CN1179819C - Welding method and special device for high temperature superconducting power cable joint - Google Patents
Welding method and special device for high temperature superconducting power cable joint Download PDFInfo
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- CN1179819C CN1179819C CNB011345497A CN01134549A CN1179819C CN 1179819 C CN1179819 C CN 1179819C CN B011345497 A CNB011345497 A CN B011345497A CN 01134549 A CN01134549 A CN 01134549A CN 1179819 C CN1179819 C CN 1179819C
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- 238000003466 welding Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 7
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 13
- 229910001316 Ag alloy Inorganic materials 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 1
- 238000004381 surface treatment Methods 0.000 claims 1
- 229910000679 solder Inorganic materials 0.000 abstract description 15
- 238000009529 body temperature measurement Methods 0.000 abstract description 5
- 230000004907 flux Effects 0.000 abstract description 4
- 230000008018 melting Effects 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 4
- 238000012827 research and development Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002887 superconductor Substances 0.000 description 2
- 241001124569 Lycaenidae Species 0.000 description 1
- 229910020816 Sn Pb Inorganic materials 0.000 description 1
- 229910020836 Sn-Ag Inorganic materials 0.000 description 1
- 229910020922 Sn-Pb Inorganic materials 0.000 description 1
- 229910020988 Sn—Ag Inorganic materials 0.000 description 1
- 229910008783 Sn—Pb Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 235000014987 copper Nutrition 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
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- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
本发明高温超导电力电缆接头的焊接方法及其专用装置，包括新的焊料、助焊剂、焊接工艺方法和专用设备。焊料为In-Ag，其熔点温度低、接头电阻小、分散性小。助焊剂用磷酸溶液，浓度约为20%。焊接专用装置包括调压器、温度测量控制器和加热器。加热器的座体上有加热元件对电缆接头施焊处加热，有温度传感器、温度测量控制器和调压器控制加热温度。采用本发明焊接工艺、焊料、助焊剂和专用设备，在1m/1kA高温超导电缆上获得总接头(两个接头)的电阻为0.06μΩ，在6m/2kA高温超导电缆上获得总接头(两个接头)电阻为0.1μΩ的好结果。
The invention relates to a welding method and a special device for a high-temperature superconducting power cable joint, including new solder, flux, a welding process and special equipment. The solder is In-Ag, which has a low melting point, low joint resistance, and low dispersion. Flux with phosphoric acid solution, the concentration is about 20%. Welding special devices include pressure regulators, temperature measurement controllers and heaters. There is a heating element on the base of the heater to heat the welding place of the cable joint, and a temperature sensor, a temperature measurement controller and a voltage regulator are arranged to control the heating temperature. Adopt welding technique of the present invention, solder, flux and special equipment, the resistance that obtains total joint (two joints) on 1m/1kA high-temperature superconducting cable is 0.06 μ Ω, and obtains total joint (two joints) on 6m/2kA high-temperature superconducting cable ( good results with a resistance of 0.1 µΩ.
Description
Technical field
The invention belongs to the superconducting technology technology, relate to the welding method and the special welding equipment thereof of high-temperature superconductive power cable joint, be mainly used in the welding of high-temperature superconductive power cable joint, be applicable to that also the ask for something welding temperature is lower than 160 ℃ joint welding.
Background technology
Adopt high-temperature superconductive power cable can realize low-loss, large capacity transmission, reduce operating cost greatly, application prospect is very good.The country of each advanced technology is all carrying out relevant research and development unexpectedly mutually, and wherein, the welding of high-temperature superconductive power cable is one of key technology of research and development.
High-temperature superconductive power cable (being referred to as cable during hereafter) is formed by the coiling of many superconduction bands.Major requirement to the cable connector welding is:
(1) resistance value of cable welding point is as much as possible little, and the thermal losses of cable connector improves the stability of cable operation when moving to reduce, and the resistance value of cable connector generally requires less than 1 μ Ω.
(2) welding temperature will be controlled at below 160 ℃, in order to avoid destroy the electric conductivity of superconductor.
(3) easy, reliable, the easy enforcement of welding operation.
Solder is the lower welding method of welding temperature, and it is to utilize eutectic solder and weldment to heat together, soaks into and fill up the gap of weldment junction behind the solder fusing, forms firm combination.Yet existing solder technology comprises that needed scolder of welding and welding technique all can not satisfy the welding requirements of high-temperature superconductive power cable joint.The subject matter that exists is: the fusing point of commercially available scolder generally all is higher than 180 ℃, and the resistance of welding point is also bigger, and superconductor welds under high like this temperature and will cause its electric conductivity to descend.Big, the poor stability of thermal losses when welding point resistance greatly then moves.Therefore the welding requirements that needs new scolder of research and development and solder technology to satisfy high-temperature superconductive cable.
Summary of the invention
The purpose of this invention is to provide a kind of welding method and isolated plant thereof of high-temperature superconductive power cable joint, comprise new scolder, scaling powder, welding technique and special equipment.
The scolder of development function admirable is the basis of implementing the high-temperature superconductive power cable joint good welds.We select the reasonable scolder of several welding performances to carry out the welding screening test, analysis according to result of the test and solder compositions phasor, make several new scolders, again to every kind of new scolder respectively welding production 8-10 sample joints and testing, sample adopts two hts band welding, the lap of splice of joint is 1cm, and table 1 is that 4 kinds of different scolder welding point sample test results compare.
The performance of several different scolder welding point samples of table 1 relatively
| Numbering | Solder compositions | Fusing point (℃) | Connection resistance (μ Ω) | Dispersed |
| 1 | Sn-Pb | 183 | 4.5 | Greatly |
| 2 | Sn-Ag | 190 | 5.6 | Greatly |
| 3 | In-Ag | 145 | 2.5 | Little |
| 4 | In-Sn | 120 | 5 | Greatly |
As seen from Table 1, the welding performance of No. 3 scolder In-Ag alloys is best, and its fusing point can satisfy the high-temperature superconductive power cable joint requirement of welding for 145 ℃ fully, and connection resistance is less, and dispersiveness is also little.In No. 3 scolder In-Ag alloys, its prescription is that Ag accounts for 3% (percentage by weight), and all the other are In.We select its scolder as cable connector for use.The purity requirement of these two kinds of materials reaches more than 99.99%.Scaling powder adopts phosphoric acid solution, and concentration is about 20%.
Because the high-temperature superconductive power cable joint welding will be welded many superconduction bands, welding procedure that needs and equipment could guarantee to obtain good welding quality.For this reason, the invention provides a cover cable connector welding dedicated device.
The present invention is used for the isolated plant of high-temperature superconductive power cable joint welding, comprises pressure regulator, temperature measurement controller and a heater.The main member of this heater comprises pedestal, heating element heater, temperature sensor and operating grip.Wherein pedestal is a cylinder or conelet degree cone, and the endoporus of its cylinder external diameter and cable leading-out end is that little gap is slidingly matched, or the circular cone endoporus of the cable leading-out end identical with tapering cooperates.Operating grip stretches out from the center of an end face of pedestal, and several heating element heaters evenly distribute and be contained in pedestal parallel with axis on the same face of cylinder.Temperature sensor is fixed on the end surface.
The welding of high-temperature superconductive power cable joint of the present invention is carried out according to the following steps:
(1) welding surface preparation: comprise the cleaning of cable socket superconducting tape and cable leading-out end is handled that the length of processing should surpass weld length.
(2) colligation and fixing: the superconducting tape of cable socket evenly distributed and with the colligation of colligation film band on the periphery of cable leading-out end, again cable socket is not fixed with dead ring at the edge at the place of welding.
(3) heating and insulation: heater is inserted in the hole of cable leading-out end, welding place is begun heating, control and keep this temperature after reaching 155 ℃;
(4) implement welding: when the temperature stabilization of welding place during, open colligation film band, coat an amount of scaling powder and scolder 155 ℃ of left and right sides, rotate cable during solder application, make scolder be full of the slit equably, scrape off excess solder with colligation film band again, and then with colligation film band tighten;
Scolder adopts the In-Ag alloy, and scaling powder adopts phosphoric acid solution, and what colligation film band was used is polyimide film material.
(5) stop heating: powered-down, take out heater from the hole of cable leading-out end;
(6) finish welding: welding point naturally cools to room temperature, takes off dead ring, and the cable connector welding is finished.
High-temperature superconductive power cable joint scolder In-Ag alloy melting point temperature of the present invention is low, connection resistance is less, dispersiveness is little, and the scaling powder of selecting for use is effective, and welding dedicated device is simply suitable.Adopt welding procedure of the present invention, scolder, scaling powder and isolated plant, obtaining total joint (two joints) resistance on the 1m/1kA high-temperature superconductive power cable is 0.06 μ Ω.The connection resistance that obtains total joint (two joints) on the 6m/2kA high-temperature superconductive power cable is 0.1 μ Ω, and external similar connection resistance is several μ Ω, proves that thus the inventive method and device are advanced.
Description of drawings
Fig. 1 high-temperature superconductive power cable joint welding isolated plant theory diagram.
The working state figure of Fig. 2 high-temperature superconductive power cable joint welding isolated plant heater.
Fig. 3 is an A-A cutaway view among Fig. 2.
The specific embodiment
The high-temperature superconductive power cable joint scolder that is used for provided by the invention is the In-Ag alloy, and the percentage by weight of its component is that Ag accounts for 3%, and all the other are In.Require the purity of these two kinds of materials to reach more than 99.99%.
Scaling powder provided by the invention is a phosphoric acid solution, and concentration is about 20%.
See also accompanying drawing.Fig. 1 shows cable connector solder isolated plant theory diagram of the present invention.Single phase alternating current power supply 10 gives pressure regulator 20 power supplies, the heating element heater 17 (Fig. 2) that pressure regulator 20 connects in heating voltage display 40 and the heater 30, and temperature measurement controller 50 connects heater 30, detects the welding temperature.
In the heater of cable connector welding isolated plant of the present invention shown in Figure 2, cable leading-out end 11 usefulness red coppers are made, and are cylindrical tube shape, and there is step on the surface, and step low part is the place that is welded to connect of cable leading-out end 11 and superconducting tape 13.The endoporus of cable leading-out end 11 is cylindrical hole or conelet degree taper hole.In the endoporus of the pedestal 12 insertion cable leading-out ends 11 of heater 30 welding place is heated.
As shown in Figures 2 and 3, the main member of heater 30 comprises pedestal 12, heating element heater 17 and operating grip 16 in the cable connector welding isolated plant of the present invention.Pedestal 12 is cylinder or conelet degree cones that red copper is made, and be slidingly matched for little gap between the endoporus of its external diameter and cable leading-out end 11, or the two is the conical bore cooperation of little tapering.Operating grip 16 stretches out from an end face (being the left side the figure) center of pedestal 12.Several heating element heaters 17 (among the figure being four) evenly distribute and parallel to the axis on the same face of cylinder and are contained in the pedestal 12.Temperature sensor 18 is contained in the surface of cable leading-out end 11.
The process example of implementing the cable connector welding with special welding device of the present invention, scolder and solder flux is summarized as follows (referring to Fig. 2 and Fig. 3):
(1) cable connector welding surface preparation:
The superconducting tape 13 of cable is the B based high-temperature superconductive strip, and every weld is all clean with the fine sandpaper polishing, and tentatively hangs up the very thin scolder of one deck 14 on the surface.Cable leading-out end 11 is the red copper material, and is clean with the fine sandpaper polishing.Weld length is about 15～20mm, and clean treated length should note not wanting damage wires greater than weld length in processing procedure.
(2) colligation and fixing: superconducting tape 13 is evenly arranged around cable socket, and with 19 colligations of colligation film band at cable leading-out end 11 periphery step low parts.Again cable socket is not fixed with dead ring 15 at the edge at the place of welding.
Weld heating: the pedestal 12 of heater is inserted in the hole of cable leading-out end 11, connect power supply 10, the output voltage of regulating pressure regulator 20 is to heating element heater 17 power supplies, temperature measurement controller 50 Monitoring and Controlling temperature-rise periods.
In the present embodiment, intensification initial adjustment voltage is 160V, approximately needs 8 minutes, and the temperature of cable leading-out end 11 reaches about 150 ℃.
(4) insulation welding:
Pressure regulator voltage is lowered to about about 80V by about 160V, and the temperature of control and maintenance cable leading-out end 11 is about 155 ℃.
Open colligation film band 19, coat an amount of scaling powder and scolder 14, will rotate cable when smearing scolder, make scolder be full of the slit equably, and scrape off excess solder with colligation film band in welding place, and then with colligation film band tighten.
(5) stop heating: powered-down 10.
Stop 11 heating of cable leading-out end, and heater 30 is taken out from cable leading-out end 11.
(6) finish welding: welding point naturally cools to room temperature, takes off dead ring 15, and the cable connector welding is finished.
Claims (5)
1. the welding method of high-temperature superconductive power cable joint is characterized in that carrying out according to the following steps:
(1) welding surface treatment: comprise that to the processing of end superconducting tape and the processing of cable leading-out end, the length of processing should surpass weld length;
(2) colligation and fixing: the superconducting tape of cable socket is evenly distributed, use the colligation of colligation film band on the periphery of cable leading-out end; Again not fixing with dead ring at the edge at the place of welding at cable socket;
(3) weld heating: heater is inserted welding place, promptly in the hole of cable leading-out end, welding place is begun heating, the control heating-up temperature is raised to 155 ℃ and keep this temperature;
(4) insulation welding and be coated with scolder and scaling powder: when the temperature stabilization of welding place during at 155 ℃, open colligation film band, coat an amount of scolder and scaling powder, scolder adopts the In-Ag alloy, and scaling powder adopts phosphoric acid solution, and order is first prefluxing, scolder on the back, rotate cable during last scolder, make scolder be full of the slit equably, and then with colligation film band tighten;
(5) stop heating: powered-down, stop heating, heater is taken out from cable leading-out end hole;
(6) joint cooling, finish welding: welding point naturally cools to room temperature, takes off dead ring, and the cable connector welding is finished.
2. according to the welding method of the described high-temperature superconductive power cable joint of claim 1, it is characterized in that the weight percentages of components of scolder In-Ag alloy is: Ag accounts for 3%, and all the other are In, and the purity requirement of these two kinds of materials reaches more than 99.99%.
3. according to the welding method of the described high-temperature superconductive cable joint of claim 1, it is characterized in that scaling powder adopts phosphoric acid solution, its concentration is about 20%.
4. according to the welding method of the described high-temperature superconductive cable joint of claim 1, what it is characterized in that colligation film band uses is polyimide film material.
5. the isolated plant that is used for the high-temperature superconductive power cable joint welding, comprise the single-phase voltage regulating device, temperature survey and controller, it is characterized in that having one heater dedicated, its main member comprises pedestal, heating element heater, temperature sensor and operating grip, wherein pedestal is a cylinder, or conelet degree cone, the endoporus of its cylinder external diameter and cable leading-out end is that little gap is slidingly matched, or the circular cone endoporus of the cable leading-out end identical with tapering cooperates, operating grip stretches out from the center of an end face of pedestal, several heating element heaters evenly distribute and parallel to the axis by the same face of cylinder and are contained in the pedestal, and temperature sensor is contained in the surface of cable leading-out end.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011345497A CN1179819C (en) | 2001-11-07 | 2001-11-07 | Welding method and special device for high temperature superconducting power cable joint |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011345497A CN1179819C (en) | 2001-11-07 | 2001-11-07 | Welding method and special device for high temperature superconducting power cable joint |
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| CN1416991A CN1416991A (en) | 2003-05-14 |
| CN1179819C true CN1179819C (en) | 2004-12-15 |
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Cited By (1)
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| CN101794655A (en) * | 2010-03-12 | 2010-08-04 | 中国科学院电工研究所 | Method for manufacturing low-resistance superconducting joint with high shielding characteristic |
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2001
- 2001-11-07 CN CNB011345497A patent/CN1179819C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101794655A (en) * | 2010-03-12 | 2010-08-04 | 中国科学院电工研究所 | Method for manufacturing low-resistance superconducting joint with high shielding characteristic |
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