High-altitude and low-altitude converter transformer air cooler heat dissipation capacity conversion method
By establishing the formula for heat absorption on the air side and conducting extreme environment laboratory simulations, the altitude correction coefficient of the cooler was determined, solving the problem of reduced heat dissipation capacity at high altitudes and achieving accurate conversion and design optimization of heat dissipation capacity at high and low altitudes.
Patent Information
- Application Number
- CN202511451625.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-11
- Publication Date
- 2026-01-09
AI Technical Summary
In high-altitude areas, the heat dissipation capacity of the air cooler of the converter transformer is significantly reduced. Existing technologies lack effective quantitative conversion models, which leads to design difficulties and high costs. Furthermore, traditional testing methods are complex and expensive.
A theoretical calculation model based on the air-side heat absorption formula was established. Combined with extreme environment test chamber simulation of different altitudes, the cooling capacity correction coefficient was determined by measuring and calculating the measured values and theoretical values of the air cooler, so as to achieve accurate conversion of heat dissipation capacity at high and low altitudes.
It enables accurate prediction of high-altitude heat dissipation performance in low-altitude laboratories, reduces the cost of extreme environment testing, ensures design accuracy, and lowers equipment costs and investment.
Smart Images
Figure CN121302967A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of thermal management technology for power equipment, specifically to a method for calculating the heat dissipation capacity of air coolers for converter transformers at high and low altitudes. Background Technology
[0002] As a key component of ultra-high voltage direct current (UHVDC) power transmission, the heat dissipation performance of converter transformers directly affects the reliability of the system. In high-altitude areas, air density decreases significantly with increasing altitude (e.g., at 5000 meters, the air density is only 52% of that at sea level), leading to a sharp decline in the heat dissipation capacity of converter transformer air coolers, which rely on forced air cooling as their core heat dissipation method. The existing technology suffers from the following problems: There is no mature model for the quantitative conversion relationship between the heat dissipation capacity of coolers in high-altitude and low-altitude environments, and designers cannot accurately predict the actual performance of the same cooler in high-altitude areas. Traditional methods require real-world testing at high altitudes or in simulated chambers, but building high-altitude testing environments is difficult, time-consuming, and costly, and extreme environment laboratories are scarce. To ensure heat dissipation requirements under high-altitude operating conditions, designs often over-enlarge the capacity of the cooler, resulting in a significant increase in equipment size, weight, and cost.
[0003] This invention establishes a theoretical model and correction coefficients, which allows for the prediction of performance at other altitudes by conducting verification experiments at only a few altitude points. This reduces reliance on extreme environment laboratories and avoids blind design. Summary of the Invention
[0004] This invention provides a method for calculating the heat dissipation capacity of air coolers for converter transformers at high and low altitudes, in order to solve the problems mentioned in the background art.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A method for converting the heat dissipation capacity of air coolers for converter transformers at high and low altitudes includes the following steps: A theoretical calculation model for the heat dissipation capacity of an air cooler is constructed based on the formula for heat absorption on the air side. Based on the theoretical calculation model, the theoretical calculation values of the heat dissipation capacity of the wind cooler at different simulated altitudes are calculated. The actual values of the heat dissipation capacity of the air cooler were measured by simulating different altitudes in an extreme environment test chamber. The measured values are compared with the theoretical calculated values at the same altitude to obtain the verification results. Based on the verification results, the cooling capacity correction coefficients for different altitudes relative to the reference altitude are determined.
[0006] A further improvement of the technical solution of the present invention is that: the theoretical calculation of the heat dissipation capacity of the air cooler at different simulated altitudes includes heating the transformer oil by simulating the converter heat source through a heater, connecting it to the cooler through a pipeline, running an oil pump to force oil circulation, and running the cooler fan to dissipate heat at the same time. When the heat generation and heat dissipation tend to be balanced, the air cooler reaches its maximum heat dissipation power. At this time, the inlet and outlet oil temperature and oil flow rate of the transformer oil are measured, the actual heat dissipation power of the air cooler is calculated, and the heat dissipation power of the air cooler under different altitude environments is tested and calculated.
[0007] A further improvement to the technical solution of this invention is as follows: Simulating different altitudes through an extreme environment test chamber includes environmental conditioning using the extreme environment test chamber. Once the pressure reaches the required value, the ambient temperature is monitored. When the ambient temperature stabilizes at 30±2.5℃, the difference between the inlet oil temperature and the inlet air temperature is adjusted to stabilize the temperature difference at a fixed value within the range of 30K±2K. Temperature fluctuations are allowed to vary by no more than 0.5K within 2 hours. At this point, the inlet oil temperature, outlet oil temperature, inlet air temperature, outlet air temperature, oil flow rate, atmospheric pressure, atmospheric humidity, and air density of the air cooler are recorded. The inlet air temperature is taken as the average of all inlet air temperatures. In the extreme environment test chamber, environments at altitudes of 5000 meters, 4500 meters, 4000 meters, 3000 meters, 2000 meters, and <1000 meters are simulated to measure the heat dissipation power of the converter transformer air cooler and verify the impact of high-altitude environments on the heat dissipation efficiency of the converter transformer cooling system.
[0008] A further improvement to the technical solution of this invention is that: determining the cooling capacity correction coefficient relative to the reference altitude at different altitudes based on the verification results includes: By comparing the measured values and theoretical calculation values of air coolers of different specifications at different altitudes, the verification results of air coolers of different specifications at different altitudes were obtained. After fitting linear relationships to the verification results of air coolers of different specifications at different altitudes, common coefficients were determined and correction coefficients were obtained based on these common coefficients.
[0009] A further improvement to the technical solution of this invention is that the formula for heat absorption on the air side is: In the formula For cooling capacity, ; For traffic, ; For density, ; For specific heat capacity, ; For the temperature difference between inlet and outlet, .
[0010] A further improvement to the technical solution of the present invention is that the calculation formula for the heat dissipation capacity of the air cooler is as follows: , In the formula: For cooling capacity, ; For oil flow rate, ; The temperature is Transformer oil density at that time , ; For temperature The specific heat capacity of transformer oil at that time , ; For the imported oil temperature, ; For the outlet oil temperature, ; The formula for converting cooling capacity is: In the formula: For when Cooling capacity at that time ; For imported air temperature, .
[0011] A cooling capacity experimental system is provided for implementing the above-mentioned method for converting the heat dissipation capacity of the air cooler of a high-altitude and low-altitude converter transformer. The system comprises an oil tank, a heating element fixedly installed on the outer wall of the oil tank, a valve connected to one side of the oil tank, a pressure measuring valve fixedly connected to the other end of the valve, an oil inlet thermocouple fixedly connected to the other end of the pressure measuring valve, an air cooler fixedly installed to the other end of the oil inlet thermocouple, an oil outlet thermocouple fixedly connected to the end of the air cooler away from the oil inlet thermocouple, a flow meter fixedly connected to the end of the oil outlet thermocouple away from the air cooler, an oil pump fixedly connected to the other end of the flow meter, and the other end of the oil pump fixedly connected to the oil tank.
[0012] A further improvement of the technical solution of the present invention is that: air inlet thermocouples and air outlet thermocouples are respectively provided on both sides of the air cooler.
[0013] A further improvement to the technical solution of the present invention is that the device includes: The model building module is used to construct a theoretical calculation model of the heat dissipation capacity of the air cooler based on the formula for heat absorption on the air side. The theoretical calculation module is used to calculate the theoretical calculation value of the heat dissipation capacity of the wind cooler at different simulated altitudes based on the theoretical calculation model. The measured value module is used to measure the measured value of the heat dissipation capacity of the air cooler by simulating different altitudes in an extreme environment test chamber. The cooling capacity correction coefficient calculation module is used to compare the measured value with the theoretical calculated value at the same altitude to obtain the verification result, and to determine the cooling capacity correction coefficient for different altitudes relative to the reference altitude based on the verification result.
[0014] A computer storage medium storing a computer program or instructions, characterized in that, when the computer program or instructions are executed by a processor, the above-mentioned method for calculating the heat dissipation capacity of a high-altitude and low-altitude converter transformer air cooler is implemented.
[0015] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows: 1. This invention provides a method for converting the heat dissipation capacity of air coolers for converter transformers at high and low altitudes. A theoretical model is established based on the thermodynamic formula of the air side, quantifying the influence of air density and flow rate on heat dissipation. The model is verified through a real-world test, and the deviation between the measured value and the theoretical value is only 1% to 5%. Designers can directly predict the actual heat dissipation performance of the same cooler at high altitudes through the theoretical model, avoiding blind design. 2. This invention provides a method for converting the heat dissipation capacity of air coolers for converter transformers at high and low altitudes. By fitting test data of coolers of various specifications, a universal altitude correction coefficient is obtained, and a conversion relationship is established: Low altitude required capacity = High altitude required capacity × Correction coefficient. Designers can verify the performance of the cooler in a low-altitude laboratory to ensure that it meets the heat dissipation requirements at high altitudes, save the cost of extreme environment testing, and support rapid solution optimization, thus shortening the R&D cycle. 3. This invention provides a method for converting the heat dissipation capacity of air coolers for converter transformers at high and low altitudes. Based on a correction coefficient, it accurately converts the capacity requirements at high and low altitudes, provides a standardized experimental system, ensures data reliability, avoids over-design of cooler capacity, reduces equipment manufacturing costs, optimizes the overall transformer scheme, and reduces project investment. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the method flow of the present invention; Figure 2 This is a schematic diagram of the cooling capacity experimental system of the present invention; Figure 3 This is a topology and measurement point layout diagram of the air cooler cooling capacity test system of the present invention; Figure 4 This is a schematic diagram of the trend curve of the test results of the present invention.
[0017] In the diagram: 1. Oil tank; 2. Heating element; 3. Valve; 4. Pressure measuring valve; 5. Oil inlet thermocouple; 6. Air inlet thermocouple; 7. Oil outlet thermocouple; 8. Air cooler; 9. Air outlet thermocouple; 10. Oil pump; 11. Flow meter. Detailed Implementation
[0018] The present invention will be further described in detail below with reference to embodiments: Example 1
[0019] like Figure 1-4 As shown, this invention provides a method for converting the heat dissipation capacity of air coolers for converter transformers at high and low altitudes, including the following steps: S1: Establish a theoretical calculation model for the heat dissipation capacity of the air cooler, based on the formula for heat absorption on the air side: In the formula For cooling capacity, ; For traffic, ; For density, ; For specific heat capacity, ; For the temperature difference between inlet and outlet, ; S2: Test the heat dissipation capacity of the air cooler for converter transformers, including the following steps: A1: Converter transformer air cooler test: The heater simulates the heat source of the converter transformer to heat the transformer oil. It is connected to the cooler through the pipeline. The oil pump is run to force the oil to circulate. At the same time, the cooler fan is run to dissipate heat. When the heat generation and heat dissipation tend to be balanced, the air cooler reaches the maximum heat dissipation power. At this time, the inlet and outlet oil temperature and oil flow rate of the transformer oil are measured. The actual heat dissipation power of the air cooler can be calculated from these data. According to the above principle, the heat dissipation power of the air cooler under different altitude environments is tested and calculated. A2: Calculation of cooling capacity: In the formula: For cooling capacity, ; For oil flow rate, ; The temperature is Transformer oil density at that time , ; For temperature The specific heat capacity of transformer oil at that time , ; For the imported oil temperature, ; For the outlet oil temperature, ; The formula for converting cooling capacity is: ; In the formula: For when Cooling capacity at that time ; For imported air temperature,
[0020] A3: Air Cooler Test: Environmental conditioning is conducted using an extreme environment test chamber. Once the pressure reaches the required value, the ambient temperature is monitored. When the ambient temperature stabilizes at 30±2.5℃, the difference between the inlet oil temperature and the inlet air temperature is adjusted to stabilize the temperature difference at a fixed value within the range of 30K±2K. The temperature difference fluctuation is allowed to be no more than 0.5K within 2 hours. At this point, data such as the inlet oil temperature, outlet oil temperature, inlet air temperature, outlet air temperature, oil flow rate, atmospheric pressure, atmospheric humidity, and air density of the air cooler are recorded. The inlet air temperature is taken as the average of all inlet air temperatures. S3: Verify the accuracy of the theoretical model through real-world testing: Measure the actual heat dissipation capacity of the air cooler at different simulated altitudes of 100m, 2000m, 3000m, 4000m, 4500m, and 5000m; compare the measured values with the theoretical calculation values at the same altitude, controlling the deviation within 1% to 5%; and based on the verification results, determine the cooling capacity correction coefficient for different altitudes relative to the 100m reference altitude.
[0021] In this embodiment, the test results of the air cooler are shown in Table 1 below: Table 1 Serial Number Altitude (m) Test results at a temperature rise of 30K, kW 1 100 512 2 2000 457 3 3000 430 4 4000 424 5 4500 389 6 5000 375 By combining theoretical and test values for analysis, and based on the trend curve formed by the test results, an anomaly was found in the data at an altitude of 4000 meters. After removing this data, a fitted line was formed. The corrected heat dissipation capacity values of the air cooler at different altitudes are summarized in Table 2 below: Table 2 altitude m Theoretical calculation kW Test results at 30K temperature rise (kW) Test results after curve correction (kW) Deviation from design value 100 502 512 512 102.0% 2000 452 457 457 101.1% 3000 423 430 430 101.7% 4000 391 424 401 102.6% 4500 374 389 389 104.0% 5000 356 375 375 105.3% The results in the table above show that the corrected test cooling capacity value is higher than the theoretical calculation value, with a deviation within the range of 1% to 5%. The theoretically calculated heat dissipation data of the air cooler is in high agreement with the measured value, proving that the heat dissipation capacity calculation scheme of the cooler is reliable and the calculated value is accurate, and it can be used for engineering applications. Example 2
[0022] like Figure 1-4As shown, based on Example 1, the present invention provides a technical solution: Preferably, in step A3, according to the environmental characteristics of high altitude, low air density, and large diurnal temperature difference, the environment at altitudes of 5000 meters, 4500 meters, 4000 meters, 3000 meters, 2000 meters and <1000 meters is simulated in an extreme environment laboratory to conduct heat dissipation power measurement of the converter transformer air cooler, and to test and verify the influence of high altitude environment on the heat dissipation efficiency of the converter transformer cooling system. The correction coefficient in step S3 is a common coefficient uniformly determined by comparing the theoretical calculated capacity and test capacity of multiple specifications of air coolers at different altitudes and fitting a linear relationship. Moreover, the required altitude is achieved by controlling atmospheric pressure during the test process.
[0023] In this embodiment, since the heat dissipation capacity calculation scheme in Embodiment 1 is accurate, the heat dissipation capacity values of various product specifications at different altitudes are obtained using this method. Comparative analysis shows a certain linear relationship between the capacity value at the same altitude and the capacity value at a lower altitude of 100 meters. The correction coefficient for this linear relationship can be derived. This provides the correction coefficients for the calculated and tested capacity values of the real-world test cooler at different altitudes. The relationship between the calculated capacity and the tested capacity of the air cooler sample at different altitudes is shown in Table 3 below: Table 3 altitude m Calculate the capacity value in kW Altitude capacity correction factor (based on cooling capacity at 100 meters altitude) Test capacity value kW Altitude capacity correction factor (based on cooling capacity at 100 meters altitude) 100 502 1.0 512 1.0 2000 452 1.11 457 1.12 3000 423 1.19 430 1.19 4000 391 1.28 401 1.28 4500 374 1.34 389 1.32 5000 356 1.41 375 1.37 Using the same calculation scheme, the heat dissipation power of other specifications of coolers was calculated again, and the cooling capacity correction coefficient at different altitudes was analyzed. The relationship between the air-cooled capacity of two specifications at different altitudes is shown in Table 4 below: Table 4 altitude m Theoretical calculation kW Altitude capacity correction factor (based on cooling capacity at 100 meters altitude) 100 351 1.0 2000 318.3 1.10 3000 299.3 1.17 4000 278.3 1.26 4500 267.1 1.31 5000 255.3 1.37 Analysis of the above data shows that cooling capacity decreases with increasing altitude. Different product specifications exhibit very similar patterns of change. Therefore, a common rule can be derived: "cooling capacity correction coefficient for air coolers at different altitudes." Coolers at high altitudes have a certain heat dissipation capacity. When the same cooler is placed at a low altitude, the capacity needs to be corrected. Suggested correction values are shown in Table 5 below. Table 5 altitude m Theoretical calculation kW Altitude capacity correction factor (based on cooling capacity at 100 meters altitude) 100 506.2 1.0 2000 461.5 1.10 3000 435.2 1.16 4000 406 1.25 4500 390.3 1.30 5000 373.7 1.35 Table 6 below shows the correction factors for the cooling capacity of the air cooler at different altitudes: Table 6 Altitude Capacity correction factor (based on cooling capacity at 100 meters altitude) 100 meters 1.0 2000 meters 1.15 3000 meters 1.2 4000 meters 1.3 4500 meters 1.35 5000 meters 1.4 For example, at an altitude of 4000 meters, a 400kW air cooler is needed. Therefore, at an altitude of 100 meters, the cooling capacity of the cooler would be 400kW × 1.3 = 520kW. The correction value can be used to quickly convert the required capacity under high altitude conditions to the capacity value under low altitude conditions. This can help designers verify the performance of the cooler under low altitude conditions to ensure the heat dissipation capacity performance of the cooler at high altitudes. At the same time, it can optimize the overall cost of the transformer scheme and reduce project investment. Example 3
[0024] like Figure 1-4 As shown, based on Embodiment 1, the present invention provides a technical solution: preferably, it includes a cooling capacity experimental system, the system including an oil tank 1, a heating element 2 fixedly installed on the outer wall of the oil tank 1, a valve 3 connected to one side of the oil tank 1, a pressure measuring valve 4 fixedly connected to the other end of the valve 3, an oil inlet thermocouple 5 fixedly connected to the other end of the pressure measuring valve 4, an air cooler 8 fixedly installed to the other end of the oil inlet thermocouple 5, an oil outlet thermocouple 7 fixedly connected to the end of the air cooler 8 away from the oil inlet thermocouple 5, a flow meter 11 fixedly connected to the end of the oil outlet thermocouple 7 away from the air cooler 8, an oil pump 10 fixedly connected to the other end of the flow meter 11, and an air inlet thermocouple 6 and an air outlet thermocouple 9 respectively provided on both sides of the air cooler 8.
[0025] In this embodiment, the oil tank 1 is used to store transformer oil as a heat circulation medium. The heating element 2 is fixed to the outer wall of the oil tank to simulate the heat source of the converter and heat the transformer oil. The oil pump 10 drives the transformer oil to circulate in a forced manner. The flow rate is monitored by the flow meter 11. The valve 3 and the pressure measuring valve 4 regulate the oil circuit pressure and monitor the oil pressure. The oil inlet thermocouple 5 measures the oil temperature entering the air cooler, and the oil outlet thermocouple 7 measures the oil temperature leaving the air cooler. The air cooler 8 is the core heat dissipation component, which contains cooling pipes and fins. The air inlet thermocouple 6 measures the ambient air inlet temperature, and the air outlet thermocouple 9 measures the air outlet temperature. Example 4
[0026] like Figure 1-4 As shown, the present invention also provides a device for converting the heat dissipation capacity of air coolers for high and low altitude converter transformers. This device can be implemented through a computer system and includes the following modules: The model building module is used to build upon the air-side heat absorption formula. Construct a theoretical calculation model for the heat dissipation capacity of the air cooler; this module receives environmental parameters and cooler structural parameters input by the user, and outputs the theoretical model expression and initial calculation parameters; The theoretical calculation module is used to calculate the theoretical value of the heat dissipation capacity of the air cooler based on the theoretical calculation model and the atmospheric pressure and air density data at different simulated altitudes. This module supports batch calculation of multiple altitude points and outputs a table or curve of the theoretical heat dissipation capacity. The measured value module is used to receive measured data collected in the extreme environment test chamber, including oil temperature, air temperature, oil flow rate, atmospheric pressure, humidity, etc., and calculate the measured heat dissipation capacity; this module has a data verification function to ensure the validity of the data; The cooling capacity correction factor calculation module is used to compare and analyze the measured values and theoretical calculation values at the same altitude, calculate the deviation rate, and fit the relationship curve between altitude and cooling capacity correction factor based on multiple sets of data, and output the correction factor table; This device can be implemented using an industrial computer or embedded system, has a human-machine interface, supports data import and export, graphical display and report generation functions, and is suitable for the design and verification of converter transformer cooling systems. Example 5
[0027] The present invention also provides a computer storage medium, such as an optical disc, a USB flash drive, a hard disk, or a cloud storage server, on which a computer program or instructions are stored. When executed by a processor, the program implements the heat dissipation capacity conversion method for high and low altitude converter transformer air coolers as claimed in claims 1 to 6. The program includes the following functional modules: The data input module is used to receive user input of altitude, environmental parameters, and cooler model. The theoretical calculation module calculates heat dissipation capacity based on air-side thermodynamic formulas. The measured data processing module performs preprocessing on the experimentally collected data, including filtering, averaging, and unit conversion. The deviation analysis and correction coefficient generation module performs data fitting and outputs coefficients. The results output module generates test reports, correction coefficient tables, or graphical results. The storage medium can be a non-volatile memory, and the program code is written in C++, Python, or MATLAB. It is suitable for Windows, Linux, or embedded operating systems and has good portability and compatibility.
[0028] The working principle of the method for converting the heat dissipation capacity of the air cooler of the high and low altitude converter transformer will be explained in detail below.
[0029] like Figure 1-4As shown, heating element 2 heats the transformer oil in oil tank 1, simulating the heat source of the converter transformer operation. Oil pump 10 drives the hot oil to flow through valve 3, through oil inlet thermocouple 5, into air cooler 8, and then through oil outlet thermocouple 7. After passing through flow meter 11, it returns to oil tank 1. The fan of air cooler 8 starts, and air flows through the fins to absorb heat from the oil. The heating power and fan speed are adjusted until the heat generation equals the heat dissipation and the oil temperature stabilizes. Under thermal equilibrium, the following are recorded: oil side: inlet oil temperature, outlet oil temperature, oil flow rate; air side: inlet air temperature, outlet air temperature, atmospheric pressure, humidity, air density; environmental parameters: atmospheric pressure and ambient temperature used to simulate altitude.
[0030] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.
Claims
1. A method for converting the heat dissipation capacity of a high-altitude and low-altitude converter transformer air cooler, characterized in that: Includes the following steps: A theoretical calculation model for the heat dissipation capacity of an air cooler is constructed based on the formula for heat absorption on the air side. Based on the theoretical calculation model, the theoretical calculation values of the heat dissipation capacity of the wind cooler at different simulated altitudes are calculated. The actual values of the heat dissipation capacity of the air cooler were measured by simulating different altitudes in an extreme environment test chamber. The measured values are compared with the theoretical calculated values at the same altitude to obtain the verification results. Based on the verification results, the cooling capacity correction coefficients for different altitudes relative to the reference altitude are determined.
2. The method for converting the heat dissipation capacity of a high-altitude and low-altitude converter transformer air cooler according to claim 1, characterized in that: The theoretical calculation of the heat dissipation capacity of the air cooler at different simulated altitudes includes heating the transformer oil by simulating a converter heat source through a heater, connecting it to the cooler through a pipeline, running an oil pump for forced oil circulation, and simultaneously running the cooler fan for heat dissipation. When the heat generation and heat dissipation tend to be balanced, the air cooler reaches its maximum heat dissipation power. At this time, the inlet and outlet oil temperatures and oil flow rates of the transformer oil are measured to calculate the actual heat dissipation power of the air cooler. The heat dissipation power of the air cooler under different altitude environments is also tested and calculated.
3. The method for converting the heat dissipation capacity of a high-altitude and low-altitude converter transformer air cooler according to claim 1, characterized in that: The simulation of different altitudes in the extreme environment test chamber includes environmental conditioning. Once the pressure reaches the required value, the ambient temperature is monitored. When the ambient temperature stabilizes at 30±2.5℃, the difference between the inlet oil temperature and the inlet air temperature is adjusted to stabilize the temperature difference at a fixed value within the range of 30K±2K. The temperature difference fluctuation is allowed to be no more than 0.5K within 2 hours. At this time, the inlet oil temperature, outlet oil temperature, inlet air temperature, outlet air temperature, oil flow rate, atmospheric pressure, atmospheric humidity, and air density of the air cooler are recorded. The inlet air temperature is taken as the average of all inlet air temperatures. In the extreme environment laboratory, environments at altitudes of 5000 meters, 4500 meters, 4000 meters, 3000 meters, 2000 meters, and <1000 meters are simulated to measure the heat dissipation power of the converter transformer air cooler and verify the impact of high-altitude environment on the heat dissipation efficiency of the converter transformer cooling system.
4. The method for converting the heat dissipation capacity of a high-altitude and low-altitude converter transformer air cooler according to claim 1, characterized in that: The determination of the cooling capacity correction factor relative to the reference altitude at different altitudes based on the verification results includes: By comparing the measured values and theoretical calculation values of air coolers of different specifications at different altitudes, the verification results of air coolers of different specifications at different altitudes were obtained. After fitting linear relationships to the verification results of air coolers of different specifications at different altitudes, common coefficients were determined and correction coefficients were obtained based on these common coefficients.
5. The method for converting the heat dissipation capacity of a high-altitude and low-altitude converter transformer air cooler according to claim 1, characterized in that: The formula for heat absorption on the air side is: In the formula For cooling capacity, ; For traffic, ; For density, ; For specific heat capacity, ; For the temperature difference between inlet and outlet, .
6. The method for converting the heat dissipation capacity of a high-altitude and low-altitude converter transformer air cooler according to claim 1, characterized in that: The formula for calculating the heat dissipation capacity of the air cooler is as follows: In the formula: For cooling capacity, ; For oil flow rate, ; The temperature is Transformer oil density at that time , ; For temperature The specific heat capacity of transformer oil at that time , ; The temperature of the imported oil is ℃; The outlet oil temperature is ℃; The formula for converting cooling capacity is: In the formula: For when Cooling capacity at that time ; The temperature of the imported air is ℃.
7. A cooling capacity experimental system for implementing the heat dissipation capacity conversion method for high and low altitude converter transformer air coolers as described in any one of claims 1 to 6, characterized in that: The system includes an oil tank (1), a heating element (2) is fixedly installed on the outer wall of the oil tank (1), a valve (3) is connected to one side of the oil tank (1), a pressure measuring valve (4) is fixedly connected to the other end of the valve (3), an oil inlet thermocouple (5) is fixedly connected to the other end of the pressure measuring valve (4), an air cooler (8) is fixedly installed to the other end of the oil inlet thermocouple (5), an oil outlet thermocouple (7) is fixedly connected to the end of the air cooler (8) away from the oil inlet thermocouple (5), a flow meter (11) is fixedly connected to the end of the oil outlet thermocouple (7) away from the air cooler (8), an oil pump (10) is fixedly connected to the other end of the flow meter (11), and the other end of the oil pump (10) is fixedly connected to the oil tank (1).
8. The cooling capacity experimental system according to claim 7, characterized in that: The air cooler (8) is equipped with an air inlet thermocouple (6) and an air outlet thermocouple (9) on both sides.
9. A device for converting the heat dissipation capacity of a high-altitude and low-altitude converter transformer air cooler, characterized in that, The device includes: The model building module is used to construct a theoretical calculation model of the heat dissipation capacity of the air cooler based on the formula for heat absorption on the air side. The theoretical calculation module is used to calculate the theoretical calculation value of the heat dissipation capacity of the wind cooler at different simulated altitudes based on the theoretical calculation model. The measured value module is used to measure the measured value of the heat dissipation capacity of the air cooler by simulating different altitudes in an extreme environment test chamber. The cooling capacity correction coefficient calculation module is used to compare the measured value with the theoretical calculated value at the same altitude to obtain the verification result, and to determine the cooling capacity correction coefficient for different altitudes relative to the reference altitude based on the verification result.
10. A computer storage medium having a computer program or instructions stored thereon, characterized in that, When the computer program or instructions are executed by the processor, they implement the heat dissipation capacity conversion method for high and low altitude converter transformer air coolers as described in any one of claims 1 to 6.