Electro-thermal aging test platform for solid insulating material

Abstract

An electro-thermal aging test platform for a solid insulating material, comprising a voltage regulating system (1), a relay protection apparatus (2), a test apparatus (3), a temperature control system (4), and a timing apparatus (5). The voltage regulating system (1) is configured to output a regulable voltage to the test apparatus (3) by means of the relay protection apparatus (2). The relay protection apparatus (2) is configured to prevent a current from being excessive large. When the current is excessive large, the relay protection apparatus (2) is disconnected. The temperature control system (4) is configured to provide a controllable temperature environment for the test apparatus (3). The timing apparatus (5) is electrically connected to the voltage regulating system (1) and is configured to record a voltage applying time of the voltage regulating system (1). The test apparatus (3) is configured to perform an electro-thermal aging test on a solid insulating material test sample under a given voltage and temperature condition. According to the test platform, the electro-thermal aging test on a solid insulating material under a high temperature and high field strength condition can be implemented, and the disadvantage that the solid insulating material can only be tested under a single factor is overcome.

Description

A solid insulation material electrothermal aging test platform Technical Field

[0001] The present invention relates to the technical field of high-voltage equipment, and in particular to an electric and thermal aging test platform for solid insulating materials. Background Art

[0002] As a crucial component in power systems, dry-type transformers play a critical role in distributing and transmitting electrical energy. The reliability and aging characteristics of their solid insulation materials are crucial for ensuring safe and stable operation of power systems. However, with the increasing demand for higher voltage levels in power equipment, the demand for solid insulation materials for these applications is also rising. However, current solid insulation materials are primarily suitable for low-voltage applications. Furthermore, even in these low-voltage applications, solid insulation materials still face the problem of breakdown. Breakdown events typically occur suddenly, and due to the short duration of the discharge process, the cause of breakdown is difficult to accurately analyze. More seriously, this can lead to fires and explosions in dry-type transformers, posing a serious threat to personnel and equipment safety. Therefore, a comprehensive assessment of the changes in insulation performance of solid insulation materials in high-voltage dry-type transformers over time is crucial.

[0003] Several methods exist for evaluating material aging performance, but these traditional methods have limitations. They typically consider only a single aging factor, such as temperature or voltage, while ignoring the multiple stress factors, such as temperature and voltage, that affect electrical equipment during operation. This approach is insufficient to reflect the performance changes of solid insulation materials under actual operating conditions. The aging characteristics of insulation materials under high-temperature, high-field conditions are still unclear. Therefore, it is urgent to propose and establish a corresponding aging test platform to explore the degradation characteristics of insulation materials under different temperatures and voltages. This can help identify the causes of accidents in critical electrical equipment, such as transformers, operating under high-temperature, high-field conditions, and thus prevent such accidents.

[0004] Summary of the Invention

[0005] The present invention aims to provide an electrothermal aging test platform for solid insulating materials to solve the above technical problems and realize electrothermal aging tests on solid insulating materials under high temperature and high field strength conditions, overcoming the deficiency that solid insulating materials can only be subjected to electrothermal aging tests under a single factor.

[0006] In order to solve the above technical problems, the present invention provides an electrothermal aging test platform for solid insulating materials, comprising a voltage regulating system, a relay protection device, a test device, a temperature control system and a timing device; wherein:

[0007] The voltage regulating system is used to output an adjustable and controllable voltage to the test device via the relay protection device;

[0008] The relay protection device is used to prevent excessive current. When the current is too large, the relay protection device is disconnected;

[0009] The temperature control system is used to provide a controllable temperature environment for the test device;

[0010] The timing device is electrically connected to the voltage regulating system and is used to record the voltage application time of the voltage regulating system;

[0011] The test device is used to perform an electrothermal aging test on a solid insulating material test sample under given voltage and temperature conditions.

[0012] In this scheme, the voltage regulation system provides an adjustable high-voltage signal and, through relay protection, ensures safe testing on the test platform. The temperature control system provides an adjustable temperature for the test device, enabling solid insulation material test samples to undergo electrothermal aging tests under given voltage and temperature conditions, based on the voltage application time reported by the timing device. This platform enables electrothermal aging tests on solid insulation materials under high-temperature, high-field strength conditions, overcoming the limitation that solid insulation materials can only be tested under a single factor.

[0013] Furthermore, the voltage regulation system includes an AC high voltage control console, a transformer, an AC power supply and a control line; wherein:

[0014] The AC high-voltage control console is electrically connected to the low-voltage side of the transformer and is used to adjust and control the output voltage of the transformer;

[0015] The AC high-voltage control console is powered by the AC power supply and is electrically connected to the timing device via the control line;

[0016] The high-voltage side of the transformer outputs an adjustable and controllable voltage to the test device via the relay protection device.

[0017] In the above scheme, the AC high-voltage console is a device that integrates multiple functions such as voltage regulator, measurement unit, control unit, protection, and signal processing. At the same time, the AC high-voltage console has a display screen that can display the total voltage, current, and current values ​​and timing information of each path in real time. By operating the AC high-voltage console, the transformer voltage output can be adjusted and controlled from 0-25kV, so that the required high-voltage signal can be accurately applied to the sample.

[0018] Furthermore, the relay protection device includes a protection resistor, a main relay, and a main circuit breaker; wherein:

[0019] One end of the protection resistor is electrically connected to the high-voltage side of the transformer, and the other end is electrically connected to the main relay; the main relay control end is electrically connected to one end of the main circuit breaker; the other end of the main circuit breaker is electrically connected to the test device;

[0020] The protective resistor is used to limit the short-circuit impact current generated after the test sample breaks down to prevent the current from being too large;

[0021] The main relay is used to control the main circuit breaker to disconnect when the current is greater than a preset threshold.

[0022] In the above scheme, the protective resistor uses a special water resistor, which is a mixture of deionized water and natural water in a ratio of 1:2, with a resistance of 100kΩ. It can limit the short-circuit impact current generated after the sample breaks down, thereby effectively preventing excessive current from damaging the line and equipment. It is connected to the output end of the transformer; the function of the main relay and the main circuit breaker is that when the test sample fails and the current exceeds the preset value, the main relay will be quickly triggered to control the main circuit breaker to disconnect, thereby ensuring the safety of the test on the test platform.

[0023] Furthermore, the temperature control system includes a temperature-regulating oil bath circulation device, a heating belt temperature control device, a heating belt and an oil pipeline; wherein:

[0024] The temperature-controlled oil bath circulation device is connected to the test device via the oil pipeline, and is used to provide oil bath heating for the test device, thereby providing a controllable temperature environment;

[0025] The heating belt control end is electrically connected to the heating belt temperature control device; wherein:

[0026] The heating belt is arranged outside the test device and is used to provide thermal compensation for the test device;

[0027] The heating belt temperature control device is used to adjust the heating temperature of the heating belt.

[0028] Furthermore, the temperature-controlled oil bath circulation device includes a circulating oil bath and a circulating pump. The circulating oil bath is used to provide temperature-controlled insulating oil. The circulating pump pumps the oil into the oil pipeline through the oil outlet of the circulating oil bath. The oil pipeline then delivers the insulating oil to the test device, providing oil bath heating for the test device and thereby maintaining the temperature of the specimen. The oil then flows back into the circulating oil bath through the oil inlet of the circulating oil bath. A heating belt wrapped around the test device is equipped with a heating belt temperature control device to compensate for the heat dissipated by the beaker during the oil bath circulation process, ensuring uniform temperature of the specimens within each test device.

[0029] In the above scheme, the temperature control system can achieve precise adjustment of the insulating oil temperature between 30-300°C, thereby ensuring precise control of the test temperature and helping to maintain a uniform and stable temperature of the specimen in a complex electrothermal aging environment.

[0030] Furthermore, the timing device includes a timer, which is electrically connected to the AC high-voltage control console via the control line and is used to record the voltage application time of the voltage regulation system. The timer has a timing range of 0-9999 hours, ensuring that the time parameters of electrothermal aging can be accurately tracked during the test.

[0031] Furthermore, the relay protection device also includes a branch relay and a branch circuit breaker; there are several test devices, each of which is electrically connected to a protection branch formed by the branch relay and the branch circuit breaker; one end of each protection branch is electrically connected to the main circuit breaker, and the other end is electrically connected to the test device.

[0032] In the above scheme, by setting up several test devices and coordinating with the voltage regulation system and the temperature control system, multi-channel long-term synchronous control under high temperature and high field strength can be achieved, the operating conditions of solid insulation material test samples under actual working conditions can be simulated, and the test results of solid insulation materials under synchronous temperature environment and different voltage environments can be compared. It can further overcome the deficiency that solid insulation materials can only be subjected to electrothermal aging tests under a single factor, and realize the insulation aging test of solid insulation materials under high temperature and high field strength conditions.

[0033] In the above scheme, among multiple groups of branch relays and branch circuit breakers, each group of branch relays corresponds to a branch circuit breaker one by one, and each group of branch relays and branch circuit breakers is connected to a different test device. Its function is that when the sample fails and the current exceeds the preset value, the corresponding branch relay will be quickly triggered to control the branch circuit breaker of the corresponding line to disconnect, thereby isolating the breakdown line from other lines and ensuring the stable operation of the platform.

[0034] Furthermore, the test device includes a double-layer jacket, a beaker and a voltage application module; wherein: the voltage application module is electrically connected to the voltage regulation system through the relay protection device;

[0035] The double-layer jacket is wrapped around the periphery of the beaker, the interior of which is filled with insulating oil and connected to the temperature control system to obtain a controllable temperature environment;

[0036] The voltage applying module is placed in the beaker, and is used to fix the test sample and apply an adjustable and controllable voltage to the test sample, so as to perform an electrothermal aging test on the solid insulation material test sample under given voltage and temperature conditions.

[0037] Furthermore, the beaker is filled with insulating oil, which can effectively prevent surface flashover from occurring on the surface of the solid insulating material test sample.

[0038] Furthermore, the voltage applying module includes a lower electrode, an upper electrode, an upper fixing frame and a lower fixing frame; wherein:

[0039] The upper fixing frame is fixed to the inner wall of the top of the beaker and is used to fix the upper electrode;

[0040] The lower fixing frame is fixed to the inner wall of the bottom of the beaker and is used to fix the lower electrode;

[0041] The lower electrode is grounded, and the upper electrode is electrically connected to the voltage regulating system through the relay protection device;

[0042] The test sample is clamped and fixed by the lower electrode and the upper electrode, and an adjustable and controllable voltage is applied to the test sample to perform an electrothermal aging test on the solid insulating material test sample under given voltage and temperature conditions.

[0043] In the above scheme, the inner cavity of the double-layer jacket is filled with insulating oil. The bottom of the double-layer jacket is provided with a jacket oil inlet, which can be connected to the oil outlet of the circulating oil bath. The top of the double-layer jacket is provided with a jacket oil outlet, which is connected to the oil pipeline. If there are multiple test devices, all test devices can be connected in series through the oil pipeline, that is, oil is fed from the bottom of the double-layer jacket and discharged from the top, forming a circulation of insulating oil around the beaker, realizing oil bath circulation. The lower electrode and the upper electrode are metal cylindrical electrodes, which are fixed inside the beaker by a fixing frame, and the electrodes are connected to the fixing frame by bolts; the fixing frame includes an upper fixing frame and a lower fixing frame, and the upper and lower fixing frames are vertically set to the inner wall of the beaker. The bottom of the upper fixing plate fixes the upper electrode, and the top of the lower fixing plate fixes the lower electrode. The bottom electrode of the upper fixing plate is connected to the relay and the circuit breaker, and the top electrode of the lower fixing plate is grounded by bolts. The insulating sample is placed between the upper and lower metal electrodes, and high voltage can be applied to the sample through the electrodes, thereby realizing a simulated test of the sample under electric and thermal field conditions.

[0044] The above scheme proposes an electrothermal aging test platform for solid insulating materials, which can effectively simulate the accelerated electrothermal aging process of solid insulating materials under high temperature and high field strength, realize the electrothermal aging simulation test of insulating materials at a temperature of 30-300°C and a voltage of 0-25kV, and realize multi-channel synchronous aging at the same time, overcoming the deficiency that insulating materials can only be aged under a single factor. It provides a test environment closer to actual operating conditions for the performance evaluation of insulating materials.

[0045] The test platform requires low cost, light weight, small space, flexible layout, simple operation, accuracy and reliability. It can be widely used in electric and thermal aging tests of solid insulating materials, and provides a basis for the selection and design of insulating materials for electrical equipment under high temperature and high field strength conditions.

[0046] In particular, the test platform proposed in the present invention concentrates the timer and relay protection device on the AC high-voltage control console through a control line, which can not only accurately track the time parameters of electrothermal aging, but also improves the integration and significantly reduces the equipment's footprint; by setting up a temperature control system to heat the sample and selecting suitable insulating oil according to the experimental temperature, the insulation performance of the entire system is improved and the safety of the equipment is enhanced; it is proposed to use a heating belt to temperature compensate the test device, avoiding excessive temperature differences between different beakers due to heat dissipation during the circulation of insulating oil, ensuring that the temperatures between each beaker are basically consistent, and ensuring the accuracy and repeatability of the experiment; in addition, multiple groups of relay protection devices and test devices are set up, which enables electrothermal aging tests of multiple groups of different solid insulating materials to be carried out simultaneously, thereby improving the detection work efficiency.

[0047] In summary, the present invention has a reasonable design and is simple to operate. It overcomes the deficiency that insulating materials can only be subjected to aging tests under a single factor, and realizes the insulation degradation experiment of solid insulating materials under high temperature and high field strength conditions. It can provide technical support and guidance for the insulation structure design and material selection of electrical equipment under high field strength and high temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] FIG1 is a schematic diagram of the architecture of an electrothermal aging test platform for solid insulating materials provided by one embodiment of the present invention;

[0049] FIG2 is a schematic diagram of the actual structure of an electrothermal aging test platform for solid insulating materials provided by one embodiment of the present invention;

[0050] FIG3 is a schematic structural diagram of a test device provided by one embodiment of the present invention;

[0051] Among them: 1. Voltage regulation system; 11. AC high-voltage control console; 12. Transformer; 13. AC power supply; 14. Control line; 2. Relay protection device; 21. Protective resistor; 22. Main relay; 23. Main circuit breaker; 24. Branch relay; 25. Branch circuit breaker; 3. Test device; 31. Double-layer jacket; 311. Jacket oil outlet; 312. Jacket oil inlet; 313. Jacket cavity; 32. Beaker; 33. Lower electrode; 34. Upper electrode; 35. Upper fixing frame; 351. First bolt; 36. Lower fixing frame; 361. Second bolt; 4. Temperature control system; 41. Temperature-controlled oil bath circulation device; 411. Oil outlet; 412. Oil inlet; 42. Heating belt temperature control device; 43. Heating belt; 44. Oil pipeline; 5. Timing device; 51. Timer; 6. Test sample. DETAILED DESCRIPTION

[0052] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0053] As shown in FIG1 , this embodiment provides an electrothermal aging test platform for solid insulating materials, including a voltage regulating system 1, a relay protection device 2, a test device 3, a temperature control system 4, and a timing device 5; wherein:

[0054] The voltage regulating system 1 is used to output an adjustable and controllable voltage to the test device 3 via the relay protection device 2;

[0055] The relay protection device 2 is used to prevent excessive current. When the current is too large, the relay protection device 2 is disconnected;

[0056] The temperature control system 4 is used to provide a controllable temperature environment for the test device 3;

[0057] The timing device 5 is electrically connected to the voltage regulating system 1 and is used to record the voltage application time of the voltage regulating system 1;

[0058] The test device 3 is used to perform an electrothermal aging test on a solid insulating material test sample 6 under given voltage and temperature conditions.

[0059] In this embodiment, voltage regulation system 1 can provide an adjustable high-voltage signal and, through relay protection device 2, ensure safe testing of the test platform. Temperature control system 4 can provide an adjustable temperature for test device 3, so that solid insulating material test sample 6 can undergo electrothermal aging testing in test device 3 under given voltage and temperature conditions, based on the voltage application time reported by timing device 5. This platform implements electrothermal aging testing of solid insulating materials under high-temperature, high-field strength conditions, overcoming the limitation that solid insulating materials can only undergo electrothermal aging testing under a single factor.

[0060] Further, referring to FIG2 , the voltage regulation system 1 includes an AC high voltage control console 11 , a transformer 12 , an AC power supply 13 and a control line 14 ; wherein:

[0061] The AC high-voltage control console 11 is electrically connected to the low-voltage side of the transformer 12 and is used to adjust and control the output voltage of the transformer 12;

[0062] The AC high voltage control console 11 is powered by the AC power supply 13 and is electrically connected to the timing device 5 via the control line 14;

[0063] The high-voltage side of the transformer 12 outputs an adjustable and controllable voltage to the test device 3 via the relay protection device 2 .

[0064] In this embodiment, the AC high-voltage console 11 is a device that integrates multiple functions such as a voltage regulator, a measuring unit, a control unit, protection, and signal processing. At the same time, the AC high-voltage console 11 has a display screen that can display the total voltage, current, and current values ​​and timing information of each path in real time. By operating the AC high-voltage console 11, the voltage output of the transformer 12 can be adjusted and controlled from 0-25kV, so that the required high-voltage signal can be accurately applied to the sample.

[0065] Furthermore, the relay protection device 2 includes a protection resistor 21, a main relay 22, and a main circuit breaker 23; wherein:

[0066] One end of the protection resistor 21 is electrically connected to the high voltage side of the transformer 12, and the other end is electrically connected to the main relay 22; the control end of the main relay 22 is electrically connected to one end of the main circuit breaker 23; the other end of the main circuit breaker 23 is electrically connected to the test device 3;

[0067] The protective resistor 21 is used to limit the short-circuit impact current generated after the test sample 6 breaks down to prevent the current from being too large;

[0068] The main relay 22 is used to control the main circuit breaker 23 to disconnect when the current is greater than a preset threshold.

[0069] In this embodiment, the protective resistor 21 adopts a special water resistor, which is a mixture of deionized water and natural water in a ratio of 1:2, with a resistance of 100kΩ, which can limit the short-circuit impact current generated after the sample breaks down, thereby effectively preventing excessive current from damaging the line and equipment, and is connected to the output end of the transformer 12; the function of the main relay 22 and the main circuit breaker 23 is that when the test sample 6 fails and the current exceeds the preset value, the main relay 22 will be quickly triggered to control the main circuit breaker 23 to disconnect, thereby ensuring the safety of the test on the test platform.

[0070] Furthermore, the temperature control system 4 includes a temperature-regulating oil bath circulation device 41, a heating belt 43, a temperature control device 42, a heating belt 43 and an oil pipeline 44; wherein:

[0071] The temperature-controlled oil bath circulation device 41 is connected to the test device 3 via the oil delivery pipe 44, and is used to provide oil bath heating for the test device 3, thereby providing a controllable temperature environment;

[0072] The control end of the heating belt 43 is electrically connected to the temperature control device 42 of the heating belt 43; wherein:

[0073] The heating belt 43 is arranged outside the test device 3 and is used to provide thermal compensation for the test device 3;

[0074] The temperature control device 42 of the heating belt 43 is used to adjust the heating temperature of the heating belt 43 .

[0075] Furthermore, the temperature-controlled oil bath circulation device 41 includes a circulating oil bath and a circulating pump. The circulating oil bath is used to provide temperature-controlled insulating oil. The circulating pump pumps the oil into the oil delivery pipe 44 through the circulating oil bath's oil outlet 411. The oil delivery pipe 44 delivers the insulating oil to the test device 3, providing oil bath heating for the test device 3 and thereby maintaining the temperature of the specimen. The oil then flows back into the circulating oil bath through the circulating oil bath's oil inlet 412. A heating belt 43 wraps around the test device 3 and is equipped with a heating belt 43 temperature control device 42. This provides temperature compensation for the heat dissipated by the beaker 32 during the oil bath circulation process, ensuring uniform temperature of the specimens within each test device 3.

[0076] In this embodiment, the temperature control system 4 can achieve precise regulation of the insulating oil temperature between 30°C and 300°C, thereby ensuring precise control of the test temperature and helping to maintain a uniform and stable temperature of the sample in a complex electrothermal aging environment.

[0077] Furthermore, the timing device 5 includes a timer 51, which is electrically connected to the AC high-voltage control console 11 via the control line 14 and is used to record the voltage application time of the voltage regulation system 1. The timing range of the timer 51 is 0-9999 hours, which ensures that the time parameters of the electrothermal aging can be accurately tracked during the test.

[0078] Furthermore, the relay protection device 2 also includes a branch relay 24 and a branch circuit breaker 25; there are several test devices 3, and each test device 3 is electrically connected to a protection branch formed by the branch relay 24 and the branch circuit breaker 25; one end of each protection branch is electrically connected to the main circuit breaker 23, and the other end is electrically connected to the test device 3.

[0079] In this embodiment, by setting up several test devices 3, cooperating with the voltage regulating system 1 and the temperature control system 4, multi-channel long-term synchronous control under high temperature and high field strength can be achieved, and the operating conditions of the solid insulation material test sample 6 under actual working conditions can be simulated. By comparing the test results of solid insulation materials under synchronous temperature environment and different voltage environments, it can further overcome the deficiency that solid insulation materials can only be subjected to electrothermal aging tests under a single factor, and realize the insulation aging test of solid insulation materials under high temperature and high field strength conditions.

[0080] In this embodiment, among the multiple groups of branch relays 24 and branch circuit breakers 25, each group of branch relays 24 corresponds to a branch circuit breaker 25 one by one, and each group of branch relays 24 and branch circuit breakers 25 is connected to a different test device 3. Its function is that when the sample fails and the current exceeds the preset value, the corresponding branch relay 24 will be quickly triggered to control the branch circuit breaker 25 of the corresponding line to disconnect, thereby isolating the breakdown line from other lines to ensure the stable operation of the platform.

[0081] Further, referring to FIG3 , the test device 3 includes a double-layer jacket 31 , a beaker 32 and a voltage application module; wherein: the voltage application module is electrically connected to the voltage regulation system 1 through the relay protection device 2 ;

[0082] The double-layer jacket 31 is wrapped around the beaker 32, and its interior is filled with insulating oil and connected to the temperature control system 4 to obtain a controllable temperature environment;

[0083] The voltage applying module is placed in the beaker 32 and is used to fix the test sample 6 and apply an adjustable and controllable voltage to the test sample 6, so as to perform an electrothermal aging test on the solid insulating material test sample 6 under given voltage and temperature conditions.

[0084] Furthermore, the beaker 32 is filled with insulating oil, which can effectively prevent surface flashover from occurring on the surface of the solid insulating material test sample 6 .

[0085] Furthermore, the voltage applying module includes a lower electrode 33, an upper electrode 34, an upper fixing frame 35 and a lower fixing frame 36; wherein:

[0086] The upper fixing frame 35 is fixed to the inner wall of the top of the beaker 32 and is used to fix the upper electrode 34;

[0087] The lower fixing frame 36 is fixed to the inner wall of the bottom of the beaker 32 and is used to fix the lower electrode 33;

[0088] The lower electrode 33 is grounded, and the upper electrode 34 is electrically connected to the voltage regulating system 1 through the relay protection device 2;

[0089] The test sample 6 is clamped and fixed by the lower electrode 33 and the upper electrode 34, and an adjustable and controllable voltage is applied to the test sample 6 to perform an electrothermal aging test on the solid insulating material test sample 6 under given voltage and temperature conditions.

[0090] In this embodiment, the jacket cavity 313 of the double-layer jacket 31 is filled with insulating oil. A jacket oil inlet 312 is provided at the bottom of the double-layer jacket 31, which can be connected to the oil outlet 411 of the circulating oil bath. A jacket oil outlet 311 is provided at the top of the double-layer jacket 31, which is connected to the oil pipeline 44. If there are multiple test devices 3, all of them are connected in series via the oil pipeline 44, i.e., oil enters the bottom of the double-layer jacket 31 and exits the top, forming a circulation of insulating oil around the beaker 32, thus achieving oil bath circulation. The lower electrode 33 and the upper electrode 34 are metal columnar electrodes, which are fixed inside the beaker 32 by a fixing frame, and the electrodes are connected to the fixing frame by bolts; the fixing frame includes an upper fixing frame 35 and a lower fixing frame 36, and the upper and lower fixing frames 36 are vertically set to the inner wall of the beaker 32. The bottom of the upper fixing plate fixes the upper electrode 34, and the top of the lower fixing plate fixes the lower electrode 33. The bottom electrode of the upper fixing plate is connected to the relay and the circuit breaker, and the top electrode of the lower fixing plate is grounded by bolts. The insulating sample is placed between the upper and lower metal electrodes 33, and high voltage can be applied to the sample through the electrodes, thereby realizing a simulated test of the sample under electric and thermal field conditions.

[0091] The solid insulation material electrothermal aging test platform proposed in this embodiment can effectively simulate the accelerated electrothermal aging process of solid insulation materials under high temperature and high field strength, realize electrothermal aging simulation test of insulation materials at temperatures of 30-300°C and voltages of 0-25kV, and simultaneously realize multi-channel synchronous aging, overcoming the deficiency that insulation materials can only be aged under a single factor. It provides a test environment for the performance evaluation of insulation materials that is closer to actual operating conditions.

[0092] At present, in order to simulate the electrothermal environment, it is usually necessary to use a large high-temperature test chamber, which is not only expensive but also occupies a large area. In addition, the test chamber is prone to insulation problems in a high-temperature environment. When the high-voltage lead is introduced, it is easy to cause discharge between the test chamber and the metal cavity, which not only affects the accuracy of the aging test, but also may cause safety hazards. In response to this problem, the solid insulation material electrothermal aging test platform proposed in this embodiment is intended to provide an efficient, controllable and accurate testing environment for the electrothermal aging performance evaluation of solid insulation materials, in order to provide technical support and guidance for the design of insulation structure and material selection of electrical equipment under high temperature and high field strength conditions. The test platform requires low cost, light weight, small space, flexible layout, simple operation, accuracy and reliability, and can be widely used in electrothermal aging tests of solid insulation materials, providing a basis for the selection and design of insulation materials for electrical equipment under high temperature and high field strength conditions.

[0093] In particular, the test platform proposed in the present invention concentrates the timer 51 and the relay protection device 2 on the AC high-voltage control console 11 through the control line 14, which can not only accurately track the time parameters of electrothermal aging, but also improves the integration and significantly reduces the equipment's footprint; by setting up a temperature control system 4 to heat the sample and selecting suitable insulating oil according to the experimental temperature, the insulation performance of the entire system is improved and the safety of the equipment is enhanced; it is proposed to use a heating belt 43 to perform temperature compensation on the test device 3, avoiding excessive temperature differences between different beakers 32 due to heat dissipation during the circulation of the insulating oil, ensuring that the temperatures between the beakers 32 are basically consistent, and ensuring the accuracy and repeatability of the experiment; in addition, multiple groups of relay protection devices 2 and test devices 3 are set up, so that electrothermal aging tests of multiple groups of different solid insulating materials can be carried out simultaneously, thereby improving the detection work efficiency.

[0094] In summary, this embodiment has a reasonable design and simple operation. It overcomes the deficiency that insulating materials can only be aged under a single factor, and realizes the insulation degradation experiment of solid insulating materials under high temperature and high field strength conditions. It can provide technical support and guidance for the insulation structure design and material selection of electrical equipment under high field strength and high temperature conditions.

[0095] In order to further illustrate the technical features of the present invention and highlight its technical advantages, this embodiment provides a ten-channel solid insulation material electrothermal aging test platform, which is mainly composed of a voltage regulating system 1, a ten-channel relay protection device 2, a ten-channel test device 3, a temperature control system 4 and a timing device 5.

[0096] The voltage regulation system 1 consists of an AC high-voltage control console 11 and a withstand voltage transformer 12. The withstand voltage transformer 12 is connected to the AC high-voltage control console 11 on its low-voltage side and to the relay protection device 2 on its high-voltage side. The AC high-voltage control console 11 integrates multiple functions, including a voltage regulator, a measurement unit, a control unit, protection, and signal processing. It is connected to an AC power source 13 and connected to various circuits via control lines 14. The display on the AC high-voltage control console 11 can display the total voltage, current, and current values ​​and timing information for each circuit in real time. By regulating the voltage of the AC high-voltage control console 11, the voltage output of the transformer 12 can be adjusted and controlled from 0 to 25 kV, thereby accurately applying the required high-voltage signal to the test specimen.

[0097] The ten-channel relay protection device 2 consists of a protective resistor 21, ten sets of current relays, and corresponding circuit breakers. The protective resistor 21 uses a special water resistor to limit the short-circuit surge current generated after the sample breaks down, thereby effectively preventing excessive current from damaging the lines and equipment. It is connected to the output end of the transformer 12; the main relay 22 and the main circuit breaker 23 can effectively prevent the total current from being too large and damaging the lines and equipment. Among the ten sets of branch relays 24 and branch circuit breakers 25, each set of branch relays 24 corresponds to a branch circuit breaker 25, and each set of branch relays 24 and branch circuit breakers 25 is connected to a different electrode. Its function is that when the sample fails and the current exceeds the preset value, the corresponding relay will be quickly triggered, controlling the circuit breaker of the corresponding line to open, thereby isolating the broken line from the other lines and ensuring the stable operation of the system.

[0098] The ten-channel test device 3 is composed of ten sets of double-layer jackets 31, beakers 32, lower electrodes 33, upper electrodes 34, upper fixing frames 35 and lower fixing frames 36. Insulating oil is filled in the jacket cavities 313 of the ten double-layer jackets 31 and the beakers 32. The jacket oil inlet 312 at the top of the beaker 32 is connected to the jacket oil inlet 312 at the bottom of the next beaker 32. Oil is fed from the bottom so that insulating oil with a preset temperature fills the jacket cavity 313, ensuring that the beakers 32 are heated evenly. The ten beakers 32 are connected in series to realize the circulation of the oil bath and the heating of the internal insulating oil. The upper electrode 34 and the lower electrode 33 are both metal cylindrical electrodes, which are fixed inside the beaker 32 through the upper fixing frames 35 and the lower fixing frames 36. The upper fixing frames 35 and the lower fixing frames 36 are vertically arranged to the beaker 32. The inner wall of the cup 32 and the top of the lower fixing frame 36 are connected to the lower electrode 33 and fixed with a second bolt 361. The bottom of the upper fixing plate is connected to the upper electrode 34 and fixed with a second bolt 361. In addition, the second bolt 361 is connected to the high-voltage line, and the first bolt 351 is connected to the ground wire. The internal cavity of the beaker 32 is filled with insulating oil. The internal insulating oil can effectively prevent surface flashover from occurring on the surface of the sample. At the same time, the test sample 6 is placed between the metal upper electrode 34 and the lower electrode 33. High voltage can be applied to the sample through the electrodes, thereby realizing a simulated test of the sample under electric and thermal field conditions.

[0099] The temperature control system 4 is composed of a temperature-regulating oil bath circulation device 41 , a temperature control device 42 , an oil delivery pipe 44 and a heating belt 43 . The temperature-controlled oil bath circulation device 41 consists of a circulating oil bath pot and a circulating pump. The oil outlet 411 of the circulating oil bath pot is connected to the jacket oil inlet 312, and the oil inlet 412 is connected to the jacket oil outlet 311. The insulating oil in the jacket cavity 313 can be circulated through the circulating pump and the oil pipe 44. The insulating oil inside the beaker 32 is heated by the circulating insulating oil, thereby maintaining the temperature of the sample; the temperature control device 42 is electrically connected to the control end of the heating belt 43 for adjusting the heating temperature of the heating belt 43; the heating belt 43 is wrapped around the outer wall of the beaker 32 and is provided with a jacket cavity 313. The temperature of the heating belt 43 can be adjusted to achieve temperature compensation for the heat dissipation of the beaker 32 during the oil bath circulation process, so as to ensure that the temperature of the samples in each beaker 32 remains uniform; the temperature control device can achieve precise adjustment of the temperature of the insulating oil between 30-300°C, thereby ensuring precise control of the test temperature, which helps to maintain a uniform and stable temperature of the sample in a complex electrothermal aging environment.

[0100] The timing device 5 includes ten groups of timing devices 5, which are integrated into the AC high-voltage console 11 through the control line 14. The timing range is 0-9999h, which can record the time when the voltage is applied to the sample, ensuring that the time parameters of electrothermal aging can be accurately tracked during the test.

[0101] This embodiment relates to a ten-channel solid insulation material electrothermal aging test platform, which can realize multi-channel synchronous simulation of the electrothermal accelerated aging process of solid insulation materials under high field strength and high temperature conditions, making the aging process more consistent with the actual situation and improving the accuracy of experimental data. It can overcome the deficiency that existing insulation materials can only be aged under a single factor. It can provide technical support and guidance for the insulation structure design and material selection of electrical equipment under high field strength and high temperature conditions.

[0102] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A solid insulation material electric thermal aging test platform, characterized in that: It comprises a voltage regulating system (1), a relay protection device (2), a test device (3), a temperature control system (4) and a timing device (5); wherein: The voltage regulating system (1) is used to output an adjustable and controllable voltage to the test device (3) via the relay protection device (2); The relay protection device (2) is used to prevent excessive current. When the current is too large, the relay protection device (2) is disconnected; The temperature control system (4) is used to provide a controllable temperature environment for the test device (3); The timing device (5) is electrically connected to the voltage regulating system (1) and is used to record the voltage application time of the voltage regulating system (1); The test device (3) is used to carry out an electrothermal aging test on a solid insulating material test sample under given voltage and temperature conditions.

2. The solid insulation material electric thermal aging test platform according to claim 1, characterized in that: The voltage regulation system (1) comprises an AC high voltage control console (11), a transformer (12), an AC power source (13) and a control line (14); wherein: The AC high-voltage control console (11) is electrically connected to the low-voltage side of the transformer (12) and is used to adjust and control the output voltage of the transformer (12); The AC high-voltage control console (11) is powered by the AC power source (13) and is electrically connected to the timing device (5) via the control line (14); The high voltage side of the transformer (12) outputs an adjustable and controllable voltage to the test device (3) via the relay protection device (2).

3. The solid insulation material electric thermal aging test platform according to claim 2, characterized in that: The relay protection device (2) comprises a protection resistor (21), a main relay (22), and a main circuit breaker (23); wherein: One end of the protection resistor (21) is electrically connected to the high voltage side of the transformer (12), and the other end is electrically connected to the main relay (22); the control end of the main relay (22) is electrically connected to one end of the main circuit breaker (23); the other end of the main circuit breaker (23) is electrically connected to the test device (3); The protective resistor (21) is used to limit the short-circuit impact current generated after the test sample breaks down, preventing The current is too large; The main relay (22) is used to control the main circuit breaker (23) to disconnect when the current is greater than a preset threshold.

4. The solid insulation material electric thermal aging test platform according to claim 1, characterized in that: The temperature control system (4) comprises a temperature-regulating oil bath circulation device (41), a heating belt temperature control device (42), a heating belt (43) and an oil pipeline (44); wherein: The temperature-adjusting oil bath circulation device (41) is connected to the test device (3) via the oil delivery pipe (44) and is used to provide oil bath heating for the test device (3) and provide a controllable temperature environment; The control end of the heating belt (43) is electrically connected to the heating belt temperature control device (42); wherein: The heating belt (43) is arranged outside the test device (3) and is used to provide thermal compensation for the test device (3); The heating belt temperature control device (42) is used to adjust the heating temperature of the heating belt (43).

5. The solid insulation material electric thermal aging test platform according to claim 4, characterized in that: The temperature-adjusting oil bath circulation device (41) comprises a circulating oil bath pot and a circulating pump. The circulating oil bath pot is used to provide temperature-controllable insulating oil, and the circulating pump pumps the insulating oil into the oil delivery pipe (44) through the oil outlet (411) of the circulating oil bath pot. The insulating oil is transported to the test device (3) through the oil delivery pipe (44) to provide oil bath heating for the test device (3), and finally flows back to the circulating oil bath pot through the oil inlet (412) of the circulating oil bath pot.

6. The solid insulation material electric thermal aging test platform according to claim 2, characterized in that: The timing device (5) comprises a timer (51), and the timer (51) is electrically connected to the AC high-voltage control console (11) via the control line (14) and is used to record the voltage application time of the voltage regulating system (1).

7. A solid insulation material electric thermal aging test platform according to any one of claims 1 to 6, characterized in that: The relay protection device (2) further comprises a branch relay (24) and a branch circuit breaker (25); a plurality of the test devices (3) are provided, and each test device (3) is electrically connected to a protection branch formed by the branch relay (24) and the branch circuit breaker (25); one end of each protection branch is electrically connected to the main circuit breaker (23), and the other end is electrically connected to the test device (3).

8. The solid insulation material electric thermal aging test platform according to claim 7, characterized in that: The test device (3) comprises a double-layer jacket (31), a beaker (32) and a voltage application module; wherein: the voltage application module is electrically connected to the voltage regulation system (1) through the relay protection device (2); The double-layer jacket (31) is wrapped around the periphery of the beaker (32), the interior of which is filled with insulating oil and connected to the temperature control system (4) to obtain a controllable temperature environment; The voltage application module is placed in the beaker (32) and is used to fix the test sample and apply an adjustable and controllable voltage to the test sample, so as to perform an electrothermal aging test on the solid insulating material test sample under given voltage and temperature conditions.

9. The solid insulation material electric thermal aging test platform according to claim 8, characterized in that: The beaker (32) is filled with insulating oil.

10. The solid insulation material electric thermal aging test platform according to claim 8, characterized in that: The voltage application module comprises a lower electrode (33), an upper electrode (34), an upper fixing frame (35) and a lower fixing frame (36); wherein: The upper fixing frame (35) is fixed to the inner wall of the top of the beaker (32) and is used to fix the upper electrode (34); The lower fixing frame (36) is fixed to the inner wall of the bottom of the beaker (32) and is used to fix the lower electrode (33); The lower electrode (33) is grounded, and the upper electrode (34) is electrically connected to the voltage regulating system (1) through the relay protection device (2); The test sample is clamped and fixed by the lower electrode (33) and the upper electrode (34), and an adjustable and controllable voltage is applied to the test sample to perform an electrothermal aging test on the solid insulating material test sample under given voltage and temperature conditions.

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