CN104880653A - Needle-plate electrode corona discharge assembly for AC-DC high voltage test - Google Patents
Needle-plate electrode corona discharge assembly for AC-DC high voltage test Download PDFInfo
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- CN104880653A CN104880653A CN201510283318.XA CN201510283318A CN104880653A CN 104880653 A CN104880653 A CN 104880653A CN 201510283318 A CN201510283318 A CN 201510283318A CN 104880653 A CN104880653 A CN 104880653A
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Abstract
The invention discloses a needle-plate electrode corona discharge assembly for an AC-DC high voltage test; the needle-plate electrode corona discharge assembly comprises a needle array electrode, and an upper metal plate electrode and a lower metal plate electrode; the needle array is nested in the upper metal plate connected with a high voltage generator; the lower metal plate electrode is grounded; the upper and lower metal plate electrodes are respectively connected with an upper insulation plate and a lower insulation plate, and the distance between the upper and lower metal plate electrodes is adjustable; a sample is placed on the lower metal plate electrode and right opposite to the needle array; after the voltage is applied, uniform corona discharge is generated between the needle array electrode and the metal plate electrodes, and the distance between the upper and lower metal plate electrodes can be adjusted so as to respectively carry out charge characteristic test and rapid corona aged test for the sample. The beneficial effects are that the height between the upper and lower metal plate electrodes so as to respectively carry out the charge characteristic test and the rapid corona aged test; the length of the lower metal plate electrode equals to 5-8times of that of the needle array, so corona discharge test can be simultaneously carried out for many samples.
Description
Technical field
The present invention relates to alternating current-direct current High-Voltage Experimentation Technology field, particularly relate to a kind of Field of Corona between Needle and Board electric discharge device for alternating current-direct current high-potting.
Background technology
Polymer dielectric relies on the physical property of its excellence, mechanical property and thermal behavior, and be widely used in electric/electronic device, can the quality of its insulating property is directly connected to equipment safe and stable operation.In the composite insulation system be made up of solids-gases, when applying certain voltage on insulation system, electric discharge always first occurs on solid-air interface, i.e. creeping discharge.Along with voltage raises further, creeping discharge can develop into perfoliate puncturing, and is called edge flashing.When edge flashing occurs, the failure of insulation of system, usually causes accident to occur.All have both at home and abroad and cause electrical equipment to damage about polymer dielectric edge flashing or cause the report of large area blackout.Large quantity research shows, the existence of surface charge not only makes the applied electric field of insulating material distort, and more the evolution of edge flashing provides required electric charge, is cause solid surface dielectric strength to reduce, cause creeping discharge accident, cause the major reason that electrical equipment damages.
Therefore, the mechanism investigating surface charge accumulation and dissipation, to reasonable employment polymer dielectric, is deeply familiar with the essence of edge flashing, ensures that the safe operation of power equipment has important theory significance and practical value.And the research to dielectric charge characteristic, need the surface charge being injected quantitative and qualitative in laboratory by high-potting system to dielectric, in test, the performance of needle plate electrode device used will directly affect the distribution character of surface charge on insulating material surface, thus has an impact to test findings.
On the other hand, silicon rubber compound insulator uses the history having had nearly 40 years as transmission line of electricity external insulation, all use composite insulator in the electrical network of a lot of countries and regions.But silastic material is organic material, different with the inorganic material such as glass insulator from pottery, the large molecule of organic material easily ruptures, and especially under the environmental factor effects such as corona discharge, molecular link easily ruptures, and causes organic material aging.When composite insulator occurs aging, its surface hydrophobicity declines, and electric property and mechanical property all can decline thereupon.For simulating composite insulator aging performance under different running environment better, Chinese scholars has carried out large quantifier elimination to composite insulator artificial accelerated aging test method, but not yet forms very complete unified standard test method.In high-potting, accelerated aging test is carried out to composite insulator, pin-plate corona discharge electrode is indispensable device in test equally, and pin electrode distribution character is directly connected to the distribution situation of silastic surface ageing properties, to directly having an impact to test figure.
No matter be charge characteristic test or quick corona aging test, needle to board electrode is all the key factor in test.Both require that pin electrode used arranges evenly, but needle to board electrode spacing is had any different again in concrete test, therefore the distribution of two kinds of test electrode used thereins is slightly different again, different test mechanism electrode used thereins often differs larger, when carrying out charge characteristic test and quick corona aging test, often need individually to build pin array-plate electrode, and can not set of device be shared.
Summary of the invention
Object of the present invention is exactly to solve the problem, propose a kind of Field of Corona between Needle and Board electric discharge device for alternating current-direct current high-potting, this device uses easy to assembly, sound construction, security high, and can by highly regulating change needle to board electrode spacing to be applicable to dielectric charge injection test and quick corona aging test.
To achieve these goals, the present invention adopts following technical scheme:
For a Field of Corona between Needle and Board electric discharge device for alternating current-direct current high-potting, comprising: needle-array electrode and upper and lower plate electrodes; Described pin array is embedded in sheet metal, and upper sheet metal is connected with high-voltage generator, lower plate electrodes ground connection; Described upper and lower plate electrodes connects upper and lower insulcrete respectively, and the distance between described upper and lower plate electrodes is adjustable;
Sample is placed on lower plate electrodes also just to pin array; After applying voltage, uniform corona discharge is produced between needle-array electrode and plate electrodes, by regulating the distance between upper and lower plate electrodes, not needing to change faller gill array structure, charge characteristic test and quick corona aging test can be carried out to sample respectively.
Described needle-array electrode distribution is specially: often all form equilateral triangle between adjacent three pins.
The tip diameter of described needle-array electrode is between 0.2 ~ 0.5mm.
Same pin array pin electrode material used and tip diameter unification.
Described upper plate electrodes setting position is provided with high-tension electricity pole, is connected with high-voltage generator by high-tension electricity pole.
Described upper plate electrodes is placed in an insulcrete cover, and on described insulcrete cover, corresponding position is provided with the preformed hole for being stretched out by high-tension electricity pole.
Described upper plate electrodes is connected with upper insulation support plate, according to needle-array electrode arrangement, and corresponding position perforating on insulation support plate on described.
Described lower plate electrodes is connected with lower insulation support plate, and described lower insulation support plate length is 5 ~ 8 times of needle-array electrode length.
The length of described lower plate electrodes is 5 ~ 8 times of needle-array electrode length, tests for realizing to multiple sample simultaneously.
Be connected by insulation blanket stud between described upper and lower insulation support plate, and regulate the distance between upper and lower insulation support plate by setting nut, and then regulate the distance between upper and lower plate electrodes.
The invention has the beneficial effects as follows:
The present invention uses sound construction, wiring simple, easy to assembly; Upper sheet metal high-field electrode part is all placed in insulating boot, safely, reliably.
Needle-array electrode arrangement of the present invention is specially, and the spacing of every three pins is equilateral triangle, and pin electrode tip diameter is between 0.2 ~ 0.5mm, is conducive to forming field strength distribution at dielectric surface even.
Height adjustable between the upper and lower plate electrodes of the present invention, can be used for carrying out charge characteristic experiment and Accelarated aging test respectively; Lower plate electrodes length is 5 ~ 8 times of pin array, can carry out corona test to multiple sample simultaneously.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention structural representation;
Fig. 2 is needle-array electrode of the present invention arrangement schematic diagram.
Wherein, 1 time insulation support plate, 2 times sheet metals, 3 insulating nuts, insulation support plate on 4,5 insulation blanket studs, 6 pin electrodes, sheet metal on 7,8 insulating boots, 9 high-tension electricity poles.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:
For a Field of Corona between Needle and Board electric discharge device for alternating current-direct current high-potting, as shown in Figure 1, comprise pin array and upper and lower sheet metal 2 electrode, pin array is connected to sheet metal 7, and upper sheet metal 7 is connected with high-voltage generator, lower sheet metal 2 electrode ground connection; Sample is placed on lower sheet metal 2 electrode also just to pinpoint array; After applying voltage, producing uniform corona discharge between needle-array electrode and plate electrodes can to specimen surface iunjected charge, and acceleration sample is aging.
Needle-array electrode distribution is as follows: the spacing of every three pins is equilateral triangle, and pin electrode 6 tip diameter is between 0.2 ~ 0.5mm, with an array pin electrode 6 used material and tip diameter unification.Pin array is embedded in sheet metal 7.
Upper sheet metal 7 is equipped with a high-tension electricity pole 9 at fixed bit, facilitates test connection, and upper sheet metal 7 and high-tension electricity pole 9 material therefor are copper.Upper sheet metal 7 is placed in insulation support plate 4 on, and upper insulation support plate 4 material therefor is teflon or epoxy resin, and according to the perforating of pin array arrangement in upper insulation support plate 4.
Upper sheet metal 7 covers in an insulating boot 8, and described insulating boot 8 material therefor is teflon or epoxy resin, and leaves a hole in fixed position, so that high-tension electricity pole 9 stretches out.By this layout, whole electrification in high voltage device being covered in a seal, only staying a high-tension electricity pole 9 for connecing high-voltage test electric power, improve equipment safety coefficient.
Lower sheet metal 2 is placed in lower insulation support plate 1, and is equipped with a preformed hole at fixed bit, so that connect ground wire; Material therefor is aluminium sheet or copper coin.Lower insulation support plate 1 material therefor is epoxy resin, and length is 5 ~ 8 times of described pin array, and lower sheet metal 2 length is identical with lower insulation support plate 1 length, so that can carry out corona test to multiple sample simultaneously.
Upper and lower insulation support plate 1 is connected by insulation blanket stud 5, and the spacing of two back up pads of readjusting prices by nut and screw rod, thus the distance between pin electrode 6 and plate electrode can be changed.
Specific experiment process is as follows:
Embodiment 1
(1) corona unit high-tension electricity pole 9 is connect high-voltage ac power, the silicon rubber being of a size of 80mm × 40mm is placed on lower insulation support plate 1, regulated by insulating nut 3 and make pin electrode 6 to sample apart from being 50mm; And by lower sheet metal 2 ground connection.
(2) by regulate high-voltage ac power adjustment output voltage be 10kV, pressing time 6h;
(3) after having pressurizeed, sample is taken out, and measure its surperficial diverse location place static contact angle.
(4) contrast of specimen surface diverse location static contact angle is found: specimen surface static contact angle is evenly distributed, and shows that specimen surface degree of aging is evenly distributed.
Embodiment 2
(1) corona unit high-tension electricity pole 9 is connect high-voltage DC power supply, the epoxy specimens being of a size of 80mm × 40mm is placed on lower insulation support plate 1, regulated by insulating nut 3 and make pin electrode 6 to sample apart from being 30mm; And by lower sheet metal 2 ground connection.
(2) by regulating high-voltage DC power supply adjustment output voltage to be+3kV, 15 minutes pressing times;
(3) after having pressurizeed, sample is taken out, and measure its surperficial diverse location place current potential with electrometer.
(4) distribution of duplicate surface potential finds that specimen surface Potential distribution is even, shows that pin array arrangement is even, is evenly distributed to specimen surface iunjected charge amount.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. for a Field of Corona between Needle and Board electric discharge device for alternating current-direct current high-potting, it is characterized in that, comprising: needle-array electrode and upper and lower plate electrodes; Described pin array is embedded in sheet metal, and upper sheet metal is connected with high-voltage generator, lower plate electrodes ground connection; Described upper and lower plate electrodes connects upper and lower insulcrete respectively, and the distance between described upper and lower plate electrodes is adjustable; By regulating the distance between upper and lower plate electrodes, charge characteristic test and quick corona aging test can be carried out to sample respectively.
2. a kind of Field of Corona between Needle and Board electric discharge device for alternating current-direct current high-potting as claimed in claim 1, is characterized in that, described needle-array electrode distribution is specially: often all form equilateral triangle between adjacent three pins.
3. a kind of Field of Corona between Needle and Board electric discharge device for alternating current-direct current high-potting as claimed in claim 1, it is characterized in that, the tip diameter of described needle-array electrode is between 0.2 ~ 0.5mm.
4. a kind of Field of Corona between Needle and Board electric discharge device for alternating current-direct current high-potting as claimed in claim 1, is characterized in that, same pin array pin electrode material used and tip diameter unified.
5. a kind of Field of Corona between Needle and Board electric discharge device for alternating current-direct current high-potting as claimed in claim 1, it is characterized in that, described upper plate electrodes setting position is provided with high-tension electricity pole, is connected with high-voltage generator by high-tension electricity pole.
6. a kind of Field of Corona between Needle and Board electric discharge device for alternating current-direct current high-potting as claimed in claim 1, it is characterized in that, described upper plate electrodes is placed in an insulcrete cover, and on described insulcrete cover, corresponding position is provided with the preformed hole for being stretched out by high-tension electricity pole.
7. a kind of Field of Corona between Needle and Board electric discharge device for alternating current-direct current high-potting as claimed in claim 1, it is characterized in that, described upper plate electrodes is connected with upper insulation support plate, according to needle-array electrode arrangement, and corresponding position perforating on insulation support plate on described.
8. a kind of Field of Corona between Needle and Board electric discharge device for alternating current-direct current high-potting as claimed in claim 1, it is characterized in that, described lower plate electrodes is connected with lower insulation support plate, and described lower insulation support plate length is 5 ~ 8 times of needle-array electrode length.
9. a kind of Field of Corona between Needle and Board electric discharge device for alternating current-direct current high-potting as claimed in claim 8, it is characterized in that, the length of described lower plate electrodes is 5 ~ 8 times of needle-array electrode length, tests for realizing to multiple sample simultaneously.
10. a kind of Field of Corona between Needle and Board electric discharge device for alternating current-direct current high-potting as claimed in claim 1, it is characterized in that, be connected by insulation blanket stud between described upper and lower insulation support plate, and regulate the distance between upper and lower insulation support plate by setting nut, and then regulate the distance between upper and lower plate electrodes.
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Cited By (9)
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| CN105548626A (en) * | 2015-12-23 | 2016-05-04 | 国网重庆市电力公司电力科学研究院 | Pulse electric field generation apparatus |
| CN109188113A (en) * | 2018-10-18 | 2019-01-11 | 华北电力大学 | The device and method of simulated environment test is carried out for simulating uniform ion flow field |
| CN109387755A (en) * | 2018-12-12 | 2019-02-26 | 国网山东省电力公司电力科学研究院 | A kind of high voltage direct current corona discharge characteristic experimental apparatus system |
| CN109541421A (en) * | 2017-09-22 | 2019-03-29 | 平高集团有限公司 | A kind of insulation sample corona ageing test apparatus |
| CN110739389A (en) * | 2019-11-27 | 2020-01-31 | 湖南声仪测控科技有限责任公司 | high-voltage uniform electric field polarization device |
| CN113394662A (en) * | 2021-06-23 | 2021-09-14 | 长安大学 | Coupled multi-rod-flat-plate electrode corona stabilizing switch and working method thereof |
| CN113655347A (en) * | 2021-07-16 | 2021-11-16 | 深圳供电局有限公司 | Corona aging apparatus and method |
| CN113702784A (en) * | 2021-08-30 | 2021-11-26 | 河北科技大学 | Electrostatic electromagnetic pulse induced needle-plate discharge experimental device |
| CN116430151A (en) * | 2023-04-25 | 2023-07-14 | 哈尔滨理工大学 | Electrode system for multiple-sample electrical aging test and preparation method thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109541421B (en) * | 2017-09-22 | 2021-10-29 | 平高集团有限公司 | Corona aging test device for insulation sample |
| CN109541421A (en) * | 2017-09-22 | 2019-03-29 | 平高集团有限公司 | A kind of insulation sample corona ageing test apparatus |
| CN109188113A (en) * | 2018-10-18 | 2019-01-11 | 华北电力大学 | The device and method of simulated environment test is carried out for simulating uniform ion flow field |
| CN109387755A (en) * | 2018-12-12 | 2019-02-26 | 国网山东省电力公司电力科学研究院 | A kind of high voltage direct current corona discharge characteristic experimental apparatus system |
| CN110739389A (en) * | 2019-11-27 | 2020-01-31 | 湖南声仪测控科技有限责任公司 | high-voltage uniform electric field polarization device |
| CN113394662A (en) * | 2021-06-23 | 2021-09-14 | 长安大学 | Coupled multi-rod-flat-plate electrode corona stabilizing switch and working method thereof |
| CN113655347A (en) * | 2021-07-16 | 2021-11-16 | 深圳供电局有限公司 | Corona aging apparatus and method |
| CN113655347B (en) * | 2021-07-16 | 2023-03-14 | 深圳供电局有限公司 | Corona aging apparatus and method |
| CN113702784A (en) * | 2021-08-30 | 2021-11-26 | 河北科技大学 | Electrostatic electromagnetic pulse induced needle-plate discharge experimental device |
| CN116430151A (en) * | 2023-04-25 | 2023-07-14 | 哈尔滨理工大学 | Electrode system for multiple-sample electrical aging test and preparation method thereof |
| CN116430151B (en) * | 2023-04-25 | 2023-10-20 | 哈尔滨理工大学 | Preparation method of electrode system for electrical aging test of multiple samples |
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