CN2720578Y - Cable-type thermocouple temp.-measuring electric power cable - Google Patents
Cable-type thermocouple temp.-measuring electric power cable Download PDFInfo
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- CN2720578Y CN2720578Y CN 200420079111 CN200420079111U CN2720578Y CN 2720578 Y CN2720578 Y CN 2720578Y CN 200420079111 CN200420079111 CN 200420079111 CN 200420079111 U CN200420079111 U CN 200420079111U CN 2720578 Y CN2720578 Y CN 2720578Y
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- power cable
- temperature element
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Abstract
The utility model relates to a cable-type thermocouple temp.-measuring electric power cable, belonging to the technical field of the cable. The cable is provided with a temperature measurement element comprising a metallic oxide semi-conducting coating, a colomony outer conductor and a polytetrafluoroethylene insulation layer which are arrnanged in sequence on the outer surface of a copper inner conductor, and three power cables comprising a crosslinked semiconductor inner shielding layer, a crosslinked polyethylene insulation layer, a crosslinked semiconductor outer shielding layer, copper strip winding coating shielding layer which are respectively on the outer surface of a pressing twist copper wire conductor. The temperature measurement element is coated and twisted in the middle of the triple line core of three power cables. The utility model has reasonable and simple structure, easy production and manufacture, low cost and favorable operation performance. The temperature measurement element can achieve the purpose of the inductive high-temperature when the cable excesses the load and the temperature rises. The utility model is propitious to make the on-line detection for the cable temperature, and the user can make awareness of the temperature change of the cable at any moment, discover the cable fault and make an alarm in time, remind the work staff to make maintenance, and avoid the occurrence of failure. The utility model has very favorable popularization and application value.
Description
Technical field
The utility model relates to a kind of structure that can make things convenient for the power cable of thermometric, belongs 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.
The utility model content
The purpose of this utility model 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 of cable fault.
The purpose of this utility model is 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, temperature element is wrapped and 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 20mm
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 copper nickel 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, temperature element is wrapped and 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 design of power cables of the present utility model and temperature element, in the time of must 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, its physical dimension only changes according to specification, can not make adjusted size, so the design of temperature element has just become key problem in technology, on the one hand, bigger than normal as its design size, will push mutually between them during stranding and cause damage even, and can't 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 powder can, drawing production technology, 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 after the assembling, 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 its 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 cable should be fully according to the respective country standard production, 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 cable 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 utility model is novel, and the selection science is rational in infrastructure simple, manufactures easily, 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.It is stranded that temperature element is wrapped in the middle concentric type that carries out of power cable three-phase core, help cable temperature is carried out online detection, understand the variations in temperature of cable at any time, in time find cable fault and report to the police, remind the staff to safeguard, avoid 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 utility model;
Figure 2 shows that the structural representation of temperature element of the present utility model;
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, 9NTC semi-conductive layer, 10 outer conductors, 11 sheaths.
Embodiment
Constitute temperature element 6 by copper inner wire 8, copper nickel 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 string is enclosed within the corronil outer conductor 10, between copper inner wire 8 and copper nickel outer conductor 10 are interior NTC metal oxide semi-conductive layer 9 is set.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 cable 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 the temperature element parcel is stranded 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 the temperature element parcel is stranded in the three following power cable three-phase of 6kV cores 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.
The making of cable formula thermocouple temperature measurement power cable, relate to power cables and temperature element, combination size according to power cables, determine the maximum outside diameter of temperature element, and allow power cables 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 can effectively prevent electromagnetic interference temperature element; (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 when operation high temperature alarm, because temperature element and all power cables be in contact with one another, so can monitor the whole every phase core of cable ruuning situation.
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 (3)
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, temperature element is wrapped and 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 cables 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 20mm
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 cable that the wrapped metal screen layer of copper strips constitutes, temperature element is wrapped and 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420079111 CN2720578Y (en) | 2004-08-25 | 2004-08-25 | Cable-type thermocouple temp.-measuring electric power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420079111 CN2720578Y (en) | 2004-08-25 | 2004-08-25 | Cable-type thermocouple temp.-measuring electric power cable |
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| Publication Number | Publication Date |
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| CN2720578Y true CN2720578Y (en) | 2005-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420079111 Expired - Lifetime CN2720578Y (en) | 2004-08-25 | 2004-08-25 | Cable-type thermocouple temp.-measuring electric power cable |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007053991A1 (en) * | 2005-11-14 | 2007-05-18 | Gangjin Li | Analog linetype constant temp fire detecting cable |
| CN100411061C (en) * | 2006-06-20 | 2008-08-13 | 广州凯恒特种电线电缆有限公司 | Radiation crosslinking modified ethylene-tetrafluoroethylene insulated wire cable |
| CN100498981C (en) * | 2004-08-25 | 2009-06-10 | 宝胜科技创新股份有限公司 | Cable-type thermocouple temp-measuring power cable and manufacturing processing method thereof |
| CN101776490A (en) * | 2010-03-12 | 2010-07-14 | 蒋陆肆 | Method for real-timely monitoring cable working temperature |
| CN102005265A (en) * | 2010-12-21 | 2011-04-06 | 河北晶辉电工有限公司 | Power cable capable of easily detecting fault position |
| CN102494793A (en) * | 2011-12-01 | 2012-06-13 | 国网电力科学研究院 | Temperature thermocouple for high-voltage and ultrahigh-voltage power cable |
| CN102842380A (en) * | 2012-08-23 | 2012-12-26 | 江苏超能电缆有限公司 | Temperature-control monitoring power cable |
| CN103135635A (en) * | 2013-03-04 | 2013-06-05 | 上海理工大学 | Current control temperature method based on global position system (GPS) space-time compensation |
| CN109975353A (en) * | 2019-04-08 | 2019-07-05 | 中国科学技术大学 | A kind of high voltage power cable core heating control and internal and external temperature field coupling evolution mechanism study platform |
| CN112629695A (en) * | 2020-12-02 | 2021-04-09 | 深圳供电局有限公司 | Superconducting cable temperature monitoring system and monitoring method thereof |
-
2004
- 2004-08-25 CN CN 200420079111 patent/CN2720578Y/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100498981C (en) * | 2004-08-25 | 2009-06-10 | 宝胜科技创新股份有限公司 | Cable-type thermocouple temp-measuring power cable and manufacturing processing method thereof |
| WO2007053991A1 (en) * | 2005-11-14 | 2007-05-18 | Gangjin Li | Analog linetype constant temp fire detecting cable |
| CN100411061C (en) * | 2006-06-20 | 2008-08-13 | 广州凯恒特种电线电缆有限公司 | Radiation crosslinking modified ethylene-tetrafluoroethylene insulated wire cable |
| CN101776490A (en) * | 2010-03-12 | 2010-07-14 | 蒋陆肆 | Method for real-timely monitoring cable working temperature |
| CN102005265A (en) * | 2010-12-21 | 2011-04-06 | 河北晶辉电工有限公司 | Power cable capable of easily detecting fault position |
| CN102005265B (en) * | 2010-12-21 | 2012-07-04 | 河北晶辉电工有限公司 | Power cable capable of easily detecting fault position |
| CN102494793A (en) * | 2011-12-01 | 2012-06-13 | 国网电力科学研究院 | Temperature thermocouple for high-voltage and ultrahigh-voltage power cable |
| CN102842380A (en) * | 2012-08-23 | 2012-12-26 | 江苏超能电缆有限公司 | Temperature-control monitoring power cable |
| CN103135635A (en) * | 2013-03-04 | 2013-06-05 | 上海理工大学 | Current control temperature method based on global position system (GPS) space-time compensation |
| CN109975353A (en) * | 2019-04-08 | 2019-07-05 | 中国科学技术大学 | A kind of high voltage power cable core heating control and internal and external temperature field coupling evolution mechanism study platform |
| CN112629695A (en) * | 2020-12-02 | 2021-04-09 | 深圳供电局有限公司 | Superconducting cable temperature monitoring system and monitoring method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20090610 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |