CN115728604A - Epoxy sample wafer surface flashover voltage testing device - Google Patents
Epoxy sample wafer surface flashover voltage testing device Download PDFInfo
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- CN115728604A CN115728604A CN202211432252.2A CN202211432252A CN115728604A CN 115728604 A CN115728604 A CN 115728604A CN 202211432252 A CN202211432252 A CN 202211432252A CN 115728604 A CN115728604 A CN 115728604A
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Abstract
The invention discloses a surface flashover voltage testing device for an epoxy sample wafer, which comprises a high-voltage electrode assembly, a ground electrode assembly, a cavity assembly, a movable support assembly, a movable trolley assembly, a door opening mechanism assembly, a power switch, a temperature control unit, a sample switching unit and an air pressure control unit. The sample switching unit drives the movable support component through a rotary driving mechanism, and the rotary driving mechanism adopts a stepping motor matched with a speed reducing motor and a rotary encoder to control the rotating angle and the position of a plurality of test pieces in the switching process; the temperature control unit is communicated with the cavity assembly and is used for measuring and controlling the temperature in the cavity assembly; the air pressure control unit is communicated with the cavity assembly and is used for measuring and controlling the air pressure in the cavity assembly. By adopting the invention, a plurality of insulating material samples can be measured in a single test, and the electric heating coupling is realized by combining the device for heating the air universe in the cavity assembly.
Description
Technical Field
The invention relates to the technical field of insulating material measurement, in particular to a surface flashover voltage testing device for an epoxy sample wafer.
Background
With the development of power systems, the traditional power transmission mode cannot meet the increasing long-distance and large-capacity power transmission requirements. As a substitute for high-voltage transmission lines and power cables, gas insulated transmission lines (Gas I nsu coated transmission ion Li nes, gil) have received much attention due to their good environmental compatibility, compact structure, and larger transmission capacity. At present, in the field of GIL power transmission, a gas-solid interface of an insulating material is an insulating weak link, and a flashover voltage test is a key step for verifying the good and bad insulating property. Therefore, a laboratory needs to perform a lot of tests to explore the surface flashover voltage transformation rule so as to search for an insulating material with excellent surface insulating property. At present, in engineering practice, insulating gas widely used by GIL is SF6, but SF6 has an extremely strong greenhouse effect, has a global warming potential of 23500, has an atmospheric service life of about 3200 years, and is extremely difficult to decompose under natural conditions. In order to achieve the aim of "carbon neutralization", the search for environment-friendly alternative gases is urgently needed, and research on novel gases such as C4F7N, CF3I and the like is being widely carried out.
At present, single-electrode experimental cavities are generally adopted in the surface flashover experiments aiming at the middle insulation materials at home and abroad, the experimental cavity needs to be opened again only when one specific condition can be tested in one experiment, and a large amount of time is consumed for sealing the cavity in the experimental process, so that the experimental period is prolonged. If SF6 is used, gas waste is caused by repeated inflation, and greenhouse gas is discharged; if a novel environment-friendly gas such as C4F7N is used, the test cost increases with the number of tests because the gas is expensive. The existing thermoelectric coupling test device adopts a direct contact heating mode, the surface temperature of the insulating material cannot be directly measured, and the integral temperature uniformity of the insulating material cannot be controlled, so that the relationship between the temperature of the insulating material and the flashover voltage cannot be directly measured and researched.
Disclosure of Invention
The embodiment of the invention provides a device for testing the surface flashover voltage of an epoxy sample wafer, which can effectively solve the problems that the surface temperature of an insulating material cannot be directly measured and the integral temperature uniformity of the insulating material cannot be controlled in the prior art, avoid repeated opening of a cavity, save gas and reduce the test cost and the test time.
An embodiment of the present invention provides an apparatus for testing surface flashover voltage of an epoxy sample wafer, including: the device comprises a high-voltage electrode assembly, a ground electrode assembly, a cavity assembly, a movable support assembly, a movable trolley assembly, a door opening mechanism assembly, a power switch, a temperature control unit, a sample switching unit and a pneumatic control unit;
the cavity component is fixed on the movable trolley component; the door opening mechanism component is welded on the cavity component; the high-voltage electrode assembly is hermetically connected with the cavity assembly through a hexagon bolt, a flat gasket, an elastic gasket and an O-shaped sealing ring, and the high-voltage electrode assembly is connected with the movable support assembly through a lead; the ground electrode assembly is welded on the outer wall of the cavity assembly, penetrates through the cavity wall of the cavity assembly through a conducting wire and leads out of an internal grounding device of the cavity assembly; the movable support assembly is arranged inside the cavity assembly; the power switch is respectively and electrically connected with the temperature control unit, the sample switching unit and the air pressure control unit;
the sample switching unit drives the movable support component through a rotary driving mechanism, and the rotary driving mechanism adopts a stepping motor matched with a speed reducing motor and a rotary encoder to control the rotating angle and the position of the plurality of test pieces in the switching process; the temperature control unit is communicated with the cavity assembly and is used for measuring and controlling the temperature in the cavity assembly; the air pressure control unit is communicated with the cavity assembly and is used for measuring and controlling the air pressure in the cavity assembly.
In one possible implementation manner, the sample switching unit comprises a PLC control assembly, a rotating shaft, a vertical push rod, a speed reducer mounting seat, an encoder mounting seat, a push rod mounting seat, a speed reduction motor, a rotary encoder, an electric cylinder, an operating handle, a position display screen and a position adjusting knob;
the rotary encoder determines a required rotation angle according to the PLC control assembly instruction, and is matched with the speed reduction motor to drive the rotating shaft to adjust the position in the horizontal direction, so that closed-loop control is realized; the position display screen reports a rotation angle, and the position adjustment knob controls the rotation angle; the vertical push rod is controlled to adjust the position in the vertical direction through an operating handle, and the electric cylinder drives the vertical push rod.
In a possible implementation manner, the rotating shaft, the vertical push rod, the speed reducer mounting seat, the push rod mounting seat, the speed reduction motor and the electric cylinder are all mounted at the bottom of the cavity assembly in an external manner, and the shaft extends into the cavity through a bottom cover of the cavity assembly.
In a possible implementation manner, the rotating shaft, the vertical push rod, the speed reducer mounting seat, the push rod mounting seat, the speed reduction motor and the electric cylinder are all mounted in a shaft seal structure type of a sealing mounting flange.
In one possible implementation, the air pressure control unit includes: the device comprises an absolute pressure sensor, a vacuum Pirani gauge, a first vacuum ball valve, a 90-degree elbow, a pumping joint, a second vacuum ball valve, an inflation valve, an air release valve, a vacuum pump, an oil-gas separator, a metal corrugated pipe, a start-stop switch, a vacuum display meter, a pressure display meter and a pressure release valve;
the vacuum pump is connected with the metal corrugated pipe and is connected into the cavity of the cavity assembly through the pumping joint and the first vacuum ball valve; the vacuum Pirani gauge is connected with the second vacuum ball valve through the 90-degree elbow, the vacuum Pirani gauge is connected into a cavity of the cavity assembly to measure atmospheric pressure, and real-time atmospheric pressure is displayed through the vacuum display meter;
the inflation valve is connected with an external test gas bottle body, the deflation valve is connected with an external waste collection bottle body, and the pressure relief valve is used for releasing pressure through the top opening valve inner sheet when the pressure is greater than a preset pressure value;
the absolute pressure sensor is used for measuring the air pressure in a high air pressure state and displaying the real-time air pressure through the pressure display meter;
the vacuum pump adopts a two-stage rotary vane, and the oil-gas separator is arranged at the exhaust port of the vacuum pump, so that oil injection at the outlet of the vacuum pump is prevented, and the air exhaust noise is reduced;
and a hose joint is arranged at the outlet of the oil-gas separator, and gas is discharged outdoors through a hose.
The vacuum pump is started and stopped manually through the start-stop switch, and the start-stop switch is of a knob type.
In one possible implementation manner, the temperature control unit comprises a temperature sensor, an exhaust valve, a water path communicating pipe, a temperature display meter, a heat insulation layer, an axial flow fan and a fan power supply lead-in electrode;
the temperature sensor is used for measuring the temperature of a fixed position in the cavity assembly, and the temperature display meter displays the temperature of the temperature sensor; the exhaust valve is used when oil is introduced for the first time, and exhausts air in the cavity pipeline; the waterway valve is connected with a high-temperature oil pump outside the cavity assembly; the waterway communicating pipe is connected with a cavity waterway of the cavity assembly, and the waterway communicating pipe is also connected with a heat-insulating layer to limit heat loss; the axial flow fan forms a heat circulation loop to even the temperature in the cavity.
In a possible implementation manner, two high-temperature circulating fans are installed above the cavity of the cavity assembly side by side, and the exhaust directions of the two fans are opposite.
In one possible implementation, the cavity assembly is a vertical double-wall cylindrical container; the bottom of the vertical double-layer wall cylindrical container adopts a flat sealing bottom, and the upper part of the vertical double-layer wall cylindrical container adopts an elliptical sealing head; the upper end of the double-layer wall and the lower end of the jacket are provided with flow equalizing rings, and the top of the double-layer wall is provided with an air release port and an air release valve; two observation sight glasses are 90 degrees distributions on the cavity barrel circumference, the observation sight glass adopts borosilicate glass, and the mounted position of motion is reserved to the cavity bottom, and the cavity leaves and is used for filling gassing interface, operation hand hole, and the cavity internal surface carries out polishing treatment, and cavity metal surface carries out polishing treatment or sandblast and handles, and the outer cladding of cavity is the heat preservation of predetermineeing thickness.
In one possible implementation, the movable support assembly includes a plurality of sample holders, a plurality of insulating mounting plates, and a circular rotary mounting support;
the plurality of sample wafer fixing devices are perpendicular to the circumferential direction of the circular rotary mounting bracket and are parallel to each other; each sample holder is provided with an insulating mounting plate, and the insulating mounting plate is used for combining an upper metal pressing block, a lower metal pressing block and a bolt to press the test piece; the upper side and the lower side of the insulating mounting plate are respectively provided with a metal guide rod, the metal guide rods of the upper side and the lower side are respectively inserted into mounting holes of an upper fixing ring and a lower fixing ring of the rotary mounting support, the metal guide rods and the mounting holes are in clearance fit, and an upper metal pressing block and a lower metal pressing block are respectively connected with the upper metal guide rod and the lower metal guide rod through threads.
In one possible implementation, the trolley assembly is provided with four casters, two of which are fixed casters, and the other two casters are universal casters and are provided with a brake device.
Compared with the prior art, the epoxy sample wafer surface flashover voltage testing device provided by the embodiment of the invention can measure the test cavities of a plurality of insulating material samples in a single test by the mutual matching of the sample switching unit and the movable bracket component: different insulating materials to be tested are manually arranged on the movable support component, the sample wafer is arranged by adopting an insulating mounting plate in the vertical direction, and the test wafer is pressed on the insulating mounting plate by an upper metal pressing block, a lower metal pressing block and a bolt. A plurality of different insulating materials can be installed through the circular rotary installation support, repeated opening of the cavity is avoided, gas is saved, and test cost and test time are reduced.
The sample switching unit and the replacement device formed by combining the movable support component realize sample switching by combining rotary motion and linear motion, and have the advantages of simple operation method, low failure rate, accurate sample position adjustment, good contact with an electrode and capability of ensuring smooth test. In the temperature control unit, a device for heating the air in the test cavity in the whole domain is designed, so that the temperature in the test cavity is uniformly distributed, and the temperature of the insulating material is uniformly distributed. The temperature control range is wider, and the control mode is more flexible.
Drawings
FIG. 1 is a front view of an apparatus for testing surface flashover voltage of an epoxy sample wafer according to an embodiment of the present invention;
FIG. 2 is a side view of an apparatus for testing a surface flashover voltage of an epoxy sample wafer according to an embodiment of the present invention;
fig. 3 is a rear view of an apparatus for testing a surface flashover voltage of an epoxy sample wafer according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Referring to fig. 1 to 3, which are a front view, a side view and a back view of a structure of an epoxy sample flashover voltage testing apparatus according to an embodiment of the present invention, respectively, the structure includes:
the device comprises a cavity component 1, a high-voltage electrode component 2, a ground electrode component 3, a movable support component 4, a movable trolley component 5, a door opening mechanism component 7, a power switch 31, a temperature control unit, a sample switching unit and an air pressure control unit.
The cavity component 1 is fixed on the movable trolley component 5; the door opening mechanism component 7 is welded on the cavity component 1; the high-voltage electrode assembly 2 is hermetically connected with the cavity assembly 1 through a hexagon bolt 39, a flat gasket 40, an elastic gasket 41 and an O-shaped sealing ring 44, and the high-voltage electrode assembly 2 is connected with the movable support assembly 4 through a lead; the ground electrode assembly 3 is welded on the outer wall of the cavity assembly 1, and the ground electrode assembly 3 penetrates through the cavity wall of the cavity assembly 1 through a conducting wire and leads out an internal grounding device of the cavity assembly 1; the movable support assembly 4 is arranged inside the cavity assembly 1; the power switch 31 is electrically connected with the temperature control unit, the sample switching unit and the air pressure control unit respectively.
The sample switching unit drives the movable support component 4 through a rotary driving mechanism, and the rotary driving mechanism adopts a stepping motor matched with a speed reducing motor and a rotary encoder to control the rotating angle and the position of the plurality of test pieces in the switching process; the temperature control unit is communicated with the cavity assembly 1 and is used for measuring and controlling the temperature in the cavity assembly 1; the air pressure control unit is communicated with the cavity assembly 1 and is used for measuring and controlling the air pressure in the cavity assembly 1.
Generally, the high-voltage electrode assembly 2 introduces high voltage into the cavity assembly 1, and in order to prevent partial discharge at the access end, a voltage-equalizing cap and a voltage-equalizing ball are designed and installed at the high-voltage access end of the high-voltage bushing; in the ground electrode assembly 3, a reliable insulated ground electrode needs to be installed, and all internal grounds are connected out through the insulated ground electrode, so that the electrical safety in the test process is ensured; the door opening mechanism needs to adopt an opening-closing type structure, is reinforced through bolts and is provided with a sealing ring, so that the air tightness of a cavity is ensured to be good after the door is closed; the hexagonal bolt 39, the flat gasket 40, the elastic gasket 41 and the O-shaped sealing ring 44 jointly ensure that the high-pressure component is tightly connected with the cavity, and the air tightness is good.
Illustratively, the sample switching unit includes a PLC control assembly 6, a rotating shaft 8, a vertical push rod 9, a reducer mounting base 10, an encoder mounting base 11, a push rod mounting base 12, a reduction motor 26, a rotary encoder 27, an electric cylinder 28, an operation handle 33, a position display screen 34, and a position adjusting knob 35.
The rotary encoder 27 determines the required rotation angle according to the instruction of the PLC control assembly 6, and is matched with the speed reduction motor 26 to drive the rotating shaft 8 to adjust the position in the horizontal direction, so that closed-loop control is realized; the position display screen 34 reports the rotation angle, and the position adjustment knob 35 controls the rotation angle; the position of the vertical push rod 9 in the vertical direction is controlled by an operating handle 33, and the electric cylinder drives the vertical push rod 9.
In order to switch a plurality of test pieces to be measured simultaneously in one experiment, the embodiment of the invention designs a switching driving mechanism for manufacturing the test pieces, and the test pieces are switched in a rotating mode. The rotation driving mechanism adopts a stepping motor matched with a speed reducer and a rotary encoder 27 to realize the control of the rotation angle and the position in the switching process. The encoder determines the required rotation angle according to the instruction of the PLC control assembly 6, and the encoder is matched with the reduction motor 26 to drive the rotating shaft 8 to adjust the position in the horizontal direction, so that closed-loop control can be realized to reduce the accumulated error to the maximum extent; the position display screen 34 reports the rotation angle, which is controlled by the position adjustment knob 35; in order to control the on-off of high voltage in the test process, an on-off control structure is designed, and a high-voltage on-off device adopts a linear motion structure. The linear on-off device adopts an electric cylinder, the propelling distance can be accurately controlled by closed-loop control, the electric cylinder drives the vertical push rod 9 to adjust the position in the vertical direction, and the position is controlled by the operating handle 33.
Illustratively, the rotating shaft 8, the vertical push rod 9, the speed reducer mounting seat 10, the push rod mounting seat, the speed reduction motor 26 and the electric cylinder are all mounted at the bottom of the cavity assembly 1 in an external mode, and the shaft extends into the cavity through a bottom sealing cover of the cavity assembly 1.
In order to avoid the influence of an electric field on the motion control device, in the embodiment of the invention, the main body of the motion mechanism is completely externally arranged; the two transmission structures are arranged at the bottom of the cavity, and an actuating shaft extends into the cavity through the cavity bottom sealing cover.
Illustratively, the rotating shaft 8, the vertical push rod 9, the reducer mounting seat 10, the push rod mounting seat, the reduction motor 26, and the electric cylinder are all mounted in a shaft seal structure type of a sealing mounting flange.
In order to ensure the requirement of the sealing performance of the cavity, a shaft seal structure needs to be designed to ensure the sealing in the moving process, the embodiment of the invention considers that the sealing element is abraded after long-term use, and the shaft seal structure is realized by adopting a sealing installation flange mode, namely all sealing structures are arranged on the installation flange of the moving mechanism. Therefore, when the seal is worn and failed, the seal can be conveniently detached and replaced.
Illustratively, the air pressure control unit includes: the device comprises an absolute pressure sensor 13, a vacuum Pirani gauge 15, a first vacuum ball valve 19, a 90-degree elbow 17, a pumping connector 18, a second vacuum ball valve 16, an inflation valve 20, a deflation valve 21, a vacuum pump 25, an oil-gas separator 29, a metal corrugated pipe 30, a start-stop switch 32, a vacuum display meter 36, a pressure display meter 37 and a pressure release valve 42.
The vacuum pump 25 is connected with the metal corrugated pipe 30 and is connected into the cavity of the cavity assembly 1 through the pumping joint 18 and the first vacuum ball valve 19; the vacuum Pirani gauge 15 is connected with the second vacuum ball valve 16 through the 90-degree elbow 17, the vacuum Pirani gauge 15 is connected to the atmospheric pressure measured in the cavity of the cavity assembly 1, and the real-time atmospheric pressure is displayed through the vacuum display meter 36.
The inflation valve 20 is connected with an external test gas bottle body, the deflation valve 21 is connected with an external waste collection bottle body, and the pressure relief valve 42 is used for releasing pressure by opening the valve inner sheet through a top valve when the pressure is greater than a preset pressure value;
the absolute pressure sensor 13 is used for measuring the air pressure in a high air pressure state, and the real-time air pressure is displayed through the pressure display meter 37;
the vacuum pump 25 adopts a double-stage rotary vane, and the oil-gas separator 29 is arranged at the discharge port of the vacuum pump 25, so that oil injection at the outlet of the vacuum pump 25 is prevented, and the air exhaust noise is reduced.
And a hose joint is arranged at the outlet of the oil-gas separator 29, and gas is discharged outdoors through a hose.
The vacuum pump 25 is manually started and stopped by the start-stop switch, and the start-stop switch is of a knob type.
In the embodiment, the vacuum pump 25 is connected with the metal corrugated pipe 30, and is connected into the cavity through the pumping joint 18 and the first vacuum ball valve 19, the valve is opened when the vacuum pumping is needed, and the valve is closed to protect the vacuum pump 25 when the high-pressure gas is needed to be filled; the vacuum pirani gauge 15 is connected to the second vacuum ball valve 16 through a 90-degree elbow 17, and is connected to the inside of the chamber, and in terms of the general arrangement, the vacuum pirani gauge 15 of the present embodiment can measure the atmospheric pressure of 0.1Mpa, and the real-time atmospheric pressure is displayed by the vacuum display meter 36.
The inflation valve 20 is connected with the test gas bottle body, the deflation valve 21 is connected with the waste collection bottle body, the pressure relief valve 42 is used for opening the valve inner sheet when the pressure is larger than a set value so as to release the pressure in time, and the original position is recovered after the pressure is reduced.
Illustratively, the temperature control unit includes a temperature sensor 14, an exhaust valve 22, a water way valve 23, a water way communicating pipe 24, a temperature display meter 38, an insulating layer 43, an axial flow fan 45 and a fan power lead-in electrode 46.
The temperature sensor 14 is used for measuring the temperature of a fixed position in the cavity assembly 1, and the temperature display table 38 displays the temperature of the temperature sensor 14; the exhaust valve 22 is used when oil is introduced for the first time, and exhausts air in the cavity pipeline; the water path valve 23 is connected with a high-temperature oil pump outside the cavity assembly 1; the waterway communicating pipe 24 is connected with a cavity waterway of the cavity assembly 1, and the waterway communicating pipe 24 is also connected with a heat-insulating layer to limit heat loss; the axial fan 45 forms a heat circulation loop to equalize the temperature in the cavity.
Two temperature sensors 14 measure the temperature at fixed locations within the chamber and a temperature display 38 displays the temperature of the two temperature sensors 14, and in general, the chamber temperature is considered to be uniformly distributed when the difference between the two readings is < 5 ℃. The discharge valve 22 is used when oil is introduced for the first time, air in the cavity pipeline is discharged, the waterway valve 23 is connected with the high-temperature oil pump outside the cavity, the waterway communicating pipe 24 is connected with the cavity waterway, the heat preservation layer is connected to limit heat dissipation, the gas temperature in the cavity in a short time is in a stable state, the axial flow fan 45 forms a heat circulation loop, and the temperature in the cavity is uniform.
The whole heating and refrigerating scheme is carried out uniformly by adopting a medium heat circulation mode. The circulating medium adopts heat conduction oil with insulating property; a heat-conducting oil circulation temperature control system is adopted as a heating heat source and a refrigeration and circulation power source. Generally, the oil medium has a minimum temperature of-10 ℃ maximum temperature of 150 ℃.
Illustratively, two high-temperature circulating fans are installed side by side above the cavity of the cavity assembly 1, and the exhaust directions of the two fans are opposite.
In this embodiment, for the inside heat transfer efficiency who improves heating sample wafer process, install two high temperature circulating fan side by side in the top of cavity, the pump drainage gas opposite direction of two fans can open the fan like this at the heating process and make the inside convection current circulation that realizes of cavity for the intensification process.
Illustratively, the chamber body assembly 1 is a vertical double-wall cylindrical container; the bottom of the vertical double-layer wall cylindrical container adopts a flat sealing bottom, and the upper part of the vertical double-layer wall cylindrical container adopts an elliptical sealing head; the upper end of the double-layer wall and the lower end of the jacket are provided with flow equalizing rings, and the top of the double-layer wall is provided with an air release port and an air release valve; two observation sight glasses are 90 degrees distributions on the cavity barrel circumference, the observation sight glass adopts borosilicate glass, and the mounted position of motion is reserved to the cavity bottom, and the cavity leaves and is used for filling gassing interface, operation hand hole, and the cavity internal surface carries out polishing treatment, and cavity metal surface carries out polishing treatment or sandblast and handles, and the outer cladding of cavity is the heat preservation of predetermineeing thickness.
Illustratively, the mobile rack assembly 4 includes a plurality of coupon holders, a plurality of insulating mounting plates, and a circular rotating mounting rack.
The plurality of sample wafer fixing devices are perpendicular to the circumferential direction of the circular rotary mounting bracket and are parallel in pairs; each sample holder is provided with an insulating mounting plate, and the insulating mounting plate is used for combining an upper metal pressing block, a lower metal pressing block and a bolt to press the test piece; the upper side and the lower side of the insulating mounting plate are respectively provided with a metal guide rod, the metal guide rods of the upper side and the lower side are respectively inserted into mounting holes of an upper fixing ring and a lower fixing ring of the rotary mounting support, the metal guide rods and the mounting holes are in clearance fit, and an upper metal pressing block and a lower metal pressing block are respectively connected with the upper metal guide rod and the lower metal guide rod through threads.
In this embodiment, the upper and lower metal pressing blocks are respectively connected with the upper and lower metal guide rods through threads. Therefore, when a high voltage is applied to carry out a test, the upper guide rod is in contact with the high-voltage electrode rod, and the lower guide rod is in contact with the vertical linear motion mechanism.
Illustratively, the mobile cart assembly 5 mounts four casters, two of which are fixed casters and the other two of which are casters and include brakes.
Compared with the prior art, the epoxy sample wafer surface flashover voltage testing device provided by the embodiment of the invention can measure the test cavities of a plurality of insulating material samples in a single test by the mutual matching of the sample switching unit and the movable bracket component 4: different insulating materials to be tested are manually arranged on the movable bracket component 4, the sample wafer is arranged by adopting an insulating mounting plate in the vertical direction, and the test wafer is pressed on the insulating mounting plate by an upper metal pressing block, a lower metal pressing block and a bolt. A plurality of different insulating materials can be installed through the circular rotary installation support, repeated opening of the cavity is avoided, gas is saved, and test cost and test time are reduced.
The sample switching unit and the replacement device formed by combining the movable support component 4 realize sample switching by adopting a mode of combining rotation and linear motion, have simple operation method, low failure rate, accurate sample position adjustment and good contact with an electrode, and ensure the smooth operation of a test. In the temperature control unit, a device for heating the air in the test cavity in the whole domain is designed, so that the temperature in the test cavity is uniformly distributed, and the temperature of the insulating material is uniformly distributed. The temperature control range is wider, and the control mode is more flexible.
An embodiment of the present invention provides a method for using an apparatus for synchronously testing surface flashover voltage and multiple points of an epoxy sample wafer, which can be applied to the above apparatus embodiment, taking four samples as an example for measurement, and includes the following steps:
step S1, connecting a test circuit, connecting a high-voltage electrode assembly 2 with an external circuit power supply, connecting a ground electrode with the ground, manually installing different insulating materials to be tested on a movable support assembly 4, installing a sample by adopting an insulating installation plate in the vertical direction, and pressing a test piece on the insulating installation plate by using an upper metal pressing block, a lower metal pressing block and a bolt. Four different insulating materials can be installed simultaneously by means of a circular rotating installation frame. The power switch 31 is turned on, and the rest of the components of the control and display unit are all adjusted to be in the off state. The door opening mechanism assembly 7 is closed and all flanges thereon are locked. And opening the vacuum pump, and observing the vacuum display meter and the pressure display meter until the vacuum state is achieved by pumping. The test gas cylinder is connected with an inflation valve through a guide pipe, and the exhaust valve is connected with a waste gas collecting cylinder.
And S2, setting air pressure, turning on a start-stop switch, starting the vacuum pump to work, observing the pressure display indicating number, and turning off the start-stop switch until the vacuum state is approached. And opening the inflation valve to inflate, observing the pressure display number until the air pressure required by the test is reached, and closing the inflation valve.
And S3, setting the temperature, leading in an electrode of the axial flow motor through a fan power supply to be connected with a power supply, and starting to work. Opening discharge valve, the water route valve links to each other with the high temperature oil pump, begins to annotate oil in the water route, treats that the water route is full of oil, closes discharge valve, and the water route constitutes the circulation water route with the outer high temperature oil pump of cavity in the cavity intermediate layer this moment, sets for the high temperature oil pump temperature to experimental required temperature, treats that two readings of temperature display table tend to stabilize and the difference is less hour, and the representative temperature tends to stabilize, gets into next step.
And S4, measuring the flashover voltage of the sample, adjusting the operating handle 33 to be in a rising state, connecting the high-voltage electrode assembly 2 with the movable support assembly 4, communicating the circuit, pressurizing the material surface through an external circuit to generate flashover, manually recording the voltage reading of the external circuit as the external applied voltage indicating number and the state of the insulating material, and recording the temperature and the air pressure state through the temperature display meter and the pressure display meter to finish the recording of a group of data.
And step S5, after the test piece test is finished, turning off the power supply of the external circuit. When the operating handle 33 is adjusted to a descending state, the electric cylinder drives the vertical push rod 9 to descend, at the moment, the sample piece and the mounting piece automatically fall under the action of gravity, and one end of the high voltage is also separated from the high-voltage electrode rod; the position adjusting knob 35 is adjusted, and the process adopts a inching mode. After the system determines an absolute zero position through the feedback of an absolute encoder of the movement mechanism, the switching device rotates by 90 degrees every time the system moves once; repeat step 4 until the measurement of four samples is completed.
The encoder determines the required rotation angle according to the instruction of the PLC control assembly 6, and the encoder is matched with the reduction motor 26 to drive the rotating shaft 8 to adjust the position in the horizontal direction, so that closed-loop control can be realized to reduce the accumulated error to the maximum extent; the position display screen 34 reports the rotation angle, which is controlled by the position adjustment knob 35;
s6, completing the test, closing the external circuit power switch 31, and opening a vent valve to release the test gas; the operating handle 33 is adjusted to the lowered state, and the power switch 31 is turned off.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. The device for testing the surface flashover voltage of the epoxy sample wafer is characterized by comprising a high-voltage electrode assembly, a ground electrode assembly, a cavity assembly, a movable support assembly, a movable trolley assembly, a door opening mechanism assembly, a power switch, a temperature control unit, a sample switching unit and a pneumatic control unit;
the cavity component is fixed on the movable trolley component; the door opening mechanism component is welded on the cavity component; the high-voltage electrode assembly is hermetically connected with the cavity assembly through a hexagon bolt, a flat gasket, an elastic gasket and an O-shaped sealing ring, and the high-voltage electrode assembly is connected with the movable support assembly through a lead; the ground electrode assembly is welded on the outer wall of the cavity assembly, penetrates through the cavity wall of the cavity assembly through a conducting wire and leads out of an internal grounding device of the cavity assembly; the movable support assembly is arranged inside the cavity assembly; the power switch is respectively and electrically connected with the temperature control unit, the sample switching unit and the air pressure control unit;
the sample switching unit drives the movable support component through a rotary driving mechanism, and the rotary driving mechanism adopts a stepping motor matched with a speed reducing motor and a rotary encoder to control the rotating angle and the position of a plurality of test pieces in the switching process; the temperature control unit is communicated with the cavity assembly and is used for measuring and controlling the temperature in the cavity assembly; the air pressure control unit is communicated with the cavity assembly and is used for measuring and controlling the air pressure in the cavity assembly.
2. The apparatus for testing the surface flashover voltage of the epoxy sample wafer according to claim 1, wherein the sample switching unit comprises a PLC control assembly, a rotating shaft, a vertical push rod, a reducer mounting seat, an encoder mounting seat, a push rod mounting seat, a speed reducing motor, a rotary encoder, an electric cylinder, an operating handle, a position display screen and a position adjusting knob;
the rotary encoder determines a required rotation angle according to the PLC control assembly instruction, and is matched with the speed reduction motor to drive the rotating shaft to adjust the position in the horizontal direction, so that closed-loop control is realized; the position display screen reports a rotation angle, and the position adjustment knob controls the rotation angle; the vertical push rod is controlled by an operating handle to adjust the position in the vertical direction, and the electric cylinder drives the vertical push rod.
3. The apparatus for testing surface flashover voltage of an epoxy sample wafer as claimed in claim 2, wherein the rotating shaft, the vertical push rod, the speed reducer mounting seat, the push rod mounting seat, the speed reduction motor and the electric cylinder are all mounted at the bottom of the cavity assembly in an external manner, and the shaft extends into the cavity through a bottom cover of the cavity assembly.
4. The apparatus for testing surface flashover voltage of an epoxy sample wafer as claimed in claim 2, wherein the rotating shaft, the vertical push rod, the reducer mounting seat, the push rod mounting seat, the reduction motor and the electric cylinder are all mounted in a shaft seal structure type of a sealing mounting flange.
5. The apparatus for testing surface flashover voltage of an epoxy sample wafer according to claim 1, wherein the air pressure control unit comprises: the device comprises an absolute pressure sensor, a vacuum Pirani gauge, a first vacuum ball valve, a 90-degree elbow, a pumping joint, a second vacuum ball valve, an inflation valve, an air release valve, a vacuum pump, an oil-gas separator, a metal corrugated pipe, a start-stop switch, a vacuum display meter, a pressure display meter and a pressure release valve;
the vacuum pump is connected with the metal corrugated pipe and is connected into the cavity of the cavity assembly through the pumping joint and the first vacuum ball valve; the vacuum Pirani gauge is connected with the second vacuum ball valve through the 90-degree elbow, the vacuum Pirani gauge is connected into a cavity of the cavity assembly to measure atmospheric pressure, and real-time atmospheric pressure is displayed through the vacuum display meter;
the inflation valve is connected with an external test gas bottle body, the deflation valve is connected with an external waste collection bottle body, and the pressure relief valve is used for releasing pressure by opening the valve inner sheet through the top when the pressure is greater than a preset pressure value;
the absolute pressure sensor is used for measuring the air pressure in a high air pressure state and displaying the real-time air pressure through the pressure display meter;
the vacuum pump adopts a two-stage rotary vane, and the oil-gas separator is arranged at the exhaust port of the vacuum pump, so that oil injection at the outlet of the vacuum pump is prevented, and the air exhaust noise is reduced;
a hose joint is arranged at the outlet of the oil-gas separator, and gas is discharged out of the room through a hose;
the vacuum pump is started and stopped manually through the start-stop switch, and the start-stop switch is of a knob type.
6. The apparatus for testing surface flashover voltage of the epoxy sample wafer according to claim 1, wherein the temperature control unit comprises a temperature sensor, an exhaust valve, a water path communicating pipe, a temperature display meter, an insulating layer, an axial flow fan and a fan power supply leading-in electrode;
the temperature sensor is used for measuring the temperature of a fixed position in the cavity assembly, and the temperature display meter displays the temperature of the temperature sensor; the exhaust valve is used when oil is introduced for the first time, and exhausts air in the cavity pipeline; the waterway valve is connected with a high-temperature oil pump outside the cavity assembly; the waterway communicating pipe is connected with a cavity waterway of the cavity assembly, and the waterway communicating pipe is also connected with a heat-insulating layer to limit heat loss; the axial flow fan forms a heat circulation loop to even the temperature in the cavity.
7. The apparatus for testing surface flashover voltage of an epoxy sample wafer according to claim 1, wherein two high temperature circulating fans are arranged side by side above the cavity of the cavity assembly, and the pumping and exhausting directions of the two fans are opposite.
8. The apparatus for testing surface flashover voltage of an epoxy sample wafer as claimed in claim 1, wherein the chamber assembly is a vertical double-walled cylindrical container; the bottom of the vertical double-layer wall cylindrical container adopts a flat sealing bottom, and the upper part of the vertical double-layer wall cylindrical container adopts an elliptical sealing head; the upper end of the double-layer wall and the lower end of the jacket are provided with flow equalizing rings, and the top of the double-layer wall is provided with an air release port and an air release valve; two observation sight glasses are 90 degrees distributions on the cavity barrel circumference, the observation sight glass adopts borosilicate glass, and the mounted position of motion is reserved to the cavity bottom, and the cavity leaves and is used for filling gassing interface, operation hand hole, and the cavity internal surface carries out polishing treatment, and cavity metal surface carries out polishing treatment or sandblast and handles, and the outer cladding of cavity is the heat preservation of predetermineeing thickness.
9. The apparatus for testing surface flashover voltage of an epoxy sample wafer according to claim 1, wherein the moving rack assembly comprises a plurality of sample wafer holders, a plurality of insulating mounting plates and a circular rotating mounting rack;
the plurality of sample wafer fixing devices are perpendicular to the circumferential direction of the circular rotary mounting bracket and are parallel to each other; each sample holder is provided with an insulating mounting plate, and the insulating mounting plate is used for combining an upper metal pressing block, a lower metal pressing block and a bolt to press the test piece; the upper side and the lower side of the insulating mounting plate are respectively provided with a metal guide rod, the metal guide rods of the upper side and the lower side are respectively inserted into mounting holes of an upper fixing ring and a lower fixing ring of the rotary mounting support, the metal guide rods and the mounting holes are in clearance fit, and an upper metal pressing block and a lower metal pressing block are respectively connected with the upper metal guide rod and the lower metal guide rod through threads.
10. The apparatus for testing surface flashover voltage of an epoxy sample wafer as claimed in claim 1, wherein the moving cart assembly is provided with four casters, two of which are fixed casters and the other two of which are universal casters and are provided with a braking device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211432252.2A CN115728604A (en) | 2022-11-14 | 2022-11-14 | Epoxy sample wafer surface flashover voltage testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211432252.2A CN115728604A (en) | 2022-11-14 | 2022-11-14 | Epoxy sample wafer surface flashover voltage testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115728604A true CN115728604A (en) | 2023-03-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211432252.2A Pending CN115728604A (en) | 2022-11-14 | 2022-11-14 | Epoxy sample wafer surface flashover voltage testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115728604A (en) |
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2022
- 2022-11-14 CN CN202211432252.2A patent/CN115728604A/en active Pending
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