Electric power circuit composite cross arm device and cross arm lead structure

Abstract

The invention discloses a power line composite cross arm device and a cross arm lead structure, and belongs to the technical field of composite cross arms. An electric power line composite cross arm device and a cross arm lead structure, the electric power line composite cross arm device comprises a composite cross arm main body, an embedded part and an installation assembly, the composite cross arm main body is provided with an installation part and at least one cantilever part extending outwards, the installation assembly is arranged on the installation part and is used for fixing the composite cross arm main body on a tower, and the embedded part is embedded in the cantilever part. According to the electric power circuit composite cross arm device and the cross arm lead structure, the corrosion problem is eradicated through the all-insulation composite material, the embedded part and the composite material form rubber bolt composite connection through the anchoring structure with the through hole, the reliability is extremely high, and the overall structure is long in service life and free of maintenance; the built-in spiral lead channel changes the power lead from external exposure to internal protection, and eliminates the safety spacing required by an external jumper.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite cross arm, in particular to a power line composite cross arm device and cross arm lead structure. BACKGROUND

[0002] Traditional power transmission line tower cross arms are mostly made of metal materials such as angle steel and steel pipe, which have problems such as excessive self-weight, easy corrosion, need to rely on insulator strings for insulation, and wide line corridor. In the harsh environment of high salt fog and high humidity around nuclear power plants, the corrosion problem of metal cross arms is particularly prominent, which seriously threatens the reliability and service life of the nuclear power plant transmission line.

[0003] To solve the above problems, composite cross arms such as glass fiber reinforced plastic cross arms have appeared. However, the existing composite cross arms have the following shortcomings: 1) the connection reliability of metal connecting parts and composite main body is insufficient, which becomes a mechanical weak point; 2) there is no targeted surface protection, and the ultraviolet aging resistance and anti-pollution flashover ability need to be improved; 3) the function is single, and it is not integrated with the lead and other functions, which cannot meet the extreme pursuit of compactness, high reliability and maintenance-free of nuclear power projects; 4) the traditional bare jumper method has the risk of electric shock, corrosion and reliability.

[0004] Therefore, an integrated composite cross arm solution that integrates high-reliability connection, long-acting protection and built-in lead function is urgently needed. SUMMARY

[0005] The purpose of the present application is to provide a power line composite cross arm device and cross arm lead structure, which completely eliminates the corrosion problem by using fully insulated composite materials, and the anchor structure with holes is used to form a "glue bolt composite" connection with the composite material, which has extremely high reliability, long service life and is maintenance-free. The built-in spiral lead channel changes the power lead from "external exposure" to "internal protection", eliminating the safety distance required by external jumpers, greatly reducing the line corridor width, and solving the problems raised in the background art.

[0006] To achieve the above purpose, the present application provides the following technical scheme: a power line composite cross arm device and cross arm lead structure, comprising a composite cross arm main body, a pre-embedded part and a mounting assembly, the composite cross arm main body is provided with a mounting part and at least one cantilever part extending outward, the mounting assembly is arranged on the mounting part and used for fixing the composite cross arm main body to the tower, the pre-embedded part is embedded in the cantilever part and used for connecting with external fittings, the outer surface of the composite cross arm main body is coated with a water-repellent anti-pollution flashover coating and an anti-ultraviolet aging coating, and at least one non-metal lead channel is arranged in the composite cross arm main body along the length direction.

[0007] Preferably, the two ends of the lead channel are respectively provided with a lead inlet and a lead outlet, and the lead inlet and the lead outlet are both provided with a sealing structure.

[0008] Preferably, the sealing structure comprises a threaded pipe, a threaded sleeve and a flexible sleeve, the threaded pipe is fixedly connected with the lead-in or lead-out, the upper end of the flexible sleeve is provided with a sealing ring, the lower end of the flexible sleeve is sleeved on the power lead, the threaded sleeve is sleeved outside the flexible sleeve, the lower end of the threaded sleeve is provided with a limiting ring, and the threaded sleeve is screwed to enable the limiting ring to extrude the sealing ring, so that the sealing ring is deformed in the radial direction to seal the power lead.

[0009] Preferably, the lead channel is spiral, spirally advances around the longitudinal axis of the composite cross arm body, and the inner wall of the lead channel is lined with a flexible insulation lining.

[0010] Preferably, the embedded part comprises a core connecting plate and an anchoring structure, one side of the core connecting plate is fixedly connected with the anchoring structure, the anchoring structure is a hollow column structure, and a through hole is formed in the side wall of the anchoring structure, and a mounting hole and a construction hole are formed in the core connecting plate.

[0011] Preferably, the mounting assembly comprises a fixed clamp and a U-shaped bolt, the two ends of the fixed clamp are provided with first and second fixed ears, the first and second fixed ears are provided with U-shaped bolts, and a first positioning hole is formed in the fixed clamp for the sealing structure to pass through.

[0012] Another technical problem to be solved by the present application is to provide a cross arm lead structure used by a power line composite cross arm device, which comprises a power lead and a lead connection assembly, the power lead is arranged in the lead channel, the lead connection assembly comprises an insulation connecting box and a mounting bracket, the mounting bracket is used for fixing the insulation connecting box on the cantilever part of the composite cross arm body; one end of the power lead is connected into the insulation connecting box and connected with an external conductor.

[0013] Preferably, the mounting bracket comprises an upper fixed bracket and a lower fixed bracket; the lower fixed bracket is fixedly embraced on the cantilever part, a second positioning hole for clamping and fixing the power lead is formed in the lower fixed bracket, the upper fixed bracket is connected with the lower fixed bracket, and a convex table is arranged on the upper surface of the upper fixed bracket; a mounting groove matched with the convex table is arranged on the lower surface of the insulation connecting box.

[0014] Preferably, the inside of the insulation connecting box is filled with a silicone rubber gel or an epoxy resin sealing material; wire inlet holes and wire outlet holes are arranged at both ends of the insulation connecting box, and sealing structures are arranged on the wire inlet holes and the wire outlet holes.

[0015] Preferably, the power lead is a cross-linked polyethylene insulated cable.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] The power line composite cross arm device and cross arm lead structure of the present application, full insulation composite material eliminates the problem of corrosion, the embedded part is connected with the composite material through the "glue bolt composite" connection of the anchor structure with the through hole, the reliability is extremely high, the overall structure has long service life and is maintenance-free; the built-in spiral lead channel changes the power lead from "external exposure" to "internal protection", eliminates the safety distance required by external jumpers, greatly compresses the line corridor width; the hydrophobic anti-pollution flashover coating ensures excellent anti-flashover performance; the anti-ultraviolet coating effectively delays material aging; the downward design of the inlet and outlet and the multiple sealing structure utilize gravity waterproof, and the protection level is high; the spiral lead channel effectively increases the ground capacitance, smooths the electric field distribution, and significantly suppresses the level of corona discharge and electromagnetic interference; the inside of the insulation connecting box is filled with silicone rubber, the lifelong maintenance-free of the electrical connection point is realized, and the reliability bottleneck of the traditional jumper is completely solved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the overall structure diagram of the power line composite cross arm device of the present application;

[0019] Figure 2 It is the exploded view of the power line composite cross arm device of the present application;

[0020] Figure 3 It is the structure diagram of the installation assembly of the present application;

[0021] Figure 4 It is the structure diagram of the embedded part of the present application;

[0022] Figure 5 It is the exploded view of the lead connecting assembly of the present application;

[0023] Figure 6 It is the structure diagram of the lead connecting assembly and the power lead connection of the present application;

[0024] Figure 7 It is the enlarged view of A of the present application.

[0025] In the figure: 1, composite cross arm main body; 11, mounting part; 12, cantilever part; 13, lead channel; 131, lead inlet; 132, lead outlet; 133, sealing structure; 1331, threaded tube; 1332, threaded sleeve; 13321, limiting ring; 13322, sealing pad; 1333, flexible sleeve; 13331, sealing ring; 2, embedded part; 21, core connecting plate; 211, mounting hole; 212, construction hole; 22, anchoring structure; 221, through hole; 3, mounting assembly; 31, fixed clamping piece; 311, first fixed lug; 312, second fixed lug; 313, first positioning hole; 32, U-shaped bolt; 4, power lead; 5, lead connecting assembly; 51, insulating connecting box; 511, lead-in hole; 512, lead-out hole; 513, mounting groove; 52, mounting bracket; 521, upper fixed bracket; 5211, protruding table; 522, lower fixed bracket; 5221, connecting lug; 5222, fixed hole; 5223, second positioning hole. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In order to solve the problems of insufficient connection reliability of the existing metal connecting piece and the composite main body, lack of targeted surface protection, single function, not integrated with the lead and other functions, and unable to meet the extreme pursuit of compactness, high reliability and maintenance-free of nuclear power engineering, and the naked jumper mode has the risk problems of electric shock, corrosion and reliability, please refer to Figures 1-7 The technical solutions of the present embodiment are as follows:

[0028] A composite cross arm device for power lines, comprising a composite cross arm main body 1 and an embedded part 2, the composite cross arm main body 1 is integrally formed by glass fiber reinforced epoxy resin material, the composite cross arm main body 1 is provided with a mounting part 11, the mounting part 11 is provided with a mounting assembly 3, the composite cross arm main body 1 is also provided with at least one cantilever part 12 extending outward, the embedded part 2 is arranged in the cantilever part 12, the outer surface of the composite cross arm main body 1 is coated with a hydrophobic anti-pollution flashover coating and an anti-ultraviolet aging coating, at least one non-metal lead channel 13 is arranged in the composite cross arm main body 1 along the length direction, for passing the power lead 4.

[0029] Specifically, the embedded part 2 comprises a core connecting plate 21 and an anchoring structure 22, one side of the core connecting plate 21 is fixedly connected with the anchoring structure 22, the anchoring structure 22 is embedded in the cantilever part 12, the anchoring structure 22 is a hollow column structure, and a through hole 221 is formed in the side wall of the anchoring structure 22, the composite material will flow into the hole during processing, forming a “pin”, locking the embedded part 2, a mounting hole 211 and a construction hole 212 are formed in the core connecting plate 21, the mounting hole 211 is used for penetrating a bolt or a pin shaft and connecting with an external fitting, and the construction hole 212 is used for construction and maintenance.

[0030] More specifically, the lead channel 13 is spiral-shaped, surrounds the longitudinal axis of the composite cross arm body 1, and spirally advances with equal pitch, which can effectively increase the lead path length and disperse the electromagnetic field. When the composite cross arm body 1 is formed by a mold pressing process or a pultrusion process, the lead channel 13 is reserved by arranging a flexible inner mold core that can be pulled out inside the mold. The flexible inner mold core is usually made of a high-strength nylon tube, a Teflon tube or a soluble wax core, and is accurately arranged in a spiral path in the mold. After the composite material is cured, the inner mold core is pulled out, forming the required non-linear channel. One end of the lead channel 13 close to the mounting part 11 is provided with a lead inlet 131, and the other end of the lead channel 13 close to the cantilever part 12 is provided with a lead outlet 132. The lead inlet 131 and the lead outlet 132 are both downwardly opened. After the power lead 4 is led down from the inside or top of the tower along the pole body, it is penetrated into the lead channel 13 of the cross arm from the lead inlet 131, and then is penetrated out of the lead outlet 132 through the lead channel 13. A flexible insulating lining is arranged on the inner wall of the lead channel 13 for protecting the insulating layer of the power lead 4.

[0031] It should be noted that the lead-in port 131 and the lead-out port 132 are provided with sealing structures 133, specifically including threaded pipes 1331, threaded sleeves 1332 and flexible sleeves 1333, the threaded pipes 1331 are fixedly connected with the lead-in port 131 and the lead-out port 132, for fixing the position of the lead, the lower end of the threaded sleeve 1332 is provided with a limiting ring 13321, the upper end of the flexible sleeve 1333 is provided with a sealing ring 13331, the flexible sleeve 1333 passes through the limiting ring 13321, the sealing ring 13331 is arranged in the threaded sleeve 1332 and is engaged with the threaded pipe 1331 under the control of the threaded sleeve 1332, the lower end surface of the threaded pipe 1331 is in contact with the sealing ring 13331, after the threaded sleeve 1332 is tightened, the limiting ring 13321 below the threaded sleeve 1332 is extruded with the lower end surface of the threaded pipe 1331, the sealing ring 13331 is deformed under extrusion, the inner ring is close to the power lead 4 to complete sealing, at the same time, the flexible sleeve 1333 is sleeved on the outside of the power lead 4, relying on gravity to realize the effect of waterproof and dustproof, in addition, in order to further improve the sealing effect, the upper end surface of the threaded sleeve 1332 is provided with a sealing gasket 13322, by screwing the threaded sleeve 1332, the sealing gasket 13322 is abutted with the side wall of the composite cross arm main body 1, realizing multi-layer sealing.

[0032] In the embodiment, the mounting assembly 3 includes a fixed clamp 31 and a U-shaped bolt 32, both ends of the fixed clamp 31 are provided with a first fixed lug 311 and a second fixed lug 312, the first fixed lug 311 and the second fixed lug 312 are provided with the U-shaped bolt 32, the U-shaped bolt 32 is sleeved with the upper end of the tower, the composite cross arm main body 1 is fixed to the tower through the fixed clamp 31 and the U-shaped bolt 32, a first positioning hole 313 is formed in the position close to the lead-in port 131 below the fixed clamp 31, the sealing structure 133 on the lead-in port 131 penetrates the first positioning hole 313, avoiding structural interference between the sealing structure 133 and the fixed clamp 31 during installation.

[0033] Another technical problem to be solved by the application is to provide a cross arm lead structure used by a power line composite cross arm device, which includes a power lead 4 and a lead connection assembly 5, the lead connection assembly 5 includes an insulating connection box 51 and a mounting frame 52, the power lead 4 adopts a cross-linked polyethylene insulated cable, one end of which is connected with a line conductor, and the other end penetrates through a lead passage 13 and is connected with an external conductor.

[0034] Specifically, the mounting frame 52 comprises an upper fixed frame 521 connected with the lower surface of the insulating connecting box 51 and a lower fixed frame 522 embracing the cantilever part 12, both ends of the upper fixed frame 521 and the lower fixed frame 522 are provided with connecting ears 5221, symmetrical fixing holes 5222 for mounting bolts are arranged on both sides of the connecting ears 5221, second positioning holes 5223 are arranged between the fixing holes 5222, one side of the second positioning holes 5223 is of an open structure, during installation, the power lead 4 sleeved with the flexible sleeve 1333 is clamped into the second positioning holes 5223 to fix the position of the power lead 4. The upper surface of the upper fixed frame 521 is provided with a raised platform 5211, the middle of the raised platform 5211 is of a hollow structure, the lower surface of the insulating connecting box 51 is provided with a mounting groove 513 matched with the raised platform 5211, the mounting groove 513 is connected with the raised platform 5211 through bolts, the mounting groove 513 is not communicated with the inside of the insulating connecting box 51, and the bottom of the insulating connecting box 51 is provided with a horizontally arranged bolt hole, the bolt after installation is in the space surrounded by the raised platform 5211 and the upper fixed frame 521, relatively sealed, in addition, both ends of the insulating connecting box 51 are provided with wire inlet holes 511 and wire outlet holes 512, the wire inlet holes 511 and the wire outlet holes 512 are also provided with sealing structures 133, the insulating connecting box 51 is made of high-strength engineering plastic or fiber-reinforced composite material, has excellent weather resistance, anti-aging property, electrical insulation and mechanical strength, has enough cavity inside to accommodate the wire clamp and the bent wire, is provided with a conductive connecting piece inside for reliably connecting the power lead 4 and the external wire, after the connection is completed, before closing the box cover, silicon rubber gel or epoxy resin is filled into the box body to form full-wrapped sealing, completely eliminates internal condensation and any water seepage possibility.

[0035] Working process: install the composite cross arm body 1 to the designated position of the tower through the installation assembly 3, lead the power lead 4 down from the upper part of the tower, vertically downward into the lead inlet 131, tighten the threaded sleeve 1332 at the inlet, compress the flexible sleeve 1333 to deform, so that the inner ring tightly holds the outer insulating layer of the power lead 4, and the outer ring is pressed tightly with the threaded tube 1331, the power lead 4 passes through the spiral lead channel 13 inside the composite cross arm body 1, the flexible insulating lining on the inner wall of the lead channel 13 protects the insulating layer from being abraded, the spiral path effectively increases the lead length, disperses the electromagnetic field, suppresses the corona and interference, the power lead 4 passes out of the lead outlet 132, and is sealed by tightening the sealing structure 133 at the outlet, the passed-out lead is clamped into the second positioning hole 5223 of the lower fixing bracket 522 of the mounting bracket 52 for preliminary fixation, the end of the power lead 4 and the end of the external conductor are respectively inserted into the box through the wire inlet hole 511 and the wire outlet hole 512 on both sides of the insulating connection box 51, and the locking nuts of the inlets are tightened to complete the sealing, the two conductors are reliably connected by using a wire clamp or a piercing clamp in the box, the insulating connection box 51 is filled with silicone rubber gel to completely fill the internal cavity and wrap all the connection points, and after forming a fully sealed insulating structure, the box cover is closed, the mounting groove 513 at the bottom of the insulating connection box 51 is aligned with the protruding table 5211 of the upper fixing bracket 521 of the mounting bracket 52, and is fixed by a bolt, that is, the whole installation process is completed, and thereafter, the current can be transmitted through the built-in power lead 4.

[0036] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0037] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application.

Claims

1. A composite crossarm device for power lines, comprising a composite crossarm body (1), embedded parts (2), and installation components (3), characterized in that, The composite crossarm body (1) is provided with an installation part (11) and at least one outwardly extending cantilever part (12). The installation component (3) is provided on the installation part (11) for fixing the composite crossarm body (1) to the tower. The embedded part (2) is embedded in the cantilever part (12) for connecting with external hardware. The outer surface of the composite crossarm body (1) is coated with a hydrophobic anti-flashover coating and an anti-ultraviolet aging coating. The interior of the composite crossarm body (1) is provided with at least one non-metallic lead wire channel (13) along the length direction.

2. The composite crossarm device for power lines according to claim 1, characterized in that, The lead channel (13) is provided with a lead inlet (131) and a lead outlet (132) at both ends, and both the lead inlet (131) and the lead outlet (132) are provided with a sealing structure (133).

3. The composite crossarm device for power lines according to claim 2, characterized in that, The sealing structure (133) includes a threaded tube (1331), a threaded sleeve (1332), and a flexible sleeve (1333). The threaded tube (1331) is fixedly connected to the lead wire inlet (131) or the lead wire outlet (132). The upper end of the flexible sleeve (1333) is provided with a sealing ring (13331), and the lower end is sleeved on the power lead wire (4). The threaded sleeve (1332) is sleeved outside the flexible sleeve (1333), and its lower end is provided with a limit ring (13321).

4. The composite crossarm device for power lines according to claim 3, characterized in that, The lead channel (13) is spiral-shaped and spirals forward around the longitudinal axis of the composite crossarm body (1). The inner wall of the lead channel (13) is lined with a flexible insulating liner.

5. The composite crossarm device for power lines according to claim 4, characterized in that, The embedded part (2) includes a core connecting plate (21) and an anchoring structure (22). An anchoring structure (22) is fixedly connected to one side of the core connecting plate (21). The anchoring structure (22) is a hollow column structure, and a through hole (221) is opened on its side wall. An installation hole (211) and a construction hole (212) are opened on the core connecting plate (21).

6. The composite crossarm device for power lines according to claim 5, characterized in that, The mounting assembly (3) includes a fixing clip (31) and a U-bolt (32). The fixing clip (31) has a first fixing ear (311) and a second fixing ear (312) at both ends. The first fixing ear (311) and the second fixing ear (312) are both provided with U-bolts (32). The fixing clip (31) has a first positioning hole (313) for the sealing structure (133) to pass through.

7. A crossarm lead structure, used in the power line composite crossarm device as described in claim 6, characterized in that, The device includes a power lead (4) and a lead connection assembly (5), characterized in that the power lead (4) is inserted into a lead channel (13), and the lead connection assembly (5) includes an insulating connection box (51) and a mounting bracket (52). The mounting bracket (52) is used to fix the insulating connection box (51) to the cantilever (12) of the composite crossarm body (1); one end of the power lead (4) is inserted into the interior of the insulating connection box (51) and connected to an external conductor.

8. The crossarm lead structure according to claim 7, characterized in that, The mounting bracket (52) includes an upper fixing bracket (521) and a lower fixing bracket (522); the lower fixing bracket (522) is fixed around the cantilever (12), and the lower fixing bracket (522) is provided with a second positioning hole (5223) for engaging and fixing the power lead (4). The upper fixing bracket (521) is connected to the lower fixing bracket (522), and the upper surface of the upper fixing bracket (521) is provided with a protrusion (5211). The lower surface of the insulating connection box (51) is provided with a mounting groove (513) that matches the protrusion (5211).

9. The crossarm lead structure according to claim 8, characterized in that, The interior of the insulating connection box (51) is filled with silicone rubber gel or epoxy resin sealing material; the insulating connection box (51) has an inlet hole (511) and an outlet hole (512) at both ends, and both the inlet hole (511) and the outlet hole (512) are provided with a sealing structure (133).

10. The crossarm lead structure according to claim 8, characterized in that, The power lead (4) is a cross-linked polyethylene insulated cable.

Images