CN211350193U - High-voltage pulse transmission cable - Google Patents
High-voltage pulse transmission cable Download PDFInfo
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- CN211350193U CN211350193U CN201922304392.1U CN201922304392U CN211350193U CN 211350193 U CN211350193 U CN 211350193U CN 201922304392 U CN201922304392 U CN 201922304392U CN 211350193 U CN211350193 U CN 211350193U
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Abstract
The utility model relates to a high-voltage pulse transmission cable, high-voltage pulse transmission cable comprises inner conductor, interior semiconduction shielding layer, insulating layer, outer semiconduction shielding layer, outer conductor, sheath from inside to outside in proper order. The utility model discloses a cable has stable high-voltage pulse signal transmission performance, introduces inside and outside semi-conductive shielding layer, has avoided the direct contact between inner conductor and insulating layer, insulating layer and the outer conductor, avoids the production of air gap, and the homogenization electric field has improved the reliability to through the design to selecting materials, cable structure, technological method, make cable electric field homogenization, satisfy withstand voltage level 600 kV's user demand.
Description
Technical Field
The utility model belongs to the cable field, concretely relates to high-voltage pulse transmission cable field.
Background
With the development of industrial, agricultural and scientific technologies, especially the needs of military industry, the radio pulse technology has been widely applied to various electronic devices such as radars, televisions, electronic computers, and the like. High-voltage pulse technology is also widely applied to the atomic energy industry plasma physics and accelerator technology, and a high-voltage pulse cable is specially used for transmitting various high-voltage pulses. The high-voltage pulse cable is firstly applied to radar equipment, a series of pulse cables for radar appear, and then a high-voltage pulse cable for an accelerator appears due to the development of plasma physics and accelerator technologies. With the development of pulse technology to high voltage, narrow pulse and instantaneous high power, the requirements of high voltage resistance, low attenuation, low impedance, high shielding property and the like are also put forward for high voltage pulse cables.
At present, high-voltage pulse transmission cables with withstand voltage grades of 150kV, 250kV, 300kV, 400kV and the like exist in China. For the high-voltage pulse transmission cable with lower voltage-resistant grade, the technical processes of structural design and production and manufacturing are mature, and the application is wide.
However, with the deepening of high-energy physical research, higher requirements are put forward on the voltage withstanding grade of the high-voltage pulse transmission cable, the design and production difficulty of the cable is greatly increased due to the improvement of the voltage withstanding grade, the high-voltage pulse transmission cable which can reach 600kV does not exist in the prior art, and the technical blank is urgently needed to be filled.
In order to enable the cable to meet the requirement of 600kV voltage-resistant grade, the cable structure design needs to inhibit partial discharge of the cable to the maximum extent, avoid breakdown, improve the insulation consistency of the cable as much as possible, and avoid insulation defects so as to meet the voltage-resistant requirement. However, the partial discharge of the existing high-voltage transmission cable structure is obviously increased along with the increase of the applied voltage, which causes the cable breakdown. And the existing insulation extrusion processing mode can not avoid impurity mixing to cause insulation defect, thereby greatly reducing the insulation high-voltage tolerance capability.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that prior art exists is overcome, a high-voltage pulse transmission cable is provided to solve and still not to have among the prior art and to reach 600kV high-voltage pulse transmission cable, can't satisfy the problem of user demand in the high energy physics field.
For solving the technical problem, the technical solution of the utility model is realized as follows:
a high-voltage pulse transmission cable is characterized in that: the high-voltage pulse transmission cable sequentially comprises an inner conductor 1, an inner semi-conductive shielding layer 2, an insulating layer 3, an outer semi-conductive shielding layer 4, an outer conductor 5 and a sheath 6 from inside to outside.
Further, the inner semiconductive shielding layer 2 is semiconductive polyolefin and has a volume resistivity at 20 ℃ of not more than 60 Ω · cm, the outer semiconductive shielding layer 4 is strippable semiconductive polyolefin and has a volume resistivity at 20 ℃ of not more than 60 Ω · cm, and the peel strength of the outer semiconductive shielding layer 4 is not more than 20N/cm.
Further, the insulating layer 3 is crosslinked polyethylene or ultrapure polyethylene containing impurity particles of not more than 100 μm.
Further, the outer conductor 5 and the inner conductor 1 are both made of pure copper.
Further, the sheath 6 is polyethylene.
The utility model discloses a cable has stable high-voltage pulse signal transmission performance, introduces inside and outside semi-conductive shielding layer, has avoided the direct contact between inner conductor and insulating layer, insulating layer and the outer conductor, avoids the production of air gap, and the homogenization electric field has improved the reliability to through the design to selecting materials, cable structure, technological method, make cable electric field homogenization, satisfy withstand voltage level 600 kV's user demand.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural view of the high-voltage pulse transmission cable of the present invention;
FIG. 2 is a flow chart of the manufacturing process of the high-voltage pulse transmission cable of the present invention;
in the figure:
1 inner conductor 2 inner semiconductive shield 3 insulating layer
4 outer semi-conductive shield layer 5 outer conductor 6 sheath
Detailed Description
To further explain the technical means, creation features, achievement objectives and functions of the present invention, the following detailed description will be made in conjunction with the accompanying drawings and preferred embodiments for the specific implementation, structure, features and functions of the high voltage pulse transmission cable according to the present invention.
Example 1
A high-voltage pulse transmission cable sequentially comprises an inner conductor 1, an inner semi-conductive shielding layer 2, an insulating layer 3, an outer semi-conductive shielding layer 4, an outer conductor 5 and a sheath 6 from inside to outside. The inner semiconductive shielding layer 2 is semiconductive polyolefin and has a volume resistivity of 60 Ω · cm at 20 ℃, the outer semiconductive shielding layer 4 is strippable semiconductive polyolefin and has a volume resistivity of 60 Ω · cm at 20 ℃, and the peel strength of the outer semiconductive shielding layer 4 is 20N/cm. The insulating layer 3 is cross-linked polyethylene. The outer conductor 5 and the inner conductor 1 are both made of pure copper. The jacket 6 is polyethylene.
The preparation method of the high-voltage pulse transmission cable comprises the following steps:
step one, twisting an inner conductor, and extruding an inner semi-conductive shielding layer, an insulating layer and an outer semi-conductive shielding layer simultaneously, wherein the steps are as follows: the selected section area is 160mm2The pure copper stranded wire is used as an inner conductor, and is respectively arranged outside the inner conductorExtruding the inner semiconductive shielding layer, the insulating layer and the outer semiconductive shielding layer simultaneously by using phi 45, phi 150 and phi 80 extruders; and monitoring the insulation outer diameter and the insulation concentricity by using an online diameter measuring instrument and an online concentricity tester in the three-layer synchronous extrusion process, and controlling the insulation outer diameter to be 60.5mm and the insulation concentricity to be 85 percent.
Step two, segmented gradient cooling, namely after the cable three-layer co-extrusion in the step one, the prepared cable is cooled step by step through a cooling water tank with the temperature gradually decreased from high to low in a step manner by adopting a segmented gradient cooling process; the sectional gradient cooling comprises four-section water tank cooling, and the temperature of the cable passing through the water tank is 90 ℃, 75 ℃, 60 ℃ and 30 ℃ in sequence so as to avoid insulation deformation and stress residue caused by quenching.
Step three, wrapping the outer conductor, specifically:
after the cable is cooled in the second step, the copper strip is adopted to wrap the outer conductor, the wrapping and covering rate is 10%, and the outer diameter of the cable after wrapping is 64 mm; the outer conductor is wrapped by a pure copper belt with the thickness of 1 multiplied by 100mm, and the covering rate is more than 20%.
Step four, extruding a sheath layer, specifically:
extruding an outer sheath for the cable after the outer conductor is wrapped in the third step, wherein the outer diameter of the cable after the sheath is extruded is 78mm, and the thickness of the sheath is 3 mm;
fifthly, heat release gas treatment, which specifically comprises the following steps:
the cable finished product is subjected to heat release process treatment, the heat release process adopts a high-temperature oven to bake the cable for a certain time so as to achieve the effect of eliminating impurities and air gaps inside the cable insulation, the heat release treatment temperature is set to be 65 ℃, and the treatment time is more than 120 h.
In the embodiment 1, the cable conductor core is made of a pure copper conductor, the insulating material is made of crosslinked polyethylene, the inner semi-conductive shielding layer is made of semi-conductive polyolefin, the outer semi-conductive shielding layer is made of strippable semi-conductive polyolefin, the outer conductor is made of a pure copper strip, and the sheath is made of polyethylene. The semi-conductive shielding layer, the insulation layer and the outer semi-conductive shielding layer in the cable adopt a three-layer co-extrusion technology, phi 45, phi 150 and phi 80 extruders extrude together, an online diameter measuring instrument and an online concentricity tester are adopted in the extrusion process, the insulation outer diameter and the insulation concentricity are monitored in real time and fed back, the temperature of the cooling water tank is gradually reduced from high to low in a step-type manner, and the cable is cooled step by step. The outer conductor is wrapped by a pure copper belt of 1 multiplied by 100mm, and the covering rate is 20%. The sheath adopts an extrusion molding mode. And finally, the formed cable is subjected to a heat-releasing gas process, and is placed in a constant-temperature oven at 65-75 ℃ for more than 120 hours. The prepared cable meets the characteristic impedance of 50 omega and the voltage withstanding grade of 600 kV.
Example 2
A high-voltage pulse transmission cable is composed of an inner conductor 1, an inner semi-conductive shielding layer 2, an insulating layer 3, an outer semi-conductive shielding layer 4, an outer conductor 5 and a sheath 6 from inside to outside in sequence.
The inner semiconductive shielding layer 2 is semiconductive polyolefin and has a volume resistivity of 45 Ω · cm at 20 ℃, the outer semiconductive shielding layer 4 is strippable semiconductive polyolefin and has a volume resistivity of 30 Ω · cm at 20 ℃, and the peel strength of the outer semiconductive shielding layer 4 is 20N/cm. The insulating layer 3 is ultra-pure polyethylene containing impurity particles of not more than 100 μm. The outer conductor 5 and the inner conductor 1 are both made of pure copper. The jacket 6 is polyethylene.
Embodiment 2 a method for preparing a high voltage pulse transmission cable, comprising the steps of:
step one, twisting an inner conductor, and extruding an inner semi-conductive shielding layer, an insulating layer and an outer semi-conductive shielding layer simultaneously, wherein the steps are as follows: selecting the cross section area of 200mm2The pure copper stranded wire is used as an inner conductor, and a phi 45 extruder, a phi 150 extruder and a phi 80 extruder are respectively used for extruding an inner semiconductive shielding layer, an insulating layer and an outer semiconductive shielding layer at the same time outside the inner conductor; and monitoring the insulation outer diameter and the insulation concentricity by using an online diameter measuring instrument and an online concentricity tester in the three-layer synchronous extrusion process, and controlling the insulation outer diameter to be 63.5mm and the insulation concentricity to be 90%.
Step two, sectional gradient cooling, which specifically comprises the following steps:
after the first cable three-layer co-extrusion, a segmented gradient cooling process is adopted, and the prepared cable is cooled step by step through a cooling water tank with the temperature gradually decreased from high to low in a step manner; the sectional gradient cooling comprises four-section water tank cooling, and the temperature of the cable passing through the water tank is 95 ℃, 80 ℃, 65 ℃ and 35 ℃ in sequence so as to avoid insulation deformation and stress residue caused by quenching.
Step three, wrapping the outer conductor, specifically: after the cable is cooled in the second step, an outer conductor is wrapped by a copper strip, the wrapping and covering rate is 30%, and the outer diameter of the wrapped cable is 67 mm; the outer conductor is wrapped by a pure copper belt of 1 multiplied by 100mm, and the covering rate is 25%.
Step four, extruding a sheath layer, specifically: extruding an outer sheath for the cable after the outer conductor is wrapped in the third step, wherein the outer diameter of the cable after the sheath is extruded is 76mm, and the thickness of the sheath is 4 mm;
fifthly, heat release gas treatment, which specifically comprises the following steps: and (3) carrying out heat release process treatment on the cable finished product, wherein the heat release treatment temperature is 65-75 ℃, and the treatment time is more than 120 h.
The beneficial effects of the two embodiments are described as follows:
1) structural design solution
The utility model discloses the structure includes inner conductor, interior semiconduction shielding layer, insulating layer, outer semiconduction shielding layer, outer conductor and sheath, and the cable structure schematic diagram is shown in fig. 1, introduces inside and outside semiconduction shielding layer, has avoided the direct contact between inner conductor and insulating layer, insulating layer and the outer conductor, avoids the production of air gap, and the homogenization electric field has improved the reliability.
2) Raw material solution
The insulating material is preferably crosslinked polyethylene, the mechanical property, the electrical property, the temperature-resistant grade and the environmental cracking resistance of the polyethylene are greatly improved after the polyethylene is crosslinked, and compared with a common polyethylene insulated cable, the cable adopting the crosslinked polyethylene as the insulating material has higher voltage-resistant grade on the premise of the same structure and size; the inner semi-conductive shielding layer material is selected from semi-conductive polyolefin, which has the similar compatible characteristic with polyolefin materials, can be tightly combined with insulation, and can better play a role in homogenizing an electric field; the outer semi-conductive shielding layer is made of strippable semi-conductive polyolefin, and the strippable characteristic of the outer semi-conductive shielding layer can facilitate the installation of a cable stripping head. In addition, the selected ultrapure polyethylene containing impurity particles not more than 100 microns can enhance the insulation and voltage resistance performance and improve the voltage resistance grade of the cable.
3) Production manufacturing solution
The utility model discloses a three-layer is crowded technology altogether, and interior semiconduction shielding layer, main insulation, outer semiconduction shielding layer once only extrude promptly. The three-layer co-extrusion process can ensure that the inner semi-conductive shielding layer and the outer semi-conductive shielding layer form 'absolute integral' insulation with the main insulation, and obviously improves the electrical performance of cable insulation. After the three layers of the cable are co-extruded, a segmented gradient cooling process is adopted, the temperature between the segments is reduced step by step, and insulation deformation and stress residue caused by quenching are avoided. The cable finished product is processed by a 'heat release' process, so that the content of low-molecular substances in insulation is removed, and the pressure resistance of the product is further improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (5)
1. A high-voltage pulse transmission cable is characterized in that: the high-voltage pulse transmission cable is sequentially composed of an inner conductor (1), an inner semi-conductive shielding layer (2), an insulating layer (3), an outer semi-conductive shielding layer (4), an outer conductor (5) and a sheath (6) from inside to outside.
2. The high voltage pulse transmission cable according to claim 1, wherein: the inner semi-conductive shielding layer (2) is semi-conductive polyolefin and has volume resistivity at 20 ℃ of not more than 60 omega cm, the outer semi-conductive shielding layer (4) is strippable semi-conductive polyolefin and has volume resistivity at 20 ℃ of not more than 60 omega cm, and the stripping strength of the outer semi-conductive shielding layer (4) is not more than 20N/cm.
3. The high voltage pulse transmission cable according to claim 1 or 2, wherein: the insulating layer (3) is cross-linked polyethylene or ultrapure polyethylene containing impurity particles of not more than 100 μm.
4. The high voltage pulse transmission cable according to claim 1 or 2, wherein: the outer conductor (5) and the inner conductor (1) are both made of pure copper.
5. The high voltage pulse transmission cable according to claim 1, wherein: the sheath (6) is made of polyethylene.
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| CN201922304392.1U CN211350193U (en) | 2019-12-20 | 2019-12-20 | High-voltage pulse transmission cable |
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| CN201922304392.1U CN211350193U (en) | 2019-12-20 | 2019-12-20 | High-voltage pulse transmission cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110993180A (en) * | 2019-12-20 | 2020-04-10 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | High-voltage pulse transmission cable and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110993180A (en) * | 2019-12-20 | 2020-04-10 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | High-voltage pulse transmission cable and preparation method thereof |
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