Method and system for testing reliability of built-in sensor for active defense of converter transformer

Abstract

The invention provides a method and a system for testing the reliability of a built-in sensor for active defense of a converter transformer. The method comprises the following steps: performing a performance baseline test on the sensor; performing a sensor temperature cycle test, and checking the to-be-tested sensor and the sealing ring; the sensor is installed on the test tool, preset static pressure and preset high-temperature stress are applied to the sensor, the sensor to be tested is observed, and test signal response information of the sensor to be tested is detected; performing structural integrity detection on the sensor; and testing the equivalent height again to obtain the signal stability of the sensor. According to the invention, a three-in-one reliability evaluation system of ''performance baseline test-high and low temperature alternating test-accelerated aging test'' is constructed to evaluate the sealing performance, the structural stability and the signal consistency of the sensor under long-term operation conditions of high temperature, oil immersion and the like; and the structural integrity, the signal stability and the sealing reliability of the sensor under extreme working conditions such as oil immersion and high temperature are ensured.

Description

Technical Field

[0001] This invention relates to the field of converter transformer technology, and more specifically, to a method and system for testing the reliability of built-in sensors for active defense of converter transformers. Background Technology

[0002] Converter transformers are core equipment in high-voltage direct current transmission systems, and their safe and stable operation is directly related to the safe operation of the entire power system. Partial discharge is a precursor to the deterioration and breakdown of oil-paper insulation. Real-time monitoring of its occurrence and evolution is a key technical means to prevent sudden failures of converter transformers and ensure system reliability.

[0003] In recent years, built-in partial discharge sensors have demonstrated excellent performance in monitoring partial discharge in converter transformers. Compared with traditional external sensors, built-in sensors have significant advantages in sensing distance, electromagnetic interference resistance, and detection sensitivity, enabling high-precision monitoring closer to the discharge source. This makes them a key means of realizing intelligent transformers and online fault early warning.

[0004] Currently, there is relatively little research on built-in partial discharge sensors for active defense of converter transformers, and the evaluation methods for the long-term operating capability and reliability of built-in sensors under actual working conditions are still unclear. Summary of the Invention

[0005] In view of this, the present invention proposes a reliability testing method and system for built-in sensors used in active defense of converter transformers, aiming to solve the problem that existing built-in partial discharge sensors used in active defense of converter transformers lack systematic evaluation means for long-term operational reliability.

[0006] On one hand, this invention proposes a reliability testing method for a built-in sensor used in active defense of converter transformers. This testing method includes the following steps: a performance baseline test step, whereby a performance baseline test is performed on the sensor under test to obtain initial sensor performance results; wherein, the initial sensor performance results include: initial equivalent height and initial signal response information; an environmental adaptability test step, where the sensor under test with a sealing ring is placed in a high and low temperature test chamber and subjected to at least two cycles of sensor temperature cycling test. After each temperature cycling test, the sensor under test with the sealing ring is restored to a first preset environmental recovery period under standard atmospheric conditions, and then the sensor under test is checked for any abnormal phenomena and for any cracking of the sealing ring; an aging life test step, where the sensor under test that showed no abnormalities and no cracking of the sealing ring in the environmental adaptability test step is subjected to an aging life test. The sensor, equipped with a sealing ring, is installed on a test fixture. A preset static pressure and a preset high-temperature stress are applied to the sensor under test through the test fixture to accelerate aging of the sensor for a preset aging time period. During and after aging, the appearance of the sensor is observed, and the test signal response information is detected. In the structural inspection step, after the aging test, the sensor without appearance degradation is restored to a second preset environmental recovery time period, and then disassembled for structural integrity testing. In the performance inspection step, the equivalent height of the sensor that passes the structural integrity test is tested again to obtain the experimental equivalent height. The experimental equivalent height is compared with the initial equivalent height, and the test signal response information is compared with the initial signal response information to obtain the signal stability performance of the sensor.

[0007] Furthermore, the aforementioned reliability testing method for the built-in sensor used in active defense of converter transformers includes the following sub-steps in the performance baseline testing step: an equivalent height testing sub-step, which tests the equivalent height of the sensor under test in the frequency range of 300MHz to 1.5GHz; and a response information testing sub-step, which installs the sensor under test with a sealing ring onto a test fixture, injects an ultra-high frequency signal into the cavity of the test fixture through an antenna at a preset signal output position in the cavity, and records the response information of the sensor under test by controlling the magnitude of the injected signal to obtain its input-output characteristics.

[0008] Furthermore, in the aforementioned reliability testing method for the built-in sensor used in the active defense of converter transformers, the sensor temperature cycling step in the environmental adaptability test specifically includes: cooling the air temperature inside the high and low temperature test chamber to 0°C at a first preset rate, and after the temperature inside the high and low temperature test chamber stabilizes, maintaining this temperature for a first preset duration to keep the sensor under test at 0°C for a first preset duration; then heating the temperature to 100°C at a second preset rate and stabilizing it, maintaining this temperature for a second preset duration to keep the sensor under test at 100°C for a second preset duration; finally restoring the temperature to the laboratory ambient temperature at a third preset rate, maintaining this temperature for a third preset duration to keep the sensor under test at the laboratory ambient temperature for a third preset duration.

[0009] Furthermore, in the above-mentioned reliability test method for the built-in sensor for active defense of converter transformers, the first preset rate, the second preset rate, and the third preset rate are equal and all 10K / min, and the first preset duration, the second preset duration, and the third preset duration are equal and all 3 hours.

[0010] Furthermore, the aforementioned reliability testing method for the built-in sensor used in the active defense of converter transformers includes the following sub-steps in the aging life test step: a pressure sub-step, injecting transformer oil into the test fixture and maintaining the test fixture at a preset static pressure for a fourth preset time; a heating sub-step, heating the transformer oil in the test fixture and maintaining it at a preset oil temperature to apply temperature stress to the sensor under test, and continuing in this state for a fifth preset time of accelerated aging test; and during the aging process, checking the appearance degradation of the sensor under test every sixth preset time, and periodically injecting ultra-high frequency signals at a preset signal output position to record the signal response information of the sensor under test; wherein, the appearance degradation includes whether there is oil leakage, deformation, bulging, or discoloration on the shell, sealing ring, and connection surface.

[0011] Furthermore, in the above-mentioned reliability testing method for the built-in sensor used in active defense of converter transformers, the fourth preset duration is 24 hours, the fifth preset duration is 30 days, and the sixth preset duration is 5 days.

[0012] Furthermore, in the above-mentioned reliability test method for the built-in sensor used in the active defense of the converter transformer, the first preset environmental recovery time period is 24 hours, and the second preset environmental recovery time period is greater than or equal to 72 hours.

[0013] Furthermore, in the aforementioned reliability testing method for the built-in sensor used in the active defense of converter transformers, the signal response in the performance baseline test and the aging life test steps are both performed using a test fixture; wherein, the test fixture includes: a base; an oil cavity for holding transformer oil, disposed on the base, the oil cavity having a manhole for connecting the sensor to be tested; a heating assembly, disposed on the oil cavity, for heating the transformer oil in the oil cavity; and an oil conservator structure connected to the oil cavity.

[0014] Furthermore, in the above-mentioned reliability testing method for the built-in sensor used in the active defense of the converter transformer, the preset static pressure is 190kPa~200kPa, and the preset high-temperature stress is 120℃.

[0015] Furthermore, this invention also proposes a reliability testing system for a built-in sensor used in active defense of converter transformers. This testing system may include: a performance baseline testing module for performing a performance baseline test on the sensor under test to obtain initial sensor performance results; wherein the initial sensor performance results include: initial equivalent height and initial signal response information; an environmental adaptability testing module for placing the sensor under test with a sealing ring in a high and low temperature test chamber and conducting at least two cycles of sensor temperature cycling tests. After each temperature cycling test, the sensor under test with the sealing ring is restored to a first preset environmental recovery period under standard atmospheric conditions, and then the sensor under test is checked for any abnormal phenomena and for any cracking of the sealing ring; and an aging life testing module for testing sensors that show no abnormalities and have no cracked sealing rings during the environmental adaptability testing steps. The sensor under test, equipped with a sealing ring, is installed on a test fixture. A preset static pressure and a preset high-temperature stress are applied to the sensor under test through the test fixture to accelerate aging for a preset aging time period. During and after aging, the sensor under test is observed for any appearance degradation and its test signal response information is detected. A structural detection module is used to, after the aging test, restore the sensor under test without appearance degradation to a second preset environmental recovery time period, disassemble the sensor under test, and perform structural integrity testing. A performance detection module is used to retest the equivalent height of the sensor under test that has passed the structural integrity test, obtain the test equivalent height of the sensor under test, compare the test equivalent height with the initial equivalent height, and compare the test signal response information with the initial signal response information to obtain the signal stability performance of the sensor.

[0016] Furthermore, the aforementioned reliability testing system for built-in sensors used in active defense of converter transformers includes the following sub-modules in its performance baseline testing module: an equivalent height testing sub-module, used to test the equivalent height of the sensor under test in the frequency range of 300MHz to 1.5GHz; and a response information testing sub-module, used to install the sensor under test with a sealing ring onto the test fixture, inject a UHF signal into the cavity through an antenna at a preset signal output position in the cavity of the test fixture, and record the response information of the sensor under test by controlling the magnitude of the injected signal to obtain its input-output characteristics.

[0017] Furthermore, in the aforementioned reliability testing system for built-in sensors used in active defense of converter transformers, the sensor temperature cycling in the environmental adaptability test module specifically includes: cooling the air temperature inside the high and low temperature test chamber to 0°C at a first preset rate, and after the temperature inside the high and low temperature test chamber stabilizes, maintaining this temperature for a first preset duration to keep the sensor under test at 0°C for a first preset duration; then heating the temperature to 100°C at a second preset rate and stabilizing it, maintaining this temperature for a second preset duration to keep the sensor under test at 100°C for a second preset duration; finally, restoring the temperature to the laboratory ambient temperature at a third preset rate and maintaining this temperature for a third preset duration to keep the sensor under test at the laboratory ambient temperature for a third preset duration.

[0018] Furthermore, in the aforementioned built-in sensor reliability testing system for active defense of converter transformers, the first preset rate, the second preset rate, and the third preset rate are equal and all 10K / min, and the first preset duration, the second preset duration, and the third preset duration are equal and all 3 hours.

[0019] Furthermore, the aforementioned reliability testing system for built-in sensors used in active defense of converter transformers includes the following aging life test module: a pressurization submodule for injecting transformer oil into the test fixture and maintaining the test fixture at a preset static pressure for a third preset time; a heating submodule for heating the transformer oil in the test fixture and maintaining it at a preset oil temperature to apply temperature stress to the sensor under test, and continuously conducting an accelerated aging test for a fourth preset time under this condition; and during the aging process, checking the appearance degradation of the sensor under test every fifth preset time, and periodically injecting ultra-high frequency signals at a preset signal output position to record the signal response information of the sensor under test; wherein, the appearance degradation includes whether there is oil leakage, deformation, bulging, or discoloration on the shell, sealing ring, and connection surface.

[0020] Furthermore, in the aforementioned reliability testing system for built-in sensors used in active defense of converter transformers, the third preset duration is 24 hours, the fourth preset duration is 30 days, and the fifth preset duration is 5 days.

[0021] Furthermore, in the aforementioned built-in sensor reliability testing system for active defense of converter transformers, the first preset environmental recovery time period is 24 hours, and the second preset environmental recovery time period is greater than or equal to 72 hours.

[0022] Furthermore, in the aforementioned reliability testing system for built-in sensors used in active defense of converter transformers, the preset static pressure is 190kPa~200kPa, and the preset high-temperature stress is 120℃.

[0023] In another aspect, a computer-readable storage medium is provided, the storage medium storing a computer program for performing the methods described in any of the above aspects of the present invention.

[0024] In another aspect, an electronic device is provided, the electronic device comprising: a processor; a memory for storing processor-executable instructions; the processor being configured to read the executable instructions from the memory and execute the instructions to implement the method described in any of the preceding aspects of the present invention.

[0025] The present invention provides a reliability testing method and system for built-in sensors used in active defense of converter transformers. This system constructs a three-pronged reliability assessment framework: performance baseline testing, high and low temperature alternating test, and accelerated aging test. The high and low temperature alternating test simulates extreme cold and heat, as well as diurnal temperature fluctuations, effectively exposing the risks of sealing failure and structural degradation caused by thermal expansion and contraction. The accelerated aging test is equivalent to 10 years of actual operating life, and combined with a periodic detection mechanism, it predicts potential problems such as signal drift, leakage, and deformation caused by long-term aging. Furthermore, the test fixtures simulate high-temperature and high-pressure operating conditions, providing a quantitative assessment basis for the structural integrity, signal stability, and sealing reliability of the sensor in oil-immersed and high-temperature environments of converter transformers. This allows for the evaluation of the sensor's sealing performance, structural stability, and signal consistency under long-term operating conditions such as high temperature and oil immersion. The system systematically solves the problem of the lack of systematic assessment methods for the long-term operational reliability of existing built-in partial discharge sensors used in active defense of converter transformers, ensuring the structural integrity, signal stability, and sealing reliability of the sensor under extreme conditions such as oil immersion and high temperature. Attached Figure Description

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A flowchart illustrating the reliability testing method for a built-in sensor used in active defense of converter transformers provided in this embodiment of the invention; Figure 2A flowchart of a reliability testing method for built-in sensors used in active defense of converter transformers provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the test fixture provided in an embodiment of the present invention; Figure 4 A flowchart illustrating the performance baseline testing steps provided in this embodiment of the invention; Figure 5 A flowchart illustrating the aging life test steps provided in an embodiment of the present invention; Figure 6 This is a structural block diagram of a built-in sensor reliability testing system for active defense of converter transformers provided in an embodiment of the present invention. Figure 7 This is a structural block diagram of the performance baseline testing module provided in an embodiment of the present invention; Figure 8 This is a structural block diagram of the aging life test module provided in an embodiment of the present invention; Figure 9 This is a structural block diagram of an electronic device provided in an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures: 1-Base, 11-Support seat, 12-Moving wheel, 2-Oil chamber, 3-Oil conservator structure, 4-Pressure relief valve, 5-Pressure gauge. Detailed Implementation

[0028] Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments of the present invention. It should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0029] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0030] Those skilled in the art will understand that the terms "first," "second," etc., in the embodiments of the present invention are only used to distinguish different steps, devices, or modules, and do not represent any specific technical meaning, nor do they indicate a necessary logical order between them.

[0031] It should also be understood that in the embodiments of the present invention, "multiple" can refer to two or more, and "at least one" can refer to one, two or more.

[0032] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more unless explicitly defined or given contrary instructions in the context.

[0033] Furthermore, the term "and / or" in this invention is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this invention generally indicates that the preceding and following related objects have an "or" relationship.

[0034] It should also be understood that the description of the various embodiments in this invention emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0035] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0036] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0037] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0039] The embodiments of this invention can be applied to electronic devices such as terminal devices, computer systems, and servers, and can operate together with a wide range of other general-purpose or special-purpose computing system environments or configurations. Well-known examples of terminal devices, computing systems, environments, and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, and servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing environments including any of the above systems, etc.

[0040] Electronic devices such as terminal devices, computer systems, and servers can be described in the general context of computer system executable instructions (such as program modules) executed by a computer system. Typically, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in distributed cloud computing environments, where tasks are executed by remote processing devices linked through communication networks. In distributed cloud computing environments, program modules can reside on local or remote computing system storage media, including storage devices.

[0041] Method Implementation Examples: See Figure 1 and Figure 2 This is a preferred flowchart of the reliability testing method for the built-in sensor used in active defense of converter transformers provided in this embodiment of the invention. As shown in the figure, the testing method includes the following steps: The performance baseline test step S1 involves performing a performance baseline test on the sensor under test to obtain the initial performance results of the sensor; the initial performance results of the sensor include: initial equivalent height and initial signal response information.

[0042] Specifically, before conducting baseline performance testing on the sensor under test, sensor information can be confirmed, especially based on the sensor's nameplate, which identifies the manufacturer, model, manufacturing date, and product number. Theoretical baseline performance information can also be determined, including theoretical equivalent height data and theoretical signal response information. The signal response information can include sensitivity and linearity data to verify the sensor's sensitivity and linearity deviations. Then, the baseline performance of the sensor under test can be tested to obtain initial performance results. These initial results include initial equivalent height and initial signal response information, which can include initial sensitivity and initial linearity data. Finally, the initial equivalent height and initial signal response information can be compared with the corresponding data in the theoretical baseline performance information. If any corresponding difference exceeds the corresponding theoretical threshold, the sensor under test is deemed unqualified, and the test is terminated. If all differences are less than or equal to the corresponding theoretical thresholds, the sensor is initially deemed qualified, and the test proceeds to step S2 of the environmental adaptability test to continue with the high and low temperature alternating environment adaptability test.

[0043] In step S2 of the environmental adaptability test, the sensor under test with a sealing ring is placed in a high and low temperature test chamber and subjected to at least two temperature cycle tests. After each temperature cycle test, the sensor under test with a sealing ring is restored to the first preset environmental recovery time under the test standard atmospheric conditions. Then, the sensor under test is checked for any abnormal phenomena and the sealing ring is checked for any cracks.

[0044] Specifically, the sensor under test with a sealing ring is placed in a high and low temperature test chamber. The temperature of the air inside the chamber is adjusted, and at least two consecutive temperature cycling tests are performed. After each temperature cycling test, the sensor under test with the sealing ring is restored to a first preset environmental recovery period under standard atmospheric conditions. The sensor is then checked for any abnormalities, and the sealing ring is inspected for cracks. If either the sensor exhibits an abnormality or the sealing ring is cracked, the sensor is deemed unqualified, and the test is terminated. Otherwise, if neither abnormality nor crack is observed, the sensor is deemed qualified, and the test proceeds to step S3 of the aging life test. Sensors without abnormalities continue to undergo accelerated aging life tests under simulated actual operating conditions. The first preset environmental recovery period can be determined based on actual conditions and may be 24 hours or other time periods. The presence of abnormalities in the sensor includes checking for loosening, detachment, damage, or impurity precipitation.

[0045] In this embodiment, the sensor temperature cycle may specifically include: The air temperature inside the high and low temperature test chamber is lowered to 0°C at a first preset rate, and after the temperature inside the test chamber stabilizes, this process is continued for a first preset duration to keep the sensor under test at 0°C for the first preset duration. Specifically, the ultra-high frequency sensor under test, equipped with a sealing ring, can be placed in the high and low temperature test chamber. The air temperature inside the test chamber is lowered to 0°C at a first preset rate. After the temperature inside the test chamber stabilizes, the sensor is exposed for a first preset duration, i.e., after the temperature inside the high and low temperature test chamber stabilizes, this process is continued for the first preset duration to keep the sensor under test at 0°C for the first preset duration. In this embodiment, the first preset rate can be 10 K / min, and the first preset duration can be 3 hours, or other values ​​can be determined according to actual conditions. This embodiment does not impose any limitations on these values.

[0046] Subsequently, the temperature is raised to 100°C at a second preset rate and stabilized, then maintained at 100°C for a second preset duration. Specifically, the air temperature in the test chamber is raised to 100°C at a second preset rate. After the temperature inside the test chamber stabilizes, the test sample is exposed to the second preset temperature for a second preset duration, i.e., continuously for the second preset duration, to maintain the sensor under test at 100°C for the second preset duration. The second preset rate can be equal to the first preset rate, and the second preset duration can be equal to the first preset duration.

[0047] Finally, the temperature is restored to the laboratory ambient temperature at a third preset rate for a third preset duration, so that the sensor under test is kept at the laboratory ambient temperature for the third preset duration. Specifically, The air temperature in the test chamber is reduced to the laboratory ambient temperature at a third preset rate, and the exposure is maintained for 3 hours, i.e., for a third preset duration, to continuously expose the sensor under test to the laboratory ambient temperature for a third preset duration, completing one cycle. The third preset rate can be equal to the first preset rate, and the third preset duration can be equal to the first preset duration.

[0048] In step S3 of the aging life test, the sensor under test, which showed no abnormalities and no cracks in the sealing ring during the environmental adaptability test, and the sensor with the sealing ring are installed on the test fixture. A preset static pressure and a preset high temperature stress are applied to the sensor under test through the test fixture to accelerate the aging of the sensor under test for a preset aging time period. During and after the aging process, the appearance of the sensor under test is observed to see if there is any deterioration. The test signal response information of the sensor under test is also detected.

[0049] Specifically, sensors that have passed high and low temperature tests can be installed on a test fixture. A preset static pressure and a preset high-temperature stress are applied to the sensor under test through the test fixture, allowing for accelerated aging of the sensor over a preset aging period. During and after aging, the sensor's appearance deteriorates, and its signal response information is detected. The preset aging period can be 30 days, but other periods can be determined based on actual conditions. The preset static pressure can be 190kPa~200kPa, and the preset high-temperature stress can be 120℃. The preset static pressure and high-temperature stress can be applied by adjusting the oil filling and oil temperature within the test fixture's cavity. During the aging process, the sensor's appearance deteriorates periodically, and a high-frequency signal is periodically injected at a preset signal output position to record the sensor's signal response information. Appearance deterioration includes whether there is oil leakage, deformation, bulging, or discoloration on the shell, sealing ring, and connecting surfaces; i.e., changes in appearance (discoloration, deformation, bulging, cracking, etc.) and sealing performance (oil leakage, sealing ring detachment). If the sensor under test shows signs of appearance deterioration, it is determined that the sensor under test is unqualified; otherwise, the sensor under test is qualified, and the process proceeds to the structural inspection step S4 to perform structural integrity testing. That is, sensors that have no abnormalities in the aging test continue to undergo structural integrity testing.

[0050] In structural inspection step S4, after the aging test is completed, the sensor under test that does not show any signs of appearance deterioration is restored to the second preset environmental recovery period, and then the sensor under test is disassembled and its structural integrity is tested.

[0051] Specifically, after the aging test, the sensor under test, which shows no signs of appearance deterioration, is restored to a second preset environmental recovery period. This second preset environmental recovery period can be 72 hours, meaning the sensor and test fixture are allowed to recover at room temperature for 72 hours. The sensor is then disassembled, and its appearance (discoloration, deformation, bulging, cracking, etc.) and structural integrity (loose interfaces, misalignment of the housing) are inspected. Particular attention is paid to whether the sensor as a whole, including its internal components, shows signs of cracking, material loss, or color change. If the sensor's structural integrity is confirmed to be correct, the equivalent height is tested again. Otherwise, if any of the following conditions are found: cracking, material loss, or color change, the sensor is deemed unqualified.

[0052] In performance testing step S5, the equivalent height of the sensor under test that has passed the structural integrity test is tested again to obtain the experimental equivalent height of the sensor under test. The experimental equivalent height is compared with the initial equivalent height, and the experimental signal response information is compared with the initial signal response information to obtain the signal stability performance of the sensor.

[0053] Specifically, the equivalent height of the sensor under test that has passed the structural integrity test can be tested again to obtain the experimental equivalent height of the sensor under test. The experimental equivalent height is compared with the initial equivalent height, and the experimental signal response information is compared with the initial signal response information to obtain the signal stability performance of the sensor. In particular, the experimental equivalent height and experimental signal response information, such as experimental sensitivity and experimental linearity, can be compared with the corresponding initial values. The signal stability performance of the sensor is determined based on the difference ratio of the corresponding data. When any of the corresponding difference data is greater than the corresponding test threshold, the sensor under test is judged to be unqualified. When all the difference data are less than or equal to the corresponding test threshold, the sensor under test is judged to be qualified.

[0054] In this embodiment, the equivalent height of the sensor can be tested using a test fixture, especially by injecting a pulse signal to test the equivalent height of the sensor.

[0055] See Figure 3 This is a schematic diagram of the test fixture provided in an embodiment of the present invention. As shown in the figure, the test fixture is used to simulate the actual installed environment of the converter transformer and includes: a base 1, an oil cavity 2, a heating component (not shown in the figure), and an oil conservator structure 3; wherein, the oil cavity 2 is disposed on the base 1, the oil cavity 2 is used to hold transformer oil, and the oil cavity 2 is provided with a manhole for connecting the sensor to be tested; the heating component is disposed on the oil cavity 2 for heating the transformer oil in the oil cavity 2; the oil conservator structure 3 is connected to the oil cavity 2.

[0056] Specifically, the oil chamber 2 can be mounted on the base 1, and the oil chamber 2 can be filled with transformer oil. In this embodiment, the oil chamber 2 can be connected to an oil conservator structure 3 to accommodate the volume expansion of the transformer oil due to heating. In this embodiment, the oil chamber 2 is provided with manholes, and each manhole can be equipped with a sealing flange, which can be used to seal and connect other devices or components, such as sensors or antennas, for sensor testing. Alternatively, a high-frequency signal can be injected into the oil chamber 2 via the antenna for signal detection. In this embodiment, the oil conservator is connected to a pressure relief valve 4 and a pressure gauge 5 to ensure that pressure changes inside the chamber are controllable, and these can be located at the top of the oil conservator.

[0057] In this embodiment, the base 1 may include a support base 11 and multiple casters 12 disposed at the bottom of the support base 11. The support base 11 may be a rectangular frame structure supporting the test chamber. Casters 12 may be provided at the bottom of each of the four corners of the rectangular frame structure, enabling the movement and transportation of the entire fixture. In this embodiment, the casters 12 may be omnidirectional wheels or other wheel structures.

[0058] See Figure 4This is a flowchart of the performance baseline testing steps provided in an embodiment of the present invention. As shown in the figure, the performance baseline testing step S1 may include the following sub-steps: The equivalent height test sub-step S11 tests the equivalent height of the sensor under test in the frequency range of 300MHz to 1.5GHz.

[0059] Specifically, the baseline performance of the sensor is tested, and the equivalent height of the ultra-high frequency sensor in the range of 300MHz to 1.5GHz is tested, especially by injecting an ultra-high frequency signal with pulses.

[0060] In response information testing sub-step S12, the sensor under test with a sealing ring is installed on the test fixture, and a high-frequency signal is injected into the cavity through an antenna at the preset signal output position of the cavity of the test fixture. The response information of the sensor under test is recorded by controlling the magnitude of the injected signal to obtain its input-output characteristics.

[0061] Specifically, an ultra-high frequency (UHF) signal can be injected into the cavity (oil cavity 2) at a fixed position on the test fixture, especially at a preset signal output position, using an antenna. The response of the UHF sensor under test can be obtained by controlling the magnitude of the injected signal. The above two tests are used as the baseline performance of the UHF sensor. After confirming that the above steps are correct, the high and low temperature alternating environment adaptability test is continued.

[0062] See Figure 5 This is a flowchart of the aging life test steps provided in an embodiment of the present invention. As shown in the figure, the aging life test step S3 may include the following sub-steps: In step S31, transformer oil is injected into the test fixture, and the test fixture is kept at a preset static pressure for a fourth preset time.

[0063] Specifically, firstly, the sensor that has passed the high and low temperature tests is installed into the test fixture. Transformer oil is injected into the test fixture through the oil injection hole to maintain the fixture at a preset static pressure. The fixture is then left to stand for a fourth preset time to bring the device into a stable pre-operation state. The fourth preset time is 24 hours, and the preset static pressure is 190 kPa to 200 kPa.

[0064] In heating sub-step S32, the transformer oil in the test fixture is heated and kept constant at a preset oil temperature to apply temperature stress to the sensor under test. This accelerated aging test is carried out continuously for a fifth preset duration under this condition. During the aging process, the appearance degradation of the sensor under test is checked every sixth preset duration, and a UHF signal is periodically injected at a preset signal output position to record the signal response information of the sensor under test. The appearance degradation includes whether there is oil leakage, deformation, bulging, or discoloration on the shell, sealing ring, and connection surface.

[0065] Specifically, the heating component of the test fixture is activated, heating the transformer oil inside the fixture cavity and oil chamber 2 through the built-in heating component, thereby applying temperature stress to the sensor under test. The constant temperature, i.e., the preset high-temperature stress, can be 120℃. Next, under these conditions, an accelerated aging test is continuously conducted for the fifth preset duration, which can be 30 days (720 hours). Every sixth preset duration, the sensor's housing, sealing ring, and connection surfaces are periodically checked for signs of deterioration such as oil leakage, deformation, bulging, and discoloration. A high-frequency signal is injected at a fixed location, and the sensor's response is recorded. The sixth preset duration can be 5 days (120 hours).

[0066] In summary, the reliability testing method for built-in sensors used in active defense of converter transformers provided in this embodiment constructs a three-in-one reliability assessment system of "performance baseline testing - high and low temperature alternating test - accelerated aging test". The high and low temperature alternating test simulates extreme cold and heat and diurnal temperature fluctuations, effectively exposing the risk of sealing failure and structural deterioration caused by thermal expansion and contraction. The accelerated aging test is equivalent to 10 years of actual operating life, and combined with a periodic detection mechanism, it predicts potential hazards such as signal drift, leakage and deformation caused by long-term aging in advance. The test fixture realizes the safety simulation of high temperature and high pressure conditions, providing a quantitative assessment basis for the structural integrity, signal stability and sealing reliability of the sensor in the oil immersion and high temperature environment of the converter transformer. It can evaluate the sealing performance, structural stability and signal consistency of the sensor under long-term operating conditions such as high temperature and oil immersion. It systematically solves the problem of the lack of systematic assessment methods for the long-term operating reliability of built-in partial discharge sensors used in active defense of converter transformers, ensuring the structural integrity, signal stability and sealing reliability of the sensor under extreme conditions such as oil immersion and high temperature.

[0067] System Implementation Example: See Figure 6This is a structural block diagram of the built-in sensor reliability testing system for active defense of converter transformers provided in this embodiment of the invention. As shown in the figure, the built-in sensor reliability testing system for active defense of converter transformers includes: a performance baseline testing module 100, an environmental adaptability testing module 200, an aging life testing module 300, a structural inspection module 400, and a performance inspection module 500. The performance baseline testing module 100 is used to perform a performance baseline test on the sensor under test and obtain the initial performance results of the sensor. The initial sensor performance results include: initial equivalent height and initial signal response information. The environmental adaptability testing module 200 is used to place the sensor under test with a sealing ring in a high and low temperature test chamber and conduct at least two cycles of sensor temperature cycling test. After each temperature cycling test, the sensor under test with the sealing ring is restored to a first preset environmental recovery time period under standard atmospheric conditions, and the sensor under test is checked for any abnormal phenomena and for any cracks in the sealing ring. The aging life testing module 300 is used to perform the environmental adaptability test... The test sensor, which exhibits no abnormalities and has no cracked sealing ring, is mounted on a test fixture. A preset static pressure and a preset high-temperature stress are applied to the test sensor through the test fixture to accelerate aging for a preset aging time period. During and after aging, the appearance of the test sensor is observed, and the test signal response information is detected. The structural detection module 400, after the aging test, restores the test sensor without appearance degradation to a second preset environmental recovery time period, disassembles the test sensor, and performs structural integrity testing. The performance detection module 500 retests the equivalent height of the test sensor that has passed the structural integrity test, obtains the test equivalent height, compares the test equivalent height with the initial equivalent height, and compares the test signal response information with the initial signal response information to obtain the sensor's signal stability performance.

[0068] See Figure 7 This is a structural block diagram of the performance baseline test module provided in this embodiment of the invention. As shown in the figure, the performance baseline test module 100 may include an equivalent height test submodule 110 and a response information test submodule 120; wherein, the equivalent height test submodule 110 is used to test the equivalent height of the sensor under test in the frequency range of 300MHz to 1.5GHz; the response information test submodule 120 is used to install the sensor under test with a sealing ring onto the test fixture, and inject a UHF signal into the cavity through an antenna at a preset signal output position in the cavity of the test fixture, and record the response information of the sensor under test by controlling the magnitude of the injected signal to obtain its input-output characteristics.

[0069] Preferably, the sensor temperature cycling in the environmental adaptability test module specifically includes: cooling the air temperature inside the high and low temperature test chamber to 0°C at a first preset rate, and after the temperature inside the high and low temperature test chamber stabilizes, maintaining it at 0°C for a first preset duration; then heating it to 100°C at a second preset rate and stabilizing it, maintaining it at 100°C for a second preset duration; finally restoring it to the laboratory ambient temperature at a third preset rate and maintaining it at the laboratory ambient temperature for a third preset duration.

[0070] More preferably, the first preset rate, the second preset rate, and the third preset rate are equal and all are 10K / min, and the first preset duration, the second preset duration, and the third preset duration are equal and all are 3 hours.

[0071] See Figure 8 This is a structural block diagram of the aging life test module provided in this embodiment of the invention. As shown in the figure, the aging life test module 300 may include: a pressure submodule 310 and a heating submodule 320; wherein, the pressure submodule 310 is used to inject transformer oil into the test fixture and maintain the test fixture at a preset static pressure for a third preset time; the heating submodule 320 is used to heat the transformer oil in the test fixture and keep it at a preset oil temperature to apply temperature stress to the sensor under test, and continue to conduct an accelerated aging test for a fourth preset time under this state; and during the aging process, the appearance degradation of the sensor under test is checked every fifth preset time, and a high-frequency signal is periodically injected at a preset signal output position to record the signal response information of the sensor under test; wherein, the appearance degradation includes whether there is oil leakage, deformation, bulging, or discoloration on the shell, sealing ring, and connecting surface.

[0072] Preferably, the third preset duration is 24 hours, the fourth preset duration is 30 days, and the fifth preset duration is 5 days.

[0073] Preferably, the first preset environmental recovery time period is 24 hours, and the second preset environmental recovery time period is greater than or equal to 72 hours.

[0074] Preferably, the preset static pressure is 190kPa~200kPa, and the preset high temperature stress is 120℃.

[0075] Electronic device example: See Figure 9 This is a structural block diagram of the electronic device provided in an embodiment of the present invention. For example... Figure 9 As shown, the electronic device 600 includes one or more processors 61 and memory 62.

[0076] The processor 61 may be a central processing unit (CPU) or other form of processing unit with data processing and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0077] Memory 62 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and processor 61 may execute the program instructions to implement the methods of the software programs described in the various embodiments of the present invention above, and / or other desired functions. In one example, the electronic device may also include an input device 63 and an output device 64, these components being interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0078] In addition, the input device 63 may also include, for example, a keyboard, a mouse, etc.

[0079] The output device 64 can output various information to the outside. The output device 64 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0080] Of course, for the sake of simplicity, Figure 9 Only some of the components of this electronic device relevant to the present invention are shown, omitting components such as buses, input / output interfaces, etc. In addition, the electronic device may include any other suitable components depending on the specific application.

[0081] Examples of computer program products and computer-readable storage media: In addition to the methods and apparatus described above, embodiments of the present invention may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the steps in the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0082] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of the present invention. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0083] Furthermore, embodiments of the present invention may also be computer-readable storage media storing computer program instructions thereon, which, when executed by a processor, cause the processor to perform the steps of the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0084] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0085] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0086] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For system embodiments, since they largely correspond to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0087] The block diagrams of devices, systems, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, systems, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0088] The methods and systems of the present invention may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of the present invention are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, the present invention may also be implemented as a program recorded on a recording medium, the program comprising machine-readable instructions for implementing the methods according to the present invention. Thus, the present invention also covers recording media storing programs for performing the methods according to the present invention.

[0089] It should also be noted that in the systems, apparatus, and methods of the present invention, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalents of the present invention. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0090] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A built-in sensor reliability test method for active defense of a converter transformer, characterized in that, comprising the following steps: a performance baseline test step of performing a performance baseline test on the sensor under test to obtain initial sensor performance results; wherein the initial sensor performance results include initial equivalent height and initial signal response information; an environmental adaptability test step of placing the sensor under test with the sealing ring in a high-low temperature test chamber, performing at least two cycles of sensor temperature cycle tests, after each temperature cycle test, after the sensor under test with the sealing ring is restored to the test standard atmospheric conditions for a first predetermined environmental restoration period, checking whether the sensor under test has abnormal phenomena, and checking whether the sealing ring has cracking phenomena; an aging life test step of mounting the sensor under test without abnormal phenomena and the sealing ring without cracking phenomena in the environmental adaptability test step to a test tool, applying a predetermined static pressure and a predetermined high temperature stress to the sensor under test through the test tool to accelerate aging of the sensor under test for a predetermined aging period, and observing whether the sensor under test has appearance degradation phenomena during and after the aging, and detecting test signal response information of the sensor under test; a structure detection step of, after the aging test is completed, restoring the sensor under test without appearance degradation phenomena for a second predetermined environmental restoration period, disassembling the sensor under test, and detecting the structural integrity of the sensor under test; a performance detection step of, for the sensor under test with qualified structural integrity, performing a retest of the equivalent height, obtaining a test equivalent height of the sensor under test, comparing the test equivalent height with the initial equivalent height, comparing the test signal response information with the initial signal response information, and obtaining signal stability performance of the sensor.

2. The built-in sensor reliability test method for active defense of a converter transformer according to claim 1, characterized in that, The performance baseline test step comprises the following sub-steps: an equivalent height test sub-step of testing the equivalent height of the sensor under test in a frequency range of 300 MHz to 1.5 GHz; a response information test sub-step of mounting the sensor under test with the sealing ring to a test tool, injecting a very high frequency signal into a cavity of the test tool through an antenna at a predetermined signal output position of the cavity, recording response information of the sensor under test by controlling the size of the injected signal, and obtaining input-output characteristics of the sensor under test.

3. The built-in sensor reliability test method for active defense of a converter transformer according to claim 1 or 2, characterized in that, The sensor temperature cycle in the environmental adaptability test step specifically comprises: lowering the temperature of the air inside the high-low temperature test chamber to 0°C at a first predetermined rate, and after the temperature inside the high-low temperature test chamber stabilizes, maintaining the sensor under test at 0°C for a first predetermined time period; then raising the temperature to 100°C at a second predetermined rate and stabilizing, and maintaining the sensor under test at 100°C for a second predetermined time period; finally recovering to the laboratory environment temperature at a third predetermined rate, and maintaining the sensor under test at the laboratory environment temperature for a third predetermined time period.

4. The reliability test method for the built-in sensor for active defense of the converter transformer according to claim 3, characterized in that, The first preset rate, the second preset rate and the third preset rate are equal and are 10 K / min, and the first preset time length, the second preset time length and the third preset time length are equal and are 3 hours.

5. The built-in sensor reliability test method for active defense of a converter transformer according to claim 1 or 2, characterized in that, The aging life test step comprises the following sub-steps: The pressurizing sub-step injects transformer oil into the test tooling and maintains the test tooling at a preset static pressure for a fourth preset time length; The heating sub-step heats the transformer oil in the test tooling and maintains a preset oil temperature to apply temperature stress to the sensor under test, and the accelerated aging test is continued for a fifth preset time length in this state; And during the aging process, the appearance degradation of the sensor under test is checked every sixth preset time length, and a UHF signal is injected at a preset signal output position to record the signal response information of the sensor under test; wherein the appearance degradation includes whether the shell, the sealing ring, the connecting surface has oil leakage, deformation, bulging, color change.

6. The built-in sensor reliability test method for active defense of a converter transformer according to claim 5, characterized in that: The fourth preset time length is 24 hours, the fifth preset time length is 30 days, and the sixth preset time length is 5 days.

7. The built-in sensor reliability test method for active defense of a converter transformer according to claim 1 or 2, characterized in that: The first preset environment recovery time period is 24 hours, and the second preset environment recovery time period is greater than or equal to 72 hours.

8. The built-in sensor reliability test method for active defense of a converter transformer according to claim 1 or 2, characterized in that, The signal response in the performance baseline test and the aging life test step are both performed through test tooling; wherein the test tooling comprises: a base; an oil cavity for containing transformer oil, arranged on the base, and provided with a manhole on the oil cavity for connecting the sensor under test; a heating assembly arranged on the oil cavity for heating the transformer oil in the oil cavity; an oil pillow structure connected with the oil cavity.

9. The built-in sensor reliability test method for active defense of a converter transformer according to claim 1 or 2, characterized in that: The preset static pressure is 190 kPa to 200 kPa, and the preset high-temperature stress is 120 DEG C.

10. A built-in sensor reliability test system for active defense of a converter transformer, characterized by comprises: a performance baseline test module for performing performance baseline test on the sensor under test to obtain sensor performance initial results; wherein the sensor performance initial results include initial equivalent height and initial signal response information; an environmental adaptability test module for placing the sensor under test with a sealing ring in a high-low temperature test chamber to perform at least two cycles of sensor temperature cycle test, after each temperature cycle test, the sensor under test with a sealing ring is placed in a test standard atmosphere for a first preset environment recovery time period, and then whether the sensor under test has abnormal phenomenon and whether the sealing ring has cracking phenomenon are checked; The aging life test module is used for mounting the to-be-tested sensor with the sealing ring on the test tool, applying a preset static pressure and a preset high-temperature stress on the to-be-tested sensor through the test tool, performing accelerated aging on the to-be-tested sensor for a preset aging time period, and observing whether the to-be-tested sensor appears appearance degradation phenomenon during and after the aging process, and detecting test signal response information of the to-be-tested sensor; The structure detection module is used for, after the aging test is completed, dismounting the to-be-tested sensor after a second preset environment recovery time period, and detecting structure integrity of the to-be-tested sensor; The performance detection module is used for retesting the to-be-tested sensor of the structure integrity, obtaining test equivalent height of the to-be-tested sensor, comparing the test equivalent height with the initial equivalent height, and comparing the test signal response information with the initial signal response information, to obtain signal stability performance of the sensor.

11. The built-in sensor reliability test system for active defense of a converter transformer according to claim 10, characterized in that, The performance baseline test module comprises the following sub-modules: The equivalent height test sub-module is used for testing the equivalent height of the to-be-tested sensor in a frequency range of 300 MHz to 1.5 GHz. The response information test sub-module is used for mounting the to-be-tested sensor with the sealing ring on the test tool, injecting a very high frequency signal into the cavity through an antenna at a preset signal output position of a cavity of the test tool, and recording response information of the to-be-tested sensor by controlling the size of the injected signal, to obtain input-output characteristics thereof.

12. The built-in sensor reliability test system for active defense of a converter transformer according to claim 10 or 11, characterized in that, The sensor temperature cycle in the environmental adaptability test module comprises the following steps: The internal air temperature of the high-low temperature test box is decreased to 0°C at a first preset rate, and after the temperature in the high-low temperature test box is stabilized, the to-be-tested sensor is continuously kept at 0°C for a first preset time period; Then, the temperature is increased to 100°C at a second preset rate, and after the temperature is stabilized, the to-be-tested sensor is continuously kept at 100°C for a second preset time period; Finally, the temperature is recovered to the laboratory environment temperature at a third preset rate, and the to-be-tested sensor is continuously kept at the laboratory environment temperature for a third preset time period.

13. The reliability test system for the built-in sensor of the converter transformer active defense according to claim 12, wherein the first preset rate, the second preset rate and the third preset rate are equal and are 10 K / min, and the first preset time period, the second preset time period and the third preset time period are equal and are 3 hours. The aging life test module comprises the following:

14. The built-in sensor reliability test system for active defense of a converter transformer according to claim 10 or 11, characterized in that, The pressurization sub-module is used for injecting transformer oil into the test tool, and maintaining the test tool at a preset static pressure for a third preset time period; The heating sub-module is used for heating the transformer oil in the test tool and keeping the oil at a preset oil temperature, to apply temperature stress on the to-be-tested sensor, and in this state, the accelerated aging test is continuously performed for a fourth preset time period. ​ And in the aging process, every fifth preset time length check once the appearance of the sensor to be measured degradation phenomenon, and periodically in the preset signal output location injection ultra-high frequency signal to record the signal response information of the sensor to be measured; wherein, the appearance of the degradation phenomenon includes shell, sealing ring, connection surface whether there is oil, deformation, swelling, color change.

15. The built-in sensor reliability test system for active defense of the converter transformer according to claim 14, characterized in that, The third preset time length is 24h, the fourth preset time length is 30 days, and the fifth preset time length is 5 days.

16. The built-in sensor reliability test system for active defense of the converter transformer according to claim 10 or 11, characterized in that, The first preset environment recovery time period is 24h, and the second preset environment recovery time period is greater than or equal to 72h.

17. The built-in sensor reliability test system for active defense of the converter transformer according to claim 10 or 11, characterized in that, The preset static pressure is 190kPa~200kPa, and the preset high temperature stress is 120℃.

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