CN106451030A - Device and method for reducing grounding resistance of grounding grid - Google Patents
Device and method for reducing grounding resistance of grounding grid Download PDFInfo
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- CN106451030A CN106451030A CN201611089417.5A CN201611089417A CN106451030A CN 106451030 A CN106451030 A CN 106451030A CN 201611089417 A CN201611089417 A CN 201611089417A CN 106451030 A CN106451030 A CN 106451030A
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- Prior art keywords
- conductor
- spark
- horizontal grounding
- grounding conductor
- thorn
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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
- H01R43/26—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for engaging or disengaging the two parts of a coupling device
Abstract
The invention discloses a device for reducing grounding resistance of grounding grid. The device comprises at least one horizontal grounding conductor which is fixed at the bottom of the tower. The horizontal grounding conductor is provided with at least one spark thorn conductor which is fixed between the middle part of the horizontal grounding conductor and the impingement current injection point of the horizontal grounding conductor. By setting the spark thron conductor at the front middle of the impingement current injection point near the horizontal grounding conductor, a large part of the current flow of the injection point will flow to the spark thorn conductor, so that the equivalent radius of the spark effect of the spark conductor is enlarged, the soil is more prone to breakdown, and the spark effect is very significant, which, at the same time, has a great influence on the current distribution of the horizontal grounding conductor, so that the resistance value of the grounding resistance is reduced, and the resistance reduction effect is remarkable.
Description
Technical field
The invention belongs to power system Lightning protection field is and in particular to a kind of reduction earth mat impulse earthed resistance
Device and method.
Background technology
The grounding device of transmission line of electricity is to safeguard power system security reliability service, ensure electrical equipment and operations staff's peace
Full basic guarantee and important measures.The grounding body with good impact characteristics can provide effectively protection for transmission line of electricity, from
And avoiding because thunderbolt causes power outage, the safe operation to power system and power supply reliability are respectively provided with highly important
Meaning.
Development with China's electrical network and the raising of stability of power system, in all electric power system faults, by thunder
Hitting the accident ratio causing is in increase trend.When thunder and lightning hits circuit, if the impulse earthed resistance of grounding body is higher, meeting exists
Line insulator string two ends form higher dangerous voltage, and this brings threat not only to the personal safety of operation of power networks personnel, and
And electrical equipment can be destroyed, or even cause more serious accident.Due to the restriction of technical conditions, the power system ground connection of early stage sets
Meter have ignored the impact characteristics of grounding body and only focuses on its power frequency characteristic.For a long time, the design considerationss code of tower grounding body
《The ground connection of alternating-current electric device》（DL/T 621-1997）, in code, the basic principle of grounding design is by power frequency earthing resistance
It is considered as impulse earthed resistance with the product of impact coefficient, the impact characteristics of the lower grounding device of lightning current effect are described with this.But,
Under lightning current effect, accurately saying of tower grounding body impact property of reflection be impulse earthed resistance, rather than power-frequency earthing
Resistance.In order to avoid the generation of accident, improve the impulse grounding characteristic of grounding body, the optimization that docking geotexture carries out system sets
Meter is very necessary.
Grounding device, in the presence of dash current, can produce transient electromagnetic field, about near the soil of grounding body
Electric field intensity if it exceeds the critical breakdown strength of soil, then can produce spark in the soil near the region of earth conductor
Electric discharge, soil is breakdown.Spark discharge is formed such that the voltage drop near grounding body greatly reduces, and the size of grounding body seems
Increased, thus reducing Transient grounding resistance, here it is spark effect.
In prior art, the method reducing earth mat impulse earthed resistance is mainly had expansion grounded screen and is connect using annular concentration
Ground mode etc..For single horizontal grounding body, increase embedded earth conductor quantity or length can effectively reduce power-frequency earthing
Resistance, but after conductor length rises to certain value（This length impacts effective length for grounding body）, with ground connection body length
Increase, its power frequency earthing resistance still persistently reduces, and impulse earthed resistance is then maintained a steady state value and do not continue to reduce,
Impulse earthed resistance also can increase with the length of additional Grounding Grids and reduce, and finally tend towards stability, Additional vertical grounding body
Increase, impulse earthed resistance reduces；But Grounding Grids are excessive, the screen effect between grounding body substantially, can hinder impact to connect
The reduction of ground resistance.For this reason, a kind of system and method for invention reduction earth mat impulse earthed resistance are steady to the safety of transmission line of electricity
Surely run significant.
Content of the invention
For solving above-mentioned technical problem, the invention provides a kind of device reducing earth mat impulse earthed resistance, it includes
It is fixed at least one horizontal grounding conductor of shaft tower bottom, described horizontal grounding conductor is provided with least one spark thorn and leads
Body, described spark pierces conductor and is fixed on the middle part of described horizontal grounding conductor and the dash current injection of described horizontal grounding conductor
Between point.
Further, the middle part of described spark thorn conductor is fixed on described horizontal grounding conductor, and described spark pierces conductor
For symmetric form spark thorn.
Further, the distance between dash current decanting point of described symmetric form spark thorn and described horizontal grounding conductor
For the length of described horizontal grounding conductor 10% ~ 15%.
Further, one end of described spark thorn conductor is fixed on described horizontal grounding conductor, and described spark pierces conductor
With the distance between the dash current decanting point of described horizontal grounding conductor for the length of described horizontal grounding conductor 30% ~
35%.
Further, the length that described spark pierces conductor is the 10% ~ 15% of the length of described horizontal grounding conductor.
Further, described spark thorn conductor is located in same level with described horizontal grounding conductor.
Beneficial effects of the present invention at least include：By before in the dash current decanting point of horizontal grounding conductor
Portion's setting spark thorn conductor, during excessively stream can by current distributing a big chunk of beam point to spark thorn conductor so that spark
The equivalent redius of the spark effect of thorn conductor become big, and soil is easier to puncture, and spark effect is very notable.Simultaneously to level
The CURRENT DISTRIBUTION impact of earth conductor is very big, and then makes the resistance decrease of impulse earthed resistance a lot, and resistance reducing effect is very notable.
And the increase of the distance apart from beam point for the fixed position of conductor is pierced with spark, the shunting that spark pierces on conductor tapers into,
Make spark effect also more and more inconspicuous, the impact to end grounding body CURRENT DISTRIBUTION also diminishes so that resistance reducing effect is deteriorated,
Therefore spark pierces the middle afterbody that conductor should not be fixed on horizontal grounding conductor, and the present invention passes through the close note in horizontal grounding conductor
At flow point, setting spark thorn conductor, reduces earth mat impulse earthed resistance, resistance reducing effect is notable.
On the other hand, the present invention also provides a kind of method reducing earth mat impulse earthed resistance, including step：Level is connect
One end of earthed conductor is fixed on shaft tower Bottom ground on the net, so that horizontal grounding conductor is stretched out in aplysia punctata；In horizontal grounding
Spark thorn conductor is installed between the dash current decanting point of the middle part of conductor and horizontal grounding conductor；Spark is pierced the length of conductor
Be set to horizontal grounding conductor length 10% ~ 15%.
Further, when spark thorn conductor is the single side type spark thorn being fixed on horizontal grounding conductor side, make spark
The distance between dash current decanting point of thorn conductor and described horizontal grounding conductor is the length of described horizontal grounding conductor
30%~35%.
Further, when spark thorn conductor is the symmetric form spark thorn being symmetrically fixed on horizontal grounding conductor both sides, make
Spark pierces the length for described horizontal grounding conductor for the distance between the dash current decanting point of conductor and described horizontal grounding conductor
The 10% ~ 15% of degree.
Brief description
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, will make to required in embodiment description below
Accompanying drawing be briefly described it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of general structure schematic diagram of the device reducing earth mat impulse earthed resistance of the present invention.
Fig. 2 is the schematic diagram that unilateral setting spark pierces conductor.
Fig. 3 is to be symmetrical arranged the schematic diagram that spark pierces conductor.
Fig. 4 does not set, for simulation experiment, the shaft tower earth mat structure chart that spark pierces conductor.
Fig. 5 arranges, for simulation experiment, the shaft tower earth mat structure chart that spark pierces conductor.
Fig. 6 is a kind of flow chart of the method reducing earth mat impulse earthed resistance.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Refer to shown in Fig. 1 ~ 5, the invention provides a kind of device reducing earth mat impulse earthed resistance, it includes fixing
In at least one horizontal grounding conductor 2 of shaft tower 1 bottom, horizontal grounding conductor 2 is provided with least one spark thorn conductor 3,
Spark thorn conductor 3 is fixed between the middle part of horizontal grounding conductor 2 and the dash current decanting point 4 of horizontal grounding conductor 2.
Specifically, spark is arranged by the middle front part in the dash current decanting point 4 close to horizontal grounding conductor 3 and pierce conductor
3, current distributing a big chunk of beam point to spark can be pierced on conductor 3 so that spark pierces the spark effect of conductor 3 during excessively stream
The equivalent redius answered become big, and soil is easier to puncture, and spark effect is very notable.Electricity to horizontal grounding conductor 2 simultaneously
Flow distribution impact is very big, and then makes the resistance decrease of impulse earthed resistance a lot, and resistance reducing effect is very notable.And with spark thorn
The increase of the distance apart from beam point for the fixed position of conductor 3, the shunting that spark pierces on conductor 3 tapers into so that spark is imitated
Should be also more and more inconspicuous, the impact to end grounding body CURRENT DISTRIBUTION also diminishes so that resistance reducing effect is deteriorated, therefore spark thorn
Conductor 3 should not be fixed on the middle afterbody of horizontal grounding conductor 2, and the present invention passes through at the close beam point of horizontal grounding conductor 2
Setting spark thorn conductor 3, reduces earth mat impulse earthed resistance, resistance reducing effect is notable.
The major part reducing impulse earthed resistance is spark thorn conductor 3, reduces rushing of grounded screen by " end effect "
Hit earth resistance, rationally the distance of setting spark thorn conductor 3, position and number can play " spark effect " to reduce punching further
Hit earth resistance.
Improve as one of which, the middle part that spark pierces conductor 3 is fixed on horizontal grounding conductor 2, spark thorn conductor 3 is
Symmetric form spark pierces.In the present embodiment, symmetric form spark thorn and the dash current decanting point 4 of horizontal grounding conductor 2 between away from
From the length for horizontal grounding conductor 2 10% ~ 15%.
The spark of bilateral symmetry setting pierces the resistance reducing effect of conductor 3 with the increase of fixed position and the distance of beam point
Present downward trend, be usually in discharge process the reason there is this phenomenon, the dispersibility of grounding body spark effect with
And Potential distribution that the dispersibility of CURRENT DISTRIBUTION result on each section of conductor is uneven, causes very strong local spark effect, because
This, need the spacing between suitable control symmetric form spark thorn and beam point.
As one of which implementation, one end that spark pierces conductor 3 is fixed on horizontal grounding conductor 2, now spark
Thorn conductor 3 pierces for single side type spark, and in the present embodiment, spark pierces the dash current decanting point 4 of conductor 3 and horizontal grounding conductor 2
The distance between for horizontal grounding conductor 2 length 30% ~ 35%.
Wherein, spark pierces the clout that conductor 3 can be adopted as horizontal grounding conductor 2 in implementation process, by crimp
Or crimp rings are linked together with horizontal grounding conductor 2, spark thorn conductor 3 is located in same level with horizontal grounding conductor 2.
Further, the length that spark pierces conductor 3 is the 10% ~ 15% of the length of horizontal grounding conductor 2, in the present embodiment,
It is preferably the fixing point of 12% length.
In the present embodiment, as shown in Figures 4 and 5, pierce and be with the graphite-based flexible ground body of a diameter of 28mm and graphite spark
Example, iterates to calculate its impulse earthed resistance by CDEGS simulation software, illustrates the resistance reducing effect of graphite spark thorn.Wherein, numerical value
Calculate using typical 220kV iron tower of power transmission line grounded screen, system of laying is square frame band ray, the square frame length of side is 10m, and corner is penetrated
Line extension 12m, buried depth 0.8m, along frame corner beam, as shown in Figure 4.Set up phantom from a beam pole with
Extension ray bilateral symmetry adds the mode that spark pierces conductor, as shown in Figure 5.In Fig. 4, a is shaft tower earth mat, and b is beam point, figure
In 5, a is shaft tower earth mat, and b is beam point, and c is newly-increased bilateral symmetry graphite spark thorn.In order to verify bilateral symmetry interpolation L=
The resistance reducing effect of the spark thorn of 10m length, the amplitude of lightning current selects 50kA, and waveform adopts the standard lightning current wave of 2.6/50 μ s
Shape, soil is set to uniform soil layer, and its resistivity is set to 500 Ω m, and shaft tower earth mat selects Φ 28mm soft graphite to be combined ground material
Material.
By using the HIFREQ high-frequency model in CDEGS software, unit excitation under different frequency can be calculated and produced
Impedance, be impact impedance frequency domain value under this excitation.Using the equivalent redius iterative algorithm pair considering under shock spark effect
The impulse earthed resistance of each transmission tower phantom is calculated accordingly, the shaft tower impulse grounding calculating according to Fig. 4
Resistance is 43.05 Ω, and the Tower Impulse Grounding Resistance calculating according to Fig. 5 is 41.69 Ω, has certain resistance reducing effect.Shaft tower
The degree of spark effect assume downward trend with the increase of soil resistivity, in the case of low soil resistivity, add
Plus short circuit earthed conductor consider spark effects when, for shaft tower current potential reduction than the high electric resistance of soil under same case
The effect of rate will be got well.
On the other hand, as shown in fig. 6, the present invention also provides a kind of method reducing earth mat impulse earthed resistance, it is suitable for
Using aforementioned means, the method specifically includes following steps：S1：One end of horizontal grounding conductor is fixed on shaft tower Bottom ground
On the net, horizontal grounding conductor is made to stretch out in aplysia punctata；S2：In rushing of the middle part of horizontal grounding conductor and horizontal grounding conductor
Hit and spark thorn conductor is installed between Current injection points；S3：The length that spark is pierced conductor is set to the length of horizontal grounding conductor
10%~15%.
Further, when spark thorn conductor is the single side type spark thorn being fixed on horizontal grounding conductor side, above-mentioned side
Method also includes：Spark is made to pierce the distance between dash current decanting point of conductor and horizontal grounding conductor for horizontal grounding conductor
The 30% ~ 35% of length.
Further, when spark thorn conductor is the symmetric form spark thorn being symmetrically fixed on horizontal grounding conductor both sides, on
Method of stating also includes：Make spark pierce the distance between conductor and dash current decanting point of horizontal grounding conductor to lead for horizontal grounding
The 10% ~ 15% of the length of body, in the present embodiment, the fixing point of preferably 12% length.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned enforcement
Example, all technical schemes belonging under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
Should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of device reducing earth mat impulse earthed resistance, leads including at least one horizontal grounding being fixed on shaft tower bottom
Body it is characterised in that：At least one spark thorn conductor is provided with described horizontal grounding conductor, described spark thorn conductor is fixed on
Between the dash current decanting point of the middle part of described horizontal grounding conductor and described horizontal grounding conductor.
2. according to claim 1 a kind of reduce earth mat impulse earthed resistance device it is characterised in that：Described spark thorn
The middle part of conductor is fixed on described horizontal grounding conductor, and described spark thorn conductor pierces for symmetric form spark.
3. according to claim 2 a kind of reduce earth mat impulse earthed resistance device it is characterised in that：Described symmetric form
The distance between dash current decanting point of spark thorn and described horizontal grounding conductor is the length of described horizontal grounding conductor
10%~15%.
4. according to claim 1 a kind of reduce earth mat impulse earthed resistance device it is characterised in that：Described spark thorn
One end of conductor is fixed on described horizontal grounding conductor, and described spark pierces the dash current of conductor and described horizontal grounding conductor
The distance between decanting point is the 30% ~ 35% of the length of described horizontal grounding conductor.
5. according to claim 5 a kind of reduce earth mat impulse earthed resistance device it is characterised in that：Described spark thorn
The length of conductor is the 10% ~ 15% of the length of described horizontal grounding conductor.
6. according to claim 1 a kind of reduce earth mat impulse earthed resistance device it is characterised in that：Described spark thorn
Conductor is located in same level with described horizontal grounding conductor.
7. a kind of method reducing earth mat impulse earthed resistance is it is characterised in that include step：
One end of horizontal grounding conductor is fixed on shaft tower Bottom ground on the net, makes horizontal grounding conductor be in aplysia punctata to extension
Stretch；
Spark thorn conductor is installed between the dash current decanting point of the middle part of horizontal grounding conductor and horizontal grounding conductor；
The length that spark is pierced conductor is set to the 10% ~ 15% of the length of horizontal grounding conductor.
8. a kind of method reducing earth mat impulse earthed resistance according to claim 8 is it is characterised in that lead when spark pierces
When body is the single side type spark thorn being fixed on horizontal grounding conductor side, spark is made to pierce rushing of conductor and described horizontal grounding conductor
Hit the 30% ~ 35% of the length that the distance between Current injection points are described horizontal grounding conductor.
9. a kind of method reducing earth mat impulse earthed resistance according to claim 8 is it is characterised in that lead when spark pierces
When body is the symmetric form spark thorn being symmetrically fixed on horizontal grounding conductor both sides, spark is made to pierce conductor and described horizontal grounding conductor
The distance between dash current decanting point be the 10% ~ 15% of the length of described horizontal grounding conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611089417.5A CN106451030A (en) | 2016-12-01 | 2016-12-01 | Device and method for reducing grounding resistance of grounding grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611089417.5A CN106451030A (en) | 2016-12-01 | 2016-12-01 | Device and method for reducing grounding resistance of grounding grid |
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| CN106451030A true CN106451030A (en) | 2017-02-22 |
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| CN201611089417.5A Pending CN106451030A (en) | 2016-12-01 | 2016-12-01 | Device and method for reducing grounding resistance of grounding grid |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110308333A (en) * | 2019-08-12 | 2019-10-08 | 广东电网有限责任公司 | A kind of grounded screen resistance reducing effect test device and method |
| CN110895300A (en) * | 2019-10-12 | 2020-03-20 | 国网安徽省电力有限公司经济技术研究院 | Lightning protection performance analysis method for graphite grounding device of power transmission line tower |
| CN111541122A (en) * | 2020-05-14 | 2020-08-14 | 国网湖北省电力有限公司十堰供电公司 | Grounding construction method for graphite-based flexible grounding material tower |
| CN111541121A (en) * | 2020-05-14 | 2020-08-14 | 国网湖北省电力有限公司十堰供电公司 | Method for reducing impact grounding impedance of power transmission line tower |
| CN111740243A (en) * | 2020-07-13 | 2020-10-02 | 河南四达电力设备股份有限公司 | Grounding device with spark plug |
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| CN103474791A (en) * | 2013-09-29 | 2013-12-25 | 国家电网公司 | Radial grounding device with impact impedance reducing function |
| KR101358916B1 (en) * | 2013-10-15 | 2014-02-06 | 선광엘티아이(주) | Ground rod having induction discharge plate |
| CN203456602U (en) * | 2013-09-29 | 2014-02-26 | 国家电网公司 | Radial grounding device capable of reducing impulse grounding impedance |
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| CN202772276U (en) * | 2012-09-05 | 2013-03-06 | 韶关市擎能设计有限公司 | Pole-tower lightning protection grounding device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110308333A (en) * | 2019-08-12 | 2019-10-08 | 广东电网有限责任公司 | A kind of grounded screen resistance reducing effect test device and method |
| CN110895300A (en) * | 2019-10-12 | 2020-03-20 | 国网安徽省电力有限公司经济技术研究院 | Lightning protection performance analysis method for graphite grounding device of power transmission line tower |
| CN111541122A (en) * | 2020-05-14 | 2020-08-14 | 国网湖北省电力有限公司十堰供电公司 | Grounding construction method for graphite-based flexible grounding material tower |
| CN111541121A (en) * | 2020-05-14 | 2020-08-14 | 国网湖北省电力有限公司十堰供电公司 | Method for reducing impact grounding impedance of power transmission line tower |
| CN111740243A (en) * | 2020-07-13 | 2020-10-02 | 河南四达电力设备股份有限公司 | Grounding device with spark plug |
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