CN1598974A - Cable-type thermocouple temp-measuring power cable and manufacturing processing method thereof - Google Patents
Cable-type thermocouple temp-measuring power cable and manufacturing processing method thereof Download PDFInfo
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- CN1598974A CN1598974A CN 200410041817 CN200410041817A CN1598974A CN 1598974 A CN1598974 A CN 1598974A CN 200410041817 CN200410041817 CN 200410041817 CN 200410041817 A CN200410041817 A CN 200410041817A CN 1598974 A CN1598974 A CN 1598974A
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Abstract
The thermocouple temperature measurement power cable and its manufacturing method belong to the cable technology. The cable has NTC metal oxide semiconductor, the temperature measurement organ composed of the cupro nickel outer conductor and polytetrafluoroethylene insulating layer and the power cable made of cross linking semiconductive internal shield layer, cross linking polyethylene insulating layer, cross linking semiconductive external shield layer and strip copper lapping metallic shield layer. The temperature measurement organ is wrapped and intertwisted in the middle of the three-phase core of the power cable to form the cable core and the outer surface of the cable core is wrapped by the sheath of polyvinyl chloride. The invention is featured by the reasonable and simple structure, simple production, advanced technique, low cost and good operating performance of the products. The temperature measurement organ can get the aim of inducing the high temperature when the cable is in over loading and high temperature. It can be applied to the online detection to the temperature of the cable and we can know the change of the cable's temperature, find out its malfunction and give an alarm to avoid the accidents.
Description
Technical field
The present invention relates to a kind of structure of the power cable that can make things convenient for thermometric and the method for manufacturing technology of this cable, belong to the cable technology field.
Background technology
The existing power cable type is a lot, generally is made up of conductor, conductor screen, insulation, insulation shielding, copper strips shielding, flame-retardant layer and outer jacket etc.For example the patent No. is a kind of novel flame-retardant power cable of 02264084.3, and the good flame fire protecting performance is arranged.But, along with the increase of unit capacity, the corresponding raising of automatization level, the cable consumption is more and more.A 200MW generating set, all kinds of cables reach 200～300km.2 500MW supercritical parameters of certain power plant's first stage of the project generating set, the cable consumption reaches 3000km.Because cable length increases, the also corresponding increase of the occurrence probability of its fire incident.
In a single day cable fire takes place in the thermal power plant, will cause heavy losses.Building and operating thermal power plant at present, still adopting inflammable cable mostly, the cable fire-proof problem is particularly outstanding.
The U.S. is in 3285 electrical fire accidents of 1965～1975 years statistics, and the electric wire fire incident just accounts for 30.5%, about 4,000 ten thousand dollars of direct losses.
Japan is once to factory and enterprises such as electric power, iron and steel, petrochemistry, papermaking investigation, has 78% unit that ignition of cable took place, and wherein the accident that the extent of injury is bigger accounts for 40%.
According to the interrelated data statistics, over nearly 20 years, power plants generation cable fire more than 140 time wherein reaches 75 times in the period of 1986～1992 years 7 unexpectedly.Have 24 power plant to take place 2 times and above cable fire accident, indivedual power plant reach 4～6 times.The loss that cable fire caused more than 70% is very serious, and wherein 40% fire incident causes especially big loss.In the period of 1975～1985, take place 60, cause direct and consequential damage to reach more than 50 hundred million yuan because of ignition of cable prolongs the major accident that causes of combustion.
The fire that is caused by cable fault causes large-area cable scaling loss and by forced-stopping machine, can't resume production in the short time, thereby causes heavy economic losses.By the analysis of accident, cause that fire takes place in the cable trough immediate cause is that cable intermediate joint makes that quality is bad, crimp head is tight, contact resistance is excessive, the cable end that long-time running causes is overheated to burn insulation etc.
By repeatedly accident analysis discovery, the generation main cause of fire is that quality is bad to be caused because the power cable transition joint is made in the cable trough, and be superheated to the generation of accident from cable end, its development speed relatively slowly, the time is longer, the generation that can prevent fully, stop this type of accident by the on-line monitoring of cable system.
The crimp quality quality of cable intermediate joint, discovery can only be in operation, the overheated accident of burning of long more easy more generation running time, statistics shows the power plant after founding the factory 10 years, the cable end of making during capital construction is all changed because of the bad initiating failure of quality more than 90%.
Cable temperature monitoring method commonly used at present has:
Temperature sensing cable formula temp measuring system: with temperature sensing cable and power cable parallelization, when the power cable temperature surpassed the fixed temperature value, temperature sensing cable was by short circuit.System only can disposablely use, and can not measure the actual temperature value of cable; Because number of cables is many, system installs and maintenance work makes things convenient for inadequately, and equipment is fragile; The initial failure prediction can not be carried out, measured value can not be shown in real time, no temperature trend analysis.
The thermistor-type temp measuring system: can the displays temperature value, but because each thermistor all needs independently wiring, wiring complexity and thermistor is fragile, maintenance is big; Transducer does not possess self-checking function, needs frequent verification, therefore seldom adopts yet.
Summary of the invention
Purpose of the present invention is exactly at above-mentioned situation, develops a kind of variations in temperature of being convenient to cable temperature is carried out online detection and understanding cable, in time finds the cable formula thermocouple temperature measurement power cable and the process for making thereof of cable fault.
The objective of the invention is to be achieved through the following technical solutions:
One, cable formula thermocouple temperature measurement power cable, comprise conductor, insulation, interior external shield and oversheath, it is characterized in that cable is provided with at copper inner wire outer surface sets gradually NTC metal oxide semi-conductive layer, the temperature element that corronil outer conductor and teflon insulation layer constitute and three set gradually crosslinked semiconductive internal shield pressing twisted copper wires conductor outer surface respectively, crosslinked polyetylene insulated layer, crosslinked semiconductive outer shielding layer, the power cable that the wrapped metal screen layer of copper strips constitutes, the temperature element parcel is stranded in the centre of power cable three-phase core, and the polyvinyl chloride oversheath is arranged on the outer surface of the cable core of temperature element and power cable formation.The described section that presses the twisted copper wires conductor is greater than 25mm
2Circular.
Two, cable formula thermocouple temperature measurement power cable, comprise conductor, insulation, interior external shield and oversheath, it is characterized in that cable is provided with at copper inner wire outer surface sets gradually NTC metal oxide semi-conductive layer, the temperature element that corronil outer conductor and teflon insulation layer constitute and three set gradually crosslinked polyetylene insulated layer pressing twisted copper wires conductor outer surface respectively, the power cables that the wrapped metal screen layer of copper strips constitutes, the temperature element parcel is stranded in the centre of power cable core, and the polyvinyl chloride oversheath is arranged on the outer surface of the cable core of temperature element and power cable formation.
Three, the process for making of cable formula thermocouple temperature measurement power cable, it is characterized in that earlier prefabricated set gradually NTC metal oxide semi-conductive layer at copper inner wire outer surface, the temperature element that corronil outer conductor and teflon insulation layer constitute and set gradually crosslinked semiconductive internal shield pressing twisted copper wires conductor outer surface, crosslinked polyetylene insulated layer, crosslinked semiconductive outer shielding layer, the power cable that the wrapped metal screen layer of copper strips constitutes, on cabler, carry out concentric type and be twisted into a temperature element and be wrapped in cable core in the middle of the power cable three-phase core, extrude the polyvinyl chloride oversheath at the outer surface of cable core.Describedly set gradually NTC metal oxide semi-conductive layer, corronil outer conductor and teflon insulation layer at copper inner wire outer surface, be the NTC material to be irritated with powder type into constitute NTC metal oxide semi-conductive layer between the copper inner wire and corronil outer conductor, on drawbench, be drawn into the temperature element core of certain diameter then, on the temperature element core that draws, extrude one deck teflon insulation layer again.Describedly setting gradually crosslinked semiconductive internal shield, crosslinked polyetylene insulated layer, crosslinked semiconductive outer shielding layer, the wrapped metal screen layer of copper strips pressing twisted copper wires conductor outer surface, is to be that 1.0mm～3.0mm copper cash presses stranded section greater than 25mm through stranding machine with line diameter
2The round conductor outer surface on, extrude crosslinked semiconductive internal shield, crosslinked polyetylene insulated layer and crosslinked semiconductive outer shielding layer, wrapped copper strips metal screen layer on outer shielding layer simultaneously with three extruders.
Four, the process for making of cable formula thermocouple temperature measurement power cable, it is characterized in that setting gradually temperature element that NTC metal oxide semi-conductive layer, corronil outer conductor and teflon insulation layer constitute and setting gradually the power cable that crosslinked polyetylene insulated layer, the wrapped metal screen layer of copper strips constitute pressing twisted copper wires conductor outer surface at copper inner wire outer surface with earlier prefabricated, on cabler, carry out concentric type and be twisted into a temperature element and be wrapped in cable core in the middle of the power cable three-phase core, extrude the polyvinyl chloride oversheath at the outer surface of cable core.Describedly set gradually NTC metal oxide semi-conductive layer, corronil outer conductor and teflon insulation layer at copper inner wire outer surface, be the NTC material to be irritated with powder type into constitute NTC metal oxide semi-conductive layer between the copper inner wire and copper nickel outer conductor, on drawbench, be drawn into the temperature element core of certain diameter then, on the temperature element core that draws, extrude one deck teflon insulation layer again.Describedly setting gradually crosslinked polyetylene insulated layer, the wrapped metal screen layer of copper strips pressing twisted copper wires conductor outer surface, is to be that 1.0mm～3.0mm copper cash presses stranded section greater than 25mm through stranding machine with line diameter
2The round conductor outer surface on, extrude crosslinked polyetylene insulated layer with extruder, wrapped copper strips metal screen layer on crosslinked polyetylene insulated layer.
The design of power cables of the present invention and temperature element, when guaranteeing stranding, the size of temperature element and power cable can carry out concentric stranding well, the power cable manufacturing all must meet relative national standards, and its physical dimension only changes according to specification, can not make adjusted size, so the design of temperature element has just become key, bigger than normal as its design size, will push mutually between them during stranding and cause damage even, and guarantee to cooperate between them stable; On the other hand, if the temperature element physical dimension is less than normal, can cause that equally the instability between them cooperates, particularly sliding can appear in temperature element.
The material selection of temperature element and can, drawing process, different with the insulating barrier of general mineral insulated cable, adopt the NTC metal oxide between the temperature element internal and external conductor of the present invention, its performance is: in certain temperature range, the rising of material resistance and temperature is inversely proportional to, so just can transship at cable, when temperature raises, well conducting of the electric current that internal and external conductor produces.Generally speaking, the NTC material adapts in order to guarantee internal and external conductor and NTC working temperature in work that can both be stable below 300 ℃, select for use the T-shape thermocouple to make thermoelectric conductor, when local overheating appearred in cable, it can induce electromotive force, thereby reached the purpose of induction high temperature.After material was selected, its production technology had just become key technology, generally speaking, the same with mineral insulated cable production, can adopt the porcelain knob assembling, but because the NTC porcelain knob density of buying on the market is big especially, hardness is also big especially, be difficult to realize drawing, so, earlier the NTC porcelain knob is crushed into powder, carry out can again, control deviation is in 3% in can is produced, thereby satisfied designing requirement well.
Cable formula thermocouple temperature measurement power cable, electric power transfer is a major function, so the major part of this cable is the power cable part, in order to guarantee effective, the safe transmission of electric power, power cables is fully according to the respective country standard, comprising structure, sizes such as the conductor of cable, insulation, interior external shield, sheaths in strict accordance with the concerned countries standard production, but simultaneously, in order to guarantee that a temperature element can twist, the conductor of power cables adopts 25mm
2The above twisted copper wires round conductor that presses, and in order to guarantee the electromagnetic balance of cable cable phase conductor in running, we adopt concentric stranding, and on every phase conductor wrapped metal copper strips as screen, to prevent in the running electromagnetic interference to temperature element.
The temperature element warning function, because cable is in running, sometimes inevitably local overheating can appear, finally cause cable fault or loss of power transfer function, therefore, in time forecast is overheated just seems particularly important, in order to solve this technical problem, adopts thermocouple as temperature element.So-called thermocouple adopts thermoelectric effect to carry out thermometric temperature element exactly, as shown in Figure 4, the conductor A and the B of two kinds of different materials are concatenated into a closed-loop path, if the temperature difference of two junction points (T0 ≠ T), then between two conductors, produce thermoelectric potential, and a certain size electric current is arranged in the loop, this phenomenon is called thermoelectric effect.According to above-mentioned principle, we adopt copper to make inner wire, constantan is as outer conductor, constitute " T " thermocouple between it, simultaneously in order to guarantee that after temperature raises energy NTC metal oxide is as its coupling part between the internal and external conductor, the operation principle of NTC is: when temperature raises, its resistance reduces, and like this, just can guarantee the current delivery of induction point effectively.
The present invention is novel, and the selection science is rational in infrastructure, and production process is advanced simple, easy, and cost is low, and product uses good operation performance.Temperature element adopts copper to make inner wire, and corronil is made outer conductor, adopts NTC (negative temperature coefficient of resistance) metal oxide to make semi-conductive layer, measures temperature and reaches 300 ℃, and inner and outer conductor constitutes T type thermocouple.In certain temperature range, the rising of NTC material resistance and temperature is inversely proportional to, so just can transship at cable, and when temperature raises, well conducting of the electric current that internal and external conductor produces.Generally speaking, the NTC material adapts in order to guarantee internal and external conductor and NTC working temperature in work that can both be stable below 300 ℃, select for use the T-shape thermocouple to make thermoelectric conductor, when local overheating appearred in cable, it can induce electromotive force, thereby reached the purpose of induction high temperature.Temperature element is wrapped in that to carry out concentric type in the middle of the power cable stranded, helps cable temperature is carried out online detection, understands the variations in temperature of cable at any time, in time finds cable fault and reports to the police, and reminds the staff to safeguard, avoids accident to take place.
Description of drawings
Figure 1 shows that the structural representation of cable formula thermocouple temperature measurement power cable of the present invention;
Figure 2 shows that the structural representation of temperature element of the present invention;
Figure 3 shows that the process for making flow chart of cable formula thermocouple temperature measurement power cable of the present invention;
Figure 4 shows that the thermocouple principle schematic diagram of temperature element of the present invention;
Among the figure: 1 conductor, 2 internal shields, 3 insulating barriers, 4 outer shielding layers, 5 metal screen layers, 6 temperature elements, 7 oversheaths, 8 inner wires, 9 semi-conductive layers, 10 outer conductors, 11 sheaths, 12 wire drawings, 13 stranded, 14 (inner shields), insulation, (external shield) are extruded, 15 wrapped copper strips, 16 clean, oven dry, 17 assemblings, 18 drawings, 19 extrude polytetrafluoroethylene, 20 strandings, 21 extrude polyvinyl chloride.
Embodiment
One, cable formula thermocouple temperature measurement power cable constitutes temperature element 6 by copper inner wire 8, corronil outer conductor 10, NTC metal oxide semi-conductive layer 9 and teflon insulation sheath 11.Copper inner wire 8 is a wire, and corronil outer conductor 10 is a tubulose, and copper inner wire 8 strings are enclosed within the corronil outer conductor 10, and NTC metal oxide semi-conductive layer 9 is set between copper inner wire 8 and the corronil outer conductor 10.Extrude teflon insulation sheath 11 at corronil outer conductor 10 outer surfaces.At section is 25mm
2Circle press twisted copper wires conductor 1 outer surface and extrude crosslinked semiconductive internal shield 2, crosslinked polyetylene insulated layer 3 and crosslinked semiconductive outer shielding layer 4, the power cable that constitutes more than the 6kV at wrapped again copper strips metal screen layer 5 on the outer shielding layer 4.Only extrude the power cables that crosslinked polyetylene insulated layer 3 and wrapped copper strips metal screen layer 5 constitute below the 6kV pressing twisted copper wires conductor 1 outer surface.The middle concentric stranding that temperature element is wrapped in three above power cables of 6kV becomes cable core, extrudes the cable formula thermocouple temperature measurement power cable that polyvinyl chloride oversheath 7 constitutes the above grade of 6kV on cable core.The middle concentric stranding that temperature element is wrapped in three following power cables of 6kV becomes cable core, extrudes the cable formula thermocouple temperature measurement power cable that polyvinyl chloride oversheath 7 constitutes the following grade of 6kV on cable core.
Two, the process for making of cable formula thermocouple temperature measurement power cable
(1), power cable manufacturing
1, the copper bar that will anneal (general diameter is φ 8.0mm) carries out wire drawing, is drawn into the small dimension single line that filament diameter is 1.0mm～3.0mm through wire drawing machine, and the single line that draws is annealed;
2, be not less than 25mm according to general cross-sectional area of conductor
2Technological requirement, the line diameter after the selective annealing is some of φ 1.0mm～φ 3.0mm, it is stranded to adopt 54B (or 6B, 30B, 61B) stranding machine to press, making the cross section is 25mm
2Press twisted copper wires conductor 1.
3 make power cable, 6kV and above power cable, adopt three-layer co-extruded method, extrude crosslinked semiconductive internal shield 2, crosslinked polyetylene insulated layer 3, crosslinked semiconductive outer shielding layer 4, wrapped copper strips metal screen layer 5 on outer shielding layer 4 with three extruders on the twisted copper wires conductor 1 respectively pressing.6kV and following power cable, with extruder press extrude crosslinked polyetylene insulated layer 3 on the twisted copper wires conductor 1, wrapped copper strips metal screen layer 5 on crosslinked polyetylene insulated layer 3.
(2) temperature element manufacturing
With wire copper inner wire 8, tubulose corronil outer conductor 10, clean, dry 16 laggard luggages with weak acid or weak caustic solution and join 17, that is: copper inner wire 8 strings are enclosed within the corronil outer conductor 10, irritate pulverous NTC metal oxide semi-conductive layer 9 between copper inner wire 8 and corronil outer conductor 10.Then, on drawbench, carry out the element that intended diameter is made in drawing 18, on the element after the drawing, extrude polytetrafluoroethylene 19 insulation sheaths 11.
(3), stranding
Concentric type is twisted into cable core in the middle of a temperature element being wrapped in power cable three-phase core on cabler, extrudes polyvinyl chloride 21 oversheaths 7 at the cable core outer surface of stranded stranding 20, makes qualified cable formula thermocouple temperature measurement power cable.
The making of cable formula thermocouple temperature measurement power cable, relate to power cable and temperature element, combination size according to power cable, determine the maximum outside diameter of temperature element, and allow power cable carry out stranding around temperature element, like this, just can: (1) guarantees the electromagnetic balance between the phase core, occur certain phase conductor overload phenomenon when preventing the cable operation, and the electromagnetic interference that prevents temperature element can be arranged; (2) guarantee compact conformation, can not increase the outside diameter of cable, make what difference cable does not have from it seems in appearance with common power cable, help a joint consumption reduction; (3) effectively realized cable operation high temperature alarm, because temperature element and all power cables be in contact with one another, so can monitor each phase core ruuning situation of cable.
Cable formula thermocouple temperature measurement power cable adopts cable formula thermocouple to make temperature element, make cable have: (1) need not to add the detection power supply, because thermocouple is to utilize thermoelectric effect to carry out work, when one end temperature is higher than other parts, it can produce induced current automatically, only need induced current is received corresponding tester by compensating wire, just can observe the ruuning situation of cable by the electric current situation of change; (2) owing to adopt cable formula structure, the temperature variations of whole cable of continuous monitoring effectively, when whole cable temperature each point changes when different, can capture the variations in temperature maximum a bit; (3), just can accurately locate according to current difference between the two ends that capture if all receive at the two ends of cable.
The temperature element of cable formula thermocouple temperature measurement power cable, adopt NTC metal oxide semiconductive material, make cable formula thermocouple temperature measurement power cable become a kind of fire alarm transducer, cable has been possessed: 1) can design alarm temperature arbitrarily, in the working temperature that cable allows, can change alarm temperature arbitrarily, the cable applicability is strengthened; 2) can reuse by force,, come work, so after warning work once, Maintenance free can be reused but change according to the resistance temperature of semi-conductive layer because the cable operation principle is not fusing; 3) because NTC itself is a kind of temperature sensing material, so cable except can do fire alarm with, but the thermometric place of application need also increases the range of application of cable, make cable not only can be used as detector for fire alarm system and use, also can be used as temperature sensor and use.
For the recycling that guarantees that cable work can be real, adopt the polytetrafluoroethylene exotic material to do insulating barrier and sheath, its the highest long-term work temperature of polytetrafluoroethylene is 260 ℃, and do not burn, make cable have: 1) good flame retardancy has strengthened the useful life of cable under fire hazard environment; 2) good heat-resistant has improved working life and the stability of cable under long term high temperature.
Claims (9)
1, a kind of cable formula thermocouple temperature measurement power cable, comprise conductor, insulation, interior external shield and oversheath, it is characterized in that cable is provided with at the copper conductor outer surface sets gradually NTC metal oxide semi-conductive layer, the temperature element that corronil outer conductor and teflon insulation layer constitute and three set gradually crosslinked semiconductive internal shield pressing twisted copper wires conductor outer surface respectively, crosslinked polyetylene insulated layer, crosslinked semiconductive outer shielding layer, the power cable that the wrapped metal screen layer of copper strips constitutes, the temperature element parcel is stranded in the centre of power cable three-phase core, and the polyvinyl chloride oversheath is arranged on the outer surface of the cable core of temperature element and power cable formation.
2, cable formula thermocouple temperature measurement power cable according to claim 1 is characterized in that the described section that presses the twisted copper wires conductor is greater than 25mm
2Circular.
3, a kind of cable formula thermocouple temperature measurement power cable, comprise conductor, insulation, interior external shield and oversheath, it is characterized in that cable is provided with at the copper conductor outer surface sets gradually NTC metal oxide semi-conductive layer, the temperature element that corronil outer conductor and teflon insulation layer constitute and three set gradually crosslinked polyetylene insulated layer pressing twisted copper wires conductor outer surface respectively, the power cables that the wrapped metal screen layer of copper strips constitutes, the temperature element parcel is stranded in the centre of power cable three-phase core, and the polyvinyl chloride oversheath is arranged on the outer surface of the cable core of temperature element and power cable formation.
4, a kind of process for making of cable formula thermocouple temperature measurement power cable, it is characterized in that earlier prefabricated set gradually NTC metal oxide semi-conductive layer at copper inner wire outer surface, the temperature element that corronil outer conductor and teflon insulation layer constitute and set gradually crosslinked semiconductive internal shield pressing twisted copper wires conductor outer surface, crosslinked polyetylene insulated layer, crosslinked semiconductive outer shielding layer, the power cable that the wrapped metal screen layer of copper strips constitutes, on cabler, carry out concentric type and be twisted into a temperature element and be wrapped in cable core in the middle of three power cables, extrude the polyvinyl chloride oversheath at the outer surface of cable core.
5, the process for making of cable formula thermocouple temperature measurement power cable according to claim 4, it is characterized in that describedly setting gradually NTC metal oxide semi-conductive layer, corronil outer conductor and teflon insulation layer at copper inner wire outer surface, be the NTC material to be irritated with powder type into constitute NTC metal oxide semi-conductive layer between the copper inner wire and corronil outer conductor, on drawbench, be drawn into the temperature element core of certain diameter then, on the temperature element core that draws, extrude one deck teflon insulation layer again.
6, the process for making of cable formula thermocouple temperature measurement power cable according to claim 4, it is characterized in that describedly setting gradually crosslinked semiconductive internal shield, crosslinked polyetylene insulated layer, crosslinked semiconductive outer shielding layer, the wrapped metal screen layer of copper strips pressing twisted copper wires conductor outer surface, is to be that 1.0mm～3.0mm copper cash presses stranded section greater than 25mm through stranding machine with line diameter
2The round conductor outer surface on, extrude crosslinked semiconductive internal shield, crosslinked polyetylene insulated layer and crosslinked semiconductive outer shielding layer, wrapped copper strips metal screen layer on outer shielding layer simultaneously with three extruders.
7, a kind of process for making of cable formula thermocouple temperature measurement power cable, it is characterized in that setting gradually temperature element that NTC metal oxide semi-conductive layer, corronil outer conductor and teflon insulation layer constitute and setting gradually the power cable that crosslinked polyetylene insulated layer, the wrapped metal screen layer of copper strips constitute pressing twisted copper wires conductor outer surface at copper inner wire outer surface with earlier prefabricated, on cabler, carry out concentric type and be twisted into a temperature element and be wrapped in cable core in the middle of the power cable three-phase core, extrude the polyvinyl chloride oversheath at the outer surface of cable core.
8, the process for making of cable formula thermocouple temperature measurement power cable according to claim 7, it is characterized in that describedly setting gradually NTC metal oxide semi-conductive layer, corronil outer conductor and teflon insulation layer at copper inner wire outer surface, be the NTC material to be irritated with powder type into constitute NTC metal oxide semi-conductive layer between the copper inner wire and corronil outer conductor, on drawbench, be drawn into the temperature element core of certain diameter then, on the temperature element core that draws, extrude one deck teflon insulation layer again.
9, the process for making of cable formula thermocouple temperature measurement power cable according to claim 7, it is characterized in that describedly setting gradually crosslinked polyetylene insulated layer, the wrapped metal screen layer of copper strips pressing twisted copper wires conductor outer surface, is to be that 1.0mm～3.0mm copper cash presses stranded section greater than 20mm through stranding machine with line diameter
2The round conductor outer surface on, extrude crosslinked polyetylene insulated layer with extruder, wrapped copper strips metal screen layer on crosslinked polyetylene insulated layer.
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Effective date of registration: 20190709 Address after: 201308 No. 58 Feizhou Road, Nanhui New Town, Pudong New District, Shanghai Patentee after: Shanghai Anjie Fireproof Intelligent Cable Co., Ltd. Address before: 225800 No. 1 Su Zhong Road, Baoying County, Jiangsu Patentee before: Baosheng Science and Technology Innovation Co., Ltd. |
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