Nondestructive testing method and testing system for microcrack form of carbon ceramic resistor under transient energy injection

Abstract

The invention discloses a nondestructive testing method and a testing system for the microcrack form of a carbon ceramic resistor under transient energy injection. The testing system comprises a controllable high-voltage direct-current charging power supply, a transient energy discharging unit, the carbon ceramic resistor, a control unit and a microcrack detection unit, a carbon ceramic resistor microcrack monitoring system is established, generation and development evolution process tests of microcracks in a ceramic body of the carbon ceramic resistor under transient energy injection are carried out, the microcrack form, the change rule and the expected life of the carbon ceramic resistor are finally obtained, and data support is provided for life prediction, model selection and safe operation of the closing resistor of the circuit breaker.

Description

Technical Field

[0001] This invention relates to a transient energy withstand test method for power equipment or devices, and particularly to a non-destructive testing method and system for detecting microcrack morphology in carbon ceramic resistors under transient energy injection. Background Technology

[0002] With the development of ultra-high voltage power transmission technology in my country, carbon ceramic resistors are widely used in 330kV and above transmission lines to limit overvoltage generated during the closing process of high voltage circuit breakers and suppress arc reignition. They are the core protection for the development of ultra-high voltage and extra-high voltage power transmission and transformation equipment.

[0003] Carbon-ceramic linear resistors are a challenging technology in current power transmission systems. my country's high-voltage transmission lines rely entirely on imports for the carbon ceramic resistors used in circuit breakers. While research into the fabrication of carbon-ceramic linear resistors has begun in my country, no substantial technological breakthroughs have been achieved, and high-voltage testing technology remains a foreign field.

[0004] During circuit breaker closing, the absorption of transient energy from the transmission line by the closing resistor is a crucial test item. Whether the carbon ceramic resistor will develop micro-cracks or even explode after absorbing large amounts of transient energy is a primary concern for the safe operation of the circuit breaker. During transient energy withstand tests of carbon ceramic resistors, the entire carbon ceramic resistor element frequently explodes. However, the mechanism of this explosion is unclear, making it impossible to provide guidance for the selection of carbon ceramic resistors for transmission line circuit breakers, or for optimizing the formulation, molding, and sintering processes of the carbon ceramic resistor's ceramic body. Therefore, this study investigates non-destructive testing methods and systems for microcracks in carbon ceramic resistors under transient energy injection. The experiment analyzes the generation, development, and evolution of microcracks within the ceramic body of the carbon ceramic resistor under transient energy injection. Through monitoring and analysis of initial new carbon ceramic resistors and the internal ceramic cracks after a fixed transient energy injection, the generation, development, and evolution of microcracks in carbon ceramic resistors under transient energy injection are obtained. Ultimately, the morphology, variation patterns, and expected lifespan of the microcracks in the carbon ceramic resistor are determined, providing data support for the prediction, selection, and safe operation of circuit breaker closing resistors. Summary of the Invention

[0005] To address the problems existing in the prior art, the purpose of this invention is to provide a non-destructive testing method and system for microcrack morphology detection of carbon ceramic resistors under transient energy injection, obtaining the microcrack morphology, variation law, and expected life of the carbon ceramic resistors, providing data support for the life prediction, selection, and safe operation of circuit breaker closing resistors.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A non-destructive testing system for microcrack morphology of carbon ceramic resistors under transient energy injection includes a controllable high-voltage DC charging power supply, a transient energy discharge unit, a carbon ceramic resistor, a control unit, and a microcrack detection unit; The controllable DC high-voltage charging power supply is used to charge the energy storage capacitor C in the transient energy discharge unit, and controls the transient / pulse current waveform parameters output by the transient energy discharge unit by the magnitude of the charging voltage, thereby realizing the magnitude of transient energy applied to the carbon ceramic resistor. The transient energy discharge unit includes an energy storage capacitor C, a discharge switch G, a waveform forming inductor L, and a waveform forming resistor R. By adjusting the capacitance value of the energy storage capacitor, the value of the forming inductor, and the value of the resistor, the transient energy injected into the carbon ceramic resistor reaches a preset value. The control unit includes a programmable controller and a charging voltage monitoring circuit. The charging voltage monitoring circuit monitors the charging voltage across the energy storage capacitor C online and provides a discharge control signal to the discharge switch G when the charging voltage reaches the preset discharge voltage. The microcrack detection unit mainly includes a transient energy measurement unit, a microcrack imaging scanner, and a computer measurement and control data processing unit. The transient energy measurement unit, in conjunction with the computer measurement and control data processing unit, obtains the energy absorbed by the carbon ceramic resistor through current and the integration of current with time. The microcrack imaging scanner is used to obtain microscopic microcrack images inside the carbon ceramic resistor. After analysis and processing by the computer measurement and control data processing unit, the microscopic features inside the carbon ceramic resistor under transient energy injection are obtained. The computer measurement and control data processing unit is used to control the automatic execution of the transient energy withstand test of the carbon ceramic resistor and the microscopic morphology features inside the carbon ceramic resistor under transient energy injection. By controlling the adjustable high-voltage charging power supply through the computer measurement and control data processing unit and control unit, different transient energies are injected into the carbon ceramic resistor. The micro-crack detection unit is used to detect the internal micro-morphological characteristics of the carbon ceramic resistor. By progressively increasing the transient energy injection, the computer measurement and control data processing unit analyzes the internal micro-morphology of the carbon ceramic resistor to obtain the variation law of the internal micro-morphology of the carbon ceramic resistor, as well as the law between the occurrence, development and evolution of micro-cracks inside the ceramic body and the injected transient energy.

[0007] Preferably, the transient energy measurement unit includes a pulse voltage divider, a pulse current sensor, and an oscilloscope; the pulse voltage divider measures the transient voltage across the carbon ceramic resistor, the pulse current sensor measures the transient current flowing through the carbon ceramic resistor, and the oscilloscope transmits the pulse voltage and pulse current signals to the computer measurement and control data processing unit to obtain the energy absorbed by the carbon ceramic resistor through the current and the integration of the current with respect to time.

[0008] Preferably, the microcrack imaging scanner is an X-ray micro-CT scanner or a tomographic thermal imaging scanner, which detects and obtains micro-crack images inside the carbon ceramic resistive ceramic body. The micro-crack images inside the carbon ceramic resistive ceramic body are analyzed and processed by a computer measurement and control data processing unit to obtain the micro-characteristics of the carbon ceramic ceramic body under transient energy injection.

[0009] Preferably, the computer measurement and control data processing unit includes an industrial control computer and its dedicated data management software, and is also used to automatically monitor the charging process of the transient energy test for non-destructive testing of carbon ceramic resistor microcracks; cooperate with the programmable controller to automatically control the transient energy test process; realize waveform data processing of transient energy test and image scanning analysis of carbon ceramic resistor microcrack morphology; and record, store, query and output test reports of carbon ceramic resistor transient energy test signals and images.

[0010] A non-destructive testing method for transient energy withstand threshold of carbon ceramic resistance in microcrack detection, characterized by the following steps: 1) Set the discharge voltage or expected transient energy value of the transient energy discharge unit; 2) The computer measurement and control data processing unit and the control unit work together to control the transient energy discharge unit by controlling the controllable DC high voltage charging power supply through the programmable controller and the charging voltage monitoring circuit. The system automatically tracks the real-time state of the charging voltage across the energy storage capacitor C. When the charging voltage across the energy storage capacitor C reaches the preset discharge voltage, the system automatically sends a control pulse to the discharge switch G of the transient energy discharge unit, causing it to break down and discharge, injecting the specified transient energy into the carbon ceramic closing resistor. 3) Use a pulse voltage divider, a pulse current sensor, and an oscilloscope to measure the transient voltage across the carbon ceramic resistor and the transient current flowing through the carbon ceramic resistor, respectively; calculate the transient energy injected into the carbon ceramic resistor through communication between the oscilloscope and the computer and through calculations by the computer measurement and control data analysis and management software. 4) Use a microcrack imaging scanner to detect the internal microstructure of the carbon ceramic resistor. Through image analysis by the computer measurement and control data analysis unit, determine whether there are microcracks inside the carbon ceramic resistor. If not, increase the charging voltage of the controllable DC high voltage charging power supply to achieve a gradient increase in the transient energy of the carbon ceramic resistor until obvious microcracks appear inside the carbon ceramic resistor. 5) Repeat steps 1) to 4) to obtain a series of transient energy values ​​and image data of microcracks and their propagation inside the carbon ceramic resistor body. Analyze the energy threshold that the carbon ceramic resistor can withstand, as well as the correlation between the development and evolution of microcracks in the carbon ceramic resistor and the injected transient energy. Preferably, based on the transient energy that the carbon ceramic resistor needs to withstand during the actual closing process, steps 1) to 4) are repeated. By analyzing the transient energy value and the image data of the microcracks inside the carbon ceramic resistor and their propagation, the development and evolution law of the microcracks in the carbon ceramic resistor and the expected life of the carbon ceramic resistor are obtained.

[0011] Compared with the prior art, the present invention has at least the following beneficial effects: This invention addresses the testing of transient energy performance of carbon ceramic resistors in UHV transmission systems and the application requirements for selecting carbon ceramic resistors for circuit breakers in different application scenarios. It proposes a non-destructive testing method and system for detecting microcrack morphology in carbon ceramic resistors under transient energy injection. A microcrack monitoring system for carbon ceramic resistors is established, and experiments are conducted on the generation, development, and evolution of microcracks within the ceramic body of the carbon ceramic resistor under transient energy injection. Ultimately, the microcrack morphology, variation patterns, and expected lifespan of the carbon ceramic resistor are obtained, providing data support for the prediction, selection, and safe operation of circuit breaker closing resistors.

[0012] Non-contact, high-sensitivity X-ray micro-CT or tomographic thermography scanning non-destructive testing methods, combined with computer image processing and recognition capabilities, are used to achieve dynamic monitoring and analysis of the microcrack evolution process of carbon ceramic resistors. By monitoring and analyzing the initial new carbon ceramic resistors and the internal ceramic cracks of carbon ceramic resistors after the injection of fixed transient energy, the generation, development, and evolution process of microcracks in carbon ceramic resistors under transient energy injection is obtained, and finally the microcrack morphology, variation law, and expected life of carbon ceramic resistors are obtained.

[0013] This invention provides a non-destructive testing method for microcrack morphology of carbon ceramic resistors under transient energy injection. It obtains the dynamic evolution process of microcracks inside the carbon ceramic resistor body under multiple transient energy injections, analyzes the correlation between thermal cracking and microcrack propagation and morphology of carbon ceramic resistors, and thereby obtains the expected life of carbon ceramic resistors under transient energy. It can be used in similar scenarios such as transient energy tolerance tests of composite media in the power and communication fields. Attached Figure Description

[0014] Figure 1 This is a structural block diagram of the non-destructive testing system for microcrack morphology of carbon ceramic resistors under transient energy injection according to the present invention; Figure 2 This is a schematic diagram of the transient energy discharge unit of the present invention; Figure 3 This is a schematic diagram of the microcrack imaging scanner of the present invention; Figure 4 This invention provides a non-destructive testing method for the internal microcrack morphology of transient energy carbon ceramic resistive ceramic bodies and a flowchart for testing transient energy tolerance. Figure 5This invention relates to a non-destructive testing method for the internal microcrack morphology of transient energy carbon ceramic resistors and a flowchart for lifetime prediction testing. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to specific embodiments, but this is not intended to limit the present invention.

[0016] See Figure 1 , Figure 2 , Figure 3 The present invention provides a non-destructive testing system for microcrack morphology of carbon ceramic resistors under transient energy injection, which mainly consists of a controllable high-voltage DC charging power supply 1, a transient energy discharge unit 2, a carbon ceramic resistor 3, a control unit 4, and a microcrack detection unit 5.

[0017] The controllable DC high-voltage charging power supply 1 consists of an adjustable DC high-voltage power supply (DC) and a current-limiting resistor (R). Its function is to charge the energy storage capacitor (C) in the transient energy discharge unit 2, and to control the transient / pulse current waveform parameters output by the transient energy discharge unit 2 by controlling the magnitude of the charging voltage, thereby controlling the magnitude of the transient energy applied to the carbon ceramic resistor 3. The charging process or the amplitude of the charging voltage is jointly controlled by the computer measurement and control data processing unit 53 and the control unit 4.

[0018] The transient energy discharge unit 2 mainly includes an energy storage capacitor C, a discharge switch G, a waveform forming inductor L, and a waveform forming resistor R. The transient energy discharge unit generates a lightning impulse voltage waveform that meets standard requirements. The charged energy storage capacitor discharges through the discharge switch, waveform forming inductor, and waveform forming resistor R onto the carbon ceramic resistor, thereby generating a transient energy voltage and injecting it into the carbon ceramic resistor. Furthermore, the parameters of the energy storage capacitor C, waveform forming inductor L, and waveform forming resistor R can be adjusted according to the load Zr. By adjusting the capacitance value of the energy storage capacitor, the forming inductor, and the resistor value, the duration or half-peak time of the current flowing through carbon ceramic resistors 3 with different resistance values ​​is kept within a specified range. This half-peak time should coincide with the circuit breaker closing time, and the transient energy injected into the carbon ceramic resistor 3 reaches a preset value.

[0019] The control unit 4 mainly includes a programmable controller 4-1 and a charging voltage monitoring circuit 4-2. The charging voltage monitoring circuit 4-2 can monitor the charging voltage across the energy storage capacitor C online and issue a discharge control signal to the discharge switch G when the charging voltage reaches the preset discharge voltage.

[0020] The microcrack detection unit 5 mainly includes a transient energy measurement unit 51, a microcrack imaging scanner 52, and a computer-controlled data processing unit 53. Among them: The transient energy measurement unit 51 consists of a pulse voltage divider 51-1, a pulse current sensor 51-2, and an oscilloscope 51-3. The pulse voltage divider 51-1 measures the transient voltage across the carbon ceramic resistor 3, the pulse current sensor 51-2 measures the transient current flowing through the carbon ceramic resistor 3, and the oscilloscope 51-3 transmits the pulse voltage and pulse current signals to the computer measurement and control data processing unit 53. By integrating the current and the current over time, the energy absorbed by the carbon ceramic resistor can be calculated.

[0021] The microcrack imaging scanner 52 can be an X-ray micro-CT scanner or a tomographic thermal imaging scanner. The micro-crack images inside the carbon ceramic resistive ceramic body obtained by the X-ray micro-CT scanner or tomographic thermal imaging scanner can be analyzed and processed by the computer measurement and control data processing unit to obtain the micro-features inside the carbon ceramic resistive ceramic body under transient energy injection.

[0022] The computer-controlled data processing unit 53 mainly includes an industrial control computer and its dedicated data management software. Its main functions are to automatically control the transient energy withstand test process of carbon ceramic resistors, measure and calculate transient energy, and acquire and analyze the microscopic morphology characteristics of the carbon ceramic body under transient energy injection. It is mainly used for: ① automatically monitoring the charging process of the transient energy test for non-destructive testing of microcracks in carbon ceramic resistors; ② automatically controlling the transient energy test process in conjunction with the programmable logic controller 4-1; ③ realizing waveform data processing of transient energy tests and image scanning analysis of microcrack morphology in carbon ceramic resistors; ④ recording, storing, querying, and outputting test reports of transient energy test signals and images of carbon ceramic resistors.

[0023] See Figure 4 , Figure 5 As shown, the present invention provides a non-destructive testing method for microcrack morphology of carbon ceramic resistors under transient energy injection. This method utilizes a computer-controlled data processing unit and a control unit to control an adjustable high-voltage charging power supply, thereby regulating the voltage of the energy storage capacitor in the transient energy discharge unit. This allows for the injection of different transient energies into the carbon ceramic resistor. An X-ray micro-CT scanner or a computed tomography scanner is used to detect the internal microstructure of the carbon ceramic resistor. By progressively increasing the transient energy injection or using fixed energy and repeated transient energy injection, the computer-controlled data processing unit analyzes the internal microstructure of the carbon ceramic resistor to obtain the variation law of its internal microstructure, as well as the relationship between the occurrence, development, and evolution of microcracks within the ceramic body and the injected transient energy. This determines the correlation between the cracking of the carbon ceramic resistor and the microcrack morphology, thus enabling the prediction of the lifespan of the carbon ceramic resistor under transient energy injection.

[0024] The detailed measurement flowchart is as follows: 1) Start the operation of the non-destructive testing system software for microcracks in the internal ceramic body of carbon ceramic resistors under transient energy injection.

[0025] 2) Set the discharge voltage or expected transient energy value of transient energy discharge unit 2.

[0026] 3) The computer measurement and control data processing unit 53 and the control unit 4 work together to control the transient energy discharge unit 2 by using the programmable controller 4-1 and the charging voltage monitoring circuit 4-2. The controllable high voltage DC charging unit 1 charges the energy storage capacitor C of the transient energy discharge unit 2 and can automatically track the real-time state of the charging voltage across the energy storage capacitor C. When the charging voltage across the energy storage capacitor C reaches the preset discharge voltage, the control pulse is automatically sent to the discharge switch G of the transient energy discharge unit 2 to break down and discharge, injecting the specified transient energy into the carbon ceramic closing resistor.

[0027] 4) Use a pulse voltage divider 51-1, a pulse current sensor 51-2, and an oscilloscope 51-3 to measure the transient voltage across the carbon ceramic resistor 3 and the transient current flowing through the carbon ceramic resistor 3, respectively; through communication between the oscilloscope 51-3 and the computer, and through calculations by the computer's measurement and control data analysis and management software, accurately calculate the transient energy injected into the carbon ceramic resistor 3.

[0028] 5) The microscopic morphology of the carbon ceramic resistor 3 is detected using an X-ray micro-CT scanner or a computed tomography scanner. Image analysis by the computer-controlled data analysis unit 53 determines whether microcracks have formed inside the carbon ceramic resistor. If not, the charging voltage of the controllable high-voltage DC charging unit 1 is increased to achieve a gradient increase in the transient energy of the carbon ceramic resistor until obvious microcracks appear inside the carbon ceramic resistor.

[0029] 6) Repeat steps 2) to 5) to obtain a series of transient energy values ​​and image data of microcracks and their propagation inside the carbon ceramic resistor 3. Analyze the energy threshold that the carbon ceramic resistor can withstand, as well as the correlation between the development and evolution of microcracks in the carbon ceramic resistor and the injected transient energy.

[0030] In addition, based on the transient energy that the carbon ceramic resistor 3 needs to withstand during the actual closing process, steps 2) to 5) can be repeated. By analyzing the transient energy value and the image data of the microcracks inside the carbon ceramic resistor 3 and their expansion, the development and evolution law of the microcracks in the carbon ceramic resistor and the expected life of the carbon ceramic resistor can be obtained.

Claims

1. A non-destructive testing system for microcrack morphology of carbon ceramic resistivity under transient energy injection, characterized in that: It includes a controllable high-voltage DC charging power supply (1), a transient energy discharge unit (2), a carbon ceramic resistor (3), a control unit (4), and a microcrack detection unit (5). The controllable DC high voltage charging power supply (1) is used to charge the energy storage capacitor C in the transient energy discharge unit (2), and controls the transient / pulse current waveform parameters output by the transient energy discharge unit (2) by the magnitude of the charging voltage, thereby realizing the magnitude of transient energy applied to the carbon ceramic resistor (3). The transient energy discharge unit (2) includes an energy storage capacitor C, a discharge switch G, a waveform forming inductor L and a waveform forming resistor R. By adjusting the capacitance value of the energy storage capacitor, the forming inductor and the resistor value, the transient energy injected into the carbon ceramic resistor (3) reaches the preset value. The control unit (4) includes a programmable controller (4-1) and a charging voltage monitoring circuit (4-2). The charging voltage monitoring circuit (4-2) monitors the charging voltage across the energy storage capacitor C online and provides a discharge control signal to the discharge switch G when the charging voltage reaches the preset discharge voltage. The microcrack detection unit (5) mainly includes a transient energy measurement unit (51), a microcrack imaging scanner (52), and a computer measurement and control data processing unit (53). The transient energy measurement unit (51) and the computer measurement and control data processing unit (53) obtain the energy absorbed by the carbon ceramic resistor through current and the integration of current with time. The microcrack imaging scanner (52) is used to obtain microscopic microcrack images inside the carbon ceramic resistor. After analysis and processing by the computer measurement and control data processing unit, the microscopic features inside the carbon ceramic resistor under transient energy injection are obtained. The computer measurement and control data processing unit (53) is used to control the automatic operation of the transient energy withstand test of the carbon ceramic resistor, the acquisition and calculation of transient energy, and the acquisition and analysis of the microscopic morphological features inside the carbon ceramic resistor under transient energy injection. By controlling the adjustable high-voltage charging power supply through the computer measurement and control data processing unit and the control unit, different transient energies are injected into the carbon ceramic resistor. The microcrack detection unit (5) is used to detect the micro-morphological characteristics of the carbon ceramic resistor. By gradually increasing the transient energy injection, the computer measurement and control data processing unit analyzes the micro-morphology of the carbon ceramic resistor to obtain the change law of the micro-morphology of the carbon ceramic resistor, as well as the law between the occurrence, development and evolution of microcracks in the ceramic body and the injection of transient energy.

2. The non-destructive testing system for carbon ceramic resistive microcrack morphology under transient energy injection as described in claim 1, characterized in that: The transient energy measurement unit (51) includes a pulse voltage divider (51-1), a pulse current sensor (51-2), and an oscilloscope (51-3). The pulse voltage divider (51-1) measures the transient voltage across the carbon ceramic resistor (3), the pulse current sensor (51-2) measures the transient current flowing through the carbon ceramic resistor (3), and the oscilloscope (51-3) transmits the pulse voltage and pulse current signals to the computer measurement and control data processing unit (53) to obtain the energy absorbed by the carbon ceramic resistor through the current and the integration of the current with respect to time.

3. The non-destructive testing system for carbon ceramic resistive microcrack morphology under transient energy injection as described in claim 1, characterized in that: The microcrack imaging scanner (52) is an X-ray micro-CT scanner or a tomographic thermal imaging scanner. It detects and obtains micro-crack images inside the carbon ceramic resistive ceramic body. The micro-crack images inside the carbon ceramic resistive ceramic body are analyzed and processed by the computer measurement and control data processing unit (53) to obtain the micro-features inside the carbon ceramic ceramic body under transient energy injection.

4. The non-destructive testing system for carbon ceramic resistive microcrack morphology under transient energy injection as described in claim 2 or 3, characterized in that: The computer measurement and control data processing unit (53) includes an industrial control computer and its dedicated data management software, and is also used to automatically monitor the charging process of the transient energy test for non-destructive testing of carbon ceramic resistive microcracks; and to automatically control the process of the transient energy test in conjunction with the programmable logic controller (4-1); It enables waveform data processing for transient energy tests and image scanning analysis of microcrack morphology in carbon ceramic resistors; it also enables the recording, storage, querying, and output of transient energy test signals and images for carbon ceramic resistors.

5. A non-destructive testing method for the transient energy tolerance threshold of carbon ceramic resistance based on the microcrack detection of the testing system described in claim 4, characterized in that... Includes the following steps: 1) Set the discharge voltage or expected transient energy value of the transient energy discharge unit (2); 2) The computer measurement and control data processing unit (53) and the control unit (4) work together to control the transient energy discharge unit (2) by controlling the controllable DC high voltage charging power supply (1) through the programmable controller (4-1) and the charging voltage monitoring circuit (4-2). The power supply charges the energy storage capacitor C of the transient energy discharge unit (2) and automatically tracks the real-time state of the charging voltage across the energy storage capacitor C. When the charging voltage across the energy storage capacitor C reaches the preset discharge voltage, the power supply automatically gives a control pulse to the discharge switch G of the transient energy discharge unit (2) so that it breaks down and discharges to inject the specified transient energy into the carbon ceramic closing resistor. 3) Use a pulse voltage divider (51-1), a pulse current sensor (51-2), and an oscilloscope (51-3) to measure the transient voltage across the carbon ceramic resistor (3) and the transient current flowing through the carbon ceramic resistor (3) respectively; calculate the transient energy injected into the carbon ceramic resistor (3) through communication between the oscilloscope (51-3) and the computer and through the calculation of the computer measurement and control data analysis and management software. 4) The micro-crack imaging scanner (52) is used to detect the micro-morphological characteristics inside the carbon ceramic resistor (3). The image analysis of the computer measurement and control data analysis unit (53) is used to determine whether there are micro-cracks inside the carbon ceramic resistor. If not, the charging voltage of the controllable DC high voltage charging power supply (1) is increased to achieve a gradient increase in the transient energy of the carbon ceramic resistor until obvious micro-cracks appear inside the carbon ceramic resistor. 5) Repeat steps 1) to 4) to obtain a series of transient energy values ​​and image data of microcracks and their propagation inside the carbon ceramic resistor (3). Analyze the energy threshold that the carbon ceramic resistor can withstand, as well as the correlation between the development and evolution of microcracks in the carbon ceramic resistor and the injected transient energy.

6. The non-destructive testing method for transient energy tolerance threshold of carbon ceramic resistance in microcrack detection as described in claim 5, characterized in that: Based on the transient energy that the carbon ceramic resistor (3) needs to withstand during the actual closing process, repeat steps 1) to 4). By analyzing the transient energy value and the image data of the microcracks inside the carbon ceramic resistor (3) and their expansion, the evolution law of microcracks in the carbon ceramic resistor and the expected life of the carbon ceramic resistor are obtained.

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