A surface insulation measurement device considering the influence of foreign matter

Abstract

The invention relates to the technical field of electrical insulation detection, and in particular to a surface insulation measurement device taking into account the influence of foreign matter, comprising a closed laboratory in a negative pressure state, a particle adding module, a voltage detection module, a test sample and a heating module; the closed laboratory is provided with a particle entry channel and a gas channel; the particle adding module comprises an outer shell, a middle shell and an inner push rod which are slidably connected in sequence, and a particle groove is arranged on the middle shell; the voltage detection module comprises a high-voltage guide rod, a grounding guide rod, a high-voltage electrode, and a low-voltage electrode; the test sample is clamped between the high-voltage electrode and the low-voltage electrode; the heating module is arranged in the closed laboratory; the invention is used to overcome the problem that the prior art cannot flexibly add particles and change the particle concentration. The invention can effectively send foreign particles into the closed test cavity, so that the particles are naturally attached to the solid surface, and the accuracy of measuring the flashover characteristics of the insulating structure surface under different particle concentrations is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical insulation detection, and in particular to a surface insulation measurement device taking into account the influence of foreign matter. Background Art

[0002] Gas-insulated power transmission and transformation equipment is widely used in power systems. Metal or non-metallic particles will inevitably enter the equipment and accumulate during operation, and adhere to the surface of the solid insulation structure inside the gas-insulated power transmission and transformation equipment, causing flashover discharge and equipment shutdown, resulting in huge economic losses. Therefore, it is very important to study the influence of metal or non-metallic particles on the flashover characteristics of the surface of the solid insulation structure under high pressure, high voltage and airflow.

[0003] At present, in many studies on the influence of foreign particles on the insulation properties of solid insulation structures, the particles are generally placed on the surface of the material or inside the cavity in advance, and the influence of the particles on the insulation failure characteristics of the material is observed by changing conditions such as time and voltage. However, when studying the surface insulation characteristics of foreign particles in the electric-thermal-fluid multi-physical field, it is impossible to flexibly add particles in a closed experimental cavity and change the concentration of particles, so it is impossible to reliably measure the flashover characteristics of solid insulation structures under different particle concentrations. Summary of the invention

[0004] In order to overcome the defects in the above-mentioned prior art, the present invention provides a surface insulation measurement device that takes the influence of foreign matter into consideration, which can effectively deliver a certain amount of foreign matter particles into a closed test cavity, and allow the particles to naturally adhere to the surface of the solid insulation structure, thereby improving the accuracy of measuring the flashover characteristics of the solid insulation structure surface at different particle concentrations.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a surface insulation measurement device considering the influence of foreign matter, comprising a closed laboratory in a negative pressure state, a particle adding module, a voltage detection module, a test sample, and a heating module;

[0006] The closed laboratory is provided with a particle inlet channel and a gas channel, the particle inlet channel is provided with a first valve, and the gas channel is provided with a second valve;

[0007] The particle adding module comprises an outer shell, a middle shell, and an internal push rod, the outer shell is connected to the particle inlet channel, the middle shell is slidably connected in the outer shell, the internal push rod is slidably connected in the middle shell, a particle groove is arranged on the end of the middle shell installed in the outer shell, and an openable and closable particle injection port and an openable and closable exhaust port are arranged on the outer shell;

[0008] The voltage detection module comprises a high-voltage rod, a grounding rod, a high-voltage electrode and a low-voltage electrode; the high-voltage rod and the grounding rod are respectively fixed on two opposite inner walls of the closed laboratory, the high-voltage electrode is installed at the free end of the high-voltage rod, the low-voltage electrode is installed at the free end of the grounding rod, and the grounding rod is grounded;

[0009] The test sample is clamped between the high voltage electrode and the low voltage electrode;

[0010] The heating module is arranged in the closed laboratory.

[0011] Furthermore, the high-voltage conductor rod and the ground conductor rod are respectively covered with insulating protective sleeves.

[0012] Furthermore, dynamic sealing structures are provided between the outer shell and the middle shell, and between the middle shell and the inner push rod, respectively.

[0013] Furthermore, a push block is provided at one end of the internal push rod close to the particle groove.

[0014] Furthermore, a handle is provided at the other end of the inner push rod.

[0015] Furthermore, a distance adjustment device is provided between the inner wall of the closed laboratory and the grounding rod.

[0016] Furthermore, the distance adjusting device is a spring.

[0017] Furthermore, the closed laboratory is provided with an observation window.

[0018] Furthermore, the temperature adjustment range of the heating module is 20 degrees to 150 degrees.

[0019] Furthermore, the heating module is a ceramic heating ring.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a surface insulation measurement device taking into account the influence of foreign matter, comprising a closed laboratory in a negative pressure state, a particle adding module, a voltage detection module, a test sample, and a heating module; the closed laboratory is provided with a particle entry channel and a gas channel, the particle entry channel is provided with a first valve, and the gas channel is provided with a second valve; the particle adding module comprises an outer shell, a middle shell, and an internal push rod with increasing lengths in sequence, the outer shell is connected to the particle entry channel, the middle shell is slidably connected in the outer shell, the internal push rod is slidably connected in the middle shell, and the middle shell is connected to the particle entry channel. The inner shell is installed in the end of the outer shell and is provided with a particle groove, and the outer shell is provided with an openable and closable particle injection port and an openable and closable exhaust port; the voltage detection module includes a high-voltage guide rod, a grounding guide rod, a high-voltage electrode and a low-voltage electrode; the high-voltage guide rod and the grounding guide rod are respectively fixed on two opposite inner walls of the closed laboratory, the high-voltage electrode is installed at the free end of the high-voltage guide rod, the low-voltage electrode is installed at the free end of the grounding guide rod, and the grounding guide rod is grounded; the test sample is clamped between the high-voltage electrode and the low-voltage electrode; the heating module is arranged in the closed laboratory;

[0022] When in use, close the first valve, set the closed laboratory to a sealed state, connect an external vacuum device to the gas channel, and use the vacuum device to pump the inside of the closed laboratory to a negative pressure state; pull the inner shell to make the inner shell slide inside the outer shell, align the particle groove set on the inner shell with the particle injection port on the outer shell, open the particle injection port to add particles into the particle groove, and close the particle injection port; and connect an external vacuum device to the exhaust port set on the outer shell of the particle adding module, so that the pressure inside the outer shell is the same as the pressure inside the closed laboratory; open the first valve, push the inner shell, and push the particle groove to the particle entry channel and the closed laboratory. At the connection port, the internal push rod is pushed again, so that the internal push rod pushes the foreign particles contained in the particle tank into the closed laboratory; the heating module controls the temperature in the closed laboratory, so that the heat distribution inside the closed laboratory is uneven, thereby forming a convection environment. When the internal push rod pushes the foreign particles into the closed laboratory, the particles are dispersed in the closed laboratory and follow the convection annular flow to form a controlled motion and attach to the test sample, so that the concentration of particles attached to the test sample can be flexibly controlled; a high-voltage power supply is externally connected to the high-voltage guide rod, and the flashover voltage of the test sample is measured using the formed detection circuit, so as to obtain the flashover characteristics of the test sample under different particle concentrations;

[0023] The present invention utilizes a particle adding module to add particle foreign matter into a closed laboratory, and a heating module is arranged in the closed laboratory, and a convection environment is formed in the closed laboratory by utilizing the heat distribution characteristics, so that the movement of particles is controlled, thereby controlling the concentration of particles attached to the test sample, realizing flexible addition of particles, changing the concentration of particles attached to the test sample, thereby obtaining reliable measurement data, simple operation, and accurate measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attached Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure numerals: 1-enclosed laboratory; 2-external shell; 3-middle shell; 4-internal push rod; 5-particle slot; 6-particle injection port; 7-exhaust port; 8-first valve; 9-second valve; 10-high-voltage guide rod; 11-grounding guide rod; 12-high-voltage electrode; 13-low-voltage electrode; 14-test sample; 15-insulating protective cover; 16-heating module; 17-dynamic sealing structure; 18-push block; 19-handle; 20-distance adjustment device; 21-observation window. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The present invention is described in one of the embodiments in combination with the specific implementation methods. Among them, the drawings are only used for exemplary descriptions, and only schematic diagrams are shown, not physical drawings, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0027] Example

[0028] like Figure 1 As shown, this embodiment provides a surface insulation measurement device considering the influence of foreign matter, including a closed laboratory 1 in a negative pressure state, a particle adding module, a voltage detection module, a test sample, and a heating module 16;

[0029] The closed laboratory 1 is provided with a particle inlet channel and a gas channel, the particle inlet channel is provided with a first valve 8, and the gas channel is provided with a second valve 9;

[0030] The particle adding module comprises an outer shell 2, a middle shell 3, and an internal push rod 4, the lengths of which increase successively. The outer shell 2 is connected to the particle inlet channel, the middle shell 3 is slidably connected in the outer shell 2, the internal push rod 4 is slidably connected in the middle shell 3, a particle slot 5 is arranged on the end of the middle shell 3 installed in the outer shell 2, and an openable and closable particle injection port 6 and an openable and closable exhaust port 7 are arranged on the outer shell 2;

[0031] The voltage detection module includes a high-voltage conductor rod 10, a ground conductor rod 11, a high-voltage electrode 12 and a low-voltage electrode 13; the high-voltage conductor rod 10 and the ground conductor rod 11 are respectively fixed on two opposite inner walls of the closed laboratory 1, the high-voltage electrode 12 is installed at the free end of the high-voltage conductor rod 10, the low-voltage electrode 13 is installed at the free end of the ground conductor rod 11, and the ground conductor rod 11 is grounded;

[0032] The test sample is clamped between the high voltage electrode 12 and the low voltage electrode 13;

[0033] The heating module 16 is arranged in the closed laboratory 1;

[0034] It should be noted that when the first valve 8 and the second valve 9 are closed, the interior of the closed laboratory 1 is in a sealed state, and the second valve 9 is opened, and an external exhaust device is connected to the gas channel to extract the internal gas of the closed laboratory 1 to form a negative pressure state, wherein the internal gas pressure of the closed laboratory 1 is preferably set to -0.1 to 0.6 MPa to prevent other impurities from affecting the measurement;

[0035] The particle adding module is used to add particle foreign matter into the closed laboratory 1 to form different particle concentration conditions, wherein the particle adding module is a three-layer coaxial telescopic mechanism, including an outer shell 2, a middle shell 3 and an internal push rod 4, the outer shell 2 is a metal shell, used to isolate the particles contained in the particle slot 5 from the external environment, the middle shell 3 is used to connect with the particle slot 5 containing the particle foreign matter, and the internal push rod 4 is used to push the particle foreign matter in the particle slot 5 into the closed laboratory 1, and the length of the outer shell 2, the length of the middle shell 3 and the length of the internal push rod 4 increase in sequence, that is, one end of the middle shell 3 can slide out of the outer shell 2, and one end of the internal push rod 4 can slide out of the middle shell 3; use When adding the particle into the outer shell 2, the middle shell 3 is manually pushed, and the middle shell 3 and the internal push rod 4 are moved together, so that the particle groove 5 on the middle shell 3 is aligned with the particle injection port 6 on the outer shell 2. The particle injection port 6 is provided with an openable and closable top cover, and the top cover is opened to add foreign particles into the particle groove 5 through the particle injection port 6. After adding, the top cover is closed, and the air pressure in the outer shell 2 is adjusted at the same time. After that, the middle shell 3 and the internal shell are manually moved together, and the particle groove 5 is moved to the interface between the particle entry channel and the closed laboratory 1. At this time, the internal push rod 4 is pushed, and the foreign particles in the particle groove 5 are pushed into the closed laboratory 1 by the internal push rod 4, so that the particles form a dispersed state in the closed laboratory 1;

[0036] The power supply device is used to form a detection circuit with the high-voltage conductor 10, the ground conductor 11, the high-voltage electrode 12, and the low-voltage electrode 13 to detect the flashover voltage along the surface of the material under different particle concentrations, thereby detecting the influence of the particle concentration on the insulation strength along the surface of the material;

[0037] The heating module 16 is used to adjust the temperature difference in the closed laboratory 1, thereby forming a convection environment in the closed laboratory 1, so that the diffusion movement of the particles is controlled, thereby adjusting the concentration of particles attached to the test sample;

[0038] The present invention utilizes a particle adding module to add particle foreign matter into the closed laboratory 1, and sets a heating module 16 in the closed laboratory 1, and utilizes the heat distribution characteristics to form a convection environment in the closed laboratory 1, so that the movement of particles is controlled, thereby controlling the concentration of particles attached to the test sample 14, realizing flexible addition of particles, changing the concentration of particles attached to the test sample 14, thereby obtaining reliable measurement data, simple operation, and accurate measurement.

[0039] Furthermore, if Figure 1 As shown, in order to prevent particulate foreign matter from adhering to the high-voltage conductor 10 and the grounding conductor 11 and damaging the experimental equipment, and to facilitate the cleaning of particulate foreign matter, in this embodiment, the high-voltage conductor 10 and the grounding conductor 11 are respectively provided with insulating protective sleeves 15.

[0040] Furthermore, if Figure 1 As shown, in order to improve the air tightness of the particle adding module, dynamic sealing structures 17 are respectively provided between the outer shell 2 and the middle shell 3, and between the middle shell 3 and the inner push rod 4.

[0041] It should be noted that the dynamic sealing structure 17 is used to improve the sealing of the sliding connection between the outer shell 2 and the middle shell 3, and between the middle shell 3 and the internal push rod 4, so as to facilitate the adjustment of the internal pressure state of the particle addition module and facilitate the internal push rod 4 to transport the particle foreign matter into the closed laboratory 1 under negative pressure; at the same time, the dynamic sealing structure 17 is used to ensure the airtightness during the movement process to eliminate the interference of other impurities on the measurement results.

[0042] Furthermore, if Figure 1 As shown, in order to fully push the particles in the particle slot 5 into the closed laboratory 1 , a push block 18 is provided at one end of the internal push rod 4 close to the particle slot 5 .

[0043] It should be noted that in this embodiment, the outer wall of the push block 18 fits with the inner wall of the particle groove 5 to prevent particles from being left in the gap, increase the contact area between the push block 18 and the particles, and ensure that the particles are fully pushed.

[0044] Furthermore, if Figure 1 As shown, a handle 19 is provided at the other end of the inner push rod 4 .

[0045] It should be noted that the handle 19 is used to increase the contact area between the internal push rod 4 and the operator's palm, making it easier to push the internal push rod 4.

[0046] Furthermore, if Figure 1 As shown, in order to facilitate clamping of test samples 14 of different sizes, a distance adjustment device 20 is provided between the inner wall of the closed laboratory 1 and the grounding rod 11 .

[0047] It should be noted that the distance adjustment device 20 is used to adjust the distance between the grounding rod 11 and the inner wall of the closed laboratory 1, thereby changing the distance between the high-voltage electrode 12 and the low-voltage electrode 13, and can adapt to test samples 14 of various lengths and sizes, with high flexibility.

[0048] Furthermore, if Figure 1 As shown, the distance adjustment device 20 is a spring.

[0049] It should be noted that, in order to facilitate installation and reduce costs, in this embodiment, the distance adjustment device 20 is preferably configured as a spring.

[0050] Furthermore, if Figure 1 As shown, in order to facilitate observation of the flashover phenomenon, an observation window 21 is provided on the closed laboratory 1 .

[0051] It should be noted that the observation window 21 in this embodiment is made of transparent material.

[0052] Furthermore, in this embodiment, in order to facilitate the formation of a convection environment, the temperature adjustment range of the heating module 16 is preferably set to 20 degrees to 150 degrees.

[0053] Furthermore, in order to facilitate installation and control costs, the heating module 16 in this embodiment is preferably a ceramic heating coil.

[0054] It should be noted that the installation position of the ceramic heating coil can be adjusted according to the installation position of the test sample 14, and can be installed according to the planned convection trajectory. In this embodiment, the ceramic heating coil is preferably installed near the grounding rod 11. When the particles enter the closed laboratory 1, the particles will sink due to the gravity of the particles. When the ceramic heating coil is set near the grounding rod 11, the temperature around the grounding rod 11 is higher than the temperature around the high-voltage rod 10. The heat flow will flow from the high temperature to the low temperature, thereby driving the flow of the particles, so that the movement direction of the particles is controlled, and the particles continue to adhere to the test sample 14, changing the particle concentration on the test sample 14.

[0055] Furthermore, the closed laboratory 1 is made of stainless steel or aluminum alloy.

[0056] Working principle:

[0057] When in use, close the first valve 8, set the closed laboratory 1 to a sealed state, connect an external vacuum device to the gas channel, and use the vacuum device to pump the inside of the closed laboratory 1 to a negative pressure state; pull the inner shell to make the inner shell slide inside the outer shell 2, align the particle slot 5 set on the inner shell with the particle injection port 6 on the outer shell 2, open the particle injection port 6 to add particles into the particle slot 5, and close the particle injection port 6; and connect an external vacuum device to the exhaust port 7 set on the outer shell 2 of the particle adding module, so that the pressure inside the outer shell 2 is the same as the pressure inside the closed laboratory 1; open the first valve 8, push the inner shell, and push the particle slot 5 to the connection between the particle entrance channel and the closed laboratory 1 The internal push rod 4 is pushed to the opening, and then the internal push rod 4 is pushed so that the internal push rod 4 pushes the particulate foreign matter contained in the particle slot 5 into the closed laboratory 1; the heating module 16 controls the temperature in the closed laboratory 1, so that the heat distribution inside the closed laboratory 1 is uneven, thereby forming a convection environment. When the internal push rod 4 pushes the particulate foreign matter into the closed laboratory 1, the particles are dispersed in the closed laboratory 1 and follow the convection annular flow to form a controlled motion and attach to the test sample 14, so that the concentration of particles attached to the test sample 14 can be flexibly controlled; a high-voltage power supply is externally connected to the high-voltage guide rod 10, and the flashover voltage of the test sample 14 is measured by using the formed detection circuit, so as to obtain the flashover characteristics of the test sample 14 under different particle concentrations.

[0058] In the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for exemplary explanations and cannot be understood as a limitation of this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances. In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that satisfy both A and B.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention, or directly / indirectly applied in other related technical fields should be included in the scope of protection of the claims of the present invention.

Claims

1. A surface insulation measurement device considering the influence of foreign matter, characterized in that: It includes a closed laboratory in a negative pressure state, a particle adding module, a voltage detection module, a test sample, and a heating module; The closed laboratory is provided with a particle inlet channel and a gas channel, the particle inlet channel is provided with a first valve, and the gas channel is provided with a second valve; The particle adding module comprises an outer shell, a middle shell and an inner push rod with increasing lengths in sequence, the outer shell is connected to the particle inlet channel, the middle shell is slidably connected in the outer shell, the inner push rod is slidably connected in the middle shell, a particle slot is arranged on the end of the middle shell installed in the outer shell, and an openable and closable particle injection port and an openable and closable exhaust port are arranged on the outer shell; The inner push rod is provided with a push block at one end close to the particle slot, the outer wall of the push block is in contact with the inner wall of the particle slot, the outer shell is used to isolate the particles contained in the particle slot from the external environment, the middle shell is used to connect with the particle slot containing the particle foreign matter, and the inner push rod is used to push the particle foreign matter in the particle slot into the closed laboratory. A dynamic sealing structure is provided between the outer shell and the middle shell, and between the middle shell and the inner push rod; The voltage detection module comprises a high-voltage rod, a grounding rod, a high-voltage electrode and a low-voltage electrode; the high-voltage rod and the grounding rod are respectively fixed on two opposite inner walls of the closed laboratory, the high-voltage electrode is installed at the free end of the high-voltage rod, the low-voltage electrode is installed at the free end of the grounding rod, and the grounding rod is grounded; The test sample is clamped between the high voltage electrode and the low voltage electrode; The heating module is arranged in the closed laboratory and is used for adjusting the temperature difference in the closed laboratory, thereby forming a convection environment in the closed laboratory.

2. A surface insulation measurement device considering the influence of foreign matter according to claim 1, characterized in that: The high-voltage guide rod and the grounding guide rod are respectively covered with insulating protective sleeves.

3. A surface insulation measurement device considering the influence of foreign matter according to claim 2, characterized in that: The other end of the inner push rod is provided with a handle.

4. A surface insulation measurement device considering the influence of foreign matter according to claim 3, characterized in that: A distance adjustment device is provided between the inner wall of the closed laboratory and the grounding rod.

5. A surface insulation measurement device considering the influence of foreign matter according to claim 4, characterized in that: The distance adjusting device is a spring.

6. A surface insulation measurement device considering the influence of foreign matter according to any one of claims 1 to 5, characterized in that: The closed laboratory is provided with an observation window.

7. A surface insulation measurement device considering the influence of foreign matter according to claim 6, characterized in that: The temperature adjustment range of the heating module is 20 degrees to 150 degrees.

8. The surface insulation measurement device considering the influence of foreign matter according to claim 7, characterized in that: The heating module is a ceramic heating coil.

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