CN203553377U - Multi-current scattering arm star-shaped grounding-electrode topological structure - Google Patents
Multi-current scattering arm star-shaped grounding-electrode topological structure Download PDFInfo
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- CN203553377U CN203553377U CN201320562354.6U CN201320562354U CN203553377U CN 203553377 U CN203553377 U CN 203553377U CN 201320562354 U CN201320562354 U CN 201320562354U CN 203553377 U CN203553377 U CN 203553377U
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Abstract
The utility model belongs to the field of electric system grounding for lightening protection, and relates to a multi-current scattering arm star-shaped grounding-electrode topological structure. The multi-current scattering arm star-shaped grounding-electrode topological structure is specifically suitable for a grounding electrode in a pole tower earth screen. A novel grounding electrode arrangement form is designed so that an impact grounding resistance value under a high earth resistivity can be reduced. According to the arrangement form, current scattering channels, in the grounding electrode, of a lightning current are increased, namely, each radiation branch of the star-shaped grounding electrode is additionally provided with at least one bifurcate current scattering arm, one end of each bifurcate current scattering arm is connected with the tail end of the corresponding radiation branch, the other end of each bifurcate current scattering arm extends in the radial direction, therefore, the better current scattering effect can be achieved, the impact performance of a grounding body is effectively improved, and the impact grounding resistance value of the grounding electrode is reduced. The structure is easy to manufacture and install, construction difficulty caused by the fact that the grounding electrode is lengthened blindly is avoided, a very good resistance reducing effect can be achieved, the performance is superior, and the structure is economical and reasonable.
Description
Technical field
The utility model belongs to electric power system lightning protection field, relate to a kind of many diffusings arm star earth electrode topological structure, specifically be applicable to the earth electrode in shaft tower earth mat, by designing new earth electrode arrangement form, can effectively reduce the impulse earthed resistance value under high soil resistivity.
Background technology
The design criterion of conventional tower grounding polar form mainly comprises:
1, earth electrode structure-due to four leg structures of shaft tower in practical application, and consider that shielding action is as far as possible little, and consider construction work amount, radial earth electrode is because of symmetrical configuration, and pad is few and be widely used.
2, effective length-because the equivalent frequency of lightning current is high, therefore the inductance of earth electrode self can suppress the diffusion of electric current, but in actual design, effective length is consistent with the requirement of power frequency earthing resistance, therefore when power frequency earthing resistance meets the demands, the length of grounding electrode generally can meet the requirement of effective length.
Whether power frequency earthing resistance is still usingd in the examination of earthing device qualified in sole criterion, but under the lightning current effect of high-frequency, amplitude, earth mat is let out in loose electric current process can produce strong spark effect and inductive effect, now power frequency characteristic cannot truly reflect the lightning protection effect of earthing device, need to consider the impact characteristics of earth electrode.Several conventional earth electrodes meet standard in power frequency characteristic above, but often not enough to some extent on impact characteristics.Therefore the utility model is exactly on the basis of conventional earth electrode, to improve, and makes Novel connecting earth polar can not only meet power frequency characteristic requirements, can also aspect impact characteristics, show good lightning protection effect.
Utility model content
The utility model is mainly to solve the existing technical problem of prior art; Provide a kind of when meeting ground network power frequency characteristic requirements, improved the impact characteristics of ground network, thereby improved a kind of many diffusings arm star earth electrode topological structure of the lightning protection level of circuit.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals:
Many diffusings arm star earth electrode topological structure, is characterized in that, increases at least one forked diffusing arm in each radiation branch of star earth electrode, the end of described forked diffusing arm one termination radiation branch, and the other end radially extends.
A kind of many diffusings arm star earth electrode topological structure above-mentioned, increases by three forked diffusing arms in described each radiation branch, the end of described forked diffusing arm one termination radiation branch, and the other end radially extends.
At above-mentioned a kind of many diffusings arm star earth electrode topological structure, three sections of this many diffusings arm star ground connection is R section, R1 section and R2 section, and R and R1 angle are 135 °, and R1 and R2 angle are 90 °, and the length of R section, R1 section, R2 section is respectively a, b, b; Three forked diffusing arms are respectively R11 section, R12 section and R13 section, and R11 section, R12 section and R13 segment length are c; And the length ratio of length a, b, c meets a:b:c=5:2:1.
Therefore, the utlity model has following advantage: effectively improve the impact characteristics of earth electrode, reduce the impulse earthed resistance value of earth electrode; Make simply, be easy to install, avoided blindly increasing the constructional difficulties that earth electrode length is brought, can play good resistance reducing effect, excellent performance, economical rationality again.
Accompanying drawing explanation
Fig. 1 is star-like earth electrode schematic diagram.
Fig. 2 is many diffusings arm star earth electrode schematic diagram.
Fig. 3 is the variation rule curve of the impulse earthed resistance of star-shaped electrode.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment:
Introduce the particular content in Novel connecting earth polar below:
Two diffusing arm star earth electrode arrangement forms are as Fig. 2.Concrete method is: in each radiation branch of star earth electrode, increase by three forked diffusing arms, and the end of forked diffusing arm one termination radiation branch, the other end radially extends.
In order to reduce the impulse earthed resistance of earth electrode, conventionally rely on and increase the size of earth electrode or the method for equivalent radius, the utility model is by increasing the diffusing passage of earth electrode, and the effective length that increases earth electrode achieves the goal.
The follow-on impact characteristics of star-like earth electrode: as shown in Figure 1, common star-like earth electrode has two radial branches, and many diffusings arm star earth electrode has increased by 6 Ge Duan branches on its basis, and modified model as shown in Figure 2.
The Changing Pattern of the impulse earthed resistance of many diffusings arm star earth electrode under different impulse current amplitudes, as shown in Figure 3.When impulse current amplitude hour, it is faster that the impulse earthed resistance of many diffusings arm star earth electrode declines, therefore the resistance reducing effect of many diffusings arm star earth electrode may be better.
When keeping, the length of earth electrode is consistent, increase the radial number of branches of earth electrode, be equivalent to increase the diffusing passage of earth electrode, simultaneously, the subbranch the increasing earth electrode end electric field that is conducive to distort, strengthen spark ionization effect, and then increase end diffusing, under the two comprehensive function, make the impulse earthed resistance of earth electrode decline thereupon.But the further increase along with the radial number of branches of earth electrode, cause the greatest irradiation radius of earthing device correspondingly to reduce, make to increase with the contact resistance of soil, meanwhile radial number of branches increases, and causes the shunting of each branch to reduce, and the diffusing density of each son field also reduces thereupon, when impulse current amplitude hour, each branch cannot produce enough strong spark ionization, so resistance reducing effect is not obvious, impulse earthed resistance is higher; But along with the increase of impulse current amplitude, the characteristic that the radial branch of end improves diffusing displays gradually, can estimate further increases when current amplitude, and the characteristics of the dispersed flow of many diffusings arm star earth electrode under impulse current amplitude can be more excellent.
Below the execution mode of many diffusings arm star earth electrode:
As Fig. 2, adopt material as identical in Fig. 1 electrode, weld star-like earth electrode R-R1-R2, making R and R1 angle is 135 °, and R1 and R2 angle are 90 °, and wherein the length of R, R1, R2 is respectively a, b, b.At A, two end points of B, by above-mentioned standard, weld star-shaped electrode R11-R12-R13, R21-R22-R23 respectively, its length is respectively c, c, c, c, c, c.Electrode length meets proportionate relationship a:b:c=5:2:1.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various modifications or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Claims (3)
1. the arm star of diffusing more than an earth electrode topological structure, is characterized in that, increases at least one forked diffusing arm in each radiation branch of star earth electrode, the end of described forked diffusing arm one termination radiation branch, and the other end radially extends.
2. a kind of many diffusings arm star earth electrode topological structure according to claim 1, is characterized in that, increases by three forked diffusing arms in described each radiation branch, the end of described forked diffusing arm one termination radiation branch, and the other end radially extends.
3. a kind of many diffusings arm star earth electrode topological structure according to claim 2, it is characterized in that, three sections of this many diffusings arm star ground connection is R section, R1 section and R2 section, and R and R1 angle are 135 °, R1 and R2 angle are 90 °, and the length of R section, R1 section, R2 section is respectively a, b, b; Three forked diffusing arms are respectively R11 section, R12 section and R13 section, and R11 section, R12 section and R13 segment length are c; And the length ratio of length a, b, c meets a:b:c=5:2:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320562354.6U CN203553377U (en) | 2013-09-11 | 2013-09-11 | Multi-current scattering arm star-shaped grounding-electrode topological structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320562354.6U CN203553377U (en) | 2013-09-11 | 2013-09-11 | Multi-current scattering arm star-shaped grounding-electrode topological structure |
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| CN203553377U true CN203553377U (en) | 2014-04-16 |
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| CN201320562354.6U Withdrawn - After Issue CN203553377U (en) | 2013-09-11 | 2013-09-11 | Multi-current scattering arm star-shaped grounding-electrode topological structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457045A (en) * | 2013-09-11 | 2013-12-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Multi-current scattering arm star-shaped grounding electrode topological structure |
| CN109298310A (en) * | 2017-07-25 | 2019-02-01 | 日本电产理德股份有限公司 | Link block, gauging fixture and base board checking device |
-
2013
- 2013-09-11 CN CN201320562354.6U patent/CN203553377U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457045A (en) * | 2013-09-11 | 2013-12-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Multi-current scattering arm star-shaped grounding electrode topological structure |
| CN109298310A (en) * | 2017-07-25 | 2019-02-01 | 日本电产理德股份有限公司 | Link block, gauging fixture and base board checking device |
| CN109298310B (en) * | 2017-07-25 | 2023-10-27 | 日本电产理德股份有限公司 | Connection module, inspection jig, and substrate inspection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140416 Effective date of abandoning: 20160914 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |