CN210925582U

CN210925582U - Rural power grids reforms transform and uses ultraviolet resistance aerial [ insulated ] cable

Info

Publication number: CN210925582U
Application number: CN201921863115.8U
Authority: CN
Inventors: 吴惠明
Original assignee: DONGGUAN MINXING CABLES CO LTD
Current assignee: DONGGUAN MINXING CABLES CO LTD
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-07-03
Anticipated expiration: 2029-10-31

Abstract

The utility model relates to a rural power grids of difficult electric leakage are reformed transform and are used ultraviolet resistance aerial [ insulated ] cable, including black polyolefin sheath, shielding layer, steel core and stranded aluminum strand wires, each strand of aluminum strand wires is jointly around the hank in the steel core outside and by the shielding layer cladding that ground connection set up, black polyolefin sheath cladding is in the shielding layer outside, each strand of aluminum strand wires has the flame retardant coating from inside to outside in proper order after the hank, an inner insulating layer for electrical insulation, inner insulating layer is located the shielding layer inboard, the cladding has the subsides to locate the inboard water blocking layer that just absorbs water inflation of black polyolefin sheath between shielding layer and the black polyolefin sheath.

Description

Rural power grids reforms transform and uses ultraviolet resistance aerial [ insulated ] cable

Technical Field

The utility model relates to an ultraviolet resistance aerial [ insulated ] cable is used in rural power grids transformation.

Background

The core part of the existing aerial cable is a steel-cored aluminum strand, wherein the steel core plays a role in increasing strength, the aluminum strand plays a role in transmitting electric energy, the outer side of the aluminum strand is simply coated with a shielding layer and an insulating layer, and under the condition that the insulating layer is damaged due to external force or time action, a current leakage event easily occurs, and serious accidents can be caused if rainstorm weather occurs.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an improve the weak point among the prior art, and provide the rural power grids that is difficult for the electric leakage and reforms transform and use ultraviolet resistance aerial [ insulated ] cable.

Therefore, the ultraviolet-resistant aerial cable for rural power grid transformation comprises a black polyolefin sheath, a shielding layer, a steel core and a plurality of strands of aluminum strands, wherein the strands of aluminum strands are jointly wound and twisted on the outer side of the steel core and are coated by the shielding layer arranged in a grounding mode, the black polyolefin sheath is coated on the outer side of the shielding layer, the strands of aluminum strands are sequentially coated with a fire-resistant layer and an inner insulating layer for electrical insulation from inside to outside after being wound and twisted, the inner insulating layer is located on the inner side of the shielding layer, and a water-resistant layer which is attached to the inner side of the black polyolefin sheath and is water-swelling is coated between the shielding layer and the black polyolefin sheath.

Further, the shielding layer is specifically a tinned copper wire with the whole braided back surface being tin-dipped.

Furthermore, the material of the inner insulating layer is XLPE.

Further, the water-blocking layer is specifically a water-blocking yarn.

Furthermore, the fire-resistant layer is specifically a mica tape, and each strand of aluminum stranded wire is directly wrapped by the mica tape.

Further, the steel core is formed by mutually twisting a plurality of steel wires.

Has the advantages that:

the utility model discloses utilize black polyolefin sheath to realize the ultraviolet resistance, through setting up the water swelling's that absorbs water layer in black polyolefin sheath inboard, when the unexpected damage of outer insulating layer, if there is moisture content to invade, but the yarn that blocks water absorbs water swelling formation gel form material, block the infiltration passageway on the outer insulating layer, thereby prevent the moisture invasion, because the water blocking layer inboard has the inner insulating layer, the electric passageway between infiltration passageway and the steel-cored aluminum stranded conductor is by the inner insulating layer separation, the event can prevent the external electric leakage of cable, in addition because the inner insulating layer is inboard at the shielding layer, the shielding layer can form metal protection to the inner insulating layer, prevent its atress damage.

The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 shows a schematic cross-sectional structure diagram of the overhead cable of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The overhead cable of the embodiment is used for transmitting electric power, the cross-sectional structure of the overhead cable is shown in fig. 1, the core of the overhead cable is an aluminum steel-cored stranded wire 2, the steel core 1 is formed by mutually twisting a plurality of steel wires so as to increase the strength of the cable, the aluminum stranded wire 2 is also provided with a plurality of strands, and each strand of the aluminum stranded wire 2 is wound and twisted on the outer side of the steel core 1 together and is used for transmitting electric energy with rated voltage of 1-10 KV.

After each strand of aluminum stranded conductor 2 is twisted, wrap around as the flame retardant coating with mica tape 3, utilize the direct cladding aluminum stranded conductor 2 of the temperature resistant characteristic of mica tape 3 to bear the temperature rise that aluminum stranded conductor 2 transmitted heavy current and arouse, mica tape 3 still has the back-fire relief performance in addition, also can completely cut off external flame to a certain extent.

The mica tape 3 is coated with an inner insulating layer 4, and the inner insulating layer 4 is made of XLPE materials, mainly plays a role in electrical insulation and is used for preventing the aluminum stranded wire 2 from leaking electricity outwards.

The cladding has shielding layer 5 that the ground connection set up in the 4 outside of inner insulating layer, and shielding layer 5 weaves the whole wicking of rear surface by the tinned wire and makes, and its cladding is in the 4 outsides of inner insulating layer, mainly plays two effects here: firstly, forming metal protection to resist external force impact to a certain extent, so that the inner insulating layer 4 is not easy to damage; secondly, because the surface of the braided cable is seamless (sealed) due to tin immersion after the braiding, the braided cable has good shielding performance similar to that of a semi-hard cable copper pipe, can form electrostatic shielding, avoids radiation to the outside, and has certain flexibility, thereby overcoming the defect of poor bending performance of the semi-hard cable copper pipe.

The shielding layer 5 outside from inside to outside in proper order cladding has the yarn 6 that blocks water and outer insulating layer 7, and wherein, the yarn 6 that blocks water is as the water blocking layer, and it has the characteristics that intensity of absorbing water is big, the expansion rate is high, can absorb water in the twinkling of an eye and make its volume expand to tens times of self, and when outer insulating layer 7 was unexpected damaged, if there was the infiltration of moisture content, the yarn 6 that blocks water inflation formation gelatinous material blocks the infiltration passageway on the outer insulating layer 7 to realize the effect of blocking water. The outer insulating layer 7 is a black polyolefin sheath which is arranged on the outermost side of the cable, on one hand, the electric insulation is realized, and more importantly, the ultraviolet resistance of the cable is utilized to prolong the aging time of the cable under the irradiation of outdoor ultraviolet rays so as to achieve the purpose of ultraviolet resistance.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. The utility model provides an ultraviolet resistance aerial [ insulated ] cable is used in rural power grids transformation, includes black polyolefin sheath, shielding layer, steel core and stranded aluminum stranded conductor, and each strand of aluminum stranded conductor is jointly around the hank in the steel core outside and by the shielding layer cladding that ground connection set up, black polyolefin sheath cladding in the shielding layer outside, its characterized in that: each strand of aluminum stranded wire is wrapped with a fire-resistant layer and an inner insulating layer for electrical insulation from inside to outside in sequence after being wound, the inner insulating layer is positioned on the inner side of the shielding layer, and a water-resistant layer which is attached to the inner side of the black polyolefin sheath and absorbs water to expand is wrapped between the shielding layer and the black polyolefin sheath.

2. The rural power grids reform transform and use ultraviolet resistance aerial [ insulated ] cable of claim 1, characterized in that: the shielding layer is specifically a tinned copper wire with the whole braided surface being tin-dipped.

3. The rural power grids reform transform and use ultraviolet resistance aerial [ insulated ] cable of claim 2, characterized in that: the inner insulating layer is made of XLPE.

4. The rural power grids reform transform and use ultraviolet resistance aerial [ insulated ] cable of claim 1 or 3, characterized in that: the water-resistant layer is specifically a water-resistant yarn.

5. The rural power grids reform transform and use ultraviolet resistance aerial [ insulated ] cable of claim 1, characterized in that: the fire-resistant layer is specifically a mica tape, and each strand of aluminum stranded wire is directly wrapped by the mica tape.

6. The rural power grids reform transform and use ultraviolet resistance aerial [ insulated ] cable of claim 1, characterized in that: the steel core is formed by mutually twisting a plurality of steel wires.