CN201435253Y - Special-purpose direct current ethylene propylene rubber insulated power cable for subways - Google Patents

Abstract

A special-purpose direct current ethylene propylene rubber insulated power cable for subways belongs to the technical field of cables and comprises a conductor, wherein the conductor is coated with anisolation belt, an ethylene propylene rubber insulating layer is arranged between the isolation belt and an inner liner, and a flame-retardant belting layer is arranged between the outer of the innerliner and an outer sheath. The special-purpose direct current ethylene propylene rubber insulated power cable for subways has the advantages that the electric performance of the power cable completely meets the requirements of national standard; the transportation efficiency is high; the line loss is small; the current can be conveniently adjusted; the power transmission direction can be conveniently changed; the installation and maintenance costs of the direct current cable are low; and the power cable can perform various functions such as termite resistance, mouse resistance, water resistance, ultraviolet resistance and the like, and is suitable for being used in places such as subways and the like that highly demand on the safety and reliability of devices.

Description

Subway special DC second third insulated power cable

Technical field

The utility model relates to a kind of cable, particularly a kind of 1000V second third insulated power cable that is applicable to subway.

Background technology

At present, the cable and wire that uses on the market at home, its insulation, sheath material mainly are polyvinyl chloride and polythene material, easy breaking out of fire during electric wire short circuit that the traditional polyvinyl chloride of this employing, polyethylene process are produced, smoke density is big during burning, and can produce a large amount of harmful halogen gass, the physical and mental health and the property safety that directly endanger the user.Important events such as rolling stock, boats and ships, subway, large-scale public place of entertainment are also more and more higher to the environmental requirement of cable.Subway engineering also spells out the 1000V direct current cables and adopts protection against rodents, termite-proof, waterproof, antiultraviolet cable, to reduce because the loss that cable fault was caused, for the normal operation of subway provides reliable assurance.The 1000V power cable that subway engineering uses is as adopting protection against rodents, termite-proof, waterproof, antiultraviolet cable, and very possible because cable fault causes damage, and brings potential safety hazard to the operation of subway.

Summary of the invention

The purpose of this utility model is that a kind of subway special DC second third insulated power cable with good protection against rodents, termite-proof, waterproof, ultraviolet resistance will be provided, can reduce because loss that cable fault caused, for the normal operation of subway provides reliable assurance.

The purpose of this utility model is achieved in that a kind of subway special DC second third insulated power cable, comprise conductor, conductor coats the isolation strip outward, is provided with ethylene propylene rubber insulated layer between isolation strip and the inner covering, is provided with fire-retardant belting layer outside the inner covering and between the oversheath.

Subway special DC second third insulated power cable provided by the utility model, the electrical property of cable satisfies request of national standard fully, the transfer efficiency height, line loss is little; It is convenient to regulate electric current and change the power direction of transfer; Installation, the maintenance cost of direct current cables are low; Light transmittance is not less than 70% during cable fire; PH value 〉=4.3 during the sheath burning; Conductivity≤10 μ S/mm; Cable has the category-A or the category-B flame retardant level of GB/T19666 regulation; Cable has and prevents that mouse stings bad function; Cable has the radially function of waterproof; Cable has ultraviolet radiation preventing function, and behind the anti-day light aging test 1008h, the rate of change of tensile strength, elongation at break that records oversheath is between-25%～+ 25%.

Description of drawings

Below in conjunction with drawings and Examples the utility model is done a step explanation.

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

Embodiment

The utility model adopts following structure: a kind of subway special DC second third insulated power cable, comprise conductor 1, the conductor 1 outer isolation strip 2 that coats, isolation strip 2 is provided with ethylene propylene rubber insulated layer 3 with inner covering 4, is provided with fire-retardant belting layer 5 outside the inner covering 4 and between the oversheath 6.

The main technique index of this product is as follows:

1, conductor

Conductor 1 is carried out GB/T 3956-1997 standard, adopts circular stranded compact conductor, and copper wire is drawn by crosslinked workshop continuous annealing big drawing machine, and the strand of conductor is carried out on JLK/630 frame winch.

2, insulating barrier

The insulating barrier 3 of this product adopts ethylene-propylene rubber to do insulation and makes, and insulation thickness meets the regulation of the corresponding clause of GB/T 12706-2002, extrudes on the one-step method extruder.

3, inner covering

Inner covering 4 adopts the low-smoke non-halogen flame-retardant inserts of high oxygen index, extrudes on Φ 150 extruders.Adopt the inner covering of low-smoke non-halogen flame-retardant inserts as cable, this material is a kind of protective cover material of high oxygen index, the inner covering that makes with this material can play the liner effect, combustible ethylene-propylene rubber can be isolated from the outside again, its halogen when burning is overflowed, can discharge water vapour again, have good flame-retardant effect.

4, band

Belting layer 5 meets the regulation of GB2952, adopts two-layer low-smoke non-halogen flame-retardant band overlapping wrapped, carries out on cabler.

5, oversheath

Oversheath 5 adopts low-smoke and halogen-free flame retardant polyolefin jacket material, and thickness meets the regulation of GB/T 12706-2002, carries out on Φ 150 extruders.What cable jacket adopted is low smoke halogen-free flame-retardant polyolefin termite-resistant rodent-resistant antiultraviolet protective cover material, and this sheath halogen when burning is overflowed, and exhaust gas volumn is very little, can charing become shell again, and difficult drop-off has stoped flame to invade cable inside well; The inorganic combustion inhibitor decomposes of protective cover material the inside discharges water vapour simultaneously, and absorbs heat, stops propagation of flame, plays fire-retardant effect.Make sheath have the effect of certain termite-resistant rodent-resistant antiultraviolet owing to dosed corresponding additive in the protective cover material.

Claims (1)

1, a kind of subway special DC second third insulated power cable, comprise conductor (1), it is characterized in that: the outer isolation strip (2) that coats of conductor (1), be provided with ethylene propylene rubber insulated layer (3) between isolation strip (2) and the inner covering (4), be provided with fire-retardant belting layer (5) outside the inner covering (4) and between the oversheath (6).

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