CN-121331553-B - Molded line conductor crosslinked polyethylene insulation medium-voltage power cable

CN121331553BCN 121331553 BCN121331553 BCN 121331553BCN-121331553-B

Abstract

The invention relates to the technical field of power cables and provides a molded line conductor crosslinked polyethylene insulation medium-voltage power cable which comprises a cable main body, wherein the cable main body comprises a plurality of conductors which are in stranded arrangement, a crosslinked polyethylene insulation layer is coated and arranged outside each conductor, a fireproof mica layer is arranged between the outside of each conductor and the crosslinked polyethylene insulation layer, a wrapping layer, a sheath structure, an air guide hose and an air guide assembly are further arranged outside the plurality of conductors, a filling layer is arranged between the inside of the wrapping layer and a plurality of conductors, the sheath structure is arranged outside the wrapping layer, a plurality of air guide hoses are arranged inside the filling layer, and two air guide assemblies are arranged inside the filling layer.

Inventors

LUO JIANPENG
CAO ZHU
GAO LOU
ZHANG LEI
WANG CHUNMIAO
WANG JINMEI

Assignees

金峰电缆有限公司

Dates

Publication Date: 20260512
Application Date: 20251016

Claims (8)

1. The utility model provides a insulating middling pressure power cable of molded line conductor crosslinked polyethylene, includes the cable main part, the cable main part includes many conductor (1) of transposition arrangement, every the outside all cladding of conductor (1) is provided with crosslinked polyethylene insulating layer (2), every the conductor (1) outside with all be provided with fire-resistant mica layer (3) between crosslinked polyethylene insulating layer (2), its characterized in that still includes: The winding layers (4) are arranged outside the plurality of conductors (1), the winding layers (4) are arranged inside the winding layers (4) and filling layers (5) are arranged between the plurality of conductors (1); A sheath structure arranged outside the wrapping layer (4) for protecting the power cable; the sheath structure comprises an outer sheath layer (9); The air guide hoses (6) are arranged in the filling layer (5), and the air guide hoses (6) are in one-to-one correspondence with the conductors (1) and staggered; the air guide assemblies are provided with two air guide hoses (6), and the air guide hoses (6) are positioned between the two air guide assemblies and used for enabling air to flow in the air guide hoses (6); the air guide assembly includes: The two ends of the cable main body are provided with the air guide cylinders (10), and one sides of the two air guide cylinders (10) close to the power cable are communicated with a plurality of air guide connectors (11) at equal angles in a circumferential shape; a communicating pipe (12), wherein one side of the two air guide cylinders (10) far away from the cable main body is communicated with the communicating pipe (12); the heat dissipation assembly is arranged on the sheath structure and used for dissipating heat of the sheath structure; the heat dissipation assembly includes: the heat dissipation ring frames are equidistantly arranged outside the outer sheath layer (9), and each heat dissipation ring frame consists of an upper positioning ring (18) and a lower positioning ring (19); The air inlet parts are arranged among the plurality of lower positioning rings (19) and used for conveying air into the heat dissipation ring frame; The air inlet portion includes: the three-way connectors (23) are communicated with each lower positioning ring (19); The air supply assembly is used for conveying air for the air guide assembly and the heat dissipation assembly; The air supply assembly includes: The air blower (25), the output end of the air blower (25) is communicated with an air supply barrel (26), and one side of the air supply barrel (26) far away from the air blower (25) is communicated with a plurality of conveying connectors (27); wherein the blower (25) is located near the end of the cable body; A delivery pipe (28), wherein the delivery pipe (28) is communicated with the three-way joint (23) close to the blower (25), and the delivery pipe (28) is communicated with one of the delivery joints (27); Of the two communicating pipes (12), the communicating pipe (12) close to the blower (25) is communicated with one of the delivery joints (27), and the other communicating pipe (12) is communicated with the three-way joint (23) far from the blower (25).
2. The molded line conductor crosslinked polyethylene insulated medium voltage power cable according to claim 1, wherein the sheath structure comprises an inner liner (7), the inner liner (7) is wrapped and arranged outside the wrapping layer (4), an armor layer (8) is wrapped and arranged outside the inner liner (7), and the outer sheath layer (9) is wrapped and arranged outside the armor layer (8).
3. The insulated medium voltage power cable of claim 2, wherein the air guide assembly further comprises: the connector is arranged at two ends of the cable main body and used for connecting electrical equipment; Wherein, a plurality of air guide hose (6) respectively with a plurality of air guide joint (11) one-to-one, a plurality of air guide hose (6) one end respectively with a plurality of on one of them air guide cylinder (10) air guide joint (11) intercommunication, a plurality of air guide hose (6) the other end respectively with another a plurality of on air guide cylinder (10) air guide joint (11) intercommunication.
4. A wire conductor crosslinked polyethylene insulated medium voltage power cable according to claim 3, wherein said joint portion comprises: The two heat-shrinkable finger sleeves (13) are arranged outside the two air guide cylinders (10), the heat-shrinkable finger sleeves (13) comprise a main body part (1301), a first finger sleeve (1302) and a second finger sleeve (1303), the two heat-shrinkable finger sleeves (13) are respectively positioned at two ends of the cable main body, and the main body parts (1301) of the two heat-shrinkable finger sleeves (13) are respectively coated and arranged at two ends of the outer sheath layer (9); Each heat-shrinkable finger sleeve (13) is provided with a plurality of first finger sleeves (1302), the first finger sleeves (1302) are respectively in one-to-one correspondence with the conductors (1), and the first finger sleeves (1302) are coated and arranged on the crosslinked polyethylene insulating layer (2); wherein each heat-shrinkable finger sleeve (13) is provided with a second finger sleeve (1303), and the second finger sleeves (1303) are coated and arranged on the communicating pipe (12); the two ends of the conductors (1) are fixedly provided with the wiring terminals (14); and the thermal shrinkage jackets (15) are respectively coated and arranged between each wiring terminal (14) and the corresponding crosslinked polyethylene insulating layer (2).
5. A molded line conductor crosslinked polyethylene insulated medium voltage power cable according to claim 4, characterized by further comprising: the binding belt layers (16) are arranged on one sides, close to the cable main body, of the two air guide cylinders (10), the binding belt layers (16) are positioned outside the conductors (1), and the binding belt layers (16) are in contact with the crosslinked polyethylene insulating layer (2); The support sleeve (17) is arranged outside the two binding band layers (16), the support sleeve (17) is arranged outside the two binding band layers, and the outer side face of the support sleeve (17) is in contact with the inner part of the main body part (1301) of the heat-shrinkable finger sleeve (13).
6. The insulated medium voltage power cable of claim 5, wherein the heat dissipating assembly further comprises: The butt joint device comprises butt joint protrusions (20) and butt joint grooves (21), wherein the butt joint protrusions (20) are arranged at two ends of the bottom of each upper positioning ring (18), and the butt joint grooves (21) are arranged at positions, corresponding to the lower positioning rings (19), of the two butt joint protrusions (20) at the bottom of each upper positioning ring (18); Wherein, each upper positioning ring (18) and each lower positioning ring (19) are internally provided with a hollow structure; and the exhaust parts are arranged on each upper positioning ring (18) and each lower positioning ring (19) and are used for exhausting air.
7. The insulated medium voltage power cable according to claim 6, wherein the exhaust part comprises ventilation slots (22), a plurality of ventilation slots (22) are formed on two sides of each upper positioning ring (18) at equal angles in an arc shape, and a plurality of ventilation slots (22) are formed on two sides of each lower positioning ring (19) at equal angles in an arc shape.
8. The insulated medium voltage power cable of claim 7, wherein the air inlet further comprises: and the air supply pipes (24) are communicated between every two adjacent three-way joints (23), and the air supply pipes (24) are communicated.

Description

Molded line conductor crosslinked polyethylene insulation medium-voltage power cable Technical Field The invention relates to the technical field of power cables, in particular to a molded line conductor crosslinked polyethylene insulated medium-voltage power cable. Background The molded line cable is a medium voltage cable (referring to a power cable with rated voltage between 6 kilovolts and 35 kilovolts), is commonly applied to various fields such as urban power distribution, rural power grids, mining power systems, rail transit systems and the like, and is different from a common round single-wire conductor, namely, a single strand copper wire inside the cable is round, when a plurality of round single wires are extruded together, a quite obvious gap exists, and the molded line cable is generally adopted in order to make the whole cable more compact. The molded lines in the molded line cable are conductors with different geometric shapes which are manufactured for meeting different requirements, in the production process, a plurality of copper or aluminum monofilaments are generally drawn to form different combination shapes such as trapezoids or rectangles, and then the conductors are stranded into the conductors, so that the conductor stranded structure is more compact, the monofilament splicing gaps are extremely small, the cable structure is more compact, and compared with a cable with a round conductor, the molded line cable has smaller conductor outer diameter and saves more pipeline space under the same sectional area. When cabling is carried out in areas such as a community and an industrial park, for example, when power at a power supply end is required to be transmitted to a power utilization end, a cable trench is used, when cabling is carried out, two ends of a cable are led up at a starting point position and an end point position of the cable trench to be manufactured into terminal ends, then the terminal ends are connected to electric equipment at the two ends respectively, when cabling is carried out in the cable trench, the cable is generally laid on a cable bridge of the cable trench, a plurality of cables are generally laid in the cable trench in a concentrated mode, because the cables in the cable trench are very dense, the cables are generally arranged on a support in a layered mode, a large amount of cables generate heat simultaneously in the working process, the power is high, ventilation failure in a closed tunnel is caused, the heat dissipation temperature difference is small, meanwhile, the natural air flow is influenced due to relative limitation, heat accumulation is caused, the current carrying capacity is reduced, the insulation service life is also influenced, the external heat dissipation measures are often low, and the heat dissipation of a heating area of a cable inner conductor is difficult to effectively dissipate heat. Disclosure of Invention The invention provides a molded line conductor crosslinked polyethylene insulated medium-voltage power cable, which is used for solving the problems that the heat dissipation of the cable is limited due to the dense arrangement of the cables in a cable pit, so that the current-carrying capacity of the cable is reduced and the insulation service life is influenced in the prior art. The technical scheme of the invention is as follows: the utility model provides a insulating middling pressure power cable of molded line conductor crosslinked polyethylene, includes the cable main part, the cable main part includes the conductor that many transposition were arranged, every the outside all cladding of conductor is provided with crosslinked polyethylene insulating layer, every outside of conductor with all be provided with fire-resistant mica layer between the crosslinked polyethylene insulating layer, still include: The wrapping layers are arranged outside the plurality of conductors, and filling layers are arranged between the inside of the wrapping layers and the plurality of conductors; the sheath structure is arranged outside the wrapping layer and used for protecting the power cable; The air guide hoses are arranged in the filling layer, correspond to the conductors one by one and are staggered; The air guide assemblies are provided with two air guide hoses, and the air guide hoses are positioned between the two air guide assemblies and used for enabling air to flow in the air guide hoses; the heat dissipation assembly is arranged on the sheath structure and used for dissipating heat of the sheath structure; And the air supply assembly is used for conveying air for the air guide assembly and the heat dissipation assembly. On the basis of the scheme, the sheath structure comprises: The inner liner layer is coated and arranged outside the wrapping layer, and an armor layer is coated and arranged outside the inner liner layer; the armor outside cladding is provided with the oversheath layer. On the basis of the scheme, the air guide