CN110444918B - Method and device for reducing impulse grounding resistance of power transmission line grounding body - Google Patents
Method and device for reducing impulse grounding resistance of power transmission line grounding body Download PDFInfo
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- CN110444918B CN110444918B CN201910717850.6A CN201910717850A CN110444918B CN 110444918 B CN110444918 B CN 110444918B CN 201910717850 A CN201910717850 A CN 201910717850A CN 110444918 B CN110444918 B CN 110444918B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000004020 conductor Substances 0.000 claims abstract description 28
- 230000000694 effects Effects 0.000 claims abstract description 18
- 230000005684 electric field Effects 0.000 claims abstract description 8
- 230000001965 increasing effect Effects 0.000 claims abstract description 8
- 238000010992 reflux Methods 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 abstract description 4
- 230000003313 weakening effect Effects 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
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Abstract
The invention discloses a method for reducing impulse grounding resistance of a grounding body of a power transmission line, which comprises the steps of arranging a horizontal electrode around the grounding body; the unevenness of an electric field near the horizontal electrode is increased, and the spark effect is enhanced; and a horizontal return electrode is arranged and connected with the horizontal electrode, so that the overall inductance of the grounding body is reduced. The invention also discloses a grounding device for reducing the impulse grounding resistance of the grounding body of the power transmission line, which comprises the grounding body, a horizontal electrode, a horizontal return electrode and a needle-shaped conductor, wherein the starting end of the horizontal electrode is connected with the grounding body, the horizontal return electrode is connected with the tail end of the horizontal electrode through a conductor block, and the needle-shaped conductor is arranged around the horizontal return electrode. The impulse grounding resistance is reduced by two modes of simultaneously enhancing the spark effect and weakening the influence of inductance, the lightning resistance level of the power transmission line is improved, and the safe and stable operation of the power transmission line is ensured; the needle-shaped conductor is not directly connected with the horizontal return electrode, so that the electric field intensity near the grounding device is distorted on the premise of not increasing the inductance of the grounding device, and the spark effect is enhanced.
Description
Technical Field
The invention belongs to the field of power transmission line grounding, and particularly relates to a method and a device for reducing impulse grounding resistance of a power transmission line grounding body.
Background
The transmission line grounding device is an important part in the lightning protection measures of the transmission line, and whether the line lightning protection can be performed or not is mainly determined by the impact grounding resistance of the transmission line grounding device. The impulse grounding resistance is a resistance value which is shown when the grounding device passes through lightning impulse current. Besides the impact contact resistance influenced by the structure of the grounding device body of the power transmission line, the impact grounding resistance is also influenced by two factors of spark effect and inductance; among them, the spark effect reduces the impulse grounding resistance, and the inductance influence increases the impulse grounding resistance. Currently, some grounding device configurations have emerged to reduce impulse grounding resistance by enhancing the spark effect, while few grounding devices reduce impulse grounding resistance by attenuating the inductive effect. Chinese patent CN204632938U, a grounding device with multiple current spreading arms for wind turbine generators, sets 4 horizontal ray electrodes on an annular grounding body, and sets 3 outlet terminal electrodes on the horizontal ray electrodes to reduce impulse grounding resistance, however, this method will increase inductance influence. Chinese patent CN106451030A, a device and method for reducing ground net impulse grounding resistance, discloses a device for reducing ground net impulse grounding resistance, wherein at least one spark-induced burr conductor is arranged on a horizontal grounding conductor, so that the soil is more likely to be punctured, and the spark effect is very significant. This method reduces the ground resistance by increasing the spark effect, but this method is easy to cause an increase in the inductance effect by providing the spark plug conductor connected to the ground conductor, and to some extent, reduces the resistance reduction effect. Chinese patent publication No. CN204696252U, "a dendritic grounding electrode", discloses a dendritic grounding electrode, which includes an annular grounding body, and four horizontal ray electrodes are disposed on the annular grounding body. The structure can effectively improve the impact characteristic of the grounding body and reduce the impact grounding resistance; but this method cannot reduce the inductive effect.
Disclosure of Invention
The invention aims to solve the technical problems that the existing grounding device or method for reducing the impulse grounding resistance of the power transmission line only reduces the impulse grounding resistance by enhancing the spark effect, cannot reduce the inductance influence of the grounding device, and influences the resistance reduction effect of the grounding device.
The invention aims to solve the problems and provides a method and a device for reducing impulse grounding resistance of a grounding body of a power transmission line.
The technical scheme of the invention is a method for reducing the impulse grounding resistance of the grounding body of the power transmission line, which comprises the following steps,
step 1: arranging a horizontal electrode around the grounding body;
step 2: the unevenness of an electric field near the horizontal electrode is increased, and the spark effect is enhanced;
and step 3: and a horizontal return electrode is arranged and connected with the horizontal electrode, so that the overall inductance of the grounding body is reduced.
Further, in step 1, a horizontal ray electrode is adopted as the horizontal electrode.
Further, in step 2, the electric field intensity near the grounding body is distorted by providing a needle-like conductor near the horizontal electrode;
the grounding device adopting the method for reducing the impulse grounding resistance of the grounding body of the power transmission line comprises the grounding body, a horizontal electrode, a horizontal return electrode, an insulating layer and needle-shaped conductors, wherein the starting end of the horizontal electrode is connected with the grounding body, the horizontal return electrode is arranged under the horizontal electrode, the horizontal return electrode is connected with the tail end of the horizontal electrode through a conductor block, the insulating layer is arranged between the horizontal electrode and the horizontal return electrode, and the needle-shaped conductors are uniformly arranged under the horizontal return electrode.
Further, the distance between the horizontal electrode and the horizontal return electrode is 2-5 mm.
Furthermore, the thickness of the insulating layer is 3-5 times of the width of the horizontal electrode, and the thickness of the insulating layer is 0.5-1 mm smaller than the distance between the horizontal electrode and the horizontal reflux electrode.
Further, the distance between the needle-shaped conductor and the horizontal return electrode is 1-3 mm.
Further, the needle-shaped conductor has a diameter of 0.2 to 0.5 mm.
Furthermore, the lengths of the insulating layer, the horizontal electrode and the horizontal return electrode are equal.
Compared with the prior art, the invention has the advantages that the impulse grounding resistance is reduced by simultaneously enhancing the spark effect and weakening the influence of inductance, the lightning resistance level of the power transmission line is improved, and the safe and stable operation of the power transmission line is ensured; meanwhile, the needle-shaped conductor for increasing the spark effect is not directly connected with the horizontal return electrode, so that the electric field intensity near the grounding device can be distorted on the premise of not increasing the inductance of the grounding device, and the spark effect is enhanced.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a flow chart of a method for reducing impulse grounding resistance of a power transmission line grounding body.
Fig. 2 is a schematic structural diagram of a grounding device for reducing impulse grounding resistance of a power transmission line grounding body.
Description of reference numerals: the grounding body 1, the horizontal ray electrode 2, the horizontal return electrode 3, the conductor block 4, the insulating layer 5 and the needle-shaped conductor 6.
Detailed Description
As shown in fig. 1, the method for reducing the impulse grounding resistance of the grounding body of the power transmission line comprises the following steps,
step 1: arranging a horizontal electrode around the grounding body;
step 2: the unevenness of an electric field near the horizontal electrode is increased, and the spark effect is enhanced;
and step 3: and a horizontal return electrode is arranged and connected with the horizontal electrode, so that the overall inductance of the grounding body is reduced.
As shown in fig. 2, the grounding device adopting the method for reducing the impulse grounding resistance of the grounding body of the power transmission line comprises a square grounding body 1, a horizontal ray electrode 2, a horizontal return electrode 3 and a needle-shaped conductor 6, wherein the horizontal return electrode 3 is arranged under the horizontal ray electrode 2, the horizontal return electrode 3 is connected with the tail end of the horizontal ray electrode 2 through a conductor block 4, and the needle-shaped conductor 6 is arranged around the horizontal return electrode 3. The 4 horizontal ray electrodes 2 are respectively connected to 4 corners of the grounding body 1.
The spacing between the horizontal radiation electrode 2 and the horizontal return electrode 3 is 5 mm.
An insulating layer 5 is provided between the horizontal radiation electrode 2 and the horizontal return electrode 3.
An insulating layer 5 is provided between the horizontal radiation electrode 2 and the horizontal return electrode 3, the width of the insulating layer 5 is 3 times the width of the horizontal electrode, and the thickness of the insulating layer 5 is 4.5 mm.
The distance between the needle-like conductor 6 and the horizontal return electrode 3 was 3 mm.
The needle-like conductor 6 has a diameter of 0.5 mm.
The insulating layer 5, the horizontal ray electrode 2 and the horizontal return electrode 3 are equal in length.
Claims (7)
1. The method for reducing the impulse grounding resistance of the grounding body of the power transmission line is characterized by comprising the following steps,
step 1: arranging a horizontal electrode around the grounding body;
step 2: the needle-shaped conductor is arranged near the horizontal electrode, so that the electric field intensity near the grounding body is distorted, the unevenness of the electric field near the horizontal electrode is increased, and the spark effect is enhanced;
and step 3: and a horizontal return electrode is arranged and connected with the horizontal electrode, so that the overall inductance of the grounding body is reduced.
2. The method for reducing the impulse grounding resistance of the grounding body of the power transmission line according to claim 1, wherein in the step 1, the horizontal electrode is a horizontal ray electrode.
3. The grounding device of the method for reducing the impulse grounding resistance of the grounding body of the power transmission line according to any one of claims 1 to 2, comprising a grounding body, a horizontal electrode, a horizontal return electrode, an insulating layer and a needle-shaped conductor, wherein the starting end of the horizontal electrode is connected with the grounding body, the horizontal return electrode is arranged right below the horizontal electrode, the horizontal return electrode is connected with the tail end of the horizontal electrode through a conductor block, the insulating layer is arranged between the horizontal electrode and the horizontal return electrode, and the needle-shaped conductor is uniformly arranged below the horizontal return electrode; the distance between the needle-shaped conductor and the horizontal reflux electrode is 1-3 mm.
4. The grounding device of the method for reducing the impulse grounding resistance of the grounding body of the power transmission line as claimed in claim 3, wherein the distance between the horizontal electrode and the horizontal return electrode is 2-5 mm.
5. The grounding device of the method for reducing the impulse grounding resistance of the grounding body of the power transmission line as claimed in claim 3, wherein the width of the insulating layer is 3-5 times of the width of the horizontal electrode, and the thickness of the insulating layer is 0.5-1 mm smaller than the distance between the horizontal electrode and the horizontal return electrode.
6. The grounding device of the method for reducing the impulse grounding resistance of the grounding body of the power transmission line as claimed in claim 3, wherein the needle-shaped conductor has a diameter of 0.2-0.5 mm.
7. The grounding device of claim 3 wherein the insulating layer, the horizontal electrode and the horizontal return electrode are of equal length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910717850.6A CN110444918B (en) | 2019-08-05 | 2019-08-05 | Method and device for reducing impulse grounding resistance of power transmission line grounding body |
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| CN201910717850.6A CN110444918B (en) | 2019-08-05 | 2019-08-05 | Method and device for reducing impulse grounding resistance of power transmission line grounding body |
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| CN110444918A CN110444918A (en) | 2019-11-12 |
| CN110444918B true CN110444918B (en) | 2021-01-26 |
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| CN201910717850.6A Active CN110444918B (en) | 2019-08-05 | 2019-08-05 | Method and device for reducing impulse grounding resistance of power transmission line grounding body |
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| CN114824846B (en) * | 2022-05-19 | 2022-12-02 | 湖南经研电力设计有限公司 | Short conductor-based power transmission pole tower grounding method |
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| JP4954250B2 (en) * | 2008-09-12 | 2012-06-13 | 中国電力株式会社 | Ground electrode |
| CN103474791A (en) * | 2013-09-29 | 2013-12-25 | 国家电网公司 | Radial grounding device with impact impedance reducing function |
| CN207517911U (en) * | 2017-12-20 | 2018-06-19 | 湖北继扬电力科技有限公司 | Multi-pin hollow horizontal grounding body |
| CN109638483A (en) * | 2019-01-24 | 2019-04-16 | 贵州电网有限责任公司 | A kind of novel tree root shape structure spark thorn |
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Application publication date: 20191112 Assignee: Hubei Feiou Commercial Management Co.,Ltd. Assignor: CHINA THREE GORGES University Contract record no.: X2023980045280 Denomination of invention: Method and device for reducing impulse grounding resistance of grounding electrodes in transmission lines Granted publication date: 20210126 License type: Common License Record date: 20231102 |
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Effective date of registration: 20240130 Address after: 325000, No. 988 Lingzhan Road, Oujiangkou Industrial Agglomeration Zone, Wenzhou City, Zhejiang Province Patentee after: Chentong Intelligent Electrical Co.,Ltd. Country or region after: China Address before: 443002 No. 8, University Road, Xiling District, Yichang, Hubei Patentee before: CHINA THREE GORGES University Country or region before: China |
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