CN210925584U

CN210925584U - Medium-voltage three-core environment-friendly waterproof high-flame-retardant power cable

Info

Publication number: CN210925584U
Application number: CN201922013418.7U
Authority: CN
Inventors: 孟宪伟; 胡承伟; 赵亚超; 李明道
Original assignee: Zhejiang Wanma Co Ltd
Current assignee: Zhejiang Wanma Co Ltd
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-07-03
Anticipated expiration: 2029-11-20

Abstract

The utility model relates to a waterproof high fire-retardant power cable of medium-voltage three-core environment-friendly, the problem of prior art is solved in this practicality, and its technical scheme main points are: the method is characterized in that: the cable core package is established in outer two-sided water-blocking tape, outer two-sided water-blocking tape outsourcing is equipped with the nylon sheath, nylon sheath outsourcing is equipped with two-sided aluminum-plastic composite tape, the outside package of two-sided aluminum-plastic composite tape is equipped with interior low smoke and zero halogen fire-retardant polyolefin sheath, interior low smoke and zero halogen fire-retardant polyolefin sheath outsourcing is equipped with ceramic fire prevention fire-resistant composite tape, the outside package of ceramic fire prevention fire-resistant composite tape is equipped with high temperature fire prevention mud layer, the outside package of high temperature fire prevention mud layer is equipped with the glass fiber area, the outside package of glass fiber area is equipped with outer low smoke and zero halogen fire-retardant polyolefin sheath, the cable core includes three conductors, the outside of conductor all wraps and is equipped with the internal shield layer, the outside package of internal shield layer.

Description

Medium-voltage three-core environment-friendly waterproof high-flame-retardant power cable

Technical Field

The utility model belongs to a cable relates to a waterproof high flame retardant power cable of middling pressure three-core environment-friendly.

Background

In the application of electric power engineering, the cable is usually laid in a direct burial mode, a cable trench, a tunnel and the like, is difficult to avoid being in direct contact with water, and even can be partially soaked in the water. The common cross-linked polyethylene (XLPE) insulating material generates a water tree phenomenon after a cable runs for a period of time, and when the water tree grows to a certain degree, the cable insulating layer is punctured. After the aging of the XLPE insulated water tree is discovered in 1967, the aging of the XLPE insulated water tree is confirmed to be one of the main phenomena of the aging of the XLPE cable. Although the mechanism and how water branches cause damage is not completely understood at present, a large number of experimental data show that water branches cause local stress increase and may become the origin of electric branches. At high temperature, the inside of the water tree can be obviously oxidized, so that the water absorption is increased, the conductivity is increased, and finally the thermal breakdown is realized; even at low temperatures, water dendrites oxidize or convert to electrical dendrites over a long period of time, causing damage to the insulation. This will significantly shorten the life of the cable, especially when the cable is immersed in water for a long period of time. Therefore, cables laid in water environments generally require the cables to have a waterproof structure. The conventional flame-retardant cable adopts a sheath material added with a flame retardant, can only ensure that the cable runs for a certain time after a fire disaster occurs, and can generate toxic gas.

SUMMERY OF THE UTILITY MODEL

The utility model provides a prior art exist in the past flame retarded cable all adopt the sheath material to add the fire retardant, this kind of conventional flame retarded cable can only ensure to be the short time operation for a certain time after the conflagration takes place, but also can produce toxic gas's problem, provides a waterproof high flame retardant power cable of middling pressure three-core environment-friendly.

This practical technical scheme who adopts of solving its technical problem is: a medium-voltage three-core environment-friendly waterproof high-flame-retardant power cable comprises a cable core, wherein the cable core is wrapped in an outer double-sided water-blocking tape, a nylon sheath is wrapped outside the outer double-sided water-blocking tape, a double-sided aluminum-plastic composite tape is wrapped outside the nylon sheath, an inner low-smoke halogen-free flame-retardant polyolefin sheath is wrapped outside the double-sided aluminum-plastic composite tape, a ceramic fireproof and flame-retardant composite tape is wrapped outside the inner low-smoke halogen-free flame-retardant polyolefin sheath, a high-temperature fireproof mud layer is wrapped outside the ceramic fireproof and flame-retardant composite tape, a glass fiber tape is wrapped outside the high-temperature fireproof mud layer, an outer low-smoke halogen-free flame-retardant polyolefin sheath is wrapped outside the glass fiber tape, the cable core comprises three conductors, inner shielding layers are wrapped outside the conductors, insulating layers are wrapped outside the inner shielding layers, outer shielding layers are wrapped outside the insulating layers, the outer side of the semi-conductive water-blocking tape is wrapped with a copper strip, and the outer side of the copper strip is wrapped with an inner double-sided water-blocking tape. The utility model is suitable for an environment 35kV and below, the crowded one deck of fire layer that separates of fire prevention mud is crowded to present fire-retardant structure external use, and fire prevention mud itself belongs to the inorganic matter and can not arouse the conflagration, can not burn or combustion-supporting, more can not produce toxic gas, even have the burning at flame outward, the cable still can normally work, has prolonged the life of cable.

Preferably, the insulating layer is a water tree resistant insulating layer.

Preferably, the double-sided aluminum-plastic composite belt is longitudinally wrapped on the outer side of the nylon sheath.

Preferably, a water-blocking filling rope is filled in a gap between the inner double-sided water-blocking tape and the outer double-sided water-blocking tape.

Preferably, the radius of the conductor is larger than or equal to the sum of the thicknesses of the inner shielding layer, the insulating layer, the outer shielding layer, the semi-conductive water blocking tape, the copper tape and the inner double-sided water blocking tape.

The practical substantive effect is: the utility model is suitable for an environment 35kV and below, the crowded one deck of fire layer that separates of fire prevention mud is crowded to present fire-retardant structure external use, and fire prevention mud itself belongs to the inorganic matter and can not arouse the conflagration, can not burn or combustion-supporting, more can not produce toxic gas, even have the burning at flame outward, the cable still can normally work, has prolonged the life of cable.

Drawings

Fig. 1 is a schematic structural view of the present invention;

in the figure: 1. the cable comprises a conductor, 2, an inner shielding layer, 3, an insulating layer, 4, an outer shielding layer, 5, a semiconductive water-blocking tape, 6, a copper strip, 7, an inner double-sided water-blocking tape, 8, a water-blocking filling rope, 9, an outer double-sided water-blocking tape, 10, a nylon sheath, 11, a double-sided aluminum-plastic composite tape, 12, an inner low-smoke halogen-free flame-retardant polyolefin sheath, 13, a ceramic fireproof and fire-retardant composite tape, 14, a high-temperature fireproof mud layer, 15, a glass fiber tape and 16, an outer low-smoke halogen-free flame-retardant polyolefin sheath.

Detailed Description

The technical solution of the present invention will be further specifically described below by way of specific examples.

Example 1:

a medium-voltage three-core environment-friendly waterproof high-flame-retardant power cable (see attached figure 1) comprises a cable core, wherein the cable core is wrapped in an outer double-sided water-blocking tape 9, a nylon sheath 10 is wrapped outside the outer double-sided water-blocking tape, a double-sided aluminum-plastic composite tape 11 is wrapped outside the nylon sheath, an inner low-smoke halogen-free flame-retardant polyolefin sheath 12 is wrapped outside the double-sided aluminum-plastic composite tape, a ceramic fireproof and fire-retardant composite tape 13 is wrapped outside the inner low-smoke halogen-free flame-retardant polyolefin sheath, a high-temperature fireproof mud layer 14 is wrapped outside the ceramic fireproof and fire-retardant composite tape, a glass fiber tape 15 is wrapped outside the high-temperature fireproof mud layer, an outer low-smoke halogen-free flame-retardant polyolefin sheath 16 is wrapped outside the glass fiber tape, the cable core comprises three conductors 1, inner shielding layers 2 are wrapped outside the conductors, insulating layers 3 are wrapped outside the inner shielding layers, the outer side of the outer shielding layer is wrapped with a semi-conductive water-blocking 5 belt, the outer side of the semi-conductive water-blocking belt is wrapped with a copper belt 6, and the outer side of the copper belt is wrapped with an inner double-sided water-blocking belt 7. The insulating layer is a water tree resistant insulating layer. The double-sided aluminum-plastic composite belt is longitudinally wrapped on the outer side of the nylon sheath. And a water-blocking filling rope 8 is filled in a gap between the inner double-sided water-blocking tape and the outer double-sided water-blocking tape. The radius of the conductor is larger than or equal to the sum of the thicknesses of the inner shielding layer, the insulating layer, the outer shielding layer, the semi-conductive water blocking tape, the copper strip and the inner double-sided water blocking tape.

This embodiment is applicable to 35kV and following environment, and the crowded one deck fire layer that separates of fire prevention mud of present fire-retardant structure external use, and fire prevention mud itself belongs to the inorganic matter and can not arouse the conflagration, can not burn or combustion-supporting, can not produce toxic gas even have the burning at flame outward, and the cable still can normally work, has prolonged the life of cable.

The above-described embodiment is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the scope of the invention as set forth in the claims.

Claims

1. The utility model provides a waterproof high fire-retardant power cable of medium-voltage three-core environment-friendly which characterized in that: the cable comprises a cable core, wherein the cable core is wrapped in an outer double-sided water blocking tape, a nylon sheath is wrapped outside the outer double-sided water blocking tape, a double-sided aluminum-plastic composite tape is wrapped outside the double-sided aluminum-plastic composite tape, an inner low-smoke halogen-free flame-retardant polyolefin sheath is wrapped outside the inner low-smoke halogen-free flame-retardant polyolefin sheath, a ceramic fireproof and fire-resistant composite tape is wrapped outside the ceramic fireproof and fire-resistant composite tape, a high-temperature fireproof mud layer is wrapped outside the ceramic fireproof and fire-resistant composite tape, a glass fiber tape is wrapped outside the high-temperature fireproof mud layer, an outer low-smoke halogen-free flame-retardant polyolefin sheath is wrapped outside the glass fiber tape, the cable core comprises three conductors, inner shielding layers are wrapped outside the conductors, insulating layers are wrapped outside the inner shielding layers, an outer shielding layer is wrapped outside the insulating layers, a semi-conductive water blocking tape, and the outer side of the copper strip is wrapped with an inner double-sided water-blocking tape.

2. The medium-voltage three-core environment-friendly waterproof high-flame-retardant power cable according to claim 1, characterized in that: the insulating layer is a water tree resistant insulating layer.

3. The medium-voltage three-core environment-friendly waterproof high-flame-retardant power cable according to claim 1, characterized in that: the double-sided aluminum-plastic composite belt is longitudinally wrapped on the outer side of the nylon sheath.

4. The medium-voltage three-core environment-friendly waterproof high-flame-retardant power cable according to claim 1, characterized in that: and a water-blocking filling rope is filled in a gap between the inner double-sided water-blocking tape and the outer double-sided water-blocking tape.

5. The medium-voltage three-core environment-friendly waterproof high-flame-retardant power cable according to claim 1, characterized in that: the radius of the conductor is larger than or equal to the sum of the thicknesses of the inner shielding layer, the insulating layer, the outer shielding layer, the semi-conductive water blocking tape, the copper strip and the inner double-sided water blocking tape.