A system for rapid calibration of an online monitoring device for dissolved gases in oil

Abstract

The application provides a kind of oil dissolved gas on-line monitoring device fast checking system, belong to the on-line monitoring technical field of electric power transformer.The system includes central controller, data acquisition module, data analysis module, standard oil storage tank module and oil circuit module.The system obtains the data of oil dissolved gas on-line monitoring device, standard oil data, bulk oil data and the signal of monitoring device itself operation through data acquisition module, uses data analysis module to use systematic analysis technology to quickly detect whether oil dissolved gas on-line monitoring device appears equipment abnormal condition, and accurately checks the data.The systematic reading and analysis of relevant data avoids human operation errors, thereby reducing the risk of incorrect judgment, and improves the operation quality and efficiency of oil dissolved gas on-line monitoring device.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of on-line monitoring of power transformers, and particularly relates to a system for rapid calibration of an on-line monitoring device for dissolved gases in oil. BACKGROUND

[0002] A power transformer is one of important devices in a power system, and its normal operation is crucial to the safety of the entire power grid system. During operation, the insulating oil and solid insulating material of the transformer are subjected to the effects of electricity, heat, oxidation and local electric arc, thereby generating a series of characteristic gases, including H2, CO, CO2, CH4, C2H6, C2H2, C2H4, etc.

[0003] The prior art adds a main transformer dissolved gas on-line monitoring device to the transformer to periodically and automatically monitor the content of dissolved gas components in the transformer oil, and transmits the characteristic gas amount monitoring value in the oil to an on-line monitoring system for equipment monitoring by operation and maintenance personnel, so as to facilitate real-time monitoring of the operation of the transformer.

[0004] A common calibration process of the on-line monitoring device is to inject different concentrations of standard oil into the on-line monitoring device for dissolved gases in oil for detection, and manually compare the detection results of the on-line monitoring device with the detection results of the standard oil in the laboratory to determine whether the deviation meets the requirements. However, manual judgment of whether it is qualified has the disadvantages of large workload, easy calculation error of data, low efficiency, large error, etc. SUMMARY

[0005] Therefore, the present application aims to solve the problems of large workload, easy calculation error of data, low efficiency, large error, etc. in the manual calibration process based on the on-line monitoring device.

[0006] To solve the above technical problems, the present application provides the following technical solutions:

[0007] A system for rapid calibration of an on-line monitoring device for dissolved gases in oil, comprising: a central controller, a data acquisition module, a data analysis module, a standard oil storage tank module and an oil circuit module;

[0008] The central controller is used to control the entire system, and simultaneously control other modules by using a central man-machine interface;

[0009] The data acquisition module is used for collecting data of the online monitoring device of dissolved gas in oil, standard oil data, bulk oil data and signals of running of the monitoring device itself, and transmitting the collected signals to the central controller, wherein the data of the online monitoring device of dissolved gas in oil refers to the content of dissolved gas in oil obtained by daily monitoring of the device, the standard oil data refers to the content of dissolved gas in oil obtained by experiment with a laboratory gas chromatograph after the standard oil is stable, and the bulk oil data refers to the content of dissolved gas in oil obtained by experiment with a laboratory gas chromatograph on the bulk oil sample of the transformer;

[0010] The data analysis module is used for analyzing the data, the standard oil data and the bulk oil data of the online monitoring device of dissolved gas in oil, and checking the monitoring device;

[0011] The standard oil storage tank module is used for storage and transportation of a standard oil sample, which is an oil sample for checking of the online monitoring device of dissolved gas in oil;

[0012] The oil circuit module is a pipeline for connecting the standard oil storage tank and the online monitoring device of dissolved gas in oil, and the standard oil storage tank end connector and the online monitoring device of dissolved gas in oil end connector are each provided with a check valve.

[0013] Further, the central controller controls other modules by using a central man-machine interface, specifically including:

[0014] The central controller controls a state of the standard oil storage tank, and the state of the standard oil storage tank at least includes oil feeding, checking, cleaning and pressure regulating;

[0015] The central controller controls a state of the online monitoring device of dissolved gas in oil, and starts the online monitoring device of dissolved gas in oil to start checking work;

[0016] The central controller controls a state of the data acquisition module, receives laboratory data of standard oil and laboratory data of bulk oil transmitted from the laboratory by a mode of wireless transmission of the Internet of Things card, and receives daily data and checking data of the online monitoring device of dissolved gas in oil.

[0017] Further, the monitoring device is checked based on the data analysis module, specifically including:

[0018] The online monitoring device of dissolved gas in oil is subjected to running state self-checking analysis and reliability checking based on the data collected by the data acquisition module;

[0019] If the monitoring device is self-checked to be qualified, the standard oil checking is performed, and a state of the monitoring device is evaluated based on a result of the standard oil checking.

[0020] Further, the online monitoring device of dissolved gas in oil is subjected to running state self-checking analysis based on the data collected by the data acquisition module, specifically including:

[0021] Detect whether the gas source module, the gas path module, the detection module, the oil path module and the communication module of the online monitoring device of the dissolved gas in oil are normally operated based on the data collected by the data collection module;

[0022] If part of the modules in the monitoring device are not normally operated, feedback to the central controller to adjust the operation strategy.

[0023] Further, the reliability of the online monitoring device of the dissolved gas in oil is checked based on the data collected by the data collection module, specifically including:

[0024] Qualitative check of each component of the dissolved gas in oil is performed based on the data collected by the data collection module, and whether there is 0 between the data of the oil laboratory and the daily data of the online monitoring device of the dissolved gas in oil and whether the difference between the corresponding data meets the set threshold value are determined to determine whether the online monitoring device of the dissolved gas in oil is qualified.

[0025] If the qualitative check is qualified, quantitative check is performed, the data of the oil laboratory and the daily data of the online monitoring device of the dissolved gas in oil are checked, and whether the error of the corresponding data of each component meets the set requirement is determined, if it meets, the reliability check of the monitoring device is passed.

[0026] Further, the process of the standard oil check specifically includes:

[0027] The central controller closes the oil valve by using the electromagnetic valve and opens the check valve by using the electromagnetic valve.

[0028] The central controller controls the standard oil tank to start the cleaning mode, and repeatedly cleans the oil path pipeline by using the standard oil; after the check is completed, the oil path pipeline is repeatedly cleaned by using the transformer oil.

[0029] The central controller controls the online monitoring device of the dissolved gas in oil to start the detection mode.

[0030] The data collection module collects the standard oil check data and the standard oil laboratory data.

[0031] The data analysis module performs quantitative check on the collected standard oil data.

[0032] Further, the specific calculation formula of the quantitative check is as follows:

[0033] Absolute error = online calibration value - experimental calibration value ≤ set requirement value

[0034] Relative error = (online calibration value - experimental calibration value) / experimental calibration value × 100% ≤ 30%

[0035] Wherein, the set requirement value is determined according to the technical specification of the online monitoring device of the dissolved gas in transformer oil.

[0036] Further, the method further comprises evaluating the state of the monitoring device according to the check result, specifically:

[0037] When the relative error of the key components is greater than the first set threshold or the absolute error exceeds the first limit value, the monitoring device is evaluated as unqualified, and the key components include H2, CH4, C2H6, C2H2, C2H4 and total hydrocarbon;

[0038] When the relative error of the key components is less than the first set threshold or the absolute error does not exceed the first limit value, and the relative error of one of the CO and CO2 components is greater than the first set threshold or the absolute error exceeds the first limit value, the monitoring device is evaluated as qualified, and the monitoring device is continuously checked for standard oil;

[0039] When the relative error of all components is less than the first set threshold or the absolute error does not exceed the first limit value, the monitoring device is evaluated as good;

[0040] When the relative error of all components is less than the second set threshold or the absolute error does not exceed the second limit value, the monitoring device is evaluated as excellent, wherein the second set threshold is less than the first set threshold, and the second limit value is less than the first limit value.

[0041] Further, the first set threshold is ± 30%, and the second set threshold is ± 15%.

[0042] Further, the central controller is further used for monitoring the online monitoring data of the oil dissolved gas, and the specific process includes:

[0043] Initializing the system flow monitoring variable, loading the main variable oil dissolved gas monitoring interface;

[0044] Viewing the devices on the main variable oil dissolved gas monitoring interface one by one, grabbing the offline device data according to the state column, and recording the abnormal device account information according to the data garbled situation;

[0045] Opening the devices with online monitoring state of the oil dissolved gas one by one, grabbing and recording the oil dissolved characteristic gas value of each main variable, and obtaining the historical data of each device in a set time period;

[0046] Based on the oil dissolved characteristic gas value and the historical data, the oil dissolved gas data is analyzed for abnormality.

[0047] In summary, this invention provides a system for rapid calibration of an online dissolved gas monitoring device for oil, comprising a central controller, a data acquisition module, a data analysis module, a standard oil storage tank module, and an oil circuit module. The system acquires data from the online dissolved gas monitoring device, standard oil data, mains oil data, and signals from the monitoring device's operation via the data acquisition module. The data analysis module uses systematic analysis techniques to quickly detect any equipment malfunctions in the online dissolved gas monitoring device and verifies the accuracy of the data. By systematically reading and analyzing relevant data, the risk of human error leading to incorrect judgments is avoided, thus improving the operational quality and efficiency of the online dissolved gas monitoring device. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 A system architecture diagram of a system for rapid calibration of an online dissolved gas monitoring device in oil, provided in an embodiment of the present invention;

[0050] Figure 2 This is a flowchart illustrating the self-test and reliability verification process of the online dissolved gas monitoring device in oil provided in this embodiment of the invention.

[0051] Figure 3 A flowchart for determining abnormal states of equipment containing dissolved gases in main transformer oil, provided in an embodiment of the present invention. Detailed Implementation

[0052] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0053] Please see Figure 1 This invention provides a system for rapid calibration of an online dissolved gas monitoring device in oil, comprising: a central controller, a data acquisition module, a data analysis module, a standard oil storage tank module, and an oil circuit module.

[0054] The central controller is used for controlling the whole system, and meanwhile controlling other modules by using a central man-machine interface;

[0055] The data acquisition module is used for acquiring data of the online monitoring device for dissolved gas in oil, standard oil data, bulk oil data and signals of the monitoring device itself, and transmitting the acquired signals to the central controller, wherein the data of the online monitoring device for dissolved gas in oil refers to the content of the dissolved gas in oil obtained by daily monitoring of the device, the standard oil data refers to the content of the dissolved gas in oil obtained by experiments on the stable standard oil by using a laboratory gas chromatograph, and the bulk oil data refers to the content of the dissolved gas in oil obtained by experiments on the bulk oil sample of the transformer by using a laboratory gas chromatograph.

[0056] The data analysis module is used for analyzing the data of the online monitoring device for dissolved gas in oil, the standard oil data and the bulk oil data, and verifying the monitoring device.

[0057] The standard oil storage tank module is used for storage and transportation of standard oil samples, and the standard oil samples are oil samples used for verification of the online monitoring device for dissolved gas in oil.

[0058] The oil circuit module is a pipeline used for connecting the standard oil storage tank and the online monitoring device for dissolved gas in oil, and the end connector of the standard oil storage tank and the end connector of the online monitoring device for dissolved gas in oil are both provided with check valves.

[0059] The embodiment provides a system for rapid verification of an online monitoring device for dissolved gas in oil, data of the online monitoring device for dissolved gas in oil, standard oil data, bulk oil data and signals of the monitoring device itself are acquired by using a data acquisition module, and whether the online monitoring device for dissolved gas in oil appears abnormal equipment condition is rapidly detected by using a data analysis module by using systematic analysis technology, and accuracy verification is performed on the data. By systematically reading and analyzing relevant data, the risk of judgment error caused by human operation errors is avoided, and the operation quality and efficiency of the online monitoring device for dissolved gas in oil are improved.

[0060] In one embodiment of the present application, the central controller controls the whole system, and specifically includes:

[0061] The central controller adopts a microcomputer system, and adjusts the operation strategy by using a virtual-real combination mode, so that the execution condition and efficiency of the operation strategy can be intuitively reflected on the observation man-machine interface and the real hardware in time, and the real hardware, the timeliness, flexibility, openness and safety of real-time simulation are combined.

[0062] The central controller can control the state of the marking oil storage tank. The signal of the marking oil storage tank is fed back to the central controller in time, and the operation strategy can be adjusted in time. The selectable states include oil feeding, calibration, cleaning, pressure adjustment, etc. The execution of the operation strategy can be intuitively reflected on the observation man-machine interface and the marking oil storage tank through the man-machine interface. At the same time, mechanical operation can be directly performed on the marking oil storage tank, and the state of the marking oil storage tank can also be adjusted. The oil feeding refers to injecting the marking oil into the marking oil storage tank. The calibration refers to injecting the marking oil in the marking oil storage tank into the oil dissolved gas online monitoring device for inspection. The cleaning refers to cleaning the marking oil storage tank and the oil line with the bulk oil or new oil to remove the characteristic gas of the marking oil, so as to avoid affecting the daily data of the oil dissolved gas online monitoring device and avoid affecting the inspection of the next marking oil due to the residual characteristic gas of the marking oil storage tank.

[0063] The central controller can control the state of the oil dissolved gas online monitoring device, and can start the oil dissolved gas online monitoring device to start the calibration work. At the same time, the running state of each module of the oil dissolved gas online monitoring device is fed back to the central controller, and the execution and efficiency of the operation strategy can be intuitively reflected on the observation man-machine interface and the oil dissolved gas online monitoring device in time.

[0064] The central controller can control the state of the data acquisition module. Through the mode of wireless transmission of the Internet card, the laboratory data of the marking oil and the laboratory data of the bulk oil transmitted from the laboratory are received, and the daily data and calibration data of the oil dissolved gas online monitoring device are received. The running state and reliability of the device are judged by using an algorithm. The specific implementation of the algorithm is shown in Figure 2 .

[0065] Specifically, the judgment process of the running state and the reliability is as follows:

[0066] Firstly, the state of the oil dissolved gas online monitoring device is self-checked and analyzed, which specifically includes detecting whether the gas source module, the gas path module, the detection module, the oil path module, and the communication module of the oil dissolved gas online monitoring device are normally operated. The specific steps are as follows:

[0067] Step 1: If part of the modules in the device do not operate normally, the signal is fed back to the central controller, and the running strategy is adjusted to carry out inspection and maintenance work. If the device operates normally, the reliability of the oil dissolved gas online monitoring device is inspected, and the bulk oil laboratory data and the daily data of the oil dissolved gas online monitoring device on the sampling day of the bulk oil are compared.

[0068] Step 2: qualitative calibration, especially acetylene content calibration. If there is a difference between the device body oil laboratory data and the daily data of the oil dissolved gas online monitoring device on the day of the body oil sampling, and the absolute value of the difference is ≥0.03 μL / L, it is directly determined that the oil dissolved gas online monitoring device is unqualified, and the device needs to be checked and maintained before rechecking. If the qualitative calibration is qualified, proceed to step 3.

[0069] Step 3: quantitative calibration, which requires calibration of each component of the body oil laboratory data and the daily data of the oil dissolved gas online monitoring device on the day of the body oil sampling, including H2, CO, CO2, CH4, C2H6, C2H2, C2H4, total hydrocarbon, etc. Calculate the absolute error and relative error of "online calibration value" and "experimental calibration value". According to the industry standard, determine whether the online data meets the requirements, and the specific data analysis is as follows.

[0070] Step 4: According to the provided information, error analysis is performed on the 8 components of the oil dissolved gas, and the specific formula is:

[0071] Absolute error = online calibration value - experimental calibration value ≤ specific requirements in Table 1

[0072] Relative error = (online calibration value - experimental calibration value) / experimental calibration value × 100% ≤ 30%

[0073] According to the requirements of "Technical Specification for Online Monitoring Device of Dissolved Gas in Transformer Oil", if the relative error of the measured components is greater than ±30% or the absolute error exceeds the limit value (see Table 1 for details), it is determined whether the calibration of the body oil laboratory data and the daily data of the oil dissolved gas online monitoring device on the day of the body oil sampling is qualified. If not, the device needs to be checked and maintained before rechecking.

[0074] Table 1 Q / CSG1203025-2017 Technical Specification for Online Monitoring Device of Dissolved Gas in Transformer Oil

[0075]

[0076] Secondly, after the device self-checking is qualified, the standard oil calibration is carried out. After the device self-checking is qualified, the signal is fed back to the central controller, and the central controller receives the signal and starts the standard oil calibration program. The specific steps are as follows:

[0077] Step 1: Connect the oil inlet pipeline and the oil return pipeline to the standard oil storage tank and the oil dissolved gas online monitoring device;

[0078] Step 2: The central controller closes the body oil valve using the electromagnetic valve and opens the calibration valve using the electromagnetic valve;

[0079] Step 3: The central controller controls the oil tank to start the cleaning mode, and uses the oil to clean the oil pipeline. The cleaning is repeated 10 times to ensure the accuracy and reliability of the test results.

[0080] Step 4: The central controller controls the oil dissolved gas online monitoring device to start the detection mode.

[0081] Step 5: The data acquisition module collects the calibration data and the laboratory data of the oil.

[0082] Step 6: The collected oil data is quantitatively corrected, including H2, CO, CO2, CH4, C2H6, C2H2, C2H4, and total hydrocarbons. The absolute error and relative error of the "online calibration value" and "experimental calibration value" are calculated and analyzed. According to the industry standard, it is judged whether the online data meets the requirements. The specific data analysis is as follows.

[0083] According to the provided information, the error analysis of the eight components of the oil dissolved gas is as follows:

[0084] Absolute error = online calibration value - experimental calibration value ≤ specific requirements in Table 1

[0085] Relative error = (online calibration value - experimental calibration value) / experimental calibration value × 100% ≤ 30% According to the requirements of the "Technical Specification for Transformer Oil Dissolved Gas Online Monitoring Device", it is judged whether the calibration of the oil laboratory data and the oil calibration data is qualified. If not, the device needs to be checked and maintained before calibration.

[0086] Finally, according to the calibration results, the state of the device is evaluated. According to the different severity of the measurement error limit value requirements, the accuracy of the calibration is determined, usually divided into A, B, C, D levels, among which D level represents unqualified device.

[0087] If the relative error of the measured key components (H2, CH4, C2H6, C2H2, C2H4, total hydrocarbons) is greater than ± 30% or the absolute error exceeds the limit value (see Table 1 for details), it means that the device is D level, and the device is judged to be unqualified and needs to be checked and maintained before calibration.

[0088] If the relative error of the measured key components (H2, CH4, C2H6, C2H2, C2H4, total hydrocarbons) is less than ± 30% or the absolute error does not exceed the limit value, and one of the CO and CO2 components reaches the relative error greater than ± 30% or the absolute error exceeds the limit value (see Table 1 for details), it means that the device is C level, and the device is judged to be qualified, but needs to be tracked and can continue to be calibrated with oil.

[0089] B level requires that the measurement error of all components is not more than ± 30% or the absolute error does not exceed the limit value. When determining the analysis result, the relative error of each component is compared, and it can be determined to be good.

[0090] A level requires that the measurement error is not more than ± 15% or the absolute error does not exceed the limit value of 50%. When determining the analysis result, the relative error of each component is compared, and it can be determined to be excellent.

[0091] Through the above process, the systematic analysis technology of the central controller can intelligently analyze the main variable chromatographic data, extract key information, calculate errors, and judge the qualification of online data according to industry standards. At the same time, the accuracy verification of dissolved gas data in oil also includes calibration using transformer standard oil to further ensure the accuracy of the dissolved gas online monitoring device in oil.

[0092] The system is also applied to the monitoring of online monitoring data of dissolved gas in oil. The abnormal analysis of dissolved gas data in oil is a prerequisite for the accuracy verification of online data of dissolved gas in oil. The daily data of the dissolved gas online monitoring device in oil is analyzed and judged to confirm that the dissolved gas online monitoring device in oil is not in abnormal condition. Generally speaking, device abnormalities usually include the following three cases: equipment offline, all characteristic gas components are 0, and data update abnormality (characteristic gas data does not show complete or random code, continuous two days of data are the same and do not show offline, date stays two days ago and does not show offline, etc.). For these abnormal conditions, the chromatographic data abnormality determination process is as shown in Figure 3 The specific implementation is as follows:

[0093] Firstly, the systematic process monitoring variables need to be initialized, which specifically includes the systematic online of the main transformer dissolved gas equipment state, the opening of the specified item monitoring window, the loading of the "main transformer dissolved gas monitoring" interface, and the setting of the system work time length, the running feedback contact person and contact method of the systematic monitoring result.

[0094] Secondly, the equipment on the main transformer dissolved gas interface is checked one by one, the data of the "offline" equipment is grabbed according to the "state" column using the network crawler, and the "device abnormality" account information is recorded according to the data random code and other conditions, such as substation, equipment voltage, equipment name, manufacturer information, etc.

[0095] Thirdly, the equipment with "online" state of the dissolved gas online monitoring device is opened one by one, and the dissolved characteristic gas values (such as hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide, carbon dioxide, total hydrocarbon) of each main transformer are grabbed and recorded by the network crawler. At the same time, click on the "history data" window to obtain the historical data of each equipment in the past one month, and store it in the data package.

[0096] Thirdly, it is necessary to determine whether the characteristic gas content exceeds the standard and to make threshold value judgment on the characteristic gas. According to the robot monitoring procedure, it is calculated whether the absolute value of the characteristic gas dissolved in the main transformer oil exceeds the attention value and the alarm value.

[0097] Thirdly, it is necessary to determine whether the characteristic gas content exceeds the standard and to make threshold value judgment on the characteristic gas. According to the robot monitoring procedure, it is calculated whether the absolute value of the characteristic gas dissolved in the main transformer oil exceeds the attention value and the alarm value.

[0098] At the same time, the historical data is compared in the longitudinal direction, and the total hydrocarbon gas production rate is calculated. The specific calculation formula is (the gas quantity of the day - the gas quantity one month ago) ÷ the gas quantity one month ago. If the gas quantity one month ago is missing, the latest valid data is used for conversion judgment.

[0099] Finally, the gas production rate is compared with the threshold value to determine whether the equipment has data anomalies.

[0100] Based on the abnormal analysis of the oil dissolved gas data, it is necessary to further verify the accuracy of the data. The above-mentioned devices with device anomalies do not need to be further verified for accuracy, so we mainly focus on the in-depth study of the characteristic gas content of the oil dissolved gas data with data anomalies and normal data.

[0101] The data provided by the online monitoring system is the online monitoring data of the oil dissolved gas, and the monitoring frequency is once a day, and the data is uploaded. According to the power equipment maintenance test procedure, the test personnel need to perform chromatographic analysis of the oil dissolved gas in the transformer and the reactor according to a certain period.

[0102] For newly operated transformers and reactors, at least the first day, the fourth day, the tenth day and the thirtieth day after operation should be monitored. And for the running main transformer, chromatographic analysis is required according to the requirements of the main transformer level. For example, for a 500kV main transformer, analysis is performed once every three months; for a 220kV main transformer, analysis is performed once every six months; and for a 35kV to 110kV main transformer, analysis is performed once a year, and more frequent testing may be required.

[0103] When the system's data acquisition module collects data every time the bulk oil is taken to the laboratory for experiment, the data is compared with the daily data of the oil dissolved gas online monitoring device on the sampling day, and the absolute error and the relative error of the "online calibration value" and the "experimental calibration value" are calculated and analyzed. According to the industry standard, it is judged whether the online data meets the requirements. If the device fails to pass the calibration, the device will be listed as a state of attention.

[0104] At present, we can select a device running well and data analysis accurate, and analyze its online data in the past 12 months. After calculation, the fluctuation range of the normal online data is not more than 15%. The influence on the accuracy determination can be ignored. Therefore, we can use the online data of dissolved gas in oil on the same day and the characteristic gas data of the last manual pre-test for analysis and comparison to evaluate the accuracy of the data.

[0105] The present application provides a system for rapid verification of an online monitoring device for dissolved gas in oil. By using systematic analysis technology to analyze and judge the data of dissolved gas in oil, not only can the abnormal situation of the online monitoring device for dissolved gas in oil be quickly detected, but also the online data of dissolved gas in oil can be compared with the laboratory verification value for analysis and comparison, and the accuracy of the data can be verified. By systematic reading and analysis and generating a report, the risk of human operation error is avoided, and the running quality and efficiency of the online monitoring device for dissolved gas in oil are improved.

[0106] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A system for rapid calibration of an online dissolved gas monitoring device in oil, characterized in that, include: Central controller, data acquisition module, data analysis module, standard oil storage tank module, and oil circuit module; The central controller is used to control the entire system, and at the same time, the central human-machine interface is used to control other modules. The data acquisition module is used to collect data from the online dissolved gas monitoring device, standard oil data, main body oil data, and signals from the operation of the monitoring device itself, and transmit the collected signals to the central controller. The data from the online dissolved gas monitoring device refers to the content of dissolved gases in the oil obtained from the daily monitoring of the device. The standard oil data is the content of dissolved gases in the oil obtained by laboratory gas chromatography after the index oil has stabilized. The main body oil data refers to the content of dissolved gases in the transformer main body oil sample obtained by laboratory gas chromatography. The data analysis module is used to analyze the data from the online dissolved gas monitoring device, the standard oil data, and the bulk oil data to verify the monitoring device. The standard oil storage tank module is used for the storage and transportation of standard oil samples, which are the oil samples used for calibration of the online dissolved gas monitoring device in oil. The oil circuit module is a pipeline used to connect the standard oil storage tank and the online dissolved gas monitoring device in the oil, and both the standard oil storage tank end connector and the online dissolved gas monitoring device end connector are equipped with check valves; The monitoring device is calibrated based on the data analysis module, including a reliability verification of the online dissolved gas monitoring device in oil based on the data collected by the data acquisition module. The reliability verification includes: Based on the data collected by the data acquisition module, the components of dissolved gas in the oil are qualitatively verified. The online monitoring device for dissolved gas in the oil is judged to be qualified based on whether there is 0 in the laboratory data of the bulk oil and the daily data of the online monitoring device for dissolved gas in the oil, and whether the difference between the corresponding data meets the set threshold. If the qualitative calibration is qualified, then quantitative calibration is performed. The laboratory data of the bulk oil and the daily data of the online dissolved gas monitoring device in the oil are calibrated to determine whether the error of the corresponding data of each component meets the set requirements. If it does, the reliability verification of the monitoring device is passed.

2. The system for rapid calibration of the online dissolved gas monitoring device in oil according to claim 1, characterized in that, The central controller uses a central human-machine interface to control other modules, specifically including: The central controller controls the status of the standard oil storage tank, and the status of the standard oil storage tank includes at least oil inlet, calibration, cleaning and pressure adjustment. The central controller controls the status of the online dissolved gas monitoring device in oil and starts the online dissolved gas monitoring device in oil to begin calibration. The central controller controls the status of the data acquisition module and receives laboratory data of standard oil and main oil transmitted from the laboratory via IoT card wireless transmission mode. It also receives daily data and calibration data from the online dissolved gas monitoring device in the oil.

3. The system for rapid calibration of the online dissolved gas monitoring device in oil according to claim 2, characterized in that, The verification of the monitoring device based on the data analysis module also includes: The operating status of the online monitoring device for dissolved gases in oil is analyzed based on the data collected by the data acquisition module. If the monitoring device passes the self-test, a standard oil calibration is performed, and the status of the monitoring device is evaluated based on the results of the standard oil calibration.

4. The system for rapid calibration of the online dissolved gas monitoring device in oil according to claim 3, characterized in that, Based on the data collected by the data acquisition module, a self-check analysis of the operating status of the online dissolved gas monitoring device in oil is performed, specifically including: Based on the data collected by the data acquisition module, it is determined whether the gas source module, gas path module, detection module, communication module, and oil path module of the online dissolved gas monitoring device in oil are operating normally. If some modules in the monitoring device malfunction, the feedback is sent to the central controller so that the operating strategy can be adjusted.

5. The system for rapid calibration of the online dissolved gas monitoring device in oil according to claim 3, characterized in that, The standard oil calibration process specifically includes: The central controller uses a solenoid valve to close the main oil valve and to open the calibration valve. The central controller controls the standard oil tank to start the cleaning mode, using the standard oil to repeatedly clean the oil pipeline; after the calibration is completed, the transformer body oil is used to repeatedly clean the oil pipeline. The central controller activates the online monitoring device for dissolved gases in oil, initiating the detection mode. The data acquisition module is controlled to collect standard oil calibration data and standard oil laboratory data; The data analysis module is controlled to perform quantitative calibration of the collected standard oil data.

6. The system for rapid calibration of the online dissolved gas monitoring device in oil according to claim 1 or 5, characterized in that, The specific calculation formula for quantitative calibration is as follows: Absolute error = Online verification value - Experimental verification value ≤ Set requirement value Relative error = (Online verification value - Experimental verification value) / Experimental verification value × 100% ≤ 30% The set requirement value is determined according to the technical specifications of the online monitoring device for dissolved gases in transformer oil.

7. The system for rapid calibration of the online dissolved gas monitoring device in oil according to claim 6, characterized in that, It also includes evaluating the status of the monitoring device based on the verification results, specifically: When the relative error of the key component is greater than a first set threshold or the absolute error exceeds a first limit, the evaluation monitoring device is deemed unqualified. The key components include H2, CH4, C2H6, C2H2, C2H4 and total hydrocarbons. When the relative error of the key component is less than the first set threshold or the absolute error does not exceed the first limit, and the relative error of one of the CO and CO2 components is greater than the first set threshold or the absolute error exceeds the first limit, the monitoring device is evaluated as qualified, and the monitoring device continues to be calibrated with standard oil. When the relative error of all components is less than the first set threshold or the absolute error does not exceed the first limit, the monitoring device is rated as good. The monitoring device is rated as excellent when the relative error of all components is less than the second set threshold or the absolute error does not exceed the second limit. The second set threshold is less than the first set threshold, and the second limit is less than the first limit.

8. The system for rapid calibration of the online dissolved gas monitoring device in oil according to claim 7, characterized in that, The first set threshold is The second set threshold is .

9. The system for rapid calibration of the online dissolved gas monitoring device in oil according to claim 1, characterized in that, The central controller is also used for monitoring online data of dissolved gases in oil, and the specific process includes: Initialize the system process monitoring variables and load the dissolved gas monitoring interface in the main transformer oil; The equipment on the dissolved gas monitoring interface in the main transformer oil is checked one by one. Offline equipment data is captured according to the status column, and the abnormal equipment information is recorded according to the data garbled information. Turn on each of the devices with the online dissolved gas monitoring device status in the oil one by one, capture and record the dissolved characteristic gas values ​​in the oil of each main transformer, and obtain the historical data of each device within a set time period; Anomaly analysis of dissolved gas data in oil was conducted based on characteristic dissolved gas values ​​and historical data.

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