CN203850445U - A high soil resistivity region grounding device - Google Patents
A high soil resistivity region grounding device Download PDFInfo
- Publication number
- CN203850445U CN203850445U CN201420120777.7U CN201420120777U CN203850445U CN 203850445 U CN203850445 U CN 203850445U CN 201420120777 U CN201420120777 U CN 201420120777U CN 203850445 U CN203850445 U CN 203850445U
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- Prior art keywords
- grounding
- flat steel
- soil resistivity
- resistance
- ground
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- 239000002689 soil Substances 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 33
- 239000010959 steel Substances 0.000 claims abstract description 33
- 238000003466 welding Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 9
- 230000005611 electricity Effects 0.000 description 2
- 230000002285 radioactive Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
Abstract
The utility model discloses a high soil resistivity region grounding device. The grounding device comprises a plurality of grounding plates. Each grounding plate is installed on the periphery of grounding flat steel. The grounding flat steel is also provided with a plurality of grounding electrodes. The grounding flat steel is also welded with the upper portion of a tower through a tower lightning protection downlead. The tower is fixed on the ground through tower stand bars. The grounding flat steel uses the grounding electrodes as nodes, and one grounding plate is arranged between each two adjacent nodes. The grounding area can be effectively increased; grounding resistance can be reduced; and a lightning protection level of lines can be raised.
Description
Technical field
The utility model relates to high soil resistivity earthing device.
Background technology
Existing tower grounding device adopts rectangular as earth electrode at the additional common round steel of tower leg and the band steel of each shaft tower mostly.In high soil resistivity, the earth electrode that this design needs common in the situation that is longer, earth resistance is excessive, but the area of earth electrode is not enough, in the area of high soil resistivity or be subject to landform restriction, often be difficult to reach the requirement that reduces earth resistance, result of use is poor.
Utility model content
The deficiency existing for solving prior art, the utility model discloses high soil resistivity earthing device, and this device can effectively increase contact area, reduces earth resistance, improves lightning protection level.
For achieving the above object, concrete scheme of the present utility model is as follows:
High soil resistivity earthing device, described earthing device comprises multiple ground plates, each ground plate is arranged on the periphery of grounding flat steel, on grounding flat steel, be also provided with multiple earth electrodes, grounding flat steel is also by the top welding of shaft tower lightning protection downlead and shaft tower, and shaft tower fixes on the ground by shaft tower leg;
Described grounding flat steel, with very node of ground connection, is provided with ground plate between every two adjacent nodes.
Described ground plate and grounding flat steel adopt two round steel welding, and welding round steel is the long jockey of 20cm.
Described grounding flat steel is square.
Described ground plate is 1m*1m ground plate.
Grounding flat steel is imbedded in underground 0.5 meter of depths, and the distance between adjacent floor is 1.5 meters, and the length of earth electrode is 2.5 meters.
In Practical Project, when earth electrode total length is 40m to 100m, 1m*1m ground plate can effectively increase earth electrode area, reduces earth resistance, and makes earth resistance and the economy optimized reach optimum simultaneously.
Impulse current is by the initial instantaneous of earth electrode, and the stable state of impact impedance and earth electrode or power frequency earthing resistance are irrelevant.At this moment the wave process of earth electrode plays a major role, and impact impedance equals wave resistance, in this patent, on original ground connection basis, has increased ground plate, and existing earth electrode wave process is extended, and can effectively reduce the wave impedance in earth electrode wave process.In the time that ripple moves toward earth electrode depths, on ripple electric current, the conduction current of soil will added, at this moment the impact impedance of earth electrode is mainly led and is decided by the inductance of earth electrode and the electricity of soil, i.e. " inductance-electricity is led " earial drainage process, now earth electrode is set up ground plate, diffusing effect is increased, promoted earth electrode discharge capacity.Finally, when the rate of change of electric current levels off to zero, inductance can omit to be disregarded, and impact impedance just shows the character of resistance, levels off to stable state or power frequency earthing resistance.For concentrated earth electrode, only consider resistance process, the long earth electrode of level in general resistivity area, only consider " inductance-electricity is led " earial drainage process, and the horizontal grounding objects in ultrahigh resistance rate area also should be considered wave process.In high soil resistivity. in order effectively to solve the too high problem of earth resistance, resistance falls in the general way that adopts extension ground connection, such as the horizontal extension radioactive ray of employing reduce shaft tower or send out, the earth resistance of electric substation, there is the place of utilizable low soil resistivity to fall resistance with extension earth mat as neighbouring, this is effective to reducing power frequency earthing resistance, but impact electric current, because the frequency of impulse current is higher. just should consider inductance, the capacity effect problem of extension earth electrode, and can not unconfined extension.Maximum perimetric length l
chcomputing formula is
in formula, ρ is soil resistivity; ε
rfor the relative dielectric constant on ground; Generally get ε
r=9,0.0265 for wave head times 3 μ s; 0.053 for wave head times 6 μ s.Perimetric length exceedes maximum and draws after spreading degree, adopt outer to draw ground connection very little to reducing the effect of impulse grounding, in high soil resistivity, soil resistivity is on original earth electrode basis, this patent size is much smaller than calculated value, thereby reach effective reduction earth resistance, increase ground connection effective area and economical and practical effect.
The beneficial effects of the utility model:
Judge line thunder protection performance quality, mainly weigh with lightning withstand level and tripping rate with lightning strike, the former is higher, and the latter is lower, all represents that lightning protection properties is better.In metal mineral reserves enrichment mountain area, ground resistivity compared with normal value is low conventionally, and ground region can accumulate a large amount of heterocharges contrary with thundercloud because of induction, thereby affects resistance to thunder characteristic.In high soil resistivity, the earth electrode that this design needs common in the situation that is longer, earth resistance is excessive, but the area of earth electrode is not enough, in the area of high soil resistivity or be subject to landform restriction, often be difficult to reach the requirement that reduces earth resistance, result of use is poor.On original ground connection basis, add this patent, can effectively increase contact area, reduce earth resistance resistance, put forward the high lightning protection level of circuit.
Brief description of the drawings
Fig. 1 the utility model overall structure vertical view;
Fig. 2 the utility model partial structurtes schematic diagram;
Fig. 3 the utility model overall structure front view;
In figure, 1 grounding flat steel; 2 earth electrodes; 3 shaft tower legs; 4 ground plates; 5 shaft tower lightning protection downleads; 6 pole and tower foundations.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is elaborated:
As Figure 1-3, high soil resistivity earthing device, described earthing device comprises multiple ground plates 4, each ground plate 4 is arranged on the periphery of grounding flat steel 1, on grounding flat steel 1, be also provided with multiple earth electrodes 2, the also top welding with shaft tower by shaft tower lightning protection downlead 5 of grounding flat steel 1, shaft tower fixes on the ground by shaft tower leg 3;
Described grounding flat steel 1, taking earth electrode 2 as node, is provided with ground plate 4 between every two adjacent nodes.
Described ground plate 4 adopts two round steel welding with grounding flat steel 1, and welding round steel is the long jockey of 20cm.
Described grounding flat steel 1 is square.
Described ground plate 4 is 1m*1m ground plate 4.
In Practical Project, when earth electrode 2 total lengths are 40m to 100m, 1m*1m ground plate 4 can effectively increase earth electrode area, reduces earth resistance, and makes earth resistance and the economy optimized reach optimum simultaneously.Grounding flat steel 1 is imbedded in underground 0.5 meter of depths, and the distance between adjacent floor 4 is 1.5 meters, and the length of earth electrode 2 is 2.5 meters.
Impulse current is by the initial instantaneous of earth electrode, and the stable state of impact impedance and earth electrode or power frequency earthing resistance are irrelevant.At this moment the wave process of earth electrode plays a major role, and impact impedance equals wave resistance, in this patent, on original ground connection basis, has increased ground plate, and existing earth electrode wave process is extended, and can effectively reduce the wave impedance in earth electrode wave process.In the time that ripple moves toward earth electrode depths, on ripple electric current, the conduction current of soil will added, at this moment the impact impedance of earth electrode is mainly led and is decided by the inductance of earth electrode and the electricity of soil, i.e. " inductance-electricity is led " earial drainage process, now earth electrode is set up ground plate, diffusing effect is increased, promoted earth electrode discharge capacity.Finally, when the rate of change of electric current levels off to zero, inductance can omit to be disregarded, and impact impedance just shows the character of resistance, levels off to stable state or power frequency earthing resistance.For concentrated earth electrode, only consider resistance process, the long earth electrode of level in general resistivity area, only consider " inductance-electricity is led " earial drainage process, and the horizontal grounding objects in ultrahigh resistance rate area also should be considered wave process.In high soil resistivity. in order effectively to solve the too high problem of earth resistance, resistance falls in the general way that adopts extension ground connection, such as the horizontal extension radioactive ray of employing reduce shaft tower or send out, the earth resistance of electric substation, there is the place of utilizable low soil resistivity to fall resistance with extension earth mat as neighbouring, this is effective to reducing power frequency earthing resistance, but impact electric current, because the frequency of impulse current is higher. just should consider inductance, the capacity effect problem of extension earth electrode, and can not unconfined extension.Maximum perimetric length l
chcomputing formula is
in formula, ρ is soil resistivity; ε
rfor the relative dielectric constant on ground; Generally get ε
r=9,0.0265 for wave head times 3 μ s; 0.053 for wave head times 6 μ s.Perimetric length exceedes maximum and draws after spreading degree, adopt outer to draw ground connection very little to reducing the effect of impulse grounding, in high soil resistivity, soil resistivity is on original earth electrode basis, this patent size is much smaller than calculated value, thereby reach effective reduction earth resistance, increase ground connection effective area and economical and practical effect.
Claims (4)
1. high soil resistivity earthing device, it is characterized in that, described earthing device comprises multiple ground plates, each ground plate is arranged on the periphery of grounding flat steel, on grounding flat steel, be also provided with multiple earth electrodes, grounding flat steel is also by the top welding of shaft tower lightning protection downlead and shaft tower, and shaft tower fixes on the ground by shaft tower leg;
Described grounding flat steel, with very node of ground connection, is provided with ground plate between every two adjacent nodes.
2. high soil resistivity as claimed in claim 1 earthing device, is characterized in that, described ground plate and grounding flat steel adopt two round steel welding, and welding round steel is the long jockey of 20cm.
3. high soil resistivity as claimed in claim 1 earthing device, is characterized in that, described grounding flat steel is square.
4. high soil resistivity as claimed in claim 1 earthing device, is characterized in that, described ground plate is 1m*1m ground plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420120777.7U CN203850445U (en) | 2014-03-17 | 2014-03-17 | A high soil resistivity region grounding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420120777.7U CN203850445U (en) | 2014-03-17 | 2014-03-17 | A high soil resistivity region grounding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203850445U true CN203850445U (en) | 2014-09-24 |
Family
ID=51563420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420120777.7U Expired - Fee Related CN203850445U (en) | 2014-03-17 | 2014-03-17 | A high soil resistivity region grounding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203850445U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825113A (en) * | 2014-03-17 | 2014-05-28 | 国家电网公司 | Grounding device for high-soil resistivity region |
| CN108521031A (en) * | 2018-07-03 | 2018-09-11 | 国网山东省电力公司惠民县供电公司 | A kind of tower grounding device |
| CN111257950A (en) * | 2020-02-12 | 2020-06-09 | 山东大学 | Ground electrode, system and embedding method |
-
2014
- 2014-03-17 CN CN201420120777.7U patent/CN203850445U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825113A (en) * | 2014-03-17 | 2014-05-28 | 国家电网公司 | Grounding device for high-soil resistivity region |
| CN103825113B (en) * | 2014-03-17 | 2016-04-20 | 国家电网公司 | High soil resistivity earthing device |
| CN108521031A (en) * | 2018-07-03 | 2018-09-11 | 国网山东省电力公司惠民县供电公司 | A kind of tower grounding device |
| CN108521031B (en) * | 2018-07-03 | 2019-10-11 | 国网山东省电力公司惠民县供电公司 | A kind of tower grounding device |
| CN111257950A (en) * | 2020-02-12 | 2020-06-09 | 山东大学 | Ground electrode, system and embedding method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20180317 |