CN101315817A - Gas insulation electric power line - Google Patents
Gas insulation electric power line Download PDFInfo
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- CN101315817A CN101315817A CNA2008100406467A CN200810040646A CN101315817A CN 101315817 A CN101315817 A CN 101315817A CN A2008100406467 A CNA2008100406467 A CN A2008100406467A CN 200810040646 A CN200810040646 A CN 200810040646A CN 101315817 A CN101315817 A CN 101315817A
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Abstract
The invention provides a gas insulation transmission line, which comprises a shell and an inner conductor coaxial with the shell. The space between the shell and the inner conductor is filled with an insulating gas which is compressed air after being dried and purified. The pressure of the compressed air is 1.5Mpa to 2.5Mpa, the dust granularity thereof is smaller than or equal to 0.1Mum, oil content thereof is smaller than or equal to 0.01mg/m<3>, and the moisture content thereof is smaller than or equal to a condensation point of -70 DEG C. By adopting the compressed air after being dried and purified to substitute the insulating gas mainly containing SF6 in the conventional gas insulation transmission line, the gas insulation transmission line of the invention can not only play the role of insulation of the insulating gas in the conventional gas insulation transmission line, and simultaneously can enhance the environmental protection of the gas insulation transmission line.
Description
Technical field
The present invention relates to high voltage power transmission transmission equipment field, relate in particular to a kind of gas insulation electric power line.
Background technology
Gas insulation electric power line is the pipe sealing structure, and mounting means is comparatively flexible, can be divided into: directly buried installation, open air are set up with the tunnel and are installed.The early stage purpose of using gas insulation electric power line is to realize that the underground transmission circuit suitable with the overhead transmission line transmission line capability is to adapt to different abominable natural environments.This gas insulation electric power line comprises shell and inner wire, and this inner wire is positioned at shell and coaxial with shell.This inner conductor is fixed by disc insulator, and the below is supported by some supporting insulators.Fill with insulating gas in space between inner conductor and shell.At present the insulating gas of gas insulation electric power line commonly used for SF6 or based on the admixture of gas of SF6.When using SF6 as the insulating gas of gas insulation electric power line, the leakage of SF6 also must observe the extreme strict international standard of restriction (in the reality, they must be no more than the annual SF6 that adds 1%).Though the SF6 insulation level is better, it is heavier than air, be difficult to decompose, and be a kind of gas that limits use.SF6 not only environmental-protecting performance is relatively poor, the costliness of price comparison simultaneously.Therefore use SF6 also just to improve the cost of gas insulation electric power line as the insulating gas of gas insulation electric power line.
The feature of environmental protection of SF6 is poor, and it is a kind of forbidding gas that causes greenhouse effect.For the SF6 gaseous diffusion that prevents to reveal arrives atmosphere, must use the gas of high price to reclaim and attending device.Therefore, use SF6 and mist thereof to have the high problem of later maintenance stage expense as the insulating gas of insulation power transmission line.
Summary of the invention
The object of the present invention is to provide a kind of gas insulation electric power line, the insulating gas based on SF6 costs an arm and a leg in traditional gas insulation electric power line to solve, the problem of feature of environmental protection difference.
For achieving the above object, a kind of gas insulation electric power line of the present invention, this gas insulation electric power line comprise shell and the inner wire coaxial with shell, and the space between shell and the inner wire is insulation gas filled, and this insulating gas is a dry decontamination compressed air.The compressed-air actuated pressure of the dry decontamination that fills between shell and the inner wire is 1.5MPa～2.5Mpa.The compressed-air actuated dust granularity of dry decontamination is less than or equal to 0.1 μ m.The compressed-air actuated oil content of dry decontamination is less than or equal to 0.01mg/m
3The compressed-air actuated moisture of dry decontamination is less than or equal to-70 degrees centigrade condensation point.
Compare with traditional gas insulation electric power line, gas insulation electric power line of the present invention substitutes traditional insulating gas based on SF6 by adopting dry decontamination compressed air as the insulating gas of filling between shell and the inner wire, not only can solve the expensive problem of traditional insulating gas, can improve the feature of environmental protection of gas insulation electric power line simultaneously.
Description of drawings
Below in conjunction with the drawings and specific embodiments gas insulation electric power line of the present invention is made further specific description in detail.
Fig. 1 is the gas insulation electric power line structural representation.
Fig. 2 is the pressure-dependent test curve figure of compressed air breakdown strength.
Embodiment
See also the structure of gas insulation electric power line shown in Figure 1, gas insulation electric power line comprises shell 1 and the inner wire 2 coaxial with shell 1, and inner wire 2 is fixing by disc insulator 3, and supporting insulator 4 supports.Fill with insulating gas in space between shell 1 and the inner wire 2.The insulating gas of gas insulation electric power line of the present invention is a dry decontamination compressed air.This dry decontamination compressed air is that standard No. is 1 grade standard that GB/T13277-91 generally uses the compressed air quality grade.Be that the compressed-air actuated dust granularity of dry decontamination is less than or equal to 0.1 μ m.The compressed-air actuated oil content of dry decontamination is less than or equal to 0.01mg/m
3The compressed-air actuated moisture of dry decontamination is less than or equal to-70 degrees centigrade condensation point.
See also the pressure-dependent test curve figure of compressed air breakdown strength shown in Figure 2, curve 2 is that common compressed air (the not air of process other processing except that compression) increases the schematic diagram that its breakdown strength changes with pressure; Curve 1 changes schematic diagram for the compressed-air actuated breakdown strength of dry decontamination that meets 1 grade standard with its pressure.Curve 1 and curve 2 can be found out with under the equal pressure in the comparison diagram 2, meet the compressed-air actuated breakdown strength of 1 grade standard dry decontamination and are significantly higher than common compressed air, and the compressed-air actuated insulation level of dry decontamination of 1 corresponding grade standard is far above common compressed air.
Reasoning theoretically, the compressed-air actuated maximum dust granularity of dry decontamination be less than 0.1 μ m, the breakdown strength of this dried compressed air, and promptly insulation level can further improve.In like manner, the oil content of dried compressed air is less than 0.01mg/m
3, the compressed-air actuated breakdown strength of dry decontamination, promptly insulation level has further raising.In like manner, the moisture of dried compressed air is less than-70 degrees centigrade condensation point, the air breakdown intensity of dried compressed air, and promptly insulation level can further improve.Therefore, 1 grade standard and the dry decontamination compressed air that is higher than 1 grade standard all can serve as the insulating gas that charges between the inner wire and shell in the gas-insulated line.
Be further to improve the insulation level of 1 grade standard air, the air of 1 grade standard is made as compressed air, make it reach default breakdown strength.Curve 1 can find out that the dry decontamination compressed air pressure of making is big more from Fig. 2, and its breakdown strength is high more.
At present, gas insulation electric power line realizes that in advance the parameter of four kinds of high-tension electricities carrying sees also table 1.The rated voltage of four kinds of high-tension electricities sees also first hurdle in the table 1.The insulation that requires insulating gas in gas insulation electric power line level over the ground sees also the 8th hurdle.Partial discharge requires to see also the 9th hurdle.The voltage of carrying is high more, requires the compressed-air actuated insulation level of dry decontamination high more.The compressed-air actuated insulation level of dry decontamination depends on two factors for a short time in the gas insulation electric power line: 1, the spacing between gas insulation electric power line inner wire and the shell; 2, the compressed-air actuated breakdown strength of dry decontamination.The compressed-air actuated gas insulation electric power line of dry decontamination that uses two kinds of different pressures is an insulation level between the inner wire that reaches identical and the shell, and the compressed-air actuated gas insulation electric power line of the dry decontamination that working pressure is little need be by increasing the insulation level that spacing (the transversal diameter of increase gas insulation electric power line) between inner wire and the shell reach the big compressed-air actuated gas insulation electric power line of dry decontamination of working pressure.Yet when the big dry decontamination compressed air of working pressure, it is thicker that the shell of gas insulation electric power line need be made.
No matter increase the spacing between inner wire and the shell, the wall thickness that still increases shell all can increase the cost of manufacture of gas insulation electric power line.Transmitting rated voltage with gas insulation electric power line is that the high-tension electricity of 126kV is an example, and insulating gas adopts the dry decontamination compressed air of 1.5Mpa.With reference to the curve 1 of figure 2, the compressed-air actuated breakdown strength of 1 grade standard dry decontamination of 1.5Mpa is about 34kV/mm.If require gas insulation electric power line need reach rated lightning impulse withstand voltage 550kV standard, then the shell of gas insulation electric power line and the distance between the inner wire are 550/34, are about 16.2 millimeters.The size of the gas insulation electric power line of this size is in the standard making scope of gas insulation electric power line of rated voltage 126kV is carried in expection, and the dry decontamination compressed air that therefore adopts 1.5Mpa is feasible when carrying the relatively low high-tension electricity of rated voltage as the gas insulation electric power line of insulating gas.
Transmitting rated voltage with gas insulation electric power line is that the high-tension electricity of 550kV is an example, and insulating gas adopts the dry decontamination compressed air of 2.5Mpa.With reference to the curve 1 of figure 2, the compressed-air actuated breakdown strength of 1 grade standard dry decontamination of 2.5Mpa is about 48kV/mm.If require gas insulation electric power line need reach rated lightning impulse withstand voltage 1550kV standard, then the shell of gas insulation electric power line and the distance between the inner wire are 1550/48, are about 32.3 millimeters.The size of the gas insulation electric power line of this size is in the standard making scope of the gas insulation electric power line of expection conveying rated voltage 550kV.Therefore the dry decontamination compressed air that adopts 2.5Mpa is feasible when carrying the higher relatively high-tension electricity of rated voltage as the gas insulation electric power line of insulating gas.
Transmitting rated voltage with gas insulation electric power line is that the high-tension electricity of 252kV is an example, and insulating gas adopts the dry decontamination compressed air of 2.2Mpa.With reference to the curve 1 of figure 2, the compressed-air actuated breakdown strength of 1 grade standard dry decontamination of 2.2Mpa is about 44kV/mm.If require gas insulation electric power line need reach rated lightning impulse withstand voltage 1050kV standard, then the shell of gas insulation electric power line and the distance between the inner wire are 1050/44, are about 23.86 millimeters.The size of the gas insulation electric power line of this size is in the standard making scope of the gas insulation electric power line of expection conveying rated voltage 252kV.Therefore the dry decontamination compressed air that adopts 2.2Mpa is feasible when carrying the higher relatively high-tension electricity of rated voltage as the gas insulation electric power line of insulating gas.
More than three embodiment all be that rated lightning impulse withstand voltage with gas insulation electric power line serves as with reference to selecting the compressed-air actuated pressure of dry decontamination, also can rated power frequency withstand voltage under other conditions or the nominal operation surge voltage as with reference to selecting the compressed-air actuated pressure of dry decontamination, do not repeat them here.Can find out from above three enforcements, carry voltage standard, carry the gas insulation electric power line standard of this voltage standard to make the insulation level (rated power frequency withstand voltage, rated lightning impulse withstand voltage or nominal operation surge voltage) that scope and gas insulation electric power line need reach to select the dry decontamination compressed air of 1.5Mpa～2.5Mpa as insulating gas according to gas insulation electric power line.Select the dimensional standard scope of the gas insulation electric power line of high-tension electricity parameter that the compressed-air actuated concrete force value of dry decontamination carries on gas insulation electric power line and design to decide.
Adopt the above dry decontamination compressed air of 1 grade standard or 1 grade standard as insulating gas among the present invention in the gas insulation electric power line between inner wire 2 and the shell 1, can guarantee effectively that gas insulation electric power line normally transmits electric power under more abominable natural environment.Because the dry decontamination compressed air feature of environmental protection is good, atmosphere is not polluted, even appearring in the later stage, small amount of leakage do not need to adopt the specific gas retracting device to reclaim and handle yet, save the later stage maintenance cost.
Table 1
Claims (5)
1, a kind of gas insulation electric power line, described gas insulation electric power line comprise shell and the inner wire coaxial with shell, and the space between described shell and the inner wire is insulation gas filled, it is characterized in that, described insulating gas is a dry decontamination compressed air.
2, gas insulation electric power line as claimed in claim 1 is characterized in that, the compressed-air actuated pressure of the dry decontamination that fills between described shell and the inner wire is 1.5MPa～2.5Mpa.
3, gas insulation electric power line as claimed in claim 1 is characterized in that, the compressed-air actuated dust granularity of described dry decontamination is less than or equal to 0.1 μ m.
4, gas insulation electric power line as claimed in claim 1 is characterized in that, the compressed-air actuated oil content of described dry decontamination is less than or equal to 0.01mg/m
3
5, gas insulation electric power line as claimed in claim 1 is characterized in that, the compressed-air actuated moisture of described dry decontamination is less than or equal to-70 degrees centigrade condensation point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100406467A CN101315817A (en) | 2008-07-16 | 2008-07-16 | Gas insulation electric power line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100406467A CN101315817A (en) | 2008-07-16 | 2008-07-16 | Gas insulation electric power line |
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|---|---|
| CN101315817A true CN101315817A (en) | 2008-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008100406467A Pending CN101315817A (en) | 2008-07-16 | 2008-07-16 | Gas insulation electric power line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795017A (en) * | 2014-03-03 | 2014-05-14 | 江苏神马电力股份有限公司 | Gas-insulated power transmission line |
| CN104052011A (en) * | 2014-07-09 | 2014-09-17 | 江苏神马电力股份有限公司 | Gas-insulated power transmission line |
| RU2621900C2 (en) * | 2010-12-14 | 2017-06-08 | Абб Текнолоджи Аг | Dielectric insulating medium |
-
2008
- 2008-07-16 CN CNA2008100406467A patent/CN101315817A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2621900C2 (en) * | 2010-12-14 | 2017-06-08 | Абб Текнолоджи Аг | Dielectric insulating medium |
| CN103795017A (en) * | 2014-03-03 | 2014-05-14 | 江苏神马电力股份有限公司 | Gas-insulated power transmission line |
| CN104052011A (en) * | 2014-07-09 | 2014-09-17 | 江苏神马电力股份有限公司 | Gas-insulated power transmission line |
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Open date: 20081203 |