Electrical equipment temperature calibration method and equipment based on infrared characteristics

Abstract

The invention discloses a power equipment temperature calibration method and equipment based on infrared characteristics. The calibration method comprises the following steps: continuously measuring the temperature provided by the blackbody constant-temperature source based on the infrared optical fiber bundle to finish the preliminary calibration of the gray scale-temperature calibration curve of the infrared optical fiber bundle; or, different gases are filled in the electrical equipment to complete the calibration experiment under the specific absorption atmosphere and complete the temperature calibration experiment under different atmospheres; or under multiple use scenes, multiple surface materials are selected in the power equipment, a power equipment surface material calibration experiment is carried out, and experimental equipment is provided; the device comprises an adjustable inclination angle detection platform, and the angle position adjustment of the infrared optical fiber bundle and the baffle plate can be realized through the adjustable inclination angle detection platform so as to adapt to different experiment requirements; according to the invention, the temperature of the infrared optical fiber bundle can be accurately measured under different working conditions, and a powerful technical guarantee is provided for safe and stable operation of a power system.

Description

Technical Field

[0001] The present invention belongs to the technical field of online monitoring of electric power equipment, and in particular relates to a temperature calibration method and device for electric power equipment based on infrared characteristics. Background Art

[0002] The safe and stable operation of power equipment is a core element in ensuring the reliability of the power system and is directly related to the reliability of power supply and system safety. As power equipment continues to develop towards higher capacity, higher voltage, and higher density, its internal operating environment is becoming increasingly complex, and the temperature distribution is also becoming more complex and variable. During long-term operation, abnormal temperature rises are very likely to occur within the equipment due to factors such as load fluctuations, poor contact, and insulation aging. Such temperature anomalies not only disrupt the normal operation of the equipment but can also cause safety accidents and serious damage to personnel and equipment. Therefore, real-time and accurate temperature monitoring of power equipment and the timely detection of potential faults are crucial to ensuring the safe and stable operation of the power system.

[0003] Traditional temperature monitoring technologies rely heavily on conventional contact temperature sensors, such as thermocouples and thermistors. These sensors typically measure temperature by directly contacting the surface or interior of a device. However, contact temperature sensors have limitations in their application to power equipment. They require high installation location and contact quality, and are easily affected by environmental factors, leading to inaccurate measurement results. The installation and maintenance of contact sensors in some power equipment operating in high-voltage or confined spaces are also challenging. Furthermore, due to the complexity of the temperature field in power equipment, traditional methods can only monitor limited points or areas, failing to fully and real-timely reflect changes in the entire temperature field.

[0004] In recent years, fiber optic temperature measurement technology has gradually become a cutting-edge solution for temperature monitoring of power equipment due to its non-contact, anti-electromagnetic interference, real-time and high-precision characteristics. However, the accuracy of infrared temperature measurement technology is affected by many factors, including the calibration system, the infrared radiation characteristics of the surface material being measured, surface roughness, gas environment, and the installation position of the fiber optic bundle. Therefore, how to efficiently and accurately calibrate the infrared radiation temperature measurement system to adapt to the complex working environment of power equipment has become an important problem in the technological development of the power industry. At present, the calibration methods of most infrared temperature measurement systems have problems such as low accuracy, poor environmental adaptability, and cumbersome calibration processes. Existing calibration technologies are often only targeted at a single gas environment or specific materials, and cannot cover the diverse operating conditions of power equipment. There is also a lack of effective solutions for temperature measurement needs under different surface roughness, different materials, and variable gas environments. The publication CN113447131A, "A Device and Method for Field Temperature Measurement Calibration of Infrared Thermal Imaging," proposes an improved blackbody calibration device, but it does not integrate the gas environment simulation and material emissivity calibration functions. There is no method or equipment that can complete high-precision temperature calibration under a variety of complex gas environments and different surface material conditions. Summary of the Invention

[0005] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a temperature calibration method and equipment for power equipment based on infrared characteristics. Through blackbody constant temperature source calibration experiments, gas environment simulation and surface material property research, it ensures that the optical fiber bundle can accurately measure the temperature under different working conditions, and solves the defects that the existing calibration technology cannot cover the diverse operating conditions of power equipment, and lacks effective solutions for temperature measurement requirements under different surface roughness, different materials and variable gas environments; the present invention comprehensively considers the influencing factors more comprehensively, is more in line with actual operating conditions, combines multiple influencing factors, and thus decides the most comprehensive calibration method, filling the gap in temperature calibration methods and equipment for power equipment based on infrared characteristics, and providing scientific and economical technical and data support for the industry to establish relevant methods.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A temperature calibration method for power equipment based on infrared characteristics, comprising:

[0008] Based on the infrared fiber bundle installed on the power equipment, the temperature provided by the blackbody constant temperature source is continuously measured, multiple calibration temperatures are set, and the calibration of the infrared fiber bundle temperature curve is completed;

[0009] or:

[0010] By filling the power equipment with different gases to complete the calibration experiment under a specific absorption atmosphere, the complex and diverse gas environment inside the actual power equipment is simulated. By heating the internal oil tank of the power equipment to change the temperature, and using an infrared fiber bundle to measure the temperature, the temperature calibration experiment under different atmospheres is completed.

[0011] or:

[0012] Based on the multiple usage scenarios of power equipment, surface materials that are the same as the various surface materials used inside the power equipment are selected on the experimental platform to conduct power equipment surface material calibration experiments.

[0013] The calibration of the infrared optical fiber bundle temperature curve includes:

[0014] (1.1) Fix the blackbody constant temperature source and infrared fiber bundle at the critical installation position. Set different temperatures for the blackbody constant temperature source during the experiment. Use the temperature adjustment strategy to ensure that the blackbody constant temperature source can provide high-precision temperature points.

[0015] (1.2) Using an infrared fiber bundle to measure a blackbody constant temperature source, obtain the corresponding relationship between the image grayscale value measured by the infrared fiber bundle and the blackbody temperature setting value;

[0016] (1.3) The image grayscale value is fitted with the precise temperature value of the blackbody constant temperature source to obtain the calibration curve, thereby completing the calibration.

[0017] The temperature adjustment strategy involved in step (1.1) is specifically:

[0018] (1.1.1) When the thermoelectric cooler in the blackbody constant temperature source is energized, it generates heat. This heat is transferred to the radiant heat dissipation component, where it is absorbed and stored, causing its temperature to gradually increase, simulating an infrared radiation target.

[0019] (1.1.2) The heat exchanger inside the blackbody constant temperature source exchanges heat with the external environment with the help of a fan to maintain the thermal stability of the entire blackbody constant temperature source;

[0020] (1.1.3) The high-precision platinum resistance temperature sensor embedded in the blackbody radiator is responsible for measuring the temperature of various parts of the equipment and converting the temperature data into electrical signals, which are then fed back to the temperature controller;

[0021] (1.1.4) The temperature controller compares the real-time temperature feedback with the set value, uses the PID control algorithm to adjust the output deviation, and generates a feedback control signal to regulate the drive circuit;

[0022] (1.1.5) When the temperature of the blackbody radiator stabilizes at the preset value, the PID control temperature cycle reaches equilibrium, and the blackbody constant temperature source enters a dynamic thermal equilibrium state, ensuring that the blackbody radiator continues to operate stably at the required temperature;

[0023] The step (1.1) involves setting different temperatures for the blackbody constant temperature source, specifically: setting multiple calibration temperature points by stably heating the blackbody constant temperature source within an adjustable temperature range, maintaining a consistent temperature difference between adjacent calibration temperatures, and ensuring uniformity of the heating gradient;

[0024] The step (1.2) specifically includes:

[0025] (1.2.1) Use a heat source with clear, regular boundaries to move across the surface of a blackbody constant temperature source and observe the response signal of the infrared fiber bundle. If the intensity of the received signal from the infrared fiber bundle drops below 90% of the maximum value in the central region, the current position is determined to be the critical installation position for the infrared fiber bundle.

[0026] (1.2.2) A boss is provided on the outer ring of the lens in the direction of the infrared fiber bundle’s light emission to ensure that the pressure exerted by the structure does not directly affect the reflective surface of the lens, and the reflective surface of the lens maintains its precise shape and surface quality;

[0027] (1.2.3) Use an external controller and a PC to record the grayscale values ​​of the image measured by the infrared fiber bundle, and then obtain the corresponding grayscale values ​​of the image at different temperatures of the blackbody constant temperature source.

[0028] The calibration experiment under a specific absorption atmosphere is completed by filling the power equipment with different gases, specifically including:

[0029] (2.1) Freely adjust the gas conditions in the power equipment and set the type and pressure parameters of the gas in the power equipment;

[0030] (2.2) Multiple heaters are used to uniformly heat the liquid in the oil tank of the power equipment. Pump circulation and stratified heating strategies are used to ensure uniform temperature of the liquid in the oil tank.

[0031] (2.3) To evaluate the measurement accuracy of the infrared fiber bundle under this condition, multiple reference thermocouples were set inside the power equipment and the thermocouple values ​​were compared with the measurement values ​​obtained by the infrared fiber bundle.

[0032] The adjustment of the gas conditions inside the power equipment in step (2.1) includes:

[0033] (2.1.1) The gas conditions are freely adjusted through the gas tank, gas pump, inlet pipe, and outlet pipe assembly, wherein the gas tank is used to store different types of gas, the gas pump is used to transport the gas from the gas tank to the inside of the power equipment, the inlet pipe connects the gas pump and the power equipment to transport the gas, and the outlet pipe is used to discharge the gas from the power equipment;

[0034] (2.1.2) The gas type inside the electrical equipment can be changed by replacing the gas tank to simulate different gas environments. When changing the gas type, the electrical equipment must be completely filled with the new gas to ensure that the old gas is completely discharged to avoid gas mixing that may affect the experimental results.

[0035] (2.1.3) The air pressure inside the electrical equipment is adjusted by charging and discharging air. A special air pump is equipped to assist in achieving a vacuum environment. The airtightness of the electrical equipment must be strictly checked before the experiment begins.

[0036] The step (2.2) of heating the oil tank inside the power equipment includes:

[0037] (2.2.1) The tank liquid is pumped from one end of the pipeline to the power equipment and flows out from the other end, completing the circulation of the tank liquid;

[0038] (2.2.2) Heaters are placed at different depths in the fuel tank to heat the liquid in the tank in layers. During the temperature adjustment process, the tank temperature is stabilized by circulating the heated liquid in the tank.

[0039] The step (2.3) comprises:

[0040] (2.3.1) Multiple reference thermocouples should be arranged so that they completely cover the radiation scanning area of ​​the infrared fiber bundle in the power equipment to ensure the integrity and authenticity of the temperature measurement;

[0041] (2.3.2) During the experiment, when the temperature of the electrical equipment to be measured stabilizes at the temperature indicated by the heater, subsequent data recording shall be carried out.

[0042] Based on the multiple usage scenarios of power equipment, the surface materials that are the same as the various surface materials used inside the power equipment are selected on the experimental platform to conduct the power equipment surface material calibration experiment, including:

[0043] (3.1) Build an infrared-based temperature calibration device for power equipment. An oil tank 1 is placed on one side of the upper surface of an adjustable tilt detection platform 3. A sample mounting area 4 is located on the outer surface of the oil tank 1. A baffle 5 is placed on the other side of the upper surface of the adjustable tilt detection platform 3. An infrared fiber bundle 2 is placed between the oil tank 1 and the baffle 5. Both the infrared fiber bundle 2 and the baffle 5 can be adjusted in angle via the adjustable tilt detection platform 3 to accommodate different experimental requirements.

[0044] (3.2) Select a typical material including aluminum, polytetrafluoroethylene, polymethyl methacrylate or steel as a calibration sample and install it on the outer surface of the fuel tank at the sample installation location 4;

[0045] (3.3) Selecting the known classical roughness of the power equipment as the calibration sample, the roughness experiment is carried out through group experiments to obtain the relationship between roughness, temperature and infrared fiber bundle response value;

[0046] (3.4) Alternately use calibration sample materials at the baffle 5 position to obtain the response values ​​of different materials to the infrared fiber bundle at the monitoring location;

[0047] (3.5) The adjustable tilt detection platform 3 is used to control the adjustment of the angle between the sample plane and the axis of the infrared optical fiber bundle 2.

[0048] The roughness test in step (3.3) includes:

[0049] (3.3.1) Group samples of the same material according to different surface roughness and fix them to the sample mounting area 4 on the outer surface of the fuel tank 1;

[0050] (3.3.2) Maintain a uniform gradient of sample surface temperature within the set temperature control range;

[0051] (3.3.3) The infrared fiber bundle receiving end is used to collect the radiation response value of each sample at a steady-state temperature in real time, and its three-dimensional mapping relationship with roughness and temperature is recorded to obtain the law of change of the infrared fiber bundle response value with temperature under different roughness conditions.

[0052] The adjustable tilt detection platform in step (3.5) includes:

[0053] (3.5.1) Control the angle between the sample plane and the infrared fiber bundle axis to uniformly adjust the gradient within the range of 0° to 60°;

[0054] (3.5.2) Under fixed temperature conditions, collect the response value attenuation curve corresponding to different angles, and define the effective working angle range based on the attenuation curve.

[0055] A temperature calibration device for electric power equipment based on infrared characteristics includes an adjustable inclination detection platform 3, an oil tank 1 is provided on one side of the upper surface of the adjustable inclination detection platform 3, a sample installation area 4 is provided on the outer surface of the oil tank 1, a baffle 5 is provided on the other side of the upper surface of the adjustable inclination detection platform 3, and an infrared optical fiber bundle 2 is provided between the oil tank 1 and the baffle 5. The infrared optical fiber bundle 2 and the baffle 5 can both be adjusted in angle through the adjustable inclination detection platform 3 to meet different experimental requirements.

[0056] Compared with the prior art, the present invention has the following beneficial effects:

[0057] 1. In step (1.1) of the present invention, a surface source blackbody is used as a blackbody constant temperature source, which provides a stable and adjustable calibration temperature point in a targeted manner and effectively provides a solution for calibrating infrared fiber bundles.

[0058] 2. Step (1.2.1) of the present invention determines the positions of the blackbody constant temperature source and the infrared fiber bundle, ensuring that the radiation range of the blackbody constant temperature source can completely cover the receiving area of ​​the infrared fiber bundle, thereby ensuring that the infrared fiber bundle can receive a uniform and stable radiation signal during the calibration process.

[0059] 3. In step (2.1) of the present invention, the gas type is changed by replacing the gas tank to simulate different gas environments in the power equipment, and the air tightness of the power equipment is strictly checked to ensure the stability of the air pressure and the accuracy of the measurement during the experiment.

[0060] 4. In step (2.2) of the present invention, the oil tank inside the power equipment is heated by a heater, the liquid flow path of the oil tank is designed, heaters are arranged at different depths of the oil tank and circulated heating is performed to ensure uniform temperature throughout the oil tank.

[0061] 5. In step (3.2) of the present invention, a variety of typical materials are selected as calibration samples. The physical and chemical properties of the calibration samples cover the typical properties of conductors, insulating components, casings and connectors in power equipment, thereby achieving full coverage of various application scenarios of power equipment.

[0062] 6. In step (3.4) of the present invention, an experimental platform with baffles is built, and multiple materials are used alternately at the baffle positions to simulate different medium environments inside the power equipment, providing data support for the application of infrared fiber bundles in complex environments.

[0063] 7. In step (3.5) of the present invention, an adjustable tilt detection platform is built, and the effective working angle range is creatively defined according to the response value attenuation curve corresponding to different angles, providing a scientific basis for the selection of the installation position of the infrared fiber bundle in the power equipment.

[0064] In summary, compared with the existing technology, the present invention, based on the characteristics of infrared fiber bundles, fills the gap in the temperature calibration of the internal gas environment and surface materials of power equipment for the first time, creates a new standard for the internal temperature field analysis of power equipment, and also provides an economical, convenient and comprehensive method support for building an infrared characteristic sample database of power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 This is a temperature calibration method for power equipment based on infrared characteristics and a schematic diagram of the equipment flow.

[0066] Figure 2 It is a calibration experimental platform under specific absorption atmosphere.

[0067] Figure 3 Collect images for calibration experiments under specific absorbing atmospheres.

[0068] Figure 4 Schematic diagram of the surface calibration experimental platform.

[0069] Numbers in the figure: 1. Fuel tank; 2. Infrared fiber bundle; 3. Adjustable inclination detection platform; 4. Sample installation location; 5. Baffle.

[0070] Figure 5 Acquire images for surface calibration experiments. DETAILED DESCRIPTION

[0071] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0072] Example 1

[0073] The present invention provides Figure 1 A temperature calibration method for power equipment based on infrared characteristics is shown in Figure 1 , based on the infrared fiber bundle set on the power equipment, the temperature provided by the blackbody constant temperature source is continuously measured, multiple calibration temperatures are set, and the calibration of the temperature curve of the infrared fiber bundle is completed;

[0074] The calibration of the infrared optical fiber bundle temperature curve includes:

[0075] (1.1) A blackbody constant temperature source and an infrared fiber bundle are fixed at a critical installation position. During the experiment, different temperatures are set for the blackbody constant temperature source. Specifically, multiple calibration temperature points are set by steadily increasing the temperature of the blackbody constant temperature source within its adjustable temperature range, maintaining the temperature difference between adjacent calibration temperatures consistent to ensure the uniformity of the heating gradient. A temperature adjustment strategy is used to ensure that the blackbody constant temperature source can provide high-precision temperature points. The temperature adjustment strategy involved is as follows:

[0076] (1.1.1) When the thermoelectric cooler in the blackbody constant temperature source is energized, it generates heat. This heat is transferred to the radiant heat dissipation component, where it is absorbed and stored, causing its temperature to gradually increase, simulating an infrared radiation target.

[0077] (1.1.2) The heat exchanger inside the blackbody constant temperature source exchanges heat with the external environment with the help of a fan to maintain the thermal stability of the entire blackbody constant temperature source;

[0078] (1.1.3) The high-precision platinum resistance temperature sensor embedded in the blackbody radiator is responsible for accurately measuring the temperature of various parts of the device and converting the temperature data into an electrical signal, which is then fed back to the temperature controller;

[0079] (1.1.4) The temperature controller compares the real-time temperature feedback with the set value, uses the PID control algorithm to adjust the output deviation, and generates a feedback control signal to regulate the drive circuit;

[0080] (1.1.5) When the temperature of the blackbody radiator stabilizes at the preset value, the PID control temperature cycle reaches equilibrium, and the blackbody constant temperature source enters a dynamic thermal equilibrium state, ensuring that the blackbody radiator continues to operate stably at the required temperature;

[0081] (1.2) Using an infrared fiber bundle to measure a blackbody constant temperature source, obtain the corresponding relationship between the image grayscale value measured by the infrared fiber bundle and the blackbody temperature setting value;

[0082] Specifically:

[0083] (1.2.1) Use a heat source with clear, regular boundaries to move across the surface of a blackbody constant temperature source and observe the response signal of the infrared fiber bundle. If the intensity of the received signal from the infrared fiber bundle drops below 90% of the maximum value in the central region, the current position is determined to be the critical installation position for the infrared fiber bundle.

[0084] (1.2.2) A boss is provided on the outer ring of the lens in the direction of the infrared fiber bundle’s light emission to ensure that the pressure exerted by the structure does not directly affect the reflective surface of the lens, and the reflective surface of the lens maintains its precise shape and surface quality;

[0085] (1.2.3) Use an external controller and a PC to record the grayscale values ​​of the image measured by the infrared fiber bundle, and then obtain the corresponding grayscale values ​​of the image at different temperatures of the blackbody constant temperature source.

[0086] (1.3) The image grayscale value is fitted with the precise temperature value of the blackbody constant temperature source to obtain the calibration curve, thereby completing the calibration.

[0087] Example 2

[0088] The present invention provides a method for temperature calibration of electric equipment based on infrared characteristics. Figure 1By filling the power equipment with different gases to complete the calibration experiment under a specific absorption atmosphere, the complex and diverse gas environment inside the real power equipment under actual operating conditions is simulated. By heating the internal oil tank of the power equipment to change the temperature, and using an infrared fiber bundle to measure the temperature, the temperature calibration experiment under different atmospheres is completed.

[0089] The calibration experiment under a specific absorption atmosphere is completed by filling the power equipment with different gases, specifically including:

[0090] (2.1) Freely adjust the gas conditions in the power equipment, set the type and pressure parameters of the gas in the power equipment, and the real calibration experimental platform such as Figure 2 As shown in the figure, the gas tank, experimental prototype, vacuum pump and heater involved in the calibration experiment under a specific absorption atmosphere are included;

[0091] (2.1.1) The gas conditions are freely adjusted through the gas tank, gas pump, inlet pipe, and outlet pipe assembly, wherein the gas tank is used to store different types of gas, the gas pump is used to transport the gas from the gas tank to the inside of the power equipment, the inlet pipe connects the gas pump and the power equipment to transport the gas, and the outlet pipe is used to discharge the gas from the power equipment;

[0092] (2.1.2) The gas type inside the electrical equipment can be changed by replacing the gas tank to simulate different gas environments. When changing the gas type, the electrical equipment must be completely filled with the new gas to ensure that the old gas is completely discharged to avoid gas mixing that may affect the experimental results.

[0093] (2.1.3) The air pressure inside the electrical equipment must be precisely adjusted by charging and discharging air. A dedicated air pump should be used to assist in achieving a vacuum environment. The airtightness of the electrical equipment must be strictly checked before the experiment begins.

[0094] (2.2) Multiple heaters are used to uniformly heat the liquid in the oil tank of the power equipment. Pump circulation and stratified heating strategies are used to ensure uniform temperature of the liquid in the oil tank.

[0095] (2.2.1) The tank liquid is pumped from one end of the pipeline to the power equipment and flows out from the other end, completing the circulation of the tank liquid;

[0096] (2.2.2) Heaters are placed at different depths in the fuel tank to heat the liquid in the tank in layers. During the temperature adjustment process, the temperature of the tank is stabilized by circulating the heated liquid in the tank;

[0097] (2.3) To evaluate the measurement accuracy of the infrared fiber bundle under these conditions, multiple reference thermocouples were set inside the power equipment and the thermocouple values ​​were compared with the measured values ​​obtained with the infrared fiber bundle. Figure 3The image is collected for the calibration experiment under a specific absorption atmosphere. The figure describes the image collected of the infrared radiation inside the power equipment under a specific absorption atmosphere.

[0098] (2.3.1) Multiple reference thermocouples should be arranged so that they completely cover the radiation scanning area of ​​the infrared fiber bundle in the power equipment to ensure the integrity and authenticity of the temperature measurement;

[0099] (2.3.2) When the temperature of the electrical equipment to be measured stabilizes at the heater indication temperature during the experiment, subsequent data recording shall be performed;

[0100] Example 3

[0101] The present invention provides a method for temperature calibration of electric equipment based on infrared characteristics. Figure 1 Based on the multiple usage scenarios of power equipment, the surface materials that are the same as the various surface materials used inside the power equipment are selected on the experimental platform to conduct the power equipment surface material calibration experiment. Figure 4 , specifically:

[0102] (3.1) Build an infrared-based temperature calibration device for power equipment. An oil tank 1 is placed on one side of the upper surface of an adjustable tilt detection platform 3. A sample mounting area 4 is located on the outer surface of the oil tank 1. A baffle 5 is placed on the other side of the upper surface of the adjustable tilt detection platform 3. An infrared fiber bundle 2 is placed between the oil tank 1 and the baffle 5. Both the infrared fiber bundle 2 and the baffle 5 can be adjusted in angle via the adjustable tilt detection platform 3 to accommodate different experimental requirements.

[0103] (3.2) Select a typical material such as aluminum, polytetrafluoroethylene, polymethyl methacrylate, or steel as a calibration sample and install it at the sample installation location 4 on the outer surface of the fuel tank;

[0104] (3.3) The known classical roughness of the power equipment is selected as the calibration sample. The roughness experiment is carried out through group experiments to obtain the relationship between roughness, temperature and infrared fiber bundle response value. Figure 5 Images collected for surface calibration experiments. The figure depicts images of infrared radiation collected from calibration materials with different roughness at a certain temperature.

[0105] (3.3.1) Group samples of the same material according to different surface roughness and fix them to the sample mounting area 4 on the outer surface of the fuel tank 1;

[0106] (3.3.2) Maintain a uniform gradient of sample surface temperature within the set temperature control range;

[0107] (3.3.3) The infrared fiber bundle receiving end collects the radiation response value of each sample at steady-state temperature in real time, records its three-dimensional mapping relationship with roughness and temperature, and obtains the temperature-dependent variation pattern of the infrared fiber bundle response value at different roughness levels.

[0108] (3.4) Alternately use calibration sample materials at the baffle 5 position to obtain the response values ​​of different materials to the infrared fiber bundle at the monitoring location;

[0109] (3.5) The adjustable tilt detection platform 3 is used to control the angle between the sample plane and the axis of the infrared fiber bundle 2;

[0110] (3.5.1) During the experiment, the angle between the sample plane and the infrared fiber bundle axis was controlled to be uniformly adjusted within the range of 0° to 60°;

[0111] (3.5.2) Under fixed temperature conditions, collect the response value attenuation curve corresponding to different angles, and define the effective working angle range based on the attenuation curve.

Claims

1. A temperature calibration method for power equipment based on infrared characteristics, characterized in that: include: Based on the infrared fiber bundle installed on the power equipment, the temperature provided by the blackbody constant temperature source is continuously measured, multiple calibration temperatures are set, and the calibration of the infrared fiber bundle temperature curve is completed; or: By filling the power equipment with different gases to complete the calibration experiment under a specific absorption atmosphere, the complex and diverse gas environment inside the actual power equipment is simulated. By heating the internal oil tank of the power equipment to change the temperature, and using an infrared fiber bundle to measure the temperature, the temperature calibration experiment under different atmospheres is completed. or: Based on the multiple usage scenarios of power equipment, surface materials that are the same as the various surface materials used inside the power equipment are selected on the experimental platform to conduct power equipment surface material calibration experiments.

2. The method for temperature calibration of electric power equipment based on infrared characteristics according to claim 1, characterized in that: The calibration of the infrared optical fiber bundle temperature curve includes: (1.1) Fix the blackbody constant temperature source and infrared fiber bundle at the critical installation position. Set different temperatures for the blackbody constant temperature source during the experiment. Use the temperature adjustment strategy to ensure that the blackbody constant temperature source can provide high-precision temperature points. (1.2) Using an infrared fiber bundle to measure a blackbody constant temperature source, obtain the corresponding relationship between the image grayscale value measured by the infrared fiber bundle and the blackbody temperature setting value; (1.3) The image grayscale value is fitted with the precise temperature value of the blackbody constant temperature source to obtain the calibration curve, thereby completing the calibration.

3. The method for temperature calibration of electric power equipment based on infrared characteristics according to claim 2, characterized in that: The temperature adjustment strategy involved in step (1.1) is specifically: (1.1.1) When the thermoelectric cooler in the blackbody constant temperature source is energized, it generates heat. This heat is transferred to the radiant heat dissipation component, where it is absorbed and stored, causing its temperature to gradually increase, simulating an infrared radiation target. (1.1.2) The heat exchanger inside the blackbody constant temperature source exchanges heat with the external environment with the help of a fan to maintain the thermal stability of the entire blackbody constant temperature source; (1.1.3) The high-precision platinum resistance temperature sensor embedded in the blackbody radiator is responsible for measuring the temperature of various parts of the equipment and converting the temperature data into electrical signals, which are then fed back to the temperature controller; (1.1.4) The temperature controller compares the real-time temperature feedback with the set value, uses the PID control algorithm to adjust the output deviation, and generates a feedback control signal to regulate the drive circuit; (1.1.5) When the temperature of the blackbody radiator stabilizes at the preset value, the PID-controlled temperature cycle reaches equilibrium, and the blackbody constant temperature source enters a dynamic thermal equilibrium state, ensuring that the blackbody radiator continues to operate stably at the required temperature.

4. The method for temperature calibration of electric power equipment based on infrared characteristics according to claim 2, characterized in that: The step (1.1) involves setting different temperatures for the blackbody constant temperature source, specifically: setting multiple calibration temperature points by stably heating the blackbody constant temperature source within its adjustable temperature range, keeping the temperature difference between adjacent calibration temperatures consistent, and ensuring the uniformity of the heating gradient.

5. The method for temperature calibration of electric power equipment based on infrared characteristics according to claim 2, characterized in that: The step (1.2) specifically includes: (1.2.1) Use a heat source with clear, regular boundaries to move across the surface of a blackbody constant temperature source and observe the response signal of the infrared fiber bundle. If the intensity of the received signal from the infrared fiber bundle drops below 90% of the maximum value in the central region, the current position is determined to be the critical installation position for the infrared fiber bundle. (1.2.2) A boss is provided on the outer ring of the lens in the direction of the infrared fiber bundle’s light emission to ensure that the pressure exerted by the structure does not directly affect the reflective surface of the lens, and the reflective surface of the lens maintains its precise shape and surface quality; (1.2.3) Use an external controller and a PC to record the grayscale values ​​of the image measured by the infrared fiber bundle, and then obtain the corresponding grayscale values ​​of the image at different temperatures of the blackbody constant temperature source.

6. The method for temperature calibration of electric power equipment based on infrared characteristics according to claim 1, characterized in that: The calibration experiment under a specific absorption atmosphere is completed by filling the power equipment with different gases, specifically including: (2.1) Freely adjust the gas conditions in the power equipment and set the type and pressure parameters of the gas in the power equipment; (2.2) Multiple heaters are used to uniformly heat the liquid in the oil tank of the power equipment. Pump circulation and stratified heating strategies are used to ensure uniform temperature of the liquid in the oil tank. (2.3) To evaluate the measurement accuracy of the infrared fiber bundle under this condition, multiple reference thermocouples were set inside the power equipment and the thermocouple values ​​were compared with the measurement values ​​obtained by the infrared fiber bundle.

7. The method for temperature calibration of electric power equipment based on infrared characteristics according to claim 6, characterized in that: The adjustment of the gas conditions inside the power equipment in step (2.1) includes: (2.1.1) The gas conditions are freely adjusted through the gas tank, gas pump, inlet pipe, and outlet pipe assembly, wherein the gas tank is used to store different types of gas, the gas pump is used to transport the gas from the gas tank to the inside of the power equipment, the inlet pipe connects the gas pump and the power equipment to transport the gas, and the outlet pipe is used to discharge the gas from the power equipment; (2.1.2) The gas type inside the electrical equipment can be changed by replacing the gas tank to simulate different gas environments. When changing the gas type, the electrical equipment must be completely filled with the new gas to ensure that the old gas is completely discharged to avoid gas mixing that may affect the experimental results. (2.1.3) The air pressure inside the electrical equipment is adjusted by charging and discharging air. A special air pump is equipped to assist in achieving a vacuum environment. The airtightness of the electrical equipment must be strictly checked before the experiment begins.

8. The method for temperature calibration of electric power equipment based on infrared characteristics according to claim 6, characterized in that: The step (2.2) of heating the oil tank inside the power equipment includes: (2.2.1) The tank liquid is pumped from one end of the pipeline to the power equipment and flows out from the other end, completing the circulation of the tank liquid; (2.2.2) Heaters are placed at different depths in the fuel tank to heat the liquid in the tank in layers. During the temperature adjustment process, the temperature of the tank is stabilized by circulating the heated liquid in the tank; The step (2.3) comprises: (2.3.1) Multiple reference thermocouples should be arranged so that they completely cover the radiation scanning area of ​​the infrared fiber bundle in the power equipment to ensure the integrity and authenticity of the temperature measurement; (2.3.2) During the experiment, when the temperature of the electrical equipment to be measured stabilizes at the temperature indicated by the heater, subsequent data recording shall be carried out.

9. The method for temperature calibration of electric power equipment based on infrared characteristics according to claim 1, characterized in that: Based on the multiple usage scenarios of power equipment, the surface materials that are the same as the various surface materials used inside the power equipment are selected on the experimental platform to conduct the power equipment surface material calibration experiment, including: (3.1) A temperature calibration device for electric power equipment based on infrared characteristics is constructed, wherein an oil tank (1) is arranged on one side of the upper surface of an adjustable tilt detection platform (3), a sample installation portion (4) is arranged on the outer surface of the oil tank (1), a baffle (5) is arranged on the other side of the upper surface of the adjustable tilt detection platform (3), an infrared optical fiber bundle (2) is arranged between the oil tank (1) and the baffle (5), wherein both the infrared optical fiber bundle (2) and the baffle (5) can be adjusted in angle through the adjustable tilt detection platform (3) to meet different experimental requirements; (3.2) Select typical materials including aluminum, polytetrafluoroethylene, polymethyl methacrylate or steel as calibration samples and install them on the sample installation area (4) on the outer surface of the fuel tank; (3.3) Selecting the known classical roughness of the power equipment as the calibration sample, the roughness experiment is carried out through group experiments to obtain the relationship between roughness, temperature and infrared fiber bundle response value; (3.4) Alternately use calibration sample materials at the baffle (5) position to obtain the response values ​​of different materials to the infrared fiber bundle at the monitoring location; (3.5) controlling the angle between the sample plane and the axis of the infrared optical fiber bundle (2) through an adjustable tilt detection platform (3); The roughness test in step (3.3) includes: (3.3.1) Group samples of the same material according to different surface roughness and fix them to the sample mounting area (4) on the outer surface of the fuel tank (1); (3.3.2) Maintain a uniform gradient of sample surface temperature within the set temperature control range; (3.3.3) The infrared fiber bundle receiving end collects the radiation response value of each sample at steady-state temperature in real time, records its three-dimensional mapping relationship with roughness and temperature, and obtains the temperature-dependent variation pattern of the infrared fiber bundle response value at different roughness levels. The adjustable tilt detection platform in step (3.5) includes: (3.5.1) Control the angle between the sample plane and the infrared fiber bundle axis to uniformly adjust the gradient within the range of 0° to 60°; (3.5.2) Under fixed temperature conditions, collect the response value attenuation curve corresponding to different angles, and define the effective working angle range based on the attenuation curve.

10. A temperature calibration device for power equipment based on infrared characteristics, characterized in that: The invention comprises an adjustable tilt detection platform (3), wherein an oil tank (1) is provided on one side of the upper surface of the adjustable tilt detection platform (3), a sample installation portion (4) is provided on the outer surface of the oil tank (1), a baffle (5) is provided on the other side of the upper surface of the adjustable tilt detection platform (3), and an infrared optical fiber bundle (2) is provided between the oil tank (1) and the baffle (5). The infrared optical fiber bundle (2) and the baffle (5) can both be adjusted in angle through the adjustable tilt detection platform (3) to meet different experimental requirements.

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