CN203423263U - Grounding device of reducing power transmission line grounding resistance - Google Patents

Grounding device of reducing power transmission line grounding resistance Download PDF

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Publication number
CN203423263U
CN203423263U CN201320358020.7U CN201320358020U CN203423263U CN 203423263 U CN203423263 U CN 203423263U CN 201320358020 U CN201320358020 U CN 201320358020U CN 203423263 U CN203423263 U CN 203423263U
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CN
China
Prior art keywords
grounding
transmission line
resistance
power transmission
earth
Prior art date
Application number
CN201320358020.7U
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Chinese (zh)
Inventor
魏文伟
邓勇
秦伟
张伟
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四川省电力公司内江电业局
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Priority to CN201320358020.7U priority Critical patent/CN203423263U/en
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Publication of CN203423263U publication Critical patent/CN203423263U/en

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Abstract

The utility model relates to a grounding device of reducing a power transmission line grounding resistance. The grounding device of reducing the power transmission line grounding resistance includes a grounding downlead of a power transmission line tower. The grounding device of reducing the power transmission line grounding resistance is characterized by also comprising a grounding ring and a plurality of parallel grounding rods which are arranged in the soil; one end of the grounding rod is connected with the grounding ring, and the other end of the grounding rod is a free end; the grounding rods are outwards and downwards arranged around one side of the grounding ring in a divergent manner; the lower end of the grounding downlead is connected with the grounding ring; and the grounding ring is sheathed on the power transmission line tower. Because the plurality of parallel grounding rods are used as a grounding body, when the grounding resistance of one grounding rod is R1, the total grounding resistance of n grounding rods is R = R1 / / R2 / /... / / Rn, so that the entire grounding resistance is greatly reduced. And because a current applied to each grounding rod is decreased, the grounding device is good in diffused current grounding effect and excellent in lightning protection performance. The grounding device of reducing the power transmission line grounding resistance is wide in applicability range, is less affected by the seasonal climate, and is suitable for the power transmission line grounding in the high soil electrical resistivity area.

Description

A kind of earthing device that reduces earth resistance of power transmission line
Technical field
The utility model relates to electrical earth device field, is specifically related to a kind of earthing device that reduces earth resistance of power transmission line.
Background technology
Along with expanding economy, more and more higher to the requirement of transmission line power supply reliability, the development of simultaneous electrical network, the tripping operation that transmission line of lightning strike causes, power outage are also increasing.And in many thunders, soil rate area high, with a varied topography, the rate of failure being caused by transmission line of lightning strike is higher, often bring huge economic loss.
Consideration for ensureing the normal operation of transmission line and personal safety, all should be provided with earthing device under electric power line pole tower, yet from various places transmission line caused by lightning strike situation, the shaft tower that lightning fault occurs is mostly that the earth resistance of transmission line is higher.The higher reason of earth resistance of tower grounding device is many-sided, as higher in soil resistivity in extraneous natural conditions, geological condition is complicated, construction be not its main cause.
In order to reduce the earth resistance of shaft tower, the measure often adopting in engineering mainly comprises the size that increases the ground network area, increase earth electrode, increase earth electrode buried, Down conductor, utilize the methods such as natural grounding substance, soil removal and replacement, employing resistance reducing agent.But above-mentioned existing method, in implementation process, often exists complex structure, complex process, reliability low, and the high problem of cost, has seriously restricted the development of the earthing device of low earth resistance.For example, adopt and increase the ground network area reduction earth mat grounding resistance, increasing to of ground network area is to a certain degree little on the impact of grounding resistance, and has increased the difficulty of construction and the cost of construction; The methods such as the research of new material or compound resistance reducing agent are to reduce earth resistance by improving specific soil, have regional center (RC) sex-limited, and reliability is low and cost is high.
Summary of the invention
The utility model is for the deficiencies in the prior art, propose a kind of earth resistance that reduces transmission line by earth resistance under soil layer, there is the earthing device of the reduction earth resistance of power transmission line of simple in structure, the feature such as cost is low, technique is simple, low-resistance value, high reliability.
The technical solution of the utility model is as follows:
Reduce an earthing device for earth resistance of power transmission line, comprise the down conductor on electric power line pole tower, it is characterized in that: it also comprises the ground loop that is arranged at below soil layer and the earth rod of Duo Gen parallel connection; One end of described earth rod is connected with described ground loop, and the other end is free end, and described earth rod is radiation profiles outward downwards around a side direction of described ground loop; The lower end of described down conductor connects described ground loop, and described ground loop is set on described electric power line pole tower.
The angle of described earth rod and ground loop is 40 °~50 °.
The length of described earth rod is 1m~1.5m.
Described down conductor and described ground loop vertical welding.
Described ground loop is circle, square or polygon.
One end of described earth rod is flat.
Technique effect of the present utility model is as follows:
A kind of earthing device that reduces earth resistance of power transmission line of the present utility model, comprises the down conductor on electric power line pole tower, it is characterized in that: it also comprises the ground loop that is arranged at below soil layer and the earth rod of Duo Gen parallel connection; One end of earth rod is connected with ground loop, and the other end is free end, and earth rod is radiation profiles outward downwards around a side direction of ground loop; The lower end of down conductor connects ground loop, and ground loop is set on electric power line pole tower.Owing to utilizing many earth rod parallel connections as earth electrode, when the earth resistance of an earth rod is R1, total earth resistance of n root earth rod be R=R1//R2//... //Rn, therefore reduces the earth resistance of whole earthing device greatly.And the electric current bearing due to each root earth rod reduces, so the diffusing earthing effect of earthing device is good, lightning protection properties is superior.
Because ground loop is set on shaft tower, many earth rods are radiation profiles centered by shaft tower, and diffusion area is large, higher than the earthing device reliability of a down conductor.Thereby can further strengthen earthing effect, improve the lightning protection of whole transmission line, be particularly suitable for using in the poor environment of edaphic condition.
Further, because ground loop is set on shaft tower, shallow embedding, in soil and by soil fixing, does not contact with basic chassis with shaft tower column, can not affect and measure real earth resistance.The earth resistance of earthing device is determined by the parallel resistance of many earth rods, and the degree of depth of earth rod landfill is darker, and by soil fixing, makes the earth resistance of earthing device stable, affected by seasonal climate less.
Accompanying drawing explanation
Fig. 1 is earthing device structural representation of the present utility model
Fig. 2 is that earthing device of the present utility model uses view
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Specific embodiment described herein is only in order to explain the utility model, and is not used in restriction the utility model.
As shown in Figure 1, earthing device of the present utility model comprises the down conductor on ground loop 1, many earth rods 2 and electric power line pole tower, and earth rod 2 is connected in parallel by ground loop 1.Wherein one end of every earth rod 2 and ground loop 1 weld together, and the other end is free end, and all earth rods 2 are all outwards radiation profiles around ground loop 1 downwards with equal angular, form the profile that is similar to frustum.Ground loop 1 can be made into circle, square or polygon, in the present embodiment, preferably round steel welding is made to a flat ring of circle; The length of every earth rod 2 can determine according to the resistivity of regional condition of construction and soil, the preferred 1m~1.5m of the utility model.For taking into account the degree of depth and the swept area of earth rod 2 landfills, preferably the angle of earth rod 2 and ground loop 1 is 40 °~50 ° left and right.
Because earthing device is that 2 parallel connections of many earth rods are as earth electrode, the earth resistance of an earth rod 2 is R1, the all-in resistance of n root earth rod 2 be R=R1//R2//... //Rn, therefore the earth resistance of whole earthing device reduces greatly, the quantity of earth rod 2 is more, and the earth resistance of whole earthing device is just less.When earth rod 2 reaches some, earth resistance change in resistance is little, but earth rod 2 too much can increase difficulty of construction and cost.In the present embodiment, preferably 12 of the quantity of earth rod 2, are equidistantly divided at ten two as the pad with earth rod 2 one end using ground loop 1.It is that the round steel that 22mm, length are 1m is made that earth rod 2 adopts diameters, in order to increase the bonding area with ground loop, and the preferred flat in one end of earth rod 2 and ground loop 1 welding.
As shown in Figure 2, in use by earthing device shallow embedding of the present utility model in soil, wherein ground loop 1 is set in shaft tower 4 and is positioned at the position of soil layer below 5, earth rod 2 inserts in soil and by soil fixing; More than 5 part of shaft tower 4 soil layers that down conductor 3 upper ends of transmission line are connected to transmission line, the ground loop in soil 1 is connected with shallow embedding in lower end.The preferred down conductor 3 of the present embodiment and ground loop 1 vertical welding.
In the present embodiment, the part of electric power line pole tower 4 soil layers below 5 comprises shaft tower column 41 and basic chassis 42, the common pole and tower foundation that forms support shaft tower 4 of shaft tower column 41 and basic chassis 42, shaft tower column 41 stretches out more than 5 part of soil layer and is more than 5 part of shaft tower 4 soil layers.Shaft tower column 41 and basic chassis 42 are integrated the reinforced concrete structure of building, ground loop 1 is sheathed on shaft tower column 41, after having built shaft tower column 41 and basic chassis 42, remove the mould on shaft tower column 41 and basic chassis 42, then around shaft tower column 41 welding ground loops 1.When earth rod 2 is installed, first in the soil of oblique lower 45 ° of ground loop 1 placement location, hole, for the larger area of rock stratum hardness, use electric drill boring, in rock stratum hardness, less or gap, joint, rock stratum is grown preferably area and also can be adopted and manually beat the mode of cutting a hole and hole, bore dia is 22~25mm, by diameter, be that the earth rod 2 that 22mm, length are 1m is squeezed into 0.8m in hole, expose the plumb joint of 0.2m, finally one end of earth rod 2 flats and ground loop 1 are welded into one.
It should be pointed out that the above embodiment can make those skilled in the art's comprehend the utility model create, and creates but limit never in any form the utility model.Therefore; although this specification is created and is had been described in detail the utility model with reference to drawings and Examples; but; those skilled in the art are to be understood that; still can create and modify or be equal to replacement the utility model; in a word, all do not depart from technical scheme and the improvement thereof of the spirit and scope of the utility model creation, and it all should be encompassed in the utility model and create in the middle of the protection range of patent.

Claims (6)

1. reduce an earthing device for earth resistance of power transmission line, comprise the down conductor on electric power line pole tower, it is characterized in that: it also comprises the ground loop that is arranged at below soil layer and the earth rod of Duo Gen parallel connection; One end of described earth rod is connected with described ground loop, and the other end is free end, and described earth rod is radiation profiles outward downwards around a side direction of described ground loop; The lower end of described down conductor connects described ground loop, and described ground loop is set on described electric power line pole tower.
2. a kind of earthing device that reduces earth resistance of power transmission line as claimed in claim 1, is characterized in that: the angle of described earth rod and ground loop is 40 °~50 °.
3. a kind of earthing device that reduces earth resistance of power transmission line as claimed in claim 1 or 2, is characterized in that: the length of described earth rod is 1m~1.5m.
4. a kind of earthing device that reduces earth resistance of power transmission line as claimed in claim 1, is characterized in that: described down conductor and described ground loop vertical welding.
5. a kind of earthing device that reduces earth resistance of power transmission line as described in claim 1 or 2 or 4, is characterized in that: described ground loop is circle or polygon.
6. a kind of earthing device that reduces earth resistance of power transmission line as described in claim 1 or 2 or 4, is characterized in that: one end of described earth rod is flat.
CN201320358020.7U 2013-06-21 2013-06-21 Grounding device of reducing power transmission line grounding resistance CN203423263U (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104201484A (en) * 2014-09-19 2014-12-10 国家电网公司 No-screw non-welded mesh ground lead
CN104993331A (en) * 2015-07-22 2015-10-21 国家电网公司 Power mesh-type lightning protection grounding line
CN105305357A (en) * 2015-12-10 2016-02-03 国网四川省电力公司巴中供电公司 High tension power line improved lightning protection structure
CN105977656A (en) * 2016-05-13 2016-09-28 国网四川省电力公司电力科学研究院 Multi-metal lightning stroke overvoltage and overcurrent releaser
CN108521031A (en) * 2018-07-03 2018-09-11 国网山东省电力公司惠民县供电公司 A kind of tower grounding device
CN108933341A (en) * 2018-07-03 2018-12-04 国网山东省电力公司惠民县供电公司 A kind of tower grounding device
CN110265800A (en) * 2019-05-21 2019-09-20 中国建筑第八工程局有限公司 Based on the earthing or grounding means and its construction method under the conditions of plate brad supporting

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104201484A (en) * 2014-09-19 2014-12-10 国家电网公司 No-screw non-welded mesh ground lead
CN104993331A (en) * 2015-07-22 2015-10-21 国家电网公司 Power mesh-type lightning protection grounding line
CN105305357A (en) * 2015-12-10 2016-02-03 国网四川省电力公司巴中供电公司 High tension power line improved lightning protection structure
CN105977656A (en) * 2016-05-13 2016-09-28 国网四川省电力公司电力科学研究院 Multi-metal lightning stroke overvoltage and overcurrent releaser
CN105977656B (en) * 2016-05-13 2019-04-16 国网四川省电力公司电力科学研究院 More metal Lightning Over-voltage overcurrent releases
CN108521031A (en) * 2018-07-03 2018-09-11 国网山东省电力公司惠民县供电公司 A kind of tower grounding device
CN108933341A (en) * 2018-07-03 2018-12-04 国网山东省电力公司惠民县供电公司 A kind of tower grounding device
CN108521031B (en) * 2018-07-03 2019-10-11 国网山东省电力公司惠民县供电公司 A kind of tower grounding device
CN110265800A (en) * 2019-05-21 2019-09-20 中国建筑第八工程局有限公司 Based on the earthing or grounding means and its construction method under the conditions of plate brad supporting

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Granted publication date: 20140205

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