Verification Method of Online Oil Chromatography Monitoring Device Based on Insulating Oil Comparison of UHV Oil-filled Main Equipment

Abstract

This invention discloses a calibration method for an online oil chromatography monitoring device based on the comparison of insulating oil in ultra-high voltage (UHV) oil-filled main equipment. The method involves monthly offline comparisons of daily monitoring data from the online monitoring device and monthly offline oil chromatography data of the insulating oil in the UHV oil-filled main equipment. Based on the comparison results, pending and calibrated labels are added to the online monitoring device as needed. The manufacturer's personnel are promptly notified to conduct on-site debugging, maintenance, and calibration based on the accumulated number of calibrated labels. Simultaneously, the accumulated calibrated labels from the monthly offline comparisons will guide the annual periodic calibration of the online monitoring device. By combining the acetylene gas concentration in the main oil from the monthly offline oil chromatography data (whether it is greater than 0.2 μL / L) with the accumulated calibrated labels on the online monitoring device, differentiated annual periodic calibrations are conducted. This invention can significantly improve the accuracy of online monitoring devices and the efficiency of on-site operation and maintenance, and has promising application prospects.

Description

Technical Field

[0001] This invention relates to the field of online oil chromatography monitoring technology for oil-filled main equipment, specifically a verification method for an online oil chromatography monitoring device based on the comparison of insulating oil in ultra-high voltage oil-filled main equipment. Background Technology

[0002] Ultra-high voltage (UHV) and extra-high voltage (EHV) oil-filled main equipment is the core equipment supporting my country's UHV transmission backbone network. A failure in such equipment would result in enormous economic losses and the risk of casualties. Oil chromatography online monitoring technology, due to its outstanding advantages such as continuous monitoring, rapid fault detection, and real-time monitoring of the monitored equipment's status, has become the most effective means, widely recognized both domestically and internationally, to ensure the operational reliability of UHV and EHV oil-filled main equipment and support the safe operation of cross-regional power grids. However, due to the harsh on-site environment and increasing operating years, the accuracy of oil chromatography online monitoring devices gradually declines after commissioning, limiting the effectiveness of online monitoring and causing transformers to lose their reliable safety barrier. Typically, power departments use standard oil comparison to periodically calibrate oil chromatography online monitoring devices. However, indiscriminate standard oil comparison not only consumes significant manpower and resources, but the calibration operations may also affect the normal operation of even accurate online monitoring devices and pose a risk of moisture and oil leakage to the oil-filled main equipment.

[0003] In recent years, to improve the measurement accuracy of online oil chromatography monitoring devices, the power sector has shortened the periodic calibration cycle of these devices. Although the workload has increased dramatically compared to previous years, objectively speaking, annual calibration still cannot promptly detect online monitoring devices with declining accuracy. There is an urgent need to propose a method that can shorten the accuracy calibration cycle of online monitoring devices without increasing additional manpower costs. Summary of the Invention

[0004] The purpose of this invention is to provide a calibration method for an online oil chromatography monitoring device based on the comparison of insulating oil in ultra-high voltage (UHV) oil-filled main equipment. This method fully utilizes monthly offline chromatographic data from UHV and UHV oil-filled main equipment to conduct monthly offline comparisons of the online monitoring device. Based on the comparison results, it promptly notifies the manufacturer's personnel to conduct on-site debugging, maintenance, and calibration. Furthermore, during annual periodic calibration, online monitoring devices with satisfactory monthly offline comparison results do not require annual periodic calibration, or only need to be compared with a standard oil of a single concentration, significantly reducing the workload of annual periodic calibration. This invention is applicable to the accuracy calibration of online oil chromatography monitoring devices and has the advantages of short calibration cycles and low consumption of manpower and resources.

[0005] To achieve the above objectives, the present invention provides a calibration method for an online oil chromatography monitoring device based on the comparison of insulating oil in ultra-high voltage oil-filled main equipment, comprising the following steps:

[0006] Step 1: Enter the monthly offline oil chromatography data M of the insulating oil of the UHV main equipment and the corresponding oil sampling time T into the data processing platform. After removing duplicate data from the online monitoring data, count the online monitoring data closest to the oil sampling time T and the two sets of online monitoring data before and after it, for a total of 5 sets of data, and calculate the average value D of the 5 sets of online monitoring data.

[0007] Step 2: Compare the monthly offline data of the online monitoring device based on whether the online monitoring device has a "pending" label, the monthly offline oil chromatography detection data M, and the average value of the online monitoring data D;

[0008] Step 3: Perform annual periodic calibration of the online monitoring device based on whether it has a "to be calibrated" label and the two concentrations of standard oil configured (low concentration and medium-low concentration).

[0009] Furthermore, the specific steps for removing duplicate data from the online monitoring data in step one are as follows: when the time interval between two adjacent sets of online monitoring data is less than the minimum detection cycle Tmin of the online monitoring device, these two sets of data are marked as "time duplicate"; when the detection results of all components of dissolved gas in oil in two adjacent sets of online monitoring data are exactly the same, these two sets of data are marked as "result duplicate"; for two or more consecutive sets of data marked as "result duplicate", only the first set of data with the earliest time among the identical duplicate results in each set is retained, and the remaining data are removed; after completing the removal of "result duplicate" data, if there are still... If there is data marked as "time repetition", then take the two sets of unmarked data before and after each string of consecutively marked "time repetition" data. Calculate the average value Vmin-i of each component gas dissolved in the oil in these two sets of data. Calculate the sum of the absolute values ​​W of the relative deviations between each component gas in each set of data marked as "time repetition" and the average value Vmin-i of the two sets of data before and after. Keep the set of data with the smallest W value in each string of consecutively marked "time repetition" data and discard the rest of the data. If there are two or more sets of data with the same W value, only keep the first set of data with the earliest time.

[0010] Furthermore, step two involves performing a monthly offline comparison of the online monitoring device based on whether the online monitoring device has a "pending" label, the monthly offline oil chromatography detection data M, and the average value D of the online monitoring data. This specifically includes:

[0011] Step 2.1: If the online monitoring device did not have a "Pending" label last month, compare the monthly offline oil chromatography detection data M with the average value D of the online monitoring data according to the current standard Q / GDW10536. If the measurement error meets the requirements of Table 1 (A1 level) in Q / GDW 10536, the online monitoring device is deemed qualified for that month. If the measurement error does not meet the requirements of Table 1 in Q / GDW10536, but meets the A level requirements (A2 level) in Table 2 of Q / GDW 10536, add a "Pending" label to the online monitoring device. If the measurement error does not meet the A level requirements (A2 level) in Table 2 of Q / GDW10536, add a "To be calibrated" label to the online monitoring device. The corresponding "To be calibrated" label will be removed 120 days after the date of labeling or after the equipment has been debugged, repaired, and calibrated.

[0012] Step 2.2: If the online monitoring device had a "Pending" label last month, compare the monthly offline oil chromatography data M with the average value D of the online monitoring data according to the current standard Q / GDW10536. If the measurement error meets the requirements of Table 1 (A1 level) in Q / GDW 10536, the online monitoring device is deemed qualified for that month, and the pending label from last month can be removed. If the measurement error does not meet the requirements of Table 1 in Q / GDW 10536, a "Pending Calibration" label is added to the online monitoring device. The corresponding "Pending Calibration" label will be removed 120 days after the labeling date or after the equipment has undergone debugging, maintenance, and calibration.

[0013] Step 2.3: If the online monitoring device accumulates two "to be calibrated" tags, notify the manufacturer's personnel to immediately enter the site for debugging, maintenance and calibration. If the accumulated number of "to be calibrated" tags has not reached two, continue operation.

[0014] Furthermore, in steps 2.1 and 2.2, the corresponding "to be calibrated" label is removed 120 days after the labeling date or after the equipment has undergone debugging, maintenance and calibration. The debugging, maintenance and calibration work includes two situations: notifying the manufacturer's personnel to immediately enter the site for debugging, maintenance and calibration during monthly offline comparison, and debugging, maintenance and calibration during annual periodic verification.

[0015] Furthermore,

[0016] Furthermore, step three involves conducting annual periodic calibration of the online monitoring device based on whether it has a "to be calibrated" label and the availability of two standard oils at low / low-medium concentrations. This specifically includes:

[0017] Step 3.1: If the online monitoring device has no "to be calibrated" labels and the concentration of dissolved acetylene gas in the main oil of the UHV oil-filled equipment monitored by the online monitoring device is >0.2μL / L, then the online monitoring device does not need to be compared with the standard oil and the periodic calibration is qualified.

[0018] Step 3.2: If the online monitoring device has no "to be calibrated" labels, but the concentration of dissolved acetylene gas in the main oil of the UHV oil-filled equipment monitored by the online monitoring device is ≤0.2μL / L, then a standard oil of one lower concentration needs to be prepared according to Table B.1 in the current standard Q / GDW10536. The standard oil should be compared with Appendix B "On-site Verification Method for Online Monitoring Devices of Dissolved Gases in Transformer Oil" in the current standard Q / GDW 10536. If the standard oil comparison result is qualified, the online monitoring device is qualified for periodic verification. If the standard oil comparison result is unqualified, the manufacturer's personnel should be notified to debug, repair and calibrate the online monitoring device.

[0019] Step 3.3: If the online monitoring device has accumulated "to be calibrated" tags, notify the manufacturer's personnel to debug, repair, and calibrate the online monitoring device;

[0020] Step 3.4: For online monitoring devices that have undergone debugging, maintenance, and calibration, prepare two standard oils of low concentration and medium-low concentration according to Table B.1 in the current standard Q / GDW 10536. Compare the standard oils with the standard oils according to Appendix B "On-site Verification Method for Online Monitoring Devices of Dissolved Gases in Transformer Oil" in the current standard Q / GDW 10536. If the standard oil comparison result is qualified, the periodic verification of the online monitoring device is qualified. If the standard oil comparison result is unqualified, the periodic verification of the online monitoring device is unqualified.

[0021] The advantages of this invention are:

[0022] 1. This invention makes full use of the monthly offline chromatographic data of ultra-high pressure and extra-high pressure oil-filled main equipment to carry out monthly offline comparison of online monitoring devices, shortening the comparison cycle from once a year to once a month. This invention can detect online monitoring devices with unqualified measurement accuracy earlier and promptly notify the manufacturer's personnel to come to the site for debugging, maintenance and calibration.

[0023] 2. This invention can also be used to optimize the annual periodic calibration workflow. When the monthly offline comparison results are qualified, the online monitoring device does not need to carry out annual periodic calibration, or only needs to be configured with a standard oil of a certain concentration for standard oil comparison, which greatly reduces the workload of annual periodic calibration. Attached Figure Description

[0024] Figure 1 The flowchart shows the verification method of the online oil chromatography monitoring device based on the comparison of insulating oil in ultra-high voltage oil-filled main equipment according to the present invention.

[0025] Figure 2 This is a schematic diagram of duplicate data removal in this invention;

[0026] Figure 3This is a schematic diagram of the tag status of the online monitoring device for annual periodic verification in this invention. Detailed Implementation

[0027] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings.

[0028] like Figure 1 As shown, this embodiment of the invention provides a calibration method for an online oil chromatography monitoring device based on the comparison of insulating oil in ultra-high voltage oil-filled main equipment, comprising the following steps:

[0029] Step (A) involves entering the monthly offline oil chromatography data M of the insulating oil in the UHV main equipment and the corresponding oil sampling time T into the data processing platform. Duplicate data in the online monitoring data are removed using the following method: the time interval between two adjacent sets of online monitoring data is less than the minimum detection cycle T of the online monitoring device. min When two sets of data are identical, they are marked as "time duplicates". When two adjacent sets of online monitoring data show identical results for all components of dissolved gas in oil, they are marked as "result duplicates". For two or more consecutive sets of data marked as "result duplicates", only the first set of data with the earliest time among the identical duplicate results is retained, and the rest of the data is discarded. After removing the "result duplicates", if there are still data marked as "time duplicates", then take the two sets of unmarked data before and after each string of consecutively marked "time duplicates" data, and calculate the average value V of each component of dissolved gas in oil in these two sets of data. min-i Calculate the average value V of each gas component in each group of data marked as "time repetition" in the string, and the average value V between the preceding and following groups. min-i The sum of the absolute values ​​of the relative deviations between them, W; retain the set of data with the smallest W value in each string that is continuously marked as "time repetition", and remove the rest of the data. If there are two or more sets of data with the same W value, only the first set of data with the earliest time is retained.

[0030] Specifically, Figure 2 This is a comparison chart of online monitoring data from an online monitoring device before and after data removal within a certain period of time. According to an embodiment of the present invention, two sets of "time duplicates" and two sets of "result duplicates" of data were effectively removed.

[0031] After removing duplicate data, collect the online monitoring data closest to the oil sampling time T, along with the two sets of online monitoring data before and after it, for a total of 5 sets of data. Calculate the average value D of the 5 sets of online monitoring data.

[0032] (1) Monthly offline comparison of online monitoring devices

[0033] Step (B): If the online monitoring device did not have a "Pending" label last month (a "Pending" label indicates that the device may require calibration, awaiting calibration results next month; the decision on whether calibration is necessary is pending), compare the monthly offline oil chromatography detection data M with the average value D of the online monitoring data according to the current standard Q / GDW 10536. If the measurement error meets the requirements of Table 1 (A1 level) in Q / GDW 10536, the online monitoring device is deemed qualified for that month; if the measurement error does not meet the requirements of Table 1 in Q / GDW 10536, but meets the A level requirements (A2 level) in Table 2 of Q / GDW 10536, add a "Pending" label to the online monitoring device; if the measurement error does not meet the requirements of Q / GDW 10536, the device is deemed qualified for that month. For the Class A requirement (Class A2) in Table 2 of 10536, an "Under Calibration" label will be added to the online monitoring device. To avoid a reduction in the measurement rating due to occasional offline testing inaccuracies by the test personnel, the corresponding "Under Calibration" label will be removed 120 days after the labeling date. After the equipment has completed commissioning, maintenance and calibration, all accumulated "Under Calibration" labels for the equipment will be removed.

[0034] Step (C): If the online monitoring device had a "pending" label last month, compare the monthly offline oil chromatography detection data M with the average value D of the online monitoring data according to the current standard Q / GDW10536. If the measurement error meets the requirements of Table 1 (A1 level) in Q / GDW 10536, the online monitoring device is deemed qualified for that month, and the "pending" label from the previous month can be removed. If the measurement error does not meet the requirements of Table 1 in Q / GDW 10536, a "pending calibration" label is added to the online monitoring device. To avoid a reduction in the measurement rating due to occasional offline detection inaccuracies by the test personnel, the corresponding "pending calibration" label is removed 120 days after the labeling date. After the equipment has completed commissioning, maintenance, and calibration, all accumulated "pending calibration" labels for the equipment are removed.

[0035] Step (D): If the online monitoring device accumulates two "to be calibrated" tags, notify the manufacturer's personnel to immediately enter the station for debugging, maintenance and calibration. If the accumulated number of "to be calibrated" tags has not reached two, continue operation.

[0036] (2) Annual periodic calibration of online monitoring devices

[0037] Step (E) If the online monitoring device has no “to be calibrated” labels and the concentration of dissolved acetylene gas in the main oil of the UHV oil-filled equipment monitored by the online monitoring device is >0.2μL / L, then the online monitoring device does not need to be compared with the standard oil and the periodic calibration is qualified.

[0038] Step (F): If the online monitoring device has no "to be calibrated" labels, but the concentration of dissolved acetylene gas in the main oil of the UHV oil-filled equipment monitored by the online monitoring device is ≤0.2μL / L, then a standard oil of one lower concentration needs to be prepared according to Table B.1 in the current standard Q / GDW10536. The standard oil should be compared with Appendix B "On-site Verification Method for Online Monitoring Devices of Dissolved Gases in Transformer Oil" in the current standard Q / GDW 10536. If the standard oil comparison result is qualified, the online monitoring device is qualified for periodic verification. If the standard oil comparison result is unqualified, the manufacturer's personnel should be notified to debug, repair and calibrate the online monitoring device.

[0039] Step (G): If the online monitoring device has accumulated "to be calibrated" labels, notify the manufacturer's personnel to first debug, repair and calibrate the online monitoring device before proceeding to the next step of standard oil comparison.

[0040] Specifically, Figure 3 To determine the label status of all online monitoring devices at a certain UHV converter station before conducting periodic calibration and the required online monitoring devices for standard oil comparison, this patented method only requires comparison of four online monitoring devices with standard oil of both low and medium-low concentrations, and comparison of ten online monitoring devices with standard oil of only low concentration. However, according to the current standard Q / GDW 10536, all 24 online monitoring devices must be compared with standard oil of both low and medium-low concentrations.

[0041] In addition, according to the current standard Q / GDW 10536, after comparing the online monitoring devices of all stations with standard oil at both low and medium-low concentrations, the devices that fail the comparison are then debugged, repaired, and calibrated based on the comparison results. After calibration, the standard oil needs to be reconfigured and compared again, which greatly increases the workload. This invention, through monthly offline comparison results, identifies online monitoring devices that need debugging, repair, and calibration in advance, allowing them to be debugged, repaired, and calibrated first, and then the standard oil comparison is performed, greatly simplifying the workflow.

[0042] Step (H) involves preparing two standard oils of low concentration and medium-low concentration according to Table B.1 in the current standard Q / GDW 10536 for the online monitoring device that has undergone commissioning, maintenance and calibration. The standard oils are then compared with those in Appendix B of the current standard Q / GDW 10536, “On-site Verification Method for Online Monitoring Devices of Dissolved Gases in Transformer Oil”. If the comparison result is qualified, the online monitoring device is qualified for periodic verification. If the comparison result is unqualified, the online monitoring device is unqualified for periodic verification.

[0043] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for calibrating an on-line oil chromatographic monitoring device based on the comparison of the insulating oil of an ultra-high voltage oil-filled main device, characterized in that: Comprising the following steps, Step one, the monthly offline oil chromatographic detection data M of the ultra-high voltage oil-filled main equipment insulation oil and the corresponding oil taking time T are input into the data processing platform, after the repeated data in the online monitoring data is removed, the average value D of the five groups of online monitoring data closest to the oil taking time T and the two groups of online monitoring data before and after it are calculated; Step two, according to whether the online monitoring device has a "to be determined" label, the monthly offline oil chromatographic detection data M and the average value D of the online monitoring data, the monthly offline comparison of the online monitoring device is carried out; Step three, according to whether the online monitoring device has a "to be calibrated" label, and the standard oil of two concentrations of low concentration / medium-low concentration configured, the annual periodic verification of the online monitoring device is carried out; The specific steps of removing repeated data in the online monitoring data in step one are as follows: when the time interval of adjacent two groups of online monitoring data is less than the minimum detection period Tmin of the online monitoring device, mark the two groups of data as "time repetition"; when the detection results of the total components of the dissolved gas in the oil of adjacent two groups of online monitoring data are completely the same, mark the two groups of data as "result repetition"; for two or more consecutive groups of data marked as "result repetition", only keep the first group of data with the earliest time in each group of the same repeated results, and remove the remaining data; after removing the "result repetition" data, if there is still data marked as "time repetition", take the two groups of data before and after each string of data continuously marked as "time repetition" without any mark, calculate the average value Vmin-i of each component gas dissolved in the oil of the two groups of data, calculate the sum W of the absolute values of the relative deviations between each component gas of the data marked as "time repetition" in each string and the average value Vmin-i of the two groups of data before and after, and keep the group of data with the minimum W value in each string of data continuously marked as "time repetition", and remove the remaining data, if there are two or more groups of data with the same W value, only keep the first group of data with the earliest time; The step two carries out the monthly offline comparison of the online monitoring device according to whether the online monitoring device has a "to be determined" label, the monthly offline oil chromatographic detection data M and the average value D of the online monitoring data, and specifically includes: Step 2.1, if there is no "to be determined" label on the online monitoring device last month, compare the monthly offline oil chromatographic detection data M with the average value D of the online monitoring data according to the current standard Q / GDW 10536, if the measurement error meets the requirements of table 1 in Q / GDW 10536 (A1 level), the online monitoring device is determined to be qualified this month; if the measurement error does not meet the requirements of table 1 in Q / GDW 10536, but meets the A level requirements of table 2 in Q / GDW 10536 (A2 level), add a "to be determined" label to the online monitoring device; if the measurement error does not meet the A level requirements of table 2 in Q / GDW 10536 (A2 level), add a "to be calibrated" label to the online monitoring device, and the corresponding "to be calibrated" label is removed after 120 days from the date of labeling or after the equipment is debugged, maintained and calibrated; Step 2.2, if the online monitoring device has a "to be determined" label for the previous month, compare the monthly offline oil chromatographic detection data M with the average value D of the online monitoring data according to the current standard Q / GDW 10536. If the measurement error meets the requirements of Table 1 in Q / GDW 10536 (A1 level), the online monitoring device for this month is determined to be qualified, and the "to be determined" label of the previous month can be cleared. If the measurement error does not meet the requirements of Table 1 in Q / GDW 10536, add a "to be calibrated" label to the online monitoring device, and the corresponding "to be calibrated" label is cleared after 120 days from the date of labeling or after the device has been debugged, repaired and calibrated. Step 2.3, if the online monitoring device accumulates two "to be calibrated" labels, notify the manufacturer to immediately enter the station for debugging, repair and calibration. If the cumulative number of "to be calibrated" labels does not reach two, continue to operate. The step three is to perform annual periodic verification of the online monitoring device according to whether the online monitoring device has a "to be calibrated" label and whether the low concentration / medium-low concentration two concentrations of standard oil are configured. Specifically, it includes: Step 3.1, if the online monitoring device accumulates no "to be calibrated" label, and the dissolved acetylene gas concentration in the oil of the ultra-high voltage oil-filled main equipment monitored by the online monitoring device is greater than 0.2 μL / L, the online monitoring device does not need to be calibrated by standard oil, and the periodic verification is qualified. Step 3.2, if the online monitoring device accumulates no "to be calibrated" label, but the dissolved acetylene gas concentration in the oil of the ultra-high voltage oil-filled main equipment monitored by the online monitoring device is less than or equal to 0.2 μL / L, a low concentration of standard oil is configured according to Table B.1 in the current standard Q / GDW 10536, and the standard oil is compared according to the Appendix B "Field Calibration Method of On-line Monitoring Device for Dissolved Gas in Transformer Oil" in the current standard Q / GDW 10536. If the standard oil comparison result is qualified, the online monitoring device is qualified for periodic verification. If the standard oil comparison result is unqualified, notify the manufacturer to debug, repair and calibrate the online monitoring device. Step 3.3, if the online monitoring device accumulates a "to be calibrated" label, notify the manufacturer to debug, repair and calibrate the online monitoring device. Step 3.4, for the online monitoring device that has been debugged, repaired and calibrated, configure low concentration / medium-low concentration two concentrations of standard oil according to Table B.1 in the current standard Q / GDW 10536, and compare the standard oil according to the Appendix B "Field Calibration Method of On-line Monitoring Device for Dissolved Gas in Transformer Oil" in the current standard Q / GDW 10536. If the standard oil comparison result is qualified, the online monitoring device is qualified for periodic verification. If the standard oil comparison result is unqualified, the online monitoring device is unqualified for periodic verification.

2. The method according to claim 1, wherein the method is characterized by: In steps 2.1 and 2.2, the corresponding "to be calibrated" label is cleared after 120 days from the date of labeling or after the device has been debugged, repaired and calibrated. The debugging, repair and calibration work includes two cases of notifying the manufacturer to immediately enter the station for debugging, repair and calibration in the monthly offline comparison, and debugging, repair and calibration in the annual periodic verification.

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