CN213545958U - Lightning-protection high-reliability grounding cable - Google Patents

Abstract

The utility model provides a lightning protection high-reliability grounding cable, which comprises an inner conductor positioned in the center of the cable, wherein an environment-friendly polypropylene insulating layer is extruded outside the inner conductor, a coaxial conductor is wrapped outside the environment-friendly polypropylene insulating layer, and the sectional area of the coaxial conductor is equal to that of the inner conductor; and the drainage catheters are symmetrically arranged along two sides of the outer edge of the coaxial conductor respectively, and the environment-friendly polyethylene outer sheath is extruded outside the coaxial conductor and the two drainage catheters together. The problem of current earthing cable damaged easily, with high costs and the soil around the earthing device can not stably keep certain humidity to lead to ground resistance big is solved, reduce the cost of cable when guaranteeing the grounding performance steadily, have fine economic nature.

Description

Lightning-protection high-reliability grounding cable

Technical Field

The utility model relates to a wire and cable field specifically is a high reliable earth cable of lightning protection.

Background

With the high-speed development of economy, infrastructure, high-rise buildings and other facilities in China, the frequency of lightning accidents is greatly increased, and the requirements of people on lightning protection safety are higher and higher; reliable grounding is important for lightning protection and protection of electronic and electrical equipment and personnel safety;

the grounding cable and the grounding device are a grounding system; the grounding resistance of the grounding system and the ground soil is directly related to the safety of related buildings, personnel and equipment; the smaller the ground resistance, the better; the size of the ground resistance of the ground soil is directly influenced by the humidity of the soil around the grounding device; the soil around the grounding device is affected by natural environments such as seasons and the like, and the grounding resistance is large due to the fact that certain humidity cannot be stably maintained, and the grounding performance is affected;

at present, the main grounding cables are mainly tin-plated copper conductor bare stranded wires and copper conductor cables, the tin-plated copper conductor bare stranded wires are widely applied, but because the tin-plated copper conductor bare stranded wires are bare wires, a surface coating is easily damaged and destroyed in processing, transportation and construction, and the performance is reduced; the copper conductor cable is protected by a sheath from being damaged, but the cost is high and the price is high due to the use of the copper conductor;

existing cables also have a number of problems and further improvements are needed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve prior art's problem, provide a high reliable earth cable of lightning protection, solved current earth cable easy impaired, with high costs problem and earthing device soil on every side can not stably keep certain humidity to lead to the problem that ground resistance is big, reduce the cost of cable when guaranteeing the ground connection performance steadily, have fine economic nature.

The utility model discloses a lightning protection high-reliability grounding cable, including the inner conductor that is located the cable center, the outside crowded package environmental protection polypropylene insulation layer of inner conductor, wrap the coaxial conductor outside environmental protection polypropylene insulation layer, the sectional area of this coaxial conductor equals with the sectional area of inner conductor; and the drainage catheters are symmetrically arranged along two sides of the outer edge of the coaxial conductor respectively, and the environment-friendly polyethylene outer sheath is extruded outside the coaxial conductor and the two drainage catheters together.

The coaxial conductor is formed by winding copper-clad steel monofilaments, the diameter of each copper-clad steel monofilament is not less than 2.50mm, the thickness of a copper layer is 0.290-0.310 mm, the diameter of each copper-clad steel monofilament is not less than 2.50mm, the thickness of the copper layer is 0.290-0.310 mm, and the problems that the conductor is easy to damage and is anticorrosive are solved; the strength and reliability of the grounding cable conductor are ensured.

In a further improvement, the sectional area of the inner conductor and the coaxial conductor is more than or equal to 150 square.

Further improved, the thickness of the environment-friendly polypropylene insulating layer is more than or equal to 2.0 mm.

The drainage catheter is further improved, and is a polypropylene fiber braided reinforced hose; the diameter of the drainage catheter is 0.5-1 times of that of the inner conductor, the total outer diameter of the cable is controlled on the premise that the flow of the resistance reducing agent is guaranteed, and sheath materials are saved.

Further improved, the environment-friendly polyethylene outer sheath is oval, and the thickness of the thinnest part is not less than 1.5 mm.

The utility model has the advantages that:

the utility model discloses the coaxial conductor is formed through copper clad steel monofilament transposition inner conductor and winding to the cable, has solved the conductor and has impaired easily and anticorrosive problem, when guaranteeing the electrically conductive ground connection performance, has good corrosion protection, has reduced the copper product consumption, and the cost reduction reaches more than 50%; water or other resistance reducing agents are conveyed through the drainage guide pipe to humidify or reduce the resistance of the soil around the grounding device, so that the humidity of the soil is stably kept, the grounding resistance is reduced and kept stable, and the grounding resistance is lower than 0.5 omega, so that an excellent grounding effect is achieved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

As shown in fig. 1, a lightning-protection high-reliability grounding cable comprises an inner conductor 1 positioned in the center of the cable, wherein the inner conductor is formed by twisting copper-clad steel monofilaments, the diameter of each copper-clad steel monofilament is not less than 2.50mm, and the thickness of a copper layer is 0.290-0.310 mm, so that the problems that the conductor is easy to damage and is corrosion-resistant are solved; the strength and reliability of the grounding cable conductor are ensured; the environment-friendly polypropylene insulating layer 2 with the thickness more than or equal to 2.0mm is extruded outside the inner conductor, the coaxial conductor 3 is wrapped outside the environment-friendly polypropylene insulating layer, the coaxial conductor is formed by winding copper-clad steel monofilaments, the diameter of each copper-clad steel monofilament is not less than 2.50mm, the thickness of a copper layer is 0.290-0.310 mm, and the problems that the conductor is easy to damage and is anticorrosive are solved; the strength and reliability of the grounding cable conductor are ensured; the sectional area of the coaxial conductor is equal to that of the inner conductor and is more than or equal to 150 square; the drainage catheters 4 are symmetrically arranged along two sides of the outer edge of the coaxial conductor respectively, water or other resistance reducing agents are conveyed through the drainage catheters to humidify or reduce the resistance of the soil around the grounding device, the soil humidity is stably kept, the grounding resistance is reduced and kept stable, the grounding resistance is lower than 0.5 omega, and an excellent grounding effect is achieved; an environment-friendly polyethylene outer sheath 5 is extruded outside the coaxial conductor and the two drainage catheters together, the environment-friendly polyethylene outer sheath is oval, and the thickness of the thinnest part is not less than 1.5 mm.

Firstly, selecting 30 annealed copper-clad steel monofilaments (the thickness of a copper layer is 0.30 mm) with the diameter of 2.52mm, stranding the monofilaments by a JKL630-54 type frame stranding machine, and preparing a 150-square conductor (1) by adopting a compact nano mold; extruding a layer of environment-friendly polypropylene insulation (2) with the thickness of 2.1mm on the surface of the conductor by using a J120 type extruder set; selecting 30 annealed copper-clad steel monofilaments with the diameter of 2.50mm (the thickness of copper layers of the annealed copper-clad steel monofilaments is 0.30 mm), and winding the annealed copper-clad steel monofilaments on an insulator by a JK60 type tensile armor machine to form a coaxial conductor (3); winding the drainage catheter (4) outside the coaxial conductor (3) by using a JC1250 type cabling machine; finally, an XJ150 type extruder is used for extruding an environment-friendly polyethylene sheath on the outermost surface, and the thickness of the thinnest part of the sheath is not less than 1.5 mm.

The ground cable produced in the above way is subjected to the following procedures according to the No. 4 of the national standard GB/T3048.4-2007 Electrical Performance test methods of electric wires and cables: testing the conductor direct current resistance test, wherein the direct current resistance value is 0.198 omega/km when the test result is 20 ℃; the technical requirements of the resistance of the grounding cable are met;

insulation resistance was measured according to GB/T3048.5-2007 test method for Electrical Properties of electric wire and Cable, part 5: testing by an insulation resistance test, wherein the detection result shows that the insulation resistance is 150 MOmega at ambient temperature and 15.2 MOmega at 90 ℃; meets the requirements.

The AC voltage test is carried out according to GB/T3048.8 electric property test method of wires and cables part 8: and an alternating voltage test is carried out, and the detection result is that the breakdown is not caused at 3.5Kv/5min, thereby meeting the requirement.

Other performances of the cable are detected according to related national standards and all meet the requirements.

The utility model discloses an earth cable uses in tin-free city yixing economy development area A-D012 building ground system, according to GB50057-2010 "building lightning protection design specification", the regulation of GB/T50065-2011 "ground design specification of alternating current electrical equipment" and test earth cable and ground system according to GB/T17949.1-2020 "ground resistance measurement rule of leading", ground resistance is 0.43 omega, accord with GB 50169 and give good care of 'electric installation engineering earthing device construction and acceptance criterion 2016' completely, accord with the requirement of national relevant standard, compare with original earth cable, reduce cost reaches 51%, gain good effect.

The utility model discloses the concrete application way is many, and the above-mentioned only is the preferred embodiment of the utility model, should point out, to ordinary skilled person in this technical field, under the prerequisite that does not deviate from the utility model discloses the principle, can also make a plurality of improvements, and these improvements also should be regarded as the utility model discloses a scope of protection.

Claims (7)

1. The utility model provides a high reliable earthing cable of lightning protection which characterized in that: the cable comprises an inner conductor positioned in the center of the cable, wherein an environment-friendly polypropylene insulating layer is extruded outside the inner conductor, a coaxial conductor is wrapped outside the environment-friendly polypropylene insulating layer, and the sectional area of the coaxial conductor is equal to that of the inner conductor; and the drainage catheters are symmetrically arranged along two sides of the outer edge of the coaxial conductor respectively, and the environment-friendly polyethylene outer sheath is extruded outside the coaxial conductor and the two drainage catheters together.

2. The lightning protection high reliability grounding cable of claim 1 wherein: the inner conductor is formed by twisting copper-clad steel monofilaments, the diameter of each copper-clad steel monofilament is not less than 2.50mm, and the thickness of a copper layer is 0.290-0.310 mm.

3. The lightning protection high reliability grounding cable of claim 1 wherein: the coaxial conductor is formed by winding copper-clad steel monofilaments, the diameter of each copper-clad steel monofilament is not less than 2.50mm, and the thickness of a copper layer is 0.290-0.310 mm.

4. The lightning protection high reliability grounding cable of claim 1 wherein: the sectional area of the inner conductor and the coaxial conductor is more than or equal to 150 square.

5. The lightning protection high reliability grounding cable of claim 1 wherein: the thickness of the environment-friendly polypropylene insulating layer is more than or equal to 2.0 mm.

6. The lightning protection high reliability grounding cable of claim 1 wherein: the drainage catheter is a polypropylene fiber braided reinforced hose; the diameter of the drainage catheter is 0.5-1 times of the diameter of the inner conductor.

7. The lightning protection high reliability grounding cable of claim 1 wherein: the environment-friendly polyethylene outer sheath is oval, and the thickness of the thinnest part is not less than 1.5 mm.

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