CN214476576U - Crosslinked polyethylene insulation halogen-free low-smoke flame-retardant high-voltage power cable - Google Patents

Abstract

The utility model discloses a low fire-retardant high voltage power cable of fire-retardant of cross-linked polyethylene insulation halogen-free, including conductor, parcel at the inner shield layer in the conductor outside, parcel insulating layer in the inner shield layer outside and the insulating shield layer of parcel at the insulating layer outer layer, the insulating shield layer outside by semiconductor buffering water-blocking tape parcel, the semiconductor buffering water-blocking tape outside be provided with the metal sheath, the metal sheath outside by the low smoke sheath parcel of halogen-free. Through carrying out structural design to this kind of high voltage power cable, can solve the problem that produces a large amount of smog or toxic gas when high tension cable burns.

Description

Crosslinked polyethylene insulation halogen-free low-smoke flame-retardant high-voltage power cable

Technical Field

The utility model relates to a cable equipment field specifically is a low fire-retardant high voltage power cable of fire-retardant of steamed low cigarette of crosslinked polyethylene insulation.

Background

Due to the ever-increasing economics, the demand for large-scale power delivery and supply is increasing. In recent years, under the economic development concept of energy conservation and environmental protection, high-voltage and ultrahigh-voltage power transmission modes mainly characterized by high energy efficiency and low loss have been increasingly applied to long-distance and large-span power transmission lines.

The existing high-voltage cable can meet the flame-retardant requirement, and meanwhile, a large amount of smoke or toxic gas is often generated during combustion, so that the cable cannot be applied to places with intensive people and poor ventilation, and certain potential safety hazards can be generated. In view of the above disadvantages, the invention provides a cross-linked polyethylene insulated halogen-free low-smoke flame-retardant high-voltage power cable, which solves the problem that a large amount of smoke or toxic gas is often generated during the combustion of the high-voltage power cable, and meets the market demand.

SUMMERY OF THE UTILITY MODEL

The utility model provides a low fire-retardant high voltage power cable of fire-retardant of cigarette of insulating nothing of crosslinked polyethylene, this kind of cable fire behaviour is good, does not have a large amount of dense smoke release during the burning, can not produce corrosive gas, can not produce serious environmental pollution.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a cross-linked polyethylene insulating halogen-free low smoke flame retardant high voltage power cable, includes the conductor, wraps up at the internal shield layer in the conductor outside, wraps up at the insulating layer in the internal shield layer outside and wraps up at the insulating layer outer insulation shielding layer, the insulation shielding layer outside by semiconductor buffering water-blocking tape parcel, semiconductor buffering water-blocking tape outside be provided with the metal sheath, the metal sheath outside by the parcel of halogen-free low smoke sheath, through carrying out structural design to this kind of high voltage power cable, can solve the problem that produces a large amount of smog or toxic gas when high voltage cable burns.

Preferably, the conductor is made of oxygen-free copper, which provides good electrical and thermal conductivity as well as excellent plasticity and ductility to the cable.

Preferably, the inner shield layer and the insulating shield layer are made of semi-conductive materials, so that partial discharge between the conductor and the insulating layer and partial discharge between the insulating layer and the sheath are avoided.

Preferably, the metal sheath is a corrugated aluminum sheath, and can bear the short-circuit current of the cable, resist lateral pressure and have the radial waterproof function.

Preferably, an asphalt anti-corrosion layer is arranged between the metal protective layer and the halogen-free low-smoke protective layer, so that the thickness of the asphalt layer is effectively reduced on the premise of ensuring the uniform coating of the anti-corrosion asphalt layer.

Preferably, the graphite conducting layer is arranged on the outer side of the halogen-free low-smoke protective layer, and the conducting layer is a graphite coating with good heat conducting property, high ignition point, acid resistance and high temperature resistance, so that the voltage withstand test of the halogen-free low-smoke protective sleeve is detected.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model effectively reduces the thickness of the asphalt layer;

2. the utility model has good flame-retardant effect;

3. can solve the problem that the high-voltage cable generates a large amount of smoke or toxic gas during combustion.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The above objects, features and advantages of the present invention will become more apparent and the present invention will be explained in detail with reference to the following detailed description.

As shown in fig. 1, the utility model provides a low fire-retardant high tension power cable of fire-retardant of cross-linked polyethylene insulation halogen-free, including conductor 1, parcel at the internal shield layer 2 in the conductor 1 outside, internal shield layer 2 is for even 1 surface electric fields of conductor, avoids causing conductor 1 and insulating layer 3 to take place partial discharge because of the air gap that conductor 1 surface is not smooth and produce.

The insulating layer 3 of parcel in the 2 outsides in internal shield layer protects internal conductor 1 not receive mechanical damage and chemical corrosion, does not contact vapor and wets, prevents that the contact conductor from electrocuting, increases the mechanical strength and the life of cable.

The insulating shielding layer 4 wrapped on the outer layer of the insulating layer 3 avoids partial discharge caused by defects such as cracks on the surface of the insulating layer 3.

The outer side of the insulating shielding layer 4 is wrapped by the semiconductor buffering water-blocking tape 5, the semiconductor buffering water-blocking tape 5 is a water-blocking system formed by compounding polyester fiber non-manufacturing cloth and a high-water-absorption material, has strong water-blocking performance and heat resistance, weakens the electric field strength, prevents the insulating layer 3 from being damaged, has high mechanical strength, is easy for winding and longitudinally wrapping various cables, can effectively play a role in buffering, reduces the damage of the cables in the operation process, and prolongs the service life of the cables.

The outer side of the semiconductor buffering water-blocking tape 5 is provided with a metal protective layer 6, and the semiconductor buffering water-blocking tape has the performances of water resistance, interference resistance and strong mechanical impact resistance.

The outer side of the metal protective layer 6 is wrapped by the halogen-free low-smoke protective layer 7, and after the heat of the crystal water of the hydrated metal oxide in the flame retardant is released, a large amount of heat is absorbed, so that the temperature of the polymer material is increased, and the purpose of flame retardance is achieved; meanwhile, the dehydration decomposition reaction of the water vapor can dilute and combust to generate a large amount of combustible gas so as to achieve the purpose of flame retardance, and the halogen-free low-smoke cable has the characteristics of small smoke density, high light transmittance, no discharge of halogen acid gas and no harmful byproducts during combustion.

The conductor 1 is made of oxygen-free copper for good electrical and thermal conductivity and excellent plasticity and ductility of the cable.

In order to avoid partial discharges between the conductor 1 and the insulating layer 3 and between the insulating layer 3 and the metal sheath 6, the inner shield layer 2 and the insulating shield layer 4 are made of semiconducting materials.

In order to bear the short-circuit current of the cable, resist the lateral pressure and have radial water-proofing, the metal sheath 6 is a corrugated aluminum sheath.

In order to effectively reduce the thickness of the asphalt layer and adapt to complex environments such as humidity, serious chemical solvent corrosion and the like, an asphalt anti-corrosion layer is arranged between the metal protective layer 6 and the halogen-free low-smoke protective layer 7.

In order to carry out a withstand voltage test on the sheath, a graphite conducting layer is arranged on the outer side of the halogen-free low-smoke sheath layer 7.

The cable has no release of a large amount of dense smoke in the combustion process, no corrosive gas escapes, no serious environmental pollution is caused, and the cable can be widely applied to high-risk areas with concentrated personnel and poor air density and low ventilation such as nuclear power stations, subway stations, important military facilities, oil platforms and the like.

Example (b):

firstly, a conductor 1 is stranded by a plurality of oxygen-free copper wires, the outer side of the conductor 1 is wrapped by an inner shielding layer 2, the outer side of the inner shielding layer 2 is wrapped by an insulating layer 3, the outer layer of the insulating layer 3 is wrapped by an insulating shielding layer 4, the outer side of the insulating shielding layer 4 is wrapped by a semiconductor buffering water-blocking tape 5, a metal protective layer 6 is arranged on the outer side of the semiconductor buffering water-blocking tape 5, and the outer side of the metal protective layer 6 is wrapped by a halogen-free low-smoke protective layer 7.

The semiconductor buffering water-blocking tape 5 is a buffering type semiconductor water-blocking tape, a non-woven fabric or silk cotton fabric base fabric is subjected to dip-coating curing to soak glue solution into the base fabric and remove redundant glue solution, and then the base fabric is dried and cut. The glue solution is prepared by proportioning polyvinyl alcohol, carbon black and water according to the weight. Therefore, the buffer type semi-conductive water-blocking tape has the characteristics of a semiconductor, can effectively buffer and weaken the strength of an electric field, effectively buffers the insulating layer 3 and the metal protective layer 6 of the cable, prevents the insulating layer 3 from being damaged, reduces the damage of the cable in the running process, and prolongs the service life of the cable;

the metal protective layer 6 is a corrugated aluminum sheath, and a layer of asphalt coating is coated on the corrugated aluminum sheath, so that the metal protective layer can be more suitable for complex environments such as moist environment, severe corrosion of oils and chemical solvents and the like;

the halogen-free low-smoke protective layer 7 is a halogen-free low-smoke sheath, and the main materials of the sheath are crosslinked polyethylene insulation, flame-retardant crosslinked polyethylene, flame-retardant ethylene propylene rubber and the like. The flame retardant uses hydrated metal oxide, and the flame retardant principle is as follows: after the heat of the crystal water of the hydrated metal oxide in the flame retardant material is released, a large amount of heat is absorbed, the temperature of the polymeric material is prevented from rising, and meanwhile, the dehydration and decomposition reaction of water vapor can dilute and burn to generate a large amount of combustible gas so as to achieve the purpose of flame retardance.

The outer side of the halogen-free low-smoke protective layer 7 is coated with a layer of graphite for carrying out a pressure test on the sheath.

The cable is used for occasions with rated voltage of 110 KV.

After the cable is manufactured, GB/T11017-: the requirements of the standards of the vertical flame spread test B class of the vertically-installed bundled wires and cables:

1. class B by bundled combustion;

2. the fluorine content test is less than or equal to 0.1 percent;

3. the acid gas content test is less than or equal to 0.5 percent;

4, the PH value is more than or equal to 4.3;

5. the conductivity is less than or equal to 10 mu S/mm;

6. the minimum light transmittance is more than or equal to 20 percent.

Although the invention has been described above with reference to embodiments, the combination is not exhaustively described in this specification. The protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of or change the protection scope of the present invention within the technical scope of the present invention. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (6)

1. The utility model provides a cross-linked polyethylene insulation does not have steamed low fire-retardant high voltage power cable of cigarette, includes conductor (1), parcel at internal shield layer (2) in the conductor (1) outside, parcel insulating layer (3) in the internal shield layer (2) outside and parcel at insulating layer (3) outer insulating shield layer (4), its characterized in that, insulating shield layer (4) outside by semiconductor buffering water-blocking tape (5) parcel, semiconductor buffering water-blocking tape (5) outside be provided with metal sheath (6), metal sheath (6) outside by there being steamed low cigarette sheath (7) parcel.

2. The cross-linked polyethylene insulated halogen-free low-smoke flame-retardant high-voltage power cable according to claim 1, characterized in that the conductor (1) is made of oxygen-free copper.

3. The cross-linked polyethylene insulated halogen-free low-smoke flame-retardant high-voltage power cable according to claim 1, wherein the inner shielding layer (2) and the insulating shielding layer (4) are made of a semi-conductive material.

4. The cross-linked polyethylene insulated halogen-free low-smoke flame-retardant high-voltage power cable according to claim 1, wherein the metal sheath (6) is a corrugated aluminum sheath.

5. The cross-linked polyethylene insulated halogen-free low-smoke flame-retardant high-voltage power cable according to claim 1, characterized in that an asphalt anti-corrosion layer is arranged between the metal sheath (6) and the halogen-free low-smoke sheath (7).

6. The cross-linked polyethylene insulated halogen-free low-smoke flame-retardant high-voltage power cable according to claim 1, characterized in that a graphite conducting layer is arranged outside the halogen-free low-smoke sheath (7).

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