the upper end of the sleeve, the installation fixing base is fixedly installed at the lower end of the sleeve, and the tail pipe is arranged on the cable in a sleeving mode and arranged below the installation fixing base. The sleeve, the top cover and the installation fixing base form a sealed cavity, the sealed cavity is filled with insulating oil, and the cable penetrates through the installation fixing base and the sealed cavity to be fixedly connected with the lower end of the wire outlet rod. The cable is also sleeved with a stress cone in the sleeve; and the sleeve is coated with a self-repairing insulating layer. When the casing pipe cracks, the microcapsules are broken to release the repairing agent, damage is automatically repaired, the reliability and durability of the insulating material are enhanced, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cable accessories, and more specifically, to an outdoor cable terminal. Background Art

[0002] The outdoor terminal of cable accessories is an indispensable part of the cable system, mainly used for connecting cables to overhead lines or other equipment. During long-term operation, existing outdoor terminals are easily affected by environmental factors (such as ultraviolet rays, rain, temperature changes, etc.), resulting in the aging and cracking of insulating materials, which in turn leads to partial discharge or even breakdown, seriously affecting the safe operation of the power system. Currently, the conventional solution is to perform regular maintenance or replace the terminal, but this method is costly, time-consuming, and cannot fundamentally solve the problem.

[0003] The purpose of the present invention is to provide an outdoor cable terminal that can automatically repair when there are minor damages to the insulating material, extend the service life of the terminal, reduce maintenance costs, and improve the reliability of the power system. Summary of the Invention

[0004] The purpose of the present invention is to provide an outdoor cable terminal to overcome the above-mentioned defects in the prior art.

[0005] The technical solution to achieve the purpose of the present invention is: an outdoor cable terminal, including a top cover, a lead rod, a bushing, a mounting and fixing seat, a tail pipe, and a cable; the lead rod is installed above the top cover, the top cover is fixedly installed at the upper end of the bushing, the mounting and fixing seat is fixedly installed at the lower end of the bushing, the tail pipe is sleeved on the cable and is arranged below the mounting and fixing seat; the bushing and the top cover and the mounting and fixing seat form a sealed chamber filled with insulating oil, and the cable passes through the mounting and fixing seat and the sealed chamber and is fixedly connected to the lower end of the lead rod; a stress cone is also sleeved on the cable inside the bushing; the bushing is coated with a self-repairing insulating layer.

[0006] As a preferred embodiment, the self-repairing insulating layer includes an insulating polymer matrix and microcapsules, the microcapsules are located inside the insulating polymer matrix, and the microcapsules are filled with a repair agent.

[0007] As a preferred embodiment, the microcapsules are spherical or ellipsoidal, the wall material of the microcapsules is polyurethane or a similar polymer material; the bushing is made of epoxy resin or silicone rubber material, and the repair agent is epoxy resin or a low-viscosity siloxane monomer.

[0008] As a preferred embodiment, the sleeve is fixedly connected to the installation fixing base through the fixing base fitting, and multiple waterproof sealing rings are provided at the connection between the fixing base fitting and the fixing base; the sleeve is fixedly connected to the top cover through the top cover fitting, and multiple waterproof sealing rings are arranged between the connection of the top cover fitting and the top cover.

[0009] As a preferred embodiment, a sealing groove is reserved at the connection of the fixing base fitting and the top cover fitting. Silicone grease is applied in the sealing groove to fill the gaps around the compressed sealing ring. The sealing ring is installed in the sealing groove after applying the silicone grease, and the gaps are eliminated by the extrusion of the fixing base fitting and the top cover fitting respectively to ensure the sealing of the terminal.

[0010] As a preferred embodiment, a sealing cap is further installed above the connection port between the installation fixing base and the cable, and an insulating self-adhesive tape is wound around the outside of the sealing cap.

[0011] As a preferred embodiment, the sealing cap is made of nitrile rubber.

[0012] As a preferred embodiment, heat sinks are welded or bolted to the inner wall of the sleeve.

[0013] As a preferred embodiment, the inside of the sleeve further includes an internal temperature sensor, a humidity sensor, a vibration sensor, a partial discharge sensor, and a wireless communication module. The temperature sensor, the humidity sensor, the vibration sensor, and the partial discharge sensor are electrically connected to the wireless communication module, and the wireless communication module transmits the sensor data to the monitoring center.

[0014] As a preferred embodiment, an outgoing line clamp is further fixedly provided above the outgoing line rod, and a shielding cover is further fixed above the top cover. The shielding cover covers the outside of the top cover and the upper end of the outgoing line rod.

[0015] As a preferred embodiment.

[0016] Adopting the above technical solutions, the present invention has the following beneficial effects:

[0017] (1) The present invention can effectively prevent the influence of the external environment on the internal cable and connection components, improve the waterproof and moisture-proof performance of the equipment, and the insulating oil helps with heat dissipation, prolonging the service life of the equipment; the design of the stress cone can evenly distribute the electric field strength at the end of the cable, reducing the possibility of partial discharge, thereby protecting the cable terminal from electric field damage and improving the operation safety.

[0018] (2) When cracks appear in the materials of the present invention, the microcapsules rupture and release the repair agent, automatically repairing the damage, enhancing the reliability and durability of the insulating materials, and reducing the maintenance cost.

[0019] (3) The present invention provides multiple waterproof sealing rings, and multiple sealing measures improve the overall sealing performance of the cable terminal, enhance the waterproof ability, and ensure the stable operation of the equipment.

[0020] (4) A sealing groove is reserved at the connection between the fixed seat fitting and the top cover fitting of the present invention and silicone grease is applied, which not only increases the tightness of the sealing ring but also effectively fills the gaps after compression, further improving the sealing effect.

[0021] (5) The sealing cap of the present invention greatly guarantees the sealing effect at the terminal floor and significantly reduces the probability of terminal oil leakage. The use of the sealing cap also reduces the use of sealing tapes, greatly reducing the overall cost of the product.

[0022] (6) The nitrile rubber of the present invention has good elasticity and anti-aging performance, and can provide long-term reliable sealing guarantee as the sealing cap material.

[0023] (7) During the operation of the cable terminal of the present invention, the conductor connection fitting generates heat due to resistance loss, and the insulating material also generates heat due to dielectric loss. To ensure the safe operation of the cable terminal, a heat dissipation device is installed on the fitting inside the epoxy bushing. The heat dissipation device will transfer the heat generated by the above abnormalities to the outside of the bushing in real time, slowing down the temperature rise inside the bushing. Effectively control the operating temperature of the outdoor terminal of the cable accessory and ensure its long-term stability.

[0024] (8) The present invention fixes the monitoring module inside the terminal and connects the sensor and the wireless communication module. The sensor collects data such as temperature, humidity, vibration, and partial discharge in real time, transmits the data to the central processor for processing through wireless transmission, and sends a warning signal.

[0025] (9) The shielding cover of the present invention can effectively protect the terminal top cover from rainwater, moisture, etc. from invading into the terminal interior from the upper part of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to specific embodiments in conjunction with the drawings, where

[0027] Figure 1 is a cross-sectional view of the present invention;

[0028] Figure 2 is a schematic diagram of the microscopic structure of the self-healing insulating layer of the present invention.

[0029] The reference numerals in the drawings are: 1, top cover; 2, outgoing line rod; 3, bushing; 4, mounting and fixing seat; 5, tail pipe; 6, cable; 7, insulating oil; 8, stress cone; 9, fixing seat fitting; 10, top cover fitting; 11, sealing cap; 12, self-healing insulating layer; 12-1, insulating polymer matrix; 12-2, microcapsule; 12-3, repair agent; 13, heat sink; 14, outgoing line clamp; 15, shielding cover. Detailed implementation manners

[0030] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the drawings in the specification and specific implementation manners.

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0034] In the description of the embodiments of the present invention, it should be understood 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, or the orientation or positional relationship in which the product of the invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention 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 therefore should not be construed as a limitation of the present invention.

[0035] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "coupled" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0036] Embodiment 1

[0037] Specific implementation manner, an outdoor cable terminal, see Figure 1 , including a top cover 1, a lead-out rod 2, a bushing 3, a mounting and fixing seat 4, a tail pipe 5, and a cable 6; the lead-out rod 2 is installed above the top cover 1, and a lead-out clamp 14 is fixedly arranged above the lead-out rod 2; a shielding cover 15 is also fixedly arranged above the top cover 1, and the shielding cover 15 covers the upper ends of the top cover and the lead-out rod 2 on the outside, and the shielding cover 15 is used to prevent external rainwater or water vapor from entering the terminal interior.

[0038] The top cover 1 is fixedly installed at the upper end of the bushing 3, the mounting and fixing seat 4 is fixedly installed at the lower end of the bushing 3, the tail pipe 5 is sleeved on the cable 6 and arranged below the mounting and fixing seat 4; the bushing 3 and the top cover 1 and the mounting and fixing seat 4 form a sealed chamber, the sealed chamber is filled with insulating oil 7, the cable 6 passes through the mounting and fixing seat 4 and the sealed chamber and is fixedly connected to the lower end of the lead-out rod 2; a stress cone 8 is also sleeved on the cable 6 inside the bushing 3, and the stress cone 8 can evenly distribute the electric field intensity at the end of the cable and reduce the possibility of partial discharge.

[0039] Furthermore, see Figure 2 , the bushing 3 is coated with a self-healing insulating layer 12; the self-healing insulating layer 12 is composed of an insulating polymer matrix 12-1 and microcapsules 12-2, the microcapsules 12-2 are filled with a repair agent 12-3, the microcapsules 12-2 are spherical or ellipsoidal, the wall material of the microcapsules 12-2 is polyurethane or a similar polymer material, the bushing 3 is made of epoxy resin or silicone rubber material, and the microcapsules 12-2 with the repair material are uniformly dispersed in the epoxy resin or silicone rubber (with a diameter of 10-50 μm); the wall material of the microcapsules 12-2 is polyurethane or a similar polymer material and has a certain mechanical strength and can maintain integrity in a normal environment. Each microcapsule is filled with a repair agent, and the repair agent is a low-viscosity siloxane or an epoxy resin monomer. The repair agent is released after the microcapsule ruptures and cures through a polycondensation reaction to fill and repair cracks and restore insulation performance.

[0040] Before coating, the sleeve 3 needs to be cleaned to remove oil stains and oxide layers to improve the adhesion of the insulating layer of the sleeve 3; the self-healing insulating material is evenly coated on the outer surface of the sleeve 3 and cured at 80 °C for 2 hours to ensure the tight combination of the insulating layer and the sleeve 3; after curing, it is necessary to check whether the surface of the coating layer is flat, and whether there are bubbles and cracks. When cracks occur in the insulating layer of the sleeve 3 due to environmental or working factors, the cracks will cause the microcapsules to rupture when passing through the microcapsules, and the repair agent inside the microcapsules will flow out immediately and fill the cracks; after the cracks are completely filled, the insulation performance will be restored immediately.

[0041] Furthermore, the sleeve 3 is fixedly connected to the installation fixing base 4 through the fixing base fitting 9, and multiple waterproof sealing rings are provided at the connection between the fixing base fitting 9 and the fixing base 4; the sleeve 3 is fixedly connected to the top cover 1 through the top cover fitting 10, and multiple waterproof sealing rings are arranged between the connection of the top cover fitting 10 and the top cover 1;

[0042] A sealing groove is reserved at the connection of the fixing base fitting 9 and the top cover fitting 10, and silicone grease is applied in the sealing groove to fill the gaps around the compressed sealing ring. The sealing ring is installed in the sealing groove after applying silicone grease, and the gaps are eliminated by the extrusion of the fixing base fitting 9 and the top cover fitting 10 respectively, ensuring the sealing performance of the terminal sleeve, avoiding the leakage of the insulating oil 7, and also preventing the entry of external gases.

[0043] Furthermore, a sealing cap 11 is also installed above the connection port of the installation fixing base 4 and the cable 6, and an insulating self-adhesive tape is wound around the outside of the sealing cap 11; the sealing cap 11 is made of nitrile rubber; nitrile rubber can well prevent swelling with the insulating oil inside the terminal, and its nitrile rubber also has excellent wear resistance and oil resistance, and is cheap. The use of the sealing cap can greatly reduce the probability of terminal oil leakage.

[0044] When installing the outdoor terminal, start from the bottom position of the fixing base 4 and wind a layer of PVC on the outside of the cable 6 to the bottom of the stress cone 8, and then cover the sealing cap 11 on the upper opening of the fixing base 4 to coincide with it; wind an insulating self-adhesive tape around the outside of the sealing cap 11; the sealing cap 11 greatly ensures the sealing effect of the fixing base 4 and greatly reduces the probability of terminal oil leakage. The use of the sealing cap further reduces the use of sealing tapes, greatly reduces the overall cost of the product, and further improves the service life of the terminal.

[0045] Furthermore, heat sinks are welded or bolted to the inner wall of the sleeve 3. During the operation of the cable terminal, the conductor connection fitting generates heat due to resistance loss, and the insulating material also generates heat due to dielectric loss. As the temperature rises, the performance of the insulating material may decline, further exacerbating the dielectric loss, forming a vicious cycle, and may even lead to the breakdown of the insulating layer in severe cases. The heat sink 13 will transfer the heat generated by the above abnormalities to the outside of the sleeve in real time, slowing down the temperature rise inside the sleeve. Effectively control the operating temperature of the outdoor terminal of the cable accessory to ensure its long-term stability. The built-in heat sink can reduce the operating temperature of the terminal, reduce the risk of material aging, and greatly ensure the safety performance of the terminal.

[0046] The fluidity and curing rate of the repair agent 12-3 (such as low-viscosity silicone or epoxy resin monomer) highly depend on temperature. At higher temperatures, the repair agent 12-3 may be more fluid but may accelerate volatilization or change its chemical properties; while at lower temperatures, the repair agent may become too viscous to effectively fill the cracks. The built-in heat sink can control the temperature inside and outside the sleeve 3 within a reasonable temperature range, enabling the self-repairing insulating layer 12 to always be in an appropriate working temperature range, ensuring the stability of the self-repairing insulating layer 12, reducing the maintenance and replacement frequency, and lowering the resource consumption and operation and maintenance costs.

[0047] Furthermore, the inside of the sleeve 3 also includes built-in temperature sensors, humidity sensors, vibration sensors, partial discharge sensors, and a wireless communication module. The temperature sensors, humidity sensors, vibration sensors, and partial discharge sensors are electrically connected to the wireless communication module, and the wireless communication module transmits the sensor data to the monitoring center. The sensors can monitor the terminal status in real time, detect potential faults in a timely manner, and improve the system reliability.

[0048] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A cable outdoor terminal, characterized in that: The invention comprises a top cover (1), a lead-out rod (2), a sleeve (3), a mounting seat (4), a tail pipe (5) and a cable (6); the lead-out rod (2) is mounted above the top cover (1), the top cover (1) is fixedly mounted on the upper end of the sleeve (3), the mounting seat (4) is fixedly mounted on the lower end of the sleeve (3), the tail pipe (5) is sleeved on the cable (6) and arranged below the mounting seat (4); the sleeve (3) and the top cover (1) and the mounting seat (4) form a sealed chamber, the sealed chamber is filled with insulating oil (7), the cable (6) passes through the mounting seat (4) and the sealed chamber and is fixedly connected to the lower end of the lead-out rod (2); the cable (6) is also sleeved with a stress cone (8) in the sleeve (3); and the sleeve (3) is coated with a layer of self-repairing insulating layer (12).

2. According to claim 1, a cable outdoor terminal is characterized in that: The self-healing insulating layer (12) comprises an insulating polymer matrix (12-1) and microcapsules (12-2), wherein the microcapsules are located inside the insulating polymer matrix and are filled with a repairing agent (12-3).

3. According to claim 2, a cable outdoor terminal is characterized in that: The microcapsule (12-2) is spherical or ellipsoidal, and the wall material of the microcapsule (12-2) is polyurethane or similar polymer materials; the sleeve (3) is epoxy resin or silicone rubber material, and the repair agent (12-3) is epoxy resin or low-viscosity siloxane monomer.

4. The cable outdoor terminal according to claim 1, characterized in that: The sleeve (3) is fixedly connected to the mounting seat (4) via a fixing seat fitting (9), and a multi-layer waterproof sealing ring is provided at the connection between the fixing seat fitting (9) and the fixing seat (4); the sleeve (3) is fixedly connected to the top cover (1) via a top cover fitting (10), and a multi-layer waterproof sealing ring is provided between the connection between the top cover fitting (10) and the top cover (1).

5. The cable outdoor terminal according to claim 4, characterized in that: A sealing groove is reserved at the connection between the fixing seat fitting (9) and the top cover fitting (10), and silicone grease is applied in the sealing groove to fill the gap around the sealing ring after compression. The sealing ring is installed in the sealing groove after the silicone grease is applied, and the gap is eliminated by squeezing the fixing seat fitting (9) and the top cover fitting (10) respectively.

6. The cable outdoor terminal according to claim 1, characterized in that: A sealing cap (11) is also installed above the connection port between the installation fixing seat (4) and the cable (6), and a layer of insulating self-adhesive tape is wrapped around the outside of the sealing cap (11).

7. The cable outdoor terminal according to claim 1, characterized in that: The sealing cap (11) is made of nitrile rubber.

8. The cable outdoor terminal according to claim 1, characterized in that: A heat sink (13) is welded or bolted to the inner wall of the sleeve (3).

9. The cable outdoor terminal according to claim 1, characterized in that: The sleeve (3) also includes a built-in temperature sensor, a humidity sensor, a vibration sensor, a partial discharge sensor and a wireless communication module. The temperature sensor, the humidity sensor, the vibration sensor and the partial discharge sensor are electrically connected to the wireless communication module, and the wireless communication module transmits sensor data to a monitoring center.

10. The outdoor cable terminal according to claim 1, characterized in that: A wire outlet clamp (14) is also fixedly provided above the wire outlet rod (2), and a shielding cover (15) is also fixedly provided above the top cover (1), wherein the shielding cover (15) is provided on the outside of the top cover and the upper end of the wire outlet rod (2).

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