Insulating material flashover experiment device and method capable of automatically replacing sample piece

Abstract

The invention discloses an insulating material flashover experiment device and method capable of automatically replacing a sample piece. The device comprises a metal tank body, an insulator upper cover, an insulating sample piece, a charge injection assembly, a charge measurement assembly, a surface flashover assembly and a sample piece replacement assembly, the insulator upper cover is buckled at an upper tank opening of the metal tank body in a sealing manner; a high-voltage guide rod is vertically arranged at the center of the insulator upper cover; an observation window is arranged in the middle of a side plate of the metal tank body. The charge injection assembly and the charge measurement assembly are located in the middle of the side plate of the metal tank body and face each other. The surface flashover assembly is assembled between the high-pressure guide rod and the bottom plate of the metal tank body; and the sample piece replacement assembly is positioned below the charge injection assembly and the charge measurement assembly. The insulation sample piece can be automatically replaced in the device without an unsealing device, the manual operation process of device unsealing, sample piece replacement and device re-sealing in a traditional mode is omitted, the replacement time of the insulation sample piece is greatly saved, the experiment period is effectively shortened, and the experiment efficiency is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical experiments, and in particular relates to an insulating material flashover experiment device and method for automatically replacing sample pieces. Background Art

[0002] In the power system, the large-scale application of AC gas-insulated metal-enclosed switchgear (GIS) and gas-insulated transmission lines (GIL) has effectively promoted the development of miniaturization and gas insulation of power equipment. However, due to the problem of surface flashover of basin-type insulators caused by charge accumulation, AC gas-insulated metal-enclosed switchgear (GIS) and gas-insulated transmission lines (GIL) have failed to make substantial breakthroughs for a long time, and their industrial application still faces difficulties.

[0003] Therefore, studying the influence of surface charge on the surface flashover characteristics of insulating media under the action of DC electric field is of great significance to promote the industrial application of AC gas-insulated metal-enclosed switchgear (GIS) and gas-insulated transmission lines (GIL).

[0004] The accumulation of charge at the gas-solid interface is an important factor leading to insulation breakdown. It will aggravate the electric field distortion in the local area of ​​the solid medium surface, and then ionize more free charges, providing conditions for flashover, which will cause high-voltage equipment to fail or even burn out.

[0005] Since the existing related studies mainly use the measurement of the surface charge density of insulating materials as a research method, there is a lack of quantitative research on the surface flashover characteristics of insulators after surface charge accumulation. Under the action of surface charge, the changing characteristics of the surface flashover characteristics of insulating media are still unclear. Through existing research methods, it is impossible to construct the correlation characteristics between charge accumulation on the surface of insulating materials and surface flashover, and it is also impossible to provide effective theoretical guidance for the insulation optimization design of pot-type insulators.

[0006] To this end, a Chinese patent application with patent application number 202311256645.7 discloses a device and method for surface charge injection, measurement and surface flashover experiment of insulating materials. The scheme can complete the charge injection on the surface of the insulating material, and at the same time can measure the charge density on the surface of the insulating material. Under the action of the surface charge, the surface flashover experiment of the insulating material can be further realized. The changing characteristics of the surface flashover characteristics of the insulating medium are clarified through experiments, and then the correlation characteristics between the charge accumulation on the surface of the insulating material and the surface flashover can be constructed, which can provide effective theoretical guidance for the insulation optimization design of pot-type insulators.

[0007] However, when the above solution is adopted, only one insulation sample piece can be tested in the device at a time. If the insulation sample piece needs to be replaced after the experiment, the device must be reopened to remove the old insulation sample piece, and then the new insulation sample piece must be placed in the device, and the device must be closed again before the experiment can be continued. Therefore, each replacement of the insulation sample piece requires manpower, and the replacement process will take more time to complete, which prolongs the experimental cycle and reduces the experimental efficiency. Summary of the invention

[0008] In view of the problems existing in the prior art, the present invention provides an insulating material flashover experimental device and method for automatically replacing sample pieces. The insulating sample pieces can be automatically replaced in the device. There is no need to unseal the device during the automatic replacement of the insulating sample pieces, which eliminates the manual operation processes of unsealing the device, replacing the sample pieces, and resealing the device in the traditional way, greatly saving the time for replacing the insulating sample pieces, effectively shortening the experimental cycle, and further improving the experimental efficiency.

[0009] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an insulating material flashover experimental device for automatically replacing sample pieces, comprising a metal tank body, an insulator upper cover, an insulating sample piece, a charge injection component, a charge measurement component, a surface flashover component and a sample piece replacement component; the insulator upper cover sealing buckle is installed at the upper tank mouth of the metal tank body, and three openings are circumferentially arranged in the middle of the side plate of the metal tank body, and the first insulating cover, the second insulating cover and the observation window are respectively fixed on the three openings, and the first insulating cover and the second insulating cover are arranged opposite to each other; two openings are circumferentially arranged at the lower part of the side plate of the metal tank body A third insulating cover and a fourth insulating cover are respectively fixed on the two openings, and the third insulating cover is arranged opposite to the fourth insulating cover; the first insulating cover is used to fit the charge injection component; the second insulating cover is used to fit the charge measurement component; a high-voltage conductor is vertically fixed at the center of the insulator upper cover; the surface flashover component is fitted between the high-voltage conductor and the bottom plate of the metal tank body, an insulating gas injection port is provided on the bottom plate of the metal tank body, and the metal tank body is grounded through a wire; the sample piece replacement component is assembled between the third insulating cover and the fourth insulating cover; the insulating sample piece is located inside the metal tank body.

[0010] The insulating sample piece adopts a circular structure, and a plurality of measuring points are marked on the upper surface of the insulating sample piece.

[0011] The measuring points are distributed in a plurality of circles along the radial direction relative to the center of the insulating sample piece, and the measuring points on each circle are distributed at equal intervals along the circumferential direction.

[0012] The charge injection assembly includes a first DC power supply, a first resistor, a high-voltage guide post, a conductive spring, a first insulating support rod, a first metal support rod, a needle electrode and a first translation drive mechanism; the positive electrode of the first DC power supply is connected to one end of the first resistor through a wire, and the other end of the first resistor is connected to the high-voltage guide post through a wire, the high-voltage guide post is horizontally fixedly installed on the first insulating cover, one end of the high-voltage guide post is located outside the metal tank body, and the other end of the high-voltage guide post is located inside the metal tank body; the negative electrode of the first DC power supply is grounded through a wire; the first insulating support rod is coaxially fixed to the first metal support rod The invention relates to a combined support rod, which is horizontally sealed and passes through a first insulating cover. The combined support rod has axial freedom of movement relative to the first insulating cover. One end of the first metal support rod in the combined support rod always extends into the interior of the metal tank body. The needle electrode is vertically fixed to the end of the first metal support rod located inside the metal tank body. One end of the conductive spring sheet is fixed to the end of the high-voltage guide column located inside the metal tank body, and the other end of the conductive spring sheet overlaps and conducts with the first metal support rod. The first translation drive mechanism is located outside the metal tank body, and the first insulating support rod in the combined support rod is connected to the first translation drive mechanism.

[0013] The charge measurement component includes an electrostatic probe, a second insulating support rod and a second translation drive mechanism; the second insulating support rod is horizontally sealed and passes through the second insulating cover, and the second insulating support rod has axial movement freedom relative to the second insulating cover; the electrostatic probe is vertically fixed on the end of the second insulating support rod located inside the metal tank body; the second translation drive mechanism is located outside the metal tank body, and the other end of the second insulating support rod is connected to the second translation drive mechanism.

[0014] The surface flashover assembly includes a second DC power supply, a second resistor, an electrode plate, a second metal support rod, a high-voltage electrode, a lifting drive mechanism, a rotary drive mechanism and a pneumatic control switch; the positive electrode of the second DC power supply is connected to one end of the second resistor through a wire, and the other end of the second resistor is connected to the high-voltage guide rod at the center of the insulator cover through a wire; the second metal support rod vertically seals and passes through the bottom plate of the metal tank body, and the second metal support rod has axial freedom of movement relative to the bottom plate of the metal tank body; the electrode plate is horizontally fixed on the top of the second metal support rod, and the insulating sample piece is horizontally placed on the upper surface of the electrode plate; the high-voltage electrode is horizontally fixed on the bottom of the high-voltage guide rod; the lifting drive mechanism and the rotary drive mechanism are located outside the metal tank body, the rotary drive mechanism is installed on the lifting drive mechanism, and the lower end of the second metal support rod is connected to the rotary drive mechanism; the electrode plate is grounded in turn through the second metal support rod, the metal tank body and the pneumatic control switch.

[0015] The sample piece replacement assembly includes a pneumatic lifting platform, a sample piece enclosure side column, a pneumatic three-jaw chuck, a third insulating support rod, a third translation drive mechanism, a fourth insulating support rod, a sample piece push rod and a fourth translation drive mechanism; the pneumatic lifting platform is vertically installed in the opening where the third insulating cover is located, and insulating sample pieces for replacement are stacked on the upper surface of the pneumatic lifting platform; the sample piece enclosure side columns are evenly distributed along the circumferential direction of the pneumatic lifting platform, and the stacked insulating sample pieces are located on the inner side of the sample piece enclosure side columns; the third insulating support rod horizontally seals and passes through the third insulating cover, and the third insulating support rod has axial freedom of movement relative to the third insulating cover; The pneumatic three-jaw chuck is fixedly mounted on the end of the third insulating support rod located inside the metal tank body, and the pneumatic three-jaw chuck is located above the stacked insulating sample pieces; the third translation drive mechanism is located outside the metal tank body, and the other end of the third insulating support rod is connected to the third translation drive mechanism; the fourth insulating support rod horizontally seals and passes through the fourth insulating cover, and the fourth insulating support rod has axial movement freedom relative to the fourth insulating cover; the sample piece push pin is vertically fixedly mounted on the end of the fourth insulating support rod located inside the metal tank body; the fourth translation drive mechanism is located outside the metal tank body, and the other end of the fourth insulating support rod is connected to the fourth translation drive mechanism.

[0016] An insulating material flashover test method, using the insulating material flashover test device with automatic sample replacement, comprises the following steps:

[0017] Step 1: Remove the third insulating cover from the metal tank body and retreat to the rear end along the third insulating support rod, then start the third translation drive mechanism to drive the third insulating support rod to move to the outside of the metal tank body until the pneumatic three-jaw chuck moves to the outside of the metal tank body, and then stack several insulating sample sheets prepared in advance on the pneumatic lifting platform;

[0018] Step 2: Reversely start the third translation drive mechanism to drive the third insulating support rod to move into the metal tank body until the pneumatic three-jaw chuck moves back into the metal tank body, then move the third insulating cover back to the metal tank body along the third insulating support rod, and re-seal and connect the third insulating cover to the metal tank body;

[0019] Step 3: Start the third translation drive mechanism again to drive the third insulating support rod to continue to move into the metal tank until the pneumatic three-jaw chuck moves to the top of the pneumatic lifting platform;

[0020] Step 4: Start the pneumatic lifting platform to lift the stacked insulation specimens upward until the top insulation specimen enters the clamping range of the pneumatic three-jaw chuck;

[0021] Step 5: Start the pneumatic three-jaw chuck to clamp the top insulation sample piece, and then pneumatically lift the platform again to make the stacked insulation sample pieces fall back to the initial position;

[0022] Step 6: Start the third translation drive mechanism to drive the third insulating support rod to continue to move into the metal tank until the pneumatic three-jaw chuck holding the insulating sample piece moves to just above the electrode plate;

[0023] Step 7: Start the lifting drive mechanism to drive the second metal support rod to move upward until the electrode plate contacts the insulating sample piece, then release the pneumatic three-jaw chuck from clamping the insulating sample piece, so that the insulating sample piece stays on the upper surface of the electrode plate, and then control the electrode plate to move downward to make the insulating sample piece out of the clamping range of the pneumatic three-jaw chuck, and then control the pneumatic three-jaw chuck to return to the top of the pneumatic lifting platform to prepare for the next replacement of the insulating sample piece;

[0024] Step 8: Fill the metal tank with insulating gas through the insulating gas injection port, then close the insulating gas injection port, and start the pneumatic control switch to ground the metal tank;

[0025] Step nine: start the first translation driving mechanism to drive the combined support rod consisting of the first insulating support rod and the first metal support rod to move into the metal tank until the needle electrode is driven to move to the top of the center of the insulating sample piece;

[0026] Step 10: Start the lifting drive mechanism again to drive the second metal support rod to move upward until the insulating sample piece above the electrode plate and the needle electrode reach a set distance;

[0027] Step 11: starting the first DC power supply, applying a voltage between the needle electrode and the electrode plate, and applying the voltage for 10 to 30 minutes until the charge injection on the surface of the insulating sample piece is completed, and then turning off the first DC power supply;

[0028] Step 12: Reversely start the first translation driving mechanism to drive the combined support rod composed of the first insulating support rod and the first metal support rod to move toward the outside of the metal can body until the needle electrode is driven to leave from above the insulating sample piece and move back to the initial position;

[0029] Step 13: Start the second translation drive mechanism to drive the second insulating support rod to move into the metal tank until the electrostatic probe is driven to move to the top of the center of the insulating sample piece;

[0030] Step 14: Reversely start the second translation drive mechanism to drive the electrostatic probe to move from the center of the insulating sample piece to the position of the first inner circle measurement point, then start the rotary drive mechanism to drive the second metal support rod, the electrode plate and the insulating sample piece to rotate synchronously, and complete the charge measurement of the first inner circle measurement point through the electrostatic probe;

[0031] Step 15: Repeat step 14, and complete the charge measurement of all measurement points from the inside to the outside in accordance with the charge measurement process of the first circle of measurement points on the inner side of the insulating sample piece;

[0032] Step 16: After the charge measurement of the first circle of measurement points outside the insulating sample piece is completed, the second translation drive mechanism is started in the reverse direction to drive the second insulating support rod to move toward the outside of the metal tank until the electrostatic probe leaves the insulating sample piece and moves back to the initial position;

[0033] Step 17: Start the lifting drive mechanism to drive the second metal support, the electrode plate and the insulating sample piece to rise synchronously until the insulating sample piece contacts the high-voltage electrode;

[0034] Step 18: Start the second DC power supply and apply voltage to the high voltage electrode until a surface flashover phenomenon occurs;

[0035] Step 19: After the surface flashover experiment is completed, the second DC power supply is turned off, and the lifting drive mechanism is started in reverse to drive the second metal support rod, the electrode plate and the insulating sample piece to descend synchronously, and the insulating sample piece is separated from the high-voltage electrode until the insulating sample piece moves back to the initial position;

[0036] Step 20: Start the fourth translation driving mechanism to drive the fourth insulating support rod to move into the metal tank body. When the sample pusher contacts the edge of the insulating sample, the sample pusher pushes the insulating sample to move until the insulating sample falls from the electrode plate to the bottom of the metal tank body.

[0037] Step 21: Reversely start the fourth translation driving mechanism to drive the fourth insulating support rod to move toward the outside of the metal can body until the sample pusher leaves the electrode plate and moves back to the initial position;

[0038] Step 22: Repeat steps 4 to 7 to complete the replacement of the insulating sample piece;

[0039] Step 23: Repeat steps 9 to 21 to complete the surface flashover test on the replaced insulation specimen.

[0040] Beneficial effects of the present invention:

[0041] The insulating material flashover experimental device and method for automatically replacing sample pieces of the present invention can realize automatic replacement of insulating sample pieces in the device. During the automatic replacement of insulating sample pieces, there is no need to unseal the device, thus eliminating the manual operation process of unsealing the device, replacing the sample pieces, and resealing the device in the traditional way, greatly saving the time for replacing the insulating sample pieces, effectively shortening the experimental cycle, and further improving the experimental efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of an insulating material flashover experimental device (specimen installation) for automatically replacing specimens of the present invention;

[0043] Figure 2 It is a structural schematic diagram of an insulating material flashover experimental device (charge injection) for automatically replacing a sample piece according to the present invention;

[0044] Figure 3 It is a structural schematic diagram of an insulating material flashover experimental device (charge measurement) for automatically replacing sample pieces of the present invention;

[0045] Figure 4 It is a structural schematic diagram of an insulating material flashover experimental device (surface flashover) for automatically replacing sample pieces of the present invention;

[0046] Figure 5 It is a structural schematic diagram of an insulating material flashover experimental device (specimen removal) for automatically replacing a specimen of the present invention;

[0047] In the figure, 1 is a metal tank, 2 is an insulator cover, 3 is an insulating sample piece, 4 is a first insulating cover, 5 is a second insulating cover, 6 is an observation window, 7 is a third insulating cover, 8 is a fourth insulating cover, 9 is a high-voltage guide rod, 10 is an insulating gas injection port, 11 is a first DC power supply, 12 is a first resistor, 13 is a high-voltage guide column, 14 is a conductive spring sheet, 15 is a first insulating support rod, 16 is a first metal support rod, 17 is a needle electrode, 18 is a first translation drive mechanism, 19 is an electrostatic probe, 20 is a second Insulating support rod, 21—second translation drive mechanism, 22—second DC power supply, 23—second resistor, 24—electrode plate, 25—second metal support rod, 26—high voltage electrode, 27—lifting drive mechanism, 28—rotational drive mechanism, 29—pneumatic control switch, 30—pneumatic lifting platform, 31—specimen piece enclosure side column, 32—pneumatic three-jaw chuck, 33—third insulating support rod, 34—third translation drive mechanism, 35—fourth insulating support rod, 36—specimen piece push pin, 37—fourth translation drive mechanism. DETAILED DESCRIPTION

[0048] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] like Figures 1 to 5As shown, an insulating material flashover experimental device for automatically replacing sample pieces comprises a metal tank body 1, an insulator upper cover 2, an insulating sample piece 3, a charge injection component, a charge measurement component, a surface flashover component and a sample piece replacement component; the sealing buckle of the insulator upper cover 2 is installed at the upper tank mouth of the metal tank body 1, and three openings are provided along the circumferential direction in the middle of the side plate of the metal tank body 1, and the first insulating cover 4, the second insulating cover 5 and the observation window 6 are fixedly installed on the three openings, and the first insulating cover 4 and the second insulating cover 5 are arranged opposite to each other; two openings are provided along the circumferential direction at the lower part of the side plate of the metal tank body 1, and the second insulating cover 5 and the observation window 6 are fixedly installed on the two openings There are three insulating covers 7 and a fourth insulating cover 8, and the third insulating cover 7 and the fourth insulating cover 8 are arranged opposite to each other; the first insulating cover 4 is used to fit the charge injection component; the second insulating cover 5 is used to fit the charge measurement component; a high-voltage conductor 9 is vertically fixed at the center of the insulator upper cover 2; the surface flashover component is fitted between the high-voltage conductor 9 and the bottom plate of the metal tank body 1, and an insulating gas injection port 10 is provided on the bottom plate of the metal tank body 1, and the metal tank body 1 is grounded through a wire; the sample piece replacement component is assembled between the third insulating cover 7 and the fourth insulating cover 8; the insulating sample piece 3 is located inside the metal tank body 1.

[0050] The insulating sample piece 3 has a circular structure, and a plurality of measuring points are marked on the upper surface of the insulating sample piece 3 .

[0051] The measuring points are distributed in multiple circles along the radial direction relative to the center of the insulating sample piece 3, and the measuring points on each circle are distributed at equal intervals along the circumferential direction.

[0052] The charge injection assembly includes a first DC power supply 11, a first resistor 12, a high-voltage guide post 13, a conductive spring 14, a first insulating support rod 15, a first metal support rod 16, a needle electrode 17 and a first translation drive mechanism 18; the positive electrode of the first DC power supply 11 is connected to one end of the first resistor 12 through a wire, and the other end of the first resistor 12 is connected to the high-voltage guide post 13 through a wire, the high-voltage guide post 13 is horizontally fixedly installed on the first insulating cover 4, one end of the high-voltage guide post 13 is located outside the metal tank body 1, and the other end of the high-voltage guide post 13 is located inside the metal tank body 1; the negative electrode of the first DC power supply 11 is grounded through a wire; the first insulating support rod 15 and the first metal support rod 16 are connected to the first metal support rod 17; the positive electrode of the first DC power supply 11 is connected to the first metal support rod 17 through a wire ... The rod 16 is coaxially fixed to form a combined support rod, which is horizontally sealed and passes through the first insulating cover 4. The combined support rod has axial freedom of movement relative to the first insulating cover 4, and one end of the first metal support rod 16 in the combined support rod always extends into the interior of the metal tank body 1; the needle electrode 17 is vertically fixed to the end of the first metal support rod 16 located inside the metal tank body 1; one end of the conductive spring sheet 14 is fixed to the end of the high-voltage guide column 13 located inside the metal tank body 1, and the other end of the conductive spring sheet 14 overlaps and conducts with the first metal support rod 16; the first translation drive mechanism 18 is located outside the metal tank body 1, and the first insulating support rod 15 in the combined support rod is connected to the first translation drive mechanism 18.

[0053] The charge measurement component includes an electrostatic probe 19, a second insulating support rod 20 and a second translation drive mechanism 21; the second insulating support rod 20 is horizontally sealed and passes through the second insulating cover 5, and the second insulating support rod 20 has axial movement freedom relative to the second insulating cover 5; the electrostatic probe 19 is vertically fixed on the end of the second insulating support rod 20 located inside the metal tank body 1; the second translation drive mechanism 21 is located outside the metal tank body 1, and the other end of the second insulating support rod 20 is connected to the second translation drive mechanism 21.

[0054] The surface flashover assembly comprises a second DC power supply 22, a second resistor 23, an electrode plate 24, a second metal support rod 25, a high-voltage electrode 26, a lifting drive mechanism 27, a rotary drive mechanism 28 and a pneumatic control switch 29; the positive electrode of the second DC power supply 22 is connected to one end of the second resistor 23 through a wire, and the other end of the second resistor 23 is connected to the high-voltage guide rod 9 at the center of the insulator upper cover 2 through a wire; the second metal support rod 25 vertically seals and passes through the bottom plate of the metal tank body 1, and the second metal support rod 25 has an axial movement relative to the bottom plate of the metal tank body 1 degrees of freedom; the electrode plate 24 is horizontally fixed on the top of the second metal support rod 25, and the insulating sample piece 3 is horizontally placed on the upper surface of the electrode plate 24; the high-voltage electrode 26 is horizontally fixed on the bottom of the high-voltage guide rod 9; the lifting drive mechanism 27 and the rotary drive mechanism 28 are located outside the metal tank body 1, the rotary drive mechanism 28 is installed on the lifting drive mechanism 27, and the lower end of the second metal support rod 25 is connected to the rotary drive mechanism 28; the electrode plate 24 is grounded through the second metal support rod 25, the metal tank body 1 and the pneumatic control switch 29 in sequence.

[0055] The sample piece replacement assembly includes a pneumatic lifting platform 30, a sample piece enclosure side column 31, a pneumatic three-jaw chuck 32, a third insulating support rod 33, a third translation drive mechanism 34, a fourth insulating support rod 35, a sample piece push pin 36 and a fourth translation drive mechanism 37; the pneumatic lifting platform 30 is vertically installed in the opening where the third insulating cover 7 is located, and insulating sample pieces 3 for replacement are stacked on the upper surface of the pneumatic lifting platform 30; the sample piece enclosure side column 31 is evenly distributed along the circumferential direction of the pneumatic lifting platform 30, and the stacked insulating sample pieces 3 are located on the inner side of the sample piece enclosure side column 31; the third insulating support rod 33 horizontally seals and passes through the third insulating cover 7, and the third insulating support rod 33 has axial movement freedom relative to the third insulating cover 7 ; The pneumatic three-jaw chuck 32 is fixedly mounted on the end of the third insulating support rod 33 located inside the metal tank body 1, and the pneumatic three-jaw chuck 32 is located above the stacked insulating sample pieces 3; the third translation drive mechanism 34 is located outside the metal tank body 1, and the other end of the third insulating support rod 33 is connected to the third translation drive mechanism 34; the fourth insulating support rod 35 horizontally seals and passes through the fourth insulating cover 8, and the fourth insulating support rod 35 has axial movement freedom relative to the fourth insulating cover 8; the sample piece push pin 36 is vertically fixedly mounted on the end of the fourth insulating support rod 35 located inside the metal tank body 1; the fourth translation drive mechanism 37 is located outside the metal tank body 1, and the other end of the fourth insulating support rod 35 is connected to the fourth translation drive mechanism 37.

[0056] In this embodiment, the first translation drive mechanism 18, the second translation drive mechanism 21, the third translation drive mechanism 34, the fourth translation drive mechanism 37 and the lifting drive mechanism 27 all adopt motor-driven nut slider guide mechanisms, and the rotary drive mechanism 28 directly adopts an electric motor; a total of 29 circles of measuring points are arranged on the upper surface of the insulating sample piece 3, and the number of measuring points on each circle is 80, so that the total number of measuring points on the upper surface of the insulating sample piece 3 is 2320.

[0057] An insulating material flashover test method, using the insulating material flashover test device with automatic sample replacement, comprises the following steps:

[0058] Step 1: Remove the third insulating cover 7 from the metal can body 1 and retreat to the rear end along the third insulating support rod 33, then start the third translation drive mechanism 34 to drive the third insulating support rod 33 to move outside the metal can body 1 until the pneumatic three-jaw chuck 32 moves to the outside of the metal can body 1, and then stack several insulating sample sheets 3 prepared in advance on the pneumatic lifting platform 30;

[0059] Step 2: Reversely start the third translation driving mechanism 34 to drive the third insulating support rod 33 to move into the metal can body 1 until the pneumatic three-jaw chuck 32 moves back into the metal can body 1, then move the third insulating cover 7 back to the metal can body 1 along the third insulating support rod 33, and re-seal and connect the third insulating cover 7 to the metal can body 1;

[0060] Step 3: Start the third translation drive mechanism 34 again, driving the third insulating support rod 33 to continue to move into the metal can body 1 until the pneumatic three-jaw chuck 32 moves to the top of the pneumatic lifting platform 30;

[0061] Step 4: Start the pneumatic lifting platform 30 to lift the stacked insulation sample pieces 3 upwards until the top insulation sample piece 3 enters the clamping range of the pneumatic three-jaw chuck 32;

[0062] Step 5: Start the pneumatic three-jaw chuck 32 to clamp the top insulating sample piece 3, and then pneumatically lift the platform 30 again to make the stacked insulating sample pieces 3 fall back to the initial position;

[0063] Step 6: Start the third translation drive mechanism 34 to drive the third insulating support rod 33 to continue to move into the metal can body 1 until the pneumatic three-jaw chuck 32 holding the insulating sample piece 3 moves to the top of the electrode plate 24;

[0064] Step 7: Start the lifting drive mechanism 27 to drive the second metal support rod 25 to move upward until the electrode plate 24 contacts the insulating sample piece 3, then release the pneumatic three-jaw chuck 32 from clamping the insulating sample piece 3, so that the insulating sample piece 3 stays on the upper surface of the electrode plate 24, and then control the electrode plate 24 to move downward to make the insulating sample piece 3 escape from the clamping range of the pneumatic three-jaw chuck 32, and then control the pneumatic three-jaw chuck 32 to retreat to the top of the pneumatic lifting platform 30, in preparation for the next replacement of the insulating sample piece 3;

[0065] Step 8: Insulating gas is filled into the metal tank body 1 through the insulating gas injection port 10, and then the insulating gas injection port 10 is closed, and the pneumatic control switch 29 is started at the same time to ground the metal tank body 1;

[0066] Step nine: start the first translation driving mechanism 18 to drive the combined support rod composed of the first insulating support rod 15 and the first metal support rod 16 to move into the metal can body 1 until the needle electrode 17 is driven to move to the center of the insulating sample piece 3;

[0067] Step 10: Start the lifting drive mechanism 27 again to drive the second metal support rod 25 to move upward until the insulating sample piece 3 above the electrode plate 24 and the needle electrode 17 reach a set distance;

[0068] Step 11: Start the first DC power supply 11, apply voltage between the needle electrode 17 and the electrode plate 24, and apply the voltage for 10 to 30 minutes until the charge injection is completed on the surface of the insulating sample piece 3, and then turn off the first DC power supply 11;

[0069] Step 12: Reversely start the first translation driving mechanism 18 to drive the combined support rod composed of the first insulating support rod 15 and the first metal support rod 16 to move toward the outside of the metal can body 1, until the needle electrode 17 is driven to leave from above the insulating sample piece 3 and move back to the initial position;

[0070] Step 13: Start the second translation driving mechanism 21 to drive the second insulating support rod 20 to move into the metal can body 1 until the electrostatic probe 19 is driven to move to the center of the insulating sample piece 3;

[0071] Step 14: Reversely start the second translation drive mechanism 21 to drive the electrostatic probe 19 to move from the center of the insulating sample piece 3 to the position of the first inner circle measurement point, then start the rotary drive mechanism 28 to drive the second metal support rod 25, the electrode plate 24 and the insulating sample piece 3 to rotate synchronously, and complete the charge measurement of the first inner circle measurement point through the electrostatic probe 19;

[0072] Step 15: Repeat step 14, and complete the charge measurement of all measurement points from the inside to the outside in accordance with the charge measurement process of the first circle of measurement points on the inner side of the insulating sample piece 3;

[0073] Step 16: After the charge measurement of the first circle of measurement points outside the insulating sample piece 3 is completed, the second translation drive mechanism 21 is started in the reverse direction to drive the second insulating support rod 20 to move outside the metal can body 1 until the electrostatic probe 19 leaves the insulating sample piece 3 and moves back to the initial position;

[0074] Step 17: Start the lifting drive mechanism 27 to drive the second metal support 25, the electrode plate 24 and the insulating sample piece 3 to rise synchronously until the insulating sample piece 3 contacts the high voltage electrode 26;

[0075] Step 18: Start the second DC power supply 22 and apply voltage to the high voltage electrode 26 until a surface flashover phenomenon occurs;

[0076] Step 19: After the surface flashover experiment is completed, the second DC power supply 22 is turned off, and the lifting drive mechanism 27 is reversely started to drive the second metal support rod 25, the electrode plate 24 and the insulating sample piece 3 to descend synchronously, and the insulating sample piece 3 is separated from the high-voltage electrode 26 until the insulating sample piece 3 moves back to the initial position;

[0077] Step 20: Start the fourth translation driving mechanism 37 to drive the fourth insulating support rod 35 to move into the metal can body 1. When the sample pusher 36 contacts the edge of the insulating sample piece 3, the sample pusher 36 will push the insulating sample piece 3 to move until the insulating sample piece 3 falls from the electrode plate 24 to the bottom of the metal can body 1.

[0078] Step 21: Reversely start the fourth translation driving mechanism 37 to drive the fourth insulating support rod 35 to move toward the outside of the metal can body 1 until the sample pusher 36 leaves the electrode plate 24 and moves back to the initial position;

[0079] Step 22: Repeat steps 4 to 7 to complete the replacement of the insulating sample piece 3;

[0080] Step 23: Repeat steps 9 to 21 to complete the surface flashover test on the replaced insulating sample piece 3.

[0081] The solutions in the embodiments are not intended to limit the protection scope of the present invention. All equivalent implementations or changes that do not deviate from the present invention are included in the protection scope of the present invention.

Claims

1. An insulating material flashover test device with automatic replacement of sample pieces, characterized in that: The invention comprises a metal tank body, an insulator upper cover, an insulating sample piece, a charge injection component, a charge measurement component, a surface flashover component and a sample piece replacement component; the sealing buckle of the insulator upper cover is installed at the upper tank mouth of the metal tank body, three openings are arranged along the circumferential direction in the middle of the side plate of the metal tank body, and the first insulating cover, the second insulating cover and the observation window are fixedly installed on the three openings, and the first insulating cover and the second insulating cover are arranged opposite to each other; two openings are arranged along the circumferential direction at the lower part of the side plate of the metal tank body, and the third insulating cover and the fourth insulating cover are fixedly installed on the two openings The third insulating cover and the fourth insulating cover are arranged opposite to each other; the first insulating cover is used to equip the charge injection component; the second insulating cover is used to equip the charge measurement component; a high-voltage conductor is vertically fixed at the center of the insulator upper cover; the surface flashover component is installed between the high-voltage conductor and the bottom plate of the metal tank body, an insulating gas injection port is provided on the bottom plate of the metal tank body, and the metal tank body is grounded through a wire; the sample piece replacement component is assembled between the third insulating cover and the fourth insulating cover; the insulating sample piece is located inside the metal tank body.

2. The insulating material flashover test device for automatically replacing the sample piece according to claim 1 is characterized in that: The insulating sample piece adopts a circular structure, and a plurality of measuring points are marked on the upper surface of the insulating sample piece.

3. The insulating material flashover test device for automatically replacing the sample piece according to claim 2, characterized in that: The measuring points are distributed in a plurality of circles along the radial direction relative to the center of the insulating sample piece, and the measuring points on each circle are distributed at equal intervals along the circumferential direction.

4. The insulating material flashover test device for automatically replacing the sample piece according to claim 1, characterized in that: The charge injection assembly includes a first DC power supply, a first resistor, a high-voltage guide post, a conductive spring, a first insulating support rod, a first metal support rod, a needle electrode and a first translation drive mechanism; the positive electrode of the first DC power supply is connected to one end of the first resistor through a wire, and the other end of the first resistor is connected to the high-voltage guide post through a wire, the high-voltage guide post is horizontally fixedly installed on the first insulating cover, one end of the high-voltage guide post is located outside the metal tank body, and the other end of the high-voltage guide post is located inside the metal tank body; the negative electrode of the first DC power supply is grounded through a wire; the first insulating support rod is coaxially fixed to the first metal support rod The invention relates to a combined support rod, which is horizontally sealed and passes through a first insulating cover. The combined support rod has axial freedom of movement relative to the first insulating cover. One end of the first metal support rod in the combined support rod always extends into the interior of the metal tank body. The needle electrode is vertically fixed to the end of the first metal support rod located inside the metal tank body. One end of the conductive spring sheet is fixed to the end of the high-voltage guide column located inside the metal tank body, and the other end of the conductive spring sheet overlaps and conducts with the first metal support rod. The first translation drive mechanism is located outside the metal tank body, and the first insulating support rod in the combined support rod is connected to the first translation drive mechanism.

5. The insulating material flashover test device for automatically replacing the sample piece according to claim 1, characterized in that: The charge measurement component includes an electrostatic probe, a second insulating support rod and a second translation drive mechanism; the second insulating support rod is horizontally sealed and passes through the second insulating cover, and the second insulating support rod has axial movement freedom relative to the second insulating cover; the electrostatic probe is vertically fixed on the end of the second insulating support rod located inside the metal tank body; the second translation drive mechanism is located outside the metal tank body, and the other end of the second insulating support rod is connected to the second translation drive mechanism.

6. The insulating material flashover test device for automatically replacing the sample piece according to claim 1, characterized in that: The surface flashover assembly includes a second DC power supply, a second resistor, an electrode plate, a second metal support rod, a high-voltage electrode, a lifting drive mechanism, a rotary drive mechanism and a pneumatic control switch; the positive electrode of the second DC power supply is connected to one end of the second resistor through a wire, and the other end of the second resistor is connected to the high-voltage guide rod at the center of the insulator cover through a wire; the second metal support rod vertically seals and passes through the bottom plate of the metal tank body, and the second metal support rod has axial freedom of movement relative to the bottom plate of the metal tank body; the electrode plate is horizontally fixed on the top of the second metal support rod, and the insulating sample piece is horizontally placed on the upper surface of the electrode plate; the high-voltage electrode is horizontally fixed on the bottom of the high-voltage guide rod; the lifting drive mechanism and the rotary drive mechanism are located outside the metal tank body, the rotary drive mechanism is installed on the lifting drive mechanism, and the lower end of the second metal support rod is connected to the rotary drive mechanism; the electrode plate is grounded in turn through the second metal support rod, the metal tank body and the pneumatic control switch.

7. The insulating material flashover test device for automatically replacing the sample piece according to claim 1, characterized in that: The sample piece replacement assembly includes a pneumatic lifting platform, a sample piece enclosure side column, a pneumatic three-jaw chuck, a third insulating support rod, a third translation drive mechanism, a fourth insulating support rod, a sample piece push rod and a fourth translation drive mechanism; the pneumatic lifting platform is vertically installed in the opening where the third insulating cover is located, and insulating sample pieces for replacement are stacked on the upper surface of the pneumatic lifting platform; the sample piece enclosure side columns are evenly distributed along the circumferential direction of the pneumatic lifting platform, and the stacked insulating sample pieces are located on the inner side of the sample piece enclosure side columns; the third insulating support rod horizontally seals and passes through the third insulating cover, and the third insulating support rod has axial freedom of movement relative to the third insulating cover; The pneumatic three-jaw chuck is fixedly mounted on the end of the third insulating support rod located inside the metal tank body, and the pneumatic three-jaw chuck is located above the stacked insulating sample pieces; the third translation drive mechanism is located outside the metal tank body, and the other end of the third insulating support rod is connected to the third translation drive mechanism; the fourth insulating support rod horizontally seals and passes through the fourth insulating cover, and the fourth insulating support rod has axial movement freedom relative to the fourth insulating cover; the sample piece push pin is vertically fixedly mounted on the end of the fourth insulating support rod located inside the metal tank body; the fourth translation drive mechanism is located outside the metal tank body, and the other end of the fourth insulating support rod is connected to the fourth translation drive mechanism.

8. An insulating material flashover test method, using the insulating material flashover test device with automatic specimen replacement according to claim 1, characterized in that: The steps include: Step 1: Remove the third insulating cover from the metal tank body and retreat to the rear end along the third insulating support rod, then start the third translation drive mechanism to drive the third insulating support rod to move to the outside of the metal tank body until the pneumatic three-jaw chuck moves to the outside of the metal tank body, and then stack several insulating sample sheets prepared in advance on the pneumatic lifting platform; Step 2: Reversely start the third translation drive mechanism to drive the third insulating support rod to move into the metal tank body until the pneumatic three-jaw chuck moves back into the metal tank body, then move the third insulating cover back to the metal tank body along the third insulating support rod, and re-seal and connect the third insulating cover to the metal tank body; Step 3: Start the third translation drive mechanism again to drive the third insulating support rod to continue to move into the metal tank until the pneumatic three-jaw chuck moves to the top of the pneumatic lifting platform; Step 4: Start the pneumatic lifting platform to lift the stacked insulation specimens upward until the top insulation specimen enters the clamping range of the pneumatic three-jaw chuck; Step 5: Start the pneumatic three-jaw chuck to clamp the top insulation sample piece, and then pneumatically lift the platform again to make the stacked insulation sample pieces fall back to the initial position; Step 6: Start the third translation drive mechanism to drive the third insulating support rod to continue to move into the metal tank until the pneumatic three-jaw chuck holding the insulating sample piece moves to just above the electrode plate; Step 7: Start the lifting drive mechanism to drive the second metal support rod to move upward until the electrode plate contacts the insulating sample piece, then release the pneumatic three-jaw chuck from clamping the insulating sample piece, so that the insulating sample piece stays on the upper surface of the electrode plate, and then control the electrode plate to move downward to make the insulating sample piece out of the clamping range of the pneumatic three-jaw chuck, and then control the pneumatic three-jaw chuck to return to the top of the pneumatic lifting platform to prepare for the next replacement of the insulating sample piece; Step 8: Fill the metal tank with insulating gas through the insulating gas injection port, then close the insulating gas injection port, and start the pneumatic control switch to ground the metal tank; Step nine: start the first translation driving mechanism to drive the combined support rod consisting of the first insulating support rod and the first metal support rod to move into the metal tank until the needle electrode is driven to move to the top of the center of the insulating sample piece; Step 10: Start the lifting drive mechanism again to drive the second metal support rod to move upward until the insulating sample piece above the electrode plate and the needle electrode reach a set distance; Step 11: starting the first DC power supply, applying a voltage between the needle electrode and the electrode plate, and applying the voltage for 10 to 30 minutes until the charge injection on the surface of the insulating sample piece is completed, and then turning off the first DC power supply; Step 12: Reversely start the first translation driving mechanism to drive the combined support rod composed of the first insulating support rod and the first metal support rod to move toward the outside of the metal can body until the needle electrode is driven to leave from above the insulating sample piece and move back to the initial position; Step 13: Start the second translation drive mechanism to drive the second insulating support rod to move into the metal tank until the electrostatic probe is driven to move to the top of the center of the insulating sample piece; Step 14: Reversely start the second translation drive mechanism to drive the electrostatic probe to move from the center of the insulating sample piece to the position of the first inner circle measurement point, then start the rotary drive mechanism to drive the second metal support rod, the electrode plate and the insulating sample piece to rotate synchronously, and complete the charge measurement of the first inner circle measurement point through the electrostatic probe; Step 15: Repeat step 14, and complete the charge measurement of all measurement points from the inside to the outside in accordance with the charge measurement process of the first circle of measurement points on the inner side of the insulating sample piece; Step 16: After the charge measurement of the first circle of measurement points outside the insulating sample piece is completed, the second translation drive mechanism is started in the reverse direction to drive the second insulating support rod to move toward the outside of the metal tank until the electrostatic probe leaves the insulating sample piece and moves back to the initial position; Step 17: Start the lifting drive mechanism to drive the second metal support, the electrode plate and the insulating sample piece to rise synchronously until the insulating sample piece contacts the high-voltage electrode; Step 18: Start the second DC power supply and apply voltage to the high voltage electrode until a surface flashover phenomenon occurs; Step 19: After the surface flashover experiment is completed, the second DC power supply is turned off, and the lifting drive mechanism is started in reverse to drive the second metal support rod, the electrode plate and the insulating sample piece to descend synchronously, and the insulating sample piece is separated from the high-voltage electrode until the insulating sample piece moves back to the initial position; Step 20: Start the fourth translation driving mechanism to drive the fourth insulating support rod to move into the metal tank body. When the sample pusher contacts the edge of the insulating sample, the sample pusher pushes the insulating sample to move until the insulating sample falls from the electrode plate to the bottom of the metal tank body. Step 21: Reversely start the fourth translation driving mechanism to drive the fourth insulating support rod to move toward the outside of the metal can body until the sample pusher leaves the electrode plate and moves back to the initial position; Step 22: Repeat steps 4 to 7 to complete the replacement of the insulating sample piece; Step 23: Repeat steps 9 to 21 to complete the surface flashover test on the replaced insulation specimen.

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