CN111740243A - Grounding device with spark plug - Google Patents
Grounding device with spark plug Download PDFInfo
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- CN111740243A CN111740243A CN202010668794.4A CN202010668794A CN111740243A CN 111740243 A CN111740243 A CN 111740243A CN 202010668794 A CN202010668794 A CN 202010668794A CN 111740243 A CN111740243 A CN 111740243A
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- grounding
- spark
- grounding body
- spark plugs
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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
- 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
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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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Spark Plugs (AREA)
Abstract
The present disclosure discloses a take earthing device of spark thorn includes: the horizontal grounding body comprises a grounding body main body and a plurality of grounding body branches connected with the grounding body main body, a plurality of spark plugs are arranged on each grounding body branch at equal intervals, and an included angle is formed between every two adjacent spark plugs. The shielding effect between the spark plugs can be weakened by designing the spark plugs to be equidistant and at a certain included angle with each other.
Description
Technical Field
The utility model belongs to the technical field of electric power system lightning grounding, concretely relates to take earthing device of spark thorn.
Background
Lightning strikes are an important threat to the safe and reliable operation of electrical power systems. According to the statistical data of the power grid faults in China, the tripping times caused by lightning striking of towers or power transmission lines in the areas with high tripping rates of the power transmission lines account for about 40-60% of the total tripping times of the power transmission lines. The lightning protection level of the power transmission line is improved, and the lightning trip-out rate is reduced, so that the safety and the stability of the operation of the power system are very important. Lightning protection grounding is a key measure for reducing the lightning stroke trip-out rate of a power transmission line, and the reduction of the grounding resistance of a grounding device is important for lightning protection.
For a long time, the basic principle of grounding design is to regard the product of power frequency grounding resistance and impact coefficient as impact grounding resistance, so as to describe the impact characteristic of the grounding device under the action of lightning current. However, the lightning impulse current flows through the grounding device, and the dispersion condition in the ground is relatively complicated, and is related to the structural size of the grounding device, the resistivity of the soil, the buried depth of the grounding device, the amplitude of the impulse current and other factors. Firstly, spark effect and soil nonlinear change exist in lightning strike, a transient electric field is arranged around a grounding body under the action of impact current, the resistivity of the soil changes along with the change of field intensity, when the electric field intensity reaches the initial discharge field intensity of the soil, the soil is punctured to generate spark discharge, and the spark effect generated by the breakdown of the soil causes the reduction of the impact grounding resistance. Secondly, the resistance component of the grounding body resistance under the action of the impulse current is mainly influenced by the resistivity of the material and the skin effect under high frequency. High-frequency currents such as lightning currents or fault currents are often concentrated on the surface layer of the grounding body when flowing through the grounding body, the effective current dissipation area of the grounding body participating in current dissipation is smaller than the sectional area of the grounding body, and the grounding body outside the effective current dissipation area has little effect on the current dissipation, so that the material utilization rate is low. In addition, the larger magnetic permeability of the grounding material not only increases the resistive component due to the skin effect, but also correspondingly increases the inductive reactance value, and the current is restrained from flowing to the far end of the grounding body under the influence of the shielding effect between conductors, so that the grounding resistance is increased.
At present, the main methods for reducing the impact grounding impedance of the grounding device at home and abroad include improving a grounding electrode structure, using a grounding resistance reducing agent to artificially improve soil, adopting deep well grounding and the like. However, with the complex structure of the grounding electrode, the shielding effect and the skin effect are more obvious, so the invention of the grounding device capable of effectively reducing the grounding resistance has important significance for maintaining the safe operation of the power grid.
Disclosure of Invention
Aiming at the defects in the prior art, the purpose of the disclosure is to provide a grounding device with spark plugs, wherein the spark plugs form a certain angle and are fixed at intervals, so that the shielding effect among the spark plugs can be weakened, and the impulse grounding resistance is reduced.
In order to achieve the above purpose, the present disclosure provides the following technical solutions:
a spark-stab carrying ground engaging apparatus, comprising: the horizontal grounding body comprises a grounding body main body and a plurality of grounding body branches connected with the grounding body main body, a plurality of spark plugs are arranged on each grounding body branch at equal intervals, and an included angle is formed between every two adjacent spark plugs.
Preferably, the included angle between the adjacent spark plugs is 120 degrees.
Preferably, the spark plugs are distributed on the grounding body branches from the injection points 1/3 to 7/10.
Preferably, the length of the spark plug is 0.1-0.25 times of the branch of the grounding body.
Preferably, the distance between the spark plugs is 0.9-1.1 times the length of the spark plugs.
Preferably, the horizontal grounding body is made of graphite materials.
The present disclosure also provides a method for reducing impulse resistance, comprising the steps of:
s100: fixing the horizontal grounding body on the ground net to ensure that the branches of the horizontal grounding body extend outwards in a ray shape;
s200: arranging the spark plugs which mutually form an angle of 120 degrees on the horizontal grounding body at equal intervals;
s300: the length of the spark plug is set to be 0.1-0.25 times of the horizontal grounding body branch.
Preferably, in step S200, the spark plug is disposed at 1/3 to 7/10 from the horizontal ground contact fluid injection point.
Preferably, in step S200, the distance between the spark plugs is 0.9-1.1 times the length of the spark plugs.
Compared with the prior art, the beneficial effect that this disclosure brought does:
1. the shielding effect among the spark thorns can be weakened by designing the spark thorns to be at equal intervals and form a certain included angle with each other;
2. the graphite material has the characteristics of unobvious skin effect, low inductance effect and small contact resistance with soil, and has more obvious resistance reduction effect compared with the traditional horizontal grounding body prepared by using a metal material.
Drawings
Fig. 1 is a schematic structural diagram of a grounding device with a spark plug according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a grounding device without a spark plug according to another embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a grounding device with spark plugs arranged in parallel according to another embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a ground resistance versus position curve provided by another embodiment of the present disclosure;
FIG. 5 is a schematic illustration of a spark zone volume versus position plot provided by another embodiment of the present disclosure;
FIG. 6 is a schematic diagram illustrating a variation curve of a spark plug length and a ground resistance according to another embodiment of the present disclosure;
FIG. 7 is a schematic diagram of the electric field distribution at a 0.4m spark gap interval according to another embodiment of the present disclosure;
FIG. 8 is a schematic diagram of the electric field distribution at a 0.1m spark gap interval according to another embodiment of the present disclosure;
fig. 9 is a schematic diagram illustrating a variation curve of the ground resistance and the spark gap interval according to another embodiment of the disclosure.
Detailed Description
Specific embodiments of the present disclosure will be described in detail below with reference to fig. 1 to 9. While specific embodiments of the disclosure are shown in the drawings, it should be understood that the disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present disclosure is to be determined by the terms of the appended claims.
To facilitate an understanding of the embodiments of the present disclosure, the following detailed description is to be considered in conjunction with the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present disclosure.
In one embodiment, as shown in fig. 1, the present disclosure provides a grounding device with a spark plug, comprising: the horizontal grounding body comprises a grounding body main body and a plurality of grounding body branches connected with the grounding body main body, a plurality of spark plugs are arranged on each grounding body branch at equal intervals, and an included angle is formed between every two adjacent spark plugs.
In the embodiment, when larger lightning flows into the ground, the spark plug is additionally provided with the current dispersion channel, most of the current flows into the soil through the spark plug, the local field intensity near the spark plug is increased, the soil is easy to break down, the volume of a spark area is increased, and the impulse grounding resistance is reduced. The influence on the electric conduction effect of the spark plugs is mainly a shielding effect, and the shielding effect comprises the shielding effect between the spark plugs and a horizontal grounding body (the shielding effect means that when an impact current passes through the grounding body to generate spark discharge, spark areas between adjacent grounding bodies or connecting points of the grounding bodies are overlapped, and the flow of the current is hindered). Illustratively, as shown in fig. 1, the main body of the horizontal grounding body is arranged into a square frame, the side length of the square frame is 5cm, the branch of the grounding body connected with the main body is 2cm in length, the buried depth is 0.7m, and the flow is injected along the four corners of the square frame, 3 spark plugs are respectively arranged on each branch of the grounding body, the first spark plug is perpendicular to the branch of the grounding body, the second spark plug is arranged at a certain included angle with the first spark plug, and the third spark plug and the second spark plug are also arranged at the same included angle. It should be noted that, the spark plug is arranged behind the current injection point b, and when a large current flows through the spark plug, a large part of the current at the current injection point b is shunted to the spark plug, so that the equivalent radius of the spark effect of the spark plug is increased, the soil is more likely to be punctured, the spark area is increased, and the spark effect is more obvious.
The technical effects of the present embodiment will be further explained with reference to fig. 2 and 3, in which fig. 2 shows a horizontal grounding body without spark plugs, and fig. 3 shows a horizontal grounding body with spark plugs but with parallel spark plugs. Taking the horizontal grounding body shown in FIG. 1 as an example, the amplitude of the lightning current is set to be 30kA, the waveform adopts a standard lightning current waveform of 2.6/50 mus, the soil is set to be a nonlinear function, and the initial resistivity of the soil is set to be 580 omega m. The impulse grounding resistance is 26.971 omega when no spark plug is arranged (shown in figure 2) through calculation; when the spark plugs are arranged and arranged in parallel (shown in fig. 3), the impulse grounding resistance is 24.749 Ω; when setting up spark thorn and being the certain contained angle between the spark thorn, impulse ground resistance is 22.663 omega, and it is thus clear that this embodiment can effectively reduce impulse ground resistance through being the certain contained angle of design between with adjacent spark thorn.
In another embodiment, the included angle between the adjacent spark plugs is 120 degrees.
In this embodiment, the included angle between the adjacent spark plugs is set to 120 °, so that the intervals between the symmetrically arranged spark plugs are most suitable, otherwise, the spark plugs on different grounding body branches are adjacent or close to each other, which may cause overlapping of spark areas, and affect the weakening effect of the shielding effect.
In another embodiment, the spark plugs are distributed on the grounding body branches from the injection points 1/3 to 7/10.
In this embodiment, as the distance between the spark plug and the current injection point increases, the volume of the spark area increases first and then decreases due to the influence of the end effect and the shielding effect, so that the corresponding impulse grounding resistance decreases first and then increases, and therefore, the spark plug is not suitable for being installed at the current injection point and the tail of the horizontal grounding body. Taking fig. 4 to 5 as an example, in the range of 0.6m to 1.4m, the volume of the spark area and the change of the shielding effect are not obvious, the volume of the spark area reaches the highest value, and the impulse grounding resistance reaches the lowest value, at the moment, the spark plug can effectively play a role of current dispersion, the spark area is enlarged, and the impulse grounding resistance is reduced, and in the area, the resistance reduction rate of the impulse grounding resistance is about 3.56%, therefore, on the basis of fully considering the shielding effect and the end effect, the spark plug is arranged on the branch of the grounding body at a position which is far from the current injection point 1/3-7/10, the impulse grounding resistance of the ground grid can be reduced, and the resistance reduction effect is obvious.
In another embodiment, the length of the spark plug is 0.1-0.25 times the length of the ground body branch.
In the present embodiment, taking fig. 6 as an example, it is assumed that the length of the grounding body branch is 15cm, the grounding resistance is lower when the length of the spark plug is between 2cm and 4cm, and the resistance reduction effect is better when the length is 2cm, that is, the optimal solution of the length of the spark plug is 2cm to 4cm when considering the shielding effect. When the length is shorter or longer, the grounding resistance is higher, and when the length is 1cm, the shielding effect and the inductance effect occupy the dominant positions, and the addition of the spark plugs can not effectively disperse the current. When the length is longer, the shielding effect between the spark plug and the grounding body is dominant, and the addition of the spark plug increases the grounding resistance in consideration of the influence of the contact resistance and the resistance per se. Therefore, when the length of the spark plug is 2-4cm, the resistance reduction effect is best, and the resistance reduction rate can reach 14.8%.
In another embodiment, the distance between adjacent spark plugs is 0.9-1.1 times the length of the spark plug.
In the embodiment, the spark plugs with proper length can effectively reduce the impulse grounding resistance, and the spacing of the spark plugs is very important in consideration of the shielding effect among the spark plugs. In order to avoid the interference of larger current distribution generated by the end part effect of the grounding body on the scattered current of the spark plug, the spark plug is symmetrically arranged in the middle of the branch of the grounding body. As shown in fig. 7, when the distance between the spark plugs is greater than 0.4m, the spark zones formed by the two spark plugs do not overlap, the spark zone between the short conductors with weak shielding effect is increased, and the current dispersion is better. As shown in fig. 8, when the spark gap is 0.1m, the spark zones begin to overlap. As shown in the figure, as the distance between the spark spurs increases, the volume of the spark area also increases, and the increasing trend of the spark area increases first and then slowly, because the shielding effect begins to weaken when the distance is just changed to be smaller, the overlapping part of the spark areas generated by the two spark spurs begins to decrease, the shielding effect begins to weaken when the distance between the spark spurs is larger, the spark area mainly comprising the two spark spurs begins to increase and become slower when the distance reaches the length of the spark spurs, the shielding effect between the spark spurs is weaker when the distance reaches the length of the spark spurs, the volume change of the spark area of the spark spurs is smaller, the volume of the spark area between the spark spurs increases along with the increase of the distance, and the volume of the spark area begins to decrease again when the distance of the spark spur. As can be seen from the analysis of the variation curve of the impulse grounding resistance shown in fig. 9, the impulse grounding resistance gradually decreases with the increase of the interval of the spark plug, and decreases more and more slowly, and finally becomes gentle, and the grounding resistance when the length of the spark plug is 0.5m is lower than the grounding resistance when the length of the spark plug is 0.2m as a whole, because the existence of the spark plug with the effective length increases the current dissipation channel. The impulse grounding resistance is the lowest at a pitch of around 0.5m when the length of the spark plug is 0.5m, and the impulse grounding resistance is the lowest at a pitch of around 0.2m when the length of the spark plug is 0.2m, i.e., when the spark plug interval is substantially equal to the length of the spark plug.
In another embodiment, the horizontal grounding body is made of graphite material.
In this embodiment, compared with the conventional metal material, the graphite material is corrosion-resistant, low in cost, unobvious in skin effect, high in material utilization rate, low in inductance effect, and small in contact resistance with soil, so that the graphite is selected as the manufacturing material of the horizontal grounding body in this embodiment, and has a more obvious resistance reduction effect compared with the conventional horizontal grounding body using the metal material.
In another embodiment, the present disclosure further provides a method for reducing impulse resistance, including the steps of:
s100: fixing the horizontal grounding body on the ground net to ensure that the branches of the horizontal grounding body extend outwards in a ray shape;
s200: arranging the spark plugs which mutually form an angle of 120 degrees on the horizontal grounding body at equal intervals;
s300: the length of the spark plug is set to be 0.1-0.25 times of the horizontal grounding body branch.
The foregoing describes the general principles of the present disclosure in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present disclosure are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present disclosure. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.
Claims (9)
1. A spark-stab carrying ground engaging apparatus, comprising: the horizontal grounding body comprises a grounding body main body and a plurality of grounding body branches connected with the grounding body main body, a plurality of spark plugs are arranged on each grounding body branch at equal intervals, and an included angle is formed between every two adjacent spark plugs.
2. The grounding device as claimed in claim 1, wherein the angle between adjacent spark plugs is preferably 120 °.
3. The grounding device of claim 1, wherein the spark plugs are distributed on the grounding body branches from injection points 1/3 to 7/10.
4. The grounding device of claim 1, wherein the length of the spark plug is 0.1-0.25 times the length of the grounding body branch.
5. The grounding device of claim 1, wherein the sparkplugs have a pitch of 0.9-1.1 times the length of the sparkplugs.
6. The grounding device of claim 1, wherein the horizontal grounding body is made of graphite material.
7. A method of reducing surge resistance of the grounding device of claim 1, comprising the steps of:
s100: fixing the horizontal grounding body on the ground net to ensure that the branches of the horizontal grounding body extend outwards in a ray shape;
s200: arranging the spark plugs which mutually form an angle of 120 degrees on the horizontal grounding body at equal intervals;
s300: the length of the spark plug is set to be 0.1-0.25 times of the horizontal grounding body branch.
8. The method of claim 7, wherein the spark plug is positioned 1/3-7/10 from the horizontal ground body injection point in step S200.
9. The method as claimed in claim 7, wherein the interval of the spark plugs is 0.9-1.1 times the length of the spark plugs in step S200.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010668794.4A CN111740243A (en) | 2020-07-13 | 2020-07-13 | Grounding device with spark plug |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010668794.4A CN111740243A (en) | 2020-07-13 | 2020-07-13 | Grounding device with spark plug |
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| CN111740243A true CN111740243A (en) | 2020-10-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112395750A (en) * | 2020-11-06 | 2021-02-23 | 长沙理工大学 | Method for reducing power frequency step voltage of urban power transmission steel pipe tower grounding device |
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| CN109613340A (en) * | 2019-01-24 | 2019-04-12 | 贵州电网有限责任公司 | A kind of impulse earthed resistance calculation method with spark thorn |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080002056U (en) * | 2006-12-19 | 2008-06-24 | 김귀연 | The grounding arc pin |
| CN103036076A (en) * | 2012-12-25 | 2013-04-10 | 宁波电业局 | Device and method for reducing impulse grounding impedance value |
| CN103474791A (en) * | 2013-09-29 | 2013-12-25 | 国家电网公司 | Radial grounding device with impact impedance reducing function |
| CN204424463U (en) * | 2014-12-29 | 2015-06-24 | 国家电网公司 | A kind of branch is the horizontal grounding objects of the three stage structure of 120 ° |
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| CN112395750A (en) * | 2020-11-06 | 2021-02-23 | 长沙理工大学 | Method for reducing power frequency step voltage of urban power transmission steel pipe tower grounding device |
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Application publication date: 20201002 |