CN109257014A - A kind of photovoltaic plant reduces the method and structure of ground resistance - Google Patents
A kind of photovoltaic plant reduces the method and structure of ground resistance Download PDFInfo
- Publication number
- CN109257014A CN109257014A CN201811244899.6A CN201811244899A CN109257014A CN 109257014 A CN109257014 A CN 109257014A CN 201811244899 A CN201811244899 A CN 201811244899A CN 109257014 A CN109257014 A CN 109257014A
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- China
- Prior art keywords
- photovoltaic
- earth mat
- over
- counter portion
- earth
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- Pending
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000009413 insulation Methods 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 101100491335 Caenorhabditis elegans mat-2 gene Proteins 0.000 description 4
- 101100495256 Caenorhabditis elegans mat-3 gene Proteins 0.000 description 3
- 102100040428 Chitobiosyldiphosphodolichol beta-mannosyltransferase Human genes 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Photovoltaic Devices (AREA)
Abstract
The present invention relates to power station technical fields, disclose a kind of method that photovoltaic plant reduces ground resistance.Including following procedure: earth mat inside the over-the-counter portion's earth mat of photovoltaic and photovoltaic field being separated and keeps insulating；Three-core cable shielded layer inside across the over-the-counter portion's earth mat of photovoltaic and photovoltaic field between earth mat is single-end earthed；Two or more connecting pins are respectively set in the over-the-counter portion's earth mat of photovoltaic and photovoltaic plant booster stations region earth mat, two region earth mats are connected directly, using the over-the-counter increased area of portion's earth mat of photovoltaic as ground area is drawn outside, reduce the ground resistance in photovoltaic plant booster stations region.Technical solution of the present invention is provided with the over-the-counter portion's earth mat of a photovoltaic and internal earth mat, the over-the-counter portion's earth mat of the photovoltaic is only used as the outer of booster stations earth mat to draw ground connection to increase contact area, and then meet the limit value requirement of contact potential and step voltage, internal earth mat and external earth mat insulation, and then reduce the investment of internal earth mat.The invention also discloses the structures that a kind of photovoltaic plant reduces ground resistance.
Description
Technical field
The present invention relates to power station technical field, especially a kind of photovoltaic plant reduces the method and structure of ground resistance.
Background technique
The booster stations of photovoltaic plant are critical facilities in standing, and are disposed with voltage levels (110kV or more) power distribution equipment.
When short circuit occurs for system, biggish earth current can be generally generated, grounded screen current potential is caused to increase.Especially in high soil electricity
Resistance rate area, ground resistance is larger, and ground potential is higher when failure, and contact potential and step voltage are also higher, it is difficult to meet specification
It is required that therefore corresponding measure must be taken to reduce ground resistance as far as possible so that contact potential and step voltage meet code requirement.
There are two types of the current method for reducing photovoltaic plant ground resistance is general: (1) by photovoltaic plant booster stations earth mat and light
Volt place net connects, and ground resistance is reduced using the area that photovoltaic field increases, to make booster stations contact potential and stride
Requirement is more easily satisfied in voltage, but such scheme can make photovoltaic place net be connected with booster stations earth mat, thus it requires photovoltaic
Field areas also must satisfy the contact potential and step voltage limit value requirement in booster stations region, this needs larger investment for continuing
Increase ground reticular density (being not necessarily able to satisfy requirement increasing) or beat deep-well etc..(2) booster stations earth mat and photovoltaic place
Net separates, since electrical equipment is usually 35kV and following voltage class and without the outer neutral point of standing in photovoltaic field areas, this
It is smaller to enter earth fault electric current when the generation short trouble of region, generally only 200 A to 400A, earth mat resistance is invested without increase to be held very much
Easily just be able to satisfy requirement, but booster stations region due to area it is smaller, be difficult to meet the design requirement of contact potential and step voltage.
Summary of the invention
The technical problems to be solved by the present invention are: in view of the above problems, providing a kind of photovoltaic plant reduction
The method of ground resistance.
The technical solution adopted by the invention is as follows: a kind of method that photovoltaic plant reduces ground resistance, specifically includes following
Process:
Earth mat inside the over-the-counter portion's earth mat of photovoltaic and photovoltaic field is separated and keeps insulation；
Three-core cable shielded layer inside across the over-the-counter portion's earth mat of photovoltaic and photovoltaic field between earth mat is single-end earthed；
Two or more connecting pins, two regions are respectively set in the over-the-counter portion's earth mat of photovoltaic and photovoltaic plant booster stations region earth mat
Earth mat is connected directly, and using the over-the-counter increased area of portion's earth mat of photovoltaic as ground area is drawn outside the earth mat of booster stations region, is reduced
Photovoltaic plant booster stations region ground network ground resistance.
Further, photovoltaic field interior metal equipment and photovoltaic field inside earth mat keep being electrically connected, gold inside photovoltaic field
Belong to equipment not to be electrically connected with the over-the-counter portion's earth mat of photovoltaic.
The invention also discloses the structures that a kind of photovoltaic plant reduces ground resistance, including photovoltaic plant booster stations regions
Earth mat inside the over-the-counter portion's earth mat of net, photovoltaic, photovoltaic field, photovoltaic plant booster stations region earth mat pass through two or more companies
It connects end to connect with the over-the-counter portion's earth mat of photovoltaic, keeps insulating between earth mat inside the over-the-counter portion's earth mat of the photovoltaic and photovoltaic field, cross over
Three-core cable shielded layer inside the over-the-counter portion's earth mat of photovoltaic and photovoltaic field between earth mat is single-end earthed.
Compared with prior art, having the beneficial effect that by adopting the above technical scheme
(1) technical solution of the present invention is provided with the over-the-counter portion's earth mat of a photovoltaic, the photovoltaic over-the-counter portion's earth mat not with need to be grounded
Equipment connection reduces its ground resistance only as the outer area for drawing ground connection and increasing booster stations earth mat of booster stations earth mat, so as to
Meet the limit value requirement of booster stations earth mat contact potential and step voltage under investment condition few as far as possible.
(2) technical solution of the present invention is provided with earth mat inside a photovoltaic field, for equipment ground in photovoltaic field, the ground
Net need to keep insulating with the over-the-counter portion's earth mat of photovoltaic, and since area's device within the domain is 35kV and following equipment, which can invested
Meet the limit value requirement of contact potential and step voltage in very low situation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that photovoltaic plant of the present invention reduces ground resistance.
Specific embodiment
The present invention is described further with reference to the accompanying drawing.
A kind of method that photovoltaic plant reduces ground resistance, specifically includes following procedure:
Earth mat inside the over-the-counter portion's earth mat of photovoltaic and photovoltaic field is separated and keeps insulation；Across the over-the-counter portion's earth mat of photovoltaic and photovoltaic field
Three-core cable shielded layer between internal earth mat is single-end earthed；The over-the-counter portion's earth mat of photovoltaic is set with photovoltaic plant booster stations region earth mat
Two or more connecting pins are set, two region earth mats are connected directly, using the over-the-counter increased area of portion's earth mat of photovoltaic as liter
Draw ground connection outside the earth mat of pressure station.Draw ground connection increase booster stations for the over-the-counter portion's earth mat of photovoltaic as the outer of booster stations earth mat by this method
The area of earth mat reduces booster stations ground resistance, otherwise due to the connection of earth mat and booster stations earth mat inside photovoltaic field, internally
Net must satisfy the situation of booster stations region contact potential and step voltage limit value requirement, need the earth mat inside photovoltaic field at this time
Region beats deep-well or increases mesh grounding pole density, and cost is significantly greatly increased.
Preferably, photovoltaic field interior metal equipment and photovoltaic field inside earth mat keep being electrically connected, photovoltaic field interior metal
Equipment is not electrically connected with the over-the-counter portion's earth mat of photovoltaic.Photovoltaic field internal unit can be only by 35kV inside photovoltaic field areas and to divide into
Standby voltage class verifies contact potential, step voltage, is usually easily met requirement.
As shown in Figure 1, a kind of structure of photovoltaic plant reduction ground resistance, including photovoltaic plant booster stations region earth mat 1,
Earth mat 3 inside the over-the-counter portion's earth mat 2 of photovoltaic, photovoltaic field, photovoltaic plant booster stations region earth mat 1 pass through two or more companies
It connects end 4 connect with photovoltaic over-the-counter portion's earth mat 2, holding insulation between earth mat 3 inside the over-the-counter portion's earth mat 2 of the photovoltaic and photovoltaic field,
Single-end earthed across three-core cable shielded layer between the over-the-counter portion's earth mat 2 of photovoltaic and photovoltaic field inside earth mat 3.By this method by light
The outer area that draws ground connection increase booster stations earth mat of the over-the-counter portion's earth mat as booster stations earth mat is lied prostrate, booster stations local ground electricity is reduced
Resistance, and avoid that earth mat inside photovoltaic field must satisfy booster stations region contact potential and the higher of step voltage limit value is wanted
Ask, do not need photovoltaic field internally web area beat deep-well or increase mesh grounding pole density, reduce engineering cost.
Preferably, the structure that the photovoltaic plant reduces ground resistance further includes photovoltaic field interior metal equipment, the light
Lie prostrate earth mat inside field interior metal equipment electrical connection photovoltaic field.Photovoltaic field internal unit can only press photovoltaic field or photovoltaic field areas
Internal 35kV and following equipment voltage class verify contact potential, step voltage.
The invention is not limited to specific embodiments above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.If this
Field technical staff is altered or modified not departing from the unsubstantiality that spirit of the invention is done, should belong to power of the present invention
The claimed range of benefit.
Claims (3)
1. a kind of method that photovoltaic plant reduces ground resistance, which is characterized in that specifically include following procedure:
Earth mat inside the over-the-counter portion's earth mat of photovoltaic and photovoltaic field is separated and keeps insulation；
Three-core cable shielded layer inside across the over-the-counter portion's earth mat of photovoltaic and photovoltaic field between earth mat is single-end earthed；
Two or more connecting pins, two regions are respectively set in the over-the-counter portion's earth mat of photovoltaic and photovoltaic plant booster stations region earth mat
Earth mat is connected directly, and using the over-the-counter increased area of portion's earth mat of photovoltaic as ground area is drawn outside the earth mat of booster stations region, is reduced
Photovoltaic plant booster stations region ground network ground resistance.
2. the method that photovoltaic plant as described in claim 1 reduces ground resistance, which is characterized in that photovoltaic field interior metal is set
Standby to keep being electrically connected with earth mat inside photovoltaic field, photovoltaic field interior metal equipment is not electrically connected with the over-the-counter portion's earth mat of photovoltaic.
3. the structure that a kind of photovoltaic plant reduces ground resistance, which is characterized in that including photovoltaic plant booster stations region earth mat, light
Over-the-counter portion's earth mat, photovoltaic field inside earth mat are lied prostrate, photovoltaic plant booster stations region earth mat passes through two or more connecting pins
It is connect with the over-the-counter portion's earth mat of photovoltaic, keeps insulating between earth mat inside the over-the-counter portion's earth mat of the photovoltaic and photovoltaic field, across photovoltaic
Three-core cable shielded layer inside over-the-counter portion's earth mat and photovoltaic field between earth mat is single-end earthed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811244899.6A CN109257014A (en) | 2018-10-24 | 2018-10-24 | A kind of photovoltaic plant reduces the method and structure of ground resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811244899.6A CN109257014A (en) | 2018-10-24 | 2018-10-24 | A kind of photovoltaic plant reduces the method and structure of ground resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109257014A true CN109257014A (en) | 2019-01-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811244899.6A Pending CN109257014A (en) | 2018-10-24 | 2018-10-24 | A kind of photovoltaic plant reduces the method and structure of ground resistance |
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| Country | Link |
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| CN (1) | CN109257014A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102280726A (en) * | 2011-05-18 | 2011-12-14 | 湖南省电力公司科学研究院 | Method for reducing grounding resistance of grounding network with non-uniform soil resistivity |
| CN104901030A (en) * | 2015-06-09 | 2015-09-09 | 河北省电力勘测设计研究院 | Construction method of resistance reduction and grounding device of transformer station |
| CN209046586U (en) * | 2018-10-24 | 2019-06-28 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of photovoltaic plant reduces the structure of ground resistance |
-
2018
- 2018-10-24 CN CN201811244899.6A patent/CN109257014A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102280726A (en) * | 2011-05-18 | 2011-12-14 | 湖南省电力公司科学研究院 | Method for reducing grounding resistance of grounding network with non-uniform soil resistivity |
| CN104901030A (en) * | 2015-06-09 | 2015-09-09 | 河北省电力勘测设计研究院 | Construction method of resistance reduction and grounding device of transformer station |
| CN209046586U (en) * | 2018-10-24 | 2019-06-28 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of photovoltaic plant reduces the structure of ground resistance |
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