CN203443695U - Temperature measuring apparatus of cable conductor - Google Patents
Temperature measuring apparatus of cable conductor Download PDFInfo
- Publication number
- CN203443695U CN203443695U CN201320582465.3U CN201320582465U CN203443695U CN 203443695 U CN203443695 U CN 203443695U CN 201320582465 U CN201320582465 U CN 201320582465U CN 203443695 U CN203443695 U CN 203443695U
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- cable
- temperature sensor
- temperature
- cable conductor
- thermal resistor
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Abstract
Provided in the utility model is a temperature measuring apparatus of a cable conductor. The temperature measuring apparatus comprises a thermal resistance member arranged at the outer surface of the cable; an inner-layer temperature sensor contacted with the outer surface of the cable is arranged at the inner surface of the thermal resistance member; an outer-layer temperature sensor is arranged at the outer surface of the thermal resistance member; and the inner-layer temperature sensor and the outer-layer temperature sensor are arranged at the same radial straight line of the cable. With the temperature measuring apparatus, the cable conductor is heated and heat is dissipated towards the outer side by an insulated sheath; and the cable conductor tends to be in a thermal balance state. A corresponding temperature gradient is formed based on the thermal resistance distribution in the thermal resistance member and the insulated sheath; a temperature gradient value of the thermal resistance member is obtained according to the measurement values of the inner-layer temperature sensor and the outer-layer temperature sensor; and the temperature of the cable conductor is calculated by utilizing a cable thermal balance mathematical model. Therefore, the measurement accuracy of the cable temperature is improved; and the secure running of the cable is ensured.
Description
Technical field
The utility model relates to a kind of temperature measurement equipment, particularly relates to a kind of temperature measurement of cable conductor device.
Background technology
It is the lifeblood of guaranteeing national economy life that the electric power of high-tension cable is carried, and how on the basis that guarantees cable running safety, making good use of to greatest extent high-tension cable, to carry electric current electric weight and electric current to optimize transportation scheme be the problem that electric administrative department is paid close attention at present.The actual load ability of cable mainly reflects by the temperature of cable conductor, needs only cable conductor temperature and is no more than specified temperature, and the load of cable is just in safe load scope.At present, solving current-carrying capacity of cable monitoring effective way is on-line monitoring cable conductor temperature.
High-tension cable comprises the insulating sheath 2 of cable conductor 1 and coated cable conductor 1, and as shown in Figure 1, so the temperature of cable conductor 1 can not directly be measured.General employing optical fiber distributed type temp measuring system is monitored the surface temperature of insulating sheath 2 at present, and then applied mathematical model is calculated the temperature of cable conductor 1, and then calculates the actual loading rate of cable line.But, the epidermis of insulating sheath 2 is not a fixing difference to the temperature difference between cable conductor 1, and in practical application, the surface temperature of insulating sheath 2 is influenced by ambient temperature, it changes greatly, and environment temperature is the temperature field of a random variation, so only calculate that by measuring the surface temperature of insulating sheath 2 temperature of cable conductor 1 can cause measuring inaccurate situation; And the temperature accuracy of optical fiber distributed type temp measuring system, 1～2 ℃ of left and right, even environment temperature is revised, can not meet actual measurement requirement substantially.
Utility model content
The shortcoming of prior art in view of the above, the temperature measurement of cable conductor device that provides a kind of measuring accuracy high is provided the purpose of this utility model.
For achieving the above object, the utility model provides a kind of temperature measurement of cable conductor device, comprise the thermal resistor being coated on cable outside surface, the inside surface of described thermal resistor is provided with an internal layer temperature sensor contacting with cable outside surface, the outside surface of described thermal resistor is provided with an exospheric temperature sensor, and described internal layer temperature sensor and exospheric temperature sensor are positioned in the same radial alignment of cable.
Further, the outside surface of described exospheric temperature sensor is coated with a thermal insulation barriers.
Preferably, the xsect of described thermal resistor is one fan-shaped, and the angle [alpha] of the coated cable of thermal resistor is 0～180 °.
Preferably, described thermal resistor is bonded in the outside surface of cable by heat conductive silica gel.
Further, described thermal resistor is banded in cable outside surface.
As mentioned above, the temperature measurement of cable conductor device that the utility model relates to, has following beneficial effect:
In this temperature measurement of cable conductor device, cable conductor heating in cable, insulating sheath by cable dispels the heat laterally, and trend towards thermal equilibrium state, in thermal resistor and insulating sheath, according to the distribution of thermal resistance, form corresponding thermograde, by the measured value of internal layer temperature sensor and exospheric temperature sensor, obtain again the thermograde numerical value of thermal resistor, utilize cable thermal equilibrium mathematics model to calculate the temperature of cable conductor, thereby improve the measurement accuracy of cable temperature, guarantee the safe operation of cable.
Accompanying drawing explanation
Fig. 1 is the structural representation of cable.
Fig. 2 is structural representation of the present utility model.
Fig. 3 is that the A-A of Fig. 2 is to cut-open view.
Element numbers explanation
1 cable conductor
2 insulating sheaths
3 thermal resistors
4 internal layer temperature sensors
5 exospheric temperature sensors
6 thermal insulation barriers
Embodiment
By particular specific embodiment, embodiment of the present utility model is described below, person skilled in the art scholar can understand other advantages of the present utility model and effect easily by the disclosed content of this instructions.
Notice, appended graphic the illustrated structure of this instructions, ratio, size etc., equal contents in order to coordinate instructions to disclose only, for person skilled in the art scholar, understand and read, not in order to limit the enforceable qualifications of the utility model, therefore the technical essential meaning of tool not, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under the effect that the utility model can produce and the object that can reach, all should still drop on the technology contents that the utility model discloses and obtain in the scope that can contain.Simultaneously, in this instructions, quote as " on ", the term of D score, " left side ", " right side ", " centre " and " " etc., also only for ease of understanding of narrating, but not in order to limit the enforceable scope of the utility model, the change of its relativeness or adjustment, under without essence change technology contents, when being also considered as the enforceable category of the utility model.
As shown in Figures 2 and 3, the utility model provides a kind of temperature measurement of cable conductor device, comprise the thermal resistor 3 being coated on cable outside surface, the inside surface of described thermal resistor 3 is provided with an internal layer temperature sensor 4 contacting with cable outside surface, the outside surface of described thermal resistor 3 is provided with an exospheric temperature sensor 5, and described internal layer temperature sensor 4 and exospheric temperature sensor 5 are positioned in the same radial alignment of cable; Described cable comprises cable conductor 1 and is coated on the insulating sheath 2 of cable conductor 1 periphery, described thermal resistor 3 is fixed on the outside surface of insulating sheath 2, be that internal layer temperature sensor 4 is between insulating sheath 2 and thermal resistor 3, in the present embodiment, described internal layer temperature sensor 4 and exospheric temperature sensor 5 are all embedded in thermal resistor 3.
The thermal resistance of cable is one of its fixing physical attribute, and the thermal resistance value of cable can obtain by modes such as calibration measurements, and the mode that also can calculate by theory is extrapolated.Under thermal equilibrium state, i.e. heat radiation equals adstante febre, and the ratio of the thermal resistance value between any two points equates with the ratio of the temperature difference between these 2.So, in the temperature measurement of cable conductor device that the utility model relates to, the thermal resistance value of described thermal resistor 3 is known, the hull-skin temperature T2 and the internal surface temperature T1(T1 that by exospheric temperature sensor 5 and internal layer temperature sensor 4, measure respectively thermal resistor 3 are also the surface temperature of cable), can obtain the temperature difference between inside and outside 2 of thermal resistor 3, then to the corresponding relation between the thermal resistance value of cable conductor 1, calculate the temperature of cable conductor 1 according to the thermal resistance value of thermal resistor 3 and insulating sheath 2 extexines.That is to say, by the measured value of exospheric temperature sensor 5 and internal layer temperature sensor 4, obtain being positioned at the thermal resistor 3 extra thermograde that forms of cable outside, according to this extra thermograde relation corresponding with the thermograde of cable inside, calculate the temperature gradient curve (that is: slope) of cable inside, set up the thermograde of cable conductor 1, cable surface (thermal resistor 3 inside surfaces), thermal resistor 3 outside surfaces, then by setting up the temperature of finite element model Accurate Estimation cable conductor 1.
In actual measurement, after this measurement mechanism is arranged on cable, the load of cable can change, and the variation of cable load can cause that cable conductor 1 thermal value changes; When thermal value changes, cable inside reaches thermal equilibrium state again by changing the distribution of thermograde, and generally this thermal equilibrium process need is about 10 hours.In order to measure in time the temperature of cable conductor 1, so employing dynamic measurement method, in the process forming in thermal equilibrium, the inside and outside both sides of thermal resistor 3 are in the situation that dispelling the heat and heating occurs difference, because internal layer temperature sensor 4 is not identical apart from the distance of cable conductor 1 with exospheric temperature sensor 5, so the speed of internal layer temperature sensor 4 induction cable conductor 1 temperature variation is fast, the speed of exospheric temperature sensor 5 induction cable conductor 1 temperature variation is slow.The pace of change of the response speed of internal layer temperature sensor 4 and exospheric temperature sensor 5 and cable conductor 1 temperature has corresponding relation, therefore utilize internal layer temperature sensor 4 response speed different with exospheric temperature sensor 5, by the mode of demarcating or theory is derived, cable conductor 1 temperature in thermal equilibrium process is revised, the data based on static are derived and are calculated dynamic cable conductor 1 temperature, further improve measuring accuracy.
In the present embodiment, the basic calculating formula of the temperature of cable conductor 1 is:
In formula: T is the temperature of tested cable conductor 1; T
1for the measured value of internal layer temperature sensor 4, the internal layer temperature of cable skin temperature or thermal resistor 3 namely; T
2for the measured value of exospheric temperature sensor 5, the exospheric temperature of thermal resistor 3 namely;
for the first order derivative of cable skin temperature to the time;
for the exospheric temperature of thermal resistor 3 first order derivative to the time; k
1for static coefficient; k
2for performance coeffcient.
Further, the outside surface of described exospheric temperature sensor 5 is coated with a thermal insulation barriers 6, described thermal insulation barriers 6 is by exospheric temperature sensor 5 and environment temperature isolation, effectively avoid environment temperature rapid fluctuations to change the interference to outer temperature sensor 5, and thermal insulation barriers 6 can also the temperature shock of buffer environment temperature to outer temperature sensor 5, the impact that makes measurement data not changed by environment temperature rapid fluctuations, finally improves measuring accuracy.In the present embodiment, thermal insulation barriers 6 is attached to the outside surface of thermal resistor 3 in bonding mode, and exospheric temperature sensor 5 is sealed between thermal resistor 3 and thermal insulation barriers 6, the heat-barrier material of described thermal insulation barriers 6 can be: silicane rubber plate, teflon, silicon rubber etc.
Preferably, described thermal resistor 3 is bonded in the outside surface of the insulating sheath 2 of cable by heat conductive silica gel, also can directly be banded on cable skin, the thermal resistance material of described thermal resistor 3 can be: teflon, silicon rubber foamed board, teflon cystosepiment, silicane rubber plate, silica wool, quartz fabric etc.
Preferably, described cable is cylindrical, and the xsect that is coated on the thermal resistor 3 of cable skin is one fan-shaped, sees Fig. 3, and the angle [alpha] of thermal resistor 3 coated cables is 0～180 °; Preferably, the girth of described thermal resistor 3 can for cable girth 1/2,1/3 or less.Certainly, the xsect of described thermal resistor 3 can be also square or other shapes, to adapt to difform cable.
In sum, this temperature measurement of cable conductor device adopts temperature gradient method thermometric, and the resolution of internal layer temperature sensor 4 and exospheric temperature sensor 5 is 0.001 ℃, relative accuracy is up to 0.01 ℃, and then greatly improve the thermometric degree of accuracy of cable conductor 1, and this apparatus structure is simple, cost is low, thereby be suitable for applying.So the utility model has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any person skilled in the art scholar all can, under spirit of the present utility model and category, modify or change above-described embodiment.Therefore, have in technical field under such as and conventionally know that the knowledgeable modifies or changes not departing from all equivalences that complete under spirit that the utility model discloses and technological thought, must be contained by claim of the present utility model.
Claims (5)
1. a temperature measurement of cable conductor device, it is characterized in that: comprise the thermal resistor (3) being coated on cable outside surface, the inside surface of described thermal resistor (3) is provided with an internal layer temperature sensor (4) contacting with cable outside surface, the outside surface of described thermal resistor (3) is provided with an exospheric temperature sensor (5), and described internal layer temperature sensor (4) and exospheric temperature sensor (5) are positioned in the same radial alignment of cable.
2. temperature measurement of cable conductor device according to claim 1, is characterized in that: the outside surface of described exospheric temperature sensor (5) is coated with a thermal insulation barriers (6).
3. temperature measurement of cable conductor device according to claim 1, is characterized in that: the xsect of described thermal resistor (3) is one fan-shaped, and the angle [alpha] of the coated cable of thermal resistor (3) is 0～180 °.
4. temperature measurement of cable conductor device according to claim 1, is characterized in that: described thermal resistor (3) is bonded in the outside surface of cable by heat conductive silica gel.
5. temperature measurement of cable conductor device according to claim 1, is characterized in that: described thermal resistor (3) is banded in cable outside surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320582465.3U CN203443695U (en) | 2013-09-18 | 2013-09-18 | Temperature measuring apparatus of cable conductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320582465.3U CN203443695U (en) | 2013-09-18 | 2013-09-18 | Temperature measuring apparatus of cable conductor |
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| Publication Number | Publication Date |
|---|---|
| CN203443695U true CN203443695U (en) | 2014-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320582465.3U Expired - Lifetime CN203443695U (en) | 2013-09-18 | 2013-09-18 | Temperature measuring apparatus of cable conductor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458037A (en) * | 2013-09-18 | 2015-03-25 | 上海电缆研究所 | Cable conductor temperature measuring device and method |
| CN109549635A (en) * | 2018-11-08 | 2019-04-02 | 湖南仪峰安安网络科技股份有限公司 | Body temperature on-line dynamic measurement method and wearable device |
| CN111579106A (en) * | 2020-05-06 | 2020-08-25 | 深圳供电局有限公司 | Cable on-line monitoring device and system |
-
2013
- 2013-09-18 CN CN201320582465.3U patent/CN203443695U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458037A (en) * | 2013-09-18 | 2015-03-25 | 上海电缆研究所 | Cable conductor temperature measuring device and method |
| CN104458037B (en) * | 2013-09-18 | 2017-09-01 | 上海电缆研究所有限公司 | Temperature measurement of cable conductor device and its measuring method |
| CN109549635A (en) * | 2018-11-08 | 2019-04-02 | 湖南仪峰安安网络科技股份有限公司 | Body temperature on-line dynamic measurement method and wearable device |
| CN111579106A (en) * | 2020-05-06 | 2020-08-25 | 深圳供电局有限公司 | Cable on-line monitoring device and system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 200093 No. 1000, military road, Shanghai, Yangpu District Patentee after: SHANGHAI ELECTRIC CABLE RESEARCH INSTITUTE Co.,Ltd. Patentee after: Shanghai Saikeli Photoelectric Technology Co.,Ltd. Patentee after: SHANGHAI SENSORLEAD TECHNOLOGY Co.,Ltd. Address before: 200093 No. 1000, military road, Shanghai, Yangpu District Patentee before: SHANGHAI ELECTRIC CABLE Research Institute Patentee before: SHANGHAI SECRI OPTICAL&ELECTRIC CABLE Co.,Ltd. Patentee before: SHANGHAI SENSORLEAD TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140219 |
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| CX01 | Expiry of patent term |