CN109243728A - A kind of DC gas insulated metal enclosed electric transmission line isolator - Google Patents
A kind of DC gas insulated metal enclosed electric transmission line isolator Download PDFInfo
- Publication number
- CN109243728A CN109243728A CN201811400756.XA CN201811400756A CN109243728A CN 109243728 A CN109243728 A CN 109243728A CN 201811400756 A CN201811400756 A CN 201811400756A CN 109243728 A CN109243728 A CN 109243728A
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- Prior art keywords
- transmission line
- insulating part
- insulated metal
- gas insulated
- insulator
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/38—Fittings, e.g. caps; Fastenings therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulators (AREA)
- Insulating Bodies (AREA)
Abstract
The application belongs to power technology equipment manufacturing technology field, more particularly to a kind of DC gas insulated metal enclosed electric transmission line isolator.Surface is easy Accumulating charge to existing disc insulator at a dc voltage, and surface charge accumulation will lead to internal field's distortion, so that insulator is easier that edge flashing occurs.The application provides a kind of DC gas insulated metal enclosed electric transmission line isolator, including central inserts, is provided with insulating part on the outside of the center inserts, is provided with flange on the outside of the insulating part；The insulating part includes first surface and second surface, the first surface and the second surface axial symmetry in the horizontal direction.It balances along face is tangential and normal component, so that substantially reduce normal direction field strength in the case where tangential field is met the requirements, to realize significantly inhibiting for the charge buildup of insulator surface under direct current.
Description
Technical field
The application belongs to power technology equipment manufacturing technology field, more particularly to a kind of DC gas insulated metal
Closed power transmission line insulator.
Background technique
The transmission and power transformation of electric energy, distribution, electricity consumption together, constitute the allomeric function of electric system, are electric system entirety
The important composition link of function.Power plant and power load center are generally all located at different regions, by transmission of electricity, far apart
(up to thousands of millimeters) power plant and load center connect, so that the development and utilization of electric energy is surmounted the limitation of region.?
Power plant is established in the suitable place of the non-renewable energy resources supplIes such as waterpower, coal, can be delivered the power to by transmission of electricity separate
The load center in power plant makes the development and utilization of electric energy surmount the limitation of region.
Gas-insulated metal closed power transmission line (Gas-insulated transmission lines, abbreviation GIL) packet
Include direct current GIL with exchange GIL.At a dc voltage, electric in gas-insulated metal closed power transmission line concentric cylinder gas gap
Field is constant, and field distribution depends on the shape and conductivity of solid insulating material, and the conductivity of insulating materials is in very great Cheng
It is influenced on degree by factors such as temperature, electric field strength and pressing times.
Electric current is transmitted by power transfer conduit, uses disc insulator, existing benzvalene form insulation in power transfer conduit mostly
Surface is easy Accumulating charge to son at a dc voltage, and surface charge accumulation will lead to internal field's distortion, so that insulator is more
It is easy to happen edge flashing.
Summary of the invention
1. technical problems to be solved
It is transmitted based on electric current by power transfer conduit, uses disc insulator, existing benzvalene form in power transfer conduit mostly
Surface is easy Accumulating charge to insulator at a dc voltage, and surface charge accumulation will lead to internal field's distortion, so that insulation
Son is easier the problem of edge flashing occurs, and this application provides a kind of DC gas insulated metal enclosed transmission line insulators
Son, charge buildup is few, and flashover voltage is higher than the prior art, and security and stability is more preferable.
2. technical solution
To achieve the above object, this application provides a kind of DC gas insulated metal enclosed transmission line insulators
Son, including central inserts, center inserts outside are provided with insulating part, are provided with flange on the outside of the insulating part；
The insulating part includes first surface and second surface, and the first surface and the second surface are in the horizontal direction
Axial symmetry.
Optionally, the first surface includes sequentially connected first cambered surface, the second cambered surface and third cambered surface, and described first
It is provided with the first angle between cambered surface and the second cambered surface, is provided with the second folder between second cambered surface and the third cambered surface
Angle, first angle are identical as second corner dimension.
Optionally, first angle is 165 °, and second angle is 165 °.
Optionally, the insulating part is epoxy resin compound inslation part, and the resistivity of the insulating part is 1017Ω·cm。
Optionally, the central inserts is connected with central conductor.
Optionally, it is provided with through-hole on the central inserts, the quantity of the through-hole is 4.
3. beneficial effect
Compared with prior art, a kind of DC gas insulated metal enclosed electric transmission line isolator provided by the present application:
A kind of DC gas insulated metal enclosed electric transmission line isolator provided by the present application, including central inserts, center
It is provided with insulating part on the outside of inserts, is provided with flange on the outside of insulating part；Insulating part includes first surface and second surface, the first table
Face and second surface axial symmetry in the horizontal direction；The first surface of insulating part and second surface axial symmetry in the horizontal direction, balance
Along face is tangential and normal component, so that normal direction field strength is substantially reduced in the case where tangential field is met the requirements, to realize
The charge buildup of insulator surface significantly inhibits under direct current.Meanwhile the insulating part in the application uses resistivity 1017Ω·cm
The epoxy resin composite material of magnitude also functions to and significantly inhibits effect to the charge buildup on Insulator Under DC Voltage surface.
Detailed description of the invention
Fig. 1 is a kind of cross-sectional view of DC gas insulated metal enclosed electric transmission line isolator of the application；
Fig. 2 is a kind of top view of DC gas insulated metal enclosed electric transmission line isolator of the application；
In figure: the center 1- inserts, 2- insulating part, 3- flange, 4- first surface, 5- second surface, the first cambered surface of 6-, 7-
Two cambered surfaces, 8- third cambered surface, the first angle of 9-, the second angle of 10-, 11- through-hole.
Specific embodiment
Hereinafter, specific embodiment of the reference attached drawing to the application is described in detail, it is detailed according to these
Description, one of ordinary skill in the art can implement the application it can be clearly understood that the application.Without prejudice to the application principle
In the case where, the feature in each different embodiment can be combined to obtain new embodiment, or be substituted certain
Certain features in embodiment, obtain other preferred embodiments.
Centrosymmetric image: planar, a figure around some 180 ° of point rotation, if postrotational figure energy
It is overlapped with original figure, then this figure is called centrosymmetric image, this puts the symmetrical centre for being called it.
Axial symmetry: folding a figure along certain straight line, if the part of straight line both sides can mutually coincide, that
Claiming this figure is zhou duicheng tuxing (symmetric figure), this straight line is exactly symmetry axis.
Referring to Fig. 1~2, the application provides a kind of DC gas insulated metal enclosed electric transmission line isolator, including center
Inserts 1, it is described center inserts 1 on the outside of be provided with insulating part 2, be provided with flange 3 on the outside of the insulating part 2；
The insulating part 2 includes first surface 4 and second surface 5, and the first surface 4 and the second surface 5 are along water
Square to axial symmetry.Here first surface 4 refers to 2 front of insulating part, and second surface 5 refers to 2 reverse side of insulating part, tow sides
Camber is 0 °, and two sides is the same；That is tow sides are symmetrical, i.e. the first table along the central axes of horizontal direction
Axial symmetry, insulating part 2 are the zhou duicheng tuxing of horizontal direction in the horizontal direction for face 4 and second surface 5.It is entire DC gas insulated
Metal closed power transmission line insulator cross section is a centrosymmetric image.Since front and back sides camber is 0 °, so that entirely
DC gas insulated metal enclosed electric transmission line isolator substantially reduces normal direction field in the case where tangential field is met the requirements
By force, to realize significantly inhibiting for the charge buildup on disc insulator surface under direct current.
Optionally, the first surface 4 includes sequentially connected first cambered surface 6, the second cambered surface 7 and third cambered surface 8, described
It is provided with the first angle 9 between first cambered surface 6 and the second cambered surface 7, is arranged between second cambered surface 7 and the third cambered surface 8
There is the second angle 10, first angle 9 is identical as 10 size of the second angle.It further illustrates, the camber of front and back sides
It is 0 °.
Optionally, first angle 9 is 165 °, and second angle 10 is 165 °.
Optionally, the insulating part 2 is epoxy resin compound inslation part, and the resistivity of the insulating part 2 is 1017Ω·
cm.Here insulating part 2 uses resistivity 1017The epoxy resin composite material of Ω cm magnitude, compared to conventional insulators, electricity
Resistance rate is substantially improved, the heteropolarity lightning impulse voltage effect lower edge after inhibiting charge buildup, electric field that should be saturated with charge buildup
The tangential electric field strength in face is Appreciation gist.
Optionally, the central inserts 1 is connected with central conductor.
Optionally, it is provided with through-hole 11 on the central inserts 1, the quantity of the through-hole 11 is 4.
The application also provides a kind of direct current transportation pipeline, is provided in the direct current transportation pipeline described DC gas insulated
Metal closed power transmission line insulator.
Optionally, it is provided with insulating gas in the direct current transportation pipeline, the insulating gas includes SF6/N2Mixed gas
Or C3F7CN/CO2Mixed gas.SF6Gas has very strong greenhouse effects, and limitation is clearly classified as by Kyoto Protocol to be made
Insulating gas, SF6/N2Mixed gas uses N2Buffering, greatly reduces SF6Dosage.
Optionally, the SF6/N2Mixed gas air pressure is 0.7MPa, the SF6/N2SF in mixed gas6It is 20%, institute
State N2It is 80%.
Optionally, the C3F7CN/CO2Mixed gas air pressure is 0.6~0.7MPa, the C3F7CN/CO2In mixed gas
C3F7CN is 8%, the CO2It is 92%.
Optionally, the direct current transportation pipeline includes resistance to pressure cylinder, and the DC gas insulated metal enclosed transmission line of electricity is exhausted
Edge is connected with the resistance to pressure cylinder.
Direct current transportation can be greatly decreased occupied area, save the cost and for gas insulation electric power line route it is this defeated
Electric mode, the associated equipment under direct current is industrially there are no beginning to use, so this there is presently no direct current transportation is adapted to
The particular/special requirement of form.
Insulator is divided into two kinds of forms of disc insulator and support insulator, the application be to traditional disc insulator into
Capable improvement.
This application involves direct current transportation pipeline, it is 210 millimeters in shell that conductor diameter, which is 60 millimeters, thickness of shell
It is 8 millimeters；DC gas insulated metal enclosed electric transmission line isolator diameter used in this application is 210 millimeters, while direct current
Support insulator is used in power transfer conduit, outer diameter is 210 millimeters, and three pillars are arranged symmetrically, and the insulating part of support insulator is also adopted
With resistivity 1017The epoxy resin composite material of Ω cm magnitude is made；Particulate trap is thick wide than being 0.8, is mounted on away from exhausted
The position of edge 4cm~12cm, catch rate success rate is up to 50% or more.
Utilize the concrete principle and method of Dynamics Simulation Model optimization design D.C. isolation part
Research shows that modified by Shape optimization designs and insulating materials, balanced insulation is along face normal direction field strength and tangential field
Its insulation performance can be effectively improved by force.The DC Insulator surface charge accumulation multiple physical field coupling established based on early-stage study
Simulation model calculates under direct current electric stress and thermal stress coupling, and insulating materials bulk conductivity is for surface Charge
Accumulation characteristic and affecting laws along face field distribution establish theoretical base for the optimization design of direct current GIL insulator dielectric material
Plinth.
From simulation result as can be seen that insulator upper and lower surface mainly gathers positive charge, and it is distributed similar.When benzvalene form is exhausted
Edge daughter conductivity is by kvIncrease to 10kvWhen, in upper and lower surfaces in guide rod region, surface Charge density is therewith
Increase；If continuing to increase bulk conductivity to 100kv, it is 10k compared to bulk conductivityvWhen stable state distribution of charges, disc insulator
Upper and lower surfaces distribution of charges rule and Accumulating charge density almost no longer change.When disc insulator bulk conductivity is by kvReduce
To 0.1kvWhen, upper and lower surfaces charge density, which has, slightly to be reduced；If continuing to reduce disc insulator bulk conductivity to 0.01kv,
It is substantially reduced in upper and lower surfaces Accumulating charge density, and negative polarity is become from positive polarity close to centre pilot segment polarity, it is maximum
Charge density reduces 52.9%；When disc insulator bulk conductivity continues to be decreased to 0.001kvWhen, the area close near centre pilot
Domain will largely gather negative polarity charge, and being apparently higher than bulk conductivity is 0.01kvWhen the case where.
It is k for surface conductivity according to above-mentioned simulation results, bulk conductivity kvDisc insulator in DC stress
Under the charge buildup distribution situation of upper and lower surface determine that therefore insulator surface gathers positive charge by body conductance.Work as surface area
When poly- positive charge, the normal component J of the current density of insulator is flowed throughInReduce, passes through gas JGnCurrent density normal direction point
It measures and the electric current J along insulator surfaceτnIncrease.Limit is JIn-JGn-Jτn=0.Due to JInMuch larger than other amounts, only
As insulator side normal electric field intensity EInBeing reduced to very hour can be only achieved stable state.
With further increasing for bulk conductivity, surface Charge density increases with bulk conductivity and is increased.However,
JGnAnd JτnAlso with surface charge increase and increase.Therefore, surface Charge density not with bulk conductivity proportionally
Increase.Even if can be seen that insulator bulk conductivity increases by two orders of magnitude, surface charge almost no longer changes.On the contrary, if
Insulator bulk conductivity reduces very much, and leading charge buildup mechanism becomes along insulator surface conduction, and the charge gathered
Negative polarity is become from positive polarity.
It therefore can be by reducing the surface charge accumulation on bulk conductivity reduction disc insulator.But bulk conductivity is not answered
Reduce excessively, otherwise surface charge accumulation will become negative polarity from positive polarity, and tangential electric field strength dramatically increases；In direct current
In the modification of insulator dielectric material, bulk conductivity should reduce by two orders of magnitude.As selection gist, room temperature lower body is selected
Resistivity > 1 × 1017The epoxy resin composite material of Ω m is poured materials as direct current disc insulator.By above-mentioned material electricity
It learns parameter and substitutes into proposed charge buildup simulation model, and insulator geometry function is established based on Bessel equation.
A kind of DC gas insulated metal enclosed electric transmission line isolator provided by the present application, including central inserts 1, center
It is provided with insulating part 2 on the outside of inserts 1, flange 3 is provided on the outside of insulating part 2；Insulating part 2 includes first surface 4 and second surface
5, first surface 4 and second surface 5 axial symmetry in the horizontal direction；The first surface 4 and second surface 5 of insulating part 2 are along level side
To axial symmetry, balance along face is tangential and normal component, so that substantially reducing normal direction in the case where tangential field is met the requirements
Field strength, to realize significantly inhibiting for the charge buildup of insulator surface under direct current.Meanwhile the insulating part 2 in the application uses
Resistivity 1017The epoxy resin composite material of Ω cm magnitude, also functions to the charge buildup to Insulator Under DC Voltage surface
Significantly inhibit effect.After shape and material are combined, effect is more significant.SF is used in direct current transportation pipeline6/N2
Mixed gas, using N2Buffering, greatly reduces SF6Dosage so that direct current transportation pipeline is more environmentally-friendly.Furthermore direct current transportation
Pipeline does not incude fever in power transfer conduit shell, and heat transfer property is substantially improved, and temperature rise is greatly decreased, therefore, according to direct current gas
The insulation performance of body insulation metal closed transmission line of electricity and the difference of alternating current-direct current calorific value are converted, and transmission of electricity can be suitably reduced
Line size reduces cost compared to identical voltage class size reduction 23%, saves space.
Although the application is described above by referring to specific embodiment, one of ordinary skill in the art are answered
Work as understanding, in principle disclosed in the present application and range, many modifications can be made for configuration disclosed in the present application and details.
The protection scope of the application is determined by the attached claims, and claim is intended to technical characteristic in claim
Equivalent literal meaning or range whole modifications for being included.
Claims (6)
1. a kind of DC gas insulated metal enclosed electric transmission line isolator, it is characterised in that: described including central inserts (1)
It is provided with insulating part (2) on the outside of central inserts (1), is provided with flange (3) on the outside of the insulating part (2)；
The insulating part (2) includes first surface (4) and second surface (5), the first surface (4) and the second surface
(5) axial symmetry in the horizontal direction.
2. DC gas insulated metal enclosed electric transmission line isolator as described in claim 1, it is characterised in that: described first
Surface (4) includes sequentially connected first cambered surface (6), the second cambered surface (7) and third cambered surface (8), first cambered surface (6) and the
It is provided between two cambered surfaces (7) the first angle (9), is provided with second between second cambered surface (7) and the third cambered surface (8)
Angle (10), first angle (9) are identical as the second angle (10) size.
3. DC gas insulated metal enclosed electric transmission line isolator as claimed in claim 2, it is characterised in that: described first
Angle (9) is 165 °, and second angle (10) is 165 °.
4. DC gas insulated metal enclosed electric transmission line isolator according to any one of claims 1 to 3, feature exist
In: the insulating part (2) is epoxy resin compound inslation part, and the resistivity of the insulating part (2) is 1017Ω·cm。
5. DC gas insulated metal enclosed electric transmission line isolator as described in claim 1, it is characterised in that: the center
Inserts (1) is connected with central conductor.
6. DC gas insulated metal enclosed electric transmission line isolator as described in claim 1, it is characterised in that: the center
It is provided on inserts (1) through-hole (11), the quantity of the through-hole (11) is 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811400756.XA CN109243728B (en) | 2018-11-22 | 2018-11-22 | Direct current gas insulated metal enclosed transmission line insulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811400756.XA CN109243728B (en) | 2018-11-22 | 2018-11-22 | Direct current gas insulated metal enclosed transmission line insulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109243728A true CN109243728A (en) | 2019-01-18 |
| CN109243728B CN109243728B (en) | 2020-11-10 |
Family
ID=65075834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811400756.XA Active CN109243728B (en) | 2018-11-22 | 2018-11-22 | Direct current gas insulated metal enclosed transmission line insulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109243728B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112670040A (en) * | 2020-11-20 | 2021-04-16 | 华北电力大学 | Ceramic post insulator for gas-insulated high-voltage electrical equipment |
| CN114334306A (en) * | 2020-10-09 | 2022-04-12 | 西安西电高压开关有限责任公司 | Insulator assembly |
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| CN203232763U (en) * | 2013-04-10 | 2013-10-09 | 南京南瑞太阳能科技有限公司 | A low-voltage insulator with an adjusted center |
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| JP5593158B2 (en) * | 2010-08-10 | 2014-09-17 | 株式会社オーク製作所 | Discharge lamp |
| CN105513723A (en) * | 2016-01-29 | 2016-04-20 | 麦克奥迪（厦门）电气股份有限公司 | Basin-type insulator and manufacturing process thereof |
| CN108736121A (en) * | 2018-06-01 | 2018-11-02 | 西安京工智鑫电磁技术有限责任公司 | Flexible high pressure coaxial pulse transmission line and its method based on braiding structure conductor layer |
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2018
- 2018-11-22 CN CN201811400756.XA patent/CN109243728B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5593158B2 (en) * | 2010-08-10 | 2014-09-17 | 株式会社オーク製作所 | Discharge lamp |
| CN103765710A (en) * | 2011-09-02 | 2014-04-30 | Abb研究有限公司 | Insulator for high-voltage gas insulated switch gear |
| CN102780196A (en) * | 2012-08-08 | 2012-11-14 | 沈阳华德海泰电器有限公司 | Disc-type bus sleeve |
| CN203232763U (en) * | 2013-04-10 | 2013-10-09 | 南京南瑞太阳能科技有限公司 | A low-voltage insulator with an adjusted center |
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| CN108736121A (en) * | 2018-06-01 | 2018-11-02 | 西安京工智鑫电磁技术有限责任公司 | Flexible high pressure coaxial pulse transmission line and its method based on braiding structure conductor layer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114334306A (en) * | 2020-10-09 | 2022-04-12 | 西安西电高压开关有限责任公司 | Insulator assembly |
| CN114334306B (en) * | 2020-10-09 | 2024-01-26 | 西安西电高压开关有限责任公司 | Insulator assembly |
| CN112670040A (en) * | 2020-11-20 | 2021-04-16 | 华北电力大学 | Ceramic post insulator for gas-insulated high-voltage electrical equipment |
| CN112670040B (en) * | 2020-11-20 | 2022-09-09 | 华北电力大学 | Ceramic post insulator for gas insulated high-voltage electrical equipment |
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| CN109243728B (en) | 2020-11-10 |
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