CN204257834U - A kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow - Google Patents
A kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow Download PDFInfo
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- CN204257834U CN204257834U CN201420678020.XU CN201420678020U CN204257834U CN 204257834 U CN204257834 U CN 204257834U CN 201420678020 U CN201420678020 U CN 201420678020U CN 204257834 U CN204257834 U CN 204257834U
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- displacement current
- dispersed flow
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 21
- 239000002689 soil Substances 0.000 claims description 9
- 230000001603 reducing effect Effects 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 241000283080 Proboscidea <mammal> Species 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004379 similarity theory Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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Abstract
The utility model discloses a kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow, comprise the first earthing device, the first described earthing device is embedded in underground, it is characterized in that, also comprise the second earthing device, the second described earthing device is embedded in the below of the first earthing device, parallel to each other with the first earthing device and do not contact.The utility model can be widely used in the grounding design of centralized earthing device, and it is obvious that the earthing device obtained has resistance reducing effect, and construction and installation are easy, greatly can improve the fail safe of power system operation.
Description
Technical field
The utility model relates to electric power system Lightning protection field, particularly a kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow.
Background technology
Power system operation experience shows, thunderbolt is the main cause causing most of transformer station and transmission line trip accident, and the impulse earthed resistance of its centralized earthing device directly has influence on the lightning protection properties of transformer station, circuit.In high soil resistivity, because the impulse earthed resistance of earthing device is often very large, threaten to system safety operation, the Transient grounding resistance therefore reducing high soil resistivity centralized earthing device is significant for the fail safe improving electric power system.Usually the impact adopted in engineering fall resistance measure mainly contain strengthen earth electrode size, utilize natural grounding substance etc.But these methods respectively have its relative application conditions, the design of grounding met the demands is still very difficult.Blindly increase the size of earth electrode, can not reach and well impact resistance reducing effect, the waste of material may be caused.
Research shows, the diffusing of impulse current in soil is mainly by completing under conduction current and displacement current acting in conjunction.Due to soil and non-conductor, it has medium character simultaneously, and therefore, in diffusing electric current, displacement current account for greatly.Especially for high resistivity area, displacement current is often greater than conduction current, in diffusing process, have very important effect.
Utility model content
Cannot reach the technical problem of impacting preferably resistance reducing effect to solve earthing device, the utility model provides a kind of and is convenient to realize and the displacement current that utilizes with splendid impact resistance reducing effect improves centralized earthing device and the method for arranging of characteristics of the dispersed flow.
In order to realize above-mentioned technical purpose, the technical solution of the utility model is, a kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow, comprise the first earthing device, the first described earthing device is embedded in underground, also comprise the second earthing device, the second described earthing device is embedded in the below of the first earthing device, parallel to each other with the first earthing device and do not contact.
Described a kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow, the second described earthing device adopts the earthing device identical with the first earthing device.
Described a kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow, the electric capacity C that centralized earthing device is formed is:
C＝εS/d
Wherein, ε is soil dielectric constant, and S is that the right opposite of the first earthing device and the second earthing device amasss, and d is the distance between the first earthing device and the second earthing device.
Utilize displacement current to improve a method for arranging for the centralized earthing device of characteristics of the dispersed flow, first bury the first earthing device underground, bury the second earthing device underground then in the first earthing device parallel beneath, and two earthing device are not in contact with each other.
Described a kind of method for arranging utilizing displacement current to improve the centralized earthing device of characteristics of the dispersed flow, the second described earthing device adopts the earthing device identical with the first earthing device.
Described a kind of method for arranging utilizing displacement current to improve the centralized earthing device of characteristics of the dispersed flow, the electric capacity C that centralized earthing device is formed is:
C＝εS/d
Wherein, ε is soil dielectric constant, and S is that the right opposite of the first earthing device and the second earthing device amasss, and d is the distance between the first earthing device and the second earthing device.
Double-deck centralized earthing device is improved in fact earth electrode capacity effect over the ground, i.e. basis
C＝εS/d
Knownly choose distance between suitable two-layer centralized earthing device to increase electric capacity.Because lightning current equivalent frequency is high, and high-frequency current easily circulates in capacitive reactances.Therefore utilize this feature of high-frequency current, make electric current be undertaken releasing by electric capacity rapidly thus reach the object improving characteristics of the dispersed flow.
The utility model can be widely used in the grounding design of centralized earthing device, and it is obvious that the earthing device obtained has resistance reducing effect, and construction and installation are easy, greatly can improve the fail safe of power system operation.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of double-deck centralized earthing device of the present utility model;
Fig. 2 is the equivalent circuit diagram of the double-deck centralized earthing device of the utility model;
The centralized earthing device that Fig. 3 adopts for the utility model carries out analogue test platform schematic diagram;
Wherein 1 to be the first earthing device, 2 be the second earthing device, 3 is isolating transformer, 4 is rectifying part, 5 is live part, 6 is ball discharge gap, 7 is impulse voltage divider, 8 is optical fiber, 9 is shunt, 10 is earthing device model, 11 is isolating transformer, 12 is artificial husky pond (steel plate).
Embodiment
The utility model proposes a kind of earthing device utilizing displacement current to improve characteristics of the dispersed flow.The utility model is mainly by installing double-deck centralized earthing device, accelerate the velocity of liquid assets of displacement current, increase diffusing area, thus reach raising impact diffusing efficiency, reduce the object of Transient grounding resistance, and the impact characteristics analogue test platform schematic diagram provided for this centralized earthing device, to study the impact resistance reducing effect of individual layer and double-deck earthing device.Just method of operation of the present utility model is further described below:
See Fig. 1, in the present embodiment, the first earthing device length of side value being in upper strata is 5x5m, earthing material zinc-coated flat steel sheet, laying depth 0.8m; The the second earthing device length of side value being in lower floor is 13x13m, and laying depth is 3m.The structure of earthing device adopts common grounding device constructions, and be namely the sphere of movements for the elephants type structure that space is left in centre by the conductor material split of strip, this device also can adopt other grounding device constructions to implement.In figure, the area of the first earthing device is less, the area of the second earthing device is larger, this is due under general condition, upper layer of soil resistivity is higher, and lower soil resistivity is lower, at the larger earthing device of lower floor's erection space as primary ground pole, diffusing efficiency can be improved, lay the less auxiliary earthing apparatus of area on upper strata simultaneously, utilize displacement current to improve characteristics of the dispersed flow, thus improve the diffusing effect of overall centralized earthing device.And amass to maximize levels right opposite, two earthing device be arranged in parallel.
See Fig. 2, nonlinear resistance R
1with R
2represent the resistance variations, the C that cause because of cremate effect in diffusing process
1for the electric capacity between levels earthing device, C
2for earthing device direct-to-ground capacitance, and C
1much larger than C
2.Under impulse current effect, due to equivalent capacity C
1very large, its capacitive reactance is very little, the circulation of favourable displacement current, namely improves the ability that energy is released.
As shown in Figure 3, be the simulation test device of a set of centralized earthing device impact characteristics for verifying the utility model device effect.The simulation test device used in the utility model mainly comprises impact high-voltage large current generator, simulation the earth test flume, shunt, impulse voltage divider, digital oscilloscope, earthing device etc.The utility model have developed and a set ofly the packaged type of lightening strike simulating ripple can impact high-voltage large current generator pilot system for this reason, this system is made up of control cabinet, controller and transmission line system, can Based Intelligent Control produce electric current and voltage and generator body ball stand-off distance from, being easily understood in contact action interface, is convenient to the carrying out of analogue test.The material of the centralized earthing device in described test is identical with actual earthing device, and according to the principle of shock test similarity theory, size and buried depth are by actual conditions scaled down.Use the waveform of impulse current and surge voltage under the different earthing device of digital oscilloscope record in test, read the peak value of surge voltage and impulse current, and the impulse earthed resistance of calculating simulation earthing device.Show through simulated experiment, double-deck earthing device effectively can improve impact diffusing effect.
Claims (3)
1. the centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow, comprise the first earthing device, the first described earthing device is embedded in underground, it is characterized in that, also comprise the second earthing device, the second described earthing device is embedded in the below of the first earthing device, parallel to each other with the first earthing device and do not contact.
2. a kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow according to claim 1, is characterized in that, the second described earthing device adopts the earthing device identical with the first earthing device.
3. a kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow according to claim 1, it is characterized in that, the electric capacity C that centralized earthing device is formed is:
C＝εS/d
Wherein, ε is soil dielectric constant, and S is that the right opposite between the first earthing device and the second earthing device amasss, and d is the distance between the first earthing device and the second earthing device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420678020.XU CN204257834U (en) | 2014-11-13 | 2014-11-13 | A kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420678020.XU CN204257834U (en) | 2014-11-13 | 2014-11-13 | A kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow |
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| CN204257834U true CN204257834U (en) | 2015-04-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332727A (en) * | 2014-11-13 | 2015-02-04 | 国家电网公司 | Concentrated grounding device using displacement current to improve flow dispersion characteristic and arrangement method thereof |
| CN105514630A (en) * | 2016-01-28 | 2016-04-20 | 国网山西省电力公司临汾供电公司 | Absorption type grounding device low in impedance |
-
2014
- 2014-11-13 CN CN201420678020.XU patent/CN204257834U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332727A (en) * | 2014-11-13 | 2015-02-04 | 国家电网公司 | Concentrated grounding device using displacement current to improve flow dispersion characteristic and arrangement method thereof |
| CN105514630A (en) * | 2016-01-28 | 2016-04-20 | 国网山西省电力公司临汾供电公司 | Absorption type grounding device low in impedance |
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