CN104616806A - Low-thermal electromotive force cable - Google Patents
Low-thermal electromotive force cable Download PDFInfo
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- CN104616806A CN104616806A CN201510017327.4A CN201510017327A CN104616806A CN 104616806 A CN104616806 A CN 104616806A CN 201510017327 A CN201510017327 A CN 201510017327A CN 104616806 A CN104616806 A CN 104616806A
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- electromotive force
- low
- protective layer
- force cable
- copper
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Abstract
The invention discloses a low-thermal electromotive force cable. The low-thermal electromotive force cable is characterized by comprising a metal transmission wire core, a first protective layer sleeving the metal transmission wire core, a shielding layer sleeving the first protective layer, a second protective layer sleeving the shielding layer, and a copper bushing sleeving the second protective layer. According to the technical scheme, the low-thermal electromotive force cable uses the pure copper or pure silver metal transmission wire core; the multi-layer metal transmission wire core-first protective layer-shielding layer-second protective layer-copper bushing structure is good for lowering the influences of the thermal electromotive force on high-precision direct current voltage, the thermal electromotive force influence can be lowered to 10 to the power of -7 to 10 to the power of -8 from 10 to the power of -6, and the precise direct current voltage measurement precision can be improved.
Description
Technical field
The present invention relates to cable.More specifically, a kind of low-heat electromotive force cable is related to.
Background technology
Direct voltage is the basic parameter in electromagnetism metering, and many electrical quantities are derived by it and drawn, direct voltage unit volt is also closely related with the reproduction of international system of units, and therefore direct voltage metering has consequence in electromagnetism metering.The measurement of direct voltage parameter is widely used in all trades and professions such as Aeronautics and Astronautics, boats and ships, and in common DC voltage measurement, not high owing to measuring grade, the measure error that the drift of thermo emf that cable causes causes is negligible, but 10
-8high accuracy DC voltage measurement process in, drift thermoelectric potential impact just can not omit.Common cable is connected on digital voltmeter, and the drift thermoelectric potential of introducing may reach 10
-6even larger, its error caused will have a strong impact on the uncertainty of high accuracy DC voltage measurement.Such as, common cable generally adopts the material such as brass, copper-manganese, and when this kind of cable uses in high accuracy voltage measurement process, thermoelectric potential has a strong impact on measurement result.Other cables gold-plated on brass material, although the thermoelectric potential caused decreases, but can not meet the measurement requirement of high accuracy direct voltage.
Therefore, need to provide a kind of low-heat electromotive force cable.
Summary of the invention
The object of the present invention is to provide a kind of low-heat electromotive force cable.
For achieving the above object, the present invention adopts following technical proposals:
A kind of low-heat electromotive force cable, this low-heat potential lines cable wrap is drawn together: metallic transmission core, be coated at metallic transmission core the first protective layer, be coated at the first protective layer screen, be coated at the second protective layer of screen and be coated at the copper sleeve pipe of the second protective layer.
2, low-heat electromotive force cable according to claim 1, is characterized in that, the metallic transmission core in described low-heat electromotive force cable adopts fine copper or fine silver material makes and its diameter is greater than 0.7mm.
3, low-heat electromotive force cable according to claim 1, is characterized in that, described first protective layer adopts polytetrafluoroethylmaterial material to make.
Preferably, screen adopts braiding copper mesh to make.
Preferably, the second protective layer adopts the material identical with the first protective layer to make.
Preferably, copper sleeve pipe adopts pure copper material pipe, and its interior diameter is 10mm to 18mm, and its thickness is greater than 2mm.
Preferably, copper casing length is not less than 4/5 of metallic transmission core length.
Beneficial effect of the present invention is as follows:
Technical scheme of the present invention have employed the metallic transmission core of fine copper or fine silver material; the sandwich construction of metallic transmission core the-the first protective layer-screen-the second protective layer-copper sleeve pipe; be conducive to reducing thermoelectric potential to the impact of high accuracy direct voltage, can by thermoelectric potential influence from 10
-6magnitude is reduced to 10
-7~ 10
-8magnitude, can improve the accuracy of precision DC voltage measurement.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 illustrates precision DC voltage measuring apparatus structure chart.
Fig. 2 illustrates low-heat potential lines cable structure figure.
Embodiment
In order to be illustrated more clearly in the present invention, below in conjunction with preferred embodiments and drawings, the present invention is described further.Parts similar in accompanying drawing represent with identical Reference numeral.It will be appreciated by those skilled in the art that specifically described content is illustrative and nonrestrictive, should not limit the scope of the invention with this below.
As shown in Figure 1, the low-heat electromotive force cable that provides of the present embodiment for accuracy of measurement up to 10
-7~ 10
-8the precision DC voltage of magnitude.Precision DC voltage measuring apparatus comprises: precision DC voltage output device 1, reversing switch 2, digital voltmeter 3, precision DC voltage output device 1 exports precision DC voltage to reversing switch 2 by low-heat electromotive force cable 4, precision DC voltage is sent to digital voltmeter 3 by low-heat electromotive force cable 4 by reversing switch 2, the direct voltage exported by digital voltmeter 3 precise engineering surveying direct voltage output device 1.
The connected mode of precision DC voltage measuring apparatus is:
The voltage output end of precision DC voltage output device 1 connects the voltage input end of reversing switch 2, and connection cable adopts low-heat electromotive force cable;
The voltage output end of reversing switch 2 connects the voltage input end of digital voltmeter 3, and connection cable adopts and the voltage output end of precision DC voltage output device 1 is connected to the identical low-heat electromotive force cable of the voltage input end of reversing switch 2.
As shown in Figure 2, for the low-heat electromotive force cable of precision DC voltage measuring apparatus, five-layer structure is comprised: metallic transmission core 5, first protective layer 6, screen 7, second protective layer 8, copper sleeve pipe 9.
Metallic transmission core 5 adopts fine copper or fine silver material, is different from the Cu alloy material that common cable is used, and its diameter is greater than 0.7mm.The outside of metallic transmission core 5 is that the first protective layer 6, first protective layer 6 is used for isolating metallic transmission core 5 and screen 7, and the first protective layer 6 adopts polytetrafluoroethylmaterial material.First protective layer 6 outside is screen 7, and screen 7 is used for realizing the function of shielding of signal, adopts braiding copper mesh to make.Second protective layer 8 is outside at screen 7, and for the protection of screen 7, the material that the second protective layer 8 adopts is identical with the first protective layer 6.Second protective layer 8 outside is copper sleeve pipe 9, and copper sleeve pipe 9 length is not less than 4/5 of metallic transmission core 5 length, and adopt pure copper material pipe, interior diameter 10mm ~ 18mm, thickness is greater than 2mm.Outermost copper sleeve pipe 9 quality of cable is comparatively hard, can not bend, and therefore makes curvature or knuckle according to cable closure, realizes curved shape when cable is actual to be connected.
In sum; the technical scheme that the present embodiment provides have employed the metallic transmission core of fine copper or fine silver material; the sandwich construction of metallic transmission core the-the first protective layer-screen-the second protective layer-copper sleeve pipe; be conducive to reducing thermoelectric potential to the impact of high accuracy direct voltage, can by thermoelectric potential influence from 10
-6magnitude is reduced to 10
-7~ 10
-8magnitude, can improve the accuracy of precision DC voltage measurement.
Obviously; the above embodiment of the present invention is only for example of the present invention is clearly described; and be not the restriction to embodiments of the present invention; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot give exhaustive to all execution modes, every belong to technical scheme of the present invention the apparent change of extending out or variation be still in the row of protection scope of the present invention.
Claims (7)
1. a low-heat electromotive force cable; it is characterized in that, this low-heat potential lines cable wrap is drawn together: metallic transmission core, be coated at metallic transmission core the first protective layer, be coated at the first protective layer screen, be coated at the second protective layer of screen and be coated at the copper sleeve pipe of the second protective layer.
2. low-heat electromotive force cable according to claim 1, is characterized in that, the metallic transmission core in described low-heat electromotive force cable adopts fine copper or fine silver material makes and its diameter is greater than 0.7mm.
3. low-heat electromotive force cable according to claim 1, is characterized in that, described first protective layer adopts polytetrafluoroethylmaterial material to make.
4. low-heat electromotive force cable according to claim 1, is characterized in that, described screen adopts braiding copper mesh to make.
5. low-heat electromotive force cable according to claim 1, is characterized in that, described second protective layer adopts the material identical with the first protective layer to make.
6. low-heat electromotive force cable according to claim 1, is characterized in that, described copper sleeve pipe adopts pure copper material pipe, and its interior diameter is 10mm to 18mm, and its thickness is greater than 2mm.
7. low-heat electromotive force cable according to claim 1, is characterized in that, described copper casing length is not less than 4/5 of metallic transmission core length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510017327.4A CN104616806A (en) | 2014-12-30 | 2015-01-13 | Low-thermal electromotive force cable |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2014108405152 | 2014-12-30 | ||
| CN201410840515 | 2014-12-30 | ||
| CN201510017327.4A CN104616806A (en) | 2014-12-30 | 2015-01-13 | Low-thermal electromotive force cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104616806A true CN104616806A (en) | 2015-05-13 |
Family
ID=53151221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510017327.4A Pending CN104616806A (en) | 2014-12-30 | 2015-01-13 | Low-thermal electromotive force cable |
Country Status (1)
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| CN (1) | CN104616806A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB461371A (en) * | 1934-11-16 | 1937-02-16 | Okonite Co | Improvements in electric cables and electric cable systems |
| CN101556845A (en) * | 2009-04-17 | 2009-10-14 | 珠海宇讯同轴电缆有限公司 | Coaxial-cable with shielding structure |
| CN102305807A (en) * | 2011-05-25 | 2012-01-04 | 清华大学 | Method for measuring Seebeck coefficient of micro/nano thermoelectric materials or devices |
| CN102792388A (en) * | 2010-02-05 | 2012-11-21 | 矢崎总业株式会社 | Wire harness |
| CN103198603A (en) * | 2013-03-27 | 2013-07-10 | 李萍 | Temperature variation alarm line of coaxial structure |
| CN203521570U (en) * | 2013-10-29 | 2014-04-02 | 北京无线电计量测试研究所 | Heat insulation transmission line for coaxial N-type radio frequency calorimeter |
-
2015
- 2015-01-13 CN CN201510017327.4A patent/CN104616806A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB461371A (en) * | 1934-11-16 | 1937-02-16 | Okonite Co | Improvements in electric cables and electric cable systems |
| CN101556845A (en) * | 2009-04-17 | 2009-10-14 | 珠海宇讯同轴电缆有限公司 | Coaxial-cable with shielding structure |
| CN102792388A (en) * | 2010-02-05 | 2012-11-21 | 矢崎总业株式会社 | Wire harness |
| CN102305807A (en) * | 2011-05-25 | 2012-01-04 | 清华大学 | Method for measuring Seebeck coefficient of micro/nano thermoelectric materials or devices |
| CN103198603A (en) * | 2013-03-27 | 2013-07-10 | 李萍 | Temperature variation alarm line of coaxial structure |
| CN203521570U (en) * | 2013-10-29 | 2014-04-02 | 北京无线电计量测试研究所 | Heat insulation transmission line for coaxial N-type radio frequency calorimeter |
Non-Patent Citations (3)
| Title |
|---|
| 胡毅飞等: ""直流数字纳伏表校准装置研究"", 《计量学报》 * |
| 钟国林等: ""直流电压自然基准装置的研究及量值复现"", 《中国测试技术》 * |
| 高原等: ""10V约瑟夫森结阵电压基准"", 《现代计量测试》 * |
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| PB01 | Publication | ||
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Application publication date: 20150513 |