CN113594822A - Transformer substation engineering resistor grounding construction method - Google Patents
Transformer substation engineering resistor grounding construction method Download PDFInfo
- Publication number
- CN113594822A CN113594822A CN202110864568.8A CN202110864568A CN113594822A CN 113594822 A CN113594822 A CN 113594822A CN 202110864568 A CN202110864568 A CN 202110864568A CN 113594822 A CN113594822 A CN 113594822A
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- grounding
- vertical
- pile
- main
- galvanized steel
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- 238000010276 construction Methods 0.000 title claims abstract description 27
- 239000002689 soil Substances 0.000 claims abstract description 19
- 238000003466 welding Methods 0.000 claims abstract description 16
- 230000001680 brushing effect Effects 0.000 claims abstract description 4
- 239000003973 paint Substances 0.000 claims abstract description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 32
- 239000008397 galvanized steel Substances 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 13
- 239000004020 conductor Substances 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 238000005536 corrosion prevention Methods 0.000 claims description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
-
- 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 invention discloses a transformer substation engineering resistance grounding construction method which comprises the steps of surveying soil in a transformer substation area to obtain soil data, designing a grounding device comprising a vertical grounding body and a main grounding net according to the soil data, determining a first position of a cross point of a transverse main grounding net and a longitudinal main grounding net in the transformer substation area, driving a hollow pile driving pile body into the ground bottom at the first position by a pile driver to a preset depth, pulling out the pile driving pile body to form a pile hole in response to the pile driving pile body reaching the preset depth, installing the vertical grounding body in the pile hole, laying the main grounding net, welding the vertical grounding body and the main grounding net, performing anticorrosion treatment on the main grounding net, and grounding equipment and brushing a grounding mark paint. The invention shortens the construction time of resistance grounding, prolongs the service life of the grounding resistance and reduces the grounding resistance.
Description
Technical Field
The invention relates to the technical field of transformer substations, in particular to a transformer substation engineering resistor grounding construction method.
Background
The grounding network of the transformer substation is connected with the grounding wire of the high-low voltage electrical equipment of the whole substation, and the grounding network is a fundamental guarantee and an important measure for maintaining the safe and reliable operation of the transformer substation and ensuring the safe operation of the operators and the electrical equipment. If the grounding resistance is large, the ground potential may be abnormally increased when a power system ground fault or other large currents enter the ground, and if the grid design of the grounding grid is not reasonable, the potential distribution of the grounding system may be uneven, and the local potential exceeds the safety value regulation. This may threaten the safety of the operating personnel, and may also cause damage to low-voltage or secondary equipment and cable insulation due to counterattack, so that malfunction and failure of high-voltage entering control and protection systems and substation monitoring and protection equipment may occur.
Disclosure of Invention
In view of the defects in the prior art, the technical problem to be solved by the invention is to provide a transformer substation engineering resistor grounding construction method, aiming at shortening the construction time of resistor grounding, prolonging the service life of a grounding resistor and reducing the grounding resistor.
In order to achieve the purpose, the invention provides a transformer substation engineering resistor grounding construction method, which comprises the following steps: surveying soil in a transformer station area to obtain soil data, designing a grounding device comprising a vertical grounding body and a main grounding net according to the soil data, determining a first position where a cross point of the main grounding net transversely and longitudinally is located in the transformer station area, driving a hollow pile driving pile body into the ground bottom at the first position by a pile driver to a preset depth, responding to the pile driving pile body reaching the preset depth, pulling out the pile driving pile body to form a pile hole, installing the vertical grounding body in the pile hole, laying the main grounding net, welding the vertical grounding body and the main grounding net, performing anticorrosion treatment on the main grounding net, and grounding equipment and brushing a grounding mark paint.
In the process of embedding the vertical grounding body, a pit needs to be dug firstly, then the vertical grounding body is embedded, when the embedding depth is too large, the consumed time is too long, the construction progress is delayed, a large amount of manpower and material resources are wasted, and the construction difficulty is large; in the technical scheme, the vertical grounding body is directly arranged in the pile hole formed by being driven into the ground bottom by the pile driver, so that the construction time is greatly shortened, and the vertical grounding body is suitable for the construction condition that the embedding depth of the vertical grounding body is large; pile holes are formed by piling, so that the vertical grounding body is convenient to install, the striking frequency of the vertical grounding body is reduced, and the structural integrity of the vertical grounding body is protected; through the mode of piling, tamp the soil around the pile body of piling, reduce the resistivity of soil, and then reduce ground resistance.
In a specific embodiment, the vertical ground body comprises a vertical sleeve and a vertical ground conductor; the vertical grounding conductor is arranged in the vertical sleeve with a gap, and a resistance reducing agent is arranged in the gap; the wall of the vertical sleeve is provided with an oval through hole for enabling the resistance reducing agent to flow to the earth mat soil, and the long axis of the oval through hole is parallel to the axis of the vertical sleeve; the first end of the vertical sleeve is a closed end.
In the technical scheme, the vertical grounding conductor is arranged in the vertical sleeve, the vertical sleeve protects the vertical grounding conductor, and when the vertical grounding conductor has a fault, the vertical grounding conductor is convenient to replace; by arranging the resistance reducing agent in the gap, when the resistance of the vertical grounding body is increased due to external factors or improper construction, the grounding resistance can be further reduced; the oval through hole is set to be oval, so that when the vertical sleeve is used for piling in the axial direction, the oval through hole is deformed into a circle instead of being beaten into a flat oval, and meanwhile, the oval through hole (the long axis is in the same direction with the radial direction of the pile body) increases the axial anti-beating strength of the vertical sleeve.
In a specific embodiment, the external diameter of the piling body is the same as the external diameter of the vertical sleeve.
In the technical scheme, in the installation process of the vertical sleeve, the deformation rate of the oval through hole in the vertical sleeve is reduced due to the fact that the outer wall of the vertical sleeve is tightly attached to the inner wall of the pile hole.
In one embodiment, the vertical sleeve is driven into the pile bore by the pile driver.
In one embodiment, the predetermined depth is in a range of 10 to 12 m.
In one embodiment, the outer wall of the vertical sleeve is externally connected with a strip-shaped magnesium alloy.
In the technical scheme, the strip-shaped magnesium alloy and the vertical sleeve form a primary battery, the strip-shaped magnesium alloy is consumed due to oxidation reaction, the vertical sleeve is prevented from being corroded, and the service life of the vertical sleeve is prolonged.
In a specific embodiment, the method further comprises pre-burying excess vertical sleeves in the substation area.
In the technical scheme, when the grounding resistance is increased and the grounding resistance needs to be maintained, the vertical grounding conductor can be directly arranged in the redundant vertical sleeve, so that the aim of reducing the resistance is fulfilled, and the maintenance difficulty is reduced.
In a specific embodiment, the main grounding grid is made of galvanized steel materials in a transverse and longitudinal arrangement; the intervals between the galvanized steel materials which are transversely placed are different in size, and the intervals between the galvanized steel materials which are longitudinally placed are different in size; the position relationship between the adjacent cross points of the transversely placed galvanized steel and the longitudinally placed galvanized steel is opposite, namely, at the position of a first cross point, the transverse galvanized steel is at the upper part, the longitudinal galvanized steel is at the lower part, and at the position of the cross point adjacent to the first cross point, the transverse galvanized steel is at the lower part, and the longitudinal galvanized steel is at the upper part.
In the technical scheme, the main grounding grid is improved in overall toughness and stability by the fact that the upper position and the lower position of the transverse galvanized steel and the longitudinal galvanized steel at adjacent cross points are different, and the main grounding grid is prevented from being broken when accidents such as collapse occur in a transformer substation area.
In a specific embodiment, after welding is finished, removing residual welding flux at a welding part, removing rust on a welding surface and then performing anticorrosion treatment; the galvanized steel material should be also subjected to anticorrosion treatment at the zinc layer breakage part and the cut surface.
In a specific embodiment, when designing the grounding device comprising the vertical grounding body and the main grounding grid:
respectively calculating step voltage and contact potential under different laying conditions according to the ground current level of the transformer substation, and checking whether the step potential difference and the contact potential meet requirements; if the requirements are not met, adjusting the arrangement parameters and the structural parameters of the grounding grid to meet the requirements; wherein the arrangement parameters and the structural parameters include: the length of the vertical grounding body, the area size of the main grounding grid, the interval size of the transverse main grounding grid and the interval size of the longitudinal main grounding grid.
The invention has the beneficial effects that: in the process of embedding the vertical grounding body, a pit needs to be dug firstly, then the vertical grounding body is embedded, when the embedding depth is too large, the consumed time is too long, the construction progress is delayed, a large amount of manpower and material resources are wasted, and the construction difficulty is large; in the invention, the vertical grounding body is directly arranged in the pile hole formed by being driven into the ground bottom by the pile driver, so that the construction time is greatly shortened, and the vertical grounding body is suitable for the construction condition of large embedding depth of the vertical grounding body; pile holes are formed by piling, so that the vertical grounding body is convenient to install, the striking frequency of the vertical grounding body is reduced, and the structural integrity of the vertical grounding body is protected; through the mode of piling, tamp the soil around the pile body of piling, reduce the resistivity of soil, and then reduce ground resistance.
Drawings
Fig. 1 is a flow chart of a transformer substation engineering resistance grounding construction method according to an embodiment of the present invention;
fig. 2 is a diagram of the position relationship of the piling pile body, the vertical sleeve and the vertical grounding body in an embodiment of the invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1-2, in an embodiment of the present invention, a method for grounding a transformer substation engineering resistor includes: surveying soil in a transformer station area to obtain soil data, designing a grounding device comprising a vertical grounding body and a main grounding net according to the soil data, determining a first position where a cross point of the main grounding net transversely and longitudinally is located in the transformer station area, driving a hollow pile driving pile body into the ground bottom at the first position by a pile driver to a preset depth, responding to the pile driving pile body reaching the preset depth, pulling out the pile driving pile body to form a pile hole, installing the vertical grounding body in the pile hole, laying the main grounding net, welding the vertical grounding body and the main grounding net, performing anticorrosion treatment on the main grounding net, and grounding equipment and brushing a grounding mark paint.
It is worth mentioning that the vertical grounding body is made of stainless steel.
In this embodiment, the vertical ground body includes a vertical sleeve 100 and a vertical ground conductor 200; the vertical grounding conductor 200 is arranged in the vertical sleeve 100 with a gap, and a resistance reducing agent is arranged in the gap; the wall of the vertical sleeve 100 is provided with an oval through hole 101 for flowing the resistance reducing agent to the earth mat soil, and the long axis of the oval through hole 101 is parallel to the axis of the vertical sleeve 100; the first end of the vertical sleeve 100 is a closed end.
In this embodiment, the outer diameter of the piling body is the same as the outer diameter of the vertical sleeve 100.
In this embodiment, the vertical sleeve 100 is driven into the pile hole by the pile driver.
In this embodiment, the predetermined depth is in a range of 10 to 12 m.
In this embodiment, the outer wall of the vertical sleeve 100 is circumscribed by a strip-shaped magnesium alloy.
In this embodiment, the method further comprises pre-burying the excess vertical sleeve 100 in the substation area.
In this embodiment, the main grounding grid is made of galvanized steel material placed horizontally and vertically; the intervals between the galvanized steel materials which are transversely placed are different in size, and the intervals between the galvanized steel materials which are longitudinally placed are different in size; the position relationship between the adjacent cross points of the transversely placed galvanized steel and the longitudinally placed galvanized steel is opposite, namely, at the position of a first cross point, the transverse galvanized steel is at the upper part, the longitudinal galvanized steel is at the lower part, and at the position of the cross point adjacent to the first cross point, the transverse galvanized steel is at the lower part, and the longitudinal galvanized steel is at the upper part.
In the embodiment, after welding, the residual welding flux at the welding part is removed, and the welding surface is subjected to rust removal and then subjected to corrosion prevention treatment; the galvanized steel material should be also subjected to anticorrosion treatment at the zinc layer breakage part and the cut surface.
In this embodiment, when designing the grounding device including the vertical grounding body and the main grounding grid:
respectively calculating step voltage and contact potential under different laying conditions according to the ground current level of the transformer substation, and checking whether the step potential difference and the contact potential meet requirements; if the requirements are not met, adjusting the arrangement parameters and the structural parameters of the grounding grid to meet the requirements; wherein the arrangement parameters and the structural parameters include: the length of the vertical grounding body, the area size of the main grounding grid, the interval size of the transverse main grounding grid and the interval size of the longitudinal main grounding grid.
Specific embodiments of the present invention have been described above in detail. It is to be understood that the specific embodiments of the present invention are not exclusive and that modifications and variations may be made by one of ordinary skill in the art in light of the spirit of the present invention, within the scope of the appended claims. Therefore, technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the embodiments of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A transformer substation engineering resistor grounding construction method is characterized by comprising the following steps: surveying soil in a transformer station area to obtain soil data, designing a grounding device comprising a vertical grounding body and a main grounding net according to the soil data, determining a first position where a cross point of the main grounding net transversely and longitudinally is located in the transformer station area, driving a hollow pile driving pile body into the ground bottom at the first position by a pile driver to a preset depth, responding to the pile driving pile body reaching the preset depth, pulling out the pile driving pile body to form a pile hole, installing the vertical grounding body in the pile hole, laying the main grounding net, welding the vertical grounding body and the main grounding net, performing anticorrosion treatment on the main grounding net, and grounding equipment and brushing a grounding mark paint.
2. The substation engineering resistance grounding construction method of claim 1, wherein the vertical grounding body comprises a vertical sleeve and a vertical grounding conductor; the vertical grounding conductor is arranged in the vertical sleeve with a gap, and a resistance reducing agent is arranged in the gap; the wall of the vertical sleeve is provided with an oval through hole for enabling the resistance reducing agent to flow to the earth mat soil, and the long axis of the oval through hole is parallel to the axis of the vertical sleeve; the first end of the vertical sleeve is a closed end.
3. The transformer substation engineering resistance grounding construction method according to claim 2, wherein the size of the outer diameter of the pile driving pile body is the same as that of the vertical sleeve.
4. The substation engineering resistance grounding construction method of claim 3, wherein the vertical sleeve is driven into the pile hole by the pile driver.
5. The transformer substation engineering resistance grounding construction method according to claim 1, wherein the predetermined depth is in a range of 10-12 m.
6. The transformer substation engineering resistance grounding construction method according to claim 1, wherein a strip-shaped magnesium alloy is externally connected to the outer wall of the vertical sleeve.
7. The method of claim 1, further comprising pre-burying excess vertical sleeves in the substation area.
8. The transformer substation engineering resistance grounding construction method according to claim 1, wherein the main grounding grid is composed of galvanized steel in transverse and longitudinal arrangement; the intervals between the galvanized steel materials which are transversely placed are different in size, and the intervals between the galvanized steel materials which are longitudinally placed are different in size; the position relationship between the adjacent cross points of the transversely placed galvanized steel and the longitudinally placed galvanized steel is opposite, namely, at the position of a first cross point, the transverse galvanized steel is at the upper part, the longitudinal galvanized steel is at the lower part, and at the position of the cross point adjacent to the first cross point, the transverse galvanized steel is at the lower part, and the longitudinal galvanized steel is at the upper part.
9. The transformer substation engineering resistance grounding construction method according to claim 8, characterized in that after welding is finished, residual welding flux at a welding part is removed, rust is removed from the welding surface, and then corrosion prevention treatment is carried out; the galvanized steel material should be also subjected to anticorrosion treatment at the zinc layer breakage part and the cut surface.
10. The substation engineering resistance grounding construction method of claim 1, wherein when designing the grounding device comprising the vertical grounding body and the main grounding grid:
respectively calculating step voltage and contact potential under different laying conditions according to the ground current level of the transformer substation, and checking whether the step potential difference and the contact potential meet requirements; if the requirements are not met, adjusting the arrangement parameters and the structural parameters of the grounding grid to meet the requirements; wherein the arrangement parameters and the structural parameters include: the length of the vertical grounding body, the area size of the main grounding grid, the interval size of the transverse main grounding grid and the interval size of the longitudinal main grounding grid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110864568.8A CN113594822B (en) | 2021-07-29 | 2021-07-29 | Transformer substation engineering resistor grounding construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110864568.8A CN113594822B (en) | 2021-07-29 | 2021-07-29 | Transformer substation engineering resistor grounding construction method |
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| CN113594822A true CN113594822A (en) | 2021-11-02 |
| CN113594822B CN113594822B (en) | 2024-04-19 |
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| CN109713540A (en) * | 2019-01-02 | 2019-05-03 | 湖南长高售电有限公司 | A kind of vertical deep grounding resistance-reducing method of grid equipment grounded screen copper plated steel |
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| CN112038786A (en) * | 2020-09-27 | 2020-12-04 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Distribution grounding type graphene grounding device |
| CN213071409U (en) * | 2020-09-01 | 2021-04-27 | 广州市宇田气象科技服务有限公司 | High lightning protection device of security |
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2021
- 2021-07-29 CN CN202110864568.8A patent/CN113594822B/en active Active
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| CN201191652Y (en) * | 2007-11-20 | 2009-02-04 | 李黔鲁 | Strongly resistance reducing earthing module |
| JP2011111787A (en) * | 2009-11-26 | 2011-06-09 | Nomu:Kk | Soil improvement construction method |
| JP2011222382A (en) * | 2010-04-13 | 2011-11-04 | Chugoku Electric Power Co Inc:The | Rotary ground electrode device and foundation pile |
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| CN111048919A (en) * | 2019-12-24 | 2020-04-21 | 嘉兴恒创电力设计研究院有限公司 | Energy station grounding grid in high-soil-resistivity area and resistance reduction optimization method thereof |
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| Publication number | Publication date |
|---|---|
| CN113594822B (en) | 2024-04-19 |
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