CN103928846A - Method for improving local step potentials of transformer substation - Google Patents
Method for improving local step potentials of transformer substation Download PDFInfo
- Publication number
- CN103928846A CN103928846A CN201410172718.9A CN201410172718A CN103928846A CN 103928846 A CN103928846 A CN 103928846A CN 201410172718 A CN201410172718 A CN 201410172718A CN 103928846 A CN103928846 A CN 103928846A
- Authority
- CN
- China
- Prior art keywords
- ground pipe
- ground
- pipe
- transformer substation
- step voltage
- Prior art date
- 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.)
- Granted
Links
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention relates to a method for improving local step potentials of a transformer substation, and belongs to the technical field of transformer substation operation and high voltage, wherein the method is used for improving the local step potentials of a standard-exceeding area of the transformer substation and protecting the safety of personnel in the transformer substation. The method comprises the steps of analyzing the performance of a grounding network, determining the area with the step potentials exceeding the standard, surveying the water lever of the transformer substation, determining the length of a grounding pipe, manufacturing the grounding pipe, arranging the grounding pipe in a buried mode and welding the grounding pipe and the horizontal grounding network. The method increases the human body tolerance limiting value, lowers the step potentials and effectively protects the personal safety.
Description
Technical field
The present invention relates to a kind of method of improving the local step voltage of transformer station, for improving the transformer station part region step voltage that exceeds standard, protection transformer station personnel safety, belongs to substation operation and high voltage technique field.
Background technology
In electric power system, in order to work and security needs, often the shell of electric power system and electric equipment thereof, Zero potential reference, screen etc. are connected with the earth, be called ground connection.System in Substation is basic assurance and the important measures of safeguarding power system security reliability service, ensureing operations staff and electric equipment safety.
Ordinary circumstance issues, the earthing device of transformer station is to lay some conductors of all pressing taking outer rim closure, centre as main horizontal grounding net, and buried depth is generally 0.6m～1.0m, sometimes adds a little vertical grounding electrodes, and they are connected with horizontal grounding net.Due to the existence of electric resistance of soil, ground network electric current, can produce pressure drop and form certain surface potential distribution from grounding electrode in the time that surrounding soil is wandering in soil.When sending out, transformer station while breaking down fault current flow into soil by grounding system, can produce on ground inhomogeneous Potential distribution.In the time that people walks about near electrode, people's bipod is upper by the different potentials point in Earth Surface, and the span T between bipod is taken as 1.0m conventionally.Therefore, step voltage is defined as follows conventionally: in the time that earth short circuit current flows through earthing device, the potential difference of the point-to-point transmission that on ground, horizontal range is 1.0m is called step voltage (step voltage is poor) Ek.
Step voltage is an important indicator weighing ground network security performance.Often there will be that certain grounding resistance of transformer substation grounding net is qualified but situation that local step voltage exceeds standard need to be taked the local measure that reduces step voltage targetedly.Normally reduce step voltage by the density of burying underground that increases earth electrode at present, or improve the limit of tolerance of human body at earth's surface laying resistive formation.But the density of burying underground of earth electrode is difficult to further increase sometimes, can not reduce step voltage and lay resistive formation on earth's surface, sometimes only lays resistive formation and still can not meet safety requirements, needs to take other measures for this reason.This patent proposes a kind of method that reduces this region step voltage by reducing local soil resistivity.
Summary of the invention
The object of the invention is to propose a kind of method of improving the local step voltage of transformer station, by reducing the resistivity of local soil, and lay earth's surface resistive formation and realize this goal, effective guarantee transformer station personnel personal safety.
In order to address the above problem, the present invention is achieved by the following technical solutions:
A method of improving the local step voltage of transformer station, comprises the following steps:
Step 1, analysis grounding net performance, determine the step voltage region that exceeds standard;
Step 2, exploration transformer station water level, determine the length of ground pipe;
Step 3, use metal tube are as ground pipe, and the diameter of ground pipe is 3-5cm, on ground pipe tube wall, leaves hole a every 20-30cm;
Described ground pipe is preferably stainless steel tube or hot galvanized steel pipe;
Step 4, use the rig b that holes in ground, b aperture, hole is consistent with the diameter of ground pipe, and ground pipe is pounded in hand-hole b, in the gap between ground pipe and ground, pours into carbon dust, and does not shut ground pipe upper end, and shut lower end;
Step 5, ground pipe and horizontal grounding net are reliably welded;
Step 6, in the step voltage region that exceeds standard, lay the thick gravel of 10cm or asphalt concrete as resistive formation.
The method of the invention principle and well are similar, because does not shut the upper end of ground pipe, air pressure in pipe is atmospheric pressure, ground pressure outside pipe is larger, on ground pipe aperture, can produce pressure differential thus, under the effect of this pressure differential, hydrone moves in the less pipe of pressure, around ground pipe, forms by the region increasing gradually as far as humidity near, soil.Because the humidity of soil resistivity and soil is closely related, soil moisture is larger, and its resistivity is lower.Therefore,, around ground pipe, soil resistivity is lower.Because in fact step voltage is exactly the potential difference that earth current forms while flowing in soil, therefore the resistivity of soil is lower, and the potential difference in ground is just less.Therefore burying underground of ground pipe, make its around the epd of low resistance soil region reduce, also just reduced the step voltage in this region.
Soil resistivity reduces, and the step voltage limit of tolerance of human body also reduces, therefore, in the step voltage region that exceeds standard, more further lay the thick gravel of 10cm or asphalt concrete as resistive formation, make on the one hand step voltage reduce, improve again on the other hand the limit of tolerance of human body
Thereby ensure personal safety.
Beneficial effect of the present invention is:
1, owing to having utilized the principle of well, ground pipe surrounding soil humidity raises naturally, and is long-acting, environmental protection.
2, compared with only laying resistive formation, the present invention has not only improved the limit of tolerance of human body, has also reduced step voltage, has effectively protected personal safety.
Brief description of the drawings
The step voltage that Fig. 1 suffers for human body;
Fig. 2 is the aqueous soil administrative division map that underground water forms;
Fig. 3 is the schematic diagram of the method for the invention;
Fig. 4 is step voltage distribution schematic diagram.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is described in further detail.But example is not as a limitation of the invention.
A method of improving the local step voltage of transformer station, comprises the following steps:
Step 1, analysis grounding net performance, determine the step voltage region that exceeds standard.
Step 2 is surveyed transformer station's water level, determines the length of ground pipe;
Step 3, use metal tube are as ground pipe, and the diameter of ground pipe is 3-5cm, on ground pipe tube wall, leaves hole a every 20-30cm.
Described ground pipe is preferably stainless steel tube or hot galvanized steel pipe
Step 4, use the rig b that holes in ground, b aperture, hole is consistent with the diameter of ground pipe, and ground pipe is pounded in hand-hole b, in the gap between ground pipe and ground, pours into carbon dust, and does not shut ground pipe upper end, and shut lower end;
Step 5, ground pipe and horizontal grounding net are reliably welded.
Step 6, in the step voltage region that exceeds standard, lay the thick gravel of 10cm or asphalt concrete as resistive formation.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (2)
1. a method of improving the local step voltage of transformer station, is characterized in that, comprises the following steps:
Step 1, analysis grounding net performance, determine the step voltage region that exceeds standard;
Step 2 is surveyed transformer station's water level, determines the length of ground pipe;
Step 3, use metal tube are as ground pipe, and the diameter of ground pipe is 3-5cm, on ground pipe tube wall, leaves hole a every 20-30cm;
Step 4, use the rig b that holes in ground, b aperture, hole is consistent with the diameter of ground pipe, and ground pipe is pounded in hand-hole b, in the gap between ground pipe and ground, pours into carbon dust, and does not shut ground pipe upper end, and shut lower end;
Step 5, ground pipe and horizontal grounding net are reliably welded;
Step 6, in the step voltage region that exceeds standard, lay the thick gravel of 10cm or asphalt concrete as resistive formation.
2. a kind of method of improving the local step voltage of transformer station as claimed in claim 1, is characterized in that, described ground pipe is stainless steel tube or hot galvanized steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410172718.9A CN103928846B (en) | 2014-04-25 | 2014-04-25 | A kind of method of improving the local step voltage of transformer station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410172718.9A CN103928846B (en) | 2014-04-25 | 2014-04-25 | A kind of method of improving the local step voltage of transformer station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103928846A true CN103928846A (en) | 2014-07-16 |
| CN103928846B CN103928846B (en) | 2016-05-04 |
Family
ID=51146973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410172718.9A Active CN103928846B (en) | 2014-04-25 | 2014-04-25 | A kind of method of improving the local step voltage of transformer station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103928846B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010025150A (en) * | 2000-04-14 | 2001-04-06 | 박종순 | arc-inducing type driven rod with needles |
| CN2512128Y (en) * | 2001-10-19 | 2002-09-18 | 中国人民解放军66169部队 | Ground body |
-
2014
- 2014-04-25 CN CN201410172718.9A patent/CN103928846B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010025150A (en) * | 2000-04-14 | 2001-04-06 | 박종순 | arc-inducing type driven rod with needles |
| CN2512128Y (en) * | 2001-10-19 | 2002-09-18 | 中国人民解放军66169部队 | Ground body |
Non-Patent Citations (1)
| Title |
|---|
| 何金良,曾嵘: "《电力系统接地技术》", 28 February 2007, 科学出版社 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103928846B (en) | 2016-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103899883B (en) | The comprehensive protecting method that oil and gas pipes disturbs for shape high voltage DC earthing pole | |
| CN207581946U (en) | Cathodic protection data Telemetry System Used in Pipeline and pipe safety guard system | |
| CN103326139B (en) | Hollow aluminum alloy tube grounding device capable of being assembled | |
| CN207994094U (en) | A kind of grounding net of transformer substation | |
| CN204497393U (en) | A kind of conduction anti-corrosion type earthing device | |
| RU2695101C1 (en) | Method of making anode grounding | |
| RU2521927C1 (en) | Anodic earthing method | |
| CN203858320U (en) | Grounding grid corrosion and breakpoint detection system based on threshold value comparison | |
| CN103928771A (en) | Grounding method of reducing local impact grounding resistance of power plant and substation | |
| CN107728024A (en) | A kind of large-scale grounding network impact characteristics method of testing to be flowed back using earth mat | |
| CN204924885U (en) | Sensor structure that ground net etch state detected | |
| CN103928846B (en) | A kind of method of improving the local step voltage of transformer station | |
| CN105071061B (en) | A kind of lightning protection earthing system of power distribution station | |
| CN206310241U (en) | A kind of gas pipeline gas-oil valve grounding-for-lightning device | |
| CN207541167U (en) | A kind of detecting system of buried steel pipe exchange drain means | |
| CN104483578B (en) | It is a kind of to assess the method that D.C. magnetic biasing influences on power system grounded screen | |
| CN209691432U (en) | A kind of resistance to dilatory cable | |
| CN107727970A (en) | A kind of detection method and system of buried steel pipe exchange drain means | |
| CN103117541B (en) | The personal safety otherness means of defence of electric power line pole tower ground connection | |
| CN206096492U (en) | High tension cable hole site monitoring devices in electric power calandria | |
| CN207530308U (en) | A kind of lightning protection system of side slope anchor cable monitoring system | |
| CN206134958U (en) | Stake of pre -buried formula ground connection | |
| CN109713540A (en) | A kind of vertical deep grounding resistance-reducing method of grid equipment grounded screen copper plated steel | |
| CN104505684B (en) | Earthing pole installation method and earthing pole | |
| CN205539166U (en) | Reserve ground net and bury point discharge device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |