CN110391634A - A kind of power network with lightning protection effect - Google Patents
A kind of power network with lightning protection effect Download PDFInfo
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- CN110391634A CN110391634A CN201810388985.8A CN201810388985A CN110391634A CN 110391634 A CN110391634 A CN 110391634A CN 201810388985 A CN201810388985 A CN 201810388985A CN 110391634 A CN110391634 A CN 110391634A
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- transmission line
- lightning
- shaft tower
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- electricity
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- 239000012212 insulator Substances 0.000 claims abstract description 17
- 239000004020 conductor Substances 0.000 claims description 20
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 2
- 230000001939 inductive effect Effects 0.000 abstract description 5
- 150000001875 compounds Chemical class 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 description 16
- 230000005684 electric field Effects 0.000 description 9
- 208000025274 Lightning injury Diseases 0.000 description 7
- 238000009413 insulation Methods 0.000 description 7
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- 238000000034 method Methods 0.000 description 3
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
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- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
- H02G13/80—Discharge by conduction or dissipation, e.g. rods, arresters, spark gaps
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- Suspension Of Electric Lines Or Cables (AREA)
Abstract
A kind of power network with lightning protection effect.It is made of step-up transformer (1), transmission pressure (2), insulator (3), support shaft tower (4) and step-down transformer (5) sequential connection, any lightning protection component, such as lightning conducter, line thunder protection device and shaft tower earth mat are not installed.When conducting wire is struck by lightning, conducting wire is to the charge inducing of lightning leader only on the two sides of conducting wire radial direction, and after thunder and lightning, the charge inducing at conducting wire radial direction both ends is compound, does not have any influence to transmission line of electricity.
Description
Technical field
The present invention relates to a kind of power network for transmitting electric energy, refer in particular to power transmission network and power distribution network.
Background technique
The electric energy of power plant production is needed by by transformation
Device, plain conductor, support conducting wire shaft tower and the molecular network of insulation that plain conductor insulate with shaft tower can just be given
It is used to user, many transformers, plain conductor, the shaft tower for supporting conducting wire and the insulator that plain conductor and shaft tower insulate
It is known as power network by the network of certain rule composition.Transmission line of electricity by plain conductor, support the shaft tower of conducting wire and by plain conductor
It is formed with the insulator of shaft tower insulation.Power network is divided into power transmission network and power distribution network by the different of function again.Power transmission network and power distribution network
There is no the difference of essence in composed structure, is all made of transformer, transmission line of electricity.
Power transmission network is the region that electric power is transported to electricity consumption from power plant, generally by step-up transformer, transmission line of electricity and drop
Pressure transformer is constituted.Network voltage is known as grid more than or equal to 35KV by China, and high-voltage AC transmission net carries out again
Subdivision, high pressure (Hv) are often referred to 35kV or more, 220kV and voltage class below: super-pressure (EHV) is often referred to 330kV
Or more, 1000kV voltage class below；Extra-high voltage (MW) refers to the voltage class of 1000kV or more.For direct current transportation,
Super-pressure is often referred to the voltage class such as ± 500 (± 400), ± 660kV；Extra-high voltage is often referred to ± 800kV and above.
Power distribution network refers to the electric power for sending power transmission network, is dispensed into user's use, generally refers to the power supply of 6-10KV voltage
System is made of transmission line of electricity and distribution transformer.The alternating current for the 6-10KV voltage that distribution transformer sends distribution line
It is transformed into the alternating current of 220V/380V for users to use.
Either power transmission network or power distribution network, the standard of all lightning protection are all to have charge to enter in Franklin's lightning stroke at present
It is formulated under the theoretical direction on ground, according to national standard " GB/Z24842-2009 1000kV ultra-high voltage AC input transformation engineering mistake
Voltage and Insulation Coordination ", " overvoltage protection and Insulation Coordination design specification of GB/T50064-2014 alternating-current electric device ",
" GB/50790-2013 ± 800kV direct-current overhead power transmission line design specification ", " GB/50665-2011 1000KV overhead power transmission
Route design specification ", " 110kV-750kV overhead transmission line design specification (GB/50545-2010) ", " GB/T 50065-
The grounding design specification of 2011 alternating-current electric devices " and State Grid Corporation of China's company standard " DL/T 436-2005 high voltage direct current frame
Empty power transmission sequence fire protection technology ", the relevant criterion of " Q/GDW11452-2015 Lightning Protection on Power Transmission Lines directive/guide " etc. and lead
Then, ultra-high-tension power transmission line will carry out anti-lightning strike design, and lightning conducter, coupling ground wire, various lightning-arrest is installed on high-tension line
Device and lightning rod etc. component carry out lightning protection, while requiring the ground resistance of the shaft tower of support power transmission line is 10~30 ohm,
This requirement is not achieved, the radial ground conductor of 500m is also no more than using 6~8 overall lengths of auxiliary, or using continuous
Extended ground conductor, ground resistance are unrestricted；So being fitted with lightning conducter on high voltage transmission line at present, shaft tower is equipped with ground
Net, some also build the independent lightning rod for being connected to earth mat.Such as " Q/GDW11452-2015 Lightning Protection on Power Transmission Lines directive/guide " the 7th
Chapter just proposes 6 kinds of line thunder protection measures: 7.1.1. aerial earth wire, 7.1.2. tower grounding device, 7.1.3. leakage conductor,
7.1.4. parallel connection gaps, 7.1.5. shaft tower lightning rod, 7.1.6. coupling ground wire." GB/T50064-2014 alternating-current electric device
Overvoltage protection and Insulation Coordination design specification " 5.4.8 fourth item regulation: 6KV~35KV transformer should be in all winding outlets
MOA (metal oxide arrester) above or under the conditions of being not more than 5 meters from transformer electrical distance is installed, at present the height of transformer
With regard to being all mounted with arrester on pressure side and low-pressure side, power network lightning protection measures are shown in attached drawing 1, in Fig. 1, coupling ground wire (1), bar
Tower lightning rod (2), insulator (4), lightning conducter (aerial earth wire) (5), conducting wire (6), leakage conductor (7), is taken shelter from the thunder at shaft tower (3)
Gap (8), radial ground conductor (9), shaft tower earth mat (10), high-voltage arrester (11), transformer (12), low voltage surge arrester
(13)。
In order to indicate power supply system by broken by lightning quantity number, power transmission network is provided in related specifications (standard) again
The tolerance index of " risk of shielding failure ", " trip-out rate " etc. broken by lightning, so-called " risk of shielding failure " refer to that lightning stroke is struck by lightning around lightning conducter
The probability of conducting wire, so-called " trip-out rate " refer to the probability that lightning surge causes line tripping to have a power failure, count according to power supply department, thunder
Hit trip accident caused by route accounts for the total accident of power grid 60% or more.
Thundercloud is medium without free electron, and according to the observation true to a large amount of lightning stroke, the time of lightning is only
Tens of microseconds, can be calculated within the time of lightning according to the charge density in thundercloud is that no charge enters ground from thundercloud
's.Thunder and lightning is since the aggregation of charged particle in thundercloud produces distortion electric field, according to the stream of the big the air gap breakdown of high voltage
Note is theoretical, and distortion electric field has punctured air and formd space positive charge group and plasma column, the thunder of high-speed camera shooting
The process photo of hitting shows that the distortion electric field that this space positive charge group generates continues to ionize air, and plasma column is just
Constantly extend, result in formation of the assembly of space positive charge group and plasma column, referred to as guide, due in lightning stroke, first
Leading is therefore also known as downward guide to the ground.Object on ground rolls into a ball the electric field to be formed by the space positive charge of downward guide
Induction generates negative electrical charge, and the field breakdown air formed when the amount of negative charge is enough equally also generates plasma column and sky
Between the assembly rolled into a ball of positive charge claim upward guide, guide moves closer to upwards downwards, when the space positive charge of downward upward guide
Potential difference between group arrives greatly is just struck by lightning when can puncture the air gap between them, at this time aerial all positive electricity
Lotus and electronics progress are compound, and the light that charge recombination issues just forms lightning, and thunder and lighting process just finishes.The Shanxi of in September, 2002
Wooden Pagoda at Yingxian County is struck by lightning, and enters the strong proof on ground when being exactly struck by lightning without charge.
After current power transmission net and power distribution network take various lightning protection measures, still do not prevent transmission line of electricity from being generated damage by lightning stroke
The phenomenon that bad and tripping, there is also damaged distribution transformer by lightning stroke.The case where causing anti-incessantly thunder and lightning damage, just
Be the various measures taken be with Franklin's thunder and lightning theory for guidance, for the purpose of so-called lightning current of releasing and carry out, but
They are all not meet thunder and lightning not have charge to enter actual, therefore can not prevent the damage of thunder and lightning not only, are also added simultaneously
Build maintenance cost.
Summary of the invention
In order to overcome the lightning protection of existing power transmission network and power distribution network insufficient, the present invention provides a kind of nature suitable for power network
Lightning protection law technology is not installed any thunder resisting equipment and is prevented on transmission pressure and transformer using the natural quality of thunder and lightning essence
Thunder component does not need installation lightning rod on shaft tower yet and builds earth mat, thus make transmission system not by the damage of thunder energy,
All windings of the distribution transformer of power distribution network not zinc oxide surge arresters, to make distribution system and user equipment not by thunder energy
Damage.Such lightning protection is simply easily achieved, cheap.
The technical solution adopted by the present invention to solve the technical problems is: one end of transmission pressure and step-up transformer it is defeated
Winding is connected out, and the other end of transmission pressure is connected with the input winding of step-down transformer, transmission pressure and line insulation
Son is connected, and line insulator is connected with shaft tower, and shaft tower is connected with its basis；Any lightning protection is not used to arrange on transmission line of electricity
It applies, not zinc oxide surge arresters on all windings of step up and step down transformer.According to the direction of electric charge induction principle and power line,
Gauss theorem points out that charge inducing amount is proportional to electric field strength and sensing area, close on high voltage transmission line when inductive lightning charge
Elder generation guide space positive charge side generates negative electrical charge downwards, and the side far from space positive charge generates positive charge, induced charge amount
Size submits to Gauss theorem；For example, thunder and lightning comes on the right of power transmission line, then negative electrical charge, In are just induced on the right side of power transmission line
Positive charge is just formed on the left of power transmission line, is formed an electric field inside such plain conductor to offset the generation of space positive charge
Electric field.Although there is positive and negative charge on power transmission line, since power transmission line and shaft tower are insulation, charge all on power transmission line,
External total electric field is zero, and insulator, would not be breakdown not by additional electric field action.It is defeated at the end of lightning stroke
Positive and negative charge on electric wire just carries out compound, and power transmission line is just without charge inducing, and such power transmission line is not just and one when being struck by lightning
Sample.
The beneficial effects of the present invention are: reducing the trip phenomenon because of the ultra-high-tension power transmission line that is struck by lightning, the construction of power network is reduced
Engineering cost reduces the maintenance cost of power network.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is current power network lightning protection measures figure
Fig. 2 is the principle of the present invention figure.
Fig. 3 is the cascade application of the principle of the invention
Fig. 4 is power circuit structural map of the invention.
Fig. 5 is transmission line of electricity and shaft tower structural map of the invention.
Fig. 6 is phase three-wire three transformer high-low-voltage wiring diagram of the invention.
In Fig. 1, coupling ground wire (1), shaft tower lightning rod (2), shaft tower (3), insulator (4), lightning conducter (aerial earth wire)
(5), conducting wire (6), leakage conductor (7), lightning-arrest gap (8), radial ground conductor (9), shaft tower earth mat (10), high-voltage arrester
(11), transformer (12), low voltage surge arrester (13).
In Fig. 2, step-up transformer (1), transmission pressure (2), insulator (3) support shaft tower (4), distribution transformer
(5)。
In Fig. 3, step-up transformer (1), transmission pressure (2), insulator (3) support shaft tower (4), distribution transformer
(5)。
In Fig. 4, support shaft tower (1), insulator (2) and transmission pressure (3).
In Fig. 5, pole and tower foundation (1), shaft tower (2), insulator (3), transmission pressure (4) and soil (5).
In Fig. 6, high-pressure side (1), transformer (2), low-pressure side (3).
Specific embodiment
In Fig. 2, step-up transformer (1), transmission pressure (2), insulator (3), shaft tower (4), step-down transformer (5) string
Even.
In Fig. 3, transmission pressure (2), insulator (3), shaft tower (4), step-down transformer (5) is needed to contact according to decompression
Application of the manystage cascade connection, such cascade can be multiple.
In Fig. 4, shaft tower (1), insulator (2) are connected with high voltage transmission line (3).Pole and tower foundation does not need to carry out special
Processing, meets the detailing requiments of building foundation, shaft tower, insulator and power transmission line meet existing relevant intensity requirement, lead
Electricity requires, and does not need particularly to be handled.The form of shaft tower can be with double rod gate, umbellate form tower, wine glass-shaped, cat head
Type, upper font, Guywire tower etc. are used to support the various supporting forms of transmission line of electricity.Power transmission line can be single conductor or Schizoid
Conducting wire.
In Fig. 5, pole and tower foundation (1), shaft tower (2), insulator (3) are connected with high voltage transmission line (4), pole and tower foundation (1)
It is built in soil (5).Pole and tower foundation does not need particularly to be handled, and meets the detailing requiments of building foundation, shaft tower, absolutely
Edge and power transmission line meet existing relevant intensity requirement, conductive requirement, do not need particularly to be handled.Shaft tower
Form can be used to support the various of transmission line of electricity with double rod gate, umbellate form tower, wine glass-shaped, cathead, upper font, Guywire tower etc.
Supporting form.Power transmission line can be single conductor or Schizoid conducting wire.
In Fig. 6 mesohigh side triple line (1), transformer (2), low-pressure side triple line (3) series connection, low-pressure side is also possible to three
Four line of phase.
Claims (10)
1. a kind of power network, transformer, plain conductor, insulator, support shaft tower are linked in sequence, it is characterized in that: on transmission line of electricity
Without using any lightning protection component, the shaft tower of transmission pressure is supported not need to build connected earth mat.
2. transmission line of electricity according to claim 1, it is characterized in that: in the top of transmission pressure without lightning conducter.
3. transmission line of electricity according to claim 1, it is characterized in that: in the top of transmission pressure without aerial earth wire.
4. transmission line of electricity according to claim 1 is connected it is characterized in that: not installing in the upper surface of transmission pressure with the earth
Leakage conductor, conducting wire can be solid conductor or multiconductor bundles.
5. transmission line of electricity according to claim 1 is connected it is characterized in that: not installing in the upper surface of transmission pressure with the earth
Parallel connection gaps, conducting wire can be solid conductor or multiconductor bundles.
6. transmission line of electricity according to claim 1, it is characterized in that: the shaft tower of support transmission pressure does not install earth mat, shaft tower
Form can be used to support each of transmission line of electricity with double rod gate, umbellate form tower, wine glass-shaped, cathead, upper font, Guywire tower etc.
Kind supporting form.
7. transmission line of electricity according to claim 1, it is characterized in that: the shaft tower of support power transmission line does not install lightning rod.
8. transmission line of electricity according to claim 1, it is characterized in that: not hookup wire road lightning rod on transmission pressure.
9. transmission line of electricity according to claim 1, it is characterized in that: coupling ground wire is not installed in the lower section of transmission pressure.
10. transformer according to claim 1, it is characterized in that: not zinc oxide surge arresters in all winding outlets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810388985.8A CN110391634A (en) | 2018-04-20 | 2018-04-20 | A kind of power network with lightning protection effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810388985.8A CN110391634A (en) | 2018-04-20 | 2018-04-20 | A kind of power network with lightning protection effect |
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| Publication Number | Publication Date |
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| CN110391634A true CN110391634A (en) | 2019-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810388985.8A Pending CN110391634A (en) | 2018-04-20 | 2018-04-20 | A kind of power network with lightning protection effect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300345A (en) * | 2021-06-15 | 2021-08-24 | 长沙理工大学 | Method and structure for adjusting insulation difference between single-phase parallel gap-added 10kV line and equipment |
-
2018
- 2018-04-20 CN CN201810388985.8A patent/CN110391634A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300345A (en) * | 2021-06-15 | 2021-08-24 | 长沙理工大学 | Method and structure for adjusting insulation difference between single-phase parallel gap-added 10kV line and equipment |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191029 |
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| RJ01 | Rejection of invention patent application after publication |