CN202949190U - Shielding circuit for inhibiting ground synthetic field intensity of high-voltage direct-current circuit - Google Patents
Shielding circuit for inhibiting ground synthetic field intensity of high-voltage direct-current circuit Download PDFInfo
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- CN202949190U CN202949190U CN 201220638120 CN201220638120U CN202949190U CN 202949190 U CN202949190 U CN 202949190U CN 201220638120 CN201220638120 CN 201220638120 CN 201220638120 U CN201220638120 U CN 201220638120U CN 202949190 U CN202949190 U CN 202949190U
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- 230000002401 inhibitory effect Effects 0.000 title 1
- 230000005540 biological transmission Effects 0.000 claims abstract description 31
- 239000004020 conductor Substances 0.000 claims description 85
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 239000012212 insulator Substances 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 7
- 239000000725 suspension Substances 0.000 abstract description 5
- 230000000452 restraining effect Effects 0.000 abstract 1
- 230000001629 suppression Effects 0.000 abstract 1
- 230000005764 inhibitory process Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001983 electron spin resonance imaging Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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Abstract
The utility model relates to a shielded line for restraining high voltage direct current circuit ground synthetic field intensity belongs to electric power system transmission line electromagnetic environment protection technical field. The shielding circuit comprises a plurality of shielding wires, a shielding wire tower body for erecting the shielding wires, 1 layer of cross arms matched with the shielding wire tower body, and a plurality of suspension points for suspending shielding wire suspension parts, wherein the cross arms and the tower neck are provided with the suspension points; a plurality of shielding wire suspension points are arranged on the cross arm at equal intervals and used for suspending shielding wires in different arrangement modes. The central shaft of the shielding wire tower is 3m outside the straight line of the center of the transmission wire in relative horizontal position. The utility model discloses can be on the basis that does not change original transmission line construction scheme, control the electromagnetic environment parameter around the direct current transmission line. The suppression of the ground synthetic field intensity is realized on the premise of not improving the radio interference, audible noise and corona loss, the construction cost of the tower can be greatly saved, and meanwhile, the transmission corridor is reduced, so that the extra-high voltage direct current transmission project is more economical and reasonable.
Description
Technical field
The utility model belongs to power system transmission line electromagnetic environment guard technology field, relates to a kind of shielded line for suppressing hvdc transmission line ground formate field intensity.
Background technology
The corona phenomenon of ultra-high-tension power transmission line is engineering design, construction and the key technical problem that needs consideration in service.On the one hand, increase Transmission Cost thereby corona can produce electric energy loss, on the other hand, radio interference, audible noise and the space ion current that corona produces can affect transmission line periphery electromagnetic environment.Along with the development of economy and the enhancing of common people's environmental consciousness, the electromagnetic environment problem is further noticeable, and especially in the extra-high voltage direct-current engineering, due to the raising of electric pressure, the electromagnetic environment problem is more outstanding.
In the DC power transmission line design, mainly optimize conductor selection to improve the electromagnetic environment problem by external empirical equations such as EPRI, BPA at present.The method often causes construction investment significantly to increase, and solves well simultaneously that the transmission of electricity corridor is nervous, the ground field intensity is difficult to the problems such as control under circuit, and line electricity magnetic disturbance improved strength is also also not obvious.
Studies show that setting up shielding conductor under DC line can significantly reduce the ground formate field intensity on the basis of not improving radio interference and audible noise level.The improvement of above electromagnetic environment parameter will reduce again the shaft tower cost of actual DC power transmission engineering.Simultaneously the shielding conductor cost is low, and can reduce because of the resident housing demolition of transmission of electricity corridor through causing, has reduced the integral body investment of power transmission engineering on largely.But the effect of shielded pair radio interference, audible noise, ion current still lacks research.Simultaneously, for extra high voltage line How to choose shielding conductor quantity, arrangement pitch, the layout theoretical foundation of highly still needing.Therefore propose a kind of shielded line method for designing be used to improving ground field intensity under extra high voltage direct current transmission line and have very outstanding construction value.
The utility model content
The purpose of this utility model is for overcoming the weak point of prior art, a kind of shielded line for suppressing hvdc transmission line ground formate field intensity is proposed, to realize the reduction of ground formate field intensity extreme value, on the electromagnetic environment parameter such as radio interference, audible noise and ground ion flow density, inhibition is arranged also simultaneously.
A kind of shielded line for suppressing hvdc transmission line ground formate field intensity that the utility model proposes, it is characterized in that, this shielded line comprises many shielding conductors, is used for setting up the shielding conductor shaft tower tower body of shielding conductor, 1 layer of cross-arm of shielding conductor shaft tower body collocation, a plurality of hitch points for hanging the shielding conductor suspender that cross-arm is provided with; A plurality of shielding conductor hitch points equidistantly are set on cross-arm, are used for hanging the shielding conductor of different arrangements.Shielding conductor shaft tower central shaft relative level position is to be positioned at 3m outside the transmission pressure center.
Described shielded line can adopt steel reinforced aluminium conductor, and line style can be LGJ-50/8, LGJ-70/40, and any one among LGJ-120/25, LGJ-120/70, LGJ-240/40 or LGJ-300/70, shielding conductor radical are 1 ~ 3.
Described shaft tower tower body can be cement shaft tower or Simple steel shaft tower; Shaft tower high 17 is to 20m.
Described collocation has 1 layer of cross-arm, and the cross-arm overall length is 6m, equidistant 7 shielding conductor hitch points that distribute on cross-arm.
Described shielding conductor hitch point can adopt metal anchor ear form, be connected between shielding conductor and shaft tower to adopt shielding conductor directly to be connected to hitch point by clamp pipe and U-loop, or shielding conductor is connected to monolithic insulator by end clips spool and U-loop, then is connected to hitch point.
Described shielding conductor ground connection can be adopted at metal anchor ear hitch point place and directly is connected with shaft tower, passes through tower grounding; Or directly be connected with Grounding Grids by downlead step by step.The earth resistance scope is at 30 Ω ~ 50 Ω.
Described shielding conductor can be single, hangs on cross-arm center suspension point; The hitch point height is 19m, sag 7m, and minimum is 12m to ground level, average height is 15.33m.
Described shielding conductor can be on head end, centre and the end hanging point that three shielding conductors hang on cross-arm, and the hitch point height is 16m.
Characteristics of the present utility model and beneficial effect are as follows:
1, the shielded line that the utility model proposes can be controlled DC power transmission line electromagnetic environment parameter on every side on the basis that does not change original transmission line construction scheme.Realize the inhibition to the ground formate field intensity under the prerequisite that does not improve radio interference, audible noise and corona loss, inhibition reaches as high as 55%.
2, the shielded line that the utility model proposes can be optimized DC transmission engineering shaft tower design by the inhibition to electromagnetic environment parameter, greatly saves shaft tower construction cost.
3, the shielded line that the utility model proposes reduces transmission of electricity corridor will significantly reduce because of link tester crosses the removal cost that local-style dwelling houses causes, and makes the extra-high voltage direct-current transmission engineering reasonable more economically.
Description of drawings
Fig. 1 is shielded line embodiment 1 structural representation of the present utility model.
Fig. 2 is shielded line embodiment 2 structural representations of the present utility model.
Specific implementation method
A kind of shielded line for suppressing hvdc transmission line ground formate field intensity that the utility model proposes reaches by reference to the accompanying drawings embodiment and is described in detail as follows.
A kind of shielded line structure for suppressing hvdc transmission line ground formate field intensity that the utility model proposes as shown in Figure 1, comprise many shielding conductor (not shown)s, be used for setting up the shielding conductor shaft tower tower body 1 of shielding conductor, the cross-arm 2 of shielding conductor shaft tower body collocation, a plurality of hitch points for hanging the shielding conductor suspender that cross-arm and tower neck are provided with;
The shielding conductor that the utility model is selected adopts steel reinforced aluminium conductor, and the shielding conductor radical can be 1 to 3.Line style can be LGJ-50/8, LGJ-70/40, any one in LGJ-120/25, LGJ-120/70, LGJ-240/40 or LGJ-300/70.
Shielding conductor shaft tower of the present utility model can adopt cement shaft tower or Simple steel shaft tower.Tower height 17 is to 20m.Be furnished with 1 layer of cross-arm, the cross-arm overall length is 6m, and 7 shielding conductor hitch points equidistantly are set on cross-arm, is used for hanging the shielding conductor of different arrangements.Shielding conductor shaft tower central shaft relative level position is to be positioned at 3m outside transmission pressure (being polar conductor) center.Relative position between the relative level position of shielding conductor and polar conductor, shielded pair ground average height and many shielding conductors is relevant with the ground formate field intensity of shielding conductor radical and generation, and wherein three shielding conductors are generally arranged on the equidistant hanging point of cross-arm.Shielding conductor ground connection also can be adopted two kinds of earthing modes: 1) directly be connected with shaft tower at metal anchor ear hitch point place, pass through tower grounding.2) passing through step by step, downlead directly is connected with Grounding Grids.The earth resistance scope is at 30 Ω ~ 50 Ω.
The shielding conductor suspender adopts metal anchor ear form, can adopt two kinds of concrete structures that shielding conductor is connected with shaft tower: the shielding conductor suspender that 1) is consisted of by clamp pipe and U-loop, directly shielding conductor is connected to hitch point 2) the shielding conductor suspender that consisted of by the clamp pipe, U-loop and the monolithic insulator that are arranged on the shielding conductor end, clamp pipe and the U-loop of shielding conductor end are connected to monolithic insulator, then are connected to hitch point.Two kinds of different connected modes depend on the difference of ground connection form.
The specific implementation of each parts of embodiment of the present utility model is respectively described below:
Embodiment 1
The present embodiment adopts above-mentioned shielded line structure, as shown in Figure 1; Wherein polar conductor institute making alive is ± 800kV, and the shielding conductor overall length is 300m, and central span is 400m.
The shielding conductor shaft tower tower body of the present embodiment adopts cement pole 11; The shielding conductor that adopts is selected the single shielding conductor (not shown) of LGJ-70/40 model, hangs on that in the center hanging point 13(figure of cross-arm 12,7 circles on cross-arm are hanging point); The ground formate field intensity inhibition that produces when this arranges is best.The shielding conductor tower erection is in positive polarity wire one side, and the high 20m of shaft tower exhales to claim high 19m; The hitch point height is 19m, sag 7m, and minimum is 12m to ground level, average height is 15.33m.Shielding conductor directly is connected with shaft tower at metal anchor ear hitch point place, and suspender is made of clamp pipe and U-loop, passes through tower grounding.
Embodiment 2
Polar conductor institute making alive, shielding conductor overall length, central span are 400m with embodiment 1.The shielding conductor shaft tower tower body of the present embodiment adopts steel pole tower 21, as shown in Figure 2; The shielding conductor that adopts is selected 3 shielding conductors of LGJ-300/70 model, three shielding conductors hang on head end hanging point 23, middle hanging point 24 and the end hanging point 25 of cross-arm 22 (7 circles in figure on cross-arm are hanging point), and the ground formate field intensity inhibition that produces when this arranges is best.The shielding conductor tower erection is in negative polarity wire one side, and the high 17m of shaft tower exhales to claim high 16m.Take the negative polarity wire as reference, three shielding conductor relative level positions are respectively negative polarity wire center, outer 3m, outer 6m.The hitch point height is 16m, sag 7m, and minimum is 9m to ground level, average height is 12.33m.Shielding conductor directly is connected with Grounding Grids by downlead step by step, and suspender is made of clamp pipe, U-loop and monolithic insulator, clamp pipe and the U-loop of shielding conductor end is connected to monolithic insulator, then is connected to hitch point, and earth resistance is chosen 40 Ω.
Claims (8)
1. shielded line that be used for to suppress hvdc transmission line ground formate field intensity, it is characterized in that, this shielded line comprises many shielding conductors, is used for setting up the shielding conductor shaft tower tower body of shielding conductor, 1 layer of cross-arm of shielding conductor shaft tower body collocation, a plurality of hitch points for hanging the shielding conductor suspender that cross-arm is provided with; A plurality of shielding conductor hitch points equidistantly are set on cross-arm, are used for hanging the shielding conductor of different arrangements.Shielding conductor shaft tower central shaft relative level position is the outer 3m of place, transmission pressure center straight line.
2. shielded line as claimed in claim 1, is characterized in that, described shielded line adopts steel reinforced aluminium conductor, line style can be LGJ-50/8, LGJ-70/40, any one among LGJ-120/25, LGJ-120/70, LGJ-240/40 or LGJ-300/70, shielding conductor radical are 1～3.
3. shielded line as claimed in claim 1, is characterized in that, described shaft tower tower body is cement shaft tower or Simple steel shaft tower; Shaft tower high 17 is to 20m.
4. shielded line as claimed in claim 1, is characterized in that, described cross-arm overall length is 6m, equidistant 7 shielding conductor hitch points that distribute on cross-arm.
5. shielded line as claimed in claim 1, it is characterized in that, described shielding conductor hitch point adopts metal anchor ear form, be connected between shielding conductor and shaft tower and adopt shielding conductor directly to be connected to hitch point by clamp pipe and U-loop, or shielding conductor is connected to monolithic insulator by end clips spool and U-loop, then is connected to hitch point.
6. shielded line as claimed in claim 1, is characterized in that, described shielding conductor ground connection is adopted at metal anchor ear hitch point place and directly is connected with shaft tower, passes through tower grounding; Or directly be connected with Grounding Grids by downlead step by step.The earth resistance scope is at 30 Ω ~ 50 Ω.
7. shielded line as claimed in claim 4, is characterized in that, described shaft tower height is 20m, exhales to claim highly to be 19m; Shielding conductor is single, hangs on the cross-arm central point; The hitch point height is 19m, sag 7m, and minimum is 12m to ground level, average height is 15.33m.
8. shielded line as claimed in claim 4, is characterized in that, described shaft tower height is 17m, exhales to claim highly to be 16m; Shielding conductor be three shielding conductors hang on cross-arm head end, centre and end hanging point on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220638120 CN202949190U (en) | 2012-11-28 | 2012-11-28 | Shielding circuit for inhibiting ground synthetic field intensity of high-voltage direct-current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220638120 CN202949190U (en) | 2012-11-28 | 2012-11-28 | Shielding circuit for inhibiting ground synthetic field intensity of high-voltage direct-current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202949190U true CN202949190U (en) | 2013-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220638120 Expired - Lifetime CN202949190U (en) | 2012-11-28 | 2012-11-28 | Shielding circuit for inhibiting ground synthetic field intensity of high-voltage direct-current circuit |
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| Country | Link |
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| CN (1) | CN202949190U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983535A (en) * | 2012-11-28 | 2013-03-20 | 南方电网科学研究院有限责任公司 | Shielding circuit for improving ground field intensity of direct current transmission line |
| CN104006733A (en) * | 2014-06-05 | 2014-08-27 | 国家电网公司 | Method for determining distance between down lead buried framework and bottom-phase cross arm of tower |
-
2012
- 2012-11-28 CN CN 201220638120 patent/CN202949190U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983535A (en) * | 2012-11-28 | 2013-03-20 | 南方电网科学研究院有限责任公司 | Shielding circuit for improving ground field intensity of direct current transmission line |
| CN104006733A (en) * | 2014-06-05 | 2014-08-27 | 国家电网公司 | Method for determining distance between down lead buried framework and bottom-phase cross arm of tower |
| CN104006733B (en) * | 2014-06-05 | 2017-01-25 | 国家电网公司 | Method for determining distance between down lead buried framework and bottom-phase cross arm of tower |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130522 |
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| CX01 | Expiry of patent term |