1.8 / 3kV wind power cable accessory

Abstract

A 1.8 / 3kV wind power cable accessory comprises a three-finger sleeve, a cold contraction insulation tube and a wiring terminal, the three-finger sleeve is used for a conductor core obtained after a part of a cable is stripped to penetrate through, only the part, with an outer insulation layer stripped, of the cable is inserted into the three-finger sleeve, the cold contraction insulation tube is arranged outside the extended conductor core in a sleeving mode and inserted into a finger sleeve of the three-finger sleeve at the same time, and the wiring terminal is connected with the three-finger sleeve. The three-finger sleeve further comprises a grounding wire which is arranged on a steel armor layer of the part, where only the outer insulating layer is stripped, of the cable, and a fixing mechanism which is used for fixing the grounding wire arranged on the steel armor layer of the cable is inserted into the main body part of the three-finger sleeve. And the fixing mechanism is also assembled with the main body part of the three-finger sleeve. The beneficial effects of the utility model lie in that the grounding wire is fixed on the steel armor layer of the cable through the fixing mechanism, and the fixing mechanism and the three-finger sleeve can be assembled together, so that the movement form of the fixing mechanism can be limited after assembly, and the constraint effect of the fixing mechanism on the grounding wire can be maintained.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation technology, and in particular to a 1.8 / 3kV wind power cable accessory. Background Technology

[0002] Wind power cable accessories are cable connection, protection and support components specifically designed and matched for wind power generation systems to ensure safe and reliable power transmission within the wind turbine and between the wind turbine and the power grid.

[0003] By adding a grounding wire, the electric field in wind power cable accessories is evenly distributed within the insulation layer, avoiding localized high field strength areas. The uniform electric field distribution allows the insulation material to withstand higher voltages without breakdown or partial discharge. Fault current can also be quickly conducted to the ground through the grounding wire, protecting the system from overvoltage impacts and enabling the accessories to withstand higher operating voltages.

[0004] Currently, the existing grounding wire connection method involves attaching the grounding wire to the steel armor layer of the cable, then fixing it with a constant force spring, and finally wrapping PVC tape around the constant force spring for further fixation. The constant force spring is relatively cumbersome to operate, as the user needs to pull the coiled constant force spring into a linear shape and then wrap it around the steel armor layer of the cable. During the wrapping process, it is necessary to maintain tension, that is, to ensure that the grounding wire is tightly attached to the steel armor layer of the cable, and the tape also needs to be properly applied when wrapping it, which makes the operation quite cumbersome. Utility Model Content

[0005] This invention aims to overcome the shortcomings of the prior art by providing a 1.8 / 3kV wind power cable accessory to solve the aforementioned problems.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: This 1.8 / 3kV wind power cable accessory includes a three-finger sleeve, a cold-shrink insulating tube, and a terminal block. The three-finger sleeve is for the conductor core obtained after stripping part of the cable to pass through, and for the part of the cable with only the outer insulation layer stripped to be inserted into it. The cold-shrink insulating tube is sleeved over the extended conductor core and simultaneously inserted into the finger sleeve of the three-finger sleeve. The terminal block is for the electrical end of the conductor core to be inserted into it. It also includes a grounding wire set on the steel armor layer of the part of the cable with only the outer insulation layer stripped. The main body of the three-finger sleeve is fitted with a fixing mechanism for fixing the grounding wire set on the steel armor layer of the cable. The fixing mechanism is also assembled together with the main body of the three-finger sleeve.

[0007] Further improvements include setting the fixing mechanism as a cylindrical component with several abutment protrusions evenly distributed along its circumference on its inner circumference surface. When the cable is inserted into the fixing mechanism, the abutment protrusions will abut against the steel armor layer of the cable, and one of the abutment protrusions will also fix the grounding wire at the same time.

[0008] Further improvements include a socket on the grounding wire for the abutment protrusion to pass through.

[0009] Further improvements include an assembly node on the outer circumference of the main body of the three-finger sleeve, and an assembly component on the fixing mechanism. After the assembly component is inserted into the main body of the three-finger sleeve by the fixing mechanism, it prevents the fixing mechanism from detaching from the main body of the three-finger sleeve by combining with the assembly node.

[0010] Further improvements include the provision of a first guide channel, a second guide channel, and a third guide channel on the outer circumferential surface of the main body of the three-finger sleeve, which guide the assembly component to the assembly node in the assembly direction. The first guide channel has a lower opening on the main body of the three-finger sleeve that guides the assembly component to enter into the first guide channel. The second guide channel connects the first guide channel and the third guide channel, and the third guide channel communicates with the assembly node.

[0011] Further improvements include a first reversing channel on the outer circumferential surface of the main body of the three-finger sleeve, which guides the assembly to move from the first guide channel to the second guide channel in a reversing direction, and a second reversing channel that moves from the second guide channel to the third guide channel.

[0012] Further improvements include a self-locking structure on the assembly that abuts against the outer circumferential surface of the main body of the three-finger sleeve and prevents the fixing mechanism from separating from the three-finger sleeve.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model uses a fixing mechanism to fix the grounding wire to the steel armor layer of the cable. Moreover, the fixing mechanism and the three-finger sleeve can be assembled together. After assembly, the movement of the fixing mechanism can be limited to maintain the constraint effect of the fixing mechanism on the grounding wire.

[0015] 2. The fixing mechanism of this utility model is provided with several abutting protrusions. The abutting protrusions are used to increase the assembly stability of the cable and the fixing mechanism, and also to fix the wires. The form of extrusion deformation can increase the fixing stability.

[0016] 3. The fixing mechanism of this utility model is assembled with the three-finger sleeve through the assembly parts and assembly nodes, which realizes quick and convenient assembly. Furthermore, the assembly parts need to pass through various channels to reach the assembly nodes, and the various channels prolong the escape difficulty. Even if the assembly parts detach from the assembly nodes, the fixing mechanism and the three-finger sleeve will not separate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2This is a partial cross-sectional structural diagram of the present invention;

[0019] Figure 3 This utility model Figure 2 A magnified view of part A in the middle;

[0020] Figure 4 This is an exploded structural diagram of the three-finger sleeve and fixing mechanism of this utility model. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] Referring to the attached diagram: This 1.8 / 3kV wind power cable accessory includes a three-finger sleeve 1, a cold-shrink insulating tube 2, and a terminal block 3. The three-finger sleeve 1 allows the conductor core obtained after stripping a portion of the cable to pass through, and the portion of the cable with only the outer insulation layer stripped to be inserted into it. The cold-shrink insulating tube 2 is fitted over the extended conductor core and simultaneously inserted into the finger sleeves of the three-finger sleeve 1. The terminal block 3 allows the end of the conductor core that has passed through to be inserted into it. It also includes a grounding wire 4 installed on the steel armor layer of the portion of the cable with only the outer insulation layer stripped. A fixing mechanism 5 is inserted into the main body of the three-finger sleeve 1 to fix the grounding wire 4 installed on the steel armor layer of the cable. The fixing mechanism 5 is also assembled together with the main body of the three-finger sleeve 1. The principle of this utility model is that before the cable is inserted into the three-finger sleeve 1, the grounding wire 4 needs to be fixed to the steel armor layer of the cable first. The fixing is achieved by the fixing mechanism 5. After fixing, the fixing mechanism 5 is inserted together with the cable into the three-finger sleeve 1. The fixing mechanism 5 and the three-finger sleeve 1 can also be assembled together. After assembly, the movement of the fixing mechanism 5 can be limited (it cannot move or rotate). At the same time, after the terminal block 3 is installed on the conductor core of the cable, a constraint force that prevents the cable from moving can be formed to prevent the cable from detaching. That is, the width of the plate of the terminal block 3 is greater than the inner diameter of the cold shrink insulation tube 2, so that the terminal block 3 is inserted from the outside to the inside into the cold shrink insulation tube 2 to connect with the conductor core, thereby achieving the anti-detachment effect. This method is more convenient than fixing the grounding wire 4 with a constant force spring as a fixing part, and there is no need to wrap PVC tape on the steel armor layer. It is only necessary to wrap the whole after the assembly is completed.

[0023] The fixing mechanism 5 is a cylindrical component with several abutment protrusions 51 evenly distributed along its circumference on its inner circumferential surface. When the cable is inserted into the fixing mechanism 5, the abutment protrusions 51 abut against the steel armor layer of the cable. One of the abutment protrusions 51 also simultaneously fixes the grounding wire 4. After the abutment protrusions 51 are installed, the overall inner diameter of the fixing mechanism 5 is smaller than the outer diameter of the cable's steel armor layer (while the inner circumferential surface of the fixing mechanism 5 is adapted to the outer diameter of the cable's steel armor layer). The fixing mechanism 5 is made of rubber to allow the abutment protrusions 51 to be deformable under pressure. This ensures that the inner diameter formed by the abutment protrusions 51 can adapt to the outer diameter of the cable's steel armor layer through compression deformation when the cable enters, and that it can recover its shape after deformation. The restoring force, due to the restoring constraint, will be transformed into a resisting force, thereby preventing the cable from moving or rotating freely within it, thus keeping the cable stably within the fixing mechanism 5. Because of this, when the abutting protrusion 51 acts on the grounding wire 4, the grounding wire 4 can always remain in contact with the steel armor layer of the cable. After the abutting protrusion 51 deforms, it can reduce the gap it generates, and the gap only occurs at the abutting protrusion 51. At other locations, the inner circumference of the fixing mechanism 5 is in contact with the steel armor layer of the cable. At the same time, the rubber material also allows the outer circumference of the fixing mechanism 5 to generate frictional resistance between the inner circumference of the main body of the three-finger sleeve 1 during movement or rotation, which can prevent the fixing mechanism 5 from detaching from the three-finger sleeve 1. In this embodiment, the abutting protrusion 51 is formed together with the forming and fixing mechanism 5. Its configuration is triangular. The oblique part can also be used as a guide structure for the cable when it enters, reducing the obstruction when passing through. However, after it is fully inserted, its triangular configuration will be transformed into a trapezoidal configuration due to compression, so that it can fully contact the connecting wire 4 and increase the fixing stability.

[0024] The grounding wire 4 has a socket 41 through which the abutment protrusion 51 passes. The grounding wire 4 uses the socket 41 formed on itself to form a mating fit with the abutment protrusion 51, which can limit the grounding wire 4 so that the grounding wire 4 cannot move.

[0025] The outer circumferential surface of the main body of the three-finger sleeve 1 is provided with an assembly node 11, and the fixing mechanism 5 is provided with an assembly component 52. After the fixing mechanism 5 is inserted into the main body of the three-finger sleeve 1, the assembly component 52 prevents the fixing mechanism 5 from detaching from the main body of the three-finger sleeve 1 by engaging with the assembly node 11. This design takes into account that the rubber material will harden over time, that is, the frictional resistance generated between the outer circumferential surface of the fixing mechanism 5 and the inner circumferential surface of the main body of the three-finger sleeve 1 will weaken, thus restricting the free movement of the fixing mechanism 5 within the main body. The reduced rotational capacity, coupled with external forces (such as wind), can cause the fixing mechanism 5 to separate from the three-finger sleeve 1. Therefore, the assembly stability of the fixing mechanism 5 and the three-finger sleeve 1 is increased by fixing the assembly node 11 and the assembly component 52. This also ensures that the constraint on the grounding wire 4 is maintained, allowing the grounding wire 4 to remain in contact with the steel armor layer of the cable. Furthermore, it achieves a tool-free and component-free assembly mode for the three-finger sleeve 1 and the fixing mechanism 5, suitable for rapid and convenient assembly. In this embodiment, the assembly node 11 is a semi-circular structure with an insertion space for the assembly component 52. The assembly component 52 is a columnar structure formed by protrusions on the surface of the fixing mechanism 5.

[0026] The outer circumferential surface of the main body of the three-finger sleeve 1 is provided with a first guide channel 12, a second guide channel 13, and a third guide channel 14 to guide the assembly component 52 to the assembly node 11 in the assembly direction. The first guide channel 12 has a lower opening 121 on the main body of the three-finger sleeve 1 to guide the assembly component 52 into the first guide channel 12. The second guide channel 13 connects the first guide channel 12 and the third guide channel 14, and the third guide channel 14 communicates with the assembly node 11. The assembly component 52 can reach the assembly node 11 through the first guide channel 12, the second guide channel 13, and the third guide channel 14. The assembly node 11 is combined with the assembly node 11. Due to the difference in the extension direction of the first guide channel 12, the third guide channel 14 and the second guide channel 13, the extension direction of the first guide channel 12 and the third guide channel 14 is vertical, while the extension direction of the second guide channel 13 is horizontal. Even if the assembly 52 is separated from the assembly node 11, it is more difficult for it to escape from the third guide channel 14 to the second guide channel 13 to separate the fixing mechanism and the three-finger sleeve 1. In addition, it also increases the total length of the route for the assembly 52 to reach the assembly node 11, which can also increase the difficulty of the assembly 52 escaping.

[0027] The outer circumferential surface of the main body of the three-finger sleeve 1 is provided with a first reversing channel 15 for guiding the assembly 52 to the second guiding channel 13 via the first guiding channel 12, and a second reversing channel 16 for guiding the assembly 52 to the third guiding channel 14 via the second guiding channel 13. The first reversing channel 15 connects the first guiding channel 12 and the second guiding channel 13, and the second reversing channel 16 connects the second guiding channel 13 and the third guiding channel 14, so that there is continuity in the connection of the guiding direction. In this way, the assembly 52 can be reversed relatively smoothly from the first guiding channel 12 to the second guiding channel 13, and from the second guiding channel 13 to the third guiding channel 14.

[0028] The assembly 52 has a self-locking structure 521 that abuts against the outer peripheral surface of the main body of the three-finger sleeve 1 and prevents the fixing mechanism 5 from separating from the three-finger sleeve 1. The self-locking structure 521 prevents the three-finger sleeve 1 from separating from the fixing mechanism 5. Specifically, when the self-locking structure 521 contacts the inner peripheral surface of the main body of the three-finger sleeve 1, it generates frictional resistance during the movement of the assembly 52, thereby increasing the difficulty for the assembly 52 to detach from the assembly node 11, thus ensuring that the assembly 52 remains stably within the assembly node 11. In this embodiment, the self-locking structure 5 is configured as a cap-shaped structure extending radially from a columnar structure.

[0029] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A 1.8 / 3 kV cable accessory for wind power, comprising a three-fingered sleeve (1) for the passage of a conductor core obtained by stripping a part of the cable and for the insertion of the cable with only the outer insulation layer stripped, a cold shrinkage insulation tube (2) which is fitted over the extended conductor core and at the same time is inserted into the finger sleeves of the three-fingered sleeve (1), and a terminal (3) for the insertion of the electrical end of the conductor core which is passed through, characterized in that: It also includes a grounding wire (4) installed on the steel armor layer of the cable where only the outer insulation layer is stripped. The main body of the three-finger sleeve (1) is fitted with a fixing mechanism (5) for fixing the grounding wire (4) installed on the steel armor layer of the cable. The fixing mechanism (5) is also assembled together with the main body of the three-finger sleeve (1).

2. The 1.8 / 3kV wind power cable accessory according to claim 1, characterized in that: The fixing mechanism (5) is configured as a cylindrical component, and a plurality of abutting protrusions (51) are formed on its inner circumferential surface at equal intervals along its circumference. When the cable is inserted into the fixing mechanism (5), the abutting protrusions (51) will abut against the steel armor layer of the cable, and one of the abutting protrusions (51) will also fix the grounding wire (4) at the same time.

3. The 1.8 / 3kV wind power cable accessory according to claim 2, characterized in that: The grounding wire (4) has a socket (41) through which the abutment protrusion (51) passes.

4. The 1.8 / 3kV wind power cable accessory according to claim 1, characterized in that: The outer circumferential surface of the main body of the three-finger sleeve (1) is provided with an assembly node (11), and the fixing mechanism (5) is provided with an assembly component (52). After the fixing mechanism (5) is inserted into the main body of the three-finger sleeve (1), the assembly component (52) prevents the fixing mechanism (5) from detaching from the main body of the three-finger sleeve (1) by combining with the assembly node (11).

5. The 1.8 / 3kV wind power cable accessory according to claim 4, characterized in that: The outer peripheral surface of the main body of the three-finger sleeve (1) is provided with a first guide channel (12), a second guide channel (13), and a third guide channel (14) to guide the assembly component (52) to the assembly node (11) in the assembly direction. The first guide channel (12) has a lower opening (121) on the main body of the three-finger sleeve (1) to guide the assembly component (52) into the first guide channel (12). The second guide channel (13) connects the first guide channel (12) and the third guide channel (14). The third guide channel (14) communicates with the assembly node (11).

6. The 1.8 / 3kV wind power cable accessory according to claim 5, characterized in that: The outer peripheral surface of the main body of the three-finger sleeve (1) is provided with a first reversing channel (15) that guides the assembly (52) from the first guiding channel (12) to the second guiding channel (13) via the reversing direction, and a second reversing channel (16) that guides the assembly (52) from the second guiding channel (13) to the third guiding channel (14).

7. The 1.8 / 3kV wind power cable accessory according to claim 4, characterized in that: The assembly (52) has a self-locking structure (521) that can abut against the outer peripheral surface of the main body of the three-finger sleeve (1) and prevent the fixing mechanism (5) and the three-finger sleeve (1) from separating.

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