CN205595121U

CN205595121U - Waterproofing type middling pressure frequency conversion cable

Info

Publication number: CN205595121U
Application number: CN201620258865.2U
Authority: CN
Inventors: 朱小亮; 张高洋; 王义林; 林爱华; 王勤仙
Original assignee: JIANGSU CHANGFENG CABLE CO Ltd
Current assignee: JIANGSU CHANGFENG CABLE CO Ltd
Priority date: 2016-03-31
Filing date: 2016-03-31
Publication date: 2016-09-21
Anticipated expiration: 2026-03-31

Abstract

The utility model discloses a waterproofing type middling pressure frequency conversion cable, including the cable core, its cable core is formed by three sinle silk transposition, is equipped with the filling layer that blocks water in the cable core space, and the cable core is equipped with water blocking layer, total shielding layer, isolation layer, metal sheath and outer jacket outward in proper order. The sinle silk by the copper conductor and in proper order internal shield layer, insulating layer and the external shielding layer of crowded package outside the conductor constitute, the external shielding layer sets up semiconduction water blocking layer, phase separating iron shielded layer and phase separating sheath outward again. The utility model discloses very good radial and vertical dual block -water performance have, can prevent that steam from getting into the cable inside, prolonged the life of cable, cable structure symmetrical balance can eliminate pulse voltage and to cable insulation's influence, prevent that the insulating layer from being punctured, the phase separating metallic shield of cable both can regard as the shielding layer of cable, can regard as the neutral conductor to use again, had saved material cost.

Description

A kind of waterproofing type medium voltage converter cable

Technical field

This utility model belongs to power cable field, is specifically related to a kind of waterproofing type medium voltage converter cable.

Background technology

Frequency-changing cable is mainly used in the connection between converter and motor and converter and electrical network, can be widely used for papermaking, metallurgy, mine, railway and food service industry etc..Along with industrial expansion, high-tension high-power motor constantly occurs, the problem that the speed governing of Medium-voltage motor has become again necessary solution, medium voltage frequency converter arises at the historic moment, and owing to transmitting the change of electric pressure, brings again new problem: one is blocking water of medium voltage converter cable, water is the primary factor affecting cable security performance, steam once enters inside cable, and the insulation crosslinked polyethylene of midium voltage cable easily produces water tree, and the service life of cable will be substantially reduced；Two is the pulse voltage impact on insulation, and the frequency range of variable-frequency power sources is relatively wide, but its waveform is the frequency band profile of a basic frequency, contains many higher hamonic waves, and amplitude is the biggest, and this harmonic wave can feed through to cable, it is possible to causes cable breakdown.

Utility model content

The purpose of this utility model is to provide a kind of waterproofing type medium voltage converter cable, can prevent steam from entering inside cable, thus improves cable service life；Also can eliminate the pulse voltage impact on cable insulation, prevent insulating barrier breakdown.

The utility model discloses a kind of waterproofing type medium voltage converter cable, including cable core, its cable core is to be formed by three cores are stranded, and the gap of cable core is provided with the packed layer that blocks water, and is sequentially provided with water blocking layer, total screen layer, sealing coat, metal sheath and outer jacket outside cable core；Described core is by copper conductor and is extruded in the conductor shield outside copper conductor, insulating barrier and insulation screen successively and constitutes, and sets gradually semiconductive water blocking layer, split-phase metal screen layer and split-phase sheath outside insulation screen again；Described semiconductive water blocking layer is the semiconductor waterstop that two superimposed is wrapped, wherein one layer is arranged between insulation screen and split-phase metal screen layer, another layer is arranged between split-phase metal screen layer and split-phase sheath, described split-phase metal screen layer by left-hand dredge around copper wire and the wrapped copper strips tightened of dextrad form, copper wire cross section sum not less than copper conductor cross section 1/2nd.

Improving further, described split-phase sheath is made up of pe sheath.

Improve further, described in the packed layer that blocks water be made up of water blocking yarn.

Improving further, described water blocking layer is made up of overlapping wrapped two-sided waterstop.

Improving further, described total screen layer is made up of overlapping wrapped copper strips or alloy strip.

Improving further, described sealing coat is made up of pvc sheath or polyolefin jacket.

Improving further, described metal sheath is made up of the aluminium sheath extruded continuously.

Improving further, described outer jacket is made up of pvc sheath or polyolefin jacket.

The beneficial effects of the utility model are:

Compared with prior art, waterproofing type medium voltage converter cable described in the utility model, have employed the multiple stop waters such as core blocks water, cable core blocks water, can effectively prevent steam from entering inside cable, thus extend the service life of cable；Construction of cable symmetrical balance, can eliminate the pulse voltage impact on cable insulation, prevent insulating barrier breakdown；The split-phase metallic shield of cable can not only be used for the screen layer of cable, can use as the neutral conductor again, saves material cost.

Accompanying drawing explanation

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

Detailed description of the invention

With detailed description of the invention this utility model done below in conjunction with the accompanying drawings and further illustrate.

As shown in Figure 1, a kind of waterproofing type medium voltage converter cable described in the utility model, including cable core, its cable core is to be formed by three cores are stranded, conductor shield 2, insulating barrier 3 and insulation screen 4 that described core by copper conductor 1 and is extruded in outside copper conductor 1 successively are constituted, and insulation screen 4 is outer sets gradually semiconductive water blocking layer 5, split-phase metal screen layer 6 and split-phase sheath 7 again；Cable core space use the packed layer 8 that blocks water be filled with, the water blocking layer 9 being made up of overlapping wrapped two-sided waterstop is extruded outside cable core, the outer wrapped total screen layer 10 being made up of overlapping wrapped alloy strip of water blocking layer 9, extrude, outside total screen layer 10, the sealing coat 11 being made up of pvc sheath or polyolefin jacket, extruding the metal sheath 12 being made up of the aluminium sheath extruded continuously outside sealing coat 11, finally the outermost layer at cable extrudes the outer jacket 13 being made up of pvc sheath or polyolefin jacket.

Described semiconductive water blocking layer 5 is the semiconductor waterstop that two superimposed is wrapped, wherein one layer is arranged between insulation shielding and split-phase metallic shield, another layer is arranged between split-phase metallic shield and split-phase sheath, use semiconductor waterstop neither to affect metal screen layer transmission electric current, can effectively prevent again steam from longitudinally and radially penetrating into insulated wire cores.

Described split-phase metal screen layer 6 by left-hand dredge around copper wire and the wrapped copper strips tightened of dextrad form, copper wire cross section sum not less than copper conductor 1 cross section 1/2nd；Metal screen layer uses as neutral core, it is necessary to carry the biggest electric current, and metallic shield copper wire cross section sum is not less than 1/2nd of copper conductor 1 cross section, it can be ensured that cable is used safely；Consider the structural symmetry of cable, metallic shield copper wire is divided into three parts and dredges that to be wound on core peripheral respectively.

Described water blocking layer 9 is made up of overlapping wrapped two-sided waterstop, two-sided waterstop can radial water-resisting, be connected with the packed layer 8 that blocks water again, form comprehensive waterproof system, it is achieved radial water-resisting.

This utility model provides a kind of thinking and the method for waterproofing type medium voltage converter cable; 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 domain of the present utility model.Each component part the clearest and the most definite in the present embodiment all can use prior art to be realized.

Claims

1. a waterproofing type medium voltage converter cable, including cable core, its cable core is to be formed by three cores are stranded, and the gap of cable core is provided with the packed layer that blocks water (8), is sequentially provided with water blocking layer (9), total screen layer (10), sealing coat (11), metal sheath (12) and outer jacket (13) outside cable core；It is characterized in that: conductor shield (2), insulating barrier (3) and insulation screen (4) that described core by copper conductor (1) and is extruded in outside copper conductor successively are constituted, and insulation screen (4) sets gradually semiconductive water blocking layer (5), split-phase metal screen layer (6) and split-phase sheath (7) the most again；Described semiconductive water blocking layer (5) is the semiconductor waterstop that two superimposed is wrapped, wherein one layer is arranged between insulation screen and split-phase metal screen layer, another layer is arranged between split-phase metal screen layer and split-phase sheath, described split-phase metal screen layer by left-hand dredge around copper wire and the wrapped copper strips tightened of dextrad form, copper wire cross section sum not less than copper conductor cross section 1/2nd.

Waterproofing type medium voltage converter cable the most according to claim 1, it is characterised in that described split-phase sheath (7) is made up of pe sheath.

Waterproofing type medium voltage converter cable the most according to claim 1, it is characterised in that described in the packed layer (8) that blocks water be made up of water blocking yarn.

Waterproofing type medium voltage converter cable the most according to claim 1, it is characterised in that described water blocking layer (9) is made up of overlapping wrapped two-sided waterstop.

Waterproofing type medium voltage converter cable the most according to claim 1, it is characterised in that described total screen layer (10) is made up of overlapping wrapped copper strips or alloy strip.

Waterproofing type medium voltage converter cable the most according to claim 1, it is characterised in that described sealing coat (11) is made up of pvc sheath or polyolefin jacket.

Waterproofing type medium voltage converter cable the most according to claim 1, it is characterised in that described metal sheath (12) is made up of the aluminium sheath extruded continuously.

Waterproofing type medium voltage converter cable the most according to claim 1, it is characterised in that described outer jacket (13) is made up of pvc sheath or polyolefin jacket.