CN103105542A - High voltage electrode device for pulsed electro-acoustic space charge measuring system - Google Patents
High voltage electrode device for pulsed electro-acoustic space charge measuring system Download PDFInfo
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Abstract
The invention relates to a high voltage electrode device for a pulsed electro-acoustic space charge measuring system, and belongs to the technical field of pulsed electro-acoustic space charge measuring. According to the high voltage electrode device, an insulating support column and an upper metal high voltage electrode mast are fixed oppositely up and down, and are sealed inside a metal shielding shell through an insulating resin sealing piece. A lower metal high voltage electrode mast is arranged on the lower portion of the upper metal high voltage electrode mast. The upper end of a connecting ring of an insulating body is inserted inside a cavity of the upper metal high voltage electrode mast, and the lower end of the connecting ring of the insulating body penetrates an insulating pad ring and then is inserted inside a cavity of the lower metal high voltage electrode mast. An earthing electrode plate is arranged below the metal shielding shell, and a to-be-tested sample is arranged inside the metal shielding shell. The high voltage electrode device can adjust the resistance value of resistors inside the connecting ring of the insulating body according to the thickness of the to-be-tested sample, achieves wave impedance matching, improves the measuring accuracy of the pulsed electro-acoustic space charge measuring system, can be suitable for measuring of testing samples with different thicknesses, and is used for studying the influence of metal surface electron emission on generation and accumulation of space charges.
Description
Technical field
The present invention relates to a kind of high-field electrode device for the pulse electroacoustic method space charge measuring system, belong to for pulse electroacoustic method space charge measurement technical field.
Background technology
The space charge measurement technology is present domestic and international application the most a kind of solid dielectric space charge measurement technology, is mainly used in studying the gathering of space charge in solid dielectric, distributes, migration and attenuation process.Due to reasons such as mechanical wear, disruptive discharges, but electrode surface can become uneven to the high-field electrode in this measuring technique gradually, causes electric field distortion in long-term use, and local field strength increases.On the one hand, the Electric Field Distribution that is added on sample is no longer even, does not satisfy the requirement of Pulse Electric sound method measuring method, affects the accuracy of space charge measurement result.On the other hand, the sample of same thickness punctures when adding low voltage, is unfavorable for the research of space charge characteristic under high field intensity, has reduced the overall performance of measuring system.Fig. 1 is the existing structure of high-field electrode device, comprises metal shielding 1, insulating supporting post 2, metal electric pole 3, insulating resin packaging part 4, sample 5, grounding electrode plate 6.Metal shielding 1 ground connection is played electric field shielding and safeguard protection effect, and insulating supporting post 2 upper ends are fixed on metal shielding 1 center, is fixed on insulating supporting post 2 lower ends as the metal electric pole 3 of high-field electrode.For improving the insulating property of high-field electrode, insulating resin packaging part 4 is filled in around metal electric pole 3, places tested sample 5 between metal electric pole 3 and grounding electrode plate 6.Due to the effect of insulating resin packaging part 4, various piece is cast for an integral body, and metal electric pole 3 can not be dismantled separately.
The generation of space charge, gather be research key content, the charge injection that the metal surface electron emission causes has very important impact to this process.For field emission, utilize the Fowler-Nordheim equation to calculate and find, clean electrode surface, electric field intensity is greater than 10
7Can observe obvious field emission phenomenon during V/cm, when there was impurity in the metal surface, required electric field intensity can reduce by 100 times.When utilizing pulse radio-acoustic method space charge measuring system to measure the sample internal charge, the field intensity of electrode surface often can reach 10
5V/cm to 10
6Obvious field emission phenomenon because electrode surface is not exclusively clean, at this moment probably occurs in V/cm.Different metal materials has different potential barriers, and the charge injection that is caused by field emission also has a great difference.In the typical structure of high-field electrode device, metal electric pole 3 can not be dismantled separately, and the material of electrode can't change.If change a new high-field electrode device, because systematic parameter is very difficult in full accord, the deviation that exists system self to cause reduces the comparability between measurement result.Make in addition a new high-field electrode device and need to drop into the larger time, financial cost, and need to carry out a large amount of debugging calibration operations.Therefore utilize existing structure, be difficult to comprehensively and systematically study generation, the accumulation process of space charge, the particularly impact of Different electrodes material on this process.
When utilizing the pulse electroacoustic method space charge measuring system to measure sample inner space electric charge, can add the pulse signal of a nanosecond on sample, due to wavelength and the circuit size comparable size of signal, need to consider the wave process of pulse signal.In order to obtain high as far as possible pulse signal amplitude and reduce the pulse signal interference that brings of catadioptric back and forth on sample, need to consider impedance matching.The sample of different-thickness, its equivalent impedance operator can be different, therefore when the sample thickness difference is larger, is necessary the circuit parameter of high-field electrode device is adjusted.But in typical structure, resistance, isolation capacitance all are fixed in insulating resin packaging part 4, and design parameter can't be adjusted.
Summary of the invention
The objective of the invention is to propose a kind of high-field electrode device for the pulse electroacoustic method space charge measuring system, change the structure of existing high-field electrode device, to change easily the metal electric pole of high-field electrode, the electrode surface out-of-flatness that solution causes because of reasons such as discharges, thereby the electric field distortion that brings, the problem that local field strength increases, system performance descends, accuracy and the practicality of raising high-field electrode device.
The high-field electrode device that is used for the pulse electroacoustic method space charge measuring system that the present invention proposes, comprise metal shielding, insulating supporting post, insulating resin packaging part and grounding electrode plate, also comprise metal high voltage electrode column, insulator abutment ring, lower metal high voltage electrode column and insulation gasket ring; Described insulating supporting post is relative fixing up and down with upper metal high voltage electrode column, and is encapsulated in metal shielding by the insulating resin packaging part; Described lower metal high voltage electrode column is placed in the bottom of metal high voltage electrode column, is provided with the insulation gasket ring between upper metal high voltage electrode column and lower metal high voltage electrode column; Insert in the cavity of upper metal high voltage electrode column the upper end of described insulator abutment ring, and insert in the cavity of lower metal high voltage electrode column after passing the insulation gasket ring lower end of insulator abutment ring; Described grounding electrode plate is placed in the below of metal shielding, and tested sample is placed between grounding electrode plate and lower metal high voltage electrode column.
The high-field electrode device that is used for the pulse electroacoustic method space charge measuring system that the present invention proposes, its advantage is:
High-field electrode device of the present invention improves the structure of existing high-field electrode device, change the former metal electric pole that fixes into fixing upper metal high voltage electrode column and the lower metal high voltage electrode column that can change, the insulator gasket ring is placed between metal high voltage electrode column and lower metal high voltage electrode column, utilize the insulator abutment ring that the three is connected as a whole, can place the resistance of different resistances in the insulator abutment ring, the wave impedance coupling when realizing the different-thickness sample measurement.High-field electrode device of the present invention, can change easily the metal electric pole, solved due to metal electric pole surface in the high-field electrode device the become electric field distortion that out-of-flatness causes, the problem that local field strength increases, be conducive to comprehensively and systematically to understand generation and the accumulation process of dielectric inner space electric charge.In the use procedure of apparatus of the present invention, can be according to the thickness of tested sample, adjust the resistance in the insulator abutment ring, realize the wave impedance coupling, reduce the waveform that causes because of catadioptric back and forth overlapping on the resultant impact of space charge measurement.Improved the measurement accuracy of pulse electroacoustic method space charge measuring system.High-field electrode device of the present invention can adapt to the measurement of different-thickness sample, is used for the impact that the Investigation of Metal Surface electron emission produces, gathers space charge.
Description of drawings
Fig. 1 is existing high-field electrode section of structure.
Fig. 2 is the structural representation of the high-field electrode device that is used for the pulse electroacoustic method space charge measuring system that proposes of the present invention.
Fig. 3 is the sectional view of insulator abutment ring in high-field electrode device of the present invention.
In Fig. 1-Fig. 3 in, the 1st, metal shielding, the 2nd, insulating supporting post, the 3rd, metal electric pole, the 4th, insulating resin packaging part, the 5th, tested sample, the 6th, grounding electrode plate, the 7th, upper metal high voltage electrode column, the 8th, insulator abutment ring, the 9th, insulation gasket ring, the 10th, lower metal high voltage electrode column.
Embodiment
The high-field electrode device that is used for the pulse electroacoustic method space charge measuring system that the present invention proposes, its structure as shown in Figure 2, comprise metal shielding 1, insulating supporting post 2, insulating resin packaging part 4 and grounding electrode plate 6, also comprise metal high voltage electrode column 7, insulator abutment ring 8, lower metal high voltage electrode column 10 and insulation gasket ring 9.Insulating supporting post 2 is relative fixing up and down with upper metal high voltage electrode column 7, and is encapsulated in metal shielding 1 by insulating resin packaging part 4.Lower metal high voltage electrode column 10 is placed in the bottom of metal high voltage electrode column 7, is provided with insulation gasket ring 9 between upper metal high voltage electrode column 7 and lower metal high voltage electrode column 10.Insert in the cavity of upper metal high voltage electrode column 7 upper end of insulator abutment ring 8, and the lower end of insulator abutment ring 8 is passed in the cavity of metal high voltage electrode column 10 under the rear insertion of insulation gasket ring 9, and the structure of insulator abutment ring 8 as shown in Figure 3.Grounding electrode plate 6 is placed in the below of metal shielding 1, and tested sample 5 is placed between grounding electrode plate 6 and lower metal high voltage electrode column 10.
the novel practical high-field electrode device that is used for the pulse electroacoustic method space charge measuring system that the present invention proposes, its structure as shown in Figure 2, comprise the grounded metallic shield shell, the insulator support column of fixing in metal shielding, the upper metal high voltage electrode column that is connected with the lower end of this support column, insulator gasket ring below upper metal high voltage electrode column, lower metal high voltage electrode column below the insulator gasket ring, be used for connecting upper metal high voltage electrode column, the insulation gasket ring, the insulator abutment ring of lower metal high voltage electrode column, be used for being filled in metal high voltage electrode column insulating resin packaging part on every side, and the grounding electrode plate that is placed in lower metal high voltage electrode column below.Apparatus of the present invention are divided into fixing upper metal electric pole and the lower metal electric pole that can be convenient for changing with the former metal electric pole that fixes, adopt simultaneously the upper metal electric pole of insulation gasket ring isolation and lower metal electric pole, utilize the insulator abutment ring that the three is connected as a whole, can place the resistance of different resistances in the insulator abutment ring.
Below in conjunction with accompanying drawing, principle of work and the course of work of high-field electrode device of the present invention is elaborated:
the novel practical high-field electrode apparatus structure that is used for the pulse electroacoustic method space charge measuring system of the present invention's design as shown in Figure 2, comprise grounded metallic shield shell 1, the insulating supporting post 2 of fixing in metal shielding 1, the upper metal high voltage electrode column 7 that is connected with this support column lower end, insulator gasket ring 9 below upper metal high voltage electrode column 7, lower metal high voltage electrode column 10 below insulator gasket ring 9, be used for connecting upper metal high voltage electrode column 7, insulation gasket ring 9, the insulator abutment ring 8 of lower metal high voltage electrode column 10, be used for being filled in metal high voltage electrode column insulating resin packaging part 4 on every side, and the grounding electrode plate 6 that is placed in lower metal high voltage electrode column 10 belows.
First sample is placed on grounding electrode plate during work, adjusts scheme according to the thickness of sample by the circuit parameter that simulation calculation and actual measurement provide the high-field electrode device, put into the resistance of suitable resistance in the middle of insulator abutment ring 8.Then utilize insulator abutment ring 8 that insulator gasket ring 9 is fixed on upper metal high voltage electrode column 7, more lower metal high voltage electrode column 10 is screwed onto on insulator abutment ring 8.Pass through like this effect of insulator abutment ring 8, upper metal high voltage electrode column 7, insulator gasket ring 9, lower metal high voltage electrode column 10 has connected into an integral body.
The present invention can change easily lower metal high voltage electrode column 10 and can not change other parameters of high-field electrode device, guaranteed that the surface of metal electrode that contacts with sample in the measuring process is smooth smooth, make measurement result more accurately credible, be beneficial to the comparative analysis of data, improved the practicality of high-field electrode device.Make simultaneously the user can facilitate, comprehensively the Investigation of Metal Surface emission on the dielectric space charge produce, the impact of accumulation process.In addition, variation according to sample thickness, can change the resistance that is placed in insulator abutment ring 8 and realize the optimum matching of wave impedance, improve the high-voltage pulse that acts on sample, improve accuracy and the practicality of pulse radio-acoustic method space charge measuring system.
Claims (1)
1. high-field electrode device that is used for the pulse electroacoustic method space charge measuring system, comprise metal shielding, insulating supporting post, insulating resin packaging part and grounding electrode plate, characterized by further comprising metal high voltage electrode column, insulator abutment ring, lower metal high voltage electrode column and insulation gasket ring; Described insulating supporting post is relative fixing up and down with upper metal high voltage electrode column, and is encapsulated in metal shielding by the insulating resin packaging part; Described lower metal high voltage electrode column is placed in the bottom of metal high voltage electrode column, is provided with the insulation gasket ring between upper metal high voltage electrode column and lower metal high voltage electrode column; Insert in the cavity of upper metal high voltage electrode column the upper end of described insulator abutment ring, and insert in the cavity of lower metal high voltage electrode column after passing the insulation gasket ring lower end of insulator abutment ring; Described grounding electrode plate is placed in the below of metal shielding, and tested sample is placed between grounding electrode plate and lower metal high voltage electrode column.
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Cited By (9)
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| CN103543339A (en) * | 2013-10-31 | 2014-01-29 | 国家电网公司 | Method and device for analyzing alternating current-and-direct current space charge test data of dielectric sample |
| CN103884973A (en) * | 2014-04-14 | 2014-06-25 | 上海交通大学 | Needle-plate electrode medium space charge and partial-discharge ultrahigh-frequency signal synchronous measurement device |
| CN103969517A (en) * | 2014-04-21 | 2014-08-06 | 清华大学 | Pressure-adjustable high-voltage electrode device for space charge measurement |
| CN105738711A (en) * | 2016-02-22 | 2016-07-06 | 清华大学 | High-voltage electrode device used for space charge measurement |
| CN105911326A (en) * | 2016-04-18 | 2016-08-31 | 清华大学 | Conduction current-space charge combined measurement device |
| CN106249064A (en) * | 2016-07-12 | 2016-12-21 | 清华大学 | Insulation self-recovering type space charge measurement high-field electrode device |
| CN106443216A (en) * | 2016-09-05 | 2017-02-22 | 西安交通大学 | Multilayer solid composite dielectric material space charge measurement method |
| CN106597040A (en) * | 2016-12-22 | 2017-04-26 | 中国西电电气股份有限公司 | Wave modulation device and test circuit for square-wave impulse current test |
| CN109991482A (en) * | 2017-12-29 | 2019-07-09 | 上海交通大学 | The simulation electrode device of cable insulation space charge detection |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103543339A (en) * | 2013-10-31 | 2014-01-29 | 国家电网公司 | Method and device for analyzing alternating current-and-direct current space charge test data of dielectric sample |
| CN103884973A (en) * | 2014-04-14 | 2014-06-25 | 上海交通大学 | Needle-plate electrode medium space charge and partial-discharge ultrahigh-frequency signal synchronous measurement device |
| CN103969517A (en) * | 2014-04-21 | 2014-08-06 | 清华大学 | Pressure-adjustable high-voltage electrode device for space charge measurement |
| CN105738711B (en) * | 2016-02-22 | 2019-01-15 | 清华大学 | Space charge measurement high-field electrode device |
| CN105738711A (en) * | 2016-02-22 | 2016-07-06 | 清华大学 | High-voltage electrode device used for space charge measurement |
| CN105911326A (en) * | 2016-04-18 | 2016-08-31 | 清华大学 | Conduction current-space charge combined measurement device |
| CN105911326B (en) * | 2016-04-18 | 2018-11-09 | 清华大学 | Conduction current-space charge combined measurement device |
| CN106249064A (en) * | 2016-07-12 | 2016-12-21 | 清华大学 | Insulation self-recovering type space charge measurement high-field electrode device |
| CN106249064B (en) * | 2016-07-12 | 2019-05-31 | 清华大学 | Insulate self-recovering type space charge measurement high-field electrode device |
| CN106443216A (en) * | 2016-09-05 | 2017-02-22 | 西安交通大学 | Multilayer solid composite dielectric material space charge measurement method |
| CN106443216B (en) * | 2016-09-05 | 2019-02-05 | 西安交通大学 | A kind of multi-layer solid composite dielectric material space charge measurement method |
| CN106597040A (en) * | 2016-12-22 | 2017-04-26 | 中国西电电气股份有限公司 | Wave modulation device and test circuit for square-wave impulse current test |
| CN109991482A (en) * | 2017-12-29 | 2019-07-09 | 上海交通大学 | The simulation electrode device of cable insulation space charge detection |
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