CN216487467U - Non-armored medium-high voltage composite shielded cable - Google Patents

Abstract

The utility model relates to a well high tension cable technical field particularly relates to compound shielded cable of high voltage in non-armor type, include: the three cable cores are wound with the lapped tapes in a pairwise tangent mode to form a conductive unit with a circular section; the filling layer is filled between the cable insulation wire core and the wrapping tape; the metal shielding layer is wrapped on the outside of the wrapping tape in a loose mode; and the outer sheath is extruded and wrapped on the outer side of the metal shielding layer. The conductor core comprises a round single wire and molded lines which are stranded on the outer side of the wire core in multiple layers, the molded lines can be fastened tightly in the positive direction and the negative direction, so that the whole conductor core is more compact, gaps are smaller, the compactness between the section shape and the molded lines can be still kept in a bending state, the molded lines do not need to be compressed after being stranded, the flexibility of the material is kept, the molded lines cannot crack in the bending state, and the probability that the cable is subjected to discharge breakdown insulation of the guide core due to bending can be greatly reduced.

Description

Non-armored medium-high voltage composite shielded cable

Technical Field

The utility model relates to a well high tension cable technical field particularly relates to compound shielded cable of high voltage in non-armor type.

Background

The medium-high voltage power cable is mainly used for transmission and distribution cables in power systems of various voltage levels, wherein the medium-voltage cable is mainly a distribution cable, and the high-voltage and ultrahigh-voltage cables are mainly transmission cables, are suitable for being laid indoors, in tunnels and cable ducts or directly buried underground, and can bear certain mechanical external force and certain tensile force.

The existing medium-high voltage cable is usually provided with only one metal shielding layer, and when a system is in short circuit, the metal shielding layer is used as a channel for short-circuit current and plays a role of shielding an electric field, and when a shielding belt is disconnected or leaks, the grounding circuit is often broken; in addition, the conducting core is generally formed by twisting a plurality of conducting wires, but gaps exist among the conducting wires, so that the diameter of the conducting core is increased, the gaps between the conducting wires and the insulation are large, air gap discharge can be generated in the cable running process, and the insulation can be broken down after long-term use, so that the conducting wires in a twisting process are generally compressed at present to reduce the outer diameter of the conducting core and the gaps between the conducting wires, but the hardness of the compressed cable is increased, and the gaps among the conducting wires can still be increased in a bending state, so that the insulation of the bending part is easy to damage.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects of the prior art, a non-armored medium-high voltage composite shielded cable is provided, include: the lapped tapes which are tangent to each other in pairs are wound to form a conductive unit with a circular section; the filling layer is filled between the cable core and the wrapping tape; the metal shielding layer is wrapped on the outside of the wrapping tape in a loose mode; the outer sheath is extruded and wrapped on the outer side of the metal shielding layer;

the cable insulation wire core comprises a conductor core and an insulation structure arranged on the outer side of the conductor core, the conductor core comprises a round single wire and molded lines which are stranded on the outer side of the wire core in multiple layers, the two groups of molded lines which are opposite in the positive direction and the negative direction along the radial direction are taken as one layer, the two groups of molded lines on each layer are distributed in the circumferential direction of the wire core in a staggered mode, so that the molded lines on each layer are buckled with each other in the circumferential direction of the wire core, and the cross section of each molded line is in a circular shape which can enable the molded lines on each layer to be buckled with each other.

Further, the insulating layer comprises a conductor shielding layer, an insulating shielding layer and a metal shielding layer which are arranged on the outer side of the conductor core in sequence.

Furthermore, the conductor shielding layer and the insulation shielding layer are extruded by adopting a semiconductor shielding material, and the insulation layer is extruded by adopting an XLPE (cross linked polyethylene).

Furthermore, the metal shielding layer is wrapped by a nano aluminum alloy belt.

Furthermore, each layer of molded lines are mutually buckled and twisted to form a pipe body with smooth surface wall.

Furthermore, one side of the molded line is provided with an inwards concave molded line groove, and two sides of the molded line groove form a convex buckling part.

Furthermore, the cross section of the molded line is Z-shaped, C-shaped or trapezoidal.

Furthermore, a concave first profile line groove is formed in the middle of one side of the profile line, convex buckling parts are formed on two sides of the first profile line groove, and the cross sections of the two buckling parts are complementary to the cross section of the first profile line groove in shape.

Furthermore, an inwards concave second profile groove is formed in the middle position of one side of the profile, and convex buckling parts are formed on two sides of the second profile groove.

Furthermore, the width of the second profile groove is equal to the width of the two buckling parts, and the depth of the second profile groove is greater than that of the buckling parts.

Compared with the prior art, the utility model has the advantages of:

the utility model discloses a well high voltage composite shielded cable is through setting up the molded lines that roughly is "Z" font, "C" font, make the molded lines can be just, the inseparable lock joint of opposite direction each other, it is limited to draw each other in week, it is whole compacter to make the conductor core, the gap between the molded lines is littleer, and still can keep the compactedness between cross sectional shape and the molded lines under the state of buckling, and the molded lines need not compress tightly technology after the transposition, the flexibility of retained material itself, can not ftracture under the state of buckling, can reduce the cable and lead the core to discharge and puncture insulating probability emergence because of buckling to a great extent.

Drawings

Fig. 1 is a schematic perspective view of a non-armored medium-high voltage composite shielded cable according to an embodiment of the present invention;

fig. 2 is a schematic view of a layered structure of a non-armored medium-high voltage composite shielded cable according to an embodiment of the present invention;

fig. 3 is a schematic view of a hierarchical structure of a conductor core in a non-armored medium-high voltage composite shielded cable according to an embodiment of the present invention;

fig. 4a is a schematic view of a fastening structure of the molded line of the unarmored medium-high voltage composite shielded cable according to the embodiment of the present invention;

fig. 4b is a schematic view of another fastening structure of the non-armored medium-high voltage composite shielded cable according to the embodiment of the present invention.

Detailed Description

For a better understanding of the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

The existing medium-high voltage cable has the problems that the hardness of the conductive core is increased and the overall flexibility of the cable is reduced due to the fact that the conductive core is produced by a stranding and pressing process, the cable is inevitably required to be bent in a laying process, the existing wires are round wires and are not mutually drawn, so that the extrusion gap between the wires on the outer diameter side is increased in a bending state, an air gap is generated, cracks can appear on the surface of a conductor of the wire with high hardness under the bending condition, electric branches are formed and are factors causing insulation breakdown, and therefore a product which is expected by a user needs to ensure that the wire is compact and does not lose flexibility.

Combine fig. 1-fig. 3 to show, an object of the utility model is to provide a compound shielded cable of high voltage in non-armor type, have lead the compact and compromise flexible characteristics of core, can still keep the relative compact state between the wire under the condition of buckling to reduce the cable and lead the core to discharge and puncture insulating probability emergence because of buckling, compound shielded cable of high voltage mainly includes cable insulation sinle silk 1 in the non-armor type, filling layer 2, around band 3, package metallic shield 4 and oversheath 5.

The cable insulation core 1 comprises a conductor core 11 and an insulation structure arranged outside the conductor core 11.

Specifically, the conductor core 11 includes a circular single line 111 and a plurality of layers of molded lines 112, two sets of molded lines 112 opposite to each other in the radial direction are taken as one layer, the two sets of molded lines 112 in each layer are distributed in a staggered manner in the circumferential direction of the circular single line 111, so that the molded lines 112 in each layer are fastened to each other in the circumferential direction of the circular single line 111, and the cross-sectional shape of the molded lines 112 is a cross-sectional shape that enables the molded lines 112 in each layer to be fastened and twisted to form a circular ring.

In an alternative embodiment, the round single wires 111 and the round molded wires 112 are made of high-conductivity aluminum alloy conductor material, and the high-conductivity alloy conductor has excellent electrical conductivity, creep resistance, thermal conductivity and corrosion resistance.

In a preferred embodiment, the round single wire 111 is a conductor with a round section, and is disposed at the axial center of the whole cable, the section of the molded line 112 is in a "Z" shape, a "C" shape or a trapezoid shape, and is stranded outside the round single wire 111 in multiple layers, so that each layer of molded line 112 is fastened and stranded with each other to form a tube with a smooth surface.

Further, the molded lines 112 form a multi-layer concentric tube body outside the circular single line 111, each layer of tube body is formed by twisting a plurality of molded lines 112 fastened to each other, and the molded lines 112 on the same layer are fastened to each other in the circumferential direction in a forward and reverse manner, so that the molded lines 112 are limited by being mutually pulled in the circumferential direction, and even in a bent state, gaps are not generated due to loosening, and the shapes of the molded lines 112 can be fastened to each other seamlessly.

Therefore, the conductor core 11 is more compact as a whole, the gap between the molded lines 112 is smaller, the compactness between the section shape and the molded lines 112 can be still kept under the bending state, the molded lines 112 do not need to be compressed after being twisted, the flexibility of the material is kept, the molded lines cannot crack under the bending state, and the probability that the cable is subjected to core-guide discharge breakdown insulation due to bending can be reduced to a greater extent.

Further, one side of the molded line 112 has a concave molded line 112 groove, and two sides of the molded line 112 groove form a convex buckling part, so that the molded lines 112 in the shape of a substantially "C" can be tightly buckled with each other in the forward and backward directions, and the molded lines 112 can be pulled and limited in the circumferential direction, so that the conductor core 11 cannot be loosened even in a bent state.

In an alternative embodiment, as shown in fig. 4a, in order to make the entire conductor core 11 more compact, a concave first profile groove 1121a is formed in a middle position on one side of the profile 112, protruding buckling portions are formed on two sides of the first profile groove 1121a, and cross sections of the two buckling portions are complementary to cross sections of the first profile groove 1121a, so that a filling coefficient of the conductor core 11 can reach above 0.95, an outer diameter of the cable can be made small, a compression process is not required, and flexibility of the conductor is maintained.

In an alternative embodiment, as shown in fig. 4b, in order to make the conductor core 11 more flexible, a concave second type wire groove 1121b is formed at a middle position of one side of the molded line 112, protruding buckling parts are formed at two sides of the second type wire groove 1121b, a width of the second type wire groove 1121b is equal to widths of the two buckling parts, and a depth of the second type wire groove 1121b is greater than a depth of the buckling part, so that the molded line 112 has a certain compression space in a radial direction, and when an extrusion force is large, the buckling part can be extruded to a middle position of the second type wire groove 1121b to deform and contract the buckling part, thereby preventing the outer wall of the conductor from cracking.

As shown in fig. 3, the insulating structure includes a conductor shield layer 12, an insulating layer 13, an insulating shield layer 14, and a metal shield layer 15, which are sequentially disposed outside the conductor core 11.

The conductor shielding layer 12, the insulating layer 13 and the insulating shielding layer 14 are formed by three-layer co-extrusion processing, the metal shielding layer 15 is wrapped by a nano aluminum alloy belt, and the nano aluminum alloy belt replaces a copper belt, so that the weight is light and the price is low.

With reference to fig. 1, the three cable insulated wire cores 1 are designed, and are wound with wrapping tapes 3 in a tangent manner in pairs, so that a conductive unit with a circular section is manufactured.

The filling layer 2 is filled between the cable insulation core 1 and the wrapping tape 3, and a halogen-free filling layer can be adopted.

The metal shielding layer 4 is wrapped on the wrapping tape 3 in a sparse way.

The outer sheath 5 is extruded outside the metal shielding layer 4.

Therefore, the composite shielding formed by the metal shielding layer 15 outside the insulated wire core and the metal shielding layer 4 outside the cable core can play a double-layer protection role, and when one layer is broken, the other layer can provide a grounding channel during short circuit; in addition, the shielding effect of the double shielding layers is better.

The wrapping tape 3 is made of a water-blocking tape or a flame-retardant tape according to use requirements, the filling layer 2 is made of a filling rope or a soft filling strip, the cable is ensured to be round, the metal shielding layer 4 is wrapped, and a plurality of copper wires or aluminum alloy wires are uniformly and sparsely wound on the outer side of the wrapping tape 3; the outer sheath 5 can be made of flame-retardant PVC outer sheath or low-smoke halogen-free flame-retardant polyolefin material, and has the effects of flame retardance and environmental protection.

By combining the above embodiments, by providing the approximately C-shaped molded lines 112, the molded lines 112 can be fastened tightly in the forward and backward directions, and can be pulled and limited mutually in the circumferential direction, so that the conductor core 11 is more compact as a whole, the gaps between the molded lines 112 are smaller, and the sectional shape and the compactness between the molded lines 112 can be still maintained in the bent state, and the molded lines 112 do not need a pressing process after twisting, so that the flexibility of the material is maintained, and the cable does not crack in the bent state, and the probability of the lead core discharge breakdown insulation caused by bending of the cable can be reduced to a greater extent.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The present invention is intended to cover by those skilled in the art various modifications and adaptations of the invention without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention is subject to the claims.

Claims (7)

1. The utility model provides a compound shielded cable of high voltage in non-armoured type which characterized in that includes:

the cable comprises a plurality of cable insulated wire cores, a plurality of cable insulated wire cores and a plurality of winding tapes, wherein the cable insulated wire cores are wound with wrapping tapes in a pairwise tangent mode to form a conductive unit with a circular section;

the filling layer is filled between the cable insulation wire core and the wrapping tape;

the metal shielding layer is wrapped on the outside of the wrapping tape in a loose mode;

the outer sheath is extruded and wrapped on the outer side of the metal shielding layer;

the cable insulation wire core comprises a conductor core and an insulation structure arranged on the outer side of the conductor core, wherein the conductor core comprises a round single wire and molded lines which are stranded on the outer side of the wire core in multiple layers, two groups of molded lines which are opposite in the positive direction and the negative direction along the radial direction are taken as one layer, and the two groups of molded lines on each layer are distributed in a staggered mode in the circumferential direction of the wire core so that the molded lines on each layer are buckled with each other in the circumferential direction of the wire core;

the cross-sectional shape of the molded lines is set to enable each layer of the molded lines to be mutually buckled and twisted to form the cross-sectional shape of a circular ring.

2. The unarmored medium-high voltage composite shielded cable according to claim 1, wherein the insulation structure comprises a conductor shielding layer, an insulation shielding layer and a metal shielding layer which are sequentially arranged outside the conductor core.

3. The unarmored medium-high voltage composite shielded cable according to claim 2, wherein the metal shielding layer is wrapped with a nano aluminum alloy tape.

4. The unarmored medium-high voltage composite shielded cable according to claim 1, wherein each layer of wires is twisted and fastened to each other to form a tube with a smooth surface.

5. The unarmored medium-high voltage composite shielded cable according to claim 4, wherein one side of the molded line has a concave molded line groove, and both sides of the molded line groove form a convex buckling part.

6. The unarmored medium-high voltage composite shielded cable according to claim 4, wherein the cross-sectional shape of the molded line is zigzag, C-shaped or trapezoid.

7. The unarmored medium-high voltage composite shielded cable according to claim 4, wherein a concave first molded line groove is formed in the middle of one side of the molded line, protruding buckling parts are formed on two sides of the first molded line groove, and the cross sections of the two buckling parts are complementary to the cross section of the first molded line groove.

Images