Insulation performance detection integrated device and method for transformer busbar

Abstract

The invention relates to the technical field of electrical equipment insulation state detection, and provides an insulation performance detection integrated device and method for a transformer busbar. The device comprises a non-contact electric field sensing unit which does not contact a transformer busbar and is used for sensing an alternating electric field generated by the surface of the transformer busbar due to voltage and outputting a sensing signal; the signal conditioning unit is used for processing the induction signal and outputting the conditioned induction signal; the environment parameter monitoring unit is used for collecting environment temperature and humidity data; the data analysis and processing unit is used for receiving the conditioned induction signal and the environment temperature and humidity data so as to evaluate an insulation resistance prediction value of the transformer busbar sheath; and the man-machine interaction and alarm unit is used for giving an alarm when the insulation resistance prediction value of the transformer busbar sheath is lower than a preset insulation resistance threshold value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment insulation state detection, and in particular to an insulation performance detection integrated device and method for a transformer busbar. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] The transformer low-voltage busbar is widely used in power plants, substations and industrial power distribution systems, and the working environment often involves complex conditions such as high and low temperature, humidity, dust and chemical corrosion. After long-term use, the sheath is prone to problems such as aging cracking, damage, peeling and thinning of the insulation layer, which may cause safety accidents such as short circuit, electric leakage and arc discharge, and even cause the equipment to shut down. Therefore, the power industry has a rigid demand for the insulation performance, physical integrity and environmental stability of the sheath, and needs to achieve rapid, accurate and non-destructive state evaluation through a special device.

[0004] At present, the traditional transformer low-voltage busbar sheath detection mainly relies on manual visual inspection, knocking inspection and insulation resistance meter measurement, which not only highly depends on the experience of the operator, is highly subjective and has a limited detection range, and is difficult to find hidden defects such as small cracks and internal aging, cannot accurately locate the position of local damage, and needs to be operated with power off, which not only affects the continuity of power supply, but also has safety risks in high-altitude and narrow-space operations, and lacks quantitative detection data to support sheath life prediction and condition maintenance, and is difficult to adapt to the intelligent operation and maintenance needs of the power system. SUMMARY

[0005] In order to solve the technical problems existing in the background art, the present application provides an insulation performance detection integrated device and method for a transformer busbar, which can realize continuous insulation detection of the entire length of the busbar under normal operation state, unmanned operation in high-pressure environment, and adaptation to busbars of different specifications and arrangement modes, and through non-contact sensing of the surface electric field information of the sheath, combined with multi-source data analysis, quantitative evaluation and deterioration state diagnosis of the sheath insulation resistance are realized, which has the advantages of safety, efficiency and accuracy.

[0006] In order to achieve the above purpose, the present application adopts the following technical solutions: The first aspect of the present application provides an insulation performance detection integrated device for a transformer busbar.

[0007] An insulation performance detection integrated device for a transformer busbar, comprising: a data analysis and processing unit, and a signal conditioning unit, an environmental parameter monitoring unit and a man-machine interaction and alarm unit connected thereto, wherein the signal conditioning unit is connected to a non-contact electric field sensing unit. The non-contact electric field sensing unit does not contact the transformer busbar and is used to sense the alternating electric field generated by voltage on the surface of the transformer busbar and output the sensing signal. The signal conditioning unit is used to process the inductive signal and output the conditioned inductive signal. The environmental parameter monitoring unit is used to collect environmental temperature and humidity data; The data analysis and processing unit is used to receive the conditioned induction signal and ambient temperature and humidity data to evaluate the predicted value of the insulation resistance of the transformer busbar sheath. The human-machine interaction and alarm unit is used to issue an alarm when the predicted insulation resistance value of the transformer busbar sheath is lower than the preset insulation resistance threshold.

[0008] Furthermore, the data analysis and processing unit is also connected to a remote communication unit for uploading the evaluation results of the data analysis and processing unit to a remote monitoring center / cloud platform.

[0009] Furthermore, the signal conditioning unit, environmental parameter monitoring unit, data analysis and processing unit, and human-machine interaction and alarm unit are also connected to the system power supply.

[0010] Furthermore, the non-contact electric field sensing unit includes: a metal shielding layer, an insulating encapsulation layer, and a sensing electrode arranged sequentially from the outside to the inside.

[0011] Furthermore, the integrated device for testing the insulation performance of the transformer busbar is integrated on a trolley, which is equipped with bidirectional elastic clamping rollers for clamping onto the transformer busbar sheath.

[0012] Furthermore, the vehicle is also equipped with a laser rangefinder to control the vehicle's moving distance and speed.

[0013] Furthermore, the bidirectional elastic clamping roller includes an upper roller and a lower roller, with a spring telescopic mechanism provided between the upper roller and the lower roller. Both the upper roller and the lower roller are provided with roller sleeves, which are made of insulating and wear-resistant rubber.

[0014] Furthermore, the integrated device for testing the insulation performance of transformer busbars also includes a remote control panel, which is connected to the trolley and controls the trolley's start, movement direction, and stop.

[0015] Furthermore, the remote control panel is equipped with a mute button, a report generation button, an emergency stop button, a display screen, forward buttons, reverse buttons, a data save button, a start button, a busbar voltage level selection knob, and an audible and visual alarm. The silencer key is used to manually turn off the audible and visual alarm when insulation damage is detected on the transformer busbar. The report generation key is used to generate a data detection report with one click; The emergency brake button is used to control the trolley to perform emergency braking; The display screen is used to display the detection results and alarm locations; The forward and backward keys are used to control the forward and backward movement of the trolley on the transformer busbar sheath; The data save key is used to save data; The start button is used to control the start of the vehicle; The busbar voltage level selection knob is used to adjust parameters when measuring the busbar sheath of transformers at different voltage levels. An audible and visual alarm is used to trigger an audible and visual alarm when damage to the transformer busbar sheath is detected.

[0016] A second aspect of the present invention provides a method for testing the insulation performance of transformer busbars.

[0017] A method for testing the insulation performance of transformer busbars, applied to the integrated device for testing the insulation performance of transformer busbars described in the first aspect, comprising: System deployment and baseline calibration ensure a constant distance between the non-contact electric field sensing unit and the transformer busbar sheath and record the reference signal; When the busbar is energized, the integrated insulation performance testing device moves at a constant speed along the transformer busbar sheath to collect induced signals and on-site temperature and humidity data. Based on the sensed signals and ambient temperature and humidity data, the predicted insulation resistance of the transformer busbar sheath is evaluated; when the predicted insulation resistance of the transformer busbar sheath is lower than the preset insulation resistance threshold, an alarm is triggered, and the data is recorded to form a trend curve. After the test is completed, a test report is generated with one click, which includes the test time, location, insulation resistance value, environmental conditions, and historical data comparison.

[0018] Compared with the prior art, the beneficial effects of the present invention are: This invention enables insulation performance testing of the sheath during uninterrupted busbar operation. By using an integrated insulation performance testing device pre-installed on the busbar and non-contact electric field sensing technology, direct electrical contact between testing personnel and high-voltage conductors is completely avoided, significantly improving operational safety. Compared to traditional qualitative judgment methods, this invention, based on a physical model and data-driven algorithms, can quantitatively assess the sheath insulation resistance, thus more accurately reflecting the degree of insulation degradation and providing reliable data support for condition-based maintenance. The entire testing device has a simple structure, is easy to install without modifying existing equipment, and is adaptable to different environmental conditions. It not only significantly improves testing efficiency and avoids power outage losses but also enables trend analysis and early warning of insulation performance through long-term monitoring, demonstrating strong practicality and widespread application value. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0020] Figure 1 This is a frame diagram of an integrated device for testing the insulation performance of transformer busbars, as shown in an embodiment of the present invention. Figure 2 This is a cross-sectional view of a non-contact electric field sensing unit shown in an embodiment of the present invention; Figure 3 This is a cross-sectional view of a non-contact electric field sensing unit shown in an embodiment of the present invention; Figure 4 This is an equivalent circuit diagram of the coupling capacitor system shown in an embodiment of the present invention; Figure 5 This is a structural diagram of another embodiment of the integrated device for testing the insulation performance of transformer busbars shown in this invention. Figure 6 This is a structural diagram of the bidirectional elastic clamping roller shown in an embodiment of the present invention; Figure 7 This is a structural diagram of the remote control screen shown in an embodiment of the present invention; The components include: 1. Metal shielding layer; 2. Insulating encapsulation layer; 3. Sensing electrode; 4. Insulation resistance of busbar insulating sheath; 5. Distributed capacitance of busbar sheath; 6. Input equivalent resistance of non-contact sensing unit; 7. Coupling capacitance between sensing unit and busbar; 8. Power frequency voltage source of busbar to ground; 9. Voltage signal sensed by non-contact electric field sensing unit; 10. Wireless charging module; 11. Laser rangefinder; 12. Signal conditioning unit; 13. Temperature and humidity sensor; 14. Non-contact electric field sensing unit; 15. Integrated circuit module; 16. Bidirectional elastic clamping roller; 17. Mute button; 18. Report generation button; 19. Emergency stop button; 20. Display screen; 21. Forward button; 22. Backward button; 23. Data save button; 24. Start button; 25. Busbar voltage level selection knob; 26. Audible and visual alarm. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] To address the shortcomings of traditional transformer low-voltage busbar sheath testing, which relies on manual experience, requires power-off operation, poses safety risks, and cannot quantitatively assess insulation status, this invention provides an integrated device and method for testing the insulation performance of transformer busbars. The following describes the solution in detail through several embodiments.

[0025] Figure 1 This is a frame diagram of an integrated device for testing the insulation performance of transformer busbars, as shown in an embodiment of the present invention; see reference. Figure 1 The integrated device for testing the insulation performance of transformer busbars includes: a data analysis and processing unit, and a signal conditioning unit, an environmental parameter monitoring unit, a human-machine interaction and alarm unit, and a remote communication unit, all connected to the data analysis and processing unit.

[0026] The signal conditioning unit is also connected to a non-contact electric field sensing unit, which is used to sense the alternating electric field generated by voltage on the surface of the busbar sheath without contacting it, and output the sensing signal.

[0027] The signal conditioning unit is used to filter, amplify, and convert the induced signal to analog-to-digital, and then transmit it to the data analysis and processing unit.

[0028] The environmental parameter monitoring unit includes a temperature sensor and a humidity sensor, which are used to monitor the ambient temperature and humidity at the detection location in real time and transmit the data to the data analysis and processing unit.

[0029] The data analysis and processing unit is used to receive the collected signals and environmental data, execute insulation performance analysis algorithms, and output insulation resistance evaluation results and condition diagnosis.

[0030] The human-machine interface and alarm unit is used to display the test results and historical trends, and to issue an alarm when the insulation performance is below the threshold.

[0031] In some embodiments, the human-machine interaction and alarm unit includes a local display and an audible and visual alarm.

[0032] The remote communication unit is used to transmit the detection data and analysis results of the data analysis and processing unit to the remote monitoring center / cloud platform.

[0033] In this embodiment, the integrated device for detecting the insulation performance of transformer busbars also includes a system power supply for supplying power to the signal conditioning unit, environmental parameter monitoring unit, data analysis and processing unit, human-machine interaction and alarm unit, etc.

[0034] Figure 2 This is a cross-sectional view of a non-contact electric field sensing unit shown in an embodiment of the present invention; Figure 3 This is a cross-sectional view of a non-contact electric field sensing unit shown in an embodiment of the present invention; as shown... Figure 2 , Figure 3 As shown, the non-contact electric field sensing unit includes a metal shielding layer 1, an insulating encapsulation layer 2, and a sensing electrode 3 arranged sequentially from the outside to the inside. This non-contact electric field sensing unit can be based on the principle of capacitive coupling.

[0035] In actual operation, after the non-contact electric field sensing unit is installed, the energized busbar, insulating sheath, sensing electrode, and ground form a coupling capacitor system. Figure 4 This is an equivalent circuit diagram of the coupling capacitor system shown in an embodiment of the present invention, such as... Figure 4 As shown, the coupling capacitor system includes: an insulation resistance 4 of the busbar insulation sheath, a distributed capacitance 5 of the busbar sheath, an input equivalent resistance 6 of the non-contact sensing unit, a coupling capacitor 7 between the sensing unit and the busbar, and a power frequency voltage source 8 of the busbar to ground. One end of the power frequency voltage source 8 of the busbar to ground is grounded, and the other end is connected to one end of the insulation resistance 4 of the busbar insulation sheath. The other end of the insulation resistance 4 of the busbar insulation sheath is connected to one end of the distributed capacitance 5 of the busbar sheath, one end of the input equivalent resistance 6 of the non-contact sensing unit, and one end of the coupling capacitor 7 between the sensing unit and the busbar. The other end of the distributed capacitance 5 of the busbar sheath, the other end of the input equivalent resistance 6 of the non-contact sensing unit, and the other end of the coupling capacitor 7 between the sensing unit and the busbar are grounded. The voltage signal 9 induced by the non-contact electric field sensing unit can be measured at the other end of the input equivalent resistance 6 of the non-contact sensing unit.

[0036] Figure 5 This is a structural diagram of another embodiment of the integrated device for testing the insulation performance of transformer busbars shown in this invention; see reference. Figure 5 This integrated device for testing the insulation performance of transformer busbars can be mounted on a trolley. The front of the trolley is equipped with a laser rangefinder 11, a signal conditioning unit 12, a temperature and humidity sensor 13, and a non-contact electric field sensing unit 14. All of these components are connected to an integrated circuit module 15. The trolley also features a wireless charging module 10 for powering the laser rangefinder 11, signal conditioning unit 12, temperature and humidity sensor 13, non-contact electric field sensing unit 14, and integrated circuit module 15.

[0037] The signal conditioning unit 12 is used to receive voltage level parameter instructions from the remote control panel, adjust the output signal, output reference signal / calibration signal, and filter, amplify, and perform analog-to-digital conversion on the sensing signal of the non-contact electric field sensing unit 14.

[0038] The integrated circuit module (data analysis and processing unit) 15 is used to receive and process the sensing signals, environmental data from the temperature and humidity sensor and the position of the laser rangefinder, and evaluate the insulation performance; parse the remote control panel instructions and receive operation instructions such as start, forward, backward and emergency braking; and temporarily store real-time data during the detection process.

[0039] The main structure of the vehicle is made of aluminum alloy, and the internal integrated circuit module 15 is distributed therein. The wireless charging module 10 provides energy and ensures that the vehicle can continue to operate without disassembly through wireless charging technology. The laser rangefinder 11 accurately measures the distance the vehicle moves, ensuring that the vehicle moves at a constant speed within the measurement range. The temperature and humidity sensor 13 can accurately measure the temperature and humidity near the busbar sheath. The non-contact electric field sensing unit 14 safely senses the power frequency electric field on the surface of the charged busbar insulation sheath through the principle of capacitive coupling, and accurately converts the electric field strength into a proportional micro-current or micro-voltage signal.

[0040] The trolley is also equipped with bidirectional elastic clamping rollers 16, such as Figure 6 As shown, the upper and lower rollers correspond to the upper and lower surfaces of the busbar, forming a vertical clamping force through elastic pressure to prevent the trolley from bouncing up and down or detaching from the busbar during movement. Utilizing a built-in spring telescopic mechanism, the rollers automatically adjust their opening and closing range according to the width and thickness of the busbar, eliminating the need for manual disassembly or adjustment of the mechanical structure, perfectly adapting to different specifications of transformer busbars. The roller sleeves are made of insulating and wear-resistant rubber to prevent scratching the busbar insulation layer.

[0041] In this embodiment, to enhance human-machine interaction, the integrated device for testing the insulation performance of transformer busbars also includes a remote control panel. Figure 7 This is a structural diagram of the remote control screen shown in an embodiment of the present invention; as follows: Figure 7 As shown, the remote control panel is equipped with a mute button 17, a report generation button 18, an emergency stop button 19, a display screen 20, a forward button 21, a reverse button 22, a data save button 23, a start button 24, a busbar voltage level selection knob 25, and an audible and visual alarm 26, which facilitates the actual use by operators. In addition, to save docking time, a manual mode has been added to the control panel, which allows for coarse adjustments by manual operation, that is, the selection of voltage parameters can be achieved through manual operation.

[0042] The silencing key 17 manually shuts off the audible and visual alarm when insulation damage is detected on the busbar. The report generation key 18 generates a data detection report with a single click. The emergency brake key 19 controls the trolley to brake suddenly. The forward and reverse keys 21 and 22 control the trolley's forward and backward movement on the transformer busbar sheath. The busbar voltage level selection knob 25 adjusts parameters when measuring transformer busbar sheaths at different voltage levels. The audible and visual alarm 26 provides an audible and visual alarm when the device detects damage to the transformer busbar sheath.

[0043] In another embodiment, the present invention also provides a method for testing the insulation performance of transformer busbars, applied to the aforementioned integrated device for testing the insulation performance of transformer busbars, comprising the following steps: Step 1: System Deployment and Calibration. Securely install the integrated device near the busbar section requiring testing, ensuring a constant and appropriate distance between the sensing surface of the non-contact electric field sensing unit and the surface of the busbar sheath. This distance should ensure sufficient signal strength and safety. During initial system installation or periodic maintenance, perform baseline calibration assuming the busbar insulation condition is known to be good, and record the corresponding reference sensing signal characteristic values ​​under the current environmental conditions.

[0044] Step 2: After completing Step 1, with the busbar energized, press the start button. The system will continuously or periodically start detection. The measuring device will start, and the forward button 21 will move at a constant speed on the busbar sheath. The non-contact sensing unit will sense the change in the electric field corresponding to the busbar power frequency voltage on the outer surface of the sheath, and output a weak induced current or voltage signal. The signal conditioning unit will process the signal to obtain stable power frequency signal characteristics, such as the signal amplitude, phase, or processed equivalent voltage. Simultaneously record the temperature T and humidity H measured by the environmental monitoring unit.

[0045] Step 3: After completing Step 2, establish the insulation resistance from the induced signal to the sheath. The physical and data-driven model is used. The charged busbar, insulating sheath, sensing electrodes, and ground form a coupling capacitor system. The sheath insulation resistance... It forms a parallel connection with the coupling capacitor in the system. Through circuit analysis, the amplitude of the induced signal is derived. busbar to ground voltage System coupling capacitors and insulation resistance The relationship model. This relationship model can be represented as:

[0046] By using experimental or historical data, we establish temperature and humidity control systems under different temperature (T) and humidity (H) conditions. These systems are then combined with numerical simulations to determine the optimal temperature and humidity levels. Key parameters of the system and Correction function:

[0047]

[0048] in, , The nominal value under standard conditions. This is a normalized correction function established based on material properties and environmental response. During online detection, the signal characteristics measured in real time, along with T and H, are substituted into the function to directly obtain... The predicted value.

[0049] Step 4: Calculate the predicted insulation resistance value. With the preset insulation resistance threshold A comparison is then made. The threshold can be set according to procedural requirements, manufacturer standards, or statistical results based on baseline data. If... < If the insulation performance of the sheath at that location is deemed substandard and at risk of deterioration, a warning or alarm signal will be issued via the human-machine interface unit. The system can continuously record... Historical data is used to plot trend curves, providing early warning of the slow degradation process of insulation performance.

[0050] Step 5: After the test is completed, press the report generation button to generate the test report, which includes the test time, location, measured insulation resistance value, environmental conditions, evaluation conclusion, and historical data comparison trend chart.

[0051] This invention enables non-contact insulation detection of busbars under energized conditions, which not only improves operational safety and avoids power outage losses, but also enables quantitative assessment of insulation status and early warning of degradation. It is compatible with different specifications of busbars and has strong field applicability and promotional value.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An integrated device for testing the insulation performance of transformer busbars, characterized in that, include: The data analysis and processing unit, as well as the signal conditioning unit, environmental parameter monitoring unit, and human-machine interaction and alarm unit, are all connected thereto. The signal conditioning unit is connected to the non-contact electric field sensing unit. The non-contact electric field sensing unit does not contact the transformer busbar and is used to sense the alternating electric field generated by voltage on the surface of the transformer busbar and output the sensing signal. The signal conditioning unit is used to process the inductive signal and output the conditioned inductive signal. The environmental parameter monitoring unit is used to collect environmental temperature and humidity data; The data analysis and processing unit is used to receive the conditioned induction signal and ambient temperature and humidity data to evaluate the predicted value of the insulation resistance of the transformer busbar sheath. The human-machine interaction and alarm unit is used to issue an alarm when the predicted insulation resistance value of the transformer busbar sheath is lower than the preset insulation resistance threshold.

2. The integrated device for testing the insulation performance of transformer busbars according to claim 1, characterized in that, The data analysis and processing unit is also connected to a remote communication unit, which is used to upload the evaluation results of the data analysis and processing unit to the remote monitoring center / cloud platform.

3. The integrated device for testing the insulation performance of transformer busbars according to claim 1, characterized in that, The signal conditioning unit, environmental parameter monitoring unit, data analysis and processing unit, and human-machine interaction and alarm unit are also connected to the system power supply.

4. The integrated device for testing the insulation performance of transformer busbars according to claim 1, characterized in that, The non-contact electric field sensing unit includes a metal shielding layer, an insulating encapsulation layer, and a sensing electrode arranged sequentially from the outside to the inside.

5. The integrated device for testing the insulation performance of transformer busbars according to claim 1, characterized in that, The integrated device for testing the insulation performance of transformer busbars is mounted on a trolley, which is equipped with bidirectional elastic clamping rollers for clamping onto the transformer busbar sheath.

6. The integrated device for testing the insulation performance of transformer busbars according to claim 5, characterized in that, The vehicle is also equipped with a laser rangefinder, which is used to control the vehicle's moving distance and speed.

7. The integrated device for testing the insulation performance of transformer busbars according to claim 5, characterized in that, The bidirectional elastic clamping roller includes an upper roller and a lower roller. A spring telescopic mechanism is provided between the upper roller and the lower roller. Both the upper roller and the lower roller are provided with roller sleeves, which are made of insulating and wear-resistant rubber.

8. The integrated device for testing the insulation performance of transformer busbars according to claim 5, characterized in that, The integrated device for testing the insulation performance of transformer busbars also includes a remote control panel, which is connected to the trolley and controls the trolley's start, movement direction, and stop.

9. The integrated device for testing the insulation performance of transformer busbars according to claim 8, characterized in that, The remote control panel is equipped with a mute button, a report generation button, an emergency stop button, a display screen, a forward button, a reverse button, a data save button, a start button, a busbar voltage level selection knob, and an audible and visual alarm. The silencer key is used to manually turn off the audible and visual alarm when insulation damage is detected on the transformer busbar. The report generation key is used to generate a data detection report with one click; The emergency brake button is used to control the trolley to perform emergency braking; The display screen is used to display the detection results and alarm locations; The forward and backward keys are used to control the forward and backward movement of the trolley on the transformer busbar sheath; The data save key is used to save data; The start button is used to control the start of the vehicle; The busbar voltage level selection knob is used to adjust parameters when measuring the busbar sheath of transformers at different voltage levels. An audible and visual alarm is used to trigger an audible and visual alarm when damage to the transformer busbar sheath is detected.

10. A method for testing the insulation performance of transformer busbars, characterized in that, The integrated device for testing the insulation performance of transformer busbars as described in any one of claims 1-9 comprises: System deployment and baseline calibration ensure a constant distance between the non-contact electric field sensing unit and the transformer busbar sheath and record the reference signal; When the busbar is energized, the integrated insulation performance testing device moves at a constant speed along the transformer busbar sheath to collect induced signals and on-site temperature and humidity data. Based on the sensed signals and ambient temperature and humidity data, the predicted insulation resistance of the transformer busbar sheath is evaluated; when the predicted insulation resistance of the transformer busbar sheath is lower than the preset insulation resistance threshold, an alarm is triggered, and the data is recorded to form a trend curve. After the test is completed, a test report is generated with one click, which includes the test time, location, insulation resistance value, environmental conditions, and historical data comparison.

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