A method for testing surface performance of insulating materials

Abstract

A method for testing the creepage performance of insulating materials, applied to a tooling device for testing the creepage performance of insulating materials, comprising: fixing the insulating material to be tested on the base; fixing the electrical connection device at the tail of the conductive structure; inserting the conductive structure and the electrical connection device into the shell through the through-hole, and fixing the shell to the base to form a sealed test chamber; adjusting the height of the conductive structure so that the electrical connection device abuts the insulating material to be tested; grounding the test chamber; and controlling a test power supply to output a test voltage to the end of the conductive structure away from the sealed test chamber to complete the creepage performance test. The present invention can conveniently test the creepage performance of different insulating materials in different environments, and the test is highly repeatable.

Description

Technical Field

[0001] The present invention relates to the field of electrical testing equipment, and in particular to a method for testing the surface performance of insulating materials. Background Art

[0002] Creepage distance is the shortest path measured along the insulation surface between two conductive parts, or between a conductive part and the protective interface of the equipment. Surface creepage is a very common phenomenon. Under different usage conditions, the insulating material surrounding the conductor becomes polarized, causing the insulating material to become charged and causing surface creepage. Surface creepage reduces the effective insulation distance, increasing the probability of breakdown and flashover in the insulation product and reducing the reliability of aluminum insulation joints. Surface creepage can also damage the physical structure of the insulation product, affecting its mechanical properties and posing a significant safety hazard. Therefore, surface creepage testing is necessary.

[0003] As research in the materials field continues to deepen, the difficulty of testing the creepage performance of different materials has become increasingly prominent. Currently, creepage testing of materials primarily relies on building a test setup to measure creepage distance. However, this testing environment is limited to air, making it impossible to test creepage in different environments. Therefore, there is an urgent need for a test method that can conveniently test the creepage performance of different materials in different environments. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a method for testing the creepage performance of insulating materials, which can conveniently test the creepage performance of insulating materials in different environments.

[0005] A method for testing the surface performance of an insulating material according to an embodiment of the present invention includes:

[0006] A tooling device for testing the surface performance of insulating materials, comprising a conductive structure, a test chamber, and an electrical connection device; the test chamber comprises a base and a shell detachably disposed on the base, wherein a through hole is provided on the top of the shell;

[0007] The method for testing the surface performance of an insulating material comprises:

[0008] Fixing the insulating material to be inspected on the base;

[0009] fixing the electrical connection device at the tail of the conductive structure;

[0010] Passing the conductive structure and the electrical connection device through the through-hole into the housing, and fixing the housing to the base to form a sealed test cavity, wherein a portion of the conductive structure is located outside the sealed test cavity and another portion is located inside the sealed test cavity;

[0011] Adjusting the height of the conductive structure so that the electrical connection device abuts against the insulating material to be inspected;

[0012] grounding the test chamber;

[0013] The test power supply is controlled to output a test voltage to an end of the conductive structure away from the sealed test cavity, so as to complete the creepage performance test.

[0014] According to the method for testing the surface performance of insulating materials according to the embodiment of the present invention, there are at least the following gain effects:

[0015] By connecting the conductive structure to the test power supply, the electrical connection device connects the conductive structure and the insulating material to be tested, and a test chamber composed of a base and a shell detachably arranged on the base is formed. The insulating material to be tested can be placed on the base, and a through hole is provided on the top of the shell to fix the conductive structure inserted therein, and then the conductive structure is inserted into the through hole on the top of the test chamber to form a sealed test chamber, thereby completing the rapid construction of the test environment. At the same time, the inside of the sealed test chamber can be filled with different gases or liquids, thereby making the tested insulating medium environment more diverse, and the surface creepage of the insulating material in different environments can be tested, simulating a variety of use environments to obtain results that are closer to the actual use environment. The method for testing the surface performance of insulating materials according to the embodiment of the present invention can conveniently test the surface creepage performance of different insulating materials in different environments, and make the test results as accurate and reasonable as possible and have practical use significance. The test has strong repeatability. At the same time, the experimental tooling equipment used in conjunction with the test has a simple structure, is easy to install and disassemble as a whole, is easy to operate, and has a low cost, thereby reducing manpower and material costs.

[0016] According to some embodiments of the present invention, the base includes a base flange and a clamp; the clamp is provided on the upper surface of the base flange;

[0017] The step of fixing the insulating material to be inspected on the base comprises:

[0018] The insulating material to be inspected is clamped on the fixture.

[0019] According to some embodiments of the present invention, the clamp is a bolt clamping and fixing structure.

[0020] According to some embodiments of the present invention, the conductive structure includes a test cable, a cable terminal body, and a stress cone; the test cable has a first connection end and a second connection end;

[0021] Before fixing the electrical connection device at the tail of the conductive structure, the method further includes:

[0022] The cable terminal body is arranged on the test cable and close to the first connection end;

[0023] The stress cone is arranged on the test cable and close to the second connection end.

[0024] According to some embodiments of the present invention, the electrical connection device includes a terminal and a connection fitting;

[0025] Fixing the electrical connection device at the tail of the conductive structure includes:

[0026] crimping and fixing the terminal at the second connection end of the test cable;

[0027] The connecting hardware is fixed to the bottom of the terminal post by means of bolts.

[0028] According to some embodiments of the present invention, fixing the electrical connection device at the tail of the conductive structure further includes:

[0029] A tape is wrapped around the connection between the terminal and the conductive structure.

[0030] According to some embodiments of the present invention, the step of causing the electrical connection device to abut against the insulating material to be inspected includes:

[0031] The connecting fitting is brought into contact with the insulating material to be inspected.

[0032] According to some embodiments of the present invention, the housing includes a cylindrical portion, a top cover, and a sealing ring; the top cover is provided with the through hole;

[0033] The step of inserting the conductive structure and the electrical connection device into the housing through the through hole and fixing the housing on the base to form a sealed test chamber includes:

[0034] Pass the test cable through the top cover and the sealing ring, with the top cover above the sealing ring;

[0035] Fixing the top cover to the cylinder by bolts;

[0036] The cylinder is fixed on the base by bolts.

[0037] According to some embodiments of the present invention, before controlling the test power supply to output the test voltage to the end of the conductive structure away from the sealed test chamber, the method further includes:

[0038] The sealed test cavity is filled with an insulating medium, which is a liquid insulating agent or an insulating gas.

[0039] According to some embodiments of the present invention, controlling the test power supply to output the test voltage to an end of the conductive structure away from the sealed test chamber includes:

[0040] The test power supply is controlled to output a test voltage to the first connection end of the test cable. Additional aspects and advantages of the present invention will be described in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0042] Figure 1 This is a flow chart of a method for testing the surface performance of an insulating material according to an embodiment of the present invention;

[0043] Figure 2 This is a structural diagram of a tooling device for testing the surface performance of insulating materials according to an embodiment of the present invention.

[0044] Reference numerals:

[0045] Cylinder 111, top cover 112, sealing ring 113, base flange 121, clamp 122, insulating medium 130,

[0046] Test cable 210, cable terminal body 220, stress cone 230,

[0047] Terminal 310, connecting hardware 320, strip 330,

[0048] Insulation material 400 to be inspected. DETAILED DESCRIPTION

[0049] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0050] In the description of the present invention, if there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0051] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are 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, and therefore cannot be understood as a limitation on the present invention.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0053] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments.

[0054] In order to better understand the method for testing the surface performance of insulating materials of the present invention, reference is made to Figure 2 First, we briefly describe the required tooling for testing the surface properties of insulating materials. The tooling includes a conductive structure, a test chamber, and an electrical connection device. The test chamber includes a base and a removable housing mounted on the base. The upper surface of the base is used to hold the insulating material 400 to be tested. The top of the housing is provided with a through-hole. The housing and base form a sealed test chamber after the conductive structure is inserted into the through-hole. The electrical connection device is located at one end of the conductive structure near the base and is used to abut the insulating material 400 to be tested after the conductive structure is inserted into the housing.

[0055] The following describes a method for testing the surface performance of insulating materials according to an embodiment of the present invention based on the above-mentioned testing tooling equipment.

[0056] like Figure 1 As shown, an embodiment of the present invention provides a method for testing the surface performance of an insulating material. The method for testing the surface performance of an insulating material includes but is limited to the following steps:

[0057] Fix the insulating material 400 to be inspected on the base;

[0058] Fixing an electrical connection device at the tail of the conductive structure;

[0059] Inserting the conductive structure and the electrical connection device into the housing through the through-hole, and fixing the housing to the base to form a sealed test cavity, wherein a portion of the conductive structure is located outside the sealed test cavity and another portion is located inside the sealed test cavity;

[0060] Adjust the height of the conductive structure so that the electrical connection device contacts the insulating material 400 to be inspected;

[0061] Ground the test chamber;

[0062] Control the test power supply to output the test voltage to the end of the conductive structure away from the sealed test chamber to complete the surface performance test. Place the insulating material 400 to be tested on the base of the test chamber, fix the electrical connection device to the bottom end of the conductive structure, and extend the conductive structure into the through hole on the test chamber shell, then fix the base of the test chamber to the shell, and ground the test chamber. Finally, adjust the height of the conductive structure so that the electrical connection device at its bottom is against the insulating material 400 to be tested. At this time, the test tooling is installed and the insulating material 400 to be tested is placed. After filling the sealed chamber with insulating medium 130 and connecting the conductive structure to an external test power supply, start the test. The high voltage will cause surface creepage on the surface of the insulating material 400 to be tested. According to the size of the applied voltage, the required test results can be obtained to judge the surface creepage electrical performance of the insulating material 400 to be tested.

[0063] The method for testing the creepage performance of insulating materials according to the embodiment of the present invention comprises connecting a conductive structure to a test power supply, electrically connecting the conductive structure to the insulating material 400 to be tested, and providing a test chamber composed of a base and a shell detachably disposed on the base. The insulating material 400 to be tested can be placed on the base, and a through hole is provided in the top of the shell to fix the conductive structure therein. The conductive structure then extends into the through hole in the top of the test chamber to form a sealed test chamber, thereby completing the rapid construction of the test environment. At the same time, the interior of the sealed test chamber can be filled with different gases or liquids, thereby making the test environment of the insulating medium 130 more diverse, and the creepage performance of the insulating material under different environments can be tested, simulating a variety of use environments to obtain results that are closer to the actual use environment. The method for testing the creepage performance of insulating materials according to the embodiment of the present invention can conveniently test the creepage performance of different insulating materials in different environments, and make the test results as accurate and reasonable as possible and have practical significance. The test has strong repeatability. At the same time, the experimental tooling equipment used in conjunction with the test is simple in structure, easy to install and disassemble as a whole, convenient to operate, low in cost, and reduces manpower and material costs.

[0064] In some embodiments, the base includes a base flange 121 and a clamp 122 ; the clamp 122 is disposed on the upper surface of the base flange 121 ;

[0065] Fixing the insulating material 400 to be inspected on a base includes:

[0066] The insulating material 400 to be inspected is clamped on the fixture 122 .

[0067] The fixture 122 can be used to clamp and fix the insulating material 400 to be tested, thereby preventing the material from moving during the test and causing deviation in the test results, thereby reducing test errors.

[0068] In some embodiments, the clamp 122 is a bolt-clamped fixing structure. The bolt-clamped fixing structure allows the clamping distance of the clamp 122 to be adjusted by rotating the bolt, which can better accommodate the 400 samples of insulating material to be tested of different sizes. Furthermore, the bolt-clamped fixing structure is easy to assemble and disassemble, has a simple structure, is low in cost, and is easy to produce.

[0069] In some embodiments, the conductive structure includes a test cable 210, a cable terminal body 220, and a stress cone 230; the test cable 210 has a first connection end and a second connection end;

[0070] Before fixing the electrical connection device at the tail of the conductive structure, the method further includes:

[0071] The cable terminal body 220 is arranged on the test cable 210 and close to the first connection end;

[0072] The stress cone 230 is disposed on the test cable 210 and close to the second connection end.

[0073] The cable terminal body 220 is mounted outside the test cable 210 near the first connection end, and the stress cone 230 is mounted outside the test cable 210 near the second connection end, which can improve the electric field concentration phenomenon at the fracture between the cable insulation and the insulation shielding layer at the other end.

[0074] In some embodiments, the electrical connection device includes a terminal 310 and a connection fitting 320;

[0075] An electrical connection device is fixed at the tail of the conductive structure, including:

[0076] crimping a fixing terminal 310 at the second connection end of the test cable 210;

[0077] The connecting fitting 320 is fixed to the bottom of the terminal post 310 by means of bolts.

[0078] The upper portion of the terminal 310, which connects to the test cable 210, is tubular and is crimped and clamped to the bottom of the test cable 210. This reduces the contact resistance between the cable core and the terminal 310, thereby reducing current loss, improving power supply reliability, and ultimately increasing the safety and service life of the cable. The upper end of the connecting fitting 320 is bolted to the bottom of the terminal 310, ensuring a secure fit and preventing loosening.

[0079] In some embodiments, fixing the electrical connection device at the tail of the conductive structure further includes:

[0080] The tape 330 is wrapped around the connection between the terminal 310 and the conductive structure.

[0081] Wrapping the tape 330 at the connection can further increase the strength and stability of the connection, avoiding problems of loosening or falling off during use.

[0082] In some embodiments, the strip 330 may be any one of a heat shrink tubing, epoxy putty, and a waterproof tape. The heat shrink tubing is a tubular material that shrinks when heated to cover and protect the wiring. It has a good waterproof effect and can ensure that the wiring is not damaged in a humid environment. It has high elasticity and can completely cover the required part after shrinking, fit tightly, and form a perfect waterproof isolation layer. It is corrosion-resistant and can well resist the erosion of corrosive substances such as acids and alkalis. It is also high-temperature resistant and can ensure that the wiring can still be well protected in a high-temperature environment. Epoxy putty has high viscosity and is easy to process. It can be processed into various shapes for packaging, sealing, insulation, fixing, etc. It also has the advantages of high strength, high-temperature resistance, and corrosion resistance. The waterproof tape provides a durable waterproof seal.

[0083] In some embodiments, placing the electrical connection device in contact with the insulating material 400 to be inspected includes:

[0084] The connection fitting 320 is brought into contact with the insulating material 400 to be inspected.

[0085] The upper end of the connecting hardware 320 is fixed to the bottom of the terminal 310 by bolts, so that its lower end contacts the insulating material to be tested 400, and the entire experimental circuit can be connected. At this time, the electrical connection device as a whole connects the insulating material to be tested 400 and the conductive structure, providing the insulating material to be tested 400 with an external test power supply connected from the conductive structure, and ensuring the reliability of the connection.

[0086] In some embodiments, the housing includes a barrel 111, a top cover 112, and a sealing ring 113; the top cover 112 is provided with a through hole;

[0087] Inserting the conductive structure and the electrical connection device into the housing through the through hole, and fixing the housing on the base to form a sealed test chamber, including:

[0088] Pass the test cable 210 through the top cover 112 and the sealing ring 113, with the top cover 112 above the sealing ring 113;

[0089] The top cover 112 is fixed to the cylinder 111 by bolts;

[0090] The cylinder 111 is fixed to the base by bolts.

[0091] The barrel 111 has a certain height and can accommodate insulating materials 400 to be tested of different sizes. The top cover 112 is provided with a through hole through which the conductive structure can pass. A sealing ring 113 is provided between the top cover 112 and the barrel 111. The conductive structure passes through the through hole of the top cover 112 and the sealing ring 113, and the top cover 112 is above the sealing ring 113. Then the top cover 112 is installed and fixed on the barrel 111. At this time, the sealing ring 113 is sleeved on the outside of the conductive structure and is located between the top cover 112 and the barrel 111. Since the top cover 112 and the barrel 111 are installed and fixed, the sealing ring 113 is squeezed, clamped and sealed. After the barrel 111 is installed and fixed to the base, a sealed test chamber is formed in the test chamber, and the conductive structure is also clamped and fixed in position. However, the position of the conductive structure fixed by the clamping sealing ring 113 is floating. By adjusting the position where the conductive structure is clamped and fixed, the height of the conductive structure inside the test chamber can be adjusted accordingly, thereby flexibly changing the electrode spacing and effectively simulating the actual situation of surface creepage. When the position of the conductive structure needs to be adjusted, the fixed structure between the top cover 112 and the barrel 111 can be disassembled or loosened, and then the position of the conductive structure can be moved to the required position, and then the fixed structure between the top cover 112 and the barrel 111 can be installed or tightened. At present, the surface creepage test mainly adopts the method of building a test device to measure the creepage distance. During the implementation process, there is a problem that the distance between the electrodes cannot be adjusted. The method for surface performance testing of insulating materials and its supporting tooling equipment of the embodiment of the present invention can change the distance between the electrodes by adjusting the position of the conductive structure, thereby solving the problem that the distance between the electrodes cannot be adjusted.

[0092] In some embodiments, the cylinder 111 is provided with an air intake structure, which allows the interior of the test chamber to be filled with different insulating media 130, which can be gas or liquid. This facilitates creepage performance testing of the insulating material 400 under various different insulating media 130 environments. In some embodiments, the air intake structure is a gas filling hole and a hole plug, or it can be an air intake valve.

[0093] In some embodiments, before controlling the test power supply to output the test voltage to the end of the conductive structure away from the sealed test chamber, the method further includes:

[0094] The sealed test chamber is filled with an insulating medium 130 , which is a liquid insulating agent or an insulating gas.

[0095] Filling the test chamber with insulating medium 130 ensures the dielectric strength of the sealed test chamber during testing. Filling with different insulating mediums 130 allows for testing creepage in different environments, simulating a variety of usage scenarios and ensuring accurate, reasonable, and practical test results. The insulating gas can be air or sulfur hexafluoride (SF6). SF6 is a widely used insulating gas due to its stable chemical properties, excellent insulation and arc-extinguishing properties.

[0096] In some embodiments, controlling the test power supply to output the test voltage to an end of the conductive structure away from the sealed test chamber includes:

[0097] The test power supply is controlled to output a test voltage to the first connection end of the test cable 210 .

[0098] The test cable 210 is a conductive material that can be connected to a test power supply.

[0099] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0100] Although the embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, the present invention is not limited to the above embodiments. Those skilled in the art will understand that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for testing the surface performance of an insulating material, characterized in that: A tooling device for testing the surface performance of insulating materials, comprising a conductive structure, a test chamber, and an electrical connection device; the test chamber comprises a base and a shell detachably mounted on the base, the top of the shell being provided with a through-hole; the electrical connection device comprises a terminal and a connection fitting; the shell comprises a barrel, a top cover, and a sealing ring, wherein the sealing ring is configured to float in the position where the conductive structure is fixed; The method for testing the surface performance of an insulating material comprises: Fixing the insulating material to be inspected on the base; fixing the electrical connection device at the tail of the conductive structure; Passing the conductive structure and the electrical connection device through the through-hole into the housing, and fixing the housing to the base to form a sealed test cavity, wherein a portion of the conductive structure is located outside the sealed test cavity and another portion is located inside the sealed test cavity; Adjusting the height of the conductive structure so that the electrical connection device abuts against the insulating material to be inspected; grounding the test chamber; The test power supply is controlled to output a test voltage to an end of the conductive structure away from the sealed test cavity, so as to complete the creepage performance test.

2. The method for testing the surface performance of insulating materials according to claim 1, characterized in that: The base includes a base flange and a clamp; the clamp is arranged on the upper surface of the base flange; The step of fixing the insulating material to be inspected on the base comprises: The insulating material to be inspected is clamped on the fixture.

3. The method for testing the surface performance of insulating materials according to claim 2, characterized in that: The clamp is a bolt clamping and fixing structure.

4. The method for testing the surface performance of insulating materials according to claim 1, characterized in that: The conductive structure includes a test cable, a cable terminal body, and a stress cone; The test cable has a first connection end and a second connection end; Before fixing the electrical connection device at the tail of the conductive structure, the method further includes: The cable terminal body is arranged on the test cable and close to the first connection end; The stress cone is arranged on the test cable and close to the second connection end.

5. The method for testing the surface performance of insulating materials according to claim 1 or 4, characterized in that: Fixing the electrical connection device at the tail of the conductive structure includes: crimping and fixing the terminal at the second connection end of the test cable; The connecting hardware is fixed to the bottom of the terminal post by means of bolts.

6. The method for testing the surface performance of insulating materials according to claim 5, characterized in that: The method of fixing the electrical connection device at the tail of the conductive structure further includes: Wrap tape around the connection between the terminal and the test cable.

7. The method for testing the surface performance of insulating materials according to claim 5, characterized in that: The step of bringing the electrical connection device into contact with the insulating material to be inspected comprises: The connecting fitting is brought into contact with the insulating material to be inspected.

8. The method for testing the surface performance of insulating materials according to claim 4, characterized in that: The top cover is provided with the through hole; The step of inserting the conductive structure and the electrical connection device into the housing through the through hole and fixing the housing on the base to form a sealed test chamber includes: Pass the test cable through the top cover and the sealing ring, with the top cover above the sealing ring; Fixing the top cover to the cylinder by bolts; The cylinder is fixed on the base by bolts.

9. The method for testing the surface performance of insulating materials according to claim 8, characterized in that: Before the control test power supply outputs the test voltage to the end of the conductive structure away from the sealed test cavity, the method further includes: The sealed test cavity is filled with an insulating medium, which is a liquid insulating agent or an insulating gas.

10. The method for testing the surface performance of insulating materials according to claim 4, characterized in that: The controlling the test power supply to output the test voltage to the end of the conductive structure away from the sealed test cavity comprises: Control the test power supply to output a test voltage to the first connection end of the test cable.

Images