CN205543275U - Tower grounding device based on three -dimensional equalizer ring - Google Patents

Abstract

The utility model discloses a tower grounding device based on three -dimensional equalizer ring adopts three -dimensional equalizer ring cooperation friction reducer to constitute and mixes earthing device, including four foundation portions of array arrangement, around each foundation portion, set up the closed circular earthing device who connects to form by earthing conductor, constitute three -dimensional voltage -sharing cylinder, three -dimensional voltage -sharing cylinder cover is peripheral in the foundation portion that corresponds to lay the resistance -lowering material layer on the cross -section of three -dimensional voltage -sharing cylinder upper surface bottom surface under with. The utility model is used for high -tension transmission ground connection field is applicable to the regional limited occasion of ground connection, can realize effectively reducing tower grounding resistance under the circumstances of less area occupied, improves the security performance around the shaft tower simultaneously.

Description

A kind of tower grounding device based on three-dimensional grading ring

Technical field

This utility model relates to high voltage power transmission ground connection field, sets particularly to high-voltage transmission line pole tower ground connection Meter technical field.

Background technology

Along with the raising of transmission line of electricity electric pressure, the increase of transmission capacity, the failed shorted electricity of transmission line of electricity Stream also will increase.Simultaneously because the restriction of land resource, some transmission line of electricity inevitably pass through cities and towns, The place that the population activities such as factory, farmland, even residential block are intensive.The ground connection dress of high-voltage transmission line towers Put general employing horizontal radiation formula artificial earthing pole and carry out fall resistance design, but for above-mentioned area, complete Laying of horizontal grounding pole must pay the biggest financial resource and material resource, and expropriation of land cost is high, and soil excavation limitation is big, These are all the limitations using horizontal radiation earthing pole to reduce pole tower ground resistance.Due to the limitation in space, Many times the grounding device in such place can not be designed according to conventional fall resistance measure and transform, and it connects Earth resistance generally cannot meet regulatory requirements, once circuit, thunderbolt or power frequency short circuit, powerful thunder and lightning occurs When stream or the grounded device of power frequency short circuit current flow into the earth, owing to earth resistance exceeds standard, bar will certainly be caused Tower grounding device earth potential raises, and forms dangerous step voltage and contact voltage, personnel near serious threat Life security, therefore, to such area circuit tower grounding device be optimized design have important Realistic meaning

Utility model content

The purpose of this utility model is to overcome in prior art owing to earth resistance exceeds standard, and causes tower grounding Device earth potential raises, and forms dangerous step voltage and contact voltage, threatens the technology of worker safety Problem, it is provided that a kind of utilize three-dimensional grading ring grounding device that the grounding device of emphasis zone of protection shaft tower is carried out Optimize, can effectively reduce pole tower ground resistance under the conditions of relatively small footprint size, considerably increase shaft tower simultaneously Around equipotential surface area, the personnel near well all pressure effects, reduction that play bear step voltage and contact electricity The tower grounding device based on three-dimensional grading ring of the probability of pressure.

For achieving the above object, this utility model uses following technical scheme: a kind of based on three-dimensional grading ring Tower grounding device, use three-dimensional grading ring to coordinate friction reducer to constitute mixing grounding device, arrange including array Four pole and tower foundation portions of cloth, around each pole and tower foundation portion, are arranged by closing that earth conductor connection forms Cyclization shape grounding device, constitutes solid and all presses cylinder, and three-dimensional all pressures cylinder of holster is at corresponding pole and tower foundation Portion is peripheral, and lays resistance-lowering material layer on the cross section that solid all presses cylinder upper surface and bottom surface.

Feature of the present utility model is the occasion for limited space, can have under the conditions of relatively small footprint size Effect reduces pole tower ground resistance, the horizontal radiation grounding design that contrast is conventional, will reach identical grounding resistance-reducing Effect, in the case of using identical material round steel and identical buried depth, the consumed occupation of land of grading ring type grounding device Area is only about the 65% of horizontal radiation grounding device, reaches to improve the earthing effect of limited space occasion.

Solid all presses cylinder to be made up of galvanized steel bar, is divided into top annulus, bottom annulus and connects top circle Ring, the vertical connector of bottom annulus, top annulus is connected by four vertical connectors with bottom annulus, shape Become closed hoop grounding device.Galvanized steel bar is made three-dimensional cylindric, is centered around around each pole and tower foundation, Depending on its buried depth, annular radii, high visibility concrete condition.

Feature of the present utility model is to lay the friction reducer of respective cross-section around earth conductor, reduces entirety While earth resistance, grounding body surface is formed protection, prevent corrosion.Fall is used at grounding device After resistance material, the conductor radius of grounding body be can effectively increase, grounding resistance-reducing material and grounding body selected Between contact resistance less in the case of, effectively reduce the earth resistance of single unit system, improve transmission line of electricity Lightning protection properties, improves the decay resistance of grounding body simultaneously.

Feature of the present utility model is the closed hoop grounding device connected and composed by earth conductor, can be effective Increase the equipotential surface area on column foot near its circumference ground, make this region inter potential change reduce, effectively increase The effective coverage of ground electrode, reduces the step voltage around ground connection shaft tower and contact voltage, improves power transmission line Line pole tower safety.

This utility model compared with prior art, has the advantage that this utility model connects for high voltage power transmission Field, ground, it is adaptable to the occasion that ground area is limited, effectively drops in the case of may be implemented in less area occupied Low pole tower ground resistance, improves the security performance around shaft tower simultaneously.

Accompanying drawing explanation

Fig. 1 show tower grounding device based on three-dimensional grading ring；

Fig. 2 show tower grounding device top view；

Description of reference numerals: 1-pole and tower foundation portion, 2-solid grading ring, 3-resistance-lowering material layer.

Detailed description of the invention

With detailed description of the invention, content of the present utility model is described in further details below in conjunction with the accompanying drawings.

Embodiment:

Referring to shown in Fig. 1 and Fig. 2, a kind of tower grounding device based on three-dimensional grading ring, including array Four pole and tower foundation portions 1 of arrangement, around each pole and tower foundation portion 1, arrange and are made up of earth conductor connection Closed hoop grounding device, constitute solid and all press cylinder 2, three-dimensional all pressures cylinder 2 is enclosed within the bar of correspondence Tower foundation portion 1 is peripheral, and lays fall resistance material on the cross section that solid all presses cylinder 2 upper surface and bottom surface The bed of material 3.

In the present embodiment, solid all presses cylinder 2 to be made up of galvanized steel bar, is divided into top annulus, bottom Annulus and connection top annulus, the vertical connector of bottom annulus, top annulus hangs down by four with bottom annulus Straight connecting members is connected, and forms closed hoop grounding device.

The resistance reducing effect of three-dimensional grading ring device is carried out explanation of deriving: assume device surrounding soil electricalresistivityρ, Equalized voltage ring construction radius r, grounding device height L, grounding body buried depth h, the fall resistance coefficient of all resistance-lowering materials For k, being processed can be obtained by simplification, the earth resistance of the single column foot of grounding body is:

$R=\frac{k\mathrm{\ρ}}{2\mathrm{\π}(L+h)}\[ln\frac{4(L+h)}{r}-1\]$

The parallel value that grounding resistance is four tower-footing resistances that overhead line structures are final:

R'=η (R_A//R_B//R_C//R_D)

Wherein η is the screening factor of earth conductor, generally between 1.2～1.5.

In the present embodiment, resistance-lowering material layer 3 can use GPF-94 type friction reducer, due to the radius of its material Less, and there is higher water absorption rate, contacting between resistance-lowering material with grounding body can be reduced after a procedure Resistance, also reduces the contact resistance between conductor and soil simultaneously, easily obtains preferable resistance reducing effect. Use GPF-94 to corrode prevented also from grounding body, it is ensured that between grounding body and resistance-lowering material simultaneously Contact resistance keep stable.

In the present embodiment, overhead line structures surrounding soil electricalresistivityρ=1000 Ω m is set, by design discipline Require its earth resistance R≤20 Ω.Design Equalized voltage ring construction radius r=1.3m, grounding device height L=2m, grounding body buried depth h=0.8m, coordinate the GPF-94 friction reducer of fall resistance coefficient k=0.73, take Screening factor η=1.2, available total earth resistance is 19 Europe, meets grounding requirement, under equal conditions, Contrast level radiation the consumed 165m of grounding body²Floor space, three-dimensional the consumed floor space of grading ring device is only For 108m², substantially reduce appropriation of land.

In this utility model, three-dimensional all pressures cylinder 2 can realize making the optimization of column foot surrounding electric field distribution With.In the case of in view of personal security near shaft tower, it is necessary to taking certain measure to reduce has event Step voltage near shaft tower and contact voltage when barrier electric current flows through, and the attached subaerial current potential of transmission line of electricity divides Cloth directly influences the size of touch voltage and step voltage.The three-dimensional grading ring grounding device of contrast and conventional water Keeping flat emitter-base bandgap grading device, under identical thunderbolt surge voltage load condition, the three-dimensional grading ring grounding device of employing can Ground equipotential surface area is made to significantly increase so that column foot peripheral ground current potential is more uniform, reduces in this district The change of territory inter potential, plays and all presses effect, decreases human body and bears the threat of step voltage, improves tower The grounding safety performance that primitive period encloses.

Above-listed detailed description is illustrating for this utility model possible embodiments, and this embodiment is not used To limit the scope of the claims of the present utility model, all equivalences done without departing from this utility model are implemented or change, It is intended to be limited solely by the scope of the claims of this case.

Claims (2)

1. a tower grounding device based on three-dimensional grading ring, it is characterised in that: include the four of array arrangement Individual pole and tower foundation portion (1), around each pole and tower foundation portion (1), setting is made up of earth conductor connection Closed hoop grounding device, constitutes solid and all presses cylinder (2), and solid all presses cylinder (2) to be enclosed within correspondence Pole and tower foundation portion (1) peripheral, and on the cross section that solid all presses cylinder (2) upper surface and bottom surface Lay resistance-lowering material layer (3).

A kind of tower grounding device based on three-dimensional grading ring, it is characterised in that: Solid all presses cylinder (2) to be made up of galvanized steel bar, is divided into top annulus, bottom annulus and connects top circle Ring, the vertical connector of bottom annulus, top annulus is connected by four vertical connectors with bottom annulus, shape Become closed hoop grounding device.