Dry-type reactor dc resistance test and state evaluation method, device and system

Abstract

This application relates to a method, apparatus, and system for testing the DC resistance and assessing the condition of a dry-type reactor. The method includes: acquiring the ambient temperature of the dry-type reactor; acquiring the collected dry-type reactor temperature and processing it to obtain the average temperature of the dry-type reactor; adjusting the temperature of the dry-type reactor based on the ambient temperature and the average temperature of the dry-type reactor to achieve a stable heat exchange state between the reactor and the ambient temperature; acquiring the DC resistance value of the dry-type reactor when the temperature of the dry-type reactor reaches a stable heat exchange state; converting the DC resistance value into the actual DC resistance value of the dry-type reactor at its factory temperature; comparing the actual DC resistance value with the factory DC resistance value of the dry-type reactor; and assessing the condition of the dry-type reactor based on the comparison result. This method can solve the problem of the DC resistance testing of dry-type reactors being limited by meteorological conditions.

Description

Technical Field

[0001] This application relates to the field of reactor testing technology, and in particular to a method, apparatus and system for testing the DC resistance and assessing the condition of a dry-type reactor. Background Technology

[0002] With the continuous development of my country's power system, AC / DC dry-type reactors have been widely used in ultra-high voltage and extra-high voltage power systems due to their simple structure and low operation and maintenance costs. During operation, dry-type reactors are not only subjected to the long-term impact of various system harmonics, causing the coils to accumulate electrodynamic forces and leading to winding breaks and inter-turn short circuits; they are also affected by external environmental factors such as earthquakes, ultraviolet radiation, and large diurnal temperature differences, causing the encapsulation to age and crack, resulting in interlayer or inter-turn insulation failure. Therefore, it is necessary to test the DC resistance of dry-type reactors and promptly identify and address any potential hazards.

[0003] In traditional techniques, when testing the DC resistance of dry-type reactors, the temperature measurement method mostly involves measuring the ambient temperature and assuming it to be the reactor's temperature before starting the measurement. However, to obtain more accurate data, the dry-type reactor needs to be in a stable environment with no sunlight, no wind, and no rain or snow to ensure a certain level of accuracy. However, the time available for stable weather conditions each day is limited, and the testing window for dry-type reactors is also short. This limitation imposed by weather conditions severely affects the DC resistance testing of dry-type reactors. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, apparatus, and system for testing and assessing the DC resistance of dry reactors that can solve the problem of DC resistance testing of dry reactors being limited by meteorological conditions.

[0005] In a first aspect, this application provides a method for testing the DC resistance and assessing the condition of a dry-type reactor, the method comprising:

[0006] Obtain the ambient temperature of the dry-type reactor;

[0007] The collected dry-type reactor temperature is obtained, and the dry-type reactor temperature is processed to obtain the average temperature of the dry-type reactor.

[0008] Based on the ambient temperature and the average temperature of the dry-type reactor, the temperature of the dry-type reactor is adjusted so that the temperature of the dry-type reactor and the ambient temperature reach a stable state of heat exchange.

[0009] Obtain the DC resistance value of the dry reactor when the temperature of the dry reactor reaches a stable state of heat exchange with the ambient temperature;

[0010] The DC resistance value is converted into the actual DC resistance value of the dry-type reactor at the factory temperature. The actual DC resistance value is compared with the factory DC resistance value of the dry-type reactor. The condition of the dry-type reactor is evaluated based on the comparison result.

[0011] In one embodiment, acquiring the collected dry-type reactor temperature and processing the dry-type reactor temperature to obtain the average temperature of the dry-type reactor includes:

[0012] Acquire the internal wall temperature data of the dry reactor from the internal wall sensor;

[0013] Acquire the temperature data of the outer wall of the dry reactor from the sensors on the outer wall of the dry reactor;

[0014] Anomaly detection was performed on the inner wall temperature data and outer wall temperature data of the dry-type reactor.

[0015] After checking for abnormal data, the maximum and minimum values ​​of the inner and outer wall temperature data of the dry-type reactor are selected and averaged to obtain the average temperature of the dry-type reactor.

[0016] In one embodiment, the abnormal data investigation of the inner wall temperature data and the outer wall temperature data of the dry-type reactor includes:

[0017] Based on the temperature deviation range corresponding to the ambient temperature, abnormal data are investigated for the inner wall temperature data and the outer wall temperature data of the dry reactor.

[0018] In one embodiment, the step of adjusting the temperature of the dry-type reactor based on the ambient temperature and the average temperature of the dry-type reactor to achieve a stable heat exchange state between the temperature of the dry-type reactor and the ambient temperature includes:

[0019] If the ambient temperature is lower than the average temperature of the dry-type reactor, the temperature of the dry-type reactor and the ambient temperature reach a stable state of heat exchange.

[0020] If the ambient temperature is greater than the average temperature of the dry-type reactor, and the difference between the ambient temperature and the average temperature of the dry-type reactor is within the set adjustable range, then the temperature of the dry-type reactor and the ambient temperature have not reached a stable state of heat exchange. The set amplitude current is output to the dry-type reactor, and the process of acquiring the collected dry-type reactor temperature and processing the dry-type reactor temperature to obtain the average temperature of the dry-type reactor is returned.

[0021] If the ambient temperature is greater than the average temperature of the dry-type reactor, and the difference between the ambient temperature and the average temperature of the dry-type reactor is outside the set adjustable range, then the dry-type reactor temperature and the ambient temperature have not exchanged heat. The process returns to the step of acquiring the collected dry-type reactor temperature and processing the dry-type reactor temperature to obtain the average temperature of the dry-type reactor.

[0022] In one embodiment, the condition assessment of the dry-type reactor based on the comparison results includes:

[0023] When the deviation between the actual DC resistance value and the factory DC resistance value is less than or equal to the set deviation value, the dry-type reactor is judged to be normal.

[0024] When the deviation between the actual DC resistance value and the factory DC resistance value is greater than the set deviation value, the dry-type reactor is judged to be abnormal, and an inspection prompt message is output.

[0025] In one embodiment, the number of dry-type reactors is two or more. After converting the DC resistance value to the actual DC resistance value of the dry-type reactor at its factory temperature, comparing the actual DC resistance value with the factory DC resistance value of the dry-type reactor, and performing a condition assessment of the dry-type reactor based on the comparison result, the method further includes:

[0026] The arithmetic average of the actual DC resistance values ​​obtained from the measurement of each dry-type reactor is calculated to obtain the average actual DC resistance.

[0027] The arithmetic average of the factory DC resistance values ​​of each dry-type reactor is calculated to obtain the average factory DC resistance.

[0028] Based on the actual average DC resistance and the factory average DC resistance, the variance of the actual DC resistance and the variance of the factory DC resistance are obtained respectively.

[0029] Divide the actual DC resistance variance by the factory DC resistance variance to obtain the variance ratio.

[0030] The variance ratio is compared with the variance ratio threshold corresponding to the set confidence level, and the overall test error analysis of each dry reactor in this measurement is obtained based on the comparison results.

[0031] In one embodiment, after converting the DC resistance value to the actual DC resistance value of the dry-type reactor at the factory temperature, comparing the actual DC resistance value with the factory DC resistance value of the dry-type reactor, and performing a condition assessment of the dry-type reactor based on the comparison result, the method further includes:

[0032] The actual DC resistance value obtained from this measurement of the dry-type reactor is compared with all previous actual DC resistance values. Then, the standard deviation of the difference is calculated to obtain the test value.

[0033] The detected value is compared with the detection threshold corresponding to the set significance level, and the operating status of the dry reactor is evaluated and analyzed based on the comparison result.

[0034] Secondly, this application also provides a device for testing and assessing the DC resistance of a dry-type reactor, the device comprising:

[0035] An ambient temperature measurement module is used to obtain the ambient temperature where the dry-type reactor is located.

[0036] The dry-type reactor temperature measurement module is used to acquire the collected dry-type reactor temperature and process the dry-type reactor temperature to obtain the average temperature of the dry-type reactor.

[0037] The temperature control module is used to adjust the temperature of the dry reactor according to the ambient temperature and the average temperature of the dry reactor, so that the temperature of the dry reactor and the ambient temperature reach a stable state of heat exchange.

[0038] The test module is used to obtain the DC resistance value of the dry reactor when the temperature of the dry reactor reaches a stable state of heat exchange with the ambient temperature.

[0039] The analysis module is used to convert the DC resistance value into the actual DC resistance value of the dry-type reactor at the factory temperature, compare the actual DC resistance value with the factory DC resistance value of the dry-type reactor, and perform a condition assessment of the dry-type reactor based on the comparison result.

[0040] Thirdly, this application also provides a dry-type reactor DC resistance testing and condition assessment system, the system including a dry-type reactor DC resistance testing device and a temperature sensor, the dry-type reactor DC resistance testing device and the temperature sensor being wirelessly connected, the dry-type reactor DC resistance testing device being used to perform DC resistance testing and condition assessment on the dry-type reactor according to the above method.

[0041] In one embodiment, the dry reactor DC resistance testing device includes a housing, a test port, a wireless communication unit, an ambient temperature measurement unit, an interactive device, and a control board. The control board is disposed inside the housing, and the test port, the ambient temperature measurement unit, and the interactive device are all disposed on the housing and connected to the control board. The wireless communication unit communicates with the temperature sensor and is connected to the control board.

[0042] The aforementioned method, apparatus, and system for testing and assessing the DC resistance of dry-type reactors compare the ambient temperature with the dry-type reactor temperature. The test begins after the dry-type reactor temperature is adjusted to a stable heat exchange state with the ambient temperature, and then the DC resistance value is calculated. Because the temperature of the dry-type reactor at which it has reached a stable heat exchange state with the ambient temperature is directly obtained, it is no longer limited by meteorological conditions, thus solving the problem of meteorological conditions affecting the efficiency of DC resistance testing of dry-type reactors. Attached Figure Description

[0043] Figure 1 This is a diagram illustrating the application environment of a method for testing the DC resistance and assessing the condition of a dry reactor in one embodiment.

[0044] Figure 2 This is a flowchart illustrating a method for testing the DC resistance and assessing the condition of a dry-type reactor in one embodiment.

[0045] Figure 3 This is a schematic diagram illustrating the process of obtaining the collected dry-type reactor temperature and processing it to obtain the average temperature of the dry-type reactor in one embodiment.

[0046] Figure 4 This is a schematic diagram of a process in one embodiment where the temperature of a dry-type reactor is adjusted according to the ambient temperature and the average temperature of the dry-type reactor so that the temperature of the dry-type reactor reaches a stable state of heat exchange with the ambient temperature.

[0047] Figure 5 This is a flowchart illustrating the process of converting a DC resistance value into the actual DC resistance value of a dry-type reactor at the factory temperature, comparing the actual DC resistance value with the factory DC resistance value of the dry-type reactor, and performing a condition assessment of the dry-type reactor based on the comparison result in one embodiment.

[0048] Figure 6 This is a structural block diagram of a dry reactor DC resistance testing and condition assessment device in one embodiment;

[0049] Figure 7 This is a schematic diagram of the structure of a dry reactor DC resistance testing device in a dry reactor DC resistance testing and condition assessment system in one embodiment. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0051] The method for testing the DC resistance and assessing the condition of dry-type reactors provided in this application can be applied to, for example... Figure 1The application environment is shown. The dry-type reactor 100 can be a dry-type reactor in a substation or converter station, and a terminal block 101 is installed on the dry-type reactor 100. A temperature sensor 102 is installed on the dry-type reactor 100, either on its inner or outer wall. A dry-type reactor DC resistance testing device 104 communicates with the temperature sensor 102 wirelessly to acquire the data measured by the temperature sensor 102. The dry-type reactor DC resistance testing device 104 is connected to the terminal block 101 on the dry-type reactor 100 via a wired connection to adjust the temperature of the dry-type reactor 100. The dry-type reactor DC resistance testing device 104 includes a housing, a test port, a wireless communication unit, an ambient temperature measurement unit, an interactive device, and a control board. The control board is located inside the housing, while the test port, ambient temperature measurement unit, and interactive device are all located on the housing and connected to the control board. The wireless communication unit communicates with the temperature sensor 102 and is connected to the control board. The wireless communication unit can receive the temperature of the dry-type reactor measured by the temperature sensor 102 and transmit it to the control board. The control board of the dry-type reactor DC resistance testing device 104 performs calculations and analysis on various data. The interactive device may include function buttons and a display screen. The function buttons can be used to select functions to execute different commands, and the display screen can be used to display the calculation and analysis results.

[0052] In one embodiment, such as Figure 2 As shown, a method for testing the DC resistance and assessing the condition of a dry-type reactor is provided, which can be applied to... Figure 1 Taking the DC resistance testing device for a dry-type reactor as an example, the following steps are included:

[0053] Step 202: Obtain the ambient temperature of the dry-type reactor.

[0054] A dry-type reactor is a circuit device that prevents changes in current. It is typically wound into a solenoid shape and has a hollow structure. The temperature of the air surrounding the dry-type reactor is called the ambient temperature. Specifically, the dry-type reactor DC resistance testing device and the dry-type reactor are placed in the same environment. The dry-type reactor DC resistance testing device has an ambient temperature measurement unit that continuously measures the ambient temperature and outputs the ambient temperature value to the control board inside the device. Furthermore, the control board can correct the ambient temperature value based on environmental factors such as wind speed and sunlight, obtaining the corrected ambient temperature for subsequent data analysis.

[0055] Step 204: Obtain the collected dry-type reactor temperature and process the dry-type reactor temperature to obtain the average temperature of the dry-type reactor.

[0056] Temperature sensors are installed on the inner and outer walls of the dry-type reactor. The temperature data obtained by each temperature sensor is the temperature of the dry-type reactor. After being processed by the dry-type reactor DC resistance testing device, the average temperature of the dry-type reactor is obtained.

[0057] Specifically, before testing the temperature of a dry-type reactor, if the test is being conducted on a dry-type reactor currently in operation, it is necessary to disconnect one lead from the reactor to break it out of the working circuit. During measurement, the operator needs to place a temperature sensor on the inner or outer wall of the dry-type reactor and establish a wireless communication connection between the temperature sensor and the DC resistance testing device to obtain the reactor temperature. The temperature measured by the temperature sensor is received by the wireless communication unit of the DC resistance testing device and transmitted to the control board. The control board processes the reactor temperature according to the set abnormal data troubleshooting conditions and then calculates the average temperature of the dry-type reactor from the processed temperature readings.

[0058] Furthermore, the temperature sensor should be a wireless temperature sensor, such as a thermocouple sensor. The temperature sensor can be mounted on the dry-type reactor. To ensure stable and reliable data, there should be no fewer than two temperature sensors. The temperature sensors should be a certain distance from the edge of the dry-type reactor, and the temperature sensors should be evenly distributed on the dry-type reactor, for example, arranged in a 6x8 matrix.

[0059] Step 206: Adjust the temperature of the dry-type reactor according to the ambient temperature and the average temperature of the dry-type reactor so that the temperature of the dry-type reactor reaches a stable state of heat exchange with the ambient temperature.

[0060] Temperature regulation of a dry-type reactor is achieved by outputting a current of a certain amplitude to the dry-type reactor to change its temperature. The stable state of heat exchange refers to the process where two objects with different temperatures come into contact with each other, and energy is transferred between them, gradually reducing the temperature difference until thermal equilibrium is reached. When the temperature of the dry-type reactor is higher than the ambient temperature, it can be determined that the temperature of the dry-type reactor and the ambient temperature have reached a stable state of heat exchange.

[0061] Specifically, the dry-type reactor DC resistance testing device is equipped with test ports, namely a current output terminal, a voltage output terminal, a voltage input terminal, and a current input terminal. The test ports are connected to connecting wires and externally connected to the terminal blocks at both ends of the dry-type reactor. The dry-type reactor DC resistance testing device compares the obtained ambient temperature with the average temperature of the dry-type reactor. Based on the comparison result, it determines whether the temperature of the dry-type reactor has reached a stable state of heat exchange with the ambient temperature. If the heat exchange has not reached a stable state, the device outputs a set regulating current to the dry-type reactor to achieve temperature regulation.

[0062] Step 208: Obtain the DC resistance value of the dry reactor when the temperature of the dry reactor reaches a stable state of heat exchange with the ambient temperature.

[0063] Specifically, when the temperature of the dry-type reactor reaches a stable state of heat exchange with the ambient temperature, the dry-type reactor DC resistance testing device connects to the dry-type reactor through the test port to obtain the actual test voltage and actual test current of the dry-type reactor at this time. The actual test voltage is divided by the actual test current to obtain the DC resistance value of the dry-type reactor.

[0064] Step 209: Convert the DC resistance value into the actual DC resistance value of the dry-type reactor at the factory temperature, compare the actual DC resistance value with the factory DC resistance value of the dry-type reactor, and perform a condition assessment of the dry-type reactor based on the comparison result.

[0065] Each dry-type reactor is tested at the factory temperature after manufacturing to obtain a DC resistance value, which is generally used as the reference value for measuring the DC resistance of the dry-type reactor.

[0066] Specifically, the formula for converting the DC resistance value of a dry-type reactor to its actual DC resistance value at the factory temperature is as follows:

[0067]

[0068] Where: R 换算 This represents the actual DC resistance value of the dry-type reactor obtained in this test, converted to the value at the factory temperature, in mΩ; R 实测 Tc represents the DC resistance of the dry-type reactor measured at ambient temperature during this test, in mΩ; Tc represents the average temperature of the dry-type reactor body during the factory test, in °C; T 测 This indicates the average temperature of the reactor body during this test, expressed in °C.

[0069] After performing the above calculation, the actual DC resistance value of the dry-type reactor at the factory temperature is obtained. The difference between this actual DC resistance value and the factory DC resistance value of the dry-type reactor is then calculated. This difference is divided by the factory DC resistance value to obtain the resistance deviation value. When the resistance deviation value is less than or equal to 1%, the dry-type reactor tested can be assessed as operating normally. When the resistance deviation value is greater than 1%, the dry-type reactor tested can be assessed as operating abnormally. The interactive device of the dry-type reactor DC resistance testing device can also issue a prompt message, reminding the operator to check the leads of the dry-type reactor.

[0070] In the aforementioned method for testing and assessing the DC resistance of dry-type reactors, a sensor mounted on the dry-type reactor is used to detect its temperature, accurately measuring the temperature. By comparing this temperature with the ambient temperature, the reactor temperature is adjusted to achieve a stable heat exchange state, thus accurately completing the DC resistance test. Because the temperature of the dry-type reactor at a stable heat exchange state with the ambient temperature is directly obtained, it is no longer limited by weather conditions, solving the problem of weather conditions affecting the efficiency of DC resistance testing of dry-type reactors.

[0071] Multiple temperature sensors acquire temperature data from multiple dry-type reactors. In one embodiment, the collected dry-type reactor temperatures are acquired and processed to obtain the average temperature of the dry-type reactors, including steps 302, 304, 306, and 308.

[0072] Step 302: Obtain the inner wall temperature data of the dry reactor collected by the inner wall sensor of the dry reactor.

[0073] Step 304: Obtain the temperature data of the outer wall of the dry reactor collected by the sensor on the outer wall of the dry reactor.

[0074] Specifically, the dry-type reactor DC resistance testing device acquires temperature sensor information received by the wireless communication unit, and obtains the dry-type reactor temperature data collected by various sensors on the inner and outer walls.

[0075] Step 306: Check for abnormal data in the inner wall temperature data and outer wall temperature data of the dry-type reactor.

[0076] Specifically, improper temperature sensor settings or sensor malfunctions may cause inaccurate temperature readings from the dry-type reactor. In such cases, it is necessary to troubleshoot the abnormal temperature data. Temperature sensors located on the outer wall and those located on the inner wall may produce significantly different temperatures due to differences in airflow. Therefore, it is necessary to separate the external and internal wall temperature data of the dry-type reactor for abnormal data troubleshooting.

[0077] Step 308: From the dry-type reactor inner wall temperature data and dry-type reactor outer wall temperature data after abnormal data investigation, select the maximum and minimum values ​​and calculate the average value to obtain the dry-type reactor average temperature.

[0078] Specifically, after checking for abnormal data, a maximum value and a minimum value were selected from all the internal and external wall temperature data of the dry-type reactors. The average value of the selected maximum and minimum values ​​was then used as the average temperature of the dry-type reactor under the ambient temperature during this test.

[0079] In this embodiment, temperature sensors installed on the dry-type reactor collect temperature data of the inner wall and outer wall of the dry-type reactor. Abnormal data in the inner and outer wall temperature data of the dry-type reactor are investigated to make the obtained average temperature of the dry-type reactor more accurate, thereby achieving the effect of making the subsequent test of the DC resistance of the dry-type reactor more accurate.

[0080] In one embodiment, anomaly detection of the inner wall temperature data and outer wall temperature data of the dry-type reactor includes: performing anomaly detection of the inner wall temperature data and outer wall temperature data of the dry-type reactor based on the detection temperature deviation range corresponding to the ambient temperature.

[0081] Specifically, the dry-type reactor DC resistance testing device has an adjustable internal test deviation range, which can be set to different ranges for the inner and outer wall temperatures of the dry-type reactor. Based on the received inner and outer wall temperature data, the arithmetic mean of the inner and outer wall temperatures is calculated. The deviation value is then calculated between each temperature data point and its corresponding arithmetic mean. If the deviation value exceeds the set internal test deviation range, the temperature data is considered abnormal and discarded. Furthermore, when the dry-type reactor DC resistance testing device eliminates abnormal values, it will display an error message on the device's screen to facilitate timely troubleshooting by operators.

[0082] In this embodiment, by setting internal detection deviation ranges for the inner wall temperature and outer wall temperature of the dry reactor respectively, the temperature differences in the actual measurement environment are fully considered, thus achieving the effect of accurately eliminating abnormal data.

[0083] In one embodiment, such as Figure 4 As shown, step 206 may include steps 402, 404 and 406.

[0084] Step 402: If the ambient temperature is lower than the average temperature of the dry-type reactor, then the temperature of the dry-type reactor and the ambient temperature reach a stable state of heat exchange.

[0085] Step 404: If the ambient temperature is greater than the average temperature of the dry-type reactor, and the difference between the ambient temperature and the average temperature of the dry-type reactor is within the set adjustable range, then the temperature of the dry-type reactor and the ambient temperature have not reached a stable state of heat exchange. Output a current of the set amplitude to the dry-type reactor and return to step 204.

[0086] Specifically, the dry-type reactor DC resistance testing device compares the ambient temperature and the average temperature of the dry-type reactor. When the ambient temperature is greater than the average temperature of the dry-type reactor, and the difference between the ambient temperature and the average temperature of the dry-type reactor is within the set adjustable range, the temperature of the dry-type reactor and the ambient temperature have not reached a stable state of heat exchange. The dry-type reactor DC resistance testing device needs to heat up the dry-type reactor by outputting a current of a set amplitude to the dry-type reactor to raise the temperature of the dry-type reactor to a stable state of heat exchange.

[0087] Furthermore, the adjustable range can be less than 5 degrees Celsius; the current for the set amplitude of the temperature rise can be 40A; under this condition of stable heat exchange, the dry-type reactor DC resistance test device needs to heat the dry-type reactor until the ambient temperature is lower than the average temperature of the dry-type reactor, and the difference between the ambient temperature and the average temperature of the dry-type reactor is equal to or greater than 2 degrees Celsius.

[0088] Step 406: If the ambient temperature is greater than the average temperature of the dry-type reactor, and the difference between the ambient temperature and the average temperature of the dry-type reactor is outside the set adjustable range, then the dry-type reactor temperature and the ambient temperature have not exchanged heat, and return to step 204.

[0089] Specifically, the dry-type reactor DC resistance testing device compares the ambient temperature with the average temperature of the dry-type reactor. When the ambient temperature is higher than the average temperature of the dry-type reactor, and the difference between the ambient temperature and the average temperature of the dry-type reactor is outside the adjustable range, it can be considered that the dry-type reactor temperature and the ambient temperature have not exchanged heat. In this case, the data obtained by heating the dry-type reactor using the DC resistance testing device will not be accurate enough, and the test conditions are not met. In this situation, the device waits for the temperature difference between the dry-type reactor and the ambient temperature to change until the test conditions are met before conducting the test.

[0090] In this embodiment, by adjusting the temperature of the dry-type reactor, the temperature of the dry-type reactor and the ambient temperature reach a stable state of heat exchange before the test begins. This ensures that the DC resistance test of the dry-type reactor is no longer affected by the ambient temperature under different meteorological conditions, thus solving the problem of the DC resistance test of the dry-type reactor being limited by meteorological conditions.

[0091] In one embodiment, step 209 involves evaluating the condition of the dry-type reactor based on the comparison results, including: determining that the dry-type reactor is normal when the deviation between the actual DC resistance value and the factory DC resistance is less than or equal to a set deviation value; and determining that the dry-type reactor is abnormal when the deviation between the actual DC resistance value and the factory DC resistance is greater than a set deviation value, and outputting a check prompt message.

[0092] Specifically, the dry-type reactor DC resistance testing device stores the factory DC resistance data input by the operator. When the device obtains the actual DC resistance value through calculation, it compares the actual DC resistance value with the factory DC resistance of the dry-type reactor, obtains the difference between the actual and factory DC resistance values, and divides the difference by the factory DC resistance to obtain the DC resistance deviation value. When the DC resistance deviation value is less than or equal to the set deviation value, the device determines that the DC resistance value of the dry-type reactor is normal, and the reactor is working normally. When the DC resistance deviation value is greater than the set deviation value, the device determines that the DC resistance value of the dry-type reactor is abnormal, and the reactor is malfunctioning, requiring inspection of the reactor leads. When the test result is abnormal, the device will output a detection prompt message.

[0093] Furthermore, the set deviation value can be 2% or other values, but is usually 1%. The dry-type reactor DC resistance test device outputs test prompt information. The way the test prompt information is output is not unique. It can be provided through at least one of the following: indicator lights, display screen and speaker. The prompting method includes, but is not limited to, one or more of the following: sound, light, graphics and text.

[0094] In one embodiment, such as Figure 5 As shown, when there are two or more dry-type reactors, step 209 is followed by steps 502, 504, 506, 508 and 509.

[0095] Step 502: Calculate the arithmetic average of the actual DC resistance values ​​obtained from this measurement of each dry-type reactor to obtain the average actual DC resistance.

[0096] Step 504: Calculate the arithmetic average of the factory DC resistance values ​​of each dry-type reactor to obtain the average factory DC resistance.

[0097] Step 506: Based on the actual average DC resistance and the factory average DC resistance, obtain the actual DC resistance variance and the factory DC resistance variance respectively.

[0098] The variance used is the sample variance. The actual DC resistance values ​​obtained from this measurement of each dry-type reactor are set as one sample data set, and the factory-set DC resistance values ​​of each dry-type reactor are set as another sample data set. The sample variance formula is applied as follows:

[0099]

[0100] Where: S represents the square of the standard deviation, i.e., the variance; X i X represents the i-th data value in a sample dataset;av N represents the arithmetic mean of all data in a sample data set; N represents the number of data points in a sample data set.

[0101] Step 508: Divide the actual DC resistance variance by the factory DC resistance variance to obtain the variance ratio.

[0102] Among them, the variance ratio is used for F-test, also known as variance ratio test. It is usually used to analyze statistical models that use more than one parameter to determine whether all or some of the parameters in the model are suitable.

[0103] Step 509: Compare the variance ratio with the variance ratio threshold corresponding to the set confidence level, and obtain the overall test error analysis of each dry reactor in this measurement based on the comparison results.

[0104] The confidence level is the confidence level for selecting the F-test, usually a percentage, which refers to the probability that the population parameter value falls within a certain range of the sample statistic. The variance ratio threshold corresponding to the set confidence level refers to the error range between the sample statistic and the population parameter value at a certain confidence level, which can be obtained by looking up a table.

[0105] Specifically, the variance ratio is compared with the variance ratio threshold corresponding to the set confidence level. If the variance ratio is large, it indicates that the overall test error of each dry-type reactor in this measurement is large, and the dry-type reactor DC resistance test device outputs a prompt message, prompting the test results of dry-type reactors with large deviations from the factory value to be retested. If the variance ratio is small, it indicates that the overall test error of each dry-type reactor in this measurement is small, and the overall test data has high reliability.

[0106] Furthermore, the confidence level can be set to 95%, at which point F can be obtained. 0.05(N-1,N-1) Values, compare variance ratios and F 0.05(N-1,N-1) If the variance ratio is large, it indicates that the overall test error of each dry-type reactor in this measurement is large, and the test results of the dry-type reactors with large deviations from the factory values ​​need to be retested; if the variance ratio is small, it indicates that the overall test error of each dry-type reactor in this measurement is small, and the overall test data is highly reliable.

[0107] In this embodiment, by analyzing the overall test error of each dry-type reactor in this measurement, it is determined whether the overall test result of this measurement is reliable, and the test results of dry-type reactors with large deviations can be identified, prompting for retesting, thereby improving the accuracy of the overall test result of this measurement.

[0108] In one embodiment, after step 209, the method further includes: calculating the difference between the actual DC resistance value obtained from the current measurement of the dry-type reactor and all previous actual DC resistance values, then calculating the standard deviation of the difference to obtain the detection value; comparing the detection value with the detection threshold corresponding to the set significance level, and evaluating and analyzing the operating status of the dry-type reactor based on the comparison result.

[0109] The test value is determined by a t-test, which uses the t-distribution theory to infer the probability of a difference occurring, thereby comparing whether the difference between two means is significant. Specifically, the standard deviation formula is:

[0110]

[0111] Wherein: S d d represents the standard deviation of all DC resistance measurements for a dry-type reactor. i This represents the i-th data value among all DC resistance measurement values ​​of the dry-type reactor; d 平均 This represents the average value of all DC resistance measurements of the dry-type reactor; n represents the number of data points among all DC resistance measurements of the dry-type reactor.

[0112] Calculate the test value from the obtained standard deviation:

[0113]

[0114] Where t represents the test value in the t-test.

[0115] The detected value is compared with the detection threshold corresponding to the set significance level, and the operating status of the dry reactor is evaluated and analyzed based on the comparison results.

[0116] The t-test includes a corresponding critical value table. By setting different significance levels and comparing them with the corresponding detection thresholds, the conclusions of the t-test can be obtained. Specifically, the detected value is compared with the detection threshold corresponding to the set significance level. If the detected value is small, it can be concluded that the dry-type reactor is operating well; if the detected value is large, it can be judged that the dry-type reactor is operating poorly, and the dry-type reactor DC resistance testing device will output a prompt message, suggesting that the dry-type reactor be inspected and tested more frequently.

[0117] Furthermore, the significance level can be set to 0.05, at which point t can be obtained. 4,0.05 =2.78, compare the detected value and t 4,0.05 =2.78. If the detected value is small, it can be concluded that the dry-type reactor is operating well; if the detected value is large, it can be judged that the dry-type reactor is not operating well, and it is necessary to strengthen the inspection and testing of the dry-type reactor.

[0118] In this embodiment, the actual DC resistance value obtained from the current measurement of the dry-type reactor is compared with all previous actual DC resistance values ​​to evaluate and analyze the operating status of the dry-type reactor, thus obtaining a conclusion on the operating status of the dry-type reactor, which helps to detect dry-type reactor faults in a timely manner.

[0119] This application achieves accurate testing of ambient temperature and dry-type reactor temperature by using a wireless thermocouple temperature sensor, a wireless communication unit, and an ambient temperature measurement unit attached to the inner and outer walls of the dry-type reactor. After analyzing and comparing the ambient temperature and the dry-type reactor temperature through the control board inside the dry-type reactor DC resistance testing device, it determines whether the tested dry-type reactor needs to be heated and achieves accurate measurement of the DC resistance value of the dry-type reactor. Then, through the processing and analysis of the test data by the control board inside the dry-type reactor DC resistance testing device, and combined with the factory DC resistance value and the tested DC resistance value of one or more dry-type reactors in this test, the overall test effect and the operating status of individual reactors can be evaluated separately.

[0120] This application improves the accuracy of DC resistance testing of dry-type reactors by using ambient temperature testing and a thermocouple sensor matrix on the inner and outer walls of the reactor body to accurately measure the temperature at various locations and calculate the average temperature of the dry-type reactor. By comparing the temperature difference between the ambient temperature and the average temperature of the dry-type reactor, it determines whether the reactor needs to be heated and selects the appropriate heating current, thus solving the problem of inaccurate temperature measurement in field tests. Through F-detection and t-detection analysis of previous test data of the dry-type reactors, and by analyzing the overall test error of each dry-type reactor in this measurement, the reliability of the overall test results is determined. By comparing the actual DC resistance value obtained in this measurement with all previous actual DC resistance values, the operating status of the dry-type reactor is evaluated and analyzed, leading to a conclusion on the operating status of the dry-type reactor.

[0121] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0122] Based on the same inventive concept, this application also provides a device for testing and assessing the DC resistance of a dry-type reactor to implement the aforementioned method for testing and assessing the condition of a dry-type reactor. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more embodiments of the device for testing and assessing the DC resistance of a dry-type reactor provided below can be found in the limitations of the method for testing and assessing the DC resistance of a dry-type reactor described above, and will not be repeated here.

[0123] In one embodiment, such as Figure 6 As shown, a device for testing and assessing the DC resistance of a dry-type reactor is provided, comprising: an ambient temperature measurement module 602, a dry-type reactor temperature measurement module 604, a temperature control module 606, a testing module 608, and an analysis module 609, wherein:

[0124] The ambient temperature measurement module 602 is used to obtain the ambient temperature of the dry-type reactor.

[0125] The dry-type reactor temperature measurement module 604 is used to acquire the collected dry-type reactor temperature and process the dry-type reactor temperature to obtain the average temperature of the dry-type reactor.

[0126] The temperature control module 606 is used to adjust the temperature of the dry reactor according to the ambient temperature and the average temperature of the dry reactor, so that the temperature of the dry reactor reaches a stable state of heat exchange with the ambient temperature.

[0127] Test module 608 is used to obtain the DC resistance value of the dry reactor when the temperature of the dry reactor reaches a stable state of heat exchange with the ambient temperature.

[0128] Analysis module 609 is used to convert the DC resistance value into the actual DC resistance value of the dry-type reactor at the factory temperature, compare the actual DC resistance value with the factory DC resistance value of the dry-type reactor, and perform a condition assessment of the dry-type reactor based on the comparison result.

[0129] In one embodiment, the dry-type reactor temperature measurement module 604 is used to acquire the inner wall temperature data of the dry-type reactor collected by the inner wall sensor; acquire the outer wall temperature data of the dry-type reactor collected by the outer wall sensor; perform abnormal data investigation on the inner wall temperature data and the outer wall temperature data of the dry-type reactor; and select the maximum and minimum values ​​from the inner wall temperature data and the outer wall temperature data of the dry-type reactor after abnormal data investigation to calculate the average value to obtain the average temperature of the dry-type reactor.

[0130] In one embodiment, when the dry-type reactor temperature measurement module 604 is used to check for abnormal data of the inner wall temperature data and the outer wall temperature data of the dry-type reactor, it is also used to check for abnormal data of the inner wall temperature data and the outer wall temperature data of the dry-type reactor according to the detection temperature deviation range corresponding to the ambient temperature.

[0131] In one embodiment, the temperature control module 606 is configured to: if the ambient temperature is lower than the average temperature of the dry-type reactor, then the temperature of the dry-type reactor and the ambient temperature reach a stable state of heat exchange; if the ambient temperature is higher than the average temperature of the dry-type reactor, and the difference between the ambient temperature and the average temperature of the dry-type reactor is within a set adjustable range, then the temperature of the dry-type reactor and the ambient temperature have not reached a stable state of heat exchange; output a current of a set amplitude to the dry-type reactor, return to obtain the collected dry-type reactor temperature, and process the dry-type reactor temperature to obtain the average temperature of the dry-type reactor; if the ambient temperature is higher than the average temperature of the dry-type reactor, and the difference between the ambient temperature and the average temperature of the dry-type reactor is outside the set adjustable range, then the temperature of the dry-type reactor and the ambient temperature have not exchanged heat, return to obtain the collected dry-type reactor temperature, and process the dry-type reactor temperature to obtain the average temperature of the dry-type reactor.

[0132] In one embodiment, the analysis module 609 is used to determine that the dry-type reactor is normal when the deviation between the actual DC resistance value and the factory DC resistance is less than or equal to the set deviation value; and to determine that the dry-type reactor is abnormal and output inspection prompt information when the deviation between the actual DC resistance value and the factory DC resistance is greater than the set deviation value.

[0133] In one embodiment, the number of dry-type reactors is two or more. The analysis module 609 is further used to calculate the arithmetic average of the actual DC resistance values ​​obtained from the current measurement of each dry-type reactor to obtain the actual DC resistance average value; calculate the arithmetic average of the factory DC resistance values ​​of each dry-type reactor to obtain the factory DC resistance average value; obtain the actual DC resistance variance and the factory DC resistance variance based on the actual DC resistance average value and the factory DC resistance average value, respectively; divide the actual DC resistance variance by the factory DC resistance variance to obtain the variance ratio; compare the variance ratio with the variance ratio threshold corresponding to the set confidence level, and obtain the overall test error analysis of each dry-type reactor in this measurement based on the comparison result.

[0134] In one embodiment, the analysis module 609 is further configured to calculate the difference between the actual DC resistance value obtained in this measurement of the dry-type reactor and all previous actual DC resistance values, and then calculate the standard deviation of the difference to obtain the detection value; compare the detection value with the detection threshold corresponding to the set significance level, and evaluate and analyze the operating status of the dry-type reactor based on the comparison result.

[0135] Each module in the aforementioned dry-type reactor DC resistance testing and condition assessment device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0136] In one embodiment, a dry-type reactor DC resistance testing and condition assessment system is provided, including a dry-type reactor DC resistance testing device and a temperature sensor. The dry-type reactor DC resistance testing device and the temperature sensor are wirelessly connected. The dry-type reactor DC resistance testing device is used to perform DC resistance testing and condition assessment on the dry-type reactor using the above method.

[0137] Specifically, a temperature sensor is installed on the dry-type reactor to measure its temperature, and the measured temperature is wirelessly transmitted to the dry-type reactor DC resistance testing device.

[0138] In one embodiment, such as Figure 7 As shown, the dry-type reactor DC resistance testing device includes a housing 710, a test port 720, a wireless communication unit 730, an ambient temperature measurement unit 740, an interactive device 750, and a control board. The control board is located inside the housing. The test port 720, the ambient temperature measurement unit 740, and the interactive device 750 are all located on the housing and connected to the control board. The wireless communication unit 730 communicates with the temperature sensor and is connected to the control board.

[0139] Specifically, the wireless communication unit 730 is divided into an inner wall communication unit 732 and an outer wall communication unit 734. Wireless communication can be achieved through WIFI, mobile cellular networks, NFC (Near Field Communication), or other technologies. It communicates with the temperature sensors located on the inner and outer walls, respectively. The dry-type reactor DC resistance testing device obtains the dry-type reactor temperature through the wireless communication unit 730. The ambient temperature measurement unit 740 on the outer casing 710 of the dry-type reactor DC resistance testing device can obtain the ambient temperature. The test ports 720 on the outer casing 710 of the dry-type reactor DC resistance testing device are a current output terminal 722, a voltage output terminal 724, a voltage input terminal 726, and a current input terminal 728. The test ports 720 are connected to the terminal block of the dry-type reactor. When there is an oxide layer or dirt on the terminal block, the voltage connection position can be changed, selecting the position with the lowest voltage according to the actual situation of the dry-type reactor. When the control board inside the dry-type reactor DC resistance testing device receives the temperature of the dry-type reactor and the ambient temperature, it calculates and compares the average temperature of the dry-type reactor with the ambient temperature. Based on the comparison result, the control board decides whether to output current to test port 720 and the magnitude of the output current. The control board acquires the actual test voltage and actual test current through test port 720 and performs calculations to obtain the DC resistance value of the dry-type reactor. The DC resistance value of the dry-type reactor can be used to analyze the error of the overall test work of each dry-type reactor, determine whether the overall test results are reliable, and identify dry-type reactors with large deviations; it can also be used to evaluate and analyze the operating status of the dry-type reactor, obtaining conclusions about its operating status. All the above test results can be displayed on the interactive device 750 of the dry-type reactor DC resistance testing device. The interactive device 750 includes a display screen 752 and function buttons 754. The display screen 752 is used to display information, and the function buttons 754 are used to adjust the displayed information, select functions, and recall data. For example, they can be used to select up, down, left, and right on the display page; set and adjust the instrument's built-in time, date, and test items; view, store, and delete saved data; and select the instrument's output current setting. In addition, the dry-type reactor DC resistance testing device is also equipped with a grounding port 760 to ensure the safety of the dry-type reactor DC resistance testing device and the testing personnel during testing.

[0140] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0141] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for testing the DC resistance and assessing the condition of a dry-type reactor, characterized in that, A DC resistance testing device for dry-type reactors is provided, wherein the DC resistance testing device is connected to the terminal block of the dry-type reactor via a wired connection; the method includes: The ambient temperature of the dry-type reactor is obtained; the ambient temperature is acquired by the ambient temperature measurement unit installed on the DC resistance testing device of the dry-type reactor. The collected dry-type reactor temperature is obtained, and the dry-type reactor temperature is processed to obtain the average temperature of the dry-type reactor. If the ambient temperature is greater than the average temperature of the dry-type reactor, and the difference between the ambient temperature and the average temperature of the dry-type reactor is within the set adjustable range, then the temperature of the dry-type reactor and the ambient temperature have not reached a stable state of heat exchange. A current of a set amplitude is output to the dry-type reactor to raise the temperature of the dry-type reactor. The process then returns to the step of acquiring the collected dry-type reactor temperature and processing the dry-type reactor temperature to obtain the average temperature of the dry-type reactor. If the ambient temperature is greater than the average temperature of the dry-type reactor, and the difference between the ambient temperature and the average temperature of the dry-type reactor is outside the set adjustable range, then the dry-type reactor temperature and the ambient temperature have not exchanged heat. The process returns to the step of acquiring the collected dry-type reactor temperature and processing the dry-type reactor temperature to obtain the average temperature of the dry-type reactor. If the ambient temperature is lower than the average temperature of the dry-type reactor, then the temperature of the dry-type reactor and the ambient temperature reach a stable state of heat exchange. Obtain the DC resistance value of the dry reactor when the temperature of the dry reactor reaches a stable state of heat exchange with the ambient temperature; The DC resistance value is converted into the actual DC resistance value of the dry-type reactor at the factory temperature. The actual DC resistance value is compared with the factory DC resistance value of the dry-type reactor. The condition of the dry-type reactor is evaluated based on the comparison result.

2. The method according to claim 1, characterized in that, The process of acquiring the collected dry-type reactor temperature and processing the dry-type reactor temperature to obtain the average temperature of the dry-type reactor includes: Acquire the internal wall temperature data of the dry reactor from the internal wall sensor; Acquire the temperature data of the outer wall of the dry reactor from the sensors on the outer wall of the dry reactor; Anomaly detection was performed on the inner wall temperature data and outer wall temperature data of the dry-type reactor. After checking for abnormal data, the maximum and minimum values ​​of the inner and outer wall temperature data of the dry-type reactor are selected and averaged to obtain the average temperature of the dry-type reactor.

3. The method according to claim 2, characterized in that, The abnormal data investigation of the inner wall temperature data and the outer wall temperature data of the dry-type reactor includes: Based on the temperature deviation range corresponding to the ambient temperature, abnormal data are investigated for the inner wall temperature data and the outer wall temperature data of the dry reactor.

4. The method according to claim 1, characterized in that, The condition assessment of the dry-type reactor based on the comparison results includes: When the deviation between the actual DC resistance value and the factory DC resistance value is less than or equal to the set deviation value, the dry-type reactor is judged to be normal. When the deviation between the actual DC resistance value and the factory DC resistance value is greater than the set deviation value, the dry-type reactor is judged to be abnormal, and an inspection prompt message is output.

5. The method according to claim 1, characterized in that, The number of dry-type reactors is two or more. After converting the DC resistance value to the actual DC resistance value of the dry-type reactor at the factory temperature, comparing the actual DC resistance value with the factory DC resistance value of the dry-type reactor, and performing a condition assessment of the dry-type reactor based on the comparison result, the process further includes: The arithmetic average of the actual DC resistance values ​​obtained from the measurement of each dry-type reactor is calculated to obtain the average actual DC resistance. The arithmetic average of the factory DC resistance values ​​of each dry-type reactor is calculated to obtain the average factory DC resistance. Based on the actual average DC resistance and the factory average DC resistance, the variance of the actual DC resistance and the variance of the factory DC resistance are obtained respectively. Divide the actual DC resistance variance by the factory DC resistance variance to obtain the variance ratio. The variance ratio is compared with the variance ratio threshold corresponding to the set confidence level, and the overall test error analysis of each dry reactor in this measurement is obtained based on the comparison results.

6. The method according to claim 1, characterized in that, The process of converting the DC resistance value into the actual DC resistance value of the dry-type reactor at the factory temperature, comparing the actual DC resistance value with the factory DC resistance value of the dry-type reactor, and performing a condition assessment of the dry-type reactor based on the comparison result, further includes: The actual DC resistance value obtained from this measurement of the dry-type reactor is compared with all previous actual DC resistance values. Then, the standard deviation of the difference is calculated to obtain the test value. The detected value is compared with the detection threshold corresponding to the set significance level, and the operating status of the dry reactor is evaluated and analyzed based on the comparison result.

7. A device for testing and assessing the DC resistance and condition of a dry-type reactor, characterized in that, The device includes: An ambient temperature measurement module is used to acquire the ambient temperature of the dry-type reactor; the ambient temperature is acquired by an ambient temperature measurement unit installed on the dry-type reactor DC resistance testing device; the dry-type reactor DC resistance testing device is connected to the terminal block of the dry-type reactor via a wired connection. The dry-type reactor temperature measurement module is used to acquire the collected dry-type reactor temperature and process the dry-type reactor temperature to obtain the average temperature of the dry-type reactor. The temperature control module, if the ambient temperature is higher than the average temperature of the dry-type reactor, and the difference between the ambient temperature and the average temperature of the dry-type reactor is within a set adjustable range, then the dry-type reactor temperature and the ambient temperature have not reached a stable heat exchange state. The module outputs a current of a set amplitude to the dry-type reactor to raise its temperature, and then returns to the step of acquiring and processing the collected dry-type reactor temperature to obtain the average temperature of the dry-type reactor. If the ambient temperature is higher than the average temperature of the dry-type reactor, and the difference between the ambient temperature and the average temperature of the dry-type reactor is outside the set adjustable range, then the dry-type reactor temperature and the ambient temperature have not exchanged heat, and the module returns to the step of acquiring and processing the collected dry-type reactor temperature to obtain the average temperature of the dry-type reactor. If the ambient temperature is lower than the average temperature of the dry-type reactor, then the dry-type reactor temperature and the ambient temperature have reached a stable heat exchange state. The test module is used to obtain the DC resistance value of the dry reactor when the temperature of the dry reactor reaches a stable state of heat exchange with the ambient temperature. The analysis module is used to convert the DC resistance value into the actual DC resistance value of the dry-type reactor at the factory temperature, compare the actual DC resistance value with the factory DC resistance value of the dry-type reactor, and perform a condition assessment of the dry-type reactor based on the comparison result.

8. A system for testing and assessing the DC resistance of a dry-type reactor, characterized in that, The system includes a dry-type reactor DC resistance testing device and a temperature sensor. The dry-type reactor DC resistance testing device and the temperature sensor are wirelessly connected. An ambient temperature measurement unit is provided on the dry-type reactor DC resistance testing device. The ambient temperature measurement unit is used to collect the ambient temperature of the environment where the dry reactor is located. The dry-type reactor DC resistance testing device is used to perform DC resistance testing and condition assessment on the dry-type reactor according to the method described in any one of claims 1-6.

9. The system according to claim 8, characterized in that, The dry-type reactor DC resistance testing device includes a housing, a test port, a wireless communication unit, an interaction device, and a control board. The control board is disposed inside the housing. The test port, the ambient temperature measurement unit, and the interaction device are all disposed on the housing and connected to the control board. The wireless communication unit communicates with the temperature sensor and is connected to the control board.

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