CN105652101A - Temperature control type electro-acoustical pulse-method space charge measuring device - Google Patents
Temperature control type electro-acoustical pulse-method space charge measuring device Download PDFInfo
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- CN105652101A CN105652101A CN201610113671.8A CN201610113671A CN105652101A CN 105652101 A CN105652101 A CN 105652101A CN 201610113671 A CN201610113671 A CN 201610113671A CN 105652101 A CN105652101 A CN 105652101A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R29/24—Arrangements for measuring quantities of charge
Abstract
The invention discloses a temperature control type electro-acoustical pulse-method space charge measuring device. The temperature control type electro-acoustical pulse-method space charge measuring device comprises a direct-current voltage source inputting device for exerting direct-current voltage on the first end face of a measured sample, a pulse voltage inputting device for exerting pulse voltage on the first end face of the measured sample, a metal electrode in contact with the second end face of the measured sample, a temperature regulation and control unit for conducting temperature regulation and control on at least one of the first end face and the second end face of the measured sample, a piezoelectric sensor, a piezoelectric sensor temperature protection unit for regulating and controlling the working temperature of the piezoelectric sensor, and a signal outputting unit for outputting data converted by the piezoelectric sensor. The temperature control type electro-acoustical pulse-method space charge measuring device has the following advantages that a wide-temperature-range regulation and control function, a temperature gradient regulation and control function and a quantitative regulation and control function of multi-physical-field coupling conditions can be achieved, further has the advantages of being small in size and adopting high-voltage-resistance electrode structure design, can meet the measurement demands of insulation materials different in thickness and is simple to manufacture and convenient to operate.
Description
Technical field
The present invention relates to solid dielectric material technical field of performance test, be specifically related to a kind of temperature control type pulse electroacoustic method space charge measurement device.
Background technology
In recent years, along with space charge distribution measurement techniques obtains huge progress, the research of solid dielectric space charge has become the study hotspot in domestic and international High-Voltage Insulation field. Space charge distribution measurement techniques is the basis of space charge research. The development of space charge distribution measurement techniques is mutually promoted with the research of dielectric substance electrology characteristic. Space charge distribution measurement techniques can be used for the research of the performance parameter such as carrier mobility, trap depth in electrolyte, and plays an important role in the exploitation of dielectric substance and assessment.
Along with the continuous propelling of China's extra-high voltage direct-current transmission engineering, high voltage DC power cable faces huge opportunity to develop and challenge. At present, a Main Bottleneck of high voltage direct current cable technical development is cable major insulation problems with space charge. Different from AC field, under DC electric field, dielectric is under electrode effect for a long time, and space charge is easier to series dynamic evolution process, as injected, migrate, gather and dissipation, and along with the distortion of material internal electric field.
In addition, under alternating voltage effect, Electric Field Distribution depends on insulant dielectric constant, and at a dc voltage, cable major insulation Electric Field Distribution depends on insulant electrical conductivity, and insulant electrical conductivity is subject to the impact of the factors such as temperature, humidity, electric field intensity and pressing time, all can extreme influence to the dynamic process of dielectric space electric charge. The operation of actual high-voltage direct current cables is formed temperature gradient field from inside to outside due to conductor temp .-elevating, the thermally sensitive electrical conductivity distribution gradient of insulating material of polymer, which dictates that electric field generation polarity inversion, cause that the electric charge on high temperature side electrode (core led by cable) is more easy to injection and migrates, exacerbate the charge buildup being positioned at cable insulation outer layer outer surface and field intensity distortion, reduce insulated electro breakdown strength, more easily cause the cable destruction when power-off or polarity of voltage are reversed.
Pulse electroacoustic method space charge distribution measurement techniques is presently the most one of general measurement technology. One important development direction of this measurement technology, it is simply that integrated temperature adjusting function, to adapt to the research of insulant space charge characteristic under temperature field. This has been paid huge effort by Chinese scholars, successfully develops difference and has the space charge measuring system of temperature-control performance. 1996, T.Takada installed the Lithium metaniobate (LiNbO of heating collar, apolegamy high-temperature resistant by high-field electrode shell3) piezoelectric membrane, develop maximum temperature and reach the space charge measuring system of 100 DEG C. In the same year, M.Fukuma selects same LiNbO3Piezoelectric membrane, utilizes the function of temperature control that silicone oil mode of heating achieves the highest 100 DEG C. 2004; Y.Muramoto achieves 90 DEG C of temp. control functions of upper electrode based on Kynoar (PVDF) piezoelectric membrane; the temperature of bottom electrode, by designing a cooling back installation, promotes its maximum temperature less than 75 DEG C, to protect PVDF piezoelectric membrane.
The principal element limiting pulse electroacoustic method space charge distribution measurement techniques function of temperature control at present is the heat resistance of piezoelectric transducer. The PVDF piezoelectric membrane of commerical grade, maximum operating temperature is only capable of reaching about 75 DEG C. Another kind of piezoelectric ceramics is LiNbO3, different from PVDF polymerizable material, LiNbO3Belonging to ceramic-like material, its Curie-point temperature is up to 1000 DEG C, and normal working temperature also up to more than 300 DEG C, has development potentiality very much. But it not yet has film product to emerge at present, there is an other seminar in Japan by researching and developing voluntarily, is prepared for the micron-sized LiNbO of small lot3Piezoelectric membrane, and the application tentatively obtained. As a whole, current PVDF piezoelectric membrane is still that the first-selection of space charge distribution measurement techniques, but how to protect PVDF piezoelectric membrane under the high temperature conditions, is the problem to consider of existing pulse electroacoustic method space charge measuring system temperature control design.
Summary of the invention
It is contemplated that at least solve one of above-mentioned technical problem.
For this, it is an object of the present invention to propose a kind of temperature control type pulse electroacoustic method space charge measurement device.
To achieve these goals, embodiment of the invention discloses that a kind of temperature control type pulse electroacoustic method space charge measurement device, including: direct voltage source gatherer, for importing the DC voltage that the first end face to sample applies; Pulse voltage source gatherer, for importing the pulse voltage that the first end face to sample applies; Metal electrode, and the second end contact of sample, wherein, the opposite face of first end face that the second end face is sample of sample; Temperature regulation unit, for carrying out temperature adjusting at least one end face in the first end face of sample and the second end face; Piezoelectric transducer, is connected with metal electrode; Piezoelectric transducer temperature protection unit, for regulating and controlling the operating temperature of piezoelectric transducer; Signal lead-out unit, is connected with piezoelectric transducer, derives for the signal changed by piezoelectric transducer.
Temperature control type pulse electroacoustic method space charge measurement device according to embodiments of the present invention, it is possible to achieve the quantitatively regulating and controlling function of wide temperature range adjusting function, thermograde adjusting function and multiple physical field coupling condition; Additionally, the application also has small size, high pressure electrode structural designs feature, it is suitable for the measurement demand of different-thickness insulant, and makes simple, easy to operate.
It addition, temperature control type pulse electroacoustic method space charge measurement device according to the above embodiment of the present invention, it is also possible to there is following additional technical characteristic:
Further, described direct voltage source gatherer includes high-pressure metal electrode and metal conducting bar (8), high-pressure metal electrode and metal conducting bar connection;Described pulse voltage source gatherer includes pulse conducting rod, high-voltage capacitance and resistance, and pulse conducting rod is connected with high-pressure metal electrode by high-voltage capacitance, and the node between one end of resistance with high-voltage capacitance and pulse conducting rod is connected, other end ground connection.
Further, also include metallic shield, metallic shield is provided for metal conducting bar (8) and through hole that pulse conducting rod penetrates; Metal electrode includes the first end of the first end and the second end, metallic shield and metal electrode and removably connects, and the second end of metal electrode is connected with piezoelectric transducer.
Further, described temperature regulation unit includes: heating tape, is embedded in metallic shield cover outer wall; Insulating resin, is close to metallic shield inwall and wraps up high-pressure metal electrode; Heater, is positioned close to inside the metal electrode of sample; Wherein, high-pressure metal electrode is arranged on inside metallic shield, and the top of insulating resin is provided with insulating barrier, and insulating barrier is provided for the through hole of metal conducting bar traverse, forms air insulating layer between insulating barrier and metallic shield.
Further, described piezoelectric transducer temperature protection unit includes: cavity, and one end of cavity is positioned close to inside the metal electrode of piezoelectric transducer; Thermal insulation board, is arranged on cavity inner wall also near the second end face of sample; Cooling medium enters passage, and one end connects with cavity, and the other end passes metal electrode; Cooling medium passing away, one end connects with cavity, and the other end passes metal electrode.
Further, also include: wave absorption module, be close to piezoelectric transducer lower surface and be connected with described signal lead-out unit, for absorbing the sound wave from piezoelectric transducer traverse, it is prevented that acoustic reflection back pressure electric transducer interferes.
Further, the metal shielding that signal lead-out unit is impacted by shielding external interference signals is also included.
The additional aspect of the present invention and advantage will part provide in the following description, and part will become apparent from the description below, or is recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage are from conjunction with will be apparent from easy to understand the accompanying drawings below description to embodiment, wherein:
Fig. 1 is the structural representation of the temperature control type pulse electroacoustic method space charge measurement device of one embodiment of the invention;
Fig. 2 is the partial enlarged drawing of the temperature control type pulse electroacoustic method space charge measurement device of one embodiment of the invention.
Detailed description of the invention
Being described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of same or like function from start to finish. The embodiment described below with reference to accompanying drawing is illustrative of, and is only used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not considered as limiting the invention. additionally, term " first ", " second " are only for descriptive purposes, and it is not intended that indicate or hint relative importance.
In describing the invention, it is necessary to explanation, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or connect integratedly;Can be mechanically connected, it is also possible to be electrical connection; Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be the connection of two element internals. For the ordinary skill in the art, it is possible to concrete condition understands above-mentioned term concrete meaning in the present invention.
With reference to as explained below and accompanying drawing, it will be clear that these and other aspects of embodiments of the invention. Describe at these and in accompanying drawing, specifically disclose some particular implementation in embodiments of the invention, representing some modes of the principle implementing embodiments of the invention, but it is to be understood that the scope of embodiments of the invention is not limited. On the contrary, all changes within the scope of embodiments of the invention include falling into attached claims spirit and intension, amendment and equivalent.
Below in conjunction with accompanying drawing, temperature control type pulse electroacoustic method space charge measurement device according to embodiments of the present invention is described.
Refer to Fig. 1; a kind of temperature control type pulse electroacoustic method space charge measurement device, including direct voltage source gatherer, pulse voltage source gatherer, metal electrode 16, temperature regulation unit, piezoelectric transducer 20, piezoelectric transducer temperature protection unit and signal lead-out unit.
Direct voltage source gatherer, for importing the DC voltage that the first end face to sample 15 applies.
In an example of the present invention, direct voltage source gatherer includes high-pressure metal electrode 6 and metal conducting bar 8, and it is internal that metal conducting bar 8 is positioned at DC insulation annular tube 9, is guided to by DC high voltage on high-pressure metal electrode 6.
Pulse voltage source gatherer, for importing the pulse voltage that the first end face to sample 15 applies.
In an example of the present invention, pulse voltage source gatherer includes pulse conducting rod 12, high-voltage capacitance 13 and resistance 10. Pulse conducting rod 12 is connected with high-pressure metal electrode 6 by high-voltage capacitance 13. Node between one end of resistance 10 with high-voltage capacitance 13 and pulse conducting rod 12 is connected, other end ground connection.
Specifically, resistance 10 is arranged in air insulating layer 2, and its effect is that high-voltage pulse is carried out impedance matching, to reduce the reflecting component of high-voltage pulse, is effectively improved the amplitude of the pulse voltage being applied on sample 15. Pulse insulated sleeve 11 is cylindrical hollow elongate structure, penetrates from grounded metallic shield cover 3 side, high-voltage pulse and grounded metallic shield cover 3 is insulated. Pulse conducting rod 12 is arranged in pulse insulated sleeve 11 inside and is connected with internal circuit at air insulating layer 2, is incorporated into by high-voltage pulse on high-pressure metal electrode 6. High-voltage capacitance 13 is packaged in insulating resin 5 and is connected with high-pressure metal electrode 6, plays isolated DC high voltage and by the purpose of pulse voltage.
Second end contact of metal electrode 16 and sample 15. Wherein, the opposite face of first end face that the second end face is sample 15 of sample 15.
Temperature regulation unit, for carrying out temperature adjusting at least one end face in the first end face of sample 15 and the second end face.
In one embodiment of the invention, temperature regulation unit includes heating tape 7, insulating resin 5 and heater 1.
Specifically, heater 1 is positioned at metal electrode 16, and near the lower surface of sample 15, for the temperature of fixing quantity sample 15 lower surface. Heating tape 7 structure ringwise, is enclosed within grounded metallic shield cover 3 exterior lateral sides groove, by heating grounded metallic shield cover 3, and conducts heat through insulating resin 5, the temperature of regulation and control high-pressure metal electrode 6.Insulating resin 5 is filled in grounded metallic shield cover 3 and is isolated by insulating barrier 4 and air insulating layer 2, fixes and seals the components and parts such as high-pressure metal electrode 6, DC insulation annular tube 9 and high-voltage capacitance, can be effectively improved the reliability of insulation. Insulating barrier 4 is against grounded metallic shield cover 3 inwall milling place, and its central hole is for DC insulation annular tube 9 traverse, and air-isolation insulating barrier 2 and insulating resin 5. Air insulating layer 5 is between the top cover and insulating barrier 4 of grounded metallic shield cover 3, and its effect is Insulating A High-Voltage pulse signal.
Piezoelectric transducer 20 is connected with metal electrode 16, and acoustic signals is converted to voltage signal.
Piezoelectric transducer temperature protection unit, for regulating and controlling the operating temperature of piezoelectric transducer 20.
Refer to Fig. 2, in one embodiment of the invention, piezoelectric transducer temperature protection unit includes cavity 18, thermal insulation board 24, cooling medium entrance passage 19 and cooling medium passing away 17. The metal electrode 16 that one end of cavity 18 is positioned close to piezoelectric transducer 20 is internal. Cooling medium enters one end of passage 19 and connects with cavity 18, and the other end passes metal electrode 16. Cooling medium passing away 17, one end connects with cavity 18, and the other end passes metal electrode 16. Thermal insulation board 24 is arranged on cavity 18 inwall also near the second end face of sample 15. Entering passage 19 by cooling medium and fill cooling medium to cavity 1, the effect of cooling medium is that the surface to piezoelectric transducer 20 lowers the temperature, and thermal insulation board 24 reduces the impact on sample 15 lower surface metal electrode 16 temperature as far as possible simultaneously.
Signal lead-out unit is connected with piezoelectric transducer 20, derives for the data changed by piezoelectric transducer 20.
In one embodiment of the invention, signal lead-out unit includes metal guide core 22, holding wire 29, signal amplifier 27 and signaling interface 28. The voltage signal changed by piezoelectric transducer 20 is delivered to signal amplifier 27 by the holding wire 29 of metal guide core 22 and is amplified, then pass to signal analysis equipment through signaling interface 28 and carry out signal analysis, the space charge characteristic of testing sample 15 can be learnt by signal analysis result.
In one embodiment of the invention, also include metal shielding 26, at grounding plate 25 lower surface, be used for shielding external interference signal.
In one embodiment of the invention, wave absorption module 21 it is provided with between piezoelectric transducer 20 and metal guide core 22, wave absorption module 21 is for absorbing the sound wave from piezoelectric transducer 20 traverse, prevent acoustic reflection back pressure electric transducer 20 from interfering, the impact testing result precision to sample 15.
In one embodiment of the invention, temperature control type pulse electroacoustic method space charge measurement device also includes metallic shield 3, and the first end of metallic shield 3 and metal electrode 16 removably connects. Grounded metallic shield cover 3 has three aspect effects: one is shielding external interference, and two is the processing safety being improved measurement apparatus by ground connection, and three is fixing heating tape 7.
In order to make those skilled in the art be more clearly understood from the present invention, the temperature control type pulse electroacoustic method space charge measurement device of the present invention will be introduced by following steps:
Silicone oil is dripped in metal electrode 16 upper face center position in fig. 2, subsequently sample 15 is placed on and drips metal electrode 16 central authorities having silicone oil, make high-pressure metal electrode 6, semi-conductive layer 14 and sample 15 keep certain pressure after fixing, form the effect of close contact.Wherein, silicone oil (layer) is the air gap in order to eliminate contact surface, to improve sonic propagation effect. After design temperature preheating, apply high-voltage pulse and DC high voltage, be superimposed upon on sample 15 simultaneously, carry out the test of space charge characteristic.
The present invention independent temperature control by sample 15 upper and lower surface, and in conjunction with cooling medium 18, piezoelectric transducer 20 is lowered the temperature, to realize thermograde or the isothermal test conditions of wide temperature range. Meanwhile, this design structure is being close to the placement temperature sensor of sample 15 position such that it is able to measure sample 15 upper and lower surface temperature, it is achieved the measurement of space charge under quantitatively regulating and controlling multiple physical field coupling condition.
It addition, other of the temperature control type pulse electroacoustic method space charge measurement device of the embodiment of the present invention is constituted and effect is all known for a person skilled in the art, in order to reduce redundancy, do not repeat.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment or the example of the present invention. In this manual, the schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example. And, the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: these embodiments can being carried out multiple change, amendment, replacement and modification when without departing from principles of the invention and objective, the scope of the present invention is by claim and equivalency thereof.
Claims (7)
1. a temperature control type pulse electroacoustic method space charge measurement device, it is characterised in that including:
Direct voltage source gatherer, for importing the DC voltage that the first end face to sample (15) applies;
Pulse voltage source gatherer, for importing the pulse voltage that the first end face to sample (15) applies;
Metal electrode (16), with the second end contact of sample (15), wherein, the second end face of sample (15) is the opposite face of the first end face of sample (15);
Temperature regulation unit, for carrying out temperature adjusting at least one end face in the first end face of sample (15) and the second end face;
Piezoelectric transducer (20), is connected with metal electrode (16);
Piezoelectric transducer temperature protection unit, for regulating and controlling the operating temperature of piezoelectric transducer (20);
Signal lead-out unit, is connected with piezoelectric transducer (20), derives for the signal changed by piezoelectric transducer (20).
2. temperature control type pulse electroacoustic method space charge measurement device according to claim 1, it is characterized in that, described direct voltage source gatherer includes high-pressure metal electrode (6) and metal conducting bar (8), high-pressure metal electrode (6) and metal conducting bar (8) and connects;
Described pulse voltage source gatherer includes pulse conducting rod (12), high-voltage capacitance (13) and resistance (10), pulse conducting rod (12) is connected with high-pressure metal electrode (6) by high-voltage capacitance (13), node between one end of resistance (10) with high-voltage capacitance (13) and pulse conducting rod (12) is connected, other end ground connection.
3. temperature control type pulse electroacoustic method space charge measurement device according to claim 2, it is characterized in that, also include metallic shield (3), metallic shield (3) is provided for metal conducting bar (8) and through hole that pulse conducting rod (12) penetrates;
Metal electrode (16) includes the first end and the second end, first end of metallic shield (3) and metal electrode (16) removably connects, and the second end of metal electrode (16) is connected with piezoelectric transducer (20).
4. temperature control type pulse electroacoustic method space charge measurement device according to claim 3, it is characterised in that described temperature regulation unit includes:
Heating tape (7), is embedded in metallic shield (3) outer wall;
Insulating resin (5), is close to metallic shield (3) inwall and wraps up high-pressure metal electrode (6);
Heater (1), the metal electrode (16) being positioned close to sample (15) is internal;
Wherein, it is internal that high-pressure metal electrode (6) is arranged on metallic shield (3), the top of insulating resin (5) is provided with insulating barrier (4), insulating barrier (4) is provided for the through hole of metal conducting bar (8) traverse, between insulating barrier (4) and metallic shield (3), forms air insulating layer (2).
5. temperature control type pulse electroacoustic method space charge measurement device according to claim 1, it is characterised in that described piezoelectric transducer temperature protection unit includes:
Cavity (18), the metal electrode (16) that one end of cavity (18) is positioned close to piezoelectric transducer (20) is internal;
Thermal insulation board (24), is arranged on cavity (18) inwall also near the second end face of sample (15);
Cooling medium enters passage (19), and one end connects with cavity (18), and the other end passes metal electrode (16);
Cooling medium passing away (17), one end connects with cavity (18), and the other end passes metal electrode (16).
6. temperature control type pulse electroacoustic method space charge measurement device according to claim 1, it is characterised in that also include:
Wave absorption module (21), it is close to piezoelectric transducer (20) lower surface and is connected with described signal lead-out unit, for absorbing the sound wave from piezoelectric transducer (20) traverse, it is prevented that acoustic reflection back pressure electric transducer (20) interferes.
7. temperature control type pulse electroacoustic method space charge measurement device according to claim 1, it is characterised in that also include the metal shielding (26) that signal lead-out unit is impacted by shielding external interference signals.
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| CN106249064A (en) * | 2016-07-12 | 2016-12-21 | 清华大学 | Insulation self-recovering type space charge measurement high-field electrode device |
| CN106645866A (en) * | 2016-10-25 | 2017-05-10 | 清华大学 | Conduction current and space charge synchronization measurement device |
| CN107621578A (en) * | 2017-11-07 | 2018-01-23 | 清华大学 | A kind of pulse electroacoustic method space charge measurement device of superhigh temperature |
| CN108089068A (en) * | 2017-12-08 | 2018-05-29 | 西安交通大学 | Compound slab sample three dimensions charge detecting device based on pulse electroacoustic method |
| CN109142894A (en) * | 2018-07-05 | 2019-01-04 | 清华大学 | The test method of DC wire corona space charge distribution based on coupling principle of equipotentiality |
| CN114137281A (en) * | 2021-11-25 | 2022-03-04 | 北京交通大学 | Space charge evaluation method based on conductive current |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106249064B (en) * | 2016-07-12 | 2019-05-31 | 清华大学 | Insulate self-recovering type space charge measurement high-field electrode device |
| CN106645866A (en) * | 2016-10-25 | 2017-05-10 | 清华大学 | Conduction current and space charge synchronization measurement device |
| CN107621578A (en) * | 2017-11-07 | 2018-01-23 | 清华大学 | A kind of pulse electroacoustic method space charge measurement device of superhigh temperature |
| CN108089068A (en) * | 2017-12-08 | 2018-05-29 | 西安交通大学 | Compound slab sample three dimensions charge detecting device based on pulse electroacoustic method |
| CN108089068B (en) * | 2017-12-08 | 2020-03-17 | 西安交通大学 | Composite flat plate sample three-dimensional space charge measuring device based on electroacoustic pulse method |
| CN109142894A (en) * | 2018-07-05 | 2019-01-04 | 清华大学 | The test method of DC wire corona space charge distribution based on coupling principle of equipotentiality |
| CN114137281A (en) * | 2021-11-25 | 2022-03-04 | 北京交通大学 | Space charge evaluation method based on conductive current |
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