Carbonization testing system for cable insulation materials

Abstract

This application relates to a carbonization testing system for cable insulation materials, belonging to the field of cable insulation material carbonization testing. It can effectively detect the impact of voltage on the carbonization of cable insulation materials and accurately locate the breakdown voltage of the cable insulation material, improving the reliability and safety of the cable insulation material. The cable insulation material carbonization testing system includes: a control module for sending test commands, which at least include a preset applied voltage for the insulation material of the cable under test; a first simulation module for applying voltage to the insulation material of the cable under test according to the test commands, such that the applied voltage on the insulation material of the cable under test equals the preset applied voltage; a test module for acquiring the actual voltage in the circumferential direction of the cable under test; and a judgment module for determining whether carbonization has occurred in the insulation material of the cable under test based on the actual voltage.

Description

Technical Field

[0001] This application relates to the field of carbonization testing of cable insulation materials, and specifically to a carbonization testing system for cable insulation materials. Background Technology

[0002] Cable insulation plays a crucial role in electrical equipment, ensuring safe current transmission and surrounding the cable to prevent electrical leakage. However, cable insulation can carbonize under high temperatures, leading to a decline in insulation performance and potentially causing short circuits. Furthermore, short circuits caused by carbonized cable insulation are often accompanied by a sustained electric arc, which can then ignite the insulation material itself. Short circuits resulting from cable insulation carbonization primarily occur when the damaged carbonized insulation breaks down under phase-to-phase voltage, causing electrical discharge.

[0003] Currently, traditional methods for testing the carbonization of cable insulation materials have relatively simple testing conditions, making it difficult to simulate the carbonization that occurs during actual use of cables. This can affect the objectivity and reliability of the test results. Summary of the Invention

[0004] The purpose of this application is to provide a carbonization testing system for cable insulation materials, which can effectively detect the impact of voltage on the carbonization of cable insulation materials and accurately locate the breakdown voltage of the cable insulation materials, thereby improving the reliability and safety of cable insulation materials.

[0005] To achieve the objectives of this application, the following technical solution is provided:

[0006] In a first aspect, this application provides a carbonization testing system for cable insulation materials, comprising:

[0007] The control module is used to send test commands, which include at least a preset applied voltage to the insulation material of the cable under test;

[0008] The first simulation module is used to apply a voltage to the insulation material of the cable under test according to the test command, so that the applied voltage on the insulation material of the cable under test is equal to the preset applied voltage. The input terminal of the first simulation module is electrically connected to the output terminal of the control module.

[0009] The test module is used to obtain the actual voltage in the circumferential direction of the cable under test, and the input terminal of the test module is electrically connected to the output terminal of the control module.

[0010] The judgment module is used to determine whether the insulation material of the cable under test has carbonized based on the actual voltage. The input terminal of the judgment module is electrically connected to the output terminal of the test module.

[0011] In one embodiment, the carbonization testing system for the cable insulation material further includes:

[0012] The second simulation module is used to change the temperature of the environment in which the insulation material of the cable under test is located according to the test command, so that the temperature of the environment in which the insulation material of the cable under test is located is equal to the preset ambient temperature. The test command also includes the preset ambient temperature of the environment in which the insulation material of the cable under test is located. The input terminal of the second simulation module is electrically connected to the output terminal of the control module.

[0013] In one embodiment, the second simulation module includes:

[0014] A heating unit is used to heat the environment in which the insulation material of the cable under test is located;

[0015] A temperature measuring unit is used to measure the temperature of the environment in which the insulation material of the cable under test is located. The input terminal of the temperature measuring unit is electrically connected to the output terminal of the control module.

[0016] A temperature control unit is used to determine whether the temperature of the environment in which the insulation material of the cable under test is located is equal to the preset ambient temperature. If the temperature of the environment in which the insulation material of the cable under test is located is equal to the preset ambient temperature, the heating unit is controlled to stop heating. The input terminal of the temperature judgment unit is electrically connected to the output terminal of the temperature measurement unit, and the output terminal of the temperature control unit is electrically connected to the input terminal of the heating unit.

[0017] In one embodiment, the carbonization testing system for the cable insulation material further includes:

[0018] The position adjustment module is used to change the test position of the insulation material of the cable under test according to the test command, so that the test position of the insulation material of the cable under test is at the target test position. The test command also includes the target test position of the insulation material of the cable under test. The input terminal of the position adjustment module is electrically connected to the output terminal of the control module.

[0019] In one embodiment, the first simulation module includes a first electrode and a second electrode, the first electrode being electrically connected to the positive terminal of an external power supply, and the second electrode being electrically connected to the negative terminal of the external power supply.

[0020] In one embodiment, the first electrode includes a stationary electrode and the second electrode includes a moving electrode, the moving electrode being configured to change its position according to the cross-sectional shape of the cable under test.

[0021] In one embodiment, the judgment module includes a first end and a second end, the first end being electrically connected to the first electrode and the second end being electrically connected to the second electrode. The judgment module is used to determine whether the insulation material of the cable under test has carbonized based on the actual voltage difference between the first electrode and the second electrode.

[0022] In one embodiment, the judgment module is used to determine whether the insulation material of the cable under test has carbonized based on the relationship between the voltage difference between the positive and negative terminals of the external power supply and the actual voltage difference between the first electrode and the second electrode.

[0023] In one embodiment, the heating unit includes a thermal radiator.

[0024] Secondly, this application provides a method for short-circuit testing of cable insulation materials, the method comprising:

[0025] Send a test command, which includes at least a preset applied voltage to the insulation material of the cable under test;

[0026] According to the test command, a voltage is applied to the insulation material of the cable under test, such that the applied voltage on the insulation material of the cable under test is equal to the preset applied voltage;

[0027] Obtain the actual voltage in the circumferential direction of the cable under test;

[0028] Determine whether the cable under test has carbonized based on the actual voltage.

[0029] The cable insulation material short-circuit testing system and method of this application send test commands through a control module. These commands include at least a preset applied voltage for the insulation material of the cable under test. A first simulation module then applies a voltage to the insulation material according to the test commands, ensuring that the applied voltage equals the preset applied voltage. This ensures that the cable insulation material is subjected to voltage breakdown testing under the applied preset voltage. The test module further acquires the actual voltage along the circumference of the cable under test. Finally, a judgment module determines whether carbonization has occurred in the cable under test based on the actual voltage. This allows for timely and accurate identification of carbonization in the cable insulation material based on the actual voltage along the circumference. Furthermore, the applied voltage can be used to determine the breakdown voltage corresponding to carbonization of the cable insulation material, thereby improving the reliability and objectivity of the test results. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments or conventional technologies of this disclosure, the accompanying drawings used in the description of the embodiments or conventional technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic structural diagram of an insulation material short-circuit testing system provided in an embodiment of this application;

[0032] Figure 2 This is a schematic structural diagram of a power supply device in an insulation material short-circuit testing system provided in an embodiment of this application;

[0033] Figure 3 This is a schematic circuit diagram of a power supply device in an insulation material short-circuit test system provided in an embodiment of this application;

[0034] Figure 4 This is a schematic structural diagram of a testing device in an insulation material short-circuit testing system provided in an embodiment of this application;

[0035] Figure 5 This is a schematic circuit diagram of a testing device in an insulation material short-circuit testing system provided in an embodiment of this application;

[0036] Figure 6 This is a schematic structural diagram of another short-circuit testing system for insulating materials provided in the embodiments of this application;

[0037] Figure 7 This is a schematic structural diagram of an insulation material short-circuit testing system provided in this application, including a first electrode and a second electrode;

[0038] Figure 8 This is a schematic top view of a short-circuit testing system for insulating materials provided in an embodiment of this application, including a first electrode and a second electrode;

[0039] Figure 9 This is a schematic cross-sectional view of a conical calorimetric heating element in an insulation material short-circuit testing system provided in this application embodiment;

[0040] Figure 10 This is a schematic structural diagram of a cone-shaped calorimetric heating element in an insulation material short-circuit testing system provided in this application embodiment;

[0041] Figure 11 This is a schematic flowchart of a short-circuit testing system for insulating materials provided in real time for this application.

[0042] Explanation of reference numerals in the attached figures

[0043] 100. Control module; 200. First simulation module; 300. Test module; 400. Judgment module; 50. Second simulation module; 5001. Heating unit; 5002. Temperature measurement unit; 5003. Temperature control unit; 600. Position adjustment module;

[0044] 1. Power supply device; 2. Testing device; 3. Loading device; 4. Current and voltage display device; 5. Load box; 6. Power indicator light; 7. Main switch; 8. Control switch; 9. Data acquisition industrial computer; 10. Transformer; 11. First voltmeter; 12. Second voltmeter; 13. Boost button; 14. Buck button; 15. Start switch; 16. Stop switch; 17. Ignition switch; 18. Temperature controller; 19. Conical calorimeter heating element; 20. Static electrode; 21. Support frame; 22. Cable under test; 23. Moving electrode; 24. Support platform; 25. Connecting rod; 26. Connection fixing point; 27. Adjusting slider; 28. Sliding rod; 29. ​​Stable base; 30. Coupling; 31. Drive motor; 32. High temperature resistant wire. Detailed Implementation

[0045] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate preferred embodiments of the application. However, this application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0047] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that when the terms “comprise” and / or “comprising” are used in this specification, the presence of the stated feature, integer, step, operation, element, and / or part is established, but the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or groups is not excluded. Meanwhile, when used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0048] The insulation material of cables plays an important role in electrical equipment. It ensures the safe transmission of current and is used to surround the cable to prevent electrical leakage.

[0049] However, cable insulation materials carbonize under high temperatures, leading to a decline in insulation performance and potentially causing short circuits. Furthermore, short circuits caused by carbonized cable insulation are often accompanied by a continuous electric arc, which can lead to spontaneous combustion of the insulation material. Short circuits caused by carbonized cable insulation primarily result from the breakdown of damaged carbonized insulation under phase-to-phase voltage. Currently, traditional methods for testing the carbonization of cable insulation cannot measure the impact of voltage on carbonization, nor can they accurately determine the critical breakdown voltage of the cable insulation, leaving the insulation at risk of carbonization due to excessively high voltage.

[0050] This application provides a carbonization testing system for cable insulation materials. Please refer to [link / reference]. Figure 1 The cable insulation carbonization testing system includes a control module 100, a first simulation module 200, a testing module 300, and a judgment module 400. The control module 100 sends test commands, which include at least a preset applied voltage to the insulation material of the cable under test. The first simulation module 200 applies voltage to the insulation material of the cable under test according to the test commands, ensuring that the applied voltage on the insulation material equals the preset applied voltage. The input terminal of the first simulation module 200 is electrically connected to the output terminal of the control module 100. The testing module 300 acquires the actual voltage along the circumference of the cable under test. The input terminal of the testing module 300 is electrically connected to the output terminal of the control module 100. The judgment module 400 determines whether carbonization has occurred in the insulation material of the cable under test based on the actual voltage. The input terminal of the judgment module 400 is electrically connected to the output terminal of the testing module 300.

[0051] For example, the preset applied voltage is the test voltage of the insulation material of the cable under test during the test. The preset applied voltage can be freely set according to the actual use scenario of the cable under test. When testing the same cable under test, there can be multiple preset applied voltages, and different preset applied voltages can be continuously set until the critical voltage at which the cable under test carbonizes is accurately measured.

[0052] It should be noted that when the surface of the cable insulation material is damp, a leakage current will be generated on the surface when the electric field is large enough. The heat generated by the discharge causes local carbonization of the material surface. Since the carbonized products have high conductivity, the electric field density is concentrated in the carbonized part, causing repeated discharges. More carbonized products are generated around it, forming a carbonized conductive path that extends towards the electrode, eventually leading to a short circuit.

[0053] For example, the first simulation module 200 is used to apply a voltage to the insulation material of the cable under test according to the test command, such that the applied voltage on the insulation material of the cable under test is equal to a preset applied voltage. In a specific embodiment, please refer to... Figure 2 A schematic structural diagram of the power supply device 1 in an insulation material short-circuit test system shown in the figure. Figure 3 This is a schematic circuit diagram of a power supply device 1 in a short-circuit testing system for insulation materials. The power supply device 1 provides voltage to the carbonization testing system for cable insulation materials. The power supply device 1 outputs voltage, which is then boosted by a transformer 10 to further power the load cell 5. The output voltage of the power supply device 1 can be changed by altering the power of the load cell 5. Specifically, the output voltage of the power supply device 1 can be set according to actual conditions; for example, the power of the load cell 5 in this embodiment is 5KW. More specifically, a high-temperature resistant wire 32 can be used as the output wire of the load cell 5. The power supply device 1 may also include a power indicator light 6, a main switch 7, a control module switch 8, a first voltmeter 11, a boost button 13, and a buck button 14. When the power supply device 1 is connected to the power supply, the power indicator light 6 indicates that it is powered on. The main switch 7 is used to start the power supply device 1. The control switch 8 is used to control the output voltage and interruption of the power supply device 1. The first voltmeter 11 is electrically connected to the output terminal of the load cell 5 and is used to measure the output voltage of the load cell 5. The boost button 13 and the buck button 14 can adjust the test voltage in real time according to the actual test conditions.

[0054] For example, the test module 300 is used to acquire the actual voltage in the circumferential direction of the cable under test. In a specific embodiment, please refer to... Figure 4 A schematic structural diagram of the test device 2 in a short-circuit test system for insulating materials shown in the figure. Figure 5 A schematic circuit diagram of a short-circuit testing system for insulation materials is provided. The testing device 2 may include an ammeter (not shown), a second voltmeter 12, and a current and voltage display device 4. The second voltmeter 12 can measure the actual voltage on the circumference of the cable under test, the ammeter can measure the actual current on the circumference of the cable under test under the action of the actual voltage, and the current and voltage display device 4 can record the voltage and current values ​​on the circumference of the cable under test at different times to provide current and voltage data of the carbonization testing system for cable insulation materials.

[0055] For example, the judgment module 400 is used to determine whether the cable under test has carbonized based on the actual voltage. Specifically, it can use, for example... Figure 1 The data acquisition industrial control computer 9 shown analyzes the carbonization test data of the cable insulation material.

[0056] The cable insulation material short-circuit testing system of this application sends a test command through the control module 100. The test command includes at least a preset applied voltage for the insulation material of the cable under test. The first simulation module 200 then applies a voltage to the insulation material of the cable under test according to the test command, ensuring that the applied voltage on the insulation material equals the preset applied voltage. This ensures that the voltage breakdown test of the cable insulation material is performed under the applied preset voltage. The test module 300 further acquires the actual voltage along the circumference of the cable under test, and finally, the judgment module 400 determines whether carbonization has occurred in the cable under test based on the actual voltage. This system can promptly and accurately identify carbonization of the cable insulation material based on the actual voltage along the circumference of the cable under test. Furthermore, it can determine the breakdown voltage corresponding to carbonization of the cable insulation material based on the applied voltage, thereby improving the reliability and objectivity of the test results.

[0057] In some embodiments, please continue reading Figure 6 The cable insulation material short-circuit test system also includes: a second simulation module 500, which is used to change the temperature of the environment where the insulation material of the cable under test is located according to the test command, so that the temperature of the environment where the insulation material of the cable under test is located is equal to the preset ambient temperature. The test command also includes the preset ambient temperature of the environment where the insulation material of the cable under test is located. The input terminal of the second simulation module 500 is electrically connected to the output terminal of the control module 100.

[0058] It should be noted that when the electric field is sufficiently large, leakage current will be generated on the surface of the cable insulation material. The heat generated by the discharge will cause the material surface to carbonize, ultimately leading to a short circuit. Temperature has a crucial effect on cable insulation materials. As the temperature rises, the conductivity of the cable insulation material increases, resulting in a decrease in resistance. Therefore, the carbonization measurement of cable insulation materials must use temperature as a key variable to simulate the temperature of the cable in its normal operating environment. Furthermore, this can be combined with the applied voltage of the cable under test to jointly determine the conditions under which carbonization occurs in the insulation material of the cable under test. This can improve the diversity and comprehensiveness of the test conditions, and enhance the objectivity and reliability of the test results.

[0059] In some embodiments, please continue reading Figure 6The second simulation module 500 includes: a heating unit 5001 for heating the environment in which the insulation material of the cable under test is located; a temperature measuring unit 5002 for measuring the temperature of the environment in which the insulation material of the cable under test is located, the input terminal of the temperature measuring unit 5002 being electrically connected to the output terminal of the control module 100; and a temperature control unit 5003 for determining whether the temperature of the environment in which the insulation material of the cable under test is located is equal to a preset ambient temperature. If the temperature of the environment in which the insulation material of the cable under test is located is equal to the preset ambient temperature, the heating unit 5001 is controlled to stop heating. The input terminal of the temperature determination unit is electrically connected to the output terminal of the temperature measuring unit 5002, and the output terminal of the temperature control unit 5003 is electrically connected to the input terminal of the heating unit 5001.

[0060] As an example, the heating unit 5001 is used to heat the environment in which the insulation material of the cable under test is located. Specifically, see, for example... Figure 7 The schematic diagram of a short-circuit testing system for insulation materials shown illustrates a method that uses a conical calorimetric heating element 19 to heat the environment surrounding the insulation material of the cable under test. A temperature measurement unit 5002 measures the temperature of this environment. Specifically, a thermometer can be used to measure the temperature of the environment surrounding the insulation material. It should be noted that the temperature of the environment surrounding the insulation material can simulate the operating environment temperature of the insulation material during normal operation. A temperature control unit 5003 determines whether the temperature of the environment surrounding the insulation material is equal to a preset ambient temperature. If the temperature equals the preset ambient temperature, the heating unit 5001 stops heating. The temperature control unit 5003 ensures that the temperature of the environment surrounding the insulation material during testing is accurately within the preset ambient temperature range, providing precise data support for simulating the operating environment temperature of the insulation material during normal operation. Specifically, the temperature control unit may include a temperature controller 18.

[0061] In some embodiments, please continue reading Figure 6 The cable insulation material short-circuit test system also includes: a position adjustment module 600, which is used to change the test position of the insulation material of the cable under test according to the test command, so that the test position of the insulation material of the cable under test is at the target test position. The test command also includes the target test position of the insulation material of the cable under test. The input terminal of the position adjustment module 600 is electrically connected to the output terminal of the control module 100.

[0062] As an example, the position adjustment module 600 can accurately determine the position of the insulation material of the cable under test, and then place the test position of the insulation material of the cable under test at the target test position. It can adjust the test position of the insulation material of the cable under test according to the needs of different test positions of the cable insulation material, so as to ensure the accuracy of the test of the insulation material of the cable under test. The position test command also includes the target test position of the insulation material of the cable under test. The target test position can be set according to the actual situation to detect different positions of the insulation material of the cable.

[0063] In some embodiments, please refer to Figure 7 The first analog module 200 includes a first electrode and a second electrode. The first electrode is electrically connected to the positive terminal of the external power supply, and the second electrode is electrically connected to the negative terminal of the external power supply.

[0064] As an example, the first electrode is electrically connected to the positive terminal of the external power supply, and the second electrode is electrically connected to the negative terminal of the external power supply. The first and second electrodes are used to clamp the cable under test along the periphery of the cable under test, so that a test voltage is applied to the insulation material of the cable under test through the first and second electrodes.

[0065] In some embodiments, please continue reading Figure 7 and Figure 8 The first electrode includes a stationary electrode 20, and the second electrode includes a moving electrode 23. The moving electrode 23 is used to change its position according to the cross-sectional shape of the cable under test.

[0066] As an example, the first electrode can be a static electrode 20, which is in a fixed position. The second electrode can be a moving electrode 23. When the cable under test is placed between the first electrode and the second electrode, the position of the second electrode is changed according to the cross-sectional shape of the cable under test. The first electrode and the second electrode are used to clamp the cable under test, thereby fixing the test position of the cable under test. Furthermore, when testing cables with different cross-sectional shapes, the position of the second electrode can be changed to fix the cables under test with different cross-sectional shapes. This can improve the practicality of the cable insulation material short-circuit test system.

[0067] In one specific embodiment, the cable insulation material short-circuit testing system may further include a support platform 24, a stable base 29, and a support frame 21. The support platform 24 is used to support the first electrode, the second electrode, and the insulation material of the cable under test. Specifically, the support platform 24 may be a ceramic support platform, which has the advantages of high temperature and high pressure resistance, making it more suitable for use in high temperature and high pressure testing environments. The support frame 21 is used to support the support platform 24 and may further include a connecting rod 25, a connecting fixing point 26, an adjusting slider 27, and a sliding rod 28. The connecting rod 25 is used to connect the connecting fixing point 26 and the support platform 24. The connection includes a fixed point 26 for fixing the support platform 24, ensuring its stability during testing. A slider 27 is located on a slide rod 28. Adjusting the position of the slider 27 changes the position of the second electrode to fix cables 22 with different cross-sections. A stable base 29 is located between the support platform 24 and the support frame 21, providing stable bearing conditions for the support platform 24. A coupling 30 is used to adjust the position of the slider 27 to send the cable 22 to the test position for testing the insulation material. A drive motor 31 drives the coupling 30 to achieve automatic operation of the coupling 30.

[0068] In some embodiments, please continue reading Figure 1 The judgment module 400 includes a first end and a second end. The first end is electrically connected to the first electrode, and the second end is electrically connected to the second electrode. The judgment module 400 is used to determine whether the insulation material of the cable under test has carbonized based on the actual voltage difference between the first electrode and the second electrode.

[0069] As an example, when the insulation material of the cable under test has not been carbonized, there is a voltage difference between the first electrode and the second electrode. When the insulation material of the cable under test has been carbonized, the voltage difference between the first electrode and the second electrode decreases due to the conductive circuit formed by the insulation material of the cable under test. Therefore, by connecting the first end of the disconnect module to the first electrode and the second end to the second electrode, the actual voltage difference between the first electrode and the second electrode can be used to determine whether the cable under test has been carbonized.

[0070] In some embodiments, please continue reading Figure 1 The judgment module 400 is used to determine whether the insulation material of the cable under test has carbonized based on the relationship between the voltage difference between the positive and negative terminals of the external power supply and the actual voltage difference between the first electrode and the second electrode.

[0071] As an example, if the insulation material of the cable under test is not carbonized, the first electrode is electrically connected to the positive terminal of the external power supply. Therefore, the voltage of the first electrode is close to the voltage output from the positive terminal of the external power supply. The second electrode is electrically connected to the negative terminal of the external power supply. Therefore, the voltage of the second electrode is close to the voltage of the negative terminal of the external power supply. If the insulation material of the cable under test is carbonized, the insulation material will break down and form a conductive circuit. This will reduce the voltage difference between the first and second electrodes. Therefore, by comparing the voltage difference between the positive and negative terminals of the external power supply with the actual voltage difference between the first and second electrodes, it is possible to determine whether the cable under test has carbonized.

[0072] In some embodiments, please refer to Figure 9 and Figure 10 The heating unit 5001 includes a heat radiator.

[0073] As an example, Figure 9 This is a schematic cross-sectional view of a conical calorimetric heating element in an insulation material short-circuit testing system provided in this application embodiment. Figure 10 This is a schematic structural diagram of a conical calorimetric heating element in an insulation material short-circuit testing system provided in this application embodiment. The radiator can radiate heat the cable insulation material at different temperatures by changing the radiant heat flux. The radiator may include a start switch 15 for starting the radiator to connect to the power supply, a stop switch 16 for stopping the radiator, and an ignition switch 17 for controlling the radiator to start heating. The radiator has advantages such as uniform heating and fast heating speed.

[0074] This application also provides a method for short-circuit testing of cable insulation materials. Please refer to [link to relevant documentation]. Figure 11 ,include:

[0075] S11: Send a test command, which includes at least a preset applied voltage to the insulation material of the cable under test.

[0076] S12: Apply voltage to the insulation material of the cable under test according to the test command, so that the applied voltage on the insulation material of the cable under test is equal to the preset applied voltage.

[0077] S13: Obtain the actual voltage in the circumferential direction of the cable under test.

[0078] S14: Determine whether the cable under test has carbonized based on the actual voltage.

[0079] The short-circuit test method for cable insulation materials disclosed in this application involves sending a test command, which includes at least a preset applied voltage for the insulation material of the cable under test. A voltage is then applied to the insulation material according to the test command, ensuring that the applied voltage equals the preset applied voltage. This ensures that the cable insulation material is subjected to voltage breakdown testing under the applied preset voltage. Furthermore, the actual voltage along the circumference of the cable under test is obtained, and finally, the presence of carbonization is determined based on the actual voltage. This method allows for timely and accurate identification of carbonization in the cable insulation material based on the actual voltage along the circumference. Furthermore, the applied voltage can be used to determine the breakdown voltage corresponding to carbonization of the cable insulation material, thereby improving the reliability and objectivity of the test results.

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features of the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A carbonization testing system for cable insulation materials, characterized in that, include: The control module is used to send test commands, which include at least a preset applied voltage to the insulation material of the cable under test; The first simulation module is used to apply voltage to the insulation material of the cable under test according to the test command, so that the applied voltage on the insulation material of the cable under test is equal to the preset applied voltage. The input terminal of the first simulation module is electrically connected to the output terminal of the control module. The test module is used to obtain the actual voltage in the circumferential direction of the cable under test, and the input terminal of the test module is electrically connected to the output terminal of the control module. The judgment module is used to determine whether the insulation material of the cable under test has carbonized based on the actual voltage. The input terminal of the judgment module is electrically connected to the output terminal of the test module. Carbonization is caused by the heat generated after leakage current discharges from the surface of the insulating material. The carbonization testing system also includes: The second simulation module is used to change the temperature of the environment in which the insulation material of the cable under test is located according to the test command, so that the temperature of the environment in which the insulation material of the cable under test is located is equal to the preset ambient temperature. The test command also includes the preset ambient temperature of the environment in which the insulation material of the cable under test is located. The input terminal of the second simulation module is electrically connected to the output terminal of the control module.

2. The carbonization testing system for cable insulation materials according to claim 1, characterized in that, The second simulation module includes: A heating unit is used to heat the environment in which the insulation material of the cable under test is located; A temperature measuring unit is used to measure the temperature of the environment in which the insulation material of the cable under test is located. The input terminal of the temperature measuring unit is electrically connected to the output terminal of the control module. A temperature control unit is used to determine whether the temperature of the environment in which the insulation material of the cable under test is located is equal to the preset ambient temperature. If the temperature of the environment in which the insulation material of the cable under test is located is equal to the preset ambient temperature, the heating unit is controlled to stop heating. The input terminal of the temperature control unit is electrically connected to the output terminal of the temperature measuring unit, and the output terminal of the temperature control unit is electrically connected to the input terminal of the heating unit.

3. The carbonization testing system for cable insulation materials according to claim 1, characterized in that, Also includes: The position adjustment module is used to change the test position of the insulation material of the cable under test according to the test command, so that the test position of the insulation material of the cable under test is at the target test position. The test command also includes the target test position of the insulation material of the cable under test. The input terminal of the position adjustment module is electrically connected to the output terminal of the control module.

4. The carbonization testing system for cable insulation materials according to claim 1, characterized in that, The first simulation module includes a first electrode and a second electrode. The first electrode is electrically connected to the positive terminal of an external power supply, and the second electrode is electrically connected to the negative terminal of the external power supply.

5. The carbonization testing system for cable insulation materials according to claim 4, characterized in that, The first electrode includes a stationary electrode, and the second electrode includes a moving electrode, wherein the moving electrode is used to change its position according to the cross-sectional shape of the cable under test.

6. The carbonization testing system for cable insulation materials according to claim 4, characterized in that, The judgment module includes a first end and a second end. The first end is electrically connected to the first electrode, and the second end is electrically connected to the second electrode. The judgment module is used to determine whether the insulation material of the cable under test has carbonized based on the actual voltage difference between the first electrode and the second electrode.

7. The carbonization testing system for cable insulation materials according to claim 6, characterized in that, The judgment module is used to determine whether the insulation material of the cable under test has carbonized based on the relationship between the voltage difference between the positive and negative terminals of the external power supply and the actual voltage difference between the first electrode and the second electrode.

8. The carbonization testing system for cable insulation materials according to claim 2, characterized in that, The heating unit includes a thermal radiator.

9. A method for short-circuit testing of cable insulation material, characterized in that, include: Send a test command, which includes at least a preset applied voltage to the insulation material of the cable under test; According to the test command, a voltage is applied to the insulation material of the cable under test, such that the applied voltage on the insulation material of the cable under test is equal to the preset applied voltage; Obtain the actual voltage in the circumferential direction of the cable under test; Determine whether the cable under test has carbonized based on the actual voltage. Carbonization is caused by the heat generated after leakage current discharges from the surface of the insulating material. The method further includes: The test command changes the temperature of the environment in which the insulation material of the cable under test is located, so that the temperature of the environment in which the insulation material of the cable under test is located is equal to a preset ambient temperature. The test command also includes the preset ambient temperature of the environment in which the insulation material of the cable under test is located.

10. The method according to claim 9, characterized in that, The step of changing the temperature of the environment in which the insulation material of the cable under test is located according to the test command, so that the temperature of the environment in which the insulation material of the cable under test is located is equal to a preset ambient temperature, includes: The environment in which the insulation material of the cable under test is located is heated; Measure the temperature of the environment in which the insulation material of the cable under test is located; Determine whether the temperature of the environment in which the insulation material of the cable under test is located is equal to the preset ambient temperature. If the temperature of the environment in which the insulation material of the cable under test is located is equal to the preset ambient temperature, stop heating.

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