CN105679453A

CN105679453A - Anti-corrosion water-resistant crosslinked polyethylene insulated power cable

Info

Publication number: CN105679453A
Application number: CN201610255420.3A
Authority: CN
Inventors: 张卫忠; 史波
Original assignee: Wuxi Shuguang Cable Co Ltd
Current assignee: Wuxi Shuguang Cable Co Ltd
Priority date: 2016-04-25
Filing date: 2016-04-25
Publication date: 2016-06-15

Abstract

The invention discloses an anti-corrosion water-resistant crosslinked polyethylene insulated power cable comprising a cable core which is formed by one or multiple water-resistant wire cores through twisting. A water-resistant filling layer is arranged in the gap of the cable core. The cable core is externally wrapped by a water-resistant tape of which the thickness is 2-4mm. The water-resistant tape is externally and longitudinally wrapped by an aluminum plastic composite tape of which the thickness is 4-6mm and a waterproof PE sheath of which the thickness is 8-10mm in turn. Each water-resistant wire core is composed of a water-resistant conductor, a semiconductor shielding layer, an insulating layer and an insulated shielding layer which extrude on the water-resistant conductor in turn by adopting a three-layer co-extrusion manner, and a nanometer aluminum alloy shielding tape which wraps outside the insulated shielding layer. The cable structure achieves the waterproof objective by adopting the combined effect of the waterproof aluminum plastic composite tape and the extruded polyethylene sheath in the aspect of radial water resistance. The mechanism is that the polyethylene film on the surface of the aluminum plastic composite tape and the internal surface of the polyethylene sheath can be greatly adhered due to the effect of high temperature and pressure of molten polyethylene when the polyethylene sheath is extruded so that entering of external water can be prevented and a great water-resistant effect can be achieved.

Description

A kind of protection against corrosion blocks water power cable with cross-linked polyethylene insulation

Technical field

The present invention relates to fireproof electric wire and cable field, block water power cable with cross-linked polyethylene insulation in particular to a kind of protection against corrosion.

Background technology

The application of domestic crosslinked polyethylene (XLPE) insulated power cable is more and more extensive, so far the history of existing more than 30 year, because of the electric and mechanical and physical performance that it is good, and have that production technique is simple, structure is light, transmission capacity is big, mounting and installation and safeguard easy maintenance, not by advantages such as drop restrictions, be widely used in power system.

The nineties in last century, the cross-linked polyethylene insulated cable that the beginning of the eighties uses once had been investigated by cable experts, it has been found that owing to not adopting the cable of anticorrosion stop water cannot run, cable does not reach the expected design target of 30 years work-ing life. Through the dissection and analysis to failure cable, to be XLPE cable laying and between the operating period major cause, when external force causes cable sheath and insulation harm or joint to damage, moisture or moisture longitudinally can infiltrate with radius clearance along cable, cause XLPE insulation to create water tree under running voltage. Water tree grows into certain length hardships and dangers after certain time can cause permanent electric branch defect at water tree tip, finally causes cable insulation to puncture.

According to statistics, in domestic electrical network 10-35KV power system, direct buried XLPE insulated cable there is no employing stop water, generally just there will be water tree after running 8-12, and breakdown accident occurs, and seriously affects the safe operation of electrical network. Therefore, the use reliability and life-span for ensureing XLPE cable of the anticorrosion stop water of cable all have very important significance.

Complete respectively owing to cable is through working procedures, can have at metallic shield belt surface in the process and multiple may produce moisture: 1) in cable production process material itself containing moisture; 2) cable pyrocondensation cap poor sealing after production completes is good; 3) cable oversheath in laying damaged or when there is superpotential oversheath puncture; 4) when making cable intermediate joint or terminal, not carrying out heating school direct dehumidification with heating blanket, and cable accessory poor sealing when wrapped sealing is good during making, cable splice part has damp vapour to enter;5) according to electric osmosis, owing to China's major part rainwater is in acid, cable long period of soaking is in water, and insulating material contains moisture, and moisture is positively charged under electric field action, and when cable core adds straight polarity trial voltage, moisture is repelled by cable core, oozes to metallic shield; Moisture in insulation is relatively less; When cable core adds negative polarity trial 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 in the process of movement. In normally running with cable in test is completed in cable handing-over, moisture is migration back and forth in the cable, causes 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 sheath lanes and alleys is malleation, impacts sealing place of annex, again for negative pressure can some moisture of inspiration in cable sheath 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 ionogen, owing to present position, mask tape, by electromagnetic field effects, electrochemical reaction can occur, wrapped common metal mask tape on insulation shielding surface just is easy to accelerate corrode.

Summary of the invention

It is an object of the invention 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, non-corrosibility is good.

The present invention discloses a kind of protection against corrosion and blocks water power cable with cross-linked polyethylene insulation, comprise cable core that is stranded by one or more core that blocks water and that become, it is provided with the packing layer that blocks water in the gap of cable core, at the band that blocks water that the outer wrapped thickness of cable core is 2-4mm, it is the aluminium-plastic tape of 4-6mm at the outer vertical bag thickness successively of the band that blocks water and extrudes the waterproof PE sheath that thickness is 8-10mm; The described core that blocks water is made up of water-blocking conductor, the semi-conductive screen layer adopting three-layer co-extruded mode to be extruded on water-blocking conductor successively, insulation layer, insulation screen and wrapped nano aluminum alloy mask tape outside insulation screen.

Improve further, described in the packing layer that blocks water be block water to fill rope, block water to fill yarn or block water to fill rope and block water and fill the community of yarn.

Improving further, described nano aluminum alloy mask tape comprises aluminium alloy basis material layer, and the both sides of this aluminium alloy basis material layer are arranged with the amorphous substance transition layer, non-metallic layer and the nanometer conductive material layer that cover from inside to outside respectively.

After adopting technique scheme, the present invention has following useful effect:

1, the above-mentioned construction of cable selects Water-proof aluminium plastic composite strip and the pe sheath acting in conjunction that extrudes to reach the object of radial waterproof in radial waterproof, its mechanism is for when extruding pe sheath, due to the effect of polyethylene melt body height moderate pressure, the polyethylene film of plastic-aluminum combined belt surface and the internal surface of pe sheath are able to good bonding, thus entering of moisture is prevented from the external world, reach good block-water effect;

2, the metal mask tape nano aluminum alloy mask tape being easily corroded after making moist is replaced, avoid the risk of the oxidized corrosion of common metal mask tape;

3, inwardly take waterproof measure successively from outer jacket, ensure that moisture and moisture can not enter, stop the risk of metal mask tape by etch.

Accompanying drawing explanation

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the structural representation of nano aluminum alloy mask tape of the present invention.

Embodiment

Below in conjunction with accompanying drawing and specific examples the present invention done and further explains:

As shown in Figure 1, a kind of protection against corrosion of the present invention blocks water power cable with cross-linked polyethylene insulation, comprise cable core that is stranded by one or more core that blocks water and that become, it is provided with the packing layer 6 that blocks water in the gap of cable core, at the band 7 that blocks water that the outer wrapped thickness of cable core is 2-4mm, it is the aluminium-plastic tape 8 of 4-6mm at the outer vertical bag thickness successively of the band 7 that blocks water and extrudes the waterproof PE sheath 9 that thickness is 8-10mm; The described core that blocks water is made up of water-blocking conductor 1, the semi-conductive screen layer 2 adopting three-layer co-extruded mode to be extruded on water-blocking conductor 1 successively, insulation layer 3, insulation screen 4 and wrapped nano aluminum alloy mask tape 5 outside insulation screen.

Wherein, the packing layer 6 that blocks water described in is filled rope for blocking water, is blocked water to fill yarn or block water to fill rope and block water and fill the community of yarn so that cable core block-water effect is fine.

As shown in Figure 2, described nano aluminum alloy mask tape 5 comprises aluminium alloy basis material layer 51, and the both sides of this aluminium alloy basis material layer 51 are arranged with the amorphous substance transition layer 52, non-metallic layer 53 and the nanometer conductive material layer 54 that cover from inside to outside respectively.

The design selects metal mask tape to be the nano aluminum alloy mask tape that protection against corrosion is better than copper strips greatly, other subsidiary material of cable are also selected anti-moisture and are stoped moisture material simultaneously, dual ensure that cable can not enter moisture and metal mask tape does not corrode, it is ensured that the life-span of crosslinked polyethylene cable reaches design requirement in 30 years.

The present invention provides a kind of protection against corrosion and blocks water the thinking of power cable with cross-linked polyethylene insulation and method; the method and access of this technical scheme of specific implementation is a lot; the above is only the preferred embodiment of the present invention; should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention. The all available prior art of each integral part not clear and definite in the present embodiment is realized.

Claims

1. a protection against corrosion blocks water power cable with cross-linked polyethylene insulation, it is characterized in that: comprise cable core that is stranded by one or more core that blocks water and that become, the packing layer that blocks water (6) it is provided with in the gap of cable core, at the band (7) that blocks water that the outer wrapped thickness of cable core is 2-4mm, indulge bag thickness outward successively at the band (7) that blocks water and it is the aluminium-plastic tape (8) of 4-6mm and extrudes the waterproof PE sheath (9) that thickness is 8-10mm; The described core that blocks water is made up of water-blocking conductor (1), the semi-conductive screen layer (2) adopting three-layer co-extruded mode to be extruded on water-blocking conductor (1) successively, insulation layer (3), insulation screen (4) and wrapped nano aluminum alloy mask tape (5) outside insulation screen.

2. protection against corrosion according to claim 1 blocks water power cable with cross-linked polyethylene insulation, it is characterised in that: described in the packing layer (6) that blocks water be block water to fill rope, block water to fill yarn or block water to fill rope and block water and fill the community of yarn.

3. protection against corrosion according to claim 1 blocks water power cable with cross-linked polyethylene insulation, it is characterized in that: described nano aluminum alloy mask tape (5) comprises aluminium alloy basis material layer (51), the both sides of this aluminium alloy basis material layer (51) are arranged with the amorphous substance transition layer (52), non-metallic layer (53) and the nanometer conductive material layer (54) that cover from inside to outside respectively.