CN109696604A - A kind of concentric cylinder SF6Breakdown voltage experimental provision - Google Patents
A kind of concentric cylinder SF6Breakdown voltage experimental provision Download PDFInfo
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- CN109696604A CN109696604A CN201710993679.2A CN201710993679A CN109696604A CN 109696604 A CN109696604 A CN 109696604A CN 201710993679 A CN201710993679 A CN 201710993679A CN 109696604 A CN109696604 A CN 109696604A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/16—Construction of testing vessels; Electrodes therefor
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The present invention relates to a kind of concentric cylinder SF6Breakdown voltage experimental provision, including closed shell are installed with inner and outer electrodes in closed housing body, and interior electrode is conductive electrode stick, and the extremely cylindrical conductive tube of dispatch from foreign news agency, interior electrode passes through external electrode, and is arranged along the axis of external electrode, external electrode ground connection；The SF of gas with various pressure is filled in closed housing body6, under each gas pressure, apply experimental voltage on interior electrode, and be gradually increased experimental voltage until breakdown, records corresponding breakdown voltage under each gas pressure, and then obtain SF6The corresponding relationship of air pressure and breakdown voltage.Therefore, experimental provision detection accuracy is high, can relatively accurately get SF6The corresponding relationship of air pressure and breakdown voltage.The device can be the DC electric field intermediate gap breakdown voltage and SF in slightly uneven electric field6Air pressure relationship research provides significant data, to obtain corresponding calculation method and criterion.
Description
Technical field
The present invention relates to a kind of concentric cylinder SF6Breakdown voltage experimental provision belongs to D.C. isolation technical field.
Background technique
(gas-insulated metal enclosed switch gear, gas-insulated metal enclosed switchgear are set GIS
It is standby) it is one of key equipment in power grid construction, metal casing filled full equipment of the insulating gas as arc-extinguishing medium.It is general right
Ground insulation and phase insulation are by the SF with good arc extinction performance and insulation characterisitic of certain pressure6Gas undertakes, SF6It is
Ideal dielectric and arc-extinguishing medium.
The C.M.Cooke professor of Massachusetts Institute Technology and Japan S.Menju, K.Takahashi were in 70 years 20th century
In generation, is to coaxial cylindrical electrode in different SF6Dc breakdown characteristic under gas pressure is studied, studies have shown that in electric field ladder
(it is lower than 0.1-0.15MPa) when degree is no more than 150-200kV/cm or in the lesser situation of atmospheric pressure, dc breakdown voltage
Polar effect is not apparent and and SF6Gas pressure is in a linear relationship, can preferably predict SF using theoretical formula6Together
The disruptive field intensity of axial cylindrical gas gap, in electrode overlay film, the electrode winding cruel film of polyethylene terephthalate (PET) and will be outer
When shell electrode inner surface coats stickum, the D.C. isolation intensity of gas gap can be effectively improved.However larger
Breakdown voltage dispersibility is very big under gas pressure and large scale electrode size, and original theoretical model model can only derive maximum
Breakdown voltage does not establish minimum disruptive voltage effective theory deduction formula.
For the insulation calculation method and criterion of high voltage direct current product, there is new feature relative to exchange product, such as
Polar effect etc..The country rarely has enterprise to carry out the D.C. isolation criterion for being suitble to itself products characteristics.China Electric Power Research Institute
Long gap concentric cylinder SF is established by test6Gap dc breakdown voltage computation model is SF6Gas gap insulation optimization
Foundation is provided.Xi'an Communications University thinks Insulation of Large Transformer situation application insulation resistance, absorptance and polarization index 3 surveys
The different situations of magnitude carry out comprehensive descision, and a certain analytical measurement result is unqualified not to determine qualified judgement of entirely insulating.Extensively
Eastern grid company is single-phase by 10kV XLPE cable and three-phase ground out-of-balance current establishes insulation simulation model, uses Matlab
Software carries out simulation calculation to single-phase, three-phase entirety and minor insulation failure, obtains ground connection out-of-balance current and insulating layer electricity
Resistance, capacitor, the relationship between dielectric dissipation factor, obtain the criterion of cross-linked polyethylene insulated cable (XLPE) insulation breakdown.
Tsinghua University uses leader development model method as insulation flashover criterion, is used for Three Gorges 500kV double back then dry doubling frame outlet scheme
The research of lightning protection properties, and compared with other flashover criterions and its calculated result.The Central China University of Science and Technology measures part
The degree of polymerization for the insulating paper that area provides, measuring the result obtained can be inferred that the aging conditions of transformer, also can be used as chaff
The reference of aldehyde measurement result.In terms of GIS insulation characterisitic, at this stage for insulator surface flashover characteristics with its surface roughness and
In terms of the research of material category changing rule has focused largely on miniaturization, cylindrical dielectric material, GIS in Practical Project is answered
Research in terms of the insulated with material characteristic such as insulator, shielding part is very rare, and shortage system is in depth studied.
Therefore, SF6The corresponding relationship of air pressure and breakdown voltage is for direct currents products such as GIS, GIL, direct-current wall bushings
R & D design has vital effect, only get accurate corresponding relationship can R & D design go out safety can
The direct current product leaned on.
Summary of the invention
The object of the present invention is to provide a kind of concentric cylinder SF6Breakdown voltage experimental provision, for obtaining SF by experiment6
The corresponding relationship of air pressure and breakdown voltage.
To achieve the above object, the solution of the present invention includes a kind of concentric cylinder SF6Breakdown voltage experimental provision, including it is close
Closed shell body, is installed with inner and outer electrodes in the closed housing body, interior electrode is conductive electrode stick, and dispatch from foreign news agency is extremely cylindrical
Conductive tube, the interior electrode passes through the external electrode, and is arranged along the axis of the external electrode, the external electrode ground connection；It is closed
The SF of gas with various pressure is filled in shell6, under each gas pressure, inside electrode applies experimental voltage, and is gradually increased reality
Electrical verification straightening records corresponding breakdown voltage under each gas pressure to puncturing, and then obtains SF6Air pressure is corresponding with breakdown voltage
Relationship.
Concentric cylinder SF provided by the invention6In breakdown voltage experimental provision, interior electrode and outer is installed in closed housing body
Electrode, inner and outer electrodes are placed in SF6In gaseous environment, interior electrode is conductive electrode stick, the extremely cylindrical conduction of dispatch from foreign news agency
Cylinder, interior electrode pass through external electrode, and along the axis of external electrode be arranged, that is to say, that interior electrode external electrode midline position, outside
The axial direction of the inner wall of electrode just with interior electrode keeping parallelism, is uniformly distributed electric field between internal and external electrode as far as possible, external electrode
Ground connection setting.When being detected, the SF of gas with various pressure is filled in closed housing body6, for some gas pressure, to interior
Electrode applies experimental voltage, and is gradually increased the experimental voltage of application, until breakdown, records corresponding breakdown under the gas pressure
Voltage also tests other gas pressures as procedure described above, finally obtains breakdown corresponding to other each gas pressures
Voltage can obtain SF by analyzing data6The corresponding relationship of air pressure and breakdown voltage.Therefore, experimental provision benefit
Breakdown test is carried out with the relationship between interior electrode, external electrode and two electrodes, measures the breakdown potential under each gas pressure
Pressure, detection accuracy is high, can relatively accurately get SF6The corresponding relationship of air pressure and breakdown voltage.So, which can
Think DC electric field intermediate gap breakdown voltage and the SF in slightly uneven electric field6Air pressure relationship research provides significant data, thus
Obtain corresponding calculation method and criterion, therefore, the experimental provision is straight for direct current GIL, direct-current wall bushing, direct current GIS etc.
Flowing researching and developing for switch product has important directive significance, and the lower insulation criterion of DC electric field effect is determined to greatly speed up directly
The research and development progress of stream switch new product, improves reliability of the product by type experiment, reduces the R&D cycle of new product, reduce
Research and develop cost.
The periphery of the external electrode is provided with shielding cylinder, to guarantee the ambient enviroment electric fields uniform of external electrode.
One end of the interior electrode connects an electric connector, and the electric connector is used to connect external dc voltage equipment,
The other end of the interior electrode is fixed on a seal, and the seal is fixedly mounted on the bottom plate of closed shell.
Installation pedestal, the external electrode and the shielding cylinder and the installation base are provided on the inner wall of the closed shell
Seat is fixedly connected.
The experimental provision further includes a casing bit, described sleeve pipe device and the closed shell airtight connection, institute
Stating in casing bit has a conducting rod, and one end of the conducting rod is for connecting external dc voltage equipment, the conducting rod
The other end connect the electric connector, pass through the conductive connection that electric connector realizes conducting rod and the interior electrode.
The interior electrode is conductive aluminium bar, the dispatch from foreign news agency extremely aluminum barrel.
The both ends fillet bending of the aluminum barrel cylinder.
The seal includes that mounting plate, barricade and insulating cylinder pour dress, and the other end of the interior electrode is mounted on institute
It states on mounting plate, the mounting plate is fixed on the barricade, and the barricade, which is fixed on the insulating cylinder and pours, to be loaded onto, described
Insulating cylinder pours dress and is fixed on the bottom plate of the closed shell.
Detailed description of the invention
Fig. 1 is concentric cylinder SF6The overall structure diagram of breakdown voltage experimental provision；
Fig. 2 is the structural schematic diagram of interior electrode；
Fig. 3 is the structural schematic diagram of external electrode；
Fig. 4 is the structural schematic diagram of shielding cylinder；
Fig. 5 is concentric cylinder SF6A kind of specific embodiment structural schematic diagram of breakdown voltage experimental provision；
Fig. 6 is the connection relationship diagram between experimental provision and DC experiment system.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
The present embodiment provides a kind of concentric cylinder SF6Breakdown voltage experimental provision, as shown in Figure 1, including closed shell
101, it is installed with the interior electrode 102 and external electrode 103 for experiment in closed shell 101, can be filled with not in closed shell 101
With the SF of gas pressure6Gas makes experimental situation locating for interior electrode 102 and external electrode 103 full of SF6Gas, also, guarantee
SF6Gas will not be from shell to outward leakage.As shown in Fig. 2, interior electrode 102 be conductive electrode stick, such as conductive metal stick or
Person's electrically conductive graphite stick, in the present embodiment, interior electrode 102 is conductive aluminium bar, also, in order to guarantee electric discharge uniformly, conductive aluminium bar
Smooth outer surface.External electrode 103 is cylindrical conductive tube, and similarly with interior electrode 102, the present embodiment is by taking aluminum barrel as an example, equally
The both ends fillet bending of ground, aluminum barrel inner wall smooth, also, aluminum barrel, fillet bending are the rounding ofves in order to reduce wedge angle, simultaneously
It can make aluminum barrel both ends electric fields uniform to a certain extent.As shown in figure 3, since aluminum barrel needs to be fixed in closed shell 101,
So the lower end of aluminum barrel will also be longer than upper end, the inner wall of closed shell 101 is extended to, by the way that lower end is fixed on closed shell
The fixation (having a detailed description subsequent) of aluminum barrel is realized on 101 wall.
Since external electrode 103 is cylindrical tube on the whole, there are a middle lines for external electrode 103, that is, in
Mandrel line, as shown in Figure 1, interior electrode 102 pass through external electrode 103, and along the axis of external electrode 103 be arranged, external electrode 103 it is interior
Wall just with interior 102 keeping parallelism of electrode, is uniformly distributed electric field between internal and external electrode as far as possible.External electrode 103 is grounded, and guarantees potential
It is 0.
The present embodiment provides a kind of embodiment of the numberical range of the diameter of interior electrode and the inner diameter of external electrode, tool
Body are as follows: inner electrode diameter range is 20mm~40mm, and the inner diameter range of external electrode is that (the two ranges are by 60mm~80mm
Pass through simulating, verifying).
Further, as shown in Figure 1, ambient enviroment electric fields uniform in order to make external electrode 103, in the outer of external electrode 103
Enclose and be provided with a shielding cylinder 104, as shown in figure 4, using shielding cylinder 104 by internal and external electrode be overlapped position carry out electric field protection with
Guarantee that 103 surrounding electric field of external electrode is uniform, certainly, which is metal cylinder.The diameter of shielding cylinder inner wall and external electrode it is straight
There is no physical relationship between diameter, as long as shielding cylinder can cover external electrode in length.
When being detected, the SF of gas with various pressure is filled in closed shell 1016, under some gas pressure, give
Interior electrode 102 applies experimental voltage, and further, the voltage of application is reverse voltage, and is gradually increased the experiment electricity of application
Pressure, until breakdown (gap i.e. between breakdown internal and external electrode), records corresponding breakdown voltage under the gas pressure.Above-mentioned is one
The acquisition process of the corresponding breakdown voltage of a gas pressure the step of according to the acquisition process, changes gas pressure, each to other
Gas pressure is tested, and can obtain breakdown voltage corresponding to other each gas pressures, and then obtain SF6Air pressure and breakdown
The corresponding relationship of voltage.Further, electric field breakdown criterion method be can analyze out according to corresponding relationship.
It should be noted that typical slightly uneven electric field this for concentric cylinder, negative polarity breakdown voltage is obviously low
In positive polarity breakdown voltage, in direct current electric transmission and transformation system, direct current SF6There are positive polarity or the fortune of negative polarity for air insulating device
Row state, and the general operating pressure of equipment is 0.4~0.5MPa, this negative polarity d. c breakdown voltage is only positive polarity breakdown voltage
0.7~0.8 times, the about half of theoretical breakdown voltage value, therefore when carrying out insulating Design and insulation performance research is mainly examined
Consider and applies negative polarity d. c voltage.Certainly, the case where being also not excluded for using positive polarity DC voltage.
Based on the above-mentioned technical proposal, one of them specific application example is given below.
As shown in figure 5, experimental provision includes casing bit 1 arranged up and down and closed shell, the insulation sleeve of casing bit 1
Pipe and the cylinder of closed shell be welded by cylinder be welded on lower flange 2 and bolt be fixedly connected, flange contact facings be arranged
There are seal groove and sealing ring, guarantees the air-tightness of package unit.Casing bit 1 is the introducing device of DC high-voltage power supply, in
There is a conducting rod in portion, and one end of the conducting rod connects electric connector 3, electricity for connecting external dc high voltage power supply, the other end
Groove is arranged in 3 inner surface of connector, and installation spring touch finger in inside realizes that the close contact between conducting rod and electric connector 3 connects
It connects.The conducting rod plays the role of transfer overvoltage and electric current, and the insulating sleeve of casing bit 1 realizes the insulation to surrounding medium.
The upper end of interior electrode 4 connects electric connector 3, realizes the conductive connection of conducting rod and interior electrode 4, and specific connection relationship can be with are as follows:
Bolt is provided on electric connector 3, interior electrode 4 is in close contact by the bolt and electric connector 3 and is connected.Cylinder is welded 5 and cylinder
Body is welded between 12 plus counter flange 8, and is bolted to connection, and guarantees the air-tightness of whole device, counter flange 8 in addition to
Transition cylinder be welded 5 with cylinder be welded 12 effect except, be also used as the installation pedestal of external electrode 7 and shielding cylinder 6, dispatch from foreign news agency
Pole 7 and shielding cylinder 6, which are bolted, to be installed on counter flange 8, and carries out ground connection by counter flange 8 and guarantee that potential is 0.
The lower end of interior electrode 4 is bolted to connection a seal, the seal include connecting plate (also referred to as
Mounting plate) 9, barricade 10 and insulating cylinder pour and fill 11, the lower end of interior electrode 4 is mounted by means of bolts on connecting plate 9, connection
Plate 9 is bolted to connection the upper surface of barricade 10, and barricade 10, which is bolted to connection insulating cylinder and pours, to be filled on 11,
Insulating cylinder, which pours, to be filled 11 and is fixedly attached on bottom plate 14 by bolt 13.Cylinder, which is welded between 12 and bottom plate 14, is welded 12 by cylinder
On flange and bolt be fixedly connected, flange contact facings is provided with seal groove and sealing ring, guarantees the air-tightness of package unit.Bottom
Plate 14 is bolted to connection with bracket 15, and 15 outermost width of bracket is greater than cylinder and is welded 12 assembly width.
In addition, casing bit 1, electric connector 3 and insulating cylinder pour and fill 11 and can be Cubicle Gas-Insulated Switchgear
Used in components, such as: casing bit 1 is conventional column support type gas-insulated electronic current-voltage combination transformer.
In Fig. 5,16 be the hex bolts of M20 × 120,17 be the hex bolts of M12 × 45,18 be the hex bolts of M8 × 20,19
It is the hexagon-headed bolt of M12 × 45 for the hexagon-headed bolt of M16 × 120,20,21 be the hexagon-headed bolt of M12 × 45, and 22 be M14 × 45
Hexagon-headed bolt, 23 be the hexagon-headed bolt of M14 × 45, and 24 be the hex bolts of M16 × 120, and 25 be the hex bolts of M18 × 100.
In breakdown test, experimental loop includes DC experiment system, protective resistance R1, experimental provision and corresponding phase connected set
Pipe etc..Wherein, DC experiment system includes DC voltage generator ontology, protective resistance, measurement divider, earthing switch and survey
Amount control system etc., for generating and exporting adjustable high direct voltage.
Before experiment starts, experimental loop is first installed, it is desirable that clean in experimental provision, dry, without particulate debris, sealing
Property good, electrode centers overlapping of axles, experimental provision is disposed vertically.Then, DC experiment system, protective resistance R1 and experiment are connected
Device constitutes experimental loop, as shown in Figure 6.
SF is filled with into experimental provision6Gas, by low pressure, and be stepped up, and in the overall process of rising
Several data samples are chosen, for example are chosen in certain air pressure range with centainly measuring step-length.For some data
Sample value, DC experiment system gives interior one negative polarity d. c voltage of electrode, and the pressure regulator for adjusting DC voltage generator comes gradually
The numerical value for increasing negative polarity d. c voltage, can boost according to any one in following two ways: first when 1. boosting
75U% is first boosted to certain speed (can be very fast), then with the speed boosting of 2U% until breakdown (GBT 16927.1-2011
High-voltage test techniques part 1: general definition and test requirements document 5.3.1)；2. breakdown is boosted to 5kV/s speed, such as
SF6To be boosted under 0.4MPa air pressure with 5kV/s speed.Record experimental provision temperature is gentle before each boosting simultaneously
Numerical value is pressed, atmospheric pressure value is re-read after voltage breakdown, avoids device gas leakage in experimentation.Moreover, fast after gap breakdown
Prompt drop pressure, and breakdown voltage numerical value is recorded, acquire breakdown current waveform.Using earth brace by it is on device, especially in electrode 4
On residual charge bleed off, repeat above-mentioned breakdown step, be repeated 5 times altogether, if data dispersibility is larger, increase experiment number,
But each experiment number is not to be exceeded 10 times, otherwise needs to power off the entire circuit of inspection and device parameter re-starts step up side
Amount.
Above-mentioned is that the breakdown voltage detection process under a barometric information sample value then presses other barometric information sample values
It is detected according to same experimentation, the corresponding breakdown voltage numerical value of each barometric information sample value is thus obtained, to these data
It is handled, the fitting formula of available breakdown voltage Em and air pressure P:
Em=aP+b
Wherein, a, b are the coefficient relevant to internal and external electrode gap obtained according to corresponding relationship.
Therefore, SF can be obtained by above-mentioned experimentation6The breakdown voltage and SF of gas gap6Air pressure, or referred to as field
Strong corresponding relationship.
It is confirmed in other relevant product experiments using experimental provision provided by the invention.Certain high-voltage product is same
Axial cylindrical structure, inner electrode diameter 30mm obtain it in 0.4MPa SF by analysis6Dc breakdown voltage is under air pressure
276kV, actual breakdown voltage 271kV, prediction deviation 2.95%.Certain high-voltage product is concentric cylinder structure, and interior electrode is straight
Diameter is 60mm, obtains it in 0.4MPa SF by analysis6Dc breakdown voltage is 552kV under air pressure, and actual breakdown voltage is
559kV, prediction deviation 1.43%.As it can be seen that the breakdown voltage and practical breakdown that are obtained using experimental provision provided by the invention
Voltage deviation is 5% hereinafter, dc breakdown voltage prediction is more accurate.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.Base of the invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in introduction according to the present invention
The model of shape, formula, parameter do not need to spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment carries out are still fallen in protection scope of the present invention.
Claims (8)
1. a kind of concentric cylinder SF6Breakdown voltage experimental provision, which is characterized in that solid in the closed housing body including closed shell
Equipped with inner and outer electrodes, interior electrode is conductive electrode stick, and the extremely cylindrical conductive tube of dispatch from foreign news agency, the interior electrode is across institute
External electrode is stated, and is arranged along the axis of the external electrode, the external electrode ground connection；Gas with various pressure is filled in closed housing body
SF6, under each gas pressure, inside electrode applies experimental voltage, and is gradually increased experimental voltage until breakdown, records each gas
Corresponding breakdown voltage under pressure, and then obtain SF6The corresponding relationship of air pressure and breakdown voltage.
2. concentric cylinder SF according to claim 16Breakdown voltage experimental provision, which is characterized in that outside the external electrode
It encloses and is provided with shielding cylinder, to guarantee the ambient enviroment electric fields uniform of external electrode.
3. concentric cylinder SF according to claim 16Breakdown voltage experimental provision, which is characterized in that the one of the interior electrode
One electric connector of end connection, the electric connector for connecting external dc voltage equipment, fix by the other end of the interior electrode
On a seal, the seal is fixedly mounted on the bottom plate of closed shell.
4. concentric cylinder SF according to claim 26Breakdown voltage experimental provision, which is characterized in that the closed shell
Installation pedestal is provided on inner wall, the external electrode and the shielding cylinder are fixedly connected with the installation pedestal.
5. concentric cylinder SF according to claim 36Breakdown voltage experimental provision, which is characterized in that the experimental provision is also
Including a casing bit, described sleeve pipe device and the closed shell airtight connection have a conduction in described sleeve pipe device
Bar, one end of the conducting rod connect the electrical connection for connecting external dc voltage equipment, the other end of the conducting rod
Device realizes the conductive connection of conducting rod and the interior electrode by electric connector.
6. concentric cylinder SF according to claim 16Breakdown voltage experimental provision, which is characterized in that the interior electrode is to lead
Electrit stick, the dispatch from foreign news agency extremely aluminum barrel.
7. concentric cylinder SF according to claim 66Breakdown voltage experimental provision, which is characterized in that the aluminum barrel cylinder
Both ends fillet bending.
8. concentric cylinder SF according to claim 36Breakdown voltage experimental provision, which is characterized in that the seal packet
It includes mounting plate, barricade and insulating cylinder and pours dress, the other end of the interior electrode is mounted on the mounting plate, and the mounting plate is solid
Be scheduled on the barricade, the barricade, which is fixed on the insulating cylinder and pours, to be loaded onto, the insulating cylinder pour dress be fixed on it is described close
On the bottom plate of closed shell body.
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| CN110308340A (en) * | 2019-05-08 | 2019-10-08 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of direct-current wall bushing failure simulation device and method |
| CN110688751A (en) * | 2019-09-24 | 2020-01-14 | 西南大学 | Simulation method for detecting SF6 by using platinum-doped modified graphite alkyne sensor |
| CN111830374A (en) * | 2020-06-22 | 2020-10-27 | 重庆大学 | Liquid discharge voltage polarity optimization method based on polarity effect change point |
| CN112507632A (en) * | 2020-11-25 | 2021-03-16 | 云南电网有限责任公司电力科学研究院 | Method for evaluating insulation strength and discharge probability of arc extinguish chamber of high-voltage gas circuit breaker |
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