CN105375127B - The reduction grounding resistance method of ground connection deep-well mode is beaten in a kind of transformer station - Google Patents
The reduction grounding resistance method of ground connection deep-well mode is beaten in a kind of transformer station Download PDFInfo
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- CN105375127B CN105375127B CN201510942376.9A CN201510942376A CN105375127B CN 105375127 B CN105375127 B CN 105375127B CN 201510942376 A CN201510942376 A CN 201510942376A CN 105375127 B CN105375127 B CN 105375127B
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- ground connection
- electromotive force
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- potential difference
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
Abstract
The reduction grounding resistance method of ground connection deep-well mode is beaten in a kind of transformer station.Step is as follows：Calculate site soil layering model；The target components such as the safety value of calculated level grounded screen power frequency earthing resistance safety value, contact electromotive force and step potential difference；Obtain horizontal grounding net power frequency earthing resistance calculated value, contact electromotive force and step potential difference calculated value；It is determined that ground connection deep-well quantity, position, well depth, vertical grounding electrode material and equivalent redius；Adjustment ground connection deep-well parameter；Provide the calculated value and safety value of the horizontal grounding net materials table of the station grounded screen, Grounding Grids material table, ground potential liter, power frequency earthing resistance, contact electromotive force and step potential difference.The present invention can significantly reduce substation grounding resistance, and contact electromotive force and step potential difference is reduced to below safety value, make high soil resistivity, exist water table System in Substation design it is easy, accurate and effective.
Description
Technical field
The present invention relates to System in Substation technical field, and in particular to a kind of reduction grounding resistance for beating ground connection deep-well
Method.
Background technology
Good earthed system is substation safety, the reliable, basic guarantee of stable operation, but domestic transformer station at present
The siting of station is due to needing to avoid good farmland, residential block, the soil such as economic development zone can use costly area, and site position is normal
The region that soil resistivity is high, geologic condition is poor is frequently located in, this just brings to System in Substation design and greatly chosen
War, it is therefore desirable to a reliable, earthed system for function admirable.
At present, domestic design of ground system is generally carried out using following steps：According to soil resistivity measured value, enter ground electricity
Stream maximum value, transformer station's areal calculation obtain grounding resistance, stand in contact electromotive force and step potential difference minimum value, with this
To judge grounded screen effect and successively using drop resistance measure, be so designed that method is higher to designer's skill requirement, especially
During in face of complex geological condition（Such as high soil resistivity, water table be present）, can not be accurately using the ground connection after drop resistance measure
Pessimistic concurrency control, it is even more not know where to begin that grounded screen resistance reducing effect is assessed in subregion, therefore for the sake of conservative, often intrepidly increases water
Ground net materials and the material usage of drop resistance measure are flushed, cause the waste of financial resource and material resource.
The content of the invention
It is an object of the invention to provide a kind of reduction grounding resistance method that ground connection deep-well mode is beaten in transformer station, makes high soil
Earth resistivity, exist water table System in Substation design it is easy, accurate and effective.
In the presence of solving the problems, such as background technology, the inventive method step is as follows：
(1) site soil resistivity measured value and water table depth are obtained, site soil is calculated using steepest descent method
Hierarchical mode；
(2) the engineering earth current maximum is calculated by transformer station's calculation of short-circuit current result, provides ground potential and rise ginseng
According to value, the safety value target component of calculated level grounded screen power frequency earthing resistance safety value, contact electromotive force and step potential difference；
(3) according to transformer station's area, material, equivalent redius and the mesh size of horizontal grounding net is initialized, is obtained horizontal
Grounded screen power frequency earthing resistance calculated value, contact electromotive force, step potential difference and ground potential rise calculated value；
(4) number is deviateed according to calculated value in substation location soil layering model, and step (2), step (3) and safety value
Amount, it is determined that ground connection deep-well quantity, position, well depth, vertical grounding electrode material and equivalent redius；
(5) calculate the ground potential liter for beating grounded screen after ground connection deep-well, power frequency earthing resistance calculated value, contact electromotive force and across
Whether step potential difference calculated value meets safety value in step (2), return to step (4) if being unsatisfactory for, adjustment ground connection deep-well parameter,
Until meeting safety value requirement；
(6) calculating of the station ground potential liter, four power frequency earthing resistance, contact electromotive force and step potential difference parameters is provided
Value and safety value, and the horizontal grounding net materials table of grounded screen, Grounding Grids material table.
The present invention can significantly reduce substation grounding resistance, and contact electromotive force and step potential difference is reduced to safety
Value is following, and the System in Substation design that make high soil resistivity, water table be present is easy, accurate and effective.
Brief description of the drawings：
Fig. 1 is the FB(flow block) of the inventive method；
Fig. 2 beats ground connection deep-well mode for this method use reduces grounding resistance schematic diagram.
Embodiment：
With reference to embodiment, the invention will be further described：
Embodiment 1, reference picture 1-2, embodiment 1 is by taking Anqing 110kV transformer stations as an example：
(1) System in Substation primary condition
1）Soil resistivity measured value and geological conditions,
The transformer station is located at Anqing Area, and area's size of standing is 48m × 81.5m, present position soil resistivity measured value compared with
Height, it is professional according to exploration such as table 1《Exploration of geotechnical engineering is reported》, our station ground ground 0.5m ~ 4.2m is silty clay, first meeting
Underground water buried depth is in 3.5 ~ 4.5m.
Table 1
2) horizontal grounding net initial parameter, such as table 2, it is 3.43kA to calculate earth current maximum.
Table 2
| The material of horizontal grounding net | Section (mm*mm) | Mesh size (m*m) | The depth of burying |
| Zinc-coated flat steel sheet | -50*6 | 6*6 | -0.8m |
3) soil layering model such as table 3 in site is calculated using steepest descent method：
Table 3
| The number of plies | Soil resistivity（ohm-m） | Layer depth (m) |
| 1 | 153.67 | 0.2 |
| 2 | 172.79 | 1.44 |
| 3 | 117.94 | 1.87 |
| 4 | 20 | 1 |
| 5 | 117.94 | +∞ |
(2) calculated value, the safety of horizontal grounding net power frequency earthing resistance, contact electromotive force and step potential difference is calculated
Value such as table 4：
Table 4
Note：When power frequency earthing resistance is unsatisfactory for safety value requirement, if ground potential rise less than 4000V and contact electromotive force and
Step potential difference meets safety value requirement, then also thinks that grounded screen meets safety value requirement.
(3) according to substation location soil layering model, and horizontal grounding net power frequency earthing resistance, contact electromotive force and across
Walk calculated value and safety value in potential difference and deviate quantity, it is determined that ground connection deep-well quantity, position, well depth, vertical grounding electrode material and
Equivalent redius, because our station power frequency earthing resistance and contact electromotive force can not meet safety value requirement, it is distributed according to water table
Situation, grounding resistance is reduced using ground connection deep-well method is beaten.
(4) parameters such as ground connection deep-well quantity, position, well depth, vertical grounding electrode material and equivalent redius are determined, such as table 5：
Table 5
(5) grounded screen is assessed, and is confirmed whether to meet safety value requirement, is referred to table 6：
Table 6
Ground connection deep-well by making a call to 4 mouthfuls of 50 meters of depths in four corners of transformer station can make contact electromotive force reach safety value will
Ask, and ground potential has been elevated to below 4000V, meet the safety value requirement noted in table 4, now think that this grounded screen meets peace
Total head requirement, the design is safe and reliable, economical.
(6) horizontal grounding net materials the table such as table 2, Grounding Grids material table 5 of the station grounded screen are provided, ground potential liter,
Power frequency earthing resistance, the calculated value of contact electromotive force and step potential difference and safety value such as table 6.
Presently preferred embodiments of the present invention is these are only, but protection scope of the present invention is not limited thereto, it is any to be familiar with sheet
Those skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in should all be covered
In protection scope of the present invention.
Claims (1)
1. the reduction grounding resistance method of ground connection deep-well mode is beaten in a kind of transformer station, it is characterised in that step is as follows：
(1) site soil resistivity measured value and water table depth are obtained, site soil layering is calculated using steepest descent method
Model；
(2) the engineering earth current maximum is calculated by transformer station's calculation of short-circuit current result, provides ground potential and rise reference point,
The safety value target component of calculated level grounded screen power frequency earthing resistance safety value, contact electromotive force and step potential difference；
(3) according to transformer station's area, material, equivalent redius and the mesh size of horizontal grounding net is initialized, obtains horizontal grounding
Net power frequency earthing resistance calculated value, contact electromotive force, step potential difference and ground potential rise calculated value；
(4) quantity is deviateed according to calculated value in substation location soil layering model, and step (2), step (3) and safety value,
It is determined that ground connection deep-well quantity, position, well depth, vertical grounding electrode material and equivalent redius；
(5) the ground potential liter of grounded screen after ground connection deep-well, power frequency earthing resistance calculated value, contact electromotive force and the electricity that strides are beaten in calculating
Whether potential difference calculated value meets safety value in step (2), return to step (4) if being unsatisfactory for, adjustment ground connection deep-well parameter, until
Meet safety value requirement；
(6) provide the station ground potential liter, power frequency earthing resistance, four parameters of contact electromotive force and step potential difference calculated value and
Safety value, and the horizontal grounding net materials table of grounded screen, Grounding Grids material table.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510942376.9A CN105375127B (en) | 2015-12-16 | 2015-12-16 | The reduction grounding resistance method of ground connection deep-well mode is beaten in a kind of transformer station |
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| CN201510942376.9A CN105375127B (en) | 2015-12-16 | 2015-12-16 | The reduction grounding resistance method of ground connection deep-well mode is beaten in a kind of transformer station |
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| CN105375127B true CN105375127B (en) | 2018-01-23 |
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| CN108020739B (en) * | 2017-11-29 | 2020-03-10 | 中国南方电网有限责任公司超高压输电公司广州局 | Method for reducing maximum current density of deep well grounding electrode |
| CN110082650A (en) * | 2019-03-19 | 2019-08-02 | 国网重庆市电力公司江津供电分公司 | A kind of devices and methods therefor suitable for the assessment of hydroscopic high-molecular resin resistance-lowering material resistance-reducing efficiency |
| CN112035990A (en) * | 2020-09-18 | 2020-12-04 | 国网湖南省电力有限公司 | Simulation system for deep well grounding electrode of extra-high voltage direct current transmission line |
| CN113047773A (en) * | 2021-03-15 | 2021-06-29 | 贵州电网有限责任公司 | Method for mounting vertical deep drilling buried grounding body |
| CN113608031B (en) * | 2021-08-04 | 2024-02-02 | 北京英瑞来科技有限公司 | Impact impedance monitoring method and device for substation lightning arrester |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE29619800U1 (en) * | 1996-11-14 | 1997-01-09 | Meissner & Wurst | Earthing device, especially for the clean room area |
| CN1237811A (en) * | 1999-07-09 | 1999-12-08 | 清华大学 | Method for reducing ground-resistance of transmission transformer station in area with high earth resistance |
| CN102856759A (en) * | 2011-06-28 | 2013-01-02 | 陕西电力科学研究院 | Resistance reducing method for grounding system |
| CN104699967A (en) * | 2015-03-10 | 2015-06-10 | 广东电网公司电力科学研究院 | Method for building simulation model equivalent to ion grounding electrode |
| CN104820144B (en) * | 2015-04-17 | 2018-05-25 | 国家电网公司 | Drop resistance analysis and measure system applied to Transformer Substation Lightning Protection earthed system |
| CN104901030B (en) * | 2015-06-09 | 2017-12-08 | 河北省电力勘测设计研究院 | A kind of transformer station's electric resistance reducing grounding device construction method |
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