CN216487364U - A polypropylene insulated fire-resistant power cable with a rated voltage of 6~35kV - Google Patents
A polypropylene insulated fire-resistant power cable with a rated voltage of 6~35kV Download PDFInfo
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- CN216487364U CN216487364U CN202123122800.5U CN202123122800U CN216487364U CN 216487364 U CN216487364 U CN 216487364U CN 202123122800 U CN202123122800 U CN 202123122800U CN 216487364 U CN216487364 U CN 216487364U
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Abstract
本实用新型公开了一种额定电压6~35kV的聚丙烯绝缘耐火电力电缆，包含多根绝缘线芯以及设置在绝缘线芯外侧的阻燃外护套结构、铠装层和外护套，所述绝缘线芯包含软铜导体以及由内至外依次设置在软铜导体外侧的半导电导体屏蔽、聚丙烯绝缘、半导电绝缘屏蔽和金属屏蔽层。本实用新型采用低碳环保可回收聚丙烯绝缘材料，提高了电缆的正常运行温度，确保输电线路的用电安全和低碳环保，采用双重耐火+双护层阻燃结构，从电缆内部和外部进行同时阻燃耐火，有效控制电缆燃烧时火焰产生的火焰蔓延、烟密度、毒性指数等指标，在火灾发生时的防火性能，使电缆长期运行时安全可靠。
The utility model discloses a polypropylene insulated fire-resistant power cable with a rated voltage of 6-35kV, which comprises a plurality of insulated wire cores, a flame-retardant outer sheath structure, an armor layer and an outer sheath arranged outside the insulated wire cores. The insulated wire core includes a soft copper conductor and a semiconducting conductor shielding, polypropylene insulation, semiconducting insulating shielding and metal shielding layers sequentially arranged on the outside of the soft copper conductor from the inside to the outside. The utility model adopts low-carbon and environmentally-friendly recyclable polypropylene insulating material, which improves the normal operating temperature of the cable, ensures the safety of electricity consumption and low-carbon environmental protection of the transmission line, and adopts a double fire-resistant + double-sheathing flame-retardant structure. At the same time, it is flame-retardant and fire-resistant, effectively controlling the flame spread, smoke density, toxicity index and other indicators of the flame when the cable is burning, and the fire performance in the event of a fire makes the cable safe and reliable for long-term operation.
Description
Technical Field
The utility model relates to a power cable, especially a rated voltage 6~35 kV's insulating fire-resistant power cable of polypropylene belongs to cable technical field.
Background
The wide application of the fireproof power cable with the rated voltage of 6-35kV is a necessary trend of power cable development in public places such as high-rise buildings, airport terminal buildings, subways and the like in China in the future, is an important component of social development and economic construction, and has a wide development and application space for fire safety prevention. The economy of China is developed at a high speed, and the technical measures are adopted to practically solve the problem of the operation safety of the cable in the case of fire. The fire-resistant power cable with the rated voltage of 6-35kV adopts environment-friendly insulating materials, fire-resistant filling, extrusion fire-resistant layers and low-smoke low-toxicity outer protective layers as technical development directions, is beneficial to promoting high-end development of special cables in China, and practically protects life and property safety of people.
The existing fireproof power cable with the rated voltage of 6-35kV mainly has the following problems:
1) current rated voltage 6~35kV fire-resistant power cable, most fire-resistant band are wrapped and are added fire-retardant oversheath structure, need or not exactly that fire resistance is poor, under the outside high temperature condition, can't last circular telegram, produce a large amount of toxic gas and smog when burning, bring the hidden danger for people's life and property safety when the conflagration.
2) Due to the special environment of the use of the fire-resistant power cable with the rated voltage of 6-35kV, particularly in airport terminal buildings, subways and high-rise buildings, the safety, environmental protection, fire resistance and flame retardant effects of the cable are more important, and at present, various manufacturers continuously explore, research and develop more effective solutions or more superior product structures.
3) The fire-resistant power cable with the rated voltage of 6-35kV has higher and higher requirements on fire resistance and environmental protection, how to solve the problems becomes a key, the environment-friendly material is used and replaced, the design structure of the cable and the excellent fire-resistant flame-retardant material are optimized, and the fire resistance, safety and environmental protection performance of the cable can be improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a polypropylene insulation fire-resistant power cable of rated voltage 6~35kV is provided, improves fire-resistant, safety ring protects the performance.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
the utility model provides a rated voltage 6-35 kV's insulating fire-resistant power cable of polypropylene, contains many insulation core and sets up fire-retardant oversheath structure, armor and the oversheath in the insulation core outside, its characterized in that: the insulating wire core comprises a soft copper conductor, and a semi-conductive conductor shield, a polypropylene insulator, a semi-conductive insulation shield and a metal shield layer which are sequentially arranged on the outer side of the soft copper conductor from inside to outside.
Furthermore, gaps among the multiple insulating wire cores and gaps between the insulating wire cores and the flame-retardant outer sheath structure are filled with ceramic fireproof filling layers.
Further, the flame-retardant outer sheath structure comprises a low-smoke halogen-free flame-retardant oxygen-insulating layer and a ceramic polyolefin flame-retardant layer positioned outside the low-smoke halogen-free flame-retardant oxygen-insulating layer.
Further, the inboard on fire-retardant oxygen layer that separates of low smoke and zero halogen is provided with first fire-resistant silicon rubber area around the covering.
Further, a second fire-resistant silicon rubber tape wrapping layer is arranged between the low-smoke halogen-free flame-retardant oxygen-isolating layer and the ceramic polyolefin fire-resistant layer.
Further, a third fire-resistant silicon rubber tape wrapping layer is arranged on the outer side of the ceramic polyolefin fire-resistant layer.
Further, a fourth fireproof silicon rubber tape wrapping layer is arranged between the armor layer and the outer sheath.
Further, the outer sheath is made of low-smoke halogen-free flame-retardant materials.
Compared with the prior art, the utility model, have following advantage and effect:
1. the utility model adopts the environment-friendly recoverable polypropylene insulating layer, the polypropylene (PP) is used as thermoplastic plastic, the price is low, the mechanical strength is high, the processability is good, the heat resistance and the electric insulation performance are good, the electrical performance is basically not influenced by the change of the electric field frequency of the environmental hygrometer, the arc resistance performance is good, the heat resistance is good, and the polypropylene (PP) can be used for a long time at the temperature of more than 100 ℃; for the non-degradable and non-recyclable cross-linked polyethylene insulation, the polypropylene insulation material meets the requirements of low-carbon and environment-friendly materials.
2. The utility model discloses a pottery fire-resistant packing, fire-resistant silicon rubber area around covering and crowded ceramic polyolefin flame retardant coating of package can play dual fire prevention effect, improve the fire behavior of cable body, separate oxygen layer and two sheaths of low smoke and zero halogen fire-retardant polyolefin outer protection and can effectively improve the fire behavior of cable.
3. The fireproof cable is characterized in that a super-strong fireproof structure is adopted, a ceramic fireproof filling rope, a fireproof silicon rubber tape wrapping layer and a ceramic polyolefin tape are encrusted at high temperature, the fireproof cable can reach the grade of a fireproof cable specified by BS 6387:2013, the fireproof temperature is 950 ℃, power can be normally supplied for 180min, the conductor is a soft copper conductor, is insulated by polypropylene, is filled in a ceramic fireproof manner, is of a fireproof silicon rubber tape wrapping layer, a low-smoke halogen-free flame-retardant oxygen insulation layer, a fireproof silicon rubber tape wrapping layer, a ceramic polyolefin fireproof layer, a fireproof silicon rubber tape wrapping layer and a low-smoke halogen-free flame-retardant outer protection layer, and is convenient to construct due to an excellent bending radius and can be laid in various complex environments.
4. The low-smoke halogen-free flame-retardant isolation layer and the low-smoke halogen-free flame-retardant polyolefin sheath are adopted, so that the indexes of heat release, flame spread, smoke density and the like during combustion are greatly reduced in flame retardant property, and the low-smoke halogen-free flame-retardant fire-resistant cable can easily pass a low-smoke halogen-free flame-retardant bundled combustion test.
Drawings
FIG. 1 is a schematic diagram of the utility model discloses an insulating fire-resistant power cable of polypropylene of rated voltage 6~35 kV.
Detailed Description
To elaborate the technical solution adopted by the present invention to achieve the predetermined technical purpose, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of the present invention, not all embodiments, and technical means or technical features in the embodiments of the present invention can be replaced without inventive labor, and the present invention will be described in detail below with reference to the accompanying drawings in combination with the embodiments.
If fig. 1 is the utility model discloses an insulating fire-resistant power cable of polypropylene of rated voltage 6~35kV contains many insulation core and sets up fire-retardant oversheath structure, armor and the oversheath in the insulation core outside, and in fig. 1, 3 insulation core twists together, and fire-retardant oversheath structure, armor and oversheath set gradually in the outside of twisting sinle silk from inside to outside.
The insulated wire core comprises a soft copper conductor 1, and a semi-conductive conductor shield 2, a polypropylene insulator 3, a semi-conductive insulation shield 4 and a metal shield layer 5 which are sequentially arranged on the outer side of the soft copper conductor 1 from inside to outside. The soft copper conductor 1 mainly functions to transmit electric power. The semi-conductive conductor shield 2 mainly acts as a balancing electric field and is equipotential to the conductor, thereby avoiding partial discharge between the conductor and the insulating layer. The polypropylene insulation 3 mainly plays a role in preventing current from diffusing outwards, enabling the current to be transmitted towards one direction and protecting the conductor from being corroded and damaged. The semi-conductive insulation shield 4 mainly plays a role in equalizing the electric field and the equipotential of the metal sheath, and partial discharge between the insulation layer and the sheath is avoided. The metal shielding layer 5 mainly plays a role in shielding an electric field and transmitting short-circuit current. The insulated wire core is insulated by adopting a polypropylene insulating material instead of the traditional crosslinked polyethylene, so that the overall safety and environmental protection performance of the cable are improved. The long-term stable operation temperature of the polypropylene insulated power cable can reach more than 100 ℃, so that the current carrying capacity of the cable is improved, and the line is safer. The polypropylene insulation is a thermoplastic material, which is degradable and recyclable, so that the cable is more environment-friendly. The plate conductive conductor shield 2 and the semi-conductive insulation shield 4 are both made of polypropylene as a base material and carbon black.
Gaps among the plurality of insulating wire cores and gaps between the insulating wire cores and the flame-retardant outer sheath structure are filled with ceramic fire-resistant filling layers 6. The ceramic fireproof filling layer is mainly a ceramic fireproof filling rope formed by twisting and weaving a ceramic fireproof composite belt and a glass fiber rope, and mainly plays a role in filling a cabling gap to ensure the roundness of a cable and simultaneously preventing flame from damaging insulation during fire.
The flame-retardant outer sheath structure comprises a first fire-resistant silicone rubber belt wrapping layer 7, a low-smoke halogen-free flame-retardant oxygen-isolating layer 8, a second fire-resistant silicone rubber belt wrapping layer 9, a ceramic polyolefin fire-resistant layer 10, a third fire-resistant silicone rubber belt wrapping layer 11 and a fourth fire-resistant silicone rubber belt wrapping layer 13 arranged between an armor layer 12 and an outer sheath 14, which are sequentially arranged from inside to outside. Wherein, first fire-resistant silicon rubber area plays the effect on separation metal shielding layer and separate the oxygen layer around covering 7, and the construction of being convenient for is laid, plays fire-retardant fire-resistant effect simultaneously. The low-smoke halogen-free flame-retardant oxygen-isolating layer 8 takes halogen-free non-toxic modified polyolefin resin as a main raw material, and can isolate oxygen to provide a combustion improver during combustion, so that flame spread is effectively prevented. The fire-resistant silicon rubber area of second plays the effect that the separation separates oxygen layer and flame retardant coating around covering 9, and the construction of being convenient for is laid, plays fire-retardant fire-resistant effect simultaneously. The ceramized polyolefin fire-resistant layer 10 mainly plays a role of fire resistance. The third fire-resistant silicon rubber belt plays the effect of separation ceramic fire-resistant layer and metal armor around covering 11, and the construction of being convenient for is laid, plays fire-retardant fire-resistant effect simultaneously. The fourth fire-resistant silicon rubber area plays the effect of separation metal armor and outer jacket around covering 13, and the construction of being convenient for is laid, plays fire-retardant fire-resistant effect simultaneously. The fire-resistant silicon rubber belt is formed by rolling and compounding ceramic fire-resistant rubber and high-temperature-resistant alkali-free glass fiber cloth.
The utility model discloses a fire-retardant oversheath structure has increased fire-resistant technique on ordinary fire-resistant power cable's basis, the structure is more reasonable, the refractory time is longer, use the fire-resistant packing of pottery ization, the fire-resistant band of glass fiber tape winds the package, the fire-resistant structure of pottery ization polyolefin sheath, can ensure that the bending radius of cable itself can not improve when meeting with the conflagration, thereby make the cable lay in multiple complex environment, the operation, the effective operating duration of cable is longer when the conflagration takes place, the destructive power that receives the conflagration influence is littleer, the cable operation is more stable. With the increasing requirements of flame retardant grade and objective factors during fire, the conventional A, B, C flame retardant grade is not enough to meet the flame retardant requirements, smoke density, toxicity index and other index items of special occasions, and the use requirements of the cable in the special occasions are greatly improved. The ceramic fire-resistant filling and ceramic polyolefin are continuously burnt in high temperature to form a ceramic bonding shell layer, and the highest temperature resistance can reach more than 1000 ℃. Separate the two protective layer structures of oxygen layer and low smoke and zero halogen flame retardant polyolefin, the effectual oxygen that prevents carries out the sustained combustion as the combustion improver to the cable, plays fine flame retardant efficiency to implement outside mechanical properties protection to the cable body.
The armor layer 12 is a metal armor layer, plays the effect of tensile, resistance to compression, and the protection cable core inner structure does not receive the destruction of external force. The outer sheath 14 is made of low-smoke halogen-free flame-retardant material, takes halogen-free non-toxic modified polyolefin resin as a main raw material, and mainly has the functions of environmental protection, flame retardance and cable protection.
To sum up, the utility model discloses can use to have the higher and special relevant place of fire-resistant fire-retardant grade, like high-rise building, airport terminal building, subway station, can improve the safe operation of circuit, can be extensive in batches use at metal processing, mine, railway, metallurgical industry, ensure the safety ring of whole operation circuit, steady operation and improve the power supply quality, increase equipment life. The utility model discloses a recoverable polypropylene insulating material of low carbon environmental protection has improved the normal operating temperature of cable, ensures transmission line's power consumption safety and low carbon environmental protection. The cable has the advantages that the double-fire-resistant and double-protective-layer flame-retardant structure is adopted, flame retardance and fire resistance are simultaneously carried out from the inside and the outside of the cable, indexes such as flame spread, smoke density and toxicity index generated by flame during cable combustion are effectively controlled, and the cable is safe and reliable in long-term operation due to the fireproof performance during fire.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed with the preferred embodiment, it is not limited to the present invention, and any skilled person in the art can make modifications or changes equivalent to the equivalent embodiment without departing from the technical scope of the present invention, but all the modifications, equivalent substitutions, and improvements made to the above embodiments within the spirit and principle of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (8)
1. The utility model provides a fire-resistant power cable of polypropylene insulation of rated voltage 6~35kV, contains many insulation core and sets up fire-retardant oversheath structure, armor and the oversheath in the insulation core outside, its characterized in that: the insulating wire core comprises a soft copper conductor, and a semi-conductive conductor shield, a polypropylene insulator, a semi-conductive insulation shield and a metal shield layer which are sequentially arranged on the outer side of the soft copper conductor from inside to outside.
2. The polypropylene insulated fireproof power cable with the rated voltage of 6-35kV according to claim 1, wherein: gaps among the insulating wire cores and gaps between the insulating wire cores and the flame-retardant outer sheath structure are filled with ceramic fire-resistant filling layers.
3. The polypropylene insulated fireproof power cable with the rated voltage of 6-35kV according to claim 2, wherein: the flame-retardant outer sheath structure comprises a low-smoke halogen-free flame-retardant oxygen-isolating layer and a ceramic polyolefin flame-retardant layer positioned outside the low-smoke halogen-free flame-retardant oxygen-isolating layer.
4. The polypropylene insulated fireproof power cable with the rated voltage of 6-35kV according to claim 3, wherein: the inboard on fire-retardant oxygen layer that separates of low smoke and zero halogen is provided with first fire-resistant silicon rubber area around the covering.
5. The polypropylene insulated fire-resistant power cable with the rated voltage of 6-35kV according to claim 4, characterized in that: and a second fire-resistant silicon rubber tape wrapping layer is arranged between the low-smoke halogen-free flame-retardant oxygen-insulating layer and the ceramic polyolefin fire-resistant layer.
6. The polypropylene insulated fireproof power cable with the rated voltage of 6-35kV according to claim 5, wherein: and a third fire-resistant silicon rubber tape wrapping layer is arranged on the outer side of the ceramic polyolefin fire-resistant layer.
7. The polypropylene insulated fireproof power cable with the rated voltage of 6-35kV according to claim 6, wherein: and a fourth fireproof silicon rubber tape wrapping layer is arranged between the armor layer and the outer sheath.
8. The polypropylene insulated fireproof power cable with the rated voltage of 6-35kV according to claim 1, wherein: the outer sheath is made of low-smoke halogen-free flame-retardant material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123122800.5U CN216487364U (en) | 2021-12-14 | 2021-12-14 | A polypropylene insulated fire-resistant power cable with a rated voltage of 6~35kV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123122800.5U CN216487364U (en) | 2021-12-14 | 2021-12-14 | A polypropylene insulated fire-resistant power cable with a rated voltage of 6~35kV |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216487364U true CN216487364U (en) | 2022-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123122800.5U Active CN216487364U (en) | 2021-12-14 | 2021-12-14 | A polypropylene insulated fire-resistant power cable with a rated voltage of 6~35kV |
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| CN (1) | CN216487364U (en) |
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2021
- 2021-12-14 CN CN202123122800.5U patent/CN216487364U/en active Active
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