CN210837263U

CN210837263U - Electric heater cable for voltage stabilizer of nuclear power station

Info

Publication number: CN210837263U
Application number: CN201922372280.XU
Authority: CN
Inventors: 倪勇; 刘旌平; 洪宁宁
Original assignee: Shanghai Electric Cable Research Institute
Current assignee: Shanghai Electric Cable Research Institute
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-06-23
Anticipated expiration: 2029-12-26

Abstract

The utility model provides a nuclear power station voltage stabilizer electric heater cable, which comprises a cable core, a belting layer and a metal shielding layer, wherein the belting layer and the metal shielding layer are sequentially wrapped outside the cable core; the wire core comprises a conductor, and an inner liner, an insulating layer and an outer liner which are sequentially wrapped outside the conductor; the conductor is formed by twisting a plurality of nickel-plated copper wires; the insulating layer is a silicon rubber extrusion layer; the inner lining layer and the outer lining layer are polyimide wrapping tape wrapping layers; the belting layer is a flame-retardant non-woven fabric lapping layer; the metal shielding layer is a stainless steel wire braided layer. The utility model discloses a nuclear power station stabiliser electric heater cable, the crowded covering of silicon rubber make the cable have good high temperature resistance and radiation resistance, and polyimide band can reduce the effect of the external mechanical stress that the crowded covering of silicon rubber received in the use around the covering, prolongs its life to the high temperature resistance and the radiation resistance of cable have been improved to a certain extent.

Description

Electric heater cable for voltage stabilizer of nuclear power station

Technical Field

The utility model relates to the technical field of cables, especially, relate to a nuclear power station stabiliser electric heater cable.

Background

In nuclear power engineering under construction, the adopted electric heater cable products are imported from three companies such as France, America and the like, are imported along with a voltage stabilizer heating element, are small in using amount, high in price and long in purchase period, have certain difficulty and equivalent workload in each link of research and development, structural design, production process and test evaluation, and belong to products with small quantity and high technical content. The related technical parameters provided by suppliers are fuzzy and dull correspondingly, and a technical black box exists, particularly on the index parameters of heat resistance and irradiation resistance. Even part of nuclear power engineering can not solve the problem of the cable, so that the localization process of the whole equipment of the voltage stabilizer is delayed. In view of the technical innovation of the third-generation nuclear power plant, it is necessary to carry out deep reliability research while carrying out localization, so as to solve the localization problem of the electric heater cable.

The cable is used as a blood vessel and nerve cable of a nuclear power system, and plays an important role in ensuring the long-term safe operation and shutdown of a nuclear power station. The cable of the electric heater of the voltage stabilizer in the nuclear power plant has rigorous use occasions and higher requirements on safety performance, has the requirements on conventional halogen-free, low smoke, single and bundled flame retardance and the like of the cable, and also has the requirement that the identification life is not less than 60 years at the highest operating temperature of a conductor, and passes gamma-ray irradiation aging test, flexible retention test and the like of at least 1000 kGy. Therefore, how to design a nuclear power plant voltage stabilizer electric heater cable with excellent heat resistance and irradiation resistance is a problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a nuclear power station voltage stabilizer electric heater cable having excellent heat resistance and irradiation resistance.

In order to solve the technical problem, the utility model provides an electric heater cable for a voltage stabilizer of a nuclear power station, which comprises a cable core, a belting layer and a metal shielding layer, wherein the belting layer and the metal shielding layer are sequentially wrapped outside the cable core; the wire core comprises a conductor, and an inner liner, an insulating layer and an outer liner which are sequentially wrapped outside the conductor; the conductor is formed by twisting a plurality of nickel-plated copper wires; the insulating layer is a silicon rubber extrusion layer; the inner lining layer and the outer lining layer are polyimide wrapping tape wrapping layers; the belting layer is a flame-retardant non-woven fabric lapping layer; the metal shielding layer is a stainless steel wire braided layer.

Preferably, the cable core is formed by twisting two to five wire cores, and a flame-retardant filling layer is filled between the belting layer and each wire core.

Further, the flame-retardant filling layer is a flame-retardant glass fiber filling layer.

Preferably, the cable core comprises a cable core, and a flame-retardant woven layer is further arranged between the cable core and the wrapping tape layer.

Further, the flame-retardant woven layer is a flame-retardant glass fiber woven layer impregnated with high-temperature insulating paint.

Preferably, the nickel-plated copper wire is a grade 27 nickel-plated copper wire.

Preferably, the lining layer is a sintered polyimide tape wrapping layer.

Preferably, the outer lining layer is a non-sinterable polyimide tape wrapping layer.

Preferably, the stainless steel wire woven layer is an austenitic stainless steel wire woven layer.

As above, the utility model discloses a nuclear power station stabiliser electric heater cable has following beneficial effect:

by adopting the electric heater cable of the voltage stabilizer of the nuclear power station, the cable has good high temperature resistance and radiation resistance due to the silicon rubber extrusion layer, the polyimide wrapping layer can reduce the action of external mechanical stress on the silicon rubber extrusion layer in the using process, the service life of the cable is prolonged, and the high temperature resistance and radiation resistance of the cable are improved to a certain extent; the utility model has the characteristics of there is not steamed, low cigarette, single and the beam forming is fire-retardant, and its appraisal life-span is no less than 60 years under the conductor operation highest operating temperature to gamma-ray irradiation ageing tests and flexibility through 1000kGy at least keep experimental, satisfy the security performance requirement of nuclear power station stabiliser electric heater cable.

Drawings

FIG. 1 is a schematic diagram of an embodiment of a nuclear power plant regulator electric heater cable according to the present invention;

fig. 2 is a schematic structural diagram of another embodiment of the electric heater cable for the voltage stabilizer of the nuclear power plant according to the present invention.

Description of the reference numerals

1 Cable core

110 wire core

111 conductor

112 inner liner

113 insulating layer

114 outer liner

120 flame-retardant braided layer

130 flame-retardant filling layer

2 layer of wrapping

3 Metal Shielding layer

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

Please refer to the attached drawings. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve.

Example one

As shown in fig. 1, the embodiment provides a nuclear power station voltage stabilizer electric heater cable, which includes a cable core 1, and a belting layer 2 and a metal shielding layer 3 sequentially wrapped outside the cable core 1, wherein the cable core 1 includes a wire core 110; the wire core 110 comprises a conductor 111, and an inner lining layer 112, an insulating layer 113 and an outer lining layer 114 which are sequentially wrapped outside the conductor 111; a flame-retardant braided layer 120 is also arranged between the wire core 110 and the wrapping layer 2; the conductor 111 is twisted from a plurality of nickel-plated copper wires; the insulating layer 113 is a silicone rubber extrusion coating; the inner lining layer 112 and the outer lining layer 114 are both polyimide tape wrapping layers; the belting layer 2 is a flame-retardant non-woven fabric lapping layer; the metal shielding layer 3 is a stainless steel wire braid layer.

In order to improve the flame retardant property of the flame retardant woven layer 120, the flame retardant woven layer 120 in this embodiment is a flame retardant glass fiber woven layer impregnated with a high temperature insulating varnish.

In the embodiment, the nickel-plated copper wire is a 27-grade nickel-plated copper wire, the electroplated layer of the 27-grade nickel-plated copper wire accounts for 27% of the weight of the nickel-plated copper wire, and the nickel-plated copper wire has good corrosion resistance and high temperature resistance, so that the conductor 111 can normally work in an extremely cold and extremely hot environment between-60 ℃ and 750 ℃, and the conductor 111 is effectively prevented from being oxidized.

In this embodiment, in order to make the conductor 111 and the insulating layer 113 adhere to each other more tightly, the lining layer 112 is a sinterable polyimide tape wrapping layer, and is subjected to sintering treatment after wrapping. The sintered polyimide wrapping tape has higher density of the wrapping layer, and is not easy to slip off when wrapped on the conductor 111, thereby realizing better wrapping insulation effect.

In this embodiment, the outer liner 114 is a non-sinterable polyimide tape wrapping.

In this embodiment, in order to make the stainless steel wire braid resistant to high temperature and chemical solution corrosion and have good toughness, the stainless steel wire braid adopts an austenitic stainless steel wire braid.

The conductor 111 made of nickel-plated copper wire of the electric heater cable for the voltage stabilizer of the nuclear power station of the utility model has good wear resistance and corrosion resistance; the silicone rubber wrapping layer enables the cable to have good high temperature resistance and radiation resistance, the polyimide wrapping layer can reduce the action of external mechanical stress on the silicone rubber wrapping layer in the using process, the service life of the polyimide wrapping layer is prolonged, and the high temperature resistance and radiation resistance of the cable are improved to a certain extent; combine fire-retardant weaving layer 120, fire-retardant non-woven fabrics to make around covering and stainless steel wire weaving layer the utility model has the characteristics of there is not steamed, low cigarette and fire-retardant, through Arrhenius formula accelerated thermal ageing test evaluation, its appraisal life-span is no less than 60 years under conductor 111 operation maximum operating temperature to gamma-ray irradiation ageing test and flexibility through 1000kGy at least keep experimental, satisfy requirements such as accident condition and environmental protection of nuclear power station stabiliser electric heater cable.

Example two

As shown in fig. 2, the electric heater cable of the nuclear power station voltage stabilizer of this embodiment includes cable core 1 and wraps up band layer 2, metal shielding layer 3 in cable core 1 outside in proper order, and cable core 1 is formed by five sinle silks 110 transposition, and it has fire-retardant filling layer 130 to fill between band layer 2 and each sinle silk 110, and is concrete, in order to promote the flame retardant efficiency of fire-retardant filling layer 130, and fire-retardant filling layer 130 is fire-retardant glass silk filling layer, and fire-retardant glass silk filling layer also has low cigarette and halogen-free characteristics simultaneously. The structure and material of the core 110 are the same as those of the first embodiment, and the wrapping tape layer 2 and the metal shielding layer 3 are also the same as those of the first embodiment.

The utility model provides a stabiliser electric heater cable satisfy nuclear power engineering stabiliser electric heater cable's needs in the key technology of design, manufacturing and each link of experiment, possess stronger market competition, break the market monopoly of foreign enterprise to stabiliser electric heater cable.

The utility model is beneficial to deeply understanding the development and manufacture of nuclear power equipment from the technical connotation, improving the reliability of the nuclear power equipment and being beneficial to breaking through the technical bottleneck which restricts the large-scale development of the nuclear power industry in China for a long time to a certain extent; meanwhile, according to the technical development requirements of technical digestion, absorption and re-innovation of third-generation nuclear power, development and continuous innovation of a great special engineering technology are supported from the level of a basic theory, and the level of high-temperature cables and electrical materials in China is improved.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The utility model provides a nuclear power station stabiliser electric heater cable, includes the cable core and wraps up band layer, the metal shielding layer in the cable core outside in proper order, its characterized in that:

the cable core comprises one to five wire cores;

the wire core comprises a conductor, and an inner liner, an insulating layer and an outer liner which are sequentially wrapped outside the conductor;

the conductor is formed by twisting a plurality of nickel-plated copper wires;

the insulating layer is a silicon rubber extrusion layer;

the inner lining layer and the outer lining layer are polyimide wrapping tape wrapping layers;

the belting layer is a flame-retardant non-woven fabric lapping layer;

the metal shielding layer is a stainless steel wire braided layer.

2. The nuclear power plant regulator electric heater cable of claim 1, wherein: the cable core is formed by twisting two to five wire cores, and a flame-retardant filling layer is filled between the belting layer and each wire core.

3. The nuclear power plant regulator electric heater cable of claim 2, wherein: the flame-retardant filling layer is a flame-retardant glass fiber filling layer.

4. The nuclear power plant regulator electric heater cable of claim 1, wherein: the cable core includes a sinle silk, still be equipped with fire-retardant weaving layer between sinle silk and the band layer.

5. The nuclear power plant regulator electric heater cable of claim 4, wherein: the flame-retardant woven layer is a flame-retardant glass fiber woven layer impregnated with high-temperature insulating paint.

6. The nuclear power plant regulator electric heater cable of claim 1, wherein: the nickel-plated copper wire is a 27-grade nickel-plated copper wire.

7. The nuclear power plant regulator electric heater cable of claim 1, wherein: the inner liner is a sintered polyimide wrapping tape wrapping layer.

8. The nuclear power plant regulator electric heater cable of claim 1, wherein: the outer lining layer is a polyimide wrapping tape wrapping layer which cannot be sintered.

9. The nuclear power plant regulator electric heater cable of claim 1, wherein: the stainless steel wire woven layer is an austenitic stainless steel wire woven layer.