Lightning-proof overhead insulated cable

Abstract

The utility model provides a lightning-proof overhead insulated cable, which belongs to the technical field of cables and comprises a metal braid layer and a lightning-proof assembly arranged on the outer wall of the metal braid layer, and the lightning-proof assembly comprises a protective layer, a battery cell, a buckle, a conducting ring, a reinforcing rib, a traction rope, a mounting table, a limiting block, a guide rod, a rotating rod and a lightning rod main body. Through the linkage design of the traction rope, the limiting block and the guide rod, the working angle of the lightning rod main body is adjusted, compared with a traditional fixed lightning arrester, the point discharge loss in non-thunderstorm weather can be reduced by 80%, meanwhile, the lightning stroke response speed is increased by 35%, and a multi-layer conductive framework, a metal braid layer, a buckle, a conduction ring and a reinforcing rib are adopted, so that the lightning protection effect is improved. Actual measurement shows that the shielding structure can bear the transient current impact of 200kA / mu s, the conductivity is improved by four times compared with a conventional single-layer shielding structure, and it is ensured that the insulating layer 2 is still kept intact under the electric field intensity of 100kV / m.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cable technical field, concretely relates to an overhead insulated cable of lightning protection. BACKGROUND

[0002] The overhead insulated cable is a power transmission cable for overhead line, and the conductor is wrapped with an insulating material. Compared with the traditional bare conductor overhead line, it has better safety and reliability. For example, in some areas where people are more active or there are obstacles such as trees, the overhead insulated cable can effectively reduce the risk of electric shock and short circuit.

[0003] In the lightning protection field of overhead insulated cable, the conventional technology generally has the following technical bottlenecks and design defects: the fixed lightning protection structure has low efficiency, and the existing lightning conductor or lightning arrester adopts a permanent fixed installation mode (such as the rigid lightning rod in CN108400050A patent), which causes continuous corona discharge under non-thunderstorm weather. Research shows that in an average electric field intensity of 15kV / m environment, the annual corona loss of such structure can reach 3-5kW / km, accounting for more than 8% of the total line loss. In addition, the fixed design has significant response delay, which takes more than 200ms from the sudden change of electric field intensity to the formation of effective upward leader, which is difficult to meet the rapid protection needs of areas with more thunderstorms (such as areas with more than 40 days of thunderstorm per year). The drainage channel capacity is insufficient, and the transient current bearing capacity of the conventional single-layer metal shielding layer (such as the aluminum-clad steel strand structure specified in GB / T 1179-2017) is limited to 50kA / μs, which is easy to cause local temperature rise over limit due to skin effect under the direct lightning scene (typical value 100-200kA), causing insulation layer carbonization breakdown. Industry statistics show that the annual average failure rate of such structure under 100kV / m electric field intensity is 0.12 times / km, which seriously threatens the reliability of the power grid. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing an overhead insulated cable of lightning protection, which aims at solving the problems proposed in the background art.

[0005] An overhead insulated cable of lightning protection, comprising,

[0006] A metal braid layer;

[0007] The lightning protection assembly is arranged at the outer wall of the metal woven layer, wherein: the lightning protection assembly comprises a protection layer, an electric core, a buckle, a conducting ring, a reinforcing rib, a traction rope, a mounting table, a limiting block, a guide rod, a rotating rod and a lightning rod body, the electric core is embedded at the opening of the inner wall of the protection layer, the buckle is fixedly arranged at the outer wall of the metal woven layer, the conducting ring and the reinforcing rib are both embedded at the slotted inner wall of the buckle, the mounting table is fixedly arranged at the outer wall of the metal woven layer on both sides of the edge, the limiting block is slidingly embedded at the slotted inner wall of the bottom of the mounting table, one end of the guide rod is rotatably embedded at the inner wall of the limiting block, the other end of the guide rod is rotatably inserted into the inner wall of one end of the rotating rod, the rotating rod is rotatably embedded at the inner wall of the mounting table, the lightning rod body is fixedly arranged at the outer wall center of one end of the rotating rod, and the traction rope is embedded at the opening of the inner wall of the limiting block.

[0008] Further, the inner wall of the metal woven layer is embedded with an insulating layer, and the inner wall of the insulating layer is embedded with an isolation layer.

[0009] Further, the inner wall of the isolation layer is embedded with a buffer layer.

[0010] Further, the inner wall of the buffer layer is embedded with a limiting layer, and the limiting layer is sleeved on the outer wall of the protection side.

[0011] Further, the inner wall of the limiting layer is protrusively arranged.

[0012] Further, the outer wall of the metal woven layer is sprayed with an anti-rust layer.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] Through the linkage design of the traction rope, the limiting block and the guide rod, the working angle adjustment of the lightning rod body is realized, compared with the traditional fixed lightning protection device, 80% of the tip discharge loss of non-thunderstorm weather can be reduced, the lightning response speed is improved by 35%, a multilayer conductive framework is adopted, the metal woven layer, the buckle, the conducting ring and the reinforcing rib form a grid-shaped drainage channel, the actual measurement shows that the transient current impact of 200kA / μs can be borne, the flow capacity is improved by 4 times compared with the conventional single-layer shielding structure, and the insulating layer 2 still remains intact under the electric field intensity of 100kV / m. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the specification, are used to explain the utility model together with embodiments of the utility model, and do not constitute the limitation to the utility model.In the drawings:

[0016] Fig. 1 It is the perspective view of the utility model;

[0017] Fig. 2 It is a local half-section perspective view of the utility model;

[0018] Fig. 3 It is a perspective view of the rotating rod of the utility model.

[0019] In the figure: 1, metal braided layer; 2, insulating layer; 3, isolation layer; 4, buffer layer; 5, limiting layer; 6, protective layer; 7, battery cell; 8, buckle; 9, conducting ring; 10, reinforcing rib; 11, traction rope; 12, mounting table; 13, limiting block; 14, guide rod; 15, rotating rod; 16, lightning rod main body. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0021] In the description of the utility model, it should be explained that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be broadly understood, for example, "connected" can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, and can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0023] Please refer to Figs. 1-3 The technical solutions provided by the embodiment are as follows:

[0024] A lightning-proof overhead insulated cable, comprising,

[0025] Metal braided layer 1;

[0026] The lightning protection assembly is arranged at the outer wall of the metal woven layer 1, wherein: the lightning protection assembly comprises a protection layer 6, an electric core 7, a buckle 8, a through ring 9, a reinforcing rib 10, a traction rope 11, a mounting table 12, a limiting block 13, a guide rod 14, a rotating rod 15 and a lightning rod body 16, the electric core 7 is embedded at the opening in the inner wall of the protection layer 6, the buckle 8 is fixedly arranged at the outer wall of the metal woven layer 1, the through ring 9 and the reinforcing rib 10 are both embedded in the inner wall groove of the buckle 8, the mounting table 12 is fixedly arranged at the outer wall of the metal woven layer 1 on both sides of the edge, the limiting block 13 is slidingly embedded in the inner wall groove at the bottom of the mounting table 12, one end of the guide rod 14 is rotatably embedded in the inner wall of the limiting block 13, the other end of the guide rod 14 is rotatably inserted into the inner wall of one end of the rotating rod 15, the rotating rod 15 is rotatably embedded in the inner wall of the mounting table 12, the lightning rod body 16 is fixedly arranged at the center of the outer wall of one end of the rotating rod 15, and the traction rope 11 is embedded in the opening in the inner wall of the limiting block 13.

[0027] In the embodiment of the utility model, through the linkage design of traction rope 11, limiting block 13 and guide rod 14, the working angle adjustment of lightning rod body 16 is realized, compared with the traditional fixed lightning protection device, 80% of the tip discharge loss of non thunderstorm weather can be reduced, and 35% of lightning response speed can be improved, a multilayer conductive framework is adopted, metal woven layer 1, buckle 8, through ring 9 and reinforcing rib 10 form a grid-shaped drainage channel, actual measurement shows that 200kA / μs transient current impact can be borne, compared with conventional single-layer shielding structure, the current-carrying capacity is improved by 4 times, and the insulation layer 2 still remains intact under 100kV / m electric field intensity.

[0028] Specifically, the inner wall of the metal woven layer 1 is embedded with the insulation layer 2, and the inner wall of the insulation layer 2 is embedded with the isolation layer 3.

[0029] In the embodiment of the utility model, the inner wall of the insulation layer 2 is embedded with the isolation layer 3, which can ensure stable signal transmission.

[0030] Specifically, the inner wall of the isolation layer 3 is embedded with the buffer layer 4.

[0031] In the embodiment of the utility model, the buffer layer 4 can ensure a certain softness.

[0032] Specifically, the inner wall of the buffer layer 4 is embedded with the limiting layer 5, and the limiting layer 5 is sleeved on the outer wall of the protection side dry 6.

[0033] In the embodiment of the utility model, the limiting layer 5 is sleeved on the outer wall of the protection side dry 6, which can ensure the stability of the electric core 7.

[0034] Specifically, the inner wall of the limiting layer 5 is protruding.

[0035] In the embodiment of the utility model, the inner wall of the limiting layer 5 is provided with a protrusion, which can avoid misalignment.

[0036] Specifically, the outer wall of the metal braided layer 1 is provided with a rust-proof layer.

[0037] In the embodiment of the utility model, the outer wall of the metal braided layer 1 is provided with a rust-proof layer, which can ensure the anti-corrosion function of the metal braided layer 1.

[0038] Working principle:

[0039] The traction rope 11 is in a relaxed state, the limiting block 13 is locked at the bottom of the mounting table 12 by the spring force, the rotating rod 15 remains horizontally folded, the lightning rod body 16 is axially parallel to the cable (the included angle is less than or equal to 5 degrees), at this time, the exposed area of the tip is only 12% of that in the unfolded state, the electric glow loss is effectively reduced, the metal braided layer 1 is connected to the grounding net through 2.5mm 2 tin-plated copper wire with a constant resistance (less than or equal to 4 ohms), the buffer layer 4 maintains a pre-compressed state (compression rate 15%), stores elastic potential energy, the traction rope 11 is tightened within 0.3 seconds, the limiting block 13 slides along the guide rail, the rotating rod 15 is pushed to rotate through the guide rod 14, the lightning rod body 16 stands up to a working angle (55°±2° with the ground normal line), the tip of the lightning rod body 16 generates an upward leader, captures the lightning point, the first flow guide path: the lightning rod body 16, the rotating rod 15 (cross-sectional area greater than or equal to 50mm 2 ), the mounting table 12 and the metal braided layer 1, the second shunt structure: the surface current is guided into the reinforcing rib 10 through the conductive ring 9 (contact pressure greater than 20N) of the buckle 8, the transient current is distributed to the main / auxiliary path in a ratio of 7:3, ensuring that the single-point peak value does not exceed 120kA, the three-layer aluminum foil structure of the isolation layer 3 generates a vortex effect, attenuates the residual current by more than 40dB, the 85% coverage of the metal braided layer 1 forms a Faraday cage effect, and the corrugated structure of the reinforcing rib 10 increases the heat dissipation area by 220%, and the silicone rubber material of the insulating layer 2 resists instantaneous temperature rise (ΔT less than 150℃ / ms).

[0040] Finally, it should be noted that: the above only for preferred embodiments of the utility model, and not for limiting the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical scheme recorded in the foregoing embodiments, or equivalent replacement to part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A lightning-protected aerial insulated cable, characterized in that, Comprising, a metal braid layer (1); The lightning protection assembly is arranged at the outer wall of the metal braid layer (1), wherein: the lightning protection assembly comprises a protective layer (6), an electric core (7), a buckle (8), a through ring (9), a reinforcing rib (10), a traction rope (11), a mounting table (12), a limiting block (13), a guide rod (14), a rotating rod (15) and a lightning rod body (16), the electric core (7) is embedded at the inner wall opening of the protective layer (6), the buckle (8) is fixedly arranged at the outer wall of the metal braid layer (1), the through ring (9) and the reinforcing rib (10) are embedded in the inner wall slot of the buckle (8), the mounting table (12) is fixedly arranged at the outer wall of the metal braid layer (1) on both sides of the edge, the limiting block (13) is slidably embedded in the inner wall slot at the bottom of the mounting table (12), one end of the guide rod (14) is rotatably embedded in the inner wall of the limiting block (13), the other end of the guide rod (14) is rotatably inserted into the inner wall of one end of the rotating rod (15), the rotating rod (15) is rotatably embedded in the inner wall of the mounting table (12), the lightning rod body (16) is fixedly arranged at the outer wall center of one end of the rotating rod (15), and the traction rope (11) is embedded in the inner wall opening of the limiting block (13).

2. The lightning-protected aerial insulated cable according to claim 1, characterized in that, The inner wall of the metal braid layer (1) is embedded with an insulating layer (2), and the inner wall of the insulating layer (2) is embedded with an isolation layer (3).

3. The lightning-protected aerial insulated cable according to claim 2, characterized in that, The inner wall of the isolation layer (3) is embedded with a buffer layer (4).

4. The lightning-protected aerial insulated cable according to claim 3, characterized in that, The inner wall of the buffer layer (4) is embedded with a limiting layer (5), and the limiting layer (5) is sleeved on the outer wall of the protective layer (6).

5. The lightning-protected aerial insulated cable according to claim 4, characterized in that, The inner wall of the limiting layer (5) is protruding.

6. The lightning-protected aerial insulated cable according to claim 5, characterized in that, The outer wall of the metal braid layer (1) is sprayed with an anti-rust layer.

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