CN101706537B - PEA space charge test device capable of testing conductive current - Google Patents
PEA space charge test device capable of testing conductive current Download PDFInfo
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- CN101706537B CN101706537B CN200910237694XA CN200910237694A CN101706537B CN 101706537 B CN101706537 B CN 101706537B CN 200910237694X A CN200910237694X A CN 200910237694XA CN 200910237694 A CN200910237694 A CN 200910237694A CN 101706537 B CN101706537 B CN 101706537B
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Abstract
The invention belongs to the technical field of high voltage and insulation, and in particular relates to a PEA space charge test device capable of testing conductive current; the test device consists of a top electrode, a bottom electrode, a space charge collection channel, a current signal collection channel, and a pulse input channel; the top electrode is casted by epoxy resin to fix the metal shell of the top electrode and the central electrode of the top electrode to form an integral and movable top electrode; the bottom electrode is a tri-electrode structure composed of a bottom electrode external ring, a bottom electrode internal ring and a bottom electrode central column in a coaxial way; the bottom electrode external ring, the bottom electrode internal ring and the bottom electrode central column respectively realize the functions of inputting pulse, collecting conductive current signal and collecting space charge PEA signal; DC voltage and high voltage narrow pulse are respectively introduced in from two sides of a sample to avoid coupling with the DC high voltage and pulse, thus eliminating influence of surface current of the sample, solving the problem that pulsed electro-acoustic method (PEA) can not test conductive current, realizing synchronous test of sample conductive current and space charge, and being especially suitable for field of electronic engineering insulation material.
Description
Technical field
The invention belongs to the high voltage and insulation technology field, particularly a kind of PEA space charge proving installation of surveying conduction current.
Background technology
Space charge is an important parameter that characterizes the dielectric substance electric property, and the research that space charge is measured for the dielectric dielectric properties has great significance.At present, generally acknowledge generally that in the world space charge has the distortion effect to electric field, distribution of space charges and motion to the electricity of insulating material lead, puncture destructions, wearing out or the like has intense influence.Under electric field action, especially DC electric field, space charge gathers Electric Field Distribution in the polymkeric substance that can seriously distort, store the electromechanical energy, and cause the compound of electric charge and the excitation, thereby cause the material early damage, as increase thermionic generating rate, the energy barrier that reduces material aging, the generation that causes scission of link, micropore expansion and internal stress, and finally cause material breakdown.Therefore, the change that the existence of space charge, transfer and disappearance can directly cause the insulating material internal electric field to distribute is played the effect that weakens or strengthen to the internal field of material internal, has influence on the various aspects of material electrical specification.
Aspect space charge research, at present domestic and international what do mostly is the research of experimental, and to concentrate on the cable insulation be on the polythene material of application background.Along with test and measurement data perfect, the research work of present many theoretical explanations, modelling has also all been carried out.Be still an outstanding issue yet how trapped charge influences the performance of material.Studies show that the change of density of trapping charges causes electric charge to go into to fall into the change of transmission course, finally influences mobility of charge carrier, be reflected on the macroscopic view in the variation that electricity leads.
As everyone knows, the orientation of electric charge moves the formation electric current, thereby the effect of dielectric inherent vice can make the resident formation of charge carrier space charge again, mobility of charge carrier, go into to fall into and the formation of explanation such as detrapping space charge and the electric field change that therefore produces, the capital exerts an influence to conduction current, so the relation of exploring between electric current and the space charge can provide new approach for the microscopic characteristics of analysis of material inside.
The space charge measuring method has a variety of, and the high fields of Japan musashi polytechnical university reach electroacoustic pulse (PEA) method that male professor is proposed but use most often at present.The present basic comparative maturity of equipment of the measurement space electric charge of making of the method, though traditional space charge proving installation has many good qualities, have the following disadvantages: function is simple; Pulse input end mouth and high voltage input port be utmost point introducing from power on all, causes coupling easily; Can only apply DC voltage; Can't measure the conduction current that is flow through in the material in the course of exerting pressure.Therefore need design one cover can measure the PEA test macro of conduction current and space charge simultaneously, above-mentioned prior art is measured in solution at present can not connect the problem of studying with conduction current and space charge.
Summary of the invention
The objective of the invention is conduction current and space charge to be connected the problem of studying at present described in the background technology in order to solve, a kind of PEA space charge proving installation of surveying conduction current is provided, it is characterized in that, measurement mechanism mainly is made up of five parts, i.e. top electrode, bottom electrode, space charge acquisition channel, current signal acquisition channel and pulse input channel.Bottom electrode dividing plate 10 is the insulcrete of rectangle, the bottom electrode newel 13 of truncated cone is bottom-up to be fixed in the circular hole at bottom electrode dividing plate 10 middle parts, ring 11 and bottom electrode outer shroud 12 and bottom electrode newel 13 coaxial being embedded in the bottom electrode dividing plate 10 in the bottom electrode, bottom electrode newel 13, the ring 11 and the upper surface of bottom electrode outer shroud 12 and the upper surface of bottom electrode dividing plate 10 constitute the bottom electrode plane in the bottom electrode in same plane, piezoelectric sensor 14 places under bottom electrode newel 13 lower surfaces, the organic glass post 15 of metal-coated membrane places under the piezoelectric sensor 14, bottom electrode newel insulation sleeve 18 coats bottom electrode newel 13 bottoms, the organic glass post 15 of piezoelectric sensor 14 and metal-coated membrane places in the space charge collector metal shell 19, space charge collector metal shell 19 is fixed in the lower surface of bottom electrode dividing plate 10 with piezoelectric sensor 14, the organic glass post 15 of metal-coated membrane and bottom electrode newel insulation sleeve 18 compress with bottom electrode newel 13 lower surfaces, the bottom electrode metal shell 20 of rectangular parallelepiped is fixed in the lower surface of bottom electrode dividing plate 10, charge signal SMA coaxial socket 16 is fixed in space charge collector metal shell 19 center holes, the golden film that the inner wire of charge signal SMA coaxial socket 16 passes organic glass post 15 lower surfaces of bottom electrode newel insulation sleeve 18 and metal-coated membrane reliably electrically contacts, charge signal prime amplifier 26 places in the bottom electrode metal shell 20, charge signal prime amplifier 26 input ends are connected with charge signal SMA coaxial socket 16, output terminal is connected with the charge signal SMA coax plug 17 that is fixed in bottom electrode metal shell 20 left side walls, the coaxial bend cutting seat 21 of current signal SMA is fixed in the lower surface of bottom electrode dividing plate 10, the inner wire of the coaxial bend cutting seat 21 of current signal SMA is connected with ring electrode 11 in the bottom electrode, place current-limiting resistance 25 1 ends in the bottom electrode metal shell 20 to be connected with the inner wire of the coaxial bend cutting seat 21 of current signal SMA, the other end is connected with the current signal SMA coax plug 22 that is fixed in bottom electrode metal shell 20 left side walls, the coaxial bend cutting seat 23 of pulse input SMA is fixed in the lower surface of bottom electrode dividing plate 10, the inner wire of the coaxial bend cutting seat 23 of pulse input SMA is connected with bottom electrode outer ring electrode 12, and pulse input SMA coax plug 24 is fixed in bottom electrode metal shell 20 right side walls and is connected with the coaxial bend cutting seat 23 usefulness bare conductors of pulse input SMA;
High pressure BNC socket 1 is enclosed within the center pit that is fixed in columniform top electrode metal shell 3 in the electro-insulating rubber circle 2, top electrode central electrode 4 places in the top electrode metal shell 3, the lower surface of top electrode central electrode 4 and top electrode metal shell 3 lower surfaces are in same plane, the upper surface of top electrode central electrode 4 is connected with bare conductor with the inner wire of high pressure BNC socket 1, epoxy resin 5 is cast in top electrode metal shell 3 inside, top electrode metal shell 3 and top electrode central electrode 4 fixing integrant removable top electrodes, top electrode base 7 and bottom electrode newel electrode 13 coaxial bottom electrode dividing plate 10 upper surfaces that are fixed in, sample 9 places on the bottom electrode plane, semiconduction pad 8 places on the sample 9, whole top electrode is in top electrode base 7, top electrode central electrode 4 is pressed on the semiconduction pad 8, the annulus that top electrode pressure ring 6 is pushed down middle part, top electrode metal shell 3 faces of cylinder is threaded with top electrode base 7, by tightening 6 pairs of top electrode pressurizations of top electrode pressure ring, with top electrode central electrode 4, semiconduction pad 8 and sample 9 compress with the bottom electrode plane;
The high-voltage output end of high-voltage DC power supply 31 is connected with high pressure BNC socket 1, the Y input end of oscillograph 27 is connected with charge signal SMA coax plug 17, the input end of electrometer 28 is connected with charge signal SMA coax plug 17, the high voltage narrow pulse output terminal of impulse source 29 is connected with pulse input SMA coax plug 24, the synchronous output end of impulse source 29 is connected with the synchronous input end of oscillograph 27, and the data output end of oscillograph 27 and electrometer 28 is connected with the data input pin of computing machine 30.
Ion sputtering instrument vacuum metallizing film is all used on the last lower plane of the organic glass post 15 of described metal-coated membrane and the face of cylinder.
Mirror polish is carried out on formation bottom electrode plane, the upper surface of ring 11 and bottom electrode outer shroud 12 in described electrode centers post 13, the bottom electrode.
The Standard resistance range of described current-limiting resistance 25 is 1.0～3.0M Ω.
The material of ring electrode 11, bottom electrode outer ring electrode 12 and bottom electrode newel electrode 13 is an aluminium in described top electrode central electrode 4, the bottom electrode.
The material of described top electrode metal shell 3, space charge collector metal shell 19 and bottom electrode metal shell 20 is an aluminium.
The material of described bottom electrode dividing plate 10 is a teflon sheet material.
The material of described bottom electrode newel insulation sleeve 18 is a teflon.
The material of described top electrode pressure ring 6 and top electrode base 7 is a brass.
Described semiconduction pad 8 is common semiconductive material, prevents that mainly sound wave from reflecting at the interface.
The course of work of the present invention is: the utmost point applies high-voltage dc to sample from power on, make and produce space charge in the sample, apply high voltage narrow pulse from bottom electrode to the sample center simultaneously, make the space charge of sample core that microvibration take place in the part under pulse action, the bottom electrode newel electrode of ground connection is passed in this vibration with the form of sound wave, be converted into electric signal by the piezoelectric sensor that is close to bottom electrode newel electrode top, amplify through the charge signal prime amplifier again, read the space charge signal waveform with oscillograph, this waveform is exactly the clear space CHARGE DISTRIBUTION along thickness direction of one dimension.Flow through the conduction current of sample by the electrometer measurement that is connected with ring electrode in the bottom electrode.The waveform that electrometer and oscillograph are read is read and write computing machine by the GPIB capture card, and computing machine carries out analyzing and processing with the signal that is collected.
High direct voltage is added on the sample that resistance is the hundreds of megaohm order of magnitude, and bottom electrode is an earth potential with respect to high direct voltage.In the pulse input circuit, be coupled on the sample of ring electrode correspondence in the bottom electrode in order to prevent pulse, ring electrode is the current-limiting resistance of megaohm two-stage with inserting resistance before electrometer links to each other in bottom electrode, for narrow pulse signal, the filter resistance of the megaohm order of magnitude is equivalent to open circuit, pulse can be coupled to the sample part of ring electrode correspondence in the bottom electrode, guarantees that pulse is added in the sample part that bottom electrode newel electrode pair is answered by coupling.In the sample loop of the interior ring electrode of bottom electrode, current-limiting resistance is a path for dc high-voltage source, high direct voltage all is added on the sample, be that ring electrode passes through electrometer ground connection in the bottom electrode, the sample of the interior ring electrode correspondence of bottom electrode is consistent with the distribution of space charge of the sample that the bottom electrode newel electrode pair of equivalent ground connection is answered, because with these two parts of a slice sample all is to be added between the bottom electrode of the top electrode of high pressure and ground connection, the space charge that sample produces under the high-voltage electric field effect is uniform in this two parts zone.Therefore, recording bottom electrode newel electrode pair, to answer the distribution of space charge of sample be exactly the distribution of space charge of the corresponding sample of ring electrode in the bottom electrode.
The present invention takes following measure, realizes that the conduction current and the space charge of sample tested simultaneously:
1.PEA method is when adding high direct voltage, the surface current of sample is easy to surpass the input bias current of electrometer, in order to get rid of surface current and to reduce contact noise, needs one three electrode measurement structure of design.The three-electrode system of bottom electrode of the present invention, select the accept base of bottom electrode dividing plate 10 as bottom electrode, the upper surface that has guaranteed bottom electrode outer ring electrode 12, the interior ring electrode 11 of bottom electrode and bottom electrode newel electrode 13 is in same plane, and the three realizes input pulse respectively, gathers the function of space charge PEA signal and collection conductive electrical current signal.Pulse is added on the bottom electrode outer ring electrode 12, and the equivalent resistance of pulse when input impulse source 29 is very little, is equivalent to DC earthing, so bottom electrode outer ring electrode 12 serves as guard electrode, the surface current that makes sample 9 just by this guard electrode directly into ground.Eliminated of the influence of the surface current of sample to electrometer measurement sample conduction current.
2. space charge PEA signal picker adopts organic glass post 15, bottom electrode newel insulation sleeve 18 and space charge collector metal shell 19 five-layer structures of bottom electrode newel electrode 13, piezoelectric sensor 14, metal-coated membrane, closely cooperate layer by layer, also transmit the piezoelectric signal of piezoelectric sensors 14 with the organic glass post 15 of metal-coated membrane, guarantee that sound wave does not cause reflection, accurately the measurement space charge signal.
3. adopt the multiple shield design.Top electrode metal shell 3, bottom electrode metal shell 20 and space charge collector metal shell 19 be ground connection all, and the transmission line of current signal adopts shielded cable simultaneously.The coaxial sleeve of also using ground connection of current-limiting resistance 25 coats, and makes each link of current delivery all have the screen layer of ground connection to protect.
4. the high pressure BNC socket 1 of top electrode, top electrode metal shell 3 and top electrode central electrode 4 usefulness epoxy resin 5 are poured into a mould fixingly, guarantee that top electrode is an integral body, and the dielectric strength of epoxy resin can improve the voltage that is added on the sample than higher simultaneously.Fixedly the top electrode pressure ring 6 of top electrode and top electrode base 7 cooperate for helicitic texture, and the sample 9 that guarantees to be added between top electrode and the bottom electrode is stressed even.
Beneficial effect of the present invention is, because of bottom electrode adopts three-electrode structure, high direct voltage and high voltage narrow pulse are introduced from the electrode of sample both sides respectively, both avoided the coupling of high direct voltage and pulse, eliminated the influence of the surface current of sample again, solve the not problem of energy measurement conduction current of electroacoustic pulse (PEA) method, realized that the conduction current of sample and space charge test simultaneously, be specially adapted to the electrical insulating material field.
Description of drawings
Fig. 1 is for surveying the PEA space charge proving installation electrode structure synoptic diagram of conduction current;
Fig. 2 is a space charge signal picker structural representation;
Fig. 3 is for surveying the PEA space charge proving installation synoptic diagram of conduction current.
Among the figure, 1--high pressure BNC socket, 2--electro-insulating rubber circle, 3--top electrode metal shell, 4--top electrode central electrode, 5--epoxy resin, 6--top electrode pressure ring, 7--top electrode base, 8--semiconduction pad, the 9--sample, ring electrode in the 10--bottom electrode dividing plate, 11--bottom electrode, 12--bottom electrode outer ring electrode, 13--bottom electrode newel electrode, 14--piezoelectric sensor, the organic glass post of 15--metal-coated membrane, 16--charge signal SMA coaxial socket, 17--charge signal SMA coax plug, 18--bottom electrode newel insulation sleeve, 19--space charge collector metal shell, 20--bottom electrode metal shell, the coaxial bend cutting seat of 21--current signal SMA, 22--current signal SMA coax plug, the coaxial bend cutting seat of 23--pulse input SMA, 24--pulse input SMA coax plug, the 25--current-limiting resistance, 26--charge signal prime amplifier, 27--oscillograph, the 28--electrometer, the 29--impulse source, 30--computing machine, 31--high-voltage DC power supply.
Embodiment
The present invention is described further by the following examples.Fig. 1 is the electrode structure synoptic diagram of embodiment, is made up of five parts, i.e. top electrode, bottom electrode, space charge acquisition channel, current signal acquisition channel and pulse input channel.
High pressure BNC socket 1 is enclosed within the center pit that is fixed in columniform top electrode metal shell 3 in the electro-insulating rubber circle 2, top electrode central electrode 4 places in the top electrode metal shell 3, the lower surface of top electrode central electrode 4 and top electrode metal shell 3 lower surfaces are in same plane, the upper surface of top electrode central electrode 4 is connected with bare conductor with the inner wire of high pressure BNC socket 1, epoxy resin 5 is cast in top electrode metal shell 3 inside, top electrode metal shell 3 and top electrode central electrode 4 fixing integrant removable top electrodes.Top electrode base 7 and bottom electrode newel electrode 13 coaxial bottom electrode dividing plate 10 upper surfaces that are fixed in.
In the pulse input channel, the coaxial bend cutting seat 23 of pulse input SMA is fixed in the lower surface of bottom electrode dividing plate 10, the inner wire of the coaxial bend cutting seat 23 of pulse input SMA is connected with bottom electrode outer ring electrode 12, and pulse input SMA coax plug 24 is fixed in bottom electrode metal shell 20 right side walls and is connected with the coaxial bend cutting seat 23 usefulness bare conductors of pulse input SMA.
In the current signal acquisition channel, the coaxial bend cutting seat 21 of current signal SMA is fixed in the lower surface of bottom electrode dividing plate 10, the inner wire of the coaxial bend cutting seat 21 of current signal SMA is connected with ring electrode 11 in the bottom electrode, place current-limiting resistance 25 1 ends in the bottom electrode metal shell 20 to be connected with the inner wire of the coaxial bend cutting seat 21 of current signal SMA, the other end is connected with the current signal SMA coax plug 22 that is fixed in bottom electrode metal shell 20 left side walls.
As shown in Figure 2, in the space charge acquisition channel, piezoelectric sensor 14 places under bottom electrode newel 13 lower surfaces, the organic glass post 15 of metal-coated membrane places under the piezoelectric sensor 14, bottom electrode newel insulation sleeve 18 coats bottom electrode newel 13 bottoms, the organic glass post 15 of piezoelectric sensor 14 and metal-coated membrane places in the space charge collector metal shell 19, space charge collector metal shell 19 is fixed in the lower surface of bottom electrode dividing plate 10 with piezoelectric sensor 14, the organic glass post 15 of metal-coated membrane and bottom electrode newel insulation sleeve 18 compress with bottom electrode newel 13 lower surfaces, charge signal SMA coaxial socket 16 is fixed in space charge collector metal shell 19 center holes, the golden film that the inner wire of charge signal SMA coaxial socket 16 passes organic glass post 15 lower surfaces of bottom electrode newel insulation sleeve 18 and metal-coated membrane reliably electrically contacts, and constitutes the space charge signal picker.Charge signal prime amplifier 26 places in the bottom electrode metal shell 20, and input end is connected with charge signal SMA coaxial socket 16, and output terminal is connected with the charge signal SMA coax plug 17 that is fixed in bottom electrode metal shell 20 left side walls.
When measuring sample, sample 9 places on the bottom electrode plane, semiconduction pad 8 is mixed poly semiconductive material film for graphite and is placed on the sample 9, whole top electrode is in top electrode base 7, top electrode central electrode 4 is pressed on the semiconduction pad 8, the annulus that top electrode pressure ring 6 is pushed down middle part, top electrode metal shell 3 faces of cylinder is threaded with top electrode base 7, by tightening 6 pairs of top electrode plus-pressures of top electrode pressure ring, top electrode central electrode 4, semiconduction pad 8 and sample 9 are compressed with the bottom electrode plane; As shown in Figure 3, the high-voltage output end of high-voltage DC power supply 31 is connected with high pressure BNC socket 1, the Y input end of oscillograph 27 is connected with charge signal SMA coax plug 17, the input end of electrometer 28 is connected with charge signal SMA coax plug 17, the high voltage narrow pulse output terminal of impulse source 29 is connected with pulse input SMA coax plug 24, the synchronous output end of impulse source 29 is connected with the synchronous input end of oscillograph 27, and the data output end of oscillograph 27 and electrometer 28 is connected with the data input pin of computing machine 31.High voltage narrow pulse is input to ring electrode 11 in the bottom electrode by pulse input SMA coax plug 24, is carried on the sample 9, and high direct voltage is input to top electrode central electrode 4 from high pressure BNC socket 1, is carried in sample 9.Import required high direct voltage of sample and high voltage narrow pulse during experiment simultaneously, high pressure makes and produces space charge in the sample, high voltage narrow pulse makes the charge generation vibration form acoustic signals, acoustic signals converts voltage signal to by piezoelectric sensor 14 and passes in the oscillograph 27, also have little electric current to flow through in the sample simultaneously, this little electric current is conduction current and is gathered by electrometer 28, gathers when having realized space charge and electric current.
In the device, the resistance of current-limiting resistance 25 is 1.5M Ω, top electrode central electrode 4, ring electrode 11 in the bottom electrode, the material of bottom electrode outer ring electrode 12 and bottom electrode newel electrode 13 is an aluminium, top electrode metal shell 3, the material of space charge collector metal shell 19 and bottom electrode metal shell 20 is an aluminium, the material of top electrode pressure ring 6 and top electrode base 7 is a brass, the material of bottom electrode dividing plate 10 is a teflon sheet material, the material of bottom electrode newel insulation sleeve 18 is a teflon, and ion sputtering instrument vacuum metallizing film is all used on the last lower plane of the organic glass post 15 of metal-coated membrane and the face of cylinder.Piezoelectric sensor 14 is the PVDF piezoelectric sensor, and thickness is 9 μ m, the surface electrode of aluminizing.The waveform that electrometer and oscillograph are read is read and write computing machine by the GPIB capture card, by computing machine the signal that is collected is carried out analyzing and processing at last.
The manufacture craft of this device requires:
1. need be when top electrode is poured into a mould to the heart.Utilization to the accessory of the heart realize the top electrode metal shell center and the top electrode central electrode center of circle to the heart.Simultaneously produce bubble in the process, adopt the method for layer-by-layer casting, promptly pour into a mould this one deck such as one deck and solidified again fully and pour into a mould in order to prevent.
2. mirror polish will be carried out in the formation bottom electrode plane, upper surface of ring and bottom electrode outer shroud in electrode centers post, the bottom electrode, and the bottom electrode newel electrode surface that bottom electrode is installed piezoelectric sensor need carry out mirror polish, otherwise influences measurement effect.
The three-electrode system of bottom electrode be by three independently ring texture realize that processing dimension can not have error, and at last with the assembling of interference fit technology.
4. the lead-in wire of current acquisition circuit adopts shielding line.
This device is mainly used in sheet or film like material is carried out the research of space charge characteristic.During use, take off top electrode, with surface, semiconduction pad and the lower electrode surface wiped clean of alcohol with top electrode; Lower electrode surface is coated silicone oil, and sample is placed on lower electrode surface, and guaranteeing does not have air to enter between sample and the bottom electrode; Upper electrode surface is coated silicone oil, and the semiconduction pad is close to upper electrode surface; A little silicone oil is dripped in sample upper surface center, puts top electrode well, tightens the top electrode pressure ring, prepares test.After the sample installation is ready, connect the circuit of each parts, opening power applies required high direct voltage to sample, again to applying high voltage narrow pulse on the sample, begins to carry out the collection of current signal and space charge signal.
The high direct voltage scope that present embodiment is suitable for is: 0～50KV; The parameter area of high voltage narrow pulse is: pulse height: 400～600V, pulse width: several ns～tens ns, repetition frequency: 50～400Hz.
Claims (10)
1. the PEA space charge proving installation that can survey conduction current, it is characterized in that, bottom electrode dividing plate (10) is the insulcrete of rectangle, the bottom electrode newel (13) of truncated cone is bottom-up to be fixed in the circular hole at bottom electrode dividing plate (10) middle part, ring (11) and bottom electrode outer shroud (12) are embedded in the bottom electrode dividing plate (10) with bottom electrode newel (13) is coaxial in the bottom electrode, bottom electrode newel (13), the ring (11) and the upper surface of bottom electrode outer shroud (12) and the upper surface of bottom electrode dividing plate (10) constitute the bottom electrode plane in the bottom electrode in same plane, piezoelectric sensor (14) places under bottom electrode newel (13) lower surface, the organic glass post (15) of gold-plated film places under the piezoelectric sensor (14), bottom electrode newel insulation sleeve (18) coats bottom electrode newel (13) bottom, the organic glass post (15) of piezoelectric sensor (14) and gold-plated film places in the space charge collector metal shell (19), space charge collector metal shell (19) is fixed in the lower surface of bottom electrode dividing plate (10) with piezoelectric sensor (14), the organic glass post (15) of gold-plated film and bottom electrode newel insulation sleeve (18) compress with bottom electrode newel (13) lower surface, the bottom electrode metal shell (20) of rectangular parallelepiped is fixed in the lower surface of bottom electrode dividing plate (10), charge signal SMA coaxial socket (16) is fixed in space charge collector metal shell (19) center hole, the golden film that the inner wire of charge signal SMA coaxial socket (16) passes organic glass post (15) lower surface of bottom electrode newel insulation sleeve (18) and gold-plated film reliably electrically contacts, charge signal prime amplifier (26) places in the bottom electrode metal shell (20), charge signal prime amplifier (26) input end is connected with charge signal SMA coaxial socket (16), output terminal is connected with the charge signal SMA coax plug (17) that is fixed in bottom electrode metal shell (20) left side wall, the coaxial bend cutting seat of current signal SMA (21) is fixed in the lower surface of bottom electrode dividing plate (10), the inner wire of the coaxial bend cutting seat of current signal SMA (21) is connected with ring (11) in the bottom electrode, place current-limiting resistance (25) one ends in the bottom electrode metal shell (20) to be connected with the inner wire of the coaxial bend cutting seat of current signal SMA (21), the other end is connected with the current signal SMA coax plug (22) that is fixed in bottom electrode metal shell (20) left side wall, the pulse input coaxial bend cutting seat of SMA (23) is fixed in the lower surface of bottom electrode dividing plate (10), the inner wire of the pulse input coaxial bend cutting seat of SMA (23) is connected with bottom electrode outer shroud (12), and pulse input SMA coax plug (24) is fixed in bottom electrode metal shell (20) right side wall and is connected with bare conductor with the pulse input coaxial bend cutting seat of SMA (23);
High pressure BNC socket (1) is enclosed within the center pit that is fixed in columniform top electrode metal shell (3) in the electro-insulating rubber circle (2), top electrode central electrode (4) places in the top electrode metal shell (3), the lower surface of top electrode central electrode (4) and top electrode metal shell (3) lower surface are in same plane, the upper surface of top electrode central electrode (4) is connected with bare conductor with the inner wire of high pressure BNC socket (1), epoxy resin (5) is cast in top electrode metal shell (3) inside, the fixing integrant removable top electrode of top electrode metal shell (3) and top electrode central electrode (4), top electrode base (7) and coaxial bottom electrode dividing plate (10) upper surface that is fixed in of bottom electrode newel (13), sample (9) places on the bottom electrode plane, semiconduction pad (8) places on the sample (9), whole top electrode is in top electrode base (7), top electrode central electrode (4) is pressed on the semiconduction pad (8), the annulus that top electrode pressure ring (6) is pushed down middle part, top electrode metal shell (3) face of cylinder is threaded with top electrode base (7), tighten top electrode pressure ring (6) to the top electrode pressurization, with top electrode central electrode (4), semiconduction pad (8) and sample (9) compress with the bottom electrode plane;
The high-voltage output end of high-voltage DC power supply (31) is connected with high pressure BNC socket (1), the Y input end of oscillograph (27) is connected with charge signal SMA coax plug (17), the input end of electrometer (28) is connected with charge signal SMA coax plug (17), the high voltage narrow pulse output terminal of impulse source (29) is connected with pulse input SMA coax plug (24), the synchronous output end of impulse source (29) is connected with the synchronous input end of oscillograph (27), and the data output end of oscillograph (27) and electrometer (28) is connected with the data input pin of computing machine (30).
2. a kind of PEA space charge proving installation of surveying conduction current according to claim 1 is characterized in that ion sputtering instrument vacuum metallizing film is all used on the last lower plane and the face of cylinder of the organic glass post (15) of described gold-plated film.
3. a kind of PEA space charge proving installation of surveying conduction current according to claim 1, it is characterized in that ring (11), bottom electrode outer shroud (12) and bottom electrode newel (13) utilize the interference fit technology to be fixed on the bottom electrode dividing plate (10) in the described bottom electrode.
4. a kind of PEA space charge proving installation of surveying conduction current according to claim 1, it is characterized in that mirror polish is carried out on formation bottom electrode plane, the upper surface of ring (11) and bottom electrode outer shroud (12) in described bottom electrode newel (13), the bottom electrode.
5. a kind of PEA space charge proving installation of surveying conduction current according to claim 1 is characterized in that the Standard resistance range of described current-limiting resistance (25) is 1.0～3.0M Ω.
6. a kind of PEA space charge proving installation of surveying conduction current according to claim 1 is characterized in that, the material of ring (11), bottom electrode outer shroud (12) and bottom electrode newel (13) is an aluminium in described top electrode central electrode (4), the bottom electrode.
7. a kind of PEA space charge proving installation of surveying conduction current according to claim 1 is characterized in that the material of described top electrode metal shell (3), space charge collector metal shell (19) and bottom electrode metal shell (20) is an aluminium.
8. a kind of PEA space charge proving installation of surveying conduction current according to claim 1 is characterized in that the material of described bottom electrode dividing plate (10) is a teflon sheet material.
9. a kind of PEA space charge proving installation of surveying conduction current according to claim 1 is characterized in that the material of described bottom electrode newel insulation sleeve (18) is a teflon.
10. a kind of PEA space charge proving installation of surveying conduction current according to claim 1 is characterized in that the material of described top electrode pressure ring (6) and top electrode base (7) is a brass.
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| CN101907659B (en) * | 2010-06-25 | 2013-03-20 | 华北电力大学 | Temperature controllable PEA space charge test device |
| CN102411095B (en) * | 2011-08-10 | 2013-10-16 | 中国科学院空间科学与应用研究中心 | Active static electric field probe |
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