CN202384676U - Grounding net of urban indoor 220kV transformer substation - Google Patents

Grounding net of urban indoor 220kV transformer substation Download PDF

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Publication number
CN202384676U
CN202384676U CN2011205207772U CN201120520777U CN202384676U CN 202384676 U CN202384676 U CN 202384676U CN 2011205207772 U CN2011205207772 U CN 2011205207772U CN 201120520777 U CN201120520777 U CN 201120520777U CN 202384676 U CN202384676 U CN 202384676U
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CN
China
Prior art keywords
transformer station
ground network
horizontal
earth mat
grounding net
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2011205207772U
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Chinese (zh)
Inventor
顾尔重
王宏伟
郭献军
张继军
田俊强
耿建风
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Hennan Electric Power Survey and Design Institute
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Hennan Electric Power Survey and Design Institute
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Priority to CN2011205207772U priority Critical patent/CN202384676U/en
Application granted granted Critical
Publication of CN202384676U publication Critical patent/CN202384676U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model relates to a grounding net of an urban indoor 220kV transformer substation. The grounding net is positioned under each electricity distribution building of the transformer substation. The grounding net comprises a horizontal grounding net I at the height of minus 0.8m, and further comprises a horizontal grounding net II at the height within minus 3m-minus 5m. The horizontal grounding net I and the horizontal grounding net II are connected in parallel to form a horizontal bi-layered grounding net. By adopting the above technical scheme of the grounding net provided by the utility model, the electrical resistivity of the grounding net can be efficiently reduced.

Description

The ground network of the city complete indoor transformer station of 220kV
Technical field
The utility model relates to a kind of design of ground network, specifically relates to the ground network of a kind of city complete indoor transformer station of 220kV.
Background technology
Along with development of city, the urban distribution network pace of construction is accelerated, and increasing down town 220kV transformer station plans and builds.The construction of down town transformer station must adapt to the city around, as to around can not constitute noise and electromagnetic pollution.The occupation of land that reduces transformer station in addition also is the main target of city transformer station.The complete indoor arrangement of the general employing of down town 220kV transformer station is promptly built one or distribution building, two buildings for this reason; 220kV, 110kV power distribution equipment adopt GIS, and 10kV or 35kV adopt switch cubicle; Main transformer, GIS, switch cubicle and other all electric equipments all are arranged in the distribution building.Floor space is significantly smaller than common suburb 220kV transformer station in the city complete indoor 220kV transformer station enclosure wall, generally below 5 ~ 6 mu.The reducing of transformer station's floor space increased the ground network difficulty of design greatly.
According to the regulation of " ground connection of alternating-current electric device " DL/T621-1997, the earth resistance of power plant, electric substation's electric device protective earthing should meet the following requirements in effective grounding and the low resistance earthing system:
1) generally speaking, the earth resistance of earthing device should meet following formula and requires:
R≤2000/I 
In the formula: R---consider the maximum earth resistance of seasonal variations, Ω;
I---calculate usefulness the earthing device of flowing through go into ground short circuit electric current, A.
2) when the earth resistance of earthing device does not meet above-mentioned requirements; Can relatively increase earth resistance through Technological Economy; But must not be greater than 5 Ω; And should meet following requirement: for preventing to shift the harm that current potential causes, guide the facility in the transformer station into, should take quarantine measures to maybe the high potential of ground network being guided into outside the transformer station or with electronegative potential; Consider the influence of DC component of short-circuit current, when the ground network current potential raise, the 3~10kV valve type arrester in power plant, the electric substation not should bear the energy that is invested after should not moving or move; During design ground network, answer the checking computations contact potential difference and stride potential difference.
2. according to the regulation of " power equipment preventive trial rules " DL/T 596-2005, the earth resistance requirement of the power equipment of effectively earthed system is:
R≤2000/I or R≤0.5 Ω (work as I>4000A)
These rules explain in addition, and in high soil resistivity, earth resistance is as by the setting requirement, on Technological Economy, when extremely unreasonable, allow bigger numerical value.But something must be done to so that ground short circuit guarantee to take place, and on this ground network: touch voltage and step voltage all are no more than the numerical value of permission; High potential does not take place to be drawn outer and in electronegative potential draws; 3~10kV valve type arrester is failure to actuate.
Obviously, above two rules for the regulation of earth resistance, " power equipment preventive trial rules " are more strict; Therefore, in design during ground network, the size of earth resistance generally should be followed R≤2000/I or R≤0.5 Ω (work as I>4000A), then should carry out Technological Economy relatively as not satisfying, and take appropriate measures by the rules requirement.
Because indoor station floor space is less, when soil resistivity in transformer station's site scope was big, the Resistance of Grounding Grids that adopts conventional method to design normally can not meet the demands, and something must be done to reduces earth resistance." ground connection of alternating-current electric device " has provided several suggestions to this: 1) when in the power plant, the 2000m of transformer station is during with the interior soil that low resistivity arranged, and can lay the Down conductor utmost point; 2) when underground soil resistivity than the depths is low, can adopt well formula or deep drilling formula earth electrode; 3) fill lower material or the resistance reducing agent of resistivity; 4) lay ground network under water.For city transformer station, because the restriction of surrounding environment, do the Down conductor utmost point and lay that earth mat is all unlikely under water.It is big to fill resistivity lower material or resistance reducing agent quantities, and expense is higher, and resistance reducing agent is easy to generate pollution, if underground water source is more shallow, also should not adopt.
The utility model content
The purpose of the utility model provides a kind of under the situation that reduces transformer station's floor space, reduces the ground network of the city complete indoor transformer station of 220kV of grounded screen electric resistance.
For realizing above-mentioned purpose, the utility model adopts following technical scheme:
This ground network is arranged in the below in each distribution building of transformer station, comprise being positioned at-the horizontal earth mat I of 0.8m, it also comprise be positioned at-3m~-the horizontal earth mat II of 5m, described horizontal earth mat I and horizontal earth mat II are connected in parallel, and constitute double-layer horizontal ground network thus.
The adjacent distribution of the transformer station horizontal earth mat II of side downstairs interconnects.
On described horizontal earth mat II, beat at least two kinds of vertical grounding electrodes, vertical grounding electrode comprises two kinds of 10m vertical grounding electrode and 2.5m vertical grounding electrodes.
Described double-layer horizontal ground network connects the reinforcing bar in the distribution building pile foundation through conductor.
Described horizontal earth mat I is connected the earth electrode of bottom, transformer station cable tunnel with horizontal earth mat II.
Adopt the utility model of technique scheme, can effectively reduce the resistivity of ground network.Below with the emerging magnificent 220kV transformer station of my institute design be example explanation take that above measure reduces that indoor station earth resistance gets effect.Emerging mutinying by-0.8m and the-double-deck grounding grid design of 4.4m, and-4.4m layer earth mat place has increased by 12 vertical grounding electrodes that 10m is long in addition.-0.8m is respectively 308 Ω m and 124.6 Ω m with-4.4m layer soil resistivity, is 36.1 Ω m (above all considered seasonal factors) greater than-10m place soil resistivity.Through the horizontal ground network ground resistance of calculating-0.8m is 2.36 Ω; The horizontal ground network ground resistance of-4.4m is 1.05 Ω; The 12 long vertical junction terrain of 10m earth resistances are 0.49 Ω; And the earth mat of reinforcing bar in the distribution building pile foundation and cable tunnel is connected with substation ground network, makes that the compound earth resistance of full station level and vertical grounding electrode is 0.366 Ω, satisfy code requirement.
Description of drawings
Fig. 1 is the overall structure sketch map of the utility model.
Embodiment
In the utility model; The ground network of the city complete indoor transformer station of 220kV is arranged in the below in each distribution building of transformer station, in general comprises being positioned at-the horizontal earth mat I 1 of 0.8m, and-0.8m layer soil resistivity is generally higher; Reach hundreds of Ω m, so this layer ground network ground resistance is bigger.In the utility model, above distribution building bar base, highly about-3m ~-5m does the horizontal earth mat II 2 of one deck in addition and is connected in parallel with the horizontal earth mat I 1 of-0.8m.For saving quantities, the extension of earth mat can be equal to the extension of bar base basically; Like transformer station 2 distribution buildings are arranged, must the horizontal earth mat II 2 of bar base top, two buildings be linked to each other.Adopt this way, if underground less than the depths soil resistivity, then the earth resistance of deep layer earth mat can be much smaller than-0.8m layer earth mat, and both have the relation of parallel connection, and therefore total earth resistance can reduce greatly.
In addition; Can also on horizontal earth mat II 2, beat at least two deep drilling formula vertical grounding electrodes 3; The quantity of vertical grounding electrode 3 can be decided according to the actual requirements, can be two, three, five, eight, ten, 12,20 or even more, in general; This vertical grounding electrode 3 can comprise two kinds of 10m vertical grounding electrode and 2.5m vertical grounding electrodes, helps to reduce the earth resistance and the discharge capacity that increases short circuit current of earth mat like this.
In addition, for reducing resistivity better, the utility model can also make full use of natural grounding substance.When the basis in distribution building needs piling, because that stake can be deep at an end is underground than the depths, may touch underground water source, this moment horizontal earth mat I 1 and horizontal earth mat II 2 are connected the reinforcing bar in the pile foundation in distribution building through conductor 4, play the effect of falling resistance.
Simultaneously, because the outlet at indoor station is generally cable, and draws, therefore horizontal earth mat I 1 is connected the earth electrode 5 of bottom, transformer station cable tunnel with horizontal earth mat II 2 in the cable tunnel.Because the tunnel is longer, also can play the effect of falling resistance.But should note the verification touch voltage when in utilizing slave station, guiding the metallic conduit (like drainage pipe) outside the station into, then should not link to each other as not meeting the demands, and should take quarantine measures with ground network.

Claims (6)

1. the ground network of the city complete indoor transformer station of 220kV; This ground network is arranged in the below in each distribution building of transformer station; Comprise being positioned at-the horizontal earth mat I (1) of 0.8m; It is characterized in that: it also comprise be positioned at-3m~-the horizontal earth mat II (2) of 5m, described horizontal earth mat I (1) and horizontal earth mat II (2) are connected in parallel, and constitute double-layer horizontal ground network thus.
2. the ground network of the city according to claim 1 complete indoor transformer station of 220kV is characterized in that: the adjacent distribution of the transformer station horizontal earth mat II (2) of side downstairs interconnects.
3. the ground network of the city according to claim 1 and 2 complete indoor transformer station of 220kV is characterized in that: go up in described horizontal earth mat II (2) and beat at least two kinds of vertical grounding electrodes (3).
4. the ground network of the city according to claim 3 complete indoor transformer station of 220kV is characterized in that: described vertical grounding electrode (3) comprises two kinds of 10m vertical grounding electrode and 2.5m vertical grounding electrodes.
5. the ground network of the city according to claim 1 complete indoor transformer station of 220kV is characterized in that: described double-layer horizontal ground network connects the reinforcing bar in the distribution building pile foundation through conductor (4).
6. the ground network of the city according to claim 5 complete indoor transformer station of 220kV is characterized in that: described horizontal earth mat I (1) is connected the earth electrode (5) of bottom, transformer station cable tunnel with horizontal earth mat II (2).
CN2011205207772U 2011-12-14 2011-12-14 Grounding net of urban indoor 220kV transformer substation Expired - Fee Related CN202384676U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011205207772U CN202384676U (en) 2011-12-14 2011-12-14 Grounding net of urban indoor 220kV transformer substation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102916319A (en) * 2012-09-28 2013-02-06 中国科学院等离子体物理研究所 Indoor ground screen reconstruction method for S band continuous wave high-power microwave system
CN103166141A (en) * 2011-12-14 2013-06-19 河南省电力勘测设计院 Grounding grid of urban full-indoor transformer substation of 220kV
CN103594826A (en) * 2013-11-12 2014-02-19 国家电网公司 Conductive concrete module grounding grid

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103166141A (en) * 2011-12-14 2013-06-19 河南省电力勘测设计院 Grounding grid of urban full-indoor transformer substation of 220kV
CN103166141B (en) * 2011-12-14 2016-04-06 河南省电力勘测设计院 The ground network of the full indoor substation of a kind of city 220kV
CN102916319A (en) * 2012-09-28 2013-02-06 中国科学院等离子体物理研究所 Indoor ground screen reconstruction method for S band continuous wave high-power microwave system
CN102916319B (en) * 2012-09-28 2015-05-06 中国科学院等离子体物理研究所 Indoor ground screen reconstruction method for S band continuous wave high-power microwave system
CN103594826A (en) * 2013-11-12 2014-02-19 国家电网公司 Conductive concrete module grounding grid
CN103594826B (en) * 2013-11-12 2016-08-17 国家电网公司 Conducting concrete module ground net

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120815

Termination date: 20161214