Comprehensive analysis method and device for dissolved gas in transformer oil and storage medium

Abstract

The invention relates to the technical field of gas detection, and particularly discloses a comprehensive analysis method and device for dissolved gas in transformer oil and a storage medium, and the method comprises the following steps: sampling the transformer oil according to a fixed time interval, pre-treating the sample, and sending the sample for detection; the content of the dissolved gas in the oil at different time points is corrected by combining the collected data, the original data of the content of the dissolved gas can be obtained, then the fluctuation value of the original data of the content of the dissolved gas in historical detection is obtained through calculation, and whether the detection precision of the dissolved gas detector is abnormal or not can be judged. Therefore, it is guaranteed that when the gas content threshold value is compared with the preset gas content threshold value subsequently, accurate data is obtained through detection in a good state based on the dissolved gas detector. According to the invention, the problem of inaccurate fault monitoring result caused by abnormal operation of the dissolved gas detector during detection in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and in particular to a method, a device and a storage medium for comprehensive analysis of dissolved gas in transformer oil. Background Art

[0002] Transformers are crucial equipment in power systems. Their internal state directly affects the stability and security of the power grid. In order to ensure the safe and stable operation of the power system, it is usually necessary to detect the dissolved gas content in the transformer oil to realize transformer fault monitoring.

[0003] The analysis method of dissolved gas in transformer oil is a complex process. The traditional analysis method of dissolved gas in transformer oil generally involves first sampling the transformer oil, then using a dissolved gas detector to detect the gas content using gas chromatography, and comparing the detected gas concentration value with the preset attention value. Finally, based on the comparison results, it is determined whether there is any abnormality in the transformer, thereby providing a strong guarantee for the safe operation of the transformer.

[0004] The traditional method for analyzing dissolved gases in transformer oil is generally to detect the gas content using a dissolved gas detector using gas chromatography. During this process, the accuracy of the test results will be affected by the status of the dissolved gas detector. If the dissolved gas detector has an abnormal operating status during the test, the accuracy of the test results will be reduced, thereby affecting the accuracy of the subsequent transformer fault monitoring results. Summary of the Invention

[0005] The purpose of the present invention is to provide a method, device and storage medium for comprehensive analysis of dissolved gases in transformer oil to solve the following technical problems:

[0006] How to improve the accuracy of transformer fault monitoring results.

[0007] The present invention can solve the problem in the prior art that the fault monitoring result is inaccurate due to abnormal operation of the dissolved gas detector during detection.

[0008] An embodiment of the present invention provides a method for comprehensive analysis of dissolved gases in transformer oil, the method comprising:

[0009] S1: The transformer oil is sampled at fixed time intervals through the sampling module, and the sampled samples are pre-processed to generate the oil samples to be tested at each sampling time point;

[0010] S2: The oil samples to be tested at different sampling time points are tested by a dissolved gas detector based on the online chromatographic original spectrum method to generate the dissolved gas content in the oil at each sampling time point;

[0011] S3: collecting the transformer operating status data and mineral insulating oil status data at each sampling time point through the data acquisition module;

[0012] S4: The data calculation module corrects the dissolved gas content in the oil at each sampling time point based on the transformer operating status data and the mineral insulating oil status data collected by the data acquisition module, thereby generating raw data of the dissolved gas content at each sampling time point;

[0013] S5: The data analysis module calculates the fluctuation value of the raw data of the dissolved gas content at each sampling time point to generate a corresponding fluctuation value. The corresponding fluctuation value is used to determine whether there is an abnormality in the detection accuracy of the dissolved gas detector. If not, jump to step S6. If yes, after replacing the dissolved gas detector, jump to step S1.

[0014] S6: The dissolved gas content in the oil at each sampling time point detected by the dissolved gas detector is compared with a preset gas content threshold value through the data evaluation module, and whether there is a fault inside the transformer is determined based on the comparison result.

[0015] Furthermore, the dissolved gas content in the oil at each sampling time point is corrected based on the transformer operating status data and the mineral insulating oil status data collected by the data acquisition module to generate the original data of the dissolved gas content at each sampling time point, including:

[0016] S41: Calculating an error correction coefficient of the dissolved gas content in the oil at each sampling time point based on the operating status data of the transformer and the status data of the mineral insulating oil;

[0017] S42: Correcting the dissolved gas content in the oil at each sampling time point according to the error correction coefficient to generate original data of the dissolved gas content at each sampling time point.

[0018] Furthermore, the operating status data of the transformer includes transformer operating temperature, load and number of arc discharges;

[0019] The state data of the mineral insulating oil includes the oil pressure of the mineral insulating oil.

[0020] Furthermore, the error correction coefficient of the dissolved gas content in oil at each sampling time point is calculated using the following formula:

[0021]

[0022] Among them, μ i is the error correction coefficient of the dissolved gas detector at the time of the i-th detection, i is any detection time point of the dissolved gas detector, fh iis the transformer load during the i-th detection of the dissolved gas detector, fh y is the preset load, wd i is the transformer operating temperature during the i-th detection by the dissolved gas detector, wd y is the preset operating temperature threshold, wd b wd i The standard value of p i The total number of arc discharges during the i-th detection of the dissolved gas detector, p y is the preset number of arc discharges, c is any arc discharge, qd c is the discharge intensity of the cth arc discharge, yl i is the oil pressure of the dissolved gas detector during the i-th detection, yl y is the preset oil pressure threshold, yl b For yl i The standard value of f m To define a function, if f m (x)≥x, then let f m =x, otherwise, let f m =1, x1 and x2 are weight coefficients.

[0023] Furthermore, the dissolved gas content in the oil at each sampling time point is corrected using the following formula to generate the raw data of the dissolved gas content at each sampling time point:

[0024]

[0025] Among them, δ i is the original data of dissolved gas content during the i-th detection by the dissolved gas detector, qit i is the dissolved gas content in oil obtained by the dissolved gas detector during the i-th detection, ω is the error influence coefficient, and f w is an adjustment coefficient comparison table function, wherein the adjustment coefficient comparison table function f w The value of μ i *The values ​​of ω correspond one to one.

[0026] Furthermore, the data analysis module calculates the fluctuation value of the original data of the dissolved gas content at each sampling time point using the following formula to generate the corresponding fluctuation value:

[0027]

[0028] Among them, γ i is the fluctuation value of the original data of all dissolved gas contents from the beginning of the detection to the i-th detection of the dissolved gas detector, t i is the total number of detections of the dissolved gas detector from the start of detection to the i-th detection, For all δ i The average value of For all δ i The maximum value in For all δ i The minimum value in , g is the proportional coefficient.

[0029] Furthermore, judging whether there is an abnormality in the detection accuracy of the dissolved gas detector according to the corresponding fluctuation value, if not, jumping to step S6, if yes, replacing the dissolved gas detector and retesting, jumping to step S1, including:

[0030] The fluctuation value γ of the original data of all dissolved gas content from the beginning of the dissolved gas detector to the i-th detection i and the preset fluctuation value threshold γ 01 Make a comparison;

[0031] If γ i ≥γ 01 , judging that the detection accuracy of the dissolved gas detector is abnormal; sending an alarm signal for replacing the dissolved gas detector, and after replacing the dissolved gas detector, jumping to step S1;

[0032] If γ i <γ 01 , determine that there is no abnormality in the detection accuracy of the dissolved gas detector; jump to step S6.

[0033] Furthermore, the dissolved gas content in the oil at each sampling time point detected by the dissolved gas detector is compared with a preset gas content threshold, and whether there is a fault inside the transformer is determined based on the comparison result, including:

[0034] Compare the dissolved gas content qit in the oil obtained by the dissolved gas detector during the i-th detection with the preset gas content threshold interval [β1, β2];

[0035] If qit i ∈[β1, β2], it is judged that there is no fault inside the transformer at this time point;

[0036] like It is determined that there is a fault inside the transformer at this time point.

[0037] Based on the above method embodiments, the present invention provides corresponding device embodiments.

[0038] An embodiment of the present invention provides a device for comprehensive analysis of dissolved gases in transformer oil, the device comprising:

[0039] The sample sampling module is used to sample transformer oil at fixed time intervals and pre-process the sampled samples to generate the oil samples to be tested at each sampling time point;

[0040] Dissolved gas detector, used to detect the oil samples at different time points based on the online chromatographic original spectrum method, and generate the dissolved gas content in the oil at each sampling time point;

[0041] A data acquisition module is used to collect the operating status data of the transformer and the status data of the mineral insulating oil at each sampling time point;

[0042] A data calculation module is used to correct the dissolved gas content in the oil at each sampling time point based on the transformer operating status data and mineral insulating oil status data collected by the data acquisition module, and generate raw data of the dissolved gas content at each sampling time point;

[0043] The data analysis module is used to calculate the fluctuation value of the raw data of the dissolved gas content at each sampling time point and generate the corresponding fluctuation value; based on the corresponding fluctuation value, it is judged whether there is an abnormality in the detection accuracy of the dissolved gas detector; if not, the data evaluation module is called; if so, the sample sampling module is called again after the dissolved gas detector is replaced;

[0044] The data evaluation module compares the dissolved gas content in the oil at each sampling time point detected by the dissolved gas detector with the preset gas content threshold, and determines whether there is a fault inside the transformer based on the comparison results.

[0045] Based on the above method embodiment, the present invention provides a corresponding storage medium embodiment.

[0046] An embodiment of the present invention provides a storage medium storing a comprehensive analysis program for dissolved gas in oil. When the comprehensive analysis program for dissolved gas in oil is executed by a processor, steps of a comprehensive analysis method for dissolved gas in transformer oil are implemented.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] (1) The present invention corrects the dissolved gas content in oil at different time points by combining the data collected by the data acquisition module, and obtains the original data of the dissolved gas content. The data can reflect the original gas content of the dissolved gas content in the oil after excluding external environmental factors. Then, the fluctuation value of the original data of the dissolved gas content in the historical detection is obtained by calculation, and a judgment can be made on whether there is an abnormality in the detection accuracy of the dissolved gas detector, thereby ensuring that the subsequent comparison with the preset gas content threshold is based on accurate data obtained by the dissolved gas detector in a good state, thereby improving the accuracy of the transformer fault monitoring results.

[0049] (2) The present invention calculates the fluctuation value γ of the original data of all dissolved gas contents from the start of detection to the i-th detection by the dissolved gas detector. i and the preset fluctuation value threshold γ 01 Through this comparison method, it is possible to judge whether there is any abnormality in the detection accuracy of the dissolved gas detector based on the size of the gap between the original data of all dissolved gas contents, thereby ensuring that the subsequent comparison with the preset gas content threshold is based on accurate data obtained by the dissolved gas detector in good condition, thereby improving the accuracy of the transformer fault monitoring results.

[0050] (3) The present invention calculates the dissolved gas content in the oil obtained by the dissolved gas detector at the i-th detection. i By comparing it with the preset gas content threshold interval [β1, β2], the content of dissolved gas in the oil at that point in time can be judged, thereby avoiding the situation where the transformer fails due to the content of dissolved gas in the oil being too high or too low. Moreover, since this comparison method is based on the analysis of the data detected by the dissolved gas detector with high accuracy, the accuracy of the analysis results can be guaranteed.

[0051] (4) The present invention collects the operating status data of the transformer and the status data of the mineral insulating oil by combining the data acquisition module, and then corrects the dissolved gas content in the oil during each detection in combination with the data, so as to obtain the original data of the dissolved gas content in the oil before being affected by the operating status data of the transformer and the status data of the mineral insulating oil. Then, by analyzing the fluctuation values ​​of all the original data in the historical process, it can be determined whether the dissolved gas detector has any abnormal operation in the historical operation, thereby ensuring that the subsequent judgment of whether there is a fault inside the transformer is based on data with higher accuracy, thereby improving the accuracy of the judgment result. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The present invention will be further described below with reference to the accompanying drawings.

[0053] Figure 1 This is a flow chart of a comprehensive analysis method for dissolved gases in transformer oil according to the present invention;

[0054] Figure 2 It is a structural schematic diagram of the comprehensive analysis device for dissolved gas in oil of the present invention. DETAILED DESCRIPTION

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0056] See also Figure 1 As shown, in order to solve the problem in the prior art of inaccurate fault monitoring results caused by abnormal operation of the dissolved gas detector during detection, in one embodiment, the present application provides a method, device and storage medium for comprehensive analysis of dissolved gas in transformer oil, the method comprising:

[0057] S1: The transformer oil is sampled at fixed time intervals through the sampling module, and the sampled samples are pre-processed to generate the oil samples to be tested at each sampling time point;

[0058] S2: The oil samples to be tested at different sampling time points are tested by a dissolved gas detector based on the online chromatographic original spectrum method to generate the dissolved gas content in the oil at each sampling time point;

[0059] S3: collecting the transformer operating status data and mineral insulating oil status data at each sampling time point through the data acquisition module;

[0060] S4: The data calculation module corrects the dissolved gas content in the oil at each sampling time point based on the transformer operating status data and the mineral insulating oil status data collected by the data acquisition module, thereby generating raw data of the dissolved gas content at each sampling time point;

[0061] S5: Calculate the fluctuation value of the raw data of the dissolved gas content at each sampling time point through the data analysis module to generate a corresponding fluctuation value; determine whether there is an abnormality in the detection accuracy of the dissolved gas detector based on the corresponding fluctuation value. If not, jump to step S6; if yes, jump to step S1 after replacing the dissolved gas detector;

[0062] S6: The dissolved gas content in the oil at each sampling time point detected by the dissolved gas detector is compared with a preset gas content threshold value through the data evaluation module, and whether there is a fault inside the transformer is determined based on the comparison result.

[0063] Through the above technical solution, this example provides a comprehensive analysis method for dissolved gas in transformer oil. First, the transformer oil is sampled at fixed time intervals through a sample sampling module, and the samples are pre-processed and sent for detection. Then, the dissolved gas content in the oil at different sampling time points is detected by a dissolved gas detector based on an online chromatographic original spectrum method. The operating status data of the transformer and the status data of the mineral insulating oil are collected through a data acquisition module. Subsequently, the operating status data of the transformer and the status data of the mineral insulating oil collected by the data acquisition module can be combined through a data calculation module to correct the dissolved gas content in the oil at each sampling time point to generate raw data of the dissolved gas content.

[0064] Finally, the data analysis module calculates the fluctuation value of the original data of the dissolved gas content at each sampling time point to generate a corresponding fluctuation value; based on the corresponding fluctuation value, a judgment is made as to whether there is an abnormality in the detection accuracy of the dissolved gas detector. When it is judged that the detection accuracy of the dissolved gas detector is abnormal, the dissolved gas detector is replaced and retested; otherwise, the dissolved gas content in the oil detected by the dissolved gas detector at each sampling time point can be compared with the preset gas content threshold value through the data evaluation module, and based on the comparison result, it is judged whether there is a fault inside the transformer;

[0065] Through such a setting, this example corrects the dissolved gas content in the oil at different sampling time points by combining the data collected by the data acquisition module, and can obtain the original data of the dissolved gas content. This data can reflect the original gas content of the dissolved gas content in the oil after excluding external environmental factors. Then, by calculating the fluctuation value of the original data of the dissolved gas content at each sampling time point, it is possible to judge whether there is an abnormality in the detection accuracy of the dissolved gas detector, thereby ensuring that the subsequent comparison with the preset gas content threshold is based on accurate data obtained by the dissolved gas detector in a good state, thereby improving the accuracy of the transformer fault monitoring results.

[0066] Specifically, the method of correcting the dissolved gas content in the oil at each sampling time point based on the transformer operating status data and the mineral insulating oil status data collected by the data acquisition module to generate the original data of the dissolved gas content at each sampling time point includes:

[0067] S41: Calculate the error correction coefficient of the dissolved gas content in the oil at each sampling time point based on the transformer operating status data and the mineral insulating oil status data:

[0068] S42: Correcting the dissolved gas content in the oil at each sampling time point according to the error correction coefficient to generate original data of the dissolved gas content at each sampling time point.

[0069] Through the above technical solution, this example provides a correction process in S4. First, the data calculation module combines the operating status data of the transformer and the status data of the mineral insulating oil to calculate the error correction coefficient of the dissolved gas content in the oil at each sampling time point. Then, the dissolved gas content in the oil obtained by each detection of the dissolved gas detector can be corrected by combining the error correction coefficient at each detection of the dissolved gas detector. Through such a setting, since the operating status data of the transformer and the status data of the mineral insulating oil are the main factors affecting the dissolved gas content in the oil, after the dissolved gas content data in the oil obtained by each detection of the dissolved gas detector is corrected in combination with the data, the status of the dissolved gas detector can be analyzed according to the size fluctuation of the original data of the dissolved gas content at each sampling time point, thereby improving the accuracy of the analysis results.

[0070] Specifically, the data collected by the data collection module in S3 includes:

[0071] The operating status data of the transformer, including transformer operating temperature, load and number of arc discharges;

[0072] The state data of the mineral insulating oil includes the oil pressure of the mineral insulating oil.

[0073] Through the above technical solution, this example provides data collected by the data acquisition module in S3, including transformer operating status data such as transformer operating temperature, load and arc discharge number and oil pressure data of mineral insulating oil. By combining this data, the dissolved gas content in the oil at each sampling time point can be corrected to obtain the original data of the dissolved gas content in the oil before it is affected by factors such as transformer operating temperature, load, arc discharge number and oil pressure data of mineral insulating oil. Since the transformer operating temperature, load, arc discharge number and oil pressure data of mineral insulating oil are the main factors affecting the dissolved gas content in the oil, the difference between the original data of all detections at each sampling time point is small, that is, the difference fluctuation value of the original data of all detections at each sampling time point is small. On this basis, when the difference fluctuation value of the original data of all detections at each sampling time point is large, it means that there is a problem with the accuracy of the dissolved gas detector, resulting in errors in the detection results of each detection at each sampling time point.

[0074] By setting it in this way, it can be ensured that the subsequent comparison with the preset gas content threshold is based on accurate data obtained by the dissolved gas detector under good conditions, thereby improving the accuracy of the transformer fault monitoring results.

[0075] Specifically, the error correction coefficient of the dissolved gas content in oil at each sampling time point is calculated using the following formula:

[0076]

[0077] Among them, μ i is the error correction coefficient of the dissolved gas detector at the time of the i-th detection, i is any detection time point of the dissolved gas detector, fh i is the transformer load during the i-th detection of the dissolved gas detector, fh y is the preset load, wd i is the transformer operating temperature during the i-th detection by the dissolved gas detector, wd y is the preset operating temperature threshold, wd b wd i The above standard values ​​can be set based on the allowable error in the empirical data and used to m (wd i -wd y ) is dedimensionalized, p i The total number of arc discharges during the i-th detection of the dissolved gas detector, p y is the preset number of arc discharges, c is any arc discharge, qd c is the discharge intensity of the cth arc discharge, yl is the oil pressure of the dissolved gas detector during the i-th detection, yl y is the preset oil pressure threshold, yl b For yl i The above standard values ​​can be set based on the allowable error in the empirical data and used to m (yl y -yl i ) is dedimensionalized, f m To define a function, if f m (x)≥x, then let f m =x, otherwise, let f m =1, x1 and x2 are weight coefficients, set according to empirical fitting;

[0078] Through the above technical solution, this example provides the error correction coefficient of the dissolved gas detector during the i-th detection, which can be obtained by the formula It is calculated that, obviously, the lower the transformer load and oil pressure during the i-th detection of the dissolved gas detector, the higher the transformer operating temperature and the more the total number of arc discharges during the i-th detection of the dissolved gas detector, the higher the error correction coefficient of the dissolved gas detector during the i-th detection, indicating that the dissolved gas content in the oil was greatly affected during this detection. Conversely, the higher the transformer load and oil pressure during the i-th detection of the dissolved gas detector, the lower the transformer operating temperature and the fewer the total number of arc discharges during the i-th detection of the dissolved gas detector, the smaller the error correction coefficient of the dissolved gas detector during the i-th detection, indicating that the dissolved gas content in the oil was less affected during this detection. Through this calculation method, the degree of external influence on the dissolved gas content in the oil during each detection process can be analyzed, thereby providing accurate data support for the subsequent correction of the dissolved gas content in the oil.

[0079] Preferably, the dissolved gas content in the oil at each sampling time point is corrected by the following formula to generate the original data of the dissolved gas content at each sampling time point:

[0080]

[0081] Among them, δ i is the original data of dissolved gas content during the i-th detection by the dissolved gas detector, qit i is the dissolved gas content in oil obtained by the dissolved gas detector during the i-th detection, ω is the error influence coefficient, which is set according to empirical fitting, and f w is an adjustment coefficient comparison table function, wherein the adjustment coefficient comparison table function f w The value of μ i *The values ​​of ω correspond one to one. Specifically, f w The value of μ can be determined based on the empirical data. i *The influence of the range of ω values ​​on the raw data of dissolved gas content during the i-th test of the dissolved gas detector is based on a large amount of test data;

[0082] Through the above technical solution, this example provides the original data δ of the dissolved gas content during the i-th detection of the dissolved gas detector. i , can be obtained by formula It is calculated that by correcting the dissolved gas content in the oil obtained by the dissolved gas detector at the i-th detection in combination with the error correction coefficient of the dissolved gas detector at the i-th detection, the original data of the dissolved gas content in the oil before being affected by factors such as the transformer operating temperature, load, number of arc discharges, and oil pressure data of the mineral insulating oil can be obtained. Since the transformer operating temperature, load, number of arc discharges, and oil pressure data of the mineral insulating oil are the main factors affecting the dissolved gas content in the oil, after calculating the original data of the dissolved gas content at the i-th detection of the dissolved gas detector, the status of the dissolved gas detector can be analyzed according to the fluctuation of the original data of the dissolved gas content at each detection.

[0083] Optionally, the data analysis module calculates the fluctuation value of the original data of the dissolved gas content at each sampling time point using the following formula to generate a corresponding fluctuation value:

[0084]

[0085] Among them, γ i is the fluctuation value of the original data of all dissolved gas contents from the beginning of the detection to the i-th detection of the dissolved gas detector, t i is the total number of detections of the dissolved gas detector from the start of detection to the i-th detection, For all δ i The average value of For all δ i The maximum value in For all δ i The minimum value in , g is the proportional coefficient, which is set according to empirical fitting;

[0086] Through the above technical solution, this example provides the fluctuation value γ of the raw data of all dissolved gas content from the start of detection to the i-th detection of the dissolved gas detector. i , can be obtained by formula It is calculated that since the dissolved gas content in the oil will be affected by external environmental factors, the dissolved gas content in the oil is corrected by combining the operating status data of the transformer and the status data of the mineral insulating oil. The similarity of the original data of the dissolved gas content at each sampling time point is high. On this basis, if the fluctuation value is larger, that is, the difference between the original data of all dissolved gas contents at each sampling time point is larger, it means that there is a problem with the detection accuracy of the dissolved gas detector, resulting in an error in the dissolved gas content in the oil at each detection. Conversely, when the fluctuation value is smaller, that is, the difference between the original data of all dissolved gas contents at each sampling time point is smaller, it means that there is no problem with the detection accuracy of the dissolved gas detector, and there is no error in the dissolved gas content in the oil at each detection.

[0087] Through such a setting, it is possible to judge whether there is a problem with the detection accuracy of the dissolved gas detector based on the fluctuation value of the original data of all dissolved gas contents from the start of detection to the i-th detection, thereby ensuring that when the dissolved gas detector is subsequently compared with the preset gas content threshold, it is based on accurate data obtained by the dissolved gas detector when it is detected in a good state, thereby improving the accuracy of the transformer fault monitoring results.

[0088] In a specific implementation, the method judges whether there is an abnormality in the detection accuracy of the dissolved gas detector according to the corresponding fluctuation value. If not, jump to step S6. If yes, after replacing the dissolved gas detector, jump to step S1, including:

[0089] The fluctuation value γ of the original data of all dissolved gas content from the beginning of the dissolved gas detector to the i-th detection i and the preset fluctuation value threshold γ 01 Make a comparison;

[0090] If γ i ≥γ 01 , judging that the detection accuracy of the dissolved gas detector is abnormal; sending an alarm signal for replacing the dissolved gas detector, and after replacing the dissolved gas detector, jumping to step S1;

[0091] If γ i <γ 01 , determine that there is no abnormality in the detection accuracy of the dissolved gas detector; jump to step S6.

[0092] Through the above technical solution, the fluctuation value γ of the original data of all dissolved gas content from the start of detection to the i-th detection of the dissolved gas detector is calculated. i and the preset fluctuation value threshold γ 01 By comparing, the difference between the original data of all dissolved gas contents from the beginning of the test to the i-th test of the dissolved gas detector can be analyzed;

[0093] Since the transformer operating temperature, load, number of arc discharges and oil pressure data of mineral insulating oil are the main factors affecting the dissolved gas content in the oil, after the original data of the dissolved gas content is obtained based on the correction of the data, if the operating status of the dissolved gas detector is good, then the original data of all dissolved gas contents in one detection process should be largely similar. On this basis, by analyzing the gap between the original data of all dissolved gas contents from the start of the dissolved gas detector to the i-th detection, the status of the dissolved gas detector can be analyzed, thereby ensuring that the subsequent comparison with the preset gas content threshold is based on accurate data obtained by the dissolved gas detector when it is detected in a good state, thereby improving the accuracy of the transformer fault monitoring results.

[0094] In addition, when it is judged that there is an abnormality in the detection accuracy of the dissolved gas detector, it means that the accuracy of the data detected by the dissolved gas detector is low, and the dissolved gas detector needs to be replaced and retested; when it is judged that there is no abnormality in the detection accuracy of the dissolved gas detector, it means that the accuracy of the data detected by the dissolved gas detector is high.

[0095] Through the above technical solution, this example combines the fluctuation value γ of the original data of all dissolved gas content from the start of detection to the i-th detection of the dissolved gas detector with the preset fluctuation value threshold γ 01 Through this comparison method, it is possible to judge whether there is any abnormality in the detection accuracy of the dissolved gas detector based on the size of the gap between the original data of all dissolved gas contents, thereby ensuring that the subsequent comparison with the preset gas content threshold is based on accurate data obtained by the dissolved gas detector in good condition, thereby improving the accuracy of the transformer fault monitoring results.

[0096] Preferably, the dissolved gas content in the oil at each sampling time point detected by the dissolved gas detector is compared with a preset gas content threshold, and whether there is a fault inside the transformer is determined based on the comparison result, including:

[0097] The dissolved gas content in oil obtained by the dissolved gas detector at the i-th test is qit i Compare with the preset gas content threshold interval [β1, β2];

[0098] If qit i ∈[β1, β2], it is judged that there is no fault inside the transformer at this time point;

[0099] like It is determined that there is a fault inside the transformer at this time point.

[0100] Through the above technical solution, this example calculates the dissolved gas content in oil obtained by the dissolved gas detector during the i-th detection.i By comparing it with the preset gas content threshold interval [β1, β2], the content of dissolved gas in the oil at that point in time can be judged, thereby avoiding the situation where the transformer fails due to the content of dissolved gas in the oil being too high or too low. Moreover, since this comparison method is based on the analysis of the data detected by the dissolved gas detector with high accuracy, the accuracy of the analysis results can be guaranteed.

[0101] See also Figure 2 As shown, a comprehensive analysis device for dissolved gases in transformer oil, the device comprising:

[0102] The sample sampling module is used to sample transformer oil at fixed time intervals, pre-process the samples, and generate oil samples to be tested at each sampling time point;

[0103] Dissolved gas detector, used to check the oil samples to be tested at different sampling time points based on the online chromatographic original spectrum method, and generate the dissolved gas content in the oil at each sampling time point;

[0104] A data acquisition module is used to collect the operating status data of the transformer and the status data of the mineral insulating oil at each sampling time point;

[0105] A data calculation module is used to correct the dissolved gas content in the oil at each sampling time point based on the transformer operating status data and mineral insulating oil status data collected by the data acquisition module, and generate raw data of the dissolved gas content at each sampling time point;

[0106] The data analysis module is used to calculate the fluctuation value of the raw data of the dissolved gas content at each sampling time point and generate the corresponding fluctuation value; based on the corresponding fluctuation value, it is judged whether there is an abnormality in the detection accuracy of the dissolved gas detector; if not, the data evaluation module is called; if so, the sample sampling module is called again after the dissolved gas detector is replaced;

[0107] The data evaluation module is used to compare the dissolved gas content in the oil at each sampling time point detected by the dissolved gas detector with the preset gas content threshold, and determine whether there is a fault inside the transformer based on the comparison results.

[0108] Through the above technical solution, this example provides a comprehensive analysis device for dissolved gas in transformer oil. When analyzing the dissolved gas in the oil, the transformer oil is first sampled at fixed time intervals through the sample sampling module, and the sample is pre-processed and sent to the test. Then, the dissolved gas content in the oil at different sampling time points is detected by the dissolved gas detector based on the online chromatographic original spectrum method, and the operating status data of the transformer and the status data of the mineral insulating oil are collected by the data acquisition module. Then, the data calculation module can be combined with the data collected by the data acquisition module and the dissolved gas content data in the oil obtained by each detection of the dissolved gas detector to correct the dissolved gas content in the oil each time to obtain the original data of the dissolved gas content. Finally, the fluctuation value of the original data of the dissolved gas content at each sampling time point can be calculated by the data analysis module, and a judgment can be made on whether there is an abnormality in the detection accuracy of the dissolved gas detector based on the calculation result. When it is judged that the detection accuracy of the dissolved gas detector is abnormal, the dissolved gas detector is replaced and retested. Otherwise, the dissolved gas content in the oil obtained by each detection of the dissolved gas detector can be compared with the preset gas content threshold through the data evaluation module, and the transformer can be judged based on the comparison result whether there is a fault inside the transformer.

[0109] With such a setting, by combining the data acquisition module to collect the operating status data of the transformer and the status data of the mineral insulating oil, and then combining the data to correct the dissolved gas content in the oil at each detection, the original data of the dissolved gas content in the oil before being affected by the operating status data of the transformer and the status data of the mineral insulating oil can be obtained. Then, by combining the fluctuation values ​​of all the original data at each sampling time point for analysis, it can be determined whether the dissolved gas detector has any operating abnormalities during operation, thereby ensuring that the subsequent judgment of whether there is a fault inside the transformer is based on data with higher accuracy, thereby improving the accuracy of the judgment result.

[0110] A storage medium having stored thereon a program for comprehensive analysis of dissolved gases in oil, wherein when the program is executed by a processor, steps of a method for comprehensive analysis of dissolved gases in transformer oil are implemented;

[0111] Through the above technical solution, this example provides a storage medium, which stores a computer program. When the computer-readable storage medium is run on a computer, it enables the computer to execute the corresponding content in the aforementioned method embodiment, and the above storage medium may include but is not limited to any type of disk, including floppy disks, hard disks, optical disks, magneto-optical disks, read-only memories, random access memories, and erasable programmable read-only memories, etc.

[0112] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A comprehensive analysis method for dissolved gases in transformer oil, characterized in that: The method comprises: S1: The transformer oil is sampled at fixed time intervals through the sampling module, and the sampled samples are pre-processed to generate the oil samples to be tested at each sampling time point; S2: The oil samples to be tested at different sampling time points are tested by a dissolved gas detector based on the online chromatographic original spectrum method to generate the dissolved gas content in the oil at each sampling time point; S3: collecting the transformer operating status data and mineral insulating oil status data at each sampling time point through the data acquisition module; S4: The data calculation module corrects the dissolved gas content in the oil at each sampling time point based on the transformer operating status data and the mineral insulating oil status data collected by the data acquisition module, thereby generating raw data of the dissolved gas content at each sampling time point; S5: Calculate the fluctuation value of the raw data of the dissolved gas content at each sampling time point through the data analysis module to generate a corresponding fluctuation value; determine whether there is an abnormality in the detection accuracy of the dissolved gas detector based on the corresponding fluctuation value. If not, jump to step S6; if yes, jump to step S1 after replacing the dissolved gas detector; S6: The dissolved gas content in the oil at each sampling time point detected by the dissolved gas detector is compared with a preset gas content threshold value through the data evaluation module, and whether there is a fault inside the transformer is determined based on the comparison result.

2. The method for comprehensive analysis of dissolved gases in transformer oil according to claim 1, wherein: The method comprises: correcting the dissolved gas content in the oil at each sampling time point based on the transformer operation status data and the mineral insulating oil status data collected by the data acquisition module to generate the raw data of the dissolved gas content at each sampling time point; and S41: Calculating an error correction coefficient of the dissolved gas content in the oil at each sampling time point based on the operating status data of the transformer and the status data of the mineral insulating oil; S42: Correcting the dissolved gas content in the oil at each sampling time point according to the error correction coefficient to generate original data of the dissolved gas content at each sampling time point.

3. The method for comprehensive analysis of dissolved gases in transformer oil according to claim 1, wherein: The operating status data of the transformer, including transformer operating temperature, load and number of arc discharges; The state data of the mineral insulating oil includes the oil pressure of the mineral insulating oil.

4. The method for comprehensive analysis of dissolved gases in transformer oil according to claim 3, wherein: The error correction coefficient of the dissolved gas content in oil at each sampling time point is calculated using the following formula: Among them, μ i is the error correction coefficient of the dissolved gas detector at the time of the i-th detection, i is any detection time point of the dissolved gas detector, fh i is the transformer load during the i-th detection of the dissolved gas detector, fh y is the preset load, wd i is the transformer operating temperature during the i-th detection by the dissolved gas detector, wd y is the preset operating temperature threshold, wd b wd i The standard value of p i The total number of arc discharges during the i-th detection of the dissolved gas detector, p y is the preset number of arc discharges, c is any arc discharge, qd c is the discharge intensity of the cth arc discharge, yl i is the oil pressure of the dissolved gas detector during the i-th detection, yl y is the preset oil pressure threshold, yl b For yl i The standard value of f m To define a function, if f m (x)≥x, then let f m =x, otherwise, let f m =1, x1 and x2 are weight coefficients.

5. A comprehensive analysis method of dissolved gases in transformer oil according to claim 4, characterized in that: The dissolved gas content in the oil at each sampling time point is corrected using the following formula to generate the raw data of the dissolved gas content at each sampling time point: Among them, δ i is the original data of dissolved gas content during the i-th detection by the dissolved gas detector, qit i is the dissolved gas content in oil obtained by the dissolved gas detector during the i-th detection, ω is the error influence coefficient, and f w is an adjustment coefficient comparison table function, wherein the adjustment coefficient comparison table function f w The value of μ i *The values ​​of ω correspond one to one.

6. The method for comprehensive analysis of dissolved gases in transformer oil according to claim 5, characterized in that: The data analysis module calculates the fluctuation value of the raw data of dissolved gas content at each sampling time point using the following formula to generate the corresponding fluctuation value: Among them, γ i is the fluctuation value of the original data of all dissolved gas contents from the beginning of the detection to the i-th detection of the dissolved gas detector, t i is the total number of detections of the dissolved gas detector from the start of detection to the i-th detection, For all δ i The average value of For all δ i The maximum value in For all δ i The minimum value in , g is the proportional coefficient.

7. A comprehensive analysis method of dissolved gases in transformer oil according to claim 6, characterized in that: The method comprises: judging whether the detection accuracy of the dissolved gas detector is abnormal based on the corresponding fluctuation value; if not, jumping to step S6; if yes, replacing the dissolved gas detector and retesting, jumping to step S1, including: The fluctuation value γ of the original data of all dissolved gas content from the beginning of the dissolved gas detector to the i-th detection i and the preset fluctuation value threshold γ 01 Make a comparison; If γ i ≥γ 01 , judging that the detection accuracy of the dissolved gas detector is abnormal; sending an alarm signal for replacing the dissolved gas detector, and after replacing the dissolved gas detector, jumping to step S1; If γ i <γ 01 , determine that there is no abnormality in the detection accuracy of the dissolved gas detector; jump to step S6.

8. The method for comprehensive analysis of dissolved gases in transformer oil according to claim 7, characterized in that: The method of comparing the dissolved gas content in the oil at each sampling time point detected by the dissolved gas detector with a preset gas content threshold, and judging whether there is a fault inside the transformer based on the comparison result, includes: The dissolved gas content in the oil obtained by the dissolved gas detector during the i-th test is qit i Compare with the preset gas content threshold interval [β1, β2]; If qit i ∈[β1, β2], it is judged that there is no fault inside the transformer at this time point; like It is determined that there is a fault inside the transformer at this time point.

9. A comprehensive analysis device for dissolved gases in transformer oil, characterized in that: include: The sample sampling module is used to sample transformer oil at fixed time intervals and pre-process the sampled samples to generate the oil samples to be tested at each sampling time point; Dissolved gas detector, used to detect the oil samples at different sampling time points based on the online chromatographic original spectrum method, and generate the dissolved gas content in the oil at each sampling time point; A data acquisition module is used to collect the operating status data of the transformer and the status data of the mineral insulating oil at each sampling time point; A data calculation module is used to correct the dissolved gas content in the oil at each sampling time point based on the transformer operating status data and mineral insulating oil status data collected by the data acquisition module, and generate raw data of the dissolved gas content at each sampling time point; The data analysis module is used to calculate the fluctuation value of the original data of the dissolved gas content at each sampling time point and generate the corresponding fluctuation value; based on the corresponding fluctuation value, it is judged whether there is any abnormality in the detection accuracy of the dissolved gas detector; If no, the data evaluation module is called, and if yes, the sample sampling module is called again after replacing the dissolved gas detector; The data evaluation module is used to compare the dissolved gas content in the oil at each sampling time point detected by the dissolved gas detector with the preset gas content threshold, and determine whether there is a fault inside the transformer based on the comparison results.

10. A storage medium, characterized in that: The storage medium stores a comprehensive analysis program for dissolved gases in oil, which, when executed by a processor, implements the steps of a comprehensive analysis method for dissolved gases in transformer oil according to any one of claims 1 to 8.

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