CN205722924U - A kind of anticorrosion blocks water power cable with cross-linked polyethylene insulation - Google Patents

Abstract

The utility model discloses a kind of anticorrosion to block water power cable with cross-linked polyethylene insulation, including by the stranded cable core of one or more core that blocks water, it is provided with the packed layer that blocks water in the gap of cable core, at the waterstop that the outer wrapped thickness of cable core is 2 4mm, outside waterstop, indulge aluminium-plastic tape that bag thickness is 4 6mm successively and extrude the waterproof PE sheath that thickness is 8 10mm；The described core that blocks water by water-blocking conductor, use three-layer co-extruded mode be extruded in the semiconductive shielding layer on water-blocking conductor, insulating barrier, insulation screen successively and constitute around the nano-aluminium alloy shielding band wrapping in outside insulation screen.This construction of cable selects Water-proof aluminium plastic composite strip and the pe sheath extruded jointly to act on the purpose reaching the most waterproof at radially waterproof aspect, its mechanism is for when extruding pe sheath, effect due to polyethylene melt body height moderate pressure, the polyethylene film of plastic-aluminum combined belt surface is well bondd with the inner surface of pe sheath, thus the entrance of moisture is prevented from the external world, reach good block-water effect.

Description

A kind of anticorrosion blocks water power cable with cross-linked polyethylene insulation

Technical field

This utility model relates to fireproof electric wire and cable field, blocks water power cable with cross-linked polyethylene insulation particularly to a kind of anticorrosion.

Background technology

The application of domestic crosslinked polyethylene (XLPE) insulated power cable is more and more extensive, so far the history of more than 30 year is had, because of the electrically and mechanically physical property that it is good, and have that production technology is simple, portable construction, transmission capacity big, mounting and installation and maintaining is convenient, not by advantages such as drop are limited, be widely used in power system.

The nineties in last century, cable brainstrust once by the beginning of the eighties use cross-linked polyethylene insulated cable investigated, have found that the cable not using anticorrosion stop water cannot run, cable is not reaching to the expected design target of 30 years service life.Through the dissection and analysis to failure cable, main cause is that XLPE cable is laying and run duration, when external force causes cable cover(ing) and insulation harm or joint failure, moisture or moisture can penetrate into along cable longitudinally and radially gap, cause XLPE insulation to create water tree under working voltage.Water tree grows into certain length hardships and dangers after certain time can cause permanent electric branch defect at water tree tip, ultimately results in cable insulation and punctures.

According to statistics, in domestic electrical network 10-35KV power system, direct buried XLPE insulated cable there is no employing stop water, generally arises that water tree after running 8-12, breakdown accident occurs, has a strong impact on the safe operation of electrical network.Therefore, using of cable anticorrosion stop water all has very important significance with the life-span for the reliability ensureing XLPE cable.

Owing to cable is to complete respectively through working procedures, can have the multiple moisture that may produce at metallic shield belt surface in the process: 1) material itself contains moisture in cable production process；2) cable pyrocondensation cap poor sealing after production completes is good；3) when cable oversheath in laying is damaged or overvoltage occurs, oversheath punctures；4), when making cable intermediate joint or terminal, during making, unused heating blanket carries out heating alignment dehumidifying, and cable accessory poor sealing when wrapped sealing is good, and cable connector part has damp vapour to enter；5) according to electroosmosis, owing to China's major part rainwater is acidity, cable long period of soaking is in water, and insulant contains moisture, and moisture is positively charged under electric field action, and when cable core adds positive polarity test voltage, moisture is repelled by cable core, oozes to metallic shield；Moisture in insulation is relatively fewer；When cable core adds negative polarity test voltage, moisture can be attracted by cable core, oozed insulation and moves to cable core, and made the moisture of high field area in insulation relatively increase during movement.Cable handing-over completion test in and cable properly functioning in, moisture migration the most back and forth, cause metallic shield to be corroded；6) when cable fully loaded---semi-load---maintenance or day and night temperature are bigger, the gas in oversheath can affect due to positive/negative-pressure, and when being heated, cable cover(ing) lanes and alleys is malleation, at the sealing of impact adnexa, and again can some moisture of inspiration for negative pressure in cable cover(ing) after cooling.

Distribute owing to will generate heat need to outwards conduct when cable energising runs simultaneously, when in cable or running environment containing moisture and electrolyte, owing to shielding band present position can be occurred electrochemical reaction by electromagnetic field effects, just it is easy to around the conventional metal shields band wrapped on insulation shielding surface accelerate to corrode.

Utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, it is provided that be the power cable with cross-linked polyethylene insulation that a kind of water preventing ability is good, anticorrosive property is good.

The utility model discloses a kind of anticorrosion to block water power cable with cross-linked polyethylene insulation, including by the stranded cable core of one or more core that blocks water, it is provided with the packed layer that blocks water in the gap of cable core, it is the waterstop of 2-4mm at the outer wrapped thickness of cable core, outside waterstop, indulges aluminium-plastic tape that bag thickness is 4-6mm successively and extrude the waterproof PE sheath that thickness is 8-10mm；The described core that blocks water by water-blocking conductor, use three-layer co-extruded mode be extruded in the semiconductive shielding layer on water-blocking conductor, insulating barrier, insulation screen successively and constitute around the nano-aluminium alloy shielding band wrapping in outside insulation screen.

Improve further, described in block water packed layer be block water gasket for packing, block water and fill yarn or the gasket for packing and block water and fill the community of yarn of blocking water.

Improving further, described nano-aluminium alloy shielding band includes aluminium alloy base layer material, and the both sides of this aluminium alloy base layer material are respectively symmetrically and are provided with amorphous substance transition zone, non-metallic layer and the nanometer conductive material layer covered from inside to outside.

After using technique scheme, the method have the advantages that

1, the above-mentioned construction of cable selects Water-proof aluminium plastic composite strip and the pe sheath extruded jointly to act on the purpose reaching the most waterproof at radially waterproof aspect, its mechanism is for when extruding pe sheath, effect due to polyethylene melt body height moderate pressure, the polyethylene film of plastic-aluminum combined belt surface is well bondd with the inner surface of pe sheath, thus the entrance of moisture is prevented from the external world, reach good block-water effect；

2, the metal mask tape nano-aluminium alloy shielding band being easily corroded after making moist replaces, it is to avoid the risk of the common oxidized corrosion of metal mask tape；

3, take waterproof measure the most successively from outer jacket, it is ensured that moisture and moisture are not likely to enter, stop the metal mask tape risk by etch.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model；

Fig. 2 is the structural representation of this utility model nano-aluminium alloy shielding band.

Detailed description of the invention

With instantiation this utility model done below in conjunction with the accompanying drawings and further explains:

As shown in Figure 1, a kind of anticorrosion described in the utility model blocks water power cable with cross-linked polyethylene insulation, including by the stranded cable core of one or more core that blocks water, it is provided with the packed layer 6 that blocks water in the gap of cable core, at the waterstop 7 that the outer wrapped thickness of cable core is 2-4mm, indulge aluminium-plastic tape 8 that bag thickness is 4-6mm successively and extrude the waterproof PE sheath 9 that thickness is 8-10mm waterstop 7 is outer；Semiconductive shielding layer 2 that the described core that blocks water by water-blocking conductor 1, uses three-layer co-extruded mode to be extruded in successively on water-blocking conductor 1, insulating barrier 3, insulation screen 4 and constitute around the nano-aluminium alloy shielding band 5 wrapping in outside insulation screen.

Wherein, the packed layer 6 that blocks water described in be block water gasket for packing, block water fill yarn or block water gasket for packing and block water fill yarn community so that cable core block-water effect is fine.

As in figure 2 it is shown, described nano-aluminium alloy shielding band 5 includes aluminium alloy base layer material 51, the both sides of this aluminium alloy base layer material 51 are respectively symmetrically and are provided with amorphous substance transition zone 52, non-metallic layer 53 and the nanometer conductive material layer 54 covered from inside to outside.

The design selects metal mask tape to be the nano-aluminium alloy shielding band that anticorrosion is much stronger than copper strips, other auxiliary materials of cable are also selected anti-moisture and stop moisture material simultaneously, dual ensure that cable can not enter moisture and metal mask tape does not corrodes, it is ensured that the life-span of twisted polyethylene cable reaches to design requirement in 30 years.

This utility model provides a kind of anticorrosion and blocks water the thinking of power cable with cross-linked polyethylene insulation and method; the method and the approach that implement this technical scheme are a lot; the above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; on the premise of without departing from this utility model principle, it is also possible to make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.Each ingredient the clearest and the most definite in the present embodiment all can use prior art to be realized.

Claims (3)

1. an anticorrosion blocks water power cable with cross-linked polyethylene insulation, it is characterized in that: include the cable core stranded by one or more core that blocks water, the packed layer that blocks water (6) it is provided with in the gap of cable core, at the waterstop (7) that the outer wrapped thickness of cable core is 2-4mm, indulge, at waterstop (7), aluminium-plastic tape (8) that bag thickness is 4-6mm the most successively and extrude the waterproof PE sheath (9) that thickness is 8-10mm；Semiconductive shielding layer (2) that the described core that blocks water by water-blocking conductor (1), uses three-layer co-extruded mode to be extruded in successively on water-blocking conductor (1), insulating barrier (3), insulation screen (4) and constitute around nano-aluminium alloy shielding band (5) wrapping in outside insulation screen.

Anticorrosion the most according to claim 1 blocks water power cable with cross-linked polyethylene insulation, it is characterised in that the packed layer (6) that blocks water described in: be block water gasket for packing, block water and fill yarn or the gasket for packing and block water and fill the community of yarn of blocking water.

Anticorrosion the most according to claim 1 blocks water power cable with cross-linked polyethylene insulation, it is characterised in that: described nano-aluminium alloy shielding band (5) includes aluminium alloy base layer material (51), this aluminium alloy base layer material (51) both sides are respectively symmetrically and are provided with amorphous substance transition zone (52), non-metallic layer (53) and the nanometer conductive material layer (54) covered from inside to outside.