CN211367742U - Transformer substation grounding system - Google Patents
Transformer substation grounding system Download PDFInfo
- Publication number
- CN211367742U CN211367742U CN201922429880.5U CN201922429880U CN211367742U CN 211367742 U CN211367742 U CN 211367742U CN 201922429880 U CN201922429880 U CN 201922429880U CN 211367742 U CN211367742 U CN 211367742U
- Authority
- CN
- China
- Prior art keywords
- grounding
- transformer substation
- steel composite
- substation
- steel
- 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.)
- Active
Links
Images
Landscapes
- Prevention Of Electric Corrosion (AREA)
Abstract
The utility model relates to a transformer substation grounding system, including burying steel composite grounding net, a plurality of sacrificial anode under the terrace of transformer substation underground. The sacrificial anode comprises an anode body, a filler and a cloth bag, wherein the anode body is arranged in the cloth bag, the filler is filled between the anode body and the cloth bag, and the anode body is connected with the steel composite grounding grid through a cable. The transformer substation grounding system further comprises a detection device for detecting the corrosion state of the sacrificial anode, wherein the detection device comprises a plurality of test piles connected with reference electrodes, and the test piles are respectively connected with the steel composite grounding network and the sacrificial anode. The test pile comprises a concrete base at least partially embedded under the floor of the transformer substation, and a pile body with the lower end arranged in the concrete base, wherein the upper end of the pile body is provided with a test end connected with the reference electrode, the steel composite grounding grid and the sacrificial anode. The utility model discloses corrosion resistance is good and the cost is lower, can not bring adverse effect to the environment.
Description
Technical Field
The utility model relates to a power transmission and transformation engineering design technical field, concretely relates to grounding system suitable for indoor transformer substation entirely.
Background
The corrosion of the grounding device of the transformer substation can cause a series of problems such as the breakage of a grounding grid, the deterioration of electrical connection performance, the increase of power frequency grounding resistance and the like. The common grounding grid is made of steel and copper. Steel is corroded layer by layer, and a zinc coating has certain corrosion resistance, but the effect is very limited. Copper has better corrosion resistance than carbon steel, and the corrosion rate in soil is about one tenth of that of steel. However, the copper grounding grid and the steel frame support structure form a corrosion primary battery, and corrosion of the steel frame of the underground part is accelerated. In addition, because copper is heavy metal and belongs to micro-toxicity, the excessive copper is harmful to human bodies, and the copper content in soil and underground water is strictly controlled in all countries in the world. In addition, in regions with high ground water levels such as coastal regions, low-lying areas, dark ponds and the like, the soil resistivity is low, and not only is the steel structure strongly corroded, but also copper is corroded.
Therefore, as the scheme of the transformer substation grounding grid gradually becomes the key for ensuring the safe and stable operation of the transformer substation, a novel corrosion-resistant grounding grid needs to be designed.
Disclosure of Invention
The utility model aims at providing a transformer substation grounding system that has better corrosion resistance and can not bring harm to the environment.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the utility model provides a transformer substation grounding system sets up in the transformer substation, transformer substation grounding system including bury underground in steel composite grounding net under the terrace of transformer substation, with a plurality of sacrificial anode that steel composite grounding net is connected, equipment in the transformer substation with steel composite grounding net is connected.
Preferably, the sacrificial anode comprises an anode body, a filler and a cloth bag, the anode body is arranged in the cloth bag, the filler is filled between the anode body and the cloth bag, and the anode body is connected with the steel composite grounding grid through a cable.
Preferably, the connection points of the sacrificial anode and the steel composite grounding grid are uniformly distributed on the steel composite grounding grid.
Preferably, the steel composite grounding grid comprises a plurality of horizontal grounding bodies and a plurality of vertical grounding bodies connected with the horizontal grounding bodies, and the sacrificial anode is connected with the vertical grounding bodies.
Preferably, the horizontal grounding body is made of hot galvanized flat steel, and the vertical grounding body is made of equal angle steel.
Preferably, equipment in the transformer substation is connected with the steel composite grounding grid through an equipment down lead, and the equipment down lead is made of hot-galvanized flat steel.
Preferably, the burying depth of the sacrificial anode is greater than that of the steel composite grounding grid.
Preferably, the transformer substation grounding system further comprises a detection device for detecting the corrosion state of the sacrificial anode, wherein the detection device comprises a plurality of test piles connected with reference electrodes, and the test piles are respectively connected with the steel composite grounding grid and the sacrificial anode.
Preferably, the test pile comprises a concrete base at least partially embedded under the floor of the transformer substation, and a pile body, the lower end of the pile body is arranged in the concrete base, the upper end of the pile body is exposed out of the floor of the transformer substation, and the upper end of the pile body is provided with a test end connected with the reference electrode, the steel composite grounding grid and the sacrificial anode.
Preferably, a steel bar connected with the pile body is arranged in the concrete base.
Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages: the utility model discloses an utilize sacrificial anode cathodic protection anticorrosion technique and transformer substation's ground system that designs, its corrosion resistance is good and the cost is lower, can not bring adverse effect to the environment.
Drawings
Fig. 1 is the utility model discloses a detection device's wiring schematic diagram among transformer substation's ground system.
Fig. 2 is the utility model discloses a buried front view underground of detection device's test pile among transformer substation's ground system.
Fig. 3 is the utility model discloses a side view of detection device's test stake in transformer substation's ground system.
Fig. 4 is an assembly diagram of a sacrificial anode in the grounding system of a transformer substation according to the present invention.
Fig. 5 is a schematic diagram of local connection and embedding of the transformer substation grounding system of the present invention.
In the above drawings: 1. a steel composite grounding grid; 2. a sacrificial anode; 3. a reference electrode; 4. a concrete base; 5. a pile body; 6. reinforcing steel bars; 7. an anode body; 8. a filler; 9. a cloth bag; 10. an electrical cable.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings.
The first embodiment is as follows: the cathodic protection anticorrosion technology is based on the corrosion process of a grounding device, which is mainly an electrochemical process, and utilizes the principle of corrosion battery to take a metal structure to be protected as a cathode by coupling (anode) with a metal (such as magnesium, zinc and the like) with a corrosion potential lower than the natural potential of iron or applying a cathodic current, and uninterruptedly provides electrons to the cathode through the anode, so that the structure is polarized at first, and then the electrons are enriched on the surface of the structure, so that the ions are not easily generated, and the corrosion speed of the structure is greatly reduced.
Based on this, a transformer substation grounding system arranged in a transformer substation is provided, as shown in fig. 1 and 5, which comprises a steel composite grounding grid 1 and a plurality of sacrificial anodes 2, which are all buried under the floor of the transformer substation.
The steel composite grounding grid 1 is similar to the existing grounding grid structure and comprises a plurality of horizontal grounding bodies and a plurality of vertical grounding bodies connected with the horizontal grounding bodies, wherein the horizontal grounding bodies are usually connected in a cross mode to form a net shape, and the vertical grounding bodies are connected to the cross connection positions of the horizontal grounding bodies. The horizontal grounding body is made of hot galvanized flat steel, and the vertical grounding body is made of equal angle steel. And voltage equalizing belts can be arranged at the gate of the transformer substation and the entrance of the master control building to reduce the step voltage.
The equipment in the transformer substation is connected with the steel composite grounding grid 1 through the equipment down lead which is made of hot galvanizing flat steel.
The sacrificial anode 2 is connected with the steel composite grounding grid 1, in particular to a vertical grounding body. The connection points of the sacrificial anodes 2 and the steel composite grounding grid 1 are uniformly distributed on the steel composite grounding grid 1. As shown in fig. 4, the sacrificial anode 2 comprises an anode body 7 (e.g. a magnesium anode), a filler 8 and a cloth bag 9. The anode body 7 is arranged in the cloth bag 9, the filler 8 is filled between the anode body 7 and the cloth bag 9, so that the anode body 7 is positioned at the central position of the cloth bag 9, the anode body 7 is connected with the steel composite grounding net 1 through a cable 10, and the cable 10 is led out from the bag opening of the cloth bag 9. The filler 8 is a special filler 8 for a low-potential alloy anode. The cloth bag 9 is preferably a permeable sailcloth bag 9, and a plastic bag cannot be used. In the process of installing the sacrificial anode 2, the surface of the anode body 7 should be kept clean and not stained with stains such as paint, oil stains and the like. The cable 10 cannot be pulled when the sacrificial anode 2 is handled and placed, to prevent the cable 10 and the anode body 7 from coming apart. In the present embodiment, four sacrificial anodes 2 are provided.
As shown in fig. 5, the burying depth of the sacrificial anode 2 is larger than that of the steel composite grounding grid 1. When the steel composite grounding net 1 and the sacrificial anode 2 are buried, the buried depth of the sacrificial anode 2 is less than 1 meter of the terrace, the buried depth of the horizontal grounding body in the steel composite grounding net 1 is not less than 0.8 meter below the terrace, and the vertical grounding body is positioned below the horizontal grounding body. The covering soil after the steel composite grounding grid 1 is buried adopts dug original soil.
In addition, the above-described substation grounding system further includes a detection device for detecting the corrosion state of each sacrificial anode 2. The detection device comprises a plurality of test piles connected with reference electrodes 3, and the test piles are respectively connected with the steel composite grounding grid 1 and the sacrificial anode 2. Typically one test peg is arranged in correspondence with a plurality of sacrificial anodes 2.
As shown in fig. 1 to 3, the test pile includes a concrete base 4 at least partially embedded under the terrace of the transformer substation, a pile body 5 having a lower end disposed in the concrete base 4 and an upper end exposed above the terrace of the transformer substation, a steel bar 6 connected to the pile body 5 is disposed in the concrete base 4, and a test end connected to the reference electrode 3, the steel composite grounding grid 1 and the sacrificial anode 2 is disposed at the upper end of the pile body 5. The embedding depth of the test pile is less than 0.5 m below the terrace.
Through above-mentioned detection device, can carry out periodic detection and evaluation to the operation conditions and the protection result of ground system, during later maintenance, only need carry out the measurement of parameters such as electric potential to the test stake, can know sacrificial anode 2's consumption condition, confirm whether need change sacrificial anode 2 to effectively avoid digging the earth mat blindly and go to seek ground connection breakpoint and serious corrosion section.
Compared with the existing grounding grid scheme, the scheme of the transformer substation grounding system is equivalent to that the sacrificial anode 2 is additionally arranged on the basis of the original steel grounding grid (namely the traditional flat steel grounding grid), the detection device is arranged, the arrangement of the traditional grounding grid is not influenced, the grounding function can be continuously, stably and effectively realized, the environment is not polluted, the design life is prolonged, the workload of inspection and maintenance after operation is reduced, and the investment cost and the operation cost are saved. The concrete description is as follows:
(1) the corrosion of the grounding down conductor can be ignored, and the thermal stability of the down conductor is enhanced;
(2) for the grounding down lead except the neutral point of the transformer, a single grounding down lead can be selected, so that the grounding reliability requirement can be met, and the investment can be reduced;
(3) the support structure of the steel frame of the underground part and other metal structures are not influenced, and the protection effect is realized;
(4) through regular and quantitative detection, the effectiveness of the anti-corrosion system of the grounding device is guaranteed, the times and maintenance cost of excavation and maintenance of the grounding grid are greatly reduced, and the invisible full-life cycle is larger in economy.
The transformer substation grounding system is compared with the existing steel grounding grid and copper grounding grid as follows:
the statistical results of the materials required by the steel grounding grid scheme are shown in table 1, the statistical results of the materials required by the copper grounding grid scheme are shown in table 2, and the statistical results of the materials required by the transformer substation grounding system (namely the grounding scheme of the steel grounding grid plus the cathodic protection) are shown in table 3.
TABLE 1 Material watch with steel grounding design
TABLE 2 Material watch with copper grounding design
| Serial number | Name (R) | Type and specification | Unit of | Number of | Remarks for |
|
| 1 | Copper-plated grounding rod | Φ20mm2.5m | Root of herbaceous plant | 100 | Main grounding grid |
|
| 2 | Copper stranded wire | 240mm2 | m | 3000 | Main grounding grid |
|
| 3 | Copper-plated | Phi | 20 mmL-30 m | Root of |
4 | |
| 4 | Copper-plated flat steel | －40×5 | m | 100 | |
|
| 5 | Welding material | | Sleeve | 1 |
TABLE 3 Material watch adopting flat steel plus cathodic protection grounding design
Comparing the cathode protection on the flat steel with the copper and the hot-dip galvanized steel through the whole life cycle economy, calculating the one-time service life of the hot-dip galvanized steel according to 15 years (according to literature statistics, the general corrosive area zinc-coated steel is used for about 15 years, the grounding body is seriously corroded, and needs to be excavated, overhauled or re-laid, so the technical and economic analysis selects 15 years), calculating the copper grounding according to 60 years under the same soil condition, calculating the cathode protection on the flat steel according to 60 years, and finding out a comparison result in a table 4.
TABLE 4 comparative analysis of investment in grounding network of copper and hot-dip galvanized steel
| Comparing items | Hot-dip galvanized steel grounding material | Copper grounding material | Flat steel plus cathodic protection |
| Direct economic price/yuan/t | 5670 | 54000 | 5670 |
| |
1 | 0.43 | 0.86 |
| Cathode protection system price | - | - | 158600 |
| Investment ratio of |
1 | 4.63 | 2.67 |
| Ratio of total life (individual/60) | 0.25 | 1 | 1 |
| Life cycle investment ratio (material cost) | 4 | 4.63 | 2.67 |
The description for the above table is as follows:
(1) a comparison calculation was made with a design section defined as 1 for a galvanized flat steel of 70 × 8, and 240mm2The cross section ratio of the copper stranded wire is as follows:
(2) and (3) performing comparative calculation by taking the definition of the hot-dip galvanized steel as 1, wherein the material investment ratio of copper is as follows:
(3) the total life investment ratio is the disposable material investment ratio/total life ratio.
From table 4, the material cost of using flat steel plus cathodic protection for the full life cycle can be saved by more than 40% compared to copper; compared with galvanized steel, the steel can save more than 30 percent. Compared with a hot-dip galvanized steel grounding material, the flat steel and cathode protection grounding network is used, so that the design life is prolonged, the material cost of the whole life cycle is reduced, the excavation and maintenance times and maintenance cost of the grounding network are greatly reduced, and the invisible whole life cycle is more economic; the life cycle material cost is reduced compared to copper ground materials.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. The utility model provides a transformer substation's ground system sets up in the transformer substation which characterized in that: the transformer substation grounding system comprises a steel composite grounding grid buried under the terrace of the transformer substation and a plurality of sacrificial anodes connected with the steel composite grounding grid, and equipment in the transformer substation is connected with the steel composite grounding grid.
2. The substation grounding system of claim 1, wherein: the sacrificial anode comprises an anode body, a filler and a cloth bag, wherein the anode body is arranged in the cloth bag, the filler is filled between the anode body and the cloth bag, and the anode body is connected with the steel composite grounding grid through a cable.
3. The substation grounding system of claim 1, wherein: and the connection points of the sacrificial anode and the steel composite grounding grid are uniformly distributed on the steel composite grounding grid.
4. The substation grounding system of claim 1, wherein: the steel composite grounding grid comprises a plurality of horizontal grounding bodies and a plurality of vertical grounding bodies connected with the horizontal grounding bodies, and the sacrificial anode is connected with the vertical grounding bodies.
5. The substation grounding system of claim 4, wherein: the horizontal grounding body is made of hot galvanized flat steel, and the vertical grounding body is made of equal angle steel.
6. The substation grounding system of claim 4, wherein: and equipment in the transformer substation is connected with the steel composite grounding grid through an equipment down lead, and the equipment down lead is made of hot-dip galvanized flat steel.
7. The substation grounding system of claim 1, wherein: the embedding depth of the sacrificial anode is greater than that of the steel composite grounding grid.
8. The substation grounding system of claim 1, wherein: the transformer substation grounding system further comprises a detection device for detecting the corrosion state of the sacrificial anode, wherein the detection device comprises a plurality of test piles connected with reference electrodes, and the test piles are respectively connected with the steel composite grounding grid and the sacrificial anode.
9. The substation grounding system of claim 8, wherein: the testing pile comprises a concrete base at least partially embedded under the terrace of the transformer substation, a pile body with the lower end arranged in the concrete base and the upper end exposed above the terrace of the transformer substation, and a testing end connected with the reference electrode, the steel composite grounding grid and the sacrificial anode is arranged at the upper end of the pile body.
10. The substation grounding system of claim 9, wherein: and reinforcing steel bars connected with the pile bodies are arranged in the concrete base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922429880.5U CN211367742U (en) | 2019-12-30 | 2019-12-30 | Transformer substation grounding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922429880.5U CN211367742U (en) | 2019-12-30 | 2019-12-30 | Transformer substation grounding system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211367742U true CN211367742U (en) | 2020-08-28 |
Family
ID=72171550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922429880.5U Active CN211367742U (en) | 2019-12-30 | 2019-12-30 | Transformer substation grounding system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211367742U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110965065A (en) * | 2019-12-30 | 2020-04-07 | 苏州电力设计研究院有限公司 | Transformer substation grounding system |
-
2019
- 2019-12-30 CN CN201922429880.5U patent/CN211367742U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110965065A (en) * | 2019-12-30 | 2020-04-07 | 苏州电力设计研究院有限公司 | Transformer substation grounding system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103457044B (en) | The earthing device of 10kV distribution network overhead line tower pole and laying method thereof | |
| CN211182560U (en) | Novel tower lightning grounding device | |
| CN109097782A (en) | A kind of spiral ground pile anti-corrosion protection system and its application method | |
| CN211367742U (en) | Transformer substation grounding system | |
| CN111541121A (en) | Method for reducing impact grounding impedance of power transmission line tower | |
| CN103668221A (en) | Transformer substation grounding grid corrosion prevention protection construction method | |
| CN112580697A (en) | Method and system for selecting grounding of power transmission line tower | |
| CN103779824A (en) | Photovoltaic solar building lightning protection facility construction method | |
| CN210468155U (en) | Measurable lightning protection grounding system suitable for complementary photovoltaic power plant of farming light | |
| CN110965065A (en) | Transformer substation grounding system | |
| CN105506645A (en) | Anticorrosion device and anticorrosion method of ground wire | |
| CN204257835U (en) | Resistance module falls in a kind of special-shaped graphite ground connection | |
| Myers et al. | Conditions contributing to underground copper corrosion | |
| CN215218493U (en) | Regional cathodic protection test field for buried pipeline of nuclear power plant | |
| CN202272956U (en) | Novel anti-corrosive grounding body with cathode protecting function | |
| CN207877869U (en) | A kind of underground oil and gas pipeline cathode protection device | |
| CN217499428U (en) | Auxiliary anode assembly and impressed current cathodic protection system | |
| CN204809570U (en) | Netted formula lightning grounding line of electric power | |
| CN103255426A (en) | Cathode protection method for bottom plate of high concentration coal slurry storage tank | |
| CN104483578B (en) | It is a kind of to assess the method that D.C. magnetic biasing influences on power system grounded screen | |
| CN202064367U (en) | Insulating base for power tower | |
| CN204185573U (en) | A kind of corrosion-resisting device of grounding wire | |
| CN207852955U (en) | A kind of anticorrosion grounding apparatus | |
| CN212114041U (en) | Grounding device for high-impedance soil graphite and power equipment grounding engineering | |
| CN109957804A (en) | A kind of drainage method for buried metal pipeline near direct current grounding pole |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |