Carbonization test system for cable insulation material

Abstract

The invention relates to a carbonization test system of a cable insulation material, relates to the field of carbonization test of the cable insulation material, and can effectively detect the influence of voltage on carbonization of the cable insulation material, accurately position the breakdown voltage of the cable insulation material and improve the reliability and safety of the cable insulation material. The carbonization test system for the cable insulation material comprises a control module used for sending a test instruction, wherein the test instruction at least comprises a preset external voltage of the insulation material of a to-be-tested cable. The first simulation module is used for applying voltage to the insulating material of the to-be-tested cable according to the test instruction, so that the applied voltage on the insulating material of the to-be-tested cable is equal to the preset applied voltage. The test module is used for acquiring the circumferential actual voltage of the to-be-tested cable. The judgment module is used for judging whether the insulating material of the to-be-detected cable is carbonized or not according to the actual voltage.

Description

Technical Field

[0001] The present application relates to the field of carbonization testing of cable insulation materials, and in particular to a carbonization testing system for cable insulation materials. Background Art

[0002] The insulation material of the cable plays an important role in electrical equipment. The insulation material of the cable can ensure the safe transmission of current and is used to surround the cable to prevent electrical leakage. However, the insulation material of the cable will carbonize after being exposed to high temperature, causing the insulation performance to deteriorate, which in turn causes a short circuit fault. And in the case of a short circuit caused by the carbonization of the insulation material of the cable, it is usually accompanied by the continuous occurrence of electric arcs, which in turn causes the spontaneous combustion of the cable insulation material. The short circuit problem caused by the carbonization of the insulation material of the cable is mainly caused by the discharge of the damaged carbonized insulation under the action of the phase-to-phase voltage.

[0003] At present, in the traditional carbonization test method of cable insulation materials, the test conditions for cable insulation materials are relatively simple, and it is difficult to simulate the carbonization of cables during actual use, which will 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 cable insulation materials, thereby improving the reliability and safety of cable insulation materials.

[0005] To achieve the purpose of this application, this application provides the following technical solutions:

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

[0007] A control module, used for sending a test instruction, wherein the test instruction at least includes a preset applied voltage of an insulating material of the cable to be tested;

[0008] a first simulation module, used for applying a voltage to the insulation material of the cable to be tested according to the test instruction, so that the applied voltage on the insulation material of the cable to be tested is equal to the preset applied voltage, and the input end of the first simulation module is electrically connected to the output end of the control module;

[0009] A test module, used for obtaining the actual voltage in the circumferential direction of the cable to be tested, wherein the input end of the test module is electrically connected to the output end of the control module;

[0010] A judgment module is used to judge whether the insulation material of the cable to be tested is carbonized according to the actual voltage, and the input end of the judgment module is electrically connected to the output end of the test module.

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

[0012] A second simulation module is used to change the temperature of the environment in which the insulating material of the cable to be tested is located according to the test instruction, so that the temperature of the environment in which the insulating material of the cable to be tested is equal to the preset ambient temperature. The test instruction also includes the preset ambient temperature of the environment in which the insulating material of the cable to be tested is located. The input end of the second simulation module is electrically connected to the output end of the control module.

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

[0014] A heating unit, used for heating the environment in which the insulating material of the cable to be tested is located;

[0015] A temperature measuring unit, used to measure the temperature of the environment in which the insulating material of the cable to be tested is located, the input end of the temperature measuring unit being electrically connected to the output end of the control module;

[0016] A temperature control unit is used to determine whether the temperature of the environment in which the insulating material of the cable to be tested is located is equal to the preset ambient temperature. When the temperature of the environment in which the insulating material of the cable to be tested is located is equal to the preset ambient temperature, the heating unit is controlled to stop heating. The input end of the temperature judgment unit is electrically connected to the output end of the temperature measurement unit, and the output end of the temperature control unit is electrically connected to the input end of the heating unit.

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

[0018] A position adjustment module is used to change the test position of the insulating material of the cable to be tested according to the test instruction so that the test position of the insulating material of the cable to be tested is at a target test position. The test instruction also includes the target test position of the insulating material of the cable to be tested. The input end of the position adjustment module is electrically connected to the output end of the control module.

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

[0020] In one embodiment, the first electrode comprises a static electrode, and the second electrode comprises a dynamic electrode, and the dynamic electrode is used to change its position according to the cross-sectional shape of the cable to be tested.

[0021] In one embodiment, 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, and the judgment module is used to judge whether the insulating material of the cable to be tested is 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 judge whether the insulation material of the cable to be tested is carbonized according to the magnitude relationship between the voltage difference between the positive and negative electrodes 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 comprises a heat radiator.

[0024] In a second aspect, the present application provides a method for testing a short circuit of an insulating material of a cable, the method comprising:

[0025] Sending a test instruction, wherein the test instruction at least includes a preset applied voltage of an insulating material of the cable to be tested;

[0026] Applying a voltage to the insulating material of the cable to be tested according to the test instruction so that the applied voltage on the insulating material of the cable to be tested is equal to the preset applied voltage;

[0027] Obtaining the actual voltage in the circumferential direction of the cable to be tested;

[0028] Whether carbonization occurs in the cable to be tested is determined according to the actual voltage.

[0029] The insulation material short-circuit test system and test method of the cable of the present application sends a test instruction through a control module, and the test instruction at least includes a preset external voltage of the insulation material of the cable to be tested. Then, a voltage is applied to the insulation material of the cable to be tested according to the test instruction through the first simulation module, so that the external voltage on the insulation material of the cable to be tested is equal to the preset external voltage, which can ensure that the insulation material of the cable is subjected to a voltage breakdown test when the preset voltage is applied. Further, the actual voltage in the circumferential direction of the cable to be tested is obtained through the test module, and finally, the judgment module is used to judge whether carbonization occurs in the cable to be tested according to the actual voltage. The carbonization of the insulation material of the cable to be tested can be timely and accurately identified according to the actual voltage in the circumferential direction of the cable to be tested, and further, the corresponding breakdown voltage when the insulation material of the cable to be tested is carbonized can be determined through the external voltage on the insulation material of the cable to be tested, thereby improving the reliability and objectivity of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] FIG1 is a schematic structural diagram of an insulating material short circuit testing system provided in an embodiment of the present application;

[0032] FIG2 is a schematic structural diagram of a power supply device in an insulating material short-circuit test system provided in an embodiment of the present application;

[0033] FIG3 is a schematic circuit diagram of a power supply device in an insulating material short-circuit test system provided in an embodiment of the present application;

[0034] Figure 4 is a schematic structural diagram of a test device in an insulating material short-circuit test system provided in an embodiment of the present application;

[0035] FIG5 is a schematic circuit diagram of a test device in an insulating material short-circuit test system provided in an embodiment of the present application;

[0036] FIG6 is a schematic structural diagram of another insulation material short circuit testing system provided in an embodiment of the present application;

[0037] 7 is a schematic structural diagram of a first electrode and a second electrode in an insulating material short circuit test system provided by an embodiment of the present application;

[0038] 8 is a schematic top view of a structure including a first electrode and a second electrode in an insulating material short circuit test system provided by an embodiment of the present application;

[0039] FIG9 is a schematic cross-sectional view of a conical calorimetric heating body in an insulating material short-circuit test system provided in an embodiment of the present application;

[0040] FIG10 is a schematic structural diagram of a conical calorimetric heating body in an insulating material short-circuit test system provided in an embodiment of the present application;

[0041] FIG11 is a schematic flow chart of an insulating material short-circuit testing system provided in real time by the present application.

[0042] Description of Reference Numerals

[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. Test device; 3. Loading device; 4. Current and voltage display device; 5. Load box; 6. Power-on indicator light; 7. Equipment main switch; 8. Control switch; 9. Data acquisition industrial computer; 10. Transformer; 11. First voltmeter; 12. Second voltmeter; 13. Boost button; 14. Lower voltage button; 15. Start switch; 16. Stop switch; 17. Ignition switch; 18. Temperature controller; 19. Conical calorimetric heating body; 20. Static electrode; 21. Support frame; 22. Cable to be tested; 23. Moving electrode; 24. Carrying platform; 25. Connecting rod; 26. Connection fixing point; 27. Adjustment slider; 28. Sliding rod; 29. ​​Stable base; 30. Coupling; 31. Drive motor; 32. High temperature resistant wire. DETAILED DESCRIPTION

[0045] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0047] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that when the terms "consisting of" and / or "comprising" are used in this specification, the presence of the features, integers, steps, operations, elements and / or parts can be determined, but the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups is not excluded. At the same time, when used herein, the term "and / or" includes any and all combinations of the relevant listed items.

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

[0049] However, the insulation material of the cable will carbonize after being subjected to high temperature, causing the insulation performance to deteriorate, which in turn causes a short circuit fault. And when the insulation material of the cable is carbonized and causes a short circuit, it is usually accompanied by the continuous occurrence of electric arcs, which in turn causes the spontaneous combustion of the cable insulation material. The short circuit problem caused by the carbonization of the insulation material of the cable is mainly caused by the breakdown of the damaged carbonized insulation discharge under the action of the phase-to-phase voltage. At present, in traditional technologies, the carbonization test method of the cable insulation material cannot test the effect of voltage on the carbonization of the insulation material, and it cannot accurately determine the critical breakdown voltage of the insulation material of the cable, resulting in the risk of carbonization of the insulation material of the cable due to excessive voltage.

[0050] The embodiment of the present application provides a carbonization test system for cable insulation materials, please refer to FIG1, the carbonization test system for cable insulation materials includes: a control module 100, a first simulation module 200, a test module 300, and a judgment module 400. Among them, the control module 100 is used to send a test instruction, the test instruction at least includes a preset external voltage of the insulation material of the cable to be tested, the first simulation module 200 is used to apply a voltage to the insulation material of the cable to be tested according to the test instruction, so that the external voltage on the insulation material of the cable to be tested is equal to the preset external voltage, and the input end of the first simulation module 200 is electrically connected to the output end of the control module 100. The test module 300 is used to obtain the actual voltage in the circumferential direction of the cable to be tested, and the input end of the test module 300 is electrically connected to the output end of the control module 100. The judgment module 400 is used to judge whether the insulation material of the cable to be tested is carbonized according to the actual voltage, and the input end of the judgment module 400 is electrically connected to the output end of the test module 300.

[0051] Exemplarily, the preset applied voltage is the test voltage of the insulating material of the cable to be tested during the test process, and the preset applied voltage can be freely set according to the actual use scenario of the cable to be tested, etc. When testing the same cable to be tested, the preset applied voltage can include multiple preset applied voltages, and different preset applied voltages can be continuously set until the critical voltage at which carbonization of the cable to be tested occurs is accurately tested.

[0052] It should be noted that when the surface of the cable's insulating material is damp and the electric field is large enough, leakage current will be generated on the surface. The heat generated by the discharge causes local carbonization of the material surface. Since the conductivity of the carbonized product is high, the electric field density here is concentrated on the carbonized part, causing repeated discharges and generating more carbonized products around it, forming a carbonized conductive path that extends toward the electrode, eventually leading to a short circuit.

[0053] Exemplarily, the first simulation module 200 is used to apply voltage to the insulating material of the cable to be tested according to the test instruction, so that the applied voltage on the insulating material of the cable to be tested is equal to the preset applied voltage. In a specific embodiment, please refer to the schematic structural diagram of the power supply device 1 in an insulating material short-circuit test system as shown in Figure 2 and the schematic circuit diagram of the power supply device 1 in an insulating material short-circuit test system in Figure 3. The power supply device 1 can provide voltage for the carbonization test system of the cable insulating material. The power supply device 1 can output the voltage of the power supply and then boost the voltage through the transformer 10 to further supply power to the load box 5. The output voltage value of the power supply device 1 can be changed by changing the power of the load box 5. Specifically, the output voltage value of the power supply device 1 can be set according to actual conditions. For example, the power of the load box 5 in this embodiment is 5KW. More specifically, a high temperature resistant wire 32 can be used as the output wire of the load box 5, and the power supply device 1 can also include a power-on indicator light 6, a main device 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-on indicator light 6 can indicate power-on, and the main device switch 7 is used to start the power supply device 1. The control switch 8 is used to control the output and interruption of the output voltage of the power supply device 1. The first voltmeter 11 is electrically connected to the output end of the load box 5 and is used to measure the output voltage of the load box 5. The boost button 13 and the buck button 14 can adjust the test voltage in real time according to the actual test situation.

[0054] Exemplarily, the test module 300 is used to obtain the actual voltage in the circumferential direction of the cable to be tested. Figure 4 , and a schematic circuit diagram of a short-circuit test system for insulating materials shown in FIG. 5 . The test device 2 may include an ammeter (not shown), a second voltmeter 12, and a current-voltage display device 4. The second voltmeter 12 can measure the actual voltage in the circumference of the cable to be tested, the ammeter can measure the actual current in the circumference of the cable to be tested under the action of the actual voltage, and the current-voltage display device 4 can record the voltage value and current value in the circumference of the cable to be tested at different times to provide current and voltage data for the carbonization test system of the cable insulating material.

[0055] Exemplarily, the judgment module 400 is used to judge whether carbonization occurs in the cable to be tested according to the actual voltage. Specifically, the data acquisition industrial computer 9 shown in FIG. 1 can be used to analyze the carbonization test data of the cable insulation material.

[0056] The insulation material short circuit test system of the cable of the present application sends a test instruction through the control module 100, and the test instruction at least includes a preset external voltage of the insulation material of the cable to be tested. Then, the first simulation module 200 applies a voltage to the insulation material of the cable to be tested according to the test instruction, so that the external voltage on the insulation material of the cable to be tested is equal to the preset external voltage, which can ensure that the insulation material of the cable is subjected to a voltage breakdown test when the preset voltage is applied. Further, the actual voltage in the circumferential direction of the cable to be tested is obtained through the test module 300, and finally, the judgment module 400 is used to judge whether the cable to be tested is carbonized according to the actual voltage. The carbonization of the insulation material of the cable to be tested can be timely and accurately identified according to the actual voltage in the circumferential direction of the cable to be tested, and further, the corresponding breakdown voltage when the insulation material of the cable to be tested is carbonized can be determined by the external voltage on the insulation material of the cable to be tested, thereby improving the reliability and objectivity of the test results.

[0057] In some embodiments, please continue to refer to 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 in which the insulation material of the cable to be tested is located according to the test instruction, so that the temperature of the environment in which the insulation material of the cable to be tested is equal to the preset ambient temperature, and the test instruction also includes the preset ambient temperature of the environment in which the insulation material of the cable to be tested is located, and the input end of the second simulation module 500 is electrically connected to the output end of the control module 100.

[0058] It should be noted that when the electric field is large enough, leakage current will be generated on the surface of the cable's insulation material. The heat generated by the discharge will carbonize the material surface, eventually leading to a short circuit. The influence of temperature on the cable's insulation material is crucial. When the temperature rises, the conductivity of the cable's insulation material increases, causing the resistance value to decrease. Therefore, the carbonization measurement of the cable's insulation material must take temperature as the key variable of measurement to simulate the temperature of the cable in a normal working environment. It can further be combined with the applied voltage of the cable to be tested to jointly determine the conditions for carbonization of the cable's insulation material, thereby improving the diversity and comprehensiveness of the test conditions and the objectivity and reliability of the test results.

[0059] In some embodiments, please continue to refer to Figure 6, the second simulation module 500 includes: a heating unit 5001, used to heat the environment in which the insulating material of the cable to be tested is located; a temperature measuring unit 5002, used to measure the temperature of the environment in which the insulating material of the cable to be tested is located, and the input end of the temperature measuring unit 5002 is electrically connected to the output end of the control module 100; a temperature control unit 5003, used to determine whether the temperature of the environment in which the insulating material of the cable to be tested is equal to the preset ambient temperature. When the temperature of the environment in which the insulating material of the cable to be tested is equal to the preset ambient temperature, the heating unit 5001 is controlled to stop heating, the input end of the temperature judgment unit is electrically connected to the output end of the temperature measurement unit 5002, and the output end of the temperature control unit 5003 is electrically connected to the input end of the heating unit 5001.

[0060] As an example, the heating unit 5001 is used to heat the environment where the insulating material of the cable to be tested is located. Specifically, the schematic structural diagram of an insulating material short-circuit test system as shown in FIG. 7 can be referred to. The conical calorimetric heating body 19 can be used to heat the environment where the insulating material of the cable to be tested is located. The temperature measuring unit 5002 is used to measure the temperature of the environment where the insulating material of the cable to be tested is located. Specifically, the temperature of the environment where the insulating material of the cable to be tested is located can be measured by using a thermometer. It should be noted that the temperature of the environment where the insulating material of the cable to be tested is located can simulate the working environment temperature of the insulating material of the cable to be tested when it is working normally. The temperature control unit 5003 is used to determine whether the temperature of the environment where the insulating material of the cable to be tested is located is equal to the preset ambient temperature. When the temperature of the environment where the insulating material of the cable to be tested is located is equal to the preset ambient temperature, the heating unit 5001 is controlled to stop heating. The temperature control unit 5003 can ensure that the temperature of the environment in which the insulating material of the cable to be tested is located during the test is accurately within the preset ambient temperature range, and provide accurate data support for simulating the working environment temperature of the insulating material of the cable to be tested during normal operation. Specifically, the temperature control unit may include a temperature controller 18.

[0061] In some embodiments, please continue to refer to 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 to be tested according to the test instruction, so that the test position of the insulation material of the cable to be tested is at the target test position, and the test instruction also includes the target test position of the insulation material of the cable to be tested. The input end of the position adjustment module 600 is electrically connected to the output end of the control module 100.

[0062] As an example, the position adjustment module 600 can accurately determine the position of the insulating material of the cable to be tested, and then place the test position of the insulating material of the cable to be tested at the target test position. The test position of the insulating material of the cable to be tested can be adjusted according to the requirements of different test positions of the cable insulating material to ensure the accuracy of the test of the insulating material of the cable to be tested. The position test instruction also includes the target test position of the insulating material of the cable to be tested. The target test position can be set according to actual conditions to detect different positions of the insulating material of the cable.

[0063] In some embodiments, referring to FIG. 7 , the first simulation module 200 includes a first electrode and a second electrode, the first electrode is electrically connected to the positive electrode of the external power source, and the second electrode is electrically connected to the negative electrode of the external power source.

[0064] As an example, after the first electrode is electrically connected to the positive electrode of the external power supply and the second electrode is electrically connected to the negative electrode of the external power supply, the first electrode and the second electrode are used to clamp the cable to be tested along the circumference of the cable to be tested so as to apply a test voltage to the insulating material of the cable to be tested through the first electrode and the second electrode.

[0065] In some embodiments, please continue to refer to FIG. 7 and FIG. 8 , the first electrode includes a static electrode 20 , and the second electrode includes a movable electrode 23 . The movable electrode 23 is used to change its position according to the cross-sectional shape of the cable to be tested.

[0066] As an example, the first electrode can be a static electrode 20, and the position of the static electrode 20 is a fixed position. The second electrode can be a dynamic electrode 23. When the cable to be tested 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 to be tested, so that the cable to be tested can be clamped by the first electrode and the second electrode, thereby fixing the test position of the cable to be tested. In addition, when testing cables with different cross-sectional shapes, the cables to be tested with different cross-sectional shapes can be fixed by changing the position of the second electrode, thereby improving the practicality of the cable insulation material short-circuit test system.

[0067] In a specific embodiment, the insulation material short circuit test system of the cable may further include a carrier 24, a stable base 29, and a support frame 21. The carrier 24 is used to carry the first electrode, the second electrode and the insulation material of the cable to be tested. Specifically, the carrier 24 may be a ceramic carrier. The ceramic carrier has the advantages of high temperature and high pressure resistance and is more conducive to use in a high temperature and high pressure test environment. The support frame 21 is used to support the carrier 24 and may further include a connecting rod 25, a connecting fixed point 26, an adjusting slider 27 and a sliding rod 28. The connecting rod 25 is used to connect the connecting fixed point 26 and the carrier 24. The connection fixing point 26 is used to fix the load-bearing platform 24 so that the load-bearing platform 24 remains stable during the test. The slider 27 is located on the slide bar 28. By adjusting the position of the slider 27, the position of the second electrode can be changed to fix the cables 22 to be tested with different cross-sections. The stable base 29 is located between the load-bearing platform 24 and the support frame 21 to provide a stable load-bearing condition for the load-bearing platform 24. The coupling 30 is used to adjust the position of the slider 27 to send the cable 22 to be tested to the test position for testing the insulating material to be tested. The drive motor 31 is used to drive the coupling 30 to realize the automatic operation of the coupling 30.

[0068] In some embodiments, please continue to refer to 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 judge whether the insulating material of the cable to be tested is carbonized based on the actual voltage difference between the first electrode and the second electrode.

[0069] As an example, when the insulating material of the cable to be tested is not carbonized, there is a voltage difference between the first electrode and the second electrode. When the insulating material of the cable to be tested is carbonized, the voltage difference between the first electrode and the second electrode decreases due to the conduction circuit formed by the insulating material of the cable to be tested. Therefore, the first end of the disconnect module is electrically connected to the first electrode, and the second end is electrically connected to the second electrode, and whether the cable to be tested is carbonized is further determined based on the actual voltage difference between the first electrode and the second electrode.

[0070] In some embodiments, please continue to refer to FIG. 1 , the judgment module 400 is used to judge whether the insulation material of the tested cable is carbonized according to the magnitude relationship between the voltage difference between the positive and negative electrodes of the external power supply and the actual voltage difference between the first electrode and the second electrode.

[0071] As an example, when the insulation material of the cable to be tested is not carbonized, the first electrode is electrically connected to the positive electrode of the external power supply, so the voltage of the first electrode is close to the voltage output by the positive electrode of the external power supply, and the second electrode is electrically connected to the negative electrode of the external power supply, so the voltage of the second electrode is close to the voltage of the negative electrode of the external power supply. In the case that the insulation material of the cable to be tested is carbonized, the voltage difference between the first electrode and the second electrode will decrease because the insulation material is broken down and a conductive circuit is formed. Therefore, the magnitude relationship between the voltage difference between the positive and negative electrodes of the external power supply and the actual voltage difference between the first electrode and the second electrode can be used to determine whether the cable to be tested is carbonized.

[0072] In some embodiments, referring to FIG. 9 and FIG. 10 , the heating unit 5001 includes a heat radiator.

[0073] As an example, FIG9 is a schematic cross-sectional view of a conical calorimetric heating body in an insulating material short-circuit test system provided in an embodiment of the present application, and FIG10 is a schematic structural view of a conical calorimetric heating body in an insulating material short-circuit test system provided in an embodiment of the present application. The heat radiator can achieve radiative heating of the insulating material of the cable at different temperatures by changing the radiant heat flux. The heat radiator may include a start switch 15 for starting the heat radiator so that the heat radiator is connected to a power source, a stop switch 16 for stopping the heat radiator from heating, and an ignition switch 17 for controlling the heat radiator to start heating. The heat radiator has the advantages of uniform heating and fast heating speed.

[0074] The present application also provides a method for testing short circuit of insulation material of a cable, see FIG11 , comprising:

[0075] S11: Send a test instruction, where the test instruction at least includes a preset applied voltage of the insulation material of the cable to be tested.

[0076] S12: applying a voltage to the insulating material of the cable to be tested according to the test instruction, so that the applied voltage on the insulating material of the cable to be tested is equal to a preset applied voltage.

[0077] S13: Obtain the actual voltage in the circumferential direction of the cable to be tested.

[0078] S14: Determine whether carbonization occurs in the cable under test according to the actual voltage.

[0079] The short-circuit test method for the insulation material of the cable of the present application is implemented by sending a test instruction, and the test instruction at least includes a preset external voltage of the insulation material of the cable to be tested. Then, a voltage is applied to the insulation material of the cable to be tested according to the test instruction, so that the external voltage applied on the insulation material of the cable to be tested is equal to the preset external voltage, which can ensure that the insulation material of the cable is subjected to a voltage breakdown test when the preset voltage is applied. Further, by obtaining the actual voltage in the circumferential direction of the cable to be tested, it is finally determined whether carbonization occurs in the cable to be tested based on the actual voltage. The carbonization of the insulation material of the cable to be tested can be timely and accurately identified based on the actual voltage in the circumferential direction of the cable to be tested, and further, the corresponding breakdown voltage when the insulation material of the cable to be tested is carbonized can be determined by the external voltage applied on the insulation material of the cable to be tested, thereby improving the reliability and objectivity of the test results.

[0080] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described 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 above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A carbonization test system for cable insulation materials, characterized in that: include: A control module, used for sending a test instruction, wherein the test instruction at least includes a preset applied voltage of an insulating material of the cable to be tested; a first simulation module, used for applying a voltage to the insulation material of the cable to be tested according to the test instruction, so that the applied voltage on the insulation material of the cable to be tested is equal to the preset applied voltage, and the input end of the first simulation module is electrically connected to the output end of the control module; A test module, used for obtaining the actual voltage in the circumferential direction of the cable to be tested, wherein the input end of the test module is electrically connected to the output end of the control module; A judgment module is used to judge whether the insulation material of the cable to be tested is carbonized according to the actual voltage, and the input end of the judgment module is electrically connected to the output end of the test module.

2. The carbonization test system for cable insulation materials according to claim 1, characterized in that: Also includes: A second simulation module is used to change the temperature of the environment in which the insulating material of the cable to be tested is located according to the test instruction, so that the temperature of the environment in which the insulating material of the cable to be tested is equal to the preset ambient temperature. The test instruction also includes the preset ambient temperature of the environment in which the insulating material of the cable to be tested is located. The input end of the second simulation module is electrically connected to the output end of the control module.

3. The carbonization test system for cable insulation materials according to claim 2, characterized in that: The second simulation module comprises: A heating unit, used for heating the environment in which the insulating material of the cable to be tested is located; A temperature measuring unit, used to measure the temperature of the environment in which the insulating material of the cable to be tested is located, the input end of the temperature measuring unit being electrically connected to the output end of the control module; A temperature control unit is used to determine whether the temperature of the environment in which the insulating material of the cable to be tested is located is equal to the preset ambient temperature. When the temperature of the environment in which the insulating material of the cable to be tested is located is equal to the preset ambient temperature, the heating unit is controlled to stop heating. The input end of the temperature judgment unit is electrically connected to the output end of the temperature measurement unit, and the output end of the temperature control unit is electrically connected to the input end of the heating unit.

4. The carbonization testing system for cable insulation materials according to claim 1, characterized in that: Also includes: A position adjustment module is used to change the test position of the insulating material of the cable to be tested according to the test instruction so that the test position of the insulating material of the cable to be tested is at a target test position. The test instruction also includes the target test position of the insulating material of the cable to be tested. The input end of the position adjustment module is electrically connected to the output end of the control module.

5. 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, wherein the first electrode is electrically connected to the positive electrode of the external power supply, and the second electrode is electrically connected to the negative electrode of the external power supply.

6. The carbonization testing system for cable insulation materials according to claim 5, characterized in that: The first electrode includes a static electrode, and the second electrode includes a dynamic electrode. The dynamic electrode is used to change its position according to the cross-sectional shape of the cable to be tested.

7. The carbonization testing system for cable insulation materials according to claim 5, 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 judge whether the insulating material of the cable to be tested is carbonized based on the actual voltage difference between the first electrode and the second electrode.

8. The carbonization testing system for cable insulation materials according to claim 7, characterized in that: The judgment module is used to judge whether the insulation material of the cable to be tested is carbonized according to the magnitude relationship between the voltage difference between the positive and negative electrodes of the external power supply and the actual voltage difference between the first electrode and the second electrode.

9. The carbonization testing system for cable insulation materials according to claim 3, characterized in that: The heating unit includes a heat radiator.

10. A method for testing short circuit of insulation material of a cable, characterized in that: include: Sending a test instruction, wherein the test instruction at least includes a preset applied voltage of an insulating material of the cable to be tested; Applying a voltage to the insulating material of the cable to be tested according to the test instruction so that the applied voltage on the insulating material of the cable to be tested is equal to the preset applied voltage; Obtaining the actual voltage in the circumferential direction of the cable to be tested; Whether carbonization occurs in the cable to be tested is determined according to the actual voltage.

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