CN108089068A - Compound slab sample three dimensions charge detecting device based on pulse electroacoustic method - Google Patents
Compound slab sample three dimensions charge detecting device based on pulse electroacoustic method Download PDFInfo
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- CN108089068A CN108089068A CN201711296022.7A CN201711296022A CN108089068A CN 108089068 A CN108089068 A CN 108089068A CN 201711296022 A CN201711296022 A CN 201711296022A CN 108089068 A CN108089068 A CN 108089068A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R29/24—Arrangements for measuring quantities of charge
Abstract
The invention discloses a kind of compound slab sample three dimensions charge detecting devices based on pulse electroacoustic method, include top electrode and lower electrode, aluminium electrode is provided in top electrode, two-layer compound tablet dielectric sample is set between aluminium electrode and lower electrode, the interlayer of two-layer compound tablet dielectric sample is provided with pin electrode and plate electrode, it is provided with to absorb the absorbed layer of sound wave in lower electrode, piezoelectric transducer is provided on absorbed layer, piezoelectric transducer is connected with amplifier, amplifier by A D converters be connected with computer.Apparatus of the present invention have successfully reproduced the accumulation, dissipation and migration characteristic of the space charge in compound slab sample under orthogonal non-uniform electric field, more electric field environment of the real simulation sample under real operating mode, take full advantage of greater number of piezoelectric membrane and so that all piezoelectric membranes are close to the lower surface of lower electrode, the existing limitation that can only measure the one-dimensional space distribution of charges under uniform electric field is breached, improves space charge measurement result reliability.
Description
Technical field
The invention belongs to distribution of space charge field of measuring technique in composite insulating material, and in particular to one kind is based on electroacoustic
The compound slab sample three dimensions charge detecting device of impulse method.
Background technology
Pulse electroacoustic method is one of wider method of the current application of measurement space distribution of charges both at home and abroad.By injecting high pressure
DC electric field and nanosecond pulse can obtain insulating materials Space-charge behavior via the Deconvolution calculation of amplifier and later stage.
This method has been used successfully to the space charge measurement of insulating materials under coaxial electrode and plate electrode at present.
The prior art describes a kind of detachable electroacoustic pulse interval charge detecting device, and the device is by DC high-voltage
Source, millimicrosecond pulse generator, upper/lower electrode, the terraced electrode unit of temperature, signal gathering unit, oscillograph and computer are formed.It can only
Apply voltage between upper/lower electrode, the electric field of interface direction (vertical with vertical direction) can not be applied to it, can only study absolutely
Space charge behavior of the edge material under uniform electric field can not study under orthogonal electric field space charge in compound slab sample
Injection, accumulation and dissipation behavior.And single piezoelectric transducer can be only installed, for compound slab sample space charge measurement area
Domain is limited, can not realize the three dimensions charge measurement for compound slab sample.
The content of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that it provides a kind of based on electroacoustic
The compound slab sample three dimensions charge detecting device of impulse method can measure the compound slab under orthogonal non-uniform electric field and try
Three dimensions charge transport process in sample solves the one-dimensional space charge point that can only be measured in the prior art under uniform electric field
Cloth.
The present invention uses following technical scheme：
Compound slab sample three dimensions charge detecting device based on pulse electroacoustic method, includes top electrode and lower electrode, on
Aluminium electrode is provided in electrode, two-layer compound tablet dielectric sample, two-layer compound are provided between aluminium electrode and lower electrode
The interlayer of tablet dielectric sample is provided with pin electrode and plate electrode, is provided with to absorb the absorbed layer of sound wave in lower electrode,
Piezoelectric transducer is provided on absorbed layer, piezoelectric transducer is connected with amplifier, and amplifier is by being arranged on lower electrode exterior
A D converters be connected with computer.
Specifically, top electrode includes the internal housing for being filled with epoxy resin, aluminium electrode is arranged in housing, and one end is stretched out
It is connected with two-layer compound tablet dielectric sample, the junction of external part and two-layer compound tablet dielectric sample, which is provided with, partly leads
Electric layer.
Further, aluminium electrode divides two-way, is connected all the way by current-limiting resistance with high voltage direct current generator, high direct voltage hair
It is connected between raw device and current-limiting resistance by high-voltage cable；Aluminium electrode another way connects by coupled capacitor and impulse generator
It connects.
Further, impulse generator is also connected with a DC high-voltage power supply, and coupled capacitor also passes through build-out resistor and shell
Body connects.
Specifically, lower electrode includes lower electrode shell, lower electrode shell is connected by screw rod and the housing of top electrode, is absorbed
Layer is arranged in lower electrode shell at two-layer compound tablet dielectric sample, and absorbed layer is provided outside shielding case.
Further, the upper surface of absorbed layer, side and lower surface are both provided with the aluminium foil of strip structure, piezoelectric membrane
The upper surface of absorbed layer is placed on, by aluminium foil by the electric signal transmission that piezoelectric membrane gathers to the recess of absorbed layer lower surface
Place, recess are provided with metal derby, and metal derby connects amplifier by shielding line.
Further, piezoelectric transducer includes multiple piezoelectric membranes, and each piezoelectric membrane passes through a shielded pair respectively
An amplifier should be connected.
Further, for piezoelectric membrane in 5 × 5 arrangements, the size of each piezoelectric membrane is 3.5mm × 3mm.
Further, with the center of the aluminium electrode in top electrode on same vertical curve, shielding case is circle at shielding case center
Shape structure, a diameter of 36~40mm.
Specifically, pin electrode is cut into tip-like for aluminium foil, powered on along the outside of two-layer compound tablet dielectric sample is same
Extremely it is connected；Plate electrode cuts out rectangular in form for aluminium foil, is clipped between two-layer compound tablet dielectric sample, is connected with lower electrode,
Pin electrode and plate electrode are located at the intermediate interface of two-layer compound tablet dielectric sample, the cell distance of pin electrode and plate electrode
For 25~28mm.
Compared with prior art, the present invention at least has the advantages that：
A kind of compound slab sample three dimensions charge detecting device based on pulse electroacoustic method disclosed by the invention, upper
Two-layer compound tablet dielectric sample between electrode and lower electrode is set, pin electricity is introduced in two-layer compound tablet dielectric sample
Pole and plate electrode apply positive pressure at pin electrode, are grounded at plate electrode, so as to which more real simulation sample is under real operating mode
Electric field environment, realize under orthogonal non-uniform electric field in compound slab sample the accumulation of space charge, dissipation and migration research.
Lower electrode is arranged with absorbed layer, and the acoustic impedance of absorbed layer is identical with piezoelectric transducer, so as to avoid sound wave in interface
Reflection to measuring signal generate interference.Piezoelectric transducer is provided on absorbed layer, piezoelectric transducer is connected with amplifier, puts
Big device amplifies faint signal, so as to by A D converters convert, A D converters be connected with computer, by analog signal
Digital signal is converted into, so as to be identified, receive by computer.Computer by digital signal handled, analyzed, counted
It calculates, is finally reduced into the waveform of two-layer compound tablet dielectric sample internal space-charge.
Further, powering on filling epoxy resin in pole housing ensures mutually insulated between device, and aluminium electrode is by partly leading
Electric layer plays balanced electric field with the connection of two-layer compound tablet dielectric sample, and aluminium electrode connection coupled capacitor can be to avoid height
Pressure, which acts directly on, damages pulse in pulse, and passes through build-out resistor and connect to be grounded with housing.
Further, lower electrode shell is connected by screw rod with powering on pole housing, so as to fixed top electrode and lower electrode, is made
Between two-layer compound tablet dielectric sample is compacted between the upper and lower electrodes, absorbed layer is arranged on the in vivo circle of lower electrode shell
In shape shielding case, measurement accuracy is effectively improved, the weight of top electrode causes the two-layer compound tablet dielectric between upper/lower electrode
Air at sample interface squeezes out so that dual-layer specimens more fit closely, and improve space charge measurement result reliability.In addition,
Piezoelectric transducer and absorbed layer are built in shielding case, can effectively the outer irrelevant signal of shielding case to by acoustical signal through piezoelectric membrane
The interference of electric signal is converted into, further improves space charge measurement result precision.
Further, the upper surface of absorbed layer, side and lower surface are both provided with the aluminium foil of strip structure, piezoelectric membrane
The upper surface of absorbed layer is placed on, by aluminium foil by the electric signal transmission that piezoelectric membrane gathers to the recess of absorbed layer lower surface
Place, recess are provided with metal derby, and metal derby connects amplifier by shielding line, which effectively realizes the array in shielding case
Arrangement piezoelectric membrane, adds space charge measurement dimension.In addition, the structure by designing absorbed layer, not only so that small pressure
Conductive film is successfully connected with shielding line, is also retained the function that absorbed layer itself realizes acoustic impedance match effect, is avoided pressure
Ripple by after piezoelectric membrane since acoustic impedance mismatches influence to output waveform.
Further, the sound for conducting metal block and 5 × 5 array piezoelectric film nestings is devised using 3D printing technique
Ripple absorbent layer structure realizes 25 piezoelectric membranes and is successfully mounted in the shielding case at the lower surface of lower electrode, compared to
Toward space charge measurement device can only measure it is one-dimensional under space charge, which realizes for compound slab sample three
Dimension space charge measurement.
Further, shielding case center is located at aluminium electrode center on same vertical curve, it is therefore intended that when aluminium electrode acts on
When two-layer compound tablet dielectric sample, the dual-layer specimens that aluminium electrode is made outside use circumference can be because the gravity of top electrode
It slightly upwarps, the air of dual-layer specimens interface is caused to enter.And aluminium electrode makees the two-layer compound tablet dielectric sample of use,
It due to top electrode gravity, still keeps fitting closely, shielding case ensure that piezoelectricity is thin in shielding case in the underface of the part
Film surveys acoustical signal and comes from the two-layer compound tablet dielectric sample fitted closely, improves the reliability of measurement result.In addition,
Shielding case is conducive to place more piezoelectric membranes for circular configuration, and easy to process.
Further, pin electrode and plate electrode are located at two layers of compound slab sample intermediate interface, compound slab examination to be measured
Sample is located between the upper surface of the in vivo aluminium electrode of top electrode chamber and lower electrode, the distance of pin electrode and plate electrode for 25~
28mm, it is ensured that between the piezoelectric membrane institute measuring point in shielding case does not only exist in the upper/lower electrode of vertical direction, also in level side
To needle to board electrode between, ensure that institute's test specimens come from orthogonal electric field effect as a result, pin electrode and plate electrode use aluminium
Paper tinsel is made, and can effectively avoid the influence of pin electrode and plate electrode thickness to space charge in compound slab sample.
In conclusion apparatus of the present invention have successfully reproduced under orthogonal non-uniform electric field space charge in compound slab sample
Accumulation, dissipation and migration characteristic, more electric field environment of the real simulation sample under real operating mode.Meanwhile the present invention passes through 3D
Printing technique improves absorbent layer structure, so as to be sufficiently used greater number of piezoelectric membrane and so that all piezoelectricity are thin
Film is close to the lower surface of lower electrode, not only breaches the one-dimensional space electricity that can only be measured in the prior art under uniform electric field
The limitation of lotus distribution also improves the reliability of space charge measurement result.
Below by drawings and examples, technical scheme is described in further detail.
Description of the drawings
Fig. 1 is measuring device structure diagram of the present invention；
Fig. 2 is that the present invention is used to embed conducting metal block and 5 × 5 array piezoelectric films by what 3D printing technique designed
Wave absorption layer structure three-view diagram, wherein, (a) is front view, and (b) is left view, and (c) is bottom view；
Fig. 3 is needle plate electrode unit top view of the present invention.
Wherein：1. high voltage direct current generator；2. impulse generator；3. DC high-voltage power supply；4. high-voltage cable；5. first
Nut；6. epoxy resin；7. current-limiting resistance；8. screw rod；9. build-out resistor；10. aluminium electrode；11. coupled capacitor；12. the second spiral shell
It is female；13. lower electrode shell；14. pin electrode；15. semi-conductive layer；16. two-layer compound tablet dielectric sample；17. shielding line；
18. plate electrode；19. piezoelectric membrane；20. absorbed layer；21. shielding case；22. amplifier；23.A/D converters；24. computer.
Specific embodiment
In the description of the present invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or be integrally connected；It can
To be mechanical connection or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
Referring to Fig. 1, a kind of compound slab sample three dimensions charge detecting device based on pulse electroacoustic method of the present invention,
Including high voltage direct current generator 1, nanosecond high-voltage pulse generator 2, top electrode, lower electrode, pin electrode 14, plate electrode 18, pressure
Electric transducer, wave absorption layer 20, shielding case 21, A D converters 23, computer 24.
High voltage direct current generator 1 and high-voltage pulse generator 2 are connected respectively with top electrode, are set between top electrode and lower electrode
Two-layer compound tablet dielectric sample 16 is equipped with, pin electrode 14 and plate electrode are provided on two-layer compound tablet dielectric sample 16
18, piezoelectric transducer and sound wave absorbed layer 20 are arranged in the shielding case 21 in lower electrode, by amplifier 22 and are arranged on down
The computer 24 of electrode exterior connects, and A/D converter 23 is arranged between amplifier 22 and computer 24.
Top electrode includes powering on pole housing and top electrode cavity, and current-limiting resistance 7, coupled capacitor are equipped in top electrode cavity
11st, build-out resistor 9, aluminium electrode 10, and by pouring epoxy resin 6 in pole housing and ensuring between device mutually absolutely powering on
Edge.
Top electrode case top offers high tension voltage interface, and the high-voltage cable 4 of high voltage direct current generator 1 is by powering on
The high tension voltage interface opened up at the top of pole housing is stretched into top electrode cavity, and is passed through current-limiting resistance 7 and be connected with aluminium electrode 10,
High pressure is acted on top electrode by high voltage direct current generator 1 by high-voltage cable 4 and current-limiting resistance 7；
2 one end of impulse generator connects DC high-voltage power supply 3, and the other end is connect by the BNC that top electrode case top opens up
Head is stretched into top electrode cavity, and is passed through coupled capacitor 11 and be connected with aluminium electrode 10, the coupled electricity of pulse of impulse generator 2
Hold 11 injection top electrodes, coupled capacitor 11 can act directly on to avoid high pressure and pulse is damaged in pulse；
Impulse generator 2 is connected by build-out resistor 9 with the metal shell for powering on pole housing.
It powers on pole housing to be made of aluminium shell, including cylindrical drum and disk, the upper surface of lower electrode shell is equipped with two
Threaded hole, two threaded holes are connected respectively with screw rod 8, and two screw rods 8 are each passed through the through hole of top electrode both wings, and reinforce first
5 and second nut 12 of nut so as to fixed top electrode and lower electrode, is pressed in two-layer compound tablet dielectric sample 16
Between electrode and lower electrode.
The spacing distance of two threaded holes is 270mm.
Lower electrode includes lower electrode shell 13 and lower electrode chamber, and the inner surface of lower electrode shell 13 is consolidated by four threaded holes
A fixed circular shield shell 21,21 a diameter of 36mm of shielding case, 21 center of shielding case and the in vivo aluminium electrode 10 of top electrode chamber
Center is on same vertical curve.
Shielding case 21 is built-in with wave absorption layer 20 and piezoelectric membrane 19, and piezoelectric membrane 19 surveys electric signal via shielding line
17 are connected with the in vivo amplifier 22 of lower electrode cavity, electric signal by amplifier 22 amplification output after by A D converters 23 with
Computer 24 connects.
Referring to Fig. 2, absorbed layer 20 is designed using 3D printing technique, and in shielding case 21, shielding case 21 and suction
The lower surface that piezoelectric membrane 19 is fixed on lower electrode by layer 20 is received, piezoelectric membrane 19 is arranged in 5 × 5, each piezoelectric membrane 19
Size is 3.5mm × 3mm, each piezoelectric membrane 19 by amplifier 22 by A D converters 23 connect with computer 24
It connects.
The structure of absorbed layer 20 is as shown in Fig. 2, be attached to the upper surface, side, following table of absorbed layer 20 using strip aluminium foil
Face, piezoelectric membrane 19 are placed on the upper surface of absorbed layer 20, so that aluminium foil can be by electric signal from 20 upper surface of absorbed layer
Piezoelectric membrane 19 is transferred to 20 lower surface recess of absorbed layer；20 lower surface recess insertion metal derby of absorbed layer, metal derby with
Upper surface is in close contact with aluminium foil, and lower surface welding is used for the shielding line 17 of signal transmission.
It designs with this configuration, the electric signal that aluminium foil can be used to generate piezoelectric membrane 19 transmits downwards, and passes through screen
It covers line 17 and is transferred to amplifier 22.
Referring to Fig. 3, pin electrode 14 is cut into tip-like by aluminium foil, be clipped in two-layer compound tablet dielectric sample 16 it
Between, the outside along two-layer compound tablet dielectric sample 16 is connected with top electrode；
Plate electrode 18 cuts out rectangular in form by aluminium foil, is clipped between two-layer compound tablet dielectric sample 16, with lower electrode
It is connected.
Pin electrode 14 and plate electrode 18 are located at the intermediate interface of two-layer compound tablet dielectric sample 16,14 He of pin electrode
The spacing of plate electrode 18 is 25mm.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.The present invention being described and shown in usually here in attached drawing is real
Applying the component of example can be arranged and be designed by a variety of configurations.Therefore, the present invention to providing in the accompanying drawings below
The detailed description of embodiment be not intended to limit the scope of claimed invention, but be merely representative of the selected of the present invention
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, belongs to the scope of protection of the invention.
A kind of compound slab sample three dimensions charge detecting device based on pulse electroacoustic method of the present invention, first by pin electricity
Pole 14 and plate electrode 18 are clipped among two-layer compound tablet dielectric sample 16, are divided by two-layer compound tablet dielectric sample 16
It is not connected with top electrode and lower electrode, between two-layer compound tablet dielectric sample 16 and the upper surface of lower electrode uniformly applies
A small amount of silicone oil is smeared, comes into full contact with different interfaces, reduces reflection of the sound wave between different interfaces.
Semi-conductive layer 15 is placed in 16 top of two-layer compound tablet dielectric sample, and semi-conductive layer 15 is connected with aluminium electrode 10,
By tightening the first nut 5 and the second nut 12 two-layer compound tablet dielectric sample 16 is made to stablize between upper/lower electrode.
High pressure is applied to top electrode by high voltage direct current generator 1, impulse generator 2 is opened simultaneously, applies to top electrode
High-voltage nanosecond pulse.
Under the action of high-voltage nanosecond pulse, the space charge inside two-layer compound tablet dielectric sample 16 occurs small
Vibration, be transferred to electrode under aluminum in the form of a sound wave.
Acoustical signal is converted into electric signal by the piezoelectric membrane 19 for being close to lower electrode lower surface, and electric signal is put through amplifier 22
Greatly and digital data transmission is converted to computer 24 by A/D converter 23.
The digital signal collected is handled, analyzed, calculated by computer 24, is finally reduced into sample inner space electricity
The waveform of lotus.
More than content is merely illustrative of the invention's technical idea, it is impossible to protection scope of the present invention is limited with this, it is every to press
According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within claims of the present invention
Protection domain within.
Claims (10)
1. the compound slab sample three dimensions charge detecting device based on pulse electroacoustic method, which is characterized in that including top electrode
With lower electrode, aluminium electrode (10) is provided in top electrode, two-layer compound tablet is provided between aluminium electrode (10) and lower electrode
Dielectric sample (16), the interlayer of two-layer compound tablet dielectric sample (16) are provided with pin electrode (14) and plate electrode (18),
It is provided with to absorb the absorbed layer (20) of sound wave in lower electrode, absorbed layer is provided with piezoelectric transducer, piezoelectric sensing on (20)
Device is connected with amplifier (22), amplifier (22) through being arranged on lower electrode exterior A D converters (23) and computer (24)
Connection.
2. a kind of compound slab sample three dimensions charge measurement dress based on pulse electroacoustic method according to claim 1
It puts, which is characterized in that top electrode includes the internal housing for being filled with epoxy resin (6), and aluminium electrode (10) is arranged in housing, and one
End is stretched out to be connected with two-layer compound tablet dielectric sample (16), the company of external part and two-layer compound tablet dielectric sample (16)
The place of connecing is provided with semi-conductive layer (15).
3. a kind of compound slab sample three dimensions charge measurement dress based on pulse electroacoustic method according to claim 2
It puts, which is characterized in that aluminium electrode (10) divides two-way, is connected all the way by current-limiting resistance (7) with high voltage direct current generator (1), directly
It is connected between stream high pressure generator (1) and current-limiting resistance (7) by high-voltage cable (4)；Aluminium electrode (10) another way passes through coupling
Capacitance (11) is closed to be connected with impulse generator (2).
4. a kind of compound slab sample three dimensions charge measurement dress based on pulse electroacoustic method according to claim 3
It puts, which is characterized in that impulse generator (2) is also connected with a DC high-voltage power supply (3), and coupled capacitor (11) is also through overmatching electricity
Resistance (9) is connected with housing.
5. a kind of compound slab sample three dimensions charge measurement dress based on pulse electroacoustic method according to claim 1
It puts, which is characterized in that lower electrode includes lower electrode shell (13), and lower electrode shell (13) passes through screw rod (8) and the shell of top electrode
Body connects, and absorbed layer (20) is arranged in lower electrode shell (13) at two-layer compound tablet dielectric sample (16), absorbs
Layer (20) is provided outside shielding case (21).
6. a kind of compound slab sample three dimensions charge measurement dress based on pulse electroacoustic method according to claim 5
It puts, which is characterized in that upper surface, side and the lower surface of absorbed layer (20) are both provided with the aluminium foil of strip structure, and piezoelectricity is thin
Film (19) is placed on the upper surface of absorbed layer (20), by aluminium foil by the electric signal transmission that piezoelectric membrane (19) gathers to absorbed layer
(20) recess of lower surface, recess are provided with metal derby, and metal derby connects amplifier (22) by shielding line (17).
7. a kind of compound slab sample three dimensions charge measurement dress based on pulse electroacoustic method according to claim 6
It puts, which is characterized in that piezoelectric transducer includes multiple piezoelectric membranes (19), and each piezoelectric membrane (19) passes through a shielding respectively
Line (17) is correspondingly connected with an amplifier (22).
8. a kind of compound slab sample three dimensions charge measurement dress based on pulse electroacoustic method according to claim 7
It puts, which is characterized in that for piezoelectric membrane (19) in 5 × 5 arrangements, the size of each piezoelectric membrane (19) is 3.5mm × 3mm.
9. a kind of compound slab sample three dimensions charge measurement dress based on pulse electroacoustic method according to claim 5
It puts, which is characterized in that the center of the aluminium electrode (10) in shielding case (21) center and top electrode is on same vertical curve, shielding case
(21) it is circular configuration, a diameter of 36~40mm.
10. a kind of compound slab sample three dimensions charge measurement dress based on pulse electroacoustic method according to claim 1
It puts, which is characterized in that pin electrode (14) is cut into tip-like for aluminium foil, along the outside of two-layer compound tablet dielectric sample (16)
It is connected with top electrode；Plate electrode (18) cuts out rectangular in form for aluminium foil, is clipped between two-layer compound tablet dielectric sample (16),
It is connected with lower electrode, pin electrode (14) and plate electrode (18) are located at the intermediate interface of two-layer compound tablet dielectric sample (16)
The cell distance of place, pin electrode (14) and plate electrode (18) is 25~28mm.
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| CN108957158A (en) * | 2018-07-30 | 2018-12-07 | 上海交通大学 | More sample space charge simultaneous measuring apparatus and method based on pulse electroacoustic method |
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| CN113092886A (en) * | 2021-04-08 | 2021-07-09 | 华北电力大学 | Improved electroacoustic pulse method space charge distribution measuring platform based on photoelastic effect |
| CN113341288A (en) * | 2021-05-31 | 2021-09-03 | 上海电力大学 | Controllable pressure simulation device for electrical branch experiment of flat composite insulation sample interface |
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