CN108120906A - From trigger-type liquid electric discharge temporal-spatial evolution observation system under a kind of pulse voltage - Google Patents
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- CN108120906A CN108120906A CN201711386803.5A CN201711386803A CN108120906A CN 108120906 A CN108120906 A CN 108120906A CN 201711386803 A CN201711386803 A CN 201711386803A CN 108120906 A CN108120906 A CN 108120906A
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- 238000011161 development Methods 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 9
- 239000003822 epoxy resin Substances 0.000 claims description 4
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- 238000011160 research Methods 0.000 abstract description 7
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/16—Construction of testing vessels; Electrodes therefor
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses under a kind of pulse voltage from trigger-type liquid discharge temporal-spatial evolution observation system, including liquid discharge test device, multichannel sequential trigger signal generating means and light path reflection cavity；Liquid discharging tester includes experiment cavity, bushing, experimental electrode and electrode regulator, experiment cavity is provided with four sides observation window, it is distributed in cavity top surface, front and left and right side, the freely adjustable electrode of electrode regulator position in cavity；Multichannel sequential trigger signal generating means is high voltage power supply, optical observation apparatus provides multichannel sequential controllable trigger signal；The vertical direction optical signal that liquid electric discharge generates is turned to horizontal direction optical signal by light path reflection cavity；The present invention can carry out the schlieren shooting experiment of different liquids discharge channel under high voltage pulse and multi-angle optical shooting experiment, experiment porch is provided for the developmental research of different liquids discharge channel and three-dimensionalreconstruction, enriches the experimental observation means of liquid discharge passageway developing characteristics.
Description
Technical Field
The invention belongs to the technical field of research on discharge characteristics of liquid insulating materials, and particularly relates to a self-triggering liquid discharge spatio-temporal evolution observation system under pulse voltage.
Background
The liquid dielectric medium has good circulation fluidity and breakdown self-recovery capability, so that the liquid dielectric medium is widely applied to high-voltage power equipment such as power transformers, mutual inductors, sleeves and the like and pulse power devices such as pulse transformers, high-current pulse electron beam accelerators, high-energy X-ray sources and the like. In the power industry, the performance of a liquid insulating medium is an important condition for ensuring whether power equipment can normally and stably operate, once the dielectric performance of the liquid insulating medium is damaged, the electric equipment can be damaged, and serious economic loss and even casualties are caused. The research on the discharge characteristics of liquid dielectrics is a key problem for promoting the development of high-voltage equipment insulation technology.
The generation and development of liquid discharge are complex physical and chemical processes, and are often accompanied with phenomena such as luminescence, heating, sounding and the like, and products such as current pulse, ultrahigh frequency electromagnetic wave, ultrasonic wave, organic hydrocarbon gas and the like are generated, so that the liquid discharge has many influencing factors, and the difficulty is increased for exploring the discharge mechanism of the liquid discharge. At present, compared with the discharge mechanism in liquid and solid, the understanding level of the discharge mechanism of liquid dielectric medium is far delayed, and various complex phenomena in experiments are not reasonably explained by the discharge theory. Therefore, in order to study the liquid discharge characteristics, it is necessary to combine various detection means such as electricity and optics, and further improve the liquid discharge detection platform, and to capture the liquid discharge images at different times from multiple angles, so as to promote the depth of the liquid discharge development mechanism. Meanwhile, research on liquid discharge needs to be combined with engineering practice, and influences of different practical factors on liquid insulation performance, such as liquid dielectric medium types and electric field uniformity, are considered.
At present, scholars at home and abroad carry out a lot of researches on the discharge phenomenon and mechanism in the liquid dielectric medium, mainly use various operating environments of power equipment as backgrounds, and concentrate on the liquid discharge phenomenon under voltage excitation of direct current, power frequency, lightning impulse and the like, wherein most of optical detection on liquid discharge can only obtain a liquid discharge image at a certain fixed moment from a single angle, and the development path of a discharge channel during liquid discharge cannot be accurately described. At present, there is no research scheme for acquiring discharge images of liquid discharge at different times from multiple angles.
Disclosure of Invention
The invention aims to provide a self-triggering liquid discharge spatio-temporal evolution observation system under pulse voltage, which can acquire images of discharge development along with time in liquid from different angles and provide an experimental platform for researching the development mechanism of a liquid discharge channel.
The invention is realized by adopting the following technical scheme:
a self-triggering type liquid discharge space-time evolution observation system under pulse voltage comprises a liquid discharge test device, a light path reflection cavity, a high-voltage pulse power supply, a photomultiplier, an oscilloscope, a schlieren instrument, a light source and a multi-path time sequence trigger signal generation device; wherein,
the liquid discharge testing device comprises an experiment cavity, an experiment electrode and an electrode adjusting device, wherein the experiment cavity is provided with four observation ports which are distributed on the top surface, the front surface and two side surfaces of the cavity, the top of the experiment cavity is provided with a high-voltage sleeve, an oil charging port and an air inlet/outlet port, and the air inlet/outlet port is used for vacuumizing the experiment cavity; the experimental electrode comprises a ground electrode and a high-voltage electrode which are arranged in the experimental cavity, and the electrode adjusting device is arranged in the experimental cavity and used for changing the position of the ground electrode to adjust the distance and the relative position of the ground electrode and the high-voltage electrode; the ground electrode is connected with the shell of the experimental cavity, a discharge current leading-out terminal is arranged in the experimental cavity and is connected with the oscilloscope through the current sensor so as to obtain the current waveform of liquid discharge;
the optical path reflecting cavity is arranged at the top of the experimental cavity, an optical reflecting mirror is arranged in the optical path reflecting cavity, the optical reflecting mirror is connected with an observation mirror on the top surface of the experimental cavity and used for converting a vertical direction optical path generated by liquid discharge into a horizontal direction optical path, and an optical path outlet of the optical path reflecting cavity is connected with an optical observation camera through an observation port;
the photomultiplier is connected with an observation port in front of the experimental cavity, when a liquid discharge schlieren image is obtained, the schlieren instrument and the light source are connected with two observation ports on the side surface of the experimental cavity, and when a three-dimensional discharge image is obtained, two optical observation cameras are connected with two observation ports on the side surface of the experimental cavity;
two ends of the high-voltage pulse power supply are connected in parallel with a capacitive divider, and the output end of the high-voltage pulse power supply extends into the experimental cavity through a metal connecting rod arranged in the high-voltage sleeve and is connected with the high-voltage electrode; the capacitive voltage divider is grounded, and a voltage dividing terminal is connected with the oscilloscope to display the applied voltage waveform;
the multi-channel time sequence trigger signal generating device is used for providing multi-channel time sequence controllable trigger signals for the high-voltage pulse power supply, the optical observation camera, the schlieren instrument, the light source and the photomultiplier, and controlling the optical observation camera to shoot at a specified time to obtain a liquid discharge channel time-space evolution development image.
The invention has the further improvement that the top of the experiment cavity is provided with a barometer, the bottom of the experiment cavity is provided with an oil drain port, and the side surface of the experiment cavity is provided with a cavity door.
The invention further improves the structure of the experimental electrode in the forms of a pin-plate electrode, a ball-plate electrode and a plate-plate electrode.
The electrode adjusting device is further improved in that the electrode adjusting device comprises a slide rail and a telescopic rod structure which is arranged on the slide rail and can move along the slide rail, the telescopic rod structure is L-shaped, the ground electrode is arranged on the telescopic rod structure, the moving distance of the telescopic rod structure on the slide rail is adjusted within the range of 80-150mm, the distance between the ground electrode and the high-voltage electrode is adjusted through the telescopic rod structure, and the distance adjusting range is 0-50 mm.
The invention is further improved in that the air inlet/outlet is connected with a vacuum pump, and the experiment cavity is vacuumized by the vacuum pump.
The invention is further improved in that the whole experiment cavity has the tolerance gas pressure not less than 5 atm.
The invention is further improved in that the experimental cavity is a stainless steel closed cavity, and a layer of epoxy resin is coated on the inner wall of the cavity to increase the electrical insulation distance.
The invention is further improved in that a current limiting resistor is arranged on an output circuit after the high-voltage pulse power supply is connected with the capacitive voltage divider in parallel.
The invention has the further improvement that the high-voltage pulse power supply can output the standard lightning impulse voltage of 0-150 kV.
The invention has the following beneficial technical effects:
1. the experimental cavity is provided with four observation ports distributed on the top surface, the front surface and two side surfaces of the cavity, the photomultiplier is connected with the front side observation port, the optical intensity of liquid discharge can be obtained, the light path reflection cavity is arranged at the top of the experimental cavity and is connected with one optical camera, two observation ports on the side surface are respectively connected with the other two optical cameras, the device can realize multi-angle shooting of liquid discharge images to obtain three-dimensional images of the development of the liquid discharge channel, the two observation ports on the side surface can also be connected with the light source and the schlieren instrument to obtain schlieren images of the liquid discharge channel, the multi-path time sequence trigger signal generating device respectively provides time sequence trigger signals for the high-voltage pulse power supply, the optical observation cameras with different angles, the schlieren instrument light source and the photomultiplier, the development process of the liquid discharge channel along with the time evolution can be realized by accurately controlling the sequence of the trigger signals, and the liquid discharge three-dimensional observation and the space-time evolution process observation by using the method have higher research reference value.
2. The experimental cavity is provided with a cavity door and an electrode adjusting device, so that the free adjustment of the distance between the high voltage and the ground electrode can be realized, meanwhile, the electrodes can be arranged into a pin-plate electrode, a ball-plate electrode and a plate-plate electrode, and the influence of different electrode distances and electric field uniformity conditions on the liquid discharge development can be researched.
3. The top of the experiment cavity is provided with an air inlet/outlet which is connected with a vacuum pump, so that the experiment cavity can be vacuumized, and the influence of different pressure conditions on the liquid discharge development can be researched.
Drawings
FIG. 1 is a schematic diagram of the present invention for observing the multi-angle space-time evolution of liquid discharge under a pulse voltage.
FIG. 2 is a schematic diagram of the present invention for taking a liquid discharge schlieren under a pulse voltage.
FIG. 3 is a multi-trigger timing diagram for multi-angle space-time evolution observation of liquid discharge under pulse voltage.
FIG. 4 is a timing diagram of the multiple triggering for taking the streaked image of the liquid discharge under the pulse voltage according to the present invention.
In the figure: 1-an experimental cavity, 2-a high-voltage bushing, 3-a barometer, 4-an oil filling port, 5-an air inlet/outlet, 6-a high-voltage electrode, 7-a light path reflection cavity, 8-a ground electrode, 9-a slide rail, 10-a telescopic rod structure, 11-a cavity top surface, 12-a cavity front surface, 13-a cavity side surface, 14-a cavity door, 15-a multi-channel time sequence trigger signal generating device, 16-a high-voltage pulse power supply, 17-an optical observation camera, 18-a photomultiplier, 19-an optical reflector, 20-a current limiting resistor, 21-a capacitive voltage divider, 22-an oil outlet, 23-an oscilloscope, 24-a current sensor, 25-a schlieren instrument and 26-a light source.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1 and fig. 2, the invention provides a self-triggered liquid discharge spatial-temporal evolution observation system under pulse voltage, comprising a liquid discharge test device, a multi-path time sequence trigger signal generation device 15 and a light path reflection cavity 7.
Wherein, liquid discharge testing arrangement includes experiment cavity 1, high-tension bushing 2, experiment electrode and electrode adjusting device, it has four observation mirrors to inlay on the experiment cavity 1, distribute in cavity top surface 11, the preceding 12 of cavity and two cavity side 13, the experiment electrode comprises high voltage electrode 6 and ground electrode 8, electrode adjusting device changes the ground electrode position through slide rail 9 and telescopic link structure 10 and adjusts electrode interval and relative position, whole experiment cavity has good gas tightness, can tolerate atmospheric pressure and be not less than 5atm, the experiment cavity is provided with cavity door 14, oil charge mouth 4, oil drain port 22, air inlet/outlet 5, barometer 3, wherein air inlet/outlet and vacuum pump connection.
The multi-channel time sequence trigger signal generating device provides multi-channel time sequence controllable trigger signals for the high-voltage pulse power supply 16, the optical observation camera 17, the schlieren instrument 25, the light source 26 of the schlieren instrument and the photomultiplier 18, controls the optical detection instruments at different observation angles to shoot at specified time, obtains a liquid discharge channel space-time evolution development image, and provides an experimental platform for three-dimensional reconstruction of the discharge channel image.
An optical reflector 19 is arranged in the light path reflection cavity and connected with the observation mirror on the top surface of the cavity body, a vertical light path generated by liquid discharge is converted into a horizontal light path, and the light path outlet of the reflection cavity is connected with an optical observation camera.
Furthermore, the high-voltage bushing is cast by epoxy resin and can bear the highest 150kV power frequency voltage and 320kV lightning impulse voltage.
Furthermore, the experimental electrodes can be needle-plate electrodes, ball-plate electrodes and plate-plate electrodes, different electrodes can be selected according to requirements during experiments to be installed, the conditions of uneven electric field discharge, slightly uneven electric field discharge and even electric field discharge of electrodes in liquid are simulated respectively, the electrodes are made of stainless steel, and the ground electrodes are plate electrodes all the time.
Furthermore, the electrode adjusting device comprises a metal sliding rail and an L-shaped metal telescopic rod, the metal sliding rail is fixed at the bottom of the cavity in the middle, a sliding rail sliding block is connected with the metal telescopic rod through threads, the L-shaped metal telescopic rod is connected with a metal flat ground electrode through threads, the electrode distance can be adjusted through the telescopic rod, the distance adjusting range is 0-50mm, the movable guide rail sliding block can drive the electrode to move back and forth, and the distance adjusting range is 80-150 mm.
Further, the experiment cavity is provided with the four sides observation window, is located cavity top surface, preceding and two sides on left and right respectively, two observation window symmetry parallel distribution on left and right side, and top surface and preceding observation window horizontal position are the same with the side observation window, and the observation window has high mirror flatness, and the observation window setting is used for liquid discharge channel schlieren image to shoot or carries out optical signal intensity simultaneously and shoot with discharge channel optical image multi-angle.
Furthermore, the multi-channel time sequence trigger signal generating device provides multi-channel time sequence controllable trigger signals, the interval time precision of different channels of trigger signals is 0.1 mu s, when the liquid discharge channel is shot in multi-angle space-time evolution, the specific multi-channel trigger pulse time sequence is shown in a reference figure 3, the trigger device firstly sends out a starting signal to triggerA high voltage pulse source for generating a pulse voltage signal with a lapse time Δ t1After the time, discharge occurs in the liquid, the photomultiplier converts the received discharge light signal into an electric signal and transmits the electric signal to the trigger device, and the trigger device receives the electric signal and passes through the preset time delta t2、Δt3、Δt4Then respectively sending trigger signals to an optical camera a, an optical camera b and an optical camera c which are positioned at different angles to shoot discharge images.
Further, when the multi-channel timing trigger signal generating device performs schlieren shooting on the liquid discharge channel, the specific multi-channel trigger pulse timing is shown in fig. 4, the trigger device firstly sends out a start signal to trigger the schlieren instrument light source to send out parallel light, and the parallel light passes through delta t1Triggering a high-voltage pulse power supply after the light intensity of the light source is stable to generate a pulse voltage signal after the time is delta t2After the time, discharge occurs in the liquid, the photomultiplier converts the received discharge light signal into an electric signal and transmits the electric signal to the trigger device, and the trigger device receives the electric signal and passes through the preset time delta t3Sending a trigger signal to the schlieren instrument to shoot schlieren images of the discharge channel, and after the trigger device receives an electric signal of the photomultiplier tube, after a preset time delta t4And (5) turning off the light source of the schlieren instrument to finish the schlieren image shooting process of the liquid discharge channel.
Furthermore, the light path reflection cavity is L-shaped, an optical reflector is arranged inside the light path reflection cavity, one end of the reflection cavity is connected with the observation window at the top of the cavity through threads, the other end of the reflection cavity is connected with the optical observation camera, after liquid discharges, a discharge light signal enters the reflection cavity and perpendicularly enters the optical camera through the optical reflector, and the inner wall and the outer wall of the reflection cavity are coated with high-absorbance materials so as to reduce the influence of an external light source and other interference light sources on liquid discharge optical shooting.
Furthermore, the experiment cavity is a stainless steel sealed cavity, and a layer of epoxy resin is coated on the inner wall of the cavity, so that the discharge insulation distance is increased.
Furthermore, the test cavity is provided with a cavity door, and the cavity door can be opened to replace the electrodes and adjust the electrode distance before the cavity is filled with oil.
Furthermore, the pressure gauge, the oil filling port and the oil filling/exhausting port are located near the optical path reflection cavity at the upper part of the cavity, the oil taking/exhausting port is located at the lower part of the cavity, ball valves are arranged at all external connecting ports to ensure the air tightness of the cavity, the oil filling process in the cavity comprises the steps of firstly connecting a vacuum pump with an experimental cavity exhaust port, opening the exhaust port ball valve, pumping air in the cavity out, keeping the air pressure in the cavity at about 50pa, closing the exhaust port ball valve, connecting a cavity oil outlet and an oil inlet with an oil container through a rubber pipe, opening the oil inlet ball valve, and injecting vacuum drying transformer oil into the cavity through the oil inlet by utilizing the air.
Further, the high-voltage bushing is connected with a high-voltage pulse power supply, the output of the high-voltage pulse power supply is 0-150 kV standard lightning impulse voltage, the output end of the high-voltage pulse power supply is simultaneously connected with the upper end of a capacitive voltage divider 21 through a current-limiting resistor 20, the lower end of the capacitive voltage divider 21 is grounded, and a voltage dividing terminal is connected with an oscilloscope 23 to display applied voltage waveform.
Further, the cavity ground electrode is connected with the cavity metal shell, and the cavity is provided with a discharge current leading-out terminal which is connected with the current sensor 24 and the oscilloscope to obtain the current waveform of liquid discharge.
The above are merely preferred examples of the present invention, which should not be taken as limiting the scope of the invention, and therefore, the invention is not limited thereto.
Claims (9)
1. A self-triggering type liquid discharge space-time evolution observation system under pulse voltage is characterized by comprising a liquid discharge test device, a light path reflection cavity (7), a high-voltage pulse power supply (16), a photomultiplier tube (18), an oscilloscope (23), a schlieren instrument (25), a light source (26) and a multi-path time sequence trigger signal generation device (15); wherein,
the liquid discharge testing device comprises an experiment cavity (1), experiment electrodes and an electrode adjusting device, wherein the experiment cavity (1) is provided with four observation ports which are distributed on the top surface (11), the front surface (12) and two side surfaces (13) of the cavity, the top of the experiment cavity (1) is provided with a high-voltage sleeve (2), an oil filling port (4) and an air inlet/outlet (5), and the air inlet/outlet (5) is used for vacuumizing the experiment cavity (1); the experimental electrode comprises a ground electrode (8) and a high-voltage electrode (6) which are arranged in the experimental cavity (1), and the electrode adjusting device is arranged in the experimental cavity (1) and is used for changing the position of the ground electrode (8) to adjust the distance and the relative position of the ground electrode (8) and the high-voltage electrode (6); the ground electrode (8) is connected with the shell of the experiment cavity (1), a discharge current leading-out terminal is arranged in the experiment cavity (1), and the discharge current leading-out terminal is connected with the oscilloscope (23) through a current sensor (24) so as to obtain the current waveform of liquid discharge;
the light path reflection cavity (7) is arranged at the top of the experiment cavity body (1), an optical reflection mirror (19) is arranged in the light path reflection cavity (7), is connected with an observation mirror on the top surface of the experiment cavity body (1) and is used for converting a vertical light path generated by liquid discharge into a horizontal light path, and a light path outlet of the light path reflection cavity (7) is connected with an optical observation camera (17) through an observation port (11);
the photomultiplier (18) is connected with an observation port (12) in front of the experiment cavity (1), when a liquid discharge schlieren image is obtained, the schlieren instrument (25) and the light source (26) are connected with two observation ports (13) on the side surface of the experiment cavity (1), and when a three-dimensional discharge image is obtained, two optical observation cameras (17) are connected with the two observation ports (13) on the side surface of the experiment cavity (1);
two ends of the high-voltage pulse power supply (16) are connected in parallel with a capacitive voltage divider (21), and the output end of the high-voltage pulse power supply extends into the experiment cavity (1) through a built-in metal connecting rod (27) of the high-voltage bushing (2) and is connected with the high-voltage electrode (6); the capacitive voltage divider (21) is grounded, and a voltage dividing terminal is connected with the oscilloscope (23) to display an applied voltage waveform;
the multi-channel time sequence trigger signal generating device is used for providing multi-channel time sequence controllable trigger signals for the high-voltage pulse power supply (16), the optical observation camera (17), the schlieren instrument (25), the light source (26) and the photomultiplier (18) and controlling the optical observation camera (17) to shoot at a specified time to obtain a liquid discharge channel space-time evolution development image.
2. The pulse voltage self-triggering liquid discharge spatial-temporal evolution observation system according to claim 1, wherein a barometer (3) is arranged at the top of the experiment cavity (1), an oil drain port (22) is arranged at the bottom of the experiment cavity (1), and a cavity door (14) is arranged on the side of the experiment cavity (1).
3. The system for observing the spatio-temporal evolution of self-triggered liquid discharge under pulsed voltage according to claim 1, wherein the experimental electrodes are in the form of pin-plate electrodes, ball-plate electrodes and plate-plate electrodes.
4. The pulse voltage self-triggering liquid discharge spatial-temporal evolution observation system according to claim 1, wherein the electrode adjusting device comprises a slide rail (9) and a telescopic rod structure (10) which is arranged on the slide rail (9) and can move along the slide rail, the telescopic rod structure (10) is L-shaped, the ground electrode (8) is arranged on the telescopic rod structure (10), the distance adjusting range of the telescopic rod structure (10) moving on the slide rail (9) is 80-150mm, the distance between the ground electrode (8) and the high-voltage electrode (6) is adjusted through the telescopic rod structure (10), and the distance adjusting range is 0-50 mm.
5. The pulse voltage self-triggered liquid discharge spatial-temporal evolution observation system according to claim 1, wherein the air inlet/outlet (5) is connected with a vacuum pump, and the experiment cavity (1) is evacuated by the vacuum pump.
6. The system for observing the spatio-temporal evolution of self-triggered liquid discharges under pulsed voltages according to claim 1, characterized in that the whole experimental chamber (1) has a withstand pressure not less than 5 atm.
7. The pulse voltage self-triggering liquid discharge spatio-temporal evolution observation system according to claim 1, wherein the experimental cavity (1) is a stainless steel sealed cavity, and a layer of epoxy resin is coated on the inner wall of the cavity to increase the electrical insulation distance.
8. The pulse voltage self-triggering liquid discharge spatiotemporal evolution observation system according to claim 1, characterized in that a current limiting resistor (20) is arranged on an output circuit of the high-voltage pulse power supply (16) connected in parallel with the capacitive voltage divider (21).
9. The pulse voltage self-triggering liquid discharge spatial-temporal evolution observation system according to claim 1, wherein the high-voltage pulse power supply (16) is capable of outputting a standard lightning impulse voltage of 0-150 kV.
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| CN109633390A (en) * | 2018-12-19 | 2019-04-16 | 国网青海省电力公司电力科学研究院 | Needle plate electrode discharge impact wave measuring apparatus and corresponding method in a kind of water |
| CN110658427A (en) * | 2019-10-21 | 2020-01-07 | 南方电网科学研究院有限责任公司 | System and method for detecting liquid discharge characteristic |
| CN111751684A (en) * | 2020-07-06 | 2020-10-09 | 华北电力大学 | Insulation material's along surface flashover discharge measuring device under high frequency excitation |
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| CN112067498A (en) * | 2020-07-25 | 2020-12-11 | 东北电力大学 | Discharge in water H2O2Particle space-time density distribution measuring device and measuring method thereof |
| CN112067498B (en) * | 2020-07-25 | 2024-02-13 | 东北电力大学 | In-water discharge H 2 O 2 Particle space-time density distribution measuring device and measuring method thereof |
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| CN115914842A (en) * | 2022-12-06 | 2023-04-04 | 沈阳环境科学研究院 | Pulse discharge plasma channel multi-angle image monocular trapping device and method |
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