Converter transformer operation and maintenance method and system based on online monitoring data abnormity

Abstract

The invention relates to the technical field of converter transformer operation and maintenance, and discloses a converter transformer operation and maintenance method and system based on online monitoring data anomalies, and the method comprises the steps: obtaining online monitoring data of a converter transformer, the online monitoring data comprising oil chromatography gas data and monitoring data obtained by an online sensor; carrying out pre-judgment by using oil chromatography gas data, and evaluating the running state of the transformer by combining monitoring data of an online sensor under the condition of oil chromatography abnormality; and according to the obtained evaluation result, determining the operation and maintenance strategy of the converter transformer with the abnormal oil chromatogram in different operation states. According to the method, the operation state of the converter transformer can be evaluated more comprehensively, the operation and maintenance strategy of the converter transformer under the abnormal condition of the oil chromatography is optimized and improved, and the accurate evaluation capability of the operation state of the converter transformer can be improved, so that potential faults are effectively prevented, and the safe and stable operation capability of equipment is improved.

Description

Technical Field

[0001] The present application relates to the technical field of converter transformer operation and maintenance, and in particular to a converter transformer operation and maintenance method and system based on online monitoring data anomalies. Background Art

[0002] As one of the core equipment of the power system, the health status of the power transformer is closely related to the safe operation of the power system. During the long-term operation of the transformer, it is affected by many factors such as chemical stress, thermal stress, electrical stress and mechanical stress, and various failures are inevitable.

[0003] At present, many researchers at home and abroad have studied oil chromatography data from various angles. The analysis and prediction of oil chromatography gas data of converter transformers, the mining of small changes in state quantities and their development laws over time, the understanding of its internal latent defects, and the prediction of defects or fault properties have been applied in the field of converter transformer state evaluation. However, the operating environment of converter transformers is complex and has many parameters. Relying only on oil chromatography cannot fully reflect the operating status of the transformer.

[0004] Therefore, how to comprehensively and accurately evaluate the operating status of the transformer is an urgent problem to be solved. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention proposes a converter transformer operation and maintenance method and system based on online monitoring data anomalies. Combined with the online monitoring quantity, a comprehensive status evaluation of the converter transformer is performed and the operation and maintenance strategy is optimized. The status of the converter transformer can be evaluated more comprehensively, and data analysis and prediction can be performed more systematically, thereby improving the ability to accurately evaluate the operating status of the converter transformer.

[0006] The present invention adopts the following technical solution.

[0007] A first aspect of the present invention provides a converter transformer operation and maintenance method based on abnormal online monitoring data, comprising: obtaining online monitoring data of the converter transformer, the online monitoring data including oil chromatogram gas data and monitoring data obtained by online sensors; using the oil chromatogram gas data for prejudgment, and evaluating the transformer operating status in combination with the monitoring data of the online sensor when the oil chromatogram is abnormal; and determining the converter transformer operation and maintenance strategy for oil chromatogram abnormalities under different operating conditions based on the evaluation results obtained.

[0008] Preferably, the monitoring data obtained by the online sensor includes CO content, CO2 content, core fundamental ground current, clamp fundamental ground current, bushing dielectric loss, bushing capacitance, bushing leakage current, valve side bushing SF6 gas pressure, oil tank image data, submersible pump motor current, control system monitoring data, power supply system monitoring data, oil level gauge monitoring data, PT100 temperature, motor current, pressure relief valve action monitoring data, and pressure relay action monitoring data.

[0009] Preferably, the oil chromatogram gas data includes H2 content, CH4 content, C2H6 content, C2H4 content, and C2H2 content. Predicting using the oil chromatogram gas data includes:

[0010] In the case where C2H2 / C2H4<0.1 and 0.1≤CH4 / H2<1 and C2H4 / C2H6<1, or,

[0011] When C2H2 / C2H4<0.1 and CH4 / H2≥1 and C2H4 / C2H6<1, the fault type of the converter transformer is determined to be low temperature overheating;

[0012] In the case where C2H2 / C2H4<0.1 and CH4 / H2≥1 and 1≤C2H4 / C2H6<3, or,

[0013] When C2H2 / C2H4<0.1 and C2H4 / C2H6≥3, the fault type of the converter transformer is determined to be medium-high temperature overheating;

[0014] When C2H2 / C2H4<0.1, CH4 / H2<0.1 and C2H4 / C2H6<1, the fault type of the converter transformer is determined to be partial discharge;

[0015] In the case of C2H2 / C2H4≥3, the fault type of the converter transformer is determined to be low-energy discharge;

[0016] When 0.1≤C2H2 / C2H4<3, the fault type of the converter transformer is determined to be arc discharge;

[0017] When the fault type of the converter transformer is low-temperature overheating, medium-high temperature overheating, low-energy discharge, or arc discharge, the predicted result is abnormal oil chromatography.

[0018] Preferably, the operating states of the converter transformer include normal operating state, attention-required operating state, and abnormal operating state. Evaluating the operating state of the transformer in the case of abnormal oil chromatography in combination with the monitoring data of the on-line sensors includes: if the on-line monitoring data meet the first condition, determining that the operating state of the converter transformer is the normal operating state; if the on-line monitoring data meet the second condition, determining that the operating state of the converter transformer is the attention-required operating state; if the on-line monitoring data meet the third condition, determining that the operating state of the converter transformer is the abnormal operating state.

[0019] Preferably, the first condition includes that each oil chromatography monitoring data is less than or equal to the corresponding first attention value.

[0020] Preferably, the oil chromatography monitoring data include the content of C2H2, the content of H2, the total hydrocarbon content, the weekly increment of C2H2, the weekly increment of H2, the weekly increment of total hydrocarbons, and the relative growth rate of total hydrocarbons. The total hydrocarbon content is the sum of the contents of C2H2, C2H4, CH4, and C2H6. The second condition includes:

[0021] The fault type of the converter transformer is low-temperature overheating and each oil chromatography monitoring data is greater than the corresponding first attention value and does not exceed the corresponding second attention value; the fault type of the converter transformer is medium-high temperature overheating and each oil chromatography monitoring data is greater than the corresponding second attention value and does not exceed the corresponding alarm value; the fault type of the converter transformer is partial discharge and the first attention value of C2H2 < the content of C2H2 ≤ the second attention value of C2H2; the fault type of the converter transformer is low-energy discharge and the first attention value of C2H2 < the content of C2H2 ≤ the outage value of C2H2; the fault type of the converter transformer is arc discharge and the first attention value of C2H2 < the content of C2H2 ≤ the outage value of C2H2; the fundamental frequency grounding current of the iron core > the first current threshold; the fundamental frequency grounding current of the clamping piece > the second current threshold; the on-line dielectric loss of the bushing monitored on-line > the dielectric loss threshold, the on-line capacitance of the bushing > the capacitance threshold; the on-line leakage current of the bushing > the leakage current threshold; the SF6 gas pressure monitored on-line in the valve-side bushing < the SF6 gas pressure attention value; the image defect recognition finds traces of oil leakage; the current of the submersible pump motor abnormally increases and the content of C2H2 > the first attention value of C2H2; the control system is abnormal; the power supply system is abnormal; the oil level gauge shows abnormal oil level; the PT100 temperature > the temperature attention value and the hydrogen content > the hydrogen threshold; the content of C2H2 > the third attention value of C2H2; the motor current > the current attention value; the pressure relief valve operates and the pressure relay operates, one or more of them.

[0022] Preferably, the third condition includes: the converter transformer fault type is medium-high temperature overheating and the C2H2 alarm value is <C2H2 content <C2H2 shutdown value, the converter transformer fault type is medium-high temperature overheating and the C2H2 weekly increment alarm value is <C2H2 weekly increment <C2H2 weekly increment shutdown value, the converter transformer fault type is medium-high temperature overheating and the total hydrocarbon content is greater than the total hydrocarbon shutdown value, the converter transformer fault type is low-energy discharge and the C2H2 content is greater than the C2H2 shutdown value and the converter transformer fault type is arc discharge and the C2H2 content is greater than the C2H2 shutdown value. One or more of the shutdown value.

[0023] Preferably, according to the obtained evaluation results, determining the operation and maintenance strategy of the converter transformer with abnormal oil chromatogram under different operating conditions includes:

[0024] When the fault type of the converter transformer is low temperature overheating or medium and high temperature overheating, and the oil chromatogram monitoring data do not exceed the corresponding alarm value, or,

[0025] When the fault type of the converter transformer is partial discharge, low-energy discharge or arc discharge, and the C2H2 content does not exceed the C2H2 alarm value, the transformer continues to operate and chromatographic monitoring is strengthened;

[0026] When the converter transformer fault type is medium-high temperature overheating, and the C2H2 alarm value is less than the C2H2 content ≤ the C2H2 shutdown value, or the C2H2 weekly increment alarm value is less than the C2H2 weekly increment ≤ the C2H2 weekly increment shutdown value, or the total hydrocarbon content exceeds the shutdown value, it is recommended to measure the DC resistance and perform on-site oil treatment;

[0027] When the fault type of the converter transformer is low-energy discharge or arc discharge, and the C2H2 alarm value is less than the C2H2 content and less than or equal to the C2H2 shutdown value, the transformer continues to operate and chromatographic monitoring is strengthened. It is recommended that on-site personnel stay away from abnormal equipment and adjacent interval areas.

[0028] When the converter transformer fault type is arc discharge or low-energy discharge, and the C2H2 content is greater than the shutdown value, the equipment will be shut down;

[0029] When the core fundamental wave grounding current is greater than the first current threshold or the clamp fundamental wave grounding current is greater than the second current threshold, strengthen the grounding current monitoring and carry out live grounding current measurement comparison. According to the comparison results, determine whether to install a current limiting resistor cabinet under power.

[0030] In one or more of the following situations: bushing online dielectric loss > dielectric loss threshold, bushing online capacitance > capacitance threshold, and bushing online leakage current > leakage current threshold, diagnose the converter transformer fault as bushing capacitor screen breakdown, strengthen monitoring, and replace or repair the bushing in conjunction with annual inspection;

[0031] When the SF6 gas pressure is online monitored in the valve side bushing and is lower than the attention value of the SF6 gas pressure, infrared leakage point detection is carried out;

[0032] When oil leakage traces are found by image defect recognition of the oil tank image data, it is diagnosed that the pressure failure of the converter transformer is oil leakage from the oil tank, and the monitoring is strengthened;

[0033] When the current of the submersible oil pump motor rises abnormally and the content of C2H2 is greater than the first attention value of C2H2, it is diagnosed that the pressure failure of the converter transformer is the abnormality of the submersible oil pump, and the correlation between gas production and pump switching is checked;

[0034] When the control system or the power supply system is abnormal, it is diagnosed that the pressure failure of the converter transformer is the abnormality of the cooler, the cooling system is checked, and the oil temperature is monitored;

[0035] When the oil level gauge shows abnormal oil level, it is monitored whether there is oil leakage trace at the lower part of the conservator, and the actual oil level is confirmed to be normal by infrared temperature measurement;

[0036] When the PT100 temperature > the attention value of the temperature and the content of H2 > the hydrogen threshold value, or when the content of C2H2 > the third attention value of C2H2, the transformer continues to operate, the core lifting is strengthened for monitoring, and the core lifting is checked in combination with the annual inspection;

[0037] When the motor current > the attention value of the current, it is diagnosed that the pressure failure of the converter transformer is the jamming of the tap-changer mechanism, the transformer continues to operate, the core lifting is strengthened for monitoring, and the core lifting is checked in combination with the annual inspection;

[0038] When the pressure relief valve or the pressure relay operates, it is diagnosed that the pressure failure of the converter transformer is abnormal discharge of the switching core or abnormal secondary circuit. The tap-changer stops gear shifting, the transformer continues to operate, and the secondary circuit is checked.

[0039] Preferably, after obtaining the online monitoring data of the converter transformer, the method further includes:

[0040] Clean the online monitoring data to obtain the online monitoring data after data cleaning.

[0041] The second aspect of the present invention provides a converter transformer operation and maintenance system based on abnormal online monitoring data, including an acquisition module, an evaluation module and a determination module. Among them, the acquisition module is used to acquire the online monitoring data of the converter transformer, and the online monitoring data includes oil chromatographic gas data and monitoring data obtained by online sensors. The evaluation module is used to make a preliminary judgment using the oil chromatographic gas data and evaluate the operation state of the transformer in combination with the monitoring data of the online sensor in the case of abnormal oil chromatography. The determination module is used to determine the operation and maintenance strategies of the converter transformer with abnormal oil chromatography in different operation states according to the evaluation results.

[0042] Preferably, the operating state of the converter transformer includes a normal operating state, a caution operating state and an abnormal operating state, and the evaluation module includes: a prejudgment module, a first judgment module, a second judgment module and a third judgment module. The prejudgment module is used to use the oil chromatogram gas data for prejudgment to determine whether the oil chromatogram is abnormal. The first judgment module is used to determine whether the online monitoring data meets the first condition. If the online monitoring data meets the first condition, it is determined that the operating state of the converter transformer is a normal operating state. The second judgment module is used to determine whether the online monitoring data meets the second condition. If the online monitoring data meets the second condition, it is determined that the operating state of the converter transformer is a caution operating state. The third judgment module is used to determine whether the online monitoring data meets the third condition. If the online monitoring data meets the third condition, it is determined that the operating state of the converter transformer is an abnormal operating state.

[0043] Preferably, the oil chromatogram gas data includes at least one of the following: H2 content, CH4 content, C2H6 content, C2H4 content, C2H2 content, and the prediction module is used for:

[0044] In the case of C2H2 / C2H4<0.1 and 0.1≤CH4 / H2<1 and C2H4 / C2H6<1, or in the case of C2H2 / C2H4<0.1 and CH4 / H2≥1 and C2H4 / C2H6<1, the fault type of the converter transformer is determined to be low-temperature overheating. In the case of C2H2 / C2H4<0.1 and CH4 / H2≥1 and 1≤C2H4 / C2H6<3, or in the case of C2H2 / C2H4<0.1 and C2H4 / C2H6≥3, the fault type of the converter transformer is determined to be medium-high temperature overheating. In the case of C2H2 / C2H4<0.1 and CH4 / H2<0.1 and C2H4 / C2H6<1, the fault type of the converter transformer is determined to be partial discharge; in the case of C2H2 / C2H4≥3, the fault type of the converter transformer is determined to be low-energy discharge. When 0.1≤C2H2 / C2H4<3, the fault type of the converter transformer is determined to be arc discharge. When the fault type of the converter transformer is low temperature overheating, medium and high temperature overheating, low energy discharge or arc discharge, the prediction result is abnormal oil chromatogram.

[0045] Preferably, the first condition includes: each oil chromatogram monitoring data is less than or equal to the corresponding first attention value.

[0046] Preferably, the second condition includes: the fault type of the converter transformer is low-temperature overheating and each oil chromatogram monitoring data is greater than the corresponding first attention value and does not exceed the corresponding second attention value; the fault type of the converter transformer is medium-high temperature overheating and each oil chromatogram monitoring data is greater than the corresponding second attention value and does not exceed the corresponding alarm value; the fault type of the converter transformer is partial discharge and the first attention value of C2H2 < C2H2 content ≤ the second attention value of C2H2; the fault type of the converter transformer is low-energy discharge and the first attention value of C2H2 < C2H2 content ≤ the outage value of C2H2; the fault type of the converter transformer is arc discharge and the first attention value of C2H2 < C2H2 content ≤ the outage value of C2H2; the fundamental frequency grounding current of the iron core > the first current threshold; the fundamental frequency grounding current of the clamping parts > the second current threshold; the online dielectric loss of the bushing monitored online > the dielectric loss threshold, the online capacitance of the bushing > the capacitance threshold; the online leakage current of the bushing > the leakage current threshold; the SF6 gas pressure monitored online in the valve-side bushing < the attention value of SF6 gas pressure; the image defect recognition finds the trace of oil leakage; the current of the submerged pump motor increases abnormally and the C2H2 content > the first attention value of C2H2; the control system is abnormal; the power supply system is abnormal; the oil level indicated by the oil level gauge is abnormal; the PT100 temperature > the temperature attention value and the hydrogen content > the hydrogen threshold; the C2H2 content > the third attention value of C2H2; the motor current > the current attention value; one or more of the pressure relief valve action and the pressure relay action.

[0047] Preferably, the third condition includes: the fault type of the converter transformer is medium-high temperature overheating and the alarm value of C2H2 < C2H2 content < the outage value of C2H2; the fault type of the converter transformer is medium-high temperature overheating and the weekly increment alarm value of C2H2 < the weekly increment of C2H2 < the weekly increment outage value of C2H2; the fault type of the converter transformer is medium-high temperature overheating and the total hydrocarbon content is greater than the total hydrocarbon outage value; the fault type of the converter transformer is low-energy discharge and the C2H2 content is greater than the outage value of C2H2; and / or the fault type of the converter transformer is arc discharge and the C2H2 content is greater than the outage value of C2H2.

[0048] Preferably, the determination module includes:

[0049] The first determination module is used to determine that the operation and maintenance strategy of the converter transformer is to continue running the transformer and strengthen the chromatogram monitoring when the fault type of the converter transformer is low-temperature overheating or medium-high temperature overheating and each oil chromatogram monitoring data does not exceed the corresponding alarm value, or when the fault type of the converter transformer is partial discharge or low-energy discharge or arc discharge and the C2H2 content does not exceed the alarm value of C2H2.

[0050] A second determination module, configured to determine that the operation and maintenance strategy of the converter transformer is to recommend measuring the DC resistance and performing on-site oil treatment when the fault type of the converter transformer is medium-high temperature overheating, and the C2H2 alarm value < C2H2 content ≤ C2H2 shutdown value, or the C2H2 weekly increment alarm value < C2H2 weekly increment ≤ C2H2 weekly increment shutdown value, or the total hydrocarbon content exceeds the shutdown value.

[0051] A third determination module, configured to determine that the operation and maintenance strategy of the converter transformer is to continue operating the transformer, strengthen chromatographic monitoring, and recommend that on-site personnel stay away from the abnormal equipment and adjacent interval areas when the fault type of the converter transformer is low-energy discharge or arc discharge, and the C2H2 alarm value < C2H2 content ≤ C2H2 shutdown value.

[0052] A fourth determination module, configured to determine that the operation and maintenance strategy of the converter transformer is to shut down the equipment when the fault type of the converter transformer is arc discharge or low-energy discharge, and the C2H2 content > shutdown value.

[0053] A fifth determination module, configured to determine that the operation and maintenance strategy of the converter transformer is to strengthen the monitoring of the grounding current, conduct on-line measurement and comparison of the grounding current, and determine whether to install a current-limiting resistor cabinet live according to the comparison result when the fundamental frequency grounding current of the iron core > the first current threshold or the fundamental frequency grounding current of the clamping piece > the second current threshold.

[0054] A sixth determination module, configured to diagnose that the converter transformer pressure failure is a breakdown of the bushing capacitor screen when the on-line dielectric loss of the bushing > the dielectric loss threshold, the on-line capacitance of the bushing > the capacitance threshold, and the on-line leakage current of the bushing > the leakage current threshold, and determine that the operation and maintenance strategy of the converter transformer is to strengthen the monitoring and replace or repair the bushing in combination with the annual inspection.

[0055] A seventh determination module, configured to determine that the operation and maintenance strategy of the converter transformer is to perform infrared leak detection when the on-line monitored SF6 gas pressure in the valve-side bushing < the SF6 gas pressure attention value.

[0056] An eighth determination module, configured to diagnose that the converter transformer pressure failure is oil leakage in the oil tank when oil leakage traces are found by image defect recognition of the oil tank image data, and determine that the operation and maintenance strategy of the converter transformer is to strengthen the monitoring.

[0057] A ninth determination module, configured to diagnose that the converter transformer pressure failure is an abnormality of the submersible oil pump when the current of the submersible oil pump motor increases abnormally and the C2H2 content is greater than the first C2H2 attention value, and determine that the operation and maintenance strategy of the converter transformer is to perform a correlation check between gas production and pump switching.

[0058] The tenth determination module is used to diagnose the converter transformer fault as a cooler abnormality when the control system or the power system is abnormal, and determine the converter transformer operation and maintenance strategy as checking the cooling system and monitoring the oil temperature.

[0059] The eleventh determination module is used to monitor whether there are signs of oil leakage in the lower part of the oil storage cabinet when the oil level gauge shows an abnormal oil level, and determine whether the operation and maintenance strategy of the converter transformer is to confirm whether the actual oil level is normal through infrared temperature measurement.

[0060] The twelfth determination module is used to determine the operation and maintenance strategy of the converter transformer to continue operating the transformer, strengthen monitoring of the hanging core, and inspect the hanging core in conjunction with the annual inspection when the PT100 temperature is greater than the temperature warning value and the H2 content is greater than the hydrogen threshold, or when the C2H2 content is greater than the C2H2 third warning value.

[0061] The thirteenth determination module is used to diagnose the converter transformer fault as a stuck tap switch mechanism when the motor current is greater than the current warning value, determine the converter transformer operation and maintenance strategy as the transformer continues to operate, strengthen monitoring of the hanging core, and inspect the hanging core in conjunction with the annual inspection.

[0062] The fourteenth determination module is used to diagnose the converter transformer pressure fault as abnormal discharge of the switching core or abnormal secondary circuit when the pressure relief valve or the pressure relay is actuated, determine the converter transformer operation and maintenance strategy as suspending the shifting of the tap changer, continuing the operation of the transformer, and checking the secondary circuit.

[0063] The third aspect of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the computer program is loaded into the processor, the method for operation and maintenance of a converter transformer based on abnormal online monitoring data is implemented.

[0064] The fourth invention of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the above-mentioned method for operation and maintenance of converter transformers based on abnormal online monitoring data.

[0065] Compared with the prior art, the beneficial effects of the present invention include at least:

[0066] The present invention uses the online detection data changes during the operation of the converter transformer to monitor the health of the converter transformer. By analyzing the data such as the oil chromatogram, the possible faults and abnormal conditions inside the converter transformer are judged, all online sensors are monitored more strictly, and all existing online parameters are combined to provide a more comprehensive operation and maintenance strategy for the converter transformer under abnormal conditions, and the ability to accurately evaluate the operating status of the converter transformer can be improved, thereby effectively preventing potential faults and improving the safe and stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0068] Figure 1 It is a schematic diagram of a converter transformer operation and maintenance decision optimization process provided by the present invention;

[0069] Figure 2-1 It is a schematic diagram of an online monitoring data operation and maintenance strategy flow chart provided by the present invention;

[0070] Figure 2-2 It is a schematic diagram of a flow chart of an online monitoring data operation and maintenance strategy provided by the present invention. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0072] The existing converter transformer operation and maintenance strategy determines the nature of transformer faults based on the C2H2 / C2H4, CH4 / H2 and C2H4 / C2H6 ratios. However, the existing technology only relies on oil chromatography data for fault diagnosis and maintenance decisions, ignoring other online monitoring quantities, and cannot comprehensively and objectively evaluate the status of the converter transformer. In addition, the collection and utilization of converter transformer operation data is not high enough, and there is a lack of systematic data analysis and prediction, which limits the accurate grasp of the equipment status.

[0073] The present invention optimizes the problem that it is difficult to comprehensively and objectively evaluate and adopt correct operation and maintenance methods for converter transformers when the monitoring data is abnormal. The fault type of the converter transformer is judged based on the C2H2 / C2H4, CH4 / H2 and C2H4 / C2H6 ratios, and on this basis, the monitoring data is obtained by combining online sensors, and the changes in key gas content are monitored more closely to evaluate the operating status of the transformer. The operation and maintenance strategy of the converter transformer under abnormal oil chromatography is optimized and improved. This measure aims to improve the ability to accurately evaluate the operating status of the converter transformer, thereby effectively preventing potential failures and ensuring safe and stable operation of the equipment.

[0074] Combination Figure 1 As shown in FIG2 , the present invention provides a converter transformer operation and maintenance method based on abnormal online monitoring data, the method comprising:

[0075] Step 1: Obtain transformer online monitoring data. Online monitoring data includes oil chromatogram gas data and online sensor monitoring data.

[0076] Specifically, the monitoring data obtained by the online sensor include: CO content, CO2 content, core fundamental grounding current, clamp fundamental grounding current, bushing dielectric loss, bushing capacitance, bushing leakage current, valve side bushing SF6 gas pressure, image defect recognition to find traces of oil leakage, submersible pump motor current, control system monitoring, power supply system monitoring, oil level gauge monitoring, PT100 temperature, motor current, pressure relief valve action monitoring, and pressure relay action monitoring.

[0077] Oil chromatogram gas data include H2 (hydrogen) content, CH4 (methane) content, C2H6 (ethane) content, C2H4 (ethylene) content, and C2H2 (acetylene) content.

[0078] Step 2: Use the oil chromatogram gas data for prediction, and evaluate the transformer operating status in combination with the monitoring data of the online sensor when the oil chromatogram is abnormal.

[0079] Step 2 includes:

[0080] Step 2.1: Analyze the oil chromatogram data to obtain the converter transformer fault type.

[0081] Specifically,

[0082] In the case where C2H2 / C2H4<0.1 and 0.1≤CH4 / H2<1 and C2H4 / C2H6<1, or,

[0083] When C2H2 / C2H4<0.1 and CH4 / H2≥1 and C2H4 / C2H6<1, the fault type of the converter transformer is determined to be low temperature overheating;

[0084] In the case where C2H2 / C2H4<0.1 and CH4 / H2≥1 and 1≤C2H4 / C2H6<3, or,

[0085] When C2H2 / C2H4<0.1 and C2H4 / C2H6≥3, the fault type of the converter transformer is determined to be medium-high temperature overheating;

[0086] When C2H2 / C2H4<0.1, CH4 / H2<0.1 and C2H4 / C2H6<1, the fault type of the converter transformer is determined to be partial discharge;

[0087] In the case of C2H2 / C2H4≥3, the fault type of the converter transformer is determined to be low-energy discharge;

[0088] When 0.1≤C2H2 / C2H4<3, the fault type of the converter transformer is determined to be arc discharge.

[0089] Step 2.2: When the fault type of the converter transformer is low-temperature overheating, medium-high-temperature overheating, partial discharge, low-energy discharge, or arc discharge, the predicted result is that the oil chromatogram is abnormal.

[0090] Furthermore, the oil chromatogram gas data is gas-coded to obtain the oil chromatogram gas data coding value, and the converter transformer fault type is determined according to the oil chromatogram gas data coding value.

[0091] In a preferred but non-limiting embodiment, the oil chromatogram gas data is encoded as shown in Table 1 and Table 2. Specifically, the first bit of the oil chromatogram gas data encoding is C2H2 / C2H4 encoding, the second bit is CH4 / H2 encoding, and the third bit is C2H4 / C2H6 encoding. When C2H2 / C2H4<0.1, its code is assigned to 0; CH4 / H2<0.1, its code is assigned to 1; C2H4 / C2H6<0.1, its code is assigned to 0; when 0.1≤C2H2 / C2H4<1, its code is assigned to 1; 0.1≤CH4 / H2<1, its code is assigned to 0; 0.1≤C2H4 / C2H6<1, its code is assigned to 0; when 1≤C2H2 / C2H4<3, its code is assigned to 1; 1≤CH4 / H2<3, its code is assigned to 2; 1≤C2H4 / C2H6<3, its code is assigned to 1; when C2H2 / C2H4≥3, its code is assigned to 2; CH4 / H2≥3, its code is assigned to 2; C2H4 / C2H6≥3, its code is assigned to 2.

[0092] Table 1

[0093]

[0094]

[0095] Table 2

[0096]

[0097] As shown in Table 1 and Table 2, when the oil chromatogram gas data code is 000 or 020, the fault type of the converter transformer is determined to be low-temperature overheating; when the oil chromatogram gas data code is 021, or, when the first bit of the oil chromatogram gas data code is 0 and the third bit is 2, the fault type of the converter transformer is determined to be medium-high temperature overheating; when the oil chromatogram gas data code is 010, the fault type of the converter transformer is determined to be partial discharge; when the first bit of the oil chromatogram gas data code is 2, the fault type of the converter transformer is determined to be low-energy discharge; when the first bit of the oil chromatogram gas data code is 1, the fault type of the converter transformer is determined to be arc discharge.

[0098] It is understandable that the present invention does not limit the method for encoding the oil chromatogram data, and those skilled in the art can set the encoding according to actual needs.

[0099] Step 2.3: In the case of abnormal oil chromatography, the transformer operating status is evaluated in combination with the monitoring data of the online sensor.

[0100] Specifically, the operating status of the converter transformer includes a normal operating status, a caution operating status and an abnormal operating status.

[0101] Furthermore, if the online monitoring data meets the first condition, the operating state of the converter transformer is determined to be a normal operating state; if the online monitoring data meets the second condition, the operating state of the converter transformer is determined to be a warning operating state; if the online monitoring data meets the third condition, the operating state of the converter transformer is determined to be an abnormal operating state.

[0102] Table 3 is a preferred but non-restrictive oil chromatographic threshold for online monitoring of AC UHV transformers (high-voltage transformers).

[0103] Table 3

[0104]

[0105] As shown in Table 3, the online monitoring data include oil chromatography monitoring data, which include C2H2 content, H2 content, total hydrocarbon content, C2H2 weekly increment, H2 weekly increment, total hydrocarbon weekly increment and total hydrocarbon relative growth rate. The total hydrocarbon content is the sum of C2H2, C2H4, CH4 and C2H6 contents.

[0106] Preferably, the first condition includes: each oil chromatogram monitoring data is less than or equal to the corresponding first attention value. If the oil chromatogram online monitoring data all reach the attention value, it is preliminarily determined that the transformer is in normal operation.

[0107] Furthermore, each oil chromatogram monitoring data being less than or equal to the corresponding first attention value includes: the C2H2 content ≤ the first C2H2 attention value, and the H2 content ≤ the first H2 attention value, and the total hydrocarbon content ≤ the first total hydrocarbon attention value, and the weekly increment of C2H2 ≤ the first weekly increment attention value of C2H2, and the weekly increment of H2 ≤ the first weekly increment attention value of H2, and the weekly increment of total hydrocarbons ≤ the first weekly increment attention value of total hydrocarbons, and the relative growth rate of total hydrocarbons ≤ the first relative growth rate attention value of total hydrocarbons.

[0108] Preferably, the first C2H2 attention value is 0.5 μL / L, the first H2 attention value is 75 μL / L, the first total hydrocarbon attention value is 75 μL / L, the first weekly increment attention value of C2H2 is 0.3 μL / L, the first weekly increment attention value of H2 is 10 μL / L, the first weekly increment attention value of total hydrocarbons is 5 μL / L, and the first relative growth rate attention value of total hydrocarbons is 10 μL / L.

[0109] Preferably, the second condition includes: the converter transformer fault type is low-temperature overheating and each oil chromatogram monitoring data is greater than the corresponding first attention value and does not exceed the corresponding second attention value; the converter transformer fault type is medium-high temperature overheating and each oil chromatogram monitoring data is greater than the corresponding second attention value and does not exceed the corresponding alarm value; the converter transformer fault type is partial discharge and the first C2H2 attention value < C2H2 content ≤ the second C2H2 attention value; the converter transformer fault type is low-energy discharge and the first C2H2 attention value < C2H2 content ≤ the C2H2 shutdown value; the converter transformer fault type is arc discharge and the first C2H2 attention value < C2H2 content ≤ the C2H2 shutdown value; the fundamental frequency grounding current of the iron core > the first current threshold; the fundamental frequency grounding current of the clamping piece > the second current threshold; the online dielectric loss of the bushing monitored online > the dielectric loss threshold, the online capacitance of the bushing > the capacitance threshold; the online leakage current of the bushing > the leakage current threshold; the SF6 gas pressure monitored online in the valve-side bushing < the SF6 gas pressure attention value; the image defect recognition finds traces of oil leakage; the current of the submersible pump motor increases abnormally and the C2H2 content > the first C2H2 attention value; the control system is abnormal; the power supply system is abnormal; the oil level gauge shows abnormal oil level; the PT100 temperature > the temperature attention value and the hydrogen content > the hydrogen threshold; the C2H2 content > the third C2H2 attention value; the motor current > the current attention value; the pressure relief valve operates and the pressure relay operates, one or more of them.

[0110] Furthermore, each oil chromatogram monitoring data being greater than the corresponding first attention value and not exceeding the corresponding second attention value includes:

[0111] C2H2 first attention value < C2H2 content ≤ C2H2 second attention value, and / or, H2 first attention value < H2 content ≤ H2 second attention value, and / or, total hydrocarbon first attention value < total hydrocarbon content ≤ total hydrocarbon second attention value, and / or, C2H2 weekly increment first attention value < C2H2 weekly increment ≤ C2H2 weekly increment second attention value, and / or, H2 weekly increment first attention value < H2 weekly increment ≤ H2 weekly increment second attention value, and / or, total hydrocarbon weekly increment first attention value < total hydrocarbon weekly increment ≤ total hydrocarbon weekly increment second attention value, and / or total hydrocarbon relative growth rate first attention value < total hydrocarbon relative growth rate ≤ total hydrocarbon relative growth rate second attention value.

[0112] Furthermore, each oil chromatogram monitoring data is greater than the corresponding second attention value and does not exceed the corresponding alarm value, including:

[0113] The second attention value of C2H2 is less than or equal to the C2H2 content, and / or the second attention value of H2 is less than or equal to the H2 content, and / or the second attention value of total hydrocarbons is less than or equal to the total hydrocarbon content, and / or the second attention value of C2H2 weekly increment is less than or equal to the C2H2 weekly increment ≤ the C2H2 weekly increment alarm value, and / or the second attention value of H2 weekly increment is less than or equal to the H2 weekly increment, and / or the second attention value of total hydrocarbon weekly increment is less than or equal to the total hydrocarbon weekly increment, and / or the second attention value of total hydrocarbon relative growth rate is less than or equal to the total hydrocarbon relative growth rate.

[0114] Preferably, the first attention value of C2H2 is 0.5 μL / L, the second attention value of C2H2 is 1 μL / L, and the alarm value of C2H2 is 3 μL / L; the first attention value of H2 is 75 μL / L, the second attention value of H2 is 150 μL / L, the first attention value of total hydrocarbons is 75 μL / L, the second attention value of total hydrocarbons is 150 μL / L, the first attention value of C2H2 weekly increment is 0.3 μL / L, the second attention value of C2H2 weekly increment is 0.6 μL / L, and the alarm value of C2H2 weekly increment is 1 μL / L; the first attention value of H2 weekly increment is 10 μL / L, and the second attention value of H2 is 150 μL / L. The second attention value of weekly increment is 20μL / L, the first attention value of weekly increment of total hydrocarbons is 5μL / L, the second attention value of weekly increment of total hydrocarbons is 10μL / L, the first attention value of relative growth rate of total hydrocarbons is 10μL / L, the second attention value of relative growth rate of total hydrocarbons is 20μL / L, the first current threshold is 300mA, the second current threshold is 300mA, the dielectric loss threshold is 0.6%, the capacitance threshold is ±2%, the leakage current threshold is ±2%, the temperature attention value is 125℃, the hydrogen threshold is 100ppm, and the third attention value is 4uL / L / 1000 times.

[0115] Preferably, the third attention value is calculated according to the following formula:

[0116]

[0117] sum切换 <30000

[0118] Among them, h3 is the third attention value, the unit is uL / L, sum 切换 is the switching times of the tap changer.

[0119] It is understandable that those skilled in the art may set the above-mentioned various thresholds according to actual needs, and the present invention does not limit the settings of the above-mentioned various thresholds.

[0120] Furthermore, as shown in Table 3:

[0121] If the coding method determines that it is low temperature overheating, it is preliminarily judged that the transformer is in a state of caution operation.

[0122] If the coding method determines that it is medium or high temperature overheating, and the oil chromatogram monitoring data is greater than the corresponding attention value 1 but does not exceed the corresponding attention value 2, it is preliminarily judged that the transformer is in a caution operating state.

[0123] If the coding method determines that it is medium or high temperature overheating, and the oil chromatogram monitoring data is greater than the corresponding attention value 2 but does not exceed the alarm value, it is preliminarily judged that the transformer is in a caution operating state.

[0124] If the coding method determines that it is partial discharge, it is preliminarily judged that the transformer is in a state of caution operation.

[0125] If the coding method determines that it is a low-energy discharge, and the C2H2 content in the oil chromatography monitoring data is greater than the attention value 1 but does not exceed the attention value 2, it is preliminarily judged that the transformer is in a caution operating state.

[0126] If the coding method determines that it is a low-energy discharge, and the C2H2 content in the oil chromatography monitoring data is greater than the attention value 2 but does not exceed the alarm value, it is preliminarily judged that the transformer is in a caution operation state.

[0127] If the coding method determines that it is a low-energy discharge, and the C2H2 content in the oil chromatography monitoring data is greater than the alarm value but does not exceed the shutdown value, it is preliminarily judged that the transformer is in a state of caution operation.

[0128] If the coding method determines that it is an arc discharge, and the C2H2 content in the oil chromatography monitoring data is greater than the attention value 1 but does not exceed the attention value 2, it is preliminarily judged that the transformer is in a caution operating state.

[0129] If the coding method determines that it is an arc discharge, and the C2H2 content in the oil chromatography monitoring data is greater than the attention value 2 but does not exceed the alarm value, it is preliminarily judged that the transformer is in a caution operating state.

[0130] If the coding method determines that it is an arc discharge, and the C2H2 content in the oil chromatography monitoring data is greater than the alarm value but does not exceed the shutdown value, it is preliminarily judged that the transformer is in a state of caution operation.

[0131] If the core fundamental wave grounding current > 300mA or the clamp fundamental wave grounding current > 300mA, it is preliminarily judged that the transformer is in the caution operation state.

[0132] If online monitoring detects one or more of the following symptoms: bushing online dielectric loss > 0.6%, bushing online capacitance > ±2%, bushing online leakage current > ±2%, it is preliminarily judged that the transformer is in a state of caution.

[0133] If the SF6 gas pressure monitored online in the valve-side bushing is less than the gas pressure warning value (the threshold is set according to the actual situation of each manufacturer), it is preliminarily judged that the transformer is in a warning operation state.

[0134] If the image defect recognition finds signs of oil leakage, it is preliminarily judged that the transformer is in a state of caution.

[0135] If the submersible pump motor current increases abnormally and the C2H2 content is greater than the caution value 1, it is preliminarily judged that the transformer is in a caution operating state.

[0136] If the control system or power supply system is abnormal, it is preliminarily judged that the transformer is in the state of caution operation.

[0137] If the oil level gauge shows an abnormal oil level, it is preliminarily judged that the transformer is in a state of caution.

[0138] If the PT100 temperature is greater than the temperature warning value (125°C) and the hydrogen content is greater than 100ppm, it is preliminarily judged that the transformer is in a warning operating state.

[0139] If the C2H2 content is greater than the third caution value, it is preliminarily determined that the transformer is in a caution operating state.

[0140] If the motor current > the current caution value, it is preliminarily judged that the transformer is in the caution operation state.

[0141] If the pressure relief valve or pressure relay is activated, it can be preliminarily judged that the transformer is in the caution operation state.

[0142] Preferably, the third condition includes: the converter transformer fault type is medium-high temperature overheating and the C2H2 alarm value is <C2H2 content <C2H2 shutdown value, the converter transformer fault type is medium-high temperature overheating and the C2H2 weekly increment alarm value is <C2H2 weekly increment <C2H2 weekly increment shutdown value, the converter transformer fault type is medium-high temperature overheating and the total hydrocarbon content is greater than the total hydrocarbon shutdown value, the converter transformer fault type is low-energy discharge and the C2H2 content is greater than the C2H2 shutdown value and the converter transformer fault type is arc discharge and the C2H2 content is greater than the C2H2 shutdown value. One or more of the shutdown value.

[0143] Preferably, the C2H2 alarm value is 3 μL / L, the C2H2 shutdown value is 5 μL / L, the C2H2 weekly incremental alarm value is 1 μL / L, the C2H2 weekly incremental shutdown value is 1.5 μL / L every 2 hours, and the total hydrocarbon shutdown value is 450 μL / L.

[0144] More specifically,

[0145] If the coding method determines that it is medium or high temperature overheating, and the acetylene content or acetylene growth rate in the oil chromatogram monitoring data is greater than the alarm value but does not exceed the shutdown value, it is preliminarily judged that the transformer is in an abnormal operating state.

[0146] If the coding method determines that it is medium or high temperature overheating, and the total hydrocarbon content in the oil chromatogram monitoring data exceeds the shutdown value, it is preliminarily judged that the transformer is in an abnormal operating state.

[0147] If the coding method determines that it is a low-energy discharge and the C2H2 content in the oil chromatography monitoring data is greater than the shutdown value, it is preliminarily judged that the transformer is in an abnormal operating state.

[0148] If the coding method determines that it is an arc discharge and the C2H2 content in the oil chromatography monitoring data is greater than the shutdown value, it is preliminarily judged that the transformer is in an abnormal operating state.

[0149] Step 3: According to the evaluation results obtained, determine the operation and maintenance strategy of the converter transformer with abnormal oil color spectrum under different operating conditions.

[0150] Based on steps 1 and 2, determine the treatment methods for oil chromatographic abnormalities under different operating conditions, and put forward suggestions for transformer operation and maintenance.

[0151] Step 3 includes:

[0152] When the fault type of the converter transformer is low-temperature overheating or medium-high-temperature overheating, and the oil chromatography monitoring data do not exceed the corresponding alarm value, or when the fault type of the converter transformer is local discharge, low-energy discharge or arc discharge, and the C2H2 content does not exceed the C2H2 alarm value, the transformer continues to operate and strengthens chromatography monitoring.

[0153] When the converter transformer fault type is medium-high temperature overheating, and the C2H2 alarm value is <C2H2 content ≤C2H2 shutdown value or the C2H2 weekly increment alarm value is <C2H2 weekly increment ≤C2H2 weekly increment shutdown value or the total hydrocarbon content exceeds the shutdown value, it is recommended to measure the DC resistance and perform on-site oil treatment.

[0154] When the converter transformer fault type is low-energy discharge or arc discharge, and the C2H2 alarm value is <C2H2 content ≤C2H2 shutdown value, the transformer continues to operate and chromatographic monitoring is strengthened. It is recommended that on-site personnel stay away from abnormal equipment and adjacent interval areas.

[0155] When the converter transformer fault type is arc discharge or low-energy discharge, and the C2H2 content is greater than the shutdown value, the equipment will be shut down.

[0156] When the fundamental wave grounding current of the core is >300mA or the fundamental wave grounding current of the clamp is >300mA, strengthen the grounding current monitoring, and carry out live grounding current measurement and comparison. Determine whether to install a current limiting resistor cabinet based on the comparison results.

[0157] In one or more of the following cases: bushing online dielectric loss > 0.6%, bushing online capacitance > ±2%, and bushing online leakage current > ±2%, the converter transformer fault is diagnosed as bushing capacitor screen breakdown, and monitoring is strengthened, and the bushing is replaced or repaired in conjunction with annual inspection.

[0158] When the online monitoring shows that the SF6 gas pressure in the valve side bushing is less than the gas pressure warning value, infrared leakage detection is performed.

[0159] When traces of oil leakage are found through image defect recognition of the fuel tank image data, the converter transformer fault is diagnosed as oil leakage in the fuel tank, and monitoring is strengthened.

[0160] When the submersible pump motor current increases abnormally and the C2H2 content is greater than the first attention value of C2H2, the converter transformer fault is diagnosed as a submersible pump abnormality, and the correlation between gas production and oil pump switching is checked.

[0161] In case of abnormality in the control system or power system, diagnose the converter transformer fault as a cooler abnormality, check the cooling system, and monitor the oil temperature.

[0162] When the oil level gauge shows an abnormal oil level, monitor the lower part of the oil storage tank for signs of oil leakage and confirm whether the actual oil level is normal through infrared temperature measurement.

[0163] When the PT100 temperature is greater than the temperature warning value and the H2 content is greater than 100ppm, or when the C2H2 content is greater than the C2H2 third warning value, the transformer continues to operate, the hanging core is monitored more closely, and the hanging core is inspected in conjunction with the annual inspection.

[0164] When the motor current is greater than the current warning value, the commutation transformer fault is diagnosed as a stuck tap changer mechanism. The transformer continues to operate, and the hanging core is monitored more closely and inspected in conjunction with the annual inspection.

[0165] When the pressure relief valve or pressure relay is actuated, the transformer pressure fault is diagnosed as abnormal discharge of the switching core or abnormal secondary circuit. The tap changer is suspended, the transformer continues to operate, and the secondary circuit is checked.

[0166] Preferably, before step 2, the method further comprises: performing data cleaning on the online monitoring data to obtain the online monitoring data after data cleaning.

[0167] Specifically, the invalid data contained therein is cleaned, such as negative values, NaN and other non-valid data. Subsequently, appropriate methods should be adopted to interpolate the missing values ​​in the data, including but not limited to K-nearest neighbor method, random forest algorithm, recurrent neural network and other algorithms. In this way, the effectiveness and accuracy of online monitoring data can be improved, thereby improving the accuracy of converter transformer operation and maintenance strategy.

[0168] Embodiment 2 of the present invention provides a converter transformer operation and maintenance system based on abnormal online monitoring data, which runs the method described in Embodiment 1, and the system includes: an acquisition module, an evaluation module, and a determination module. Among them, the acquisition module is used to acquire the online monitoring data of the converter transformer, and the online monitoring data includes oil chromatogram gas data and monitoring data obtained by online sensors. The evaluation module is used to use the oil chromatogram gas data for prejudgment, and evaluate the transformer operating status in combination with the monitoring data of the online sensor when the oil chromatogram is abnormal. The determination module is used to determine the converter transformer operation and maintenance strategy for oil chromatogram abnormalities under different operating conditions based on the evaluation results.

[0169] Preferably, the operating state of the converter transformer includes a normal operating state, a caution operating state and an abnormal operating state, and the evaluation module includes: a prejudgment module, a first judgment module, a second judgment module and a third judgment module. The prejudgment module is used to use the oil chromatogram gas data for prejudgment to determine whether the oil chromatogram is abnormal. The first judgment module is used to determine whether the online monitoring data meets the first condition. If the online monitoring data meets the first condition, it is determined that the operating state of the converter transformer is a normal operating state. The second judgment module is used to determine whether the online monitoring data meets the second condition. If the online monitoring data meets the second condition, it is determined that the operating state of the converter transformer is a caution operating state. The third judgment module is used to determine whether the online monitoring data meets the third condition. If the online monitoring data meets the third condition, it is determined that the operating state of the converter transformer is an abnormal operating state.

[0170] Preferably, the oil chromatogram gas data includes at least one of the following: H2 content, CH4 content, C2H6 content, C2H4 content, C2H2 content, and the prediction module is used for:

[0171] When C2H2 / C2H4 < 0.1 and 0.1 ≤ CH4 / H2 < 1 and C2H4 / C2H6 < 1, or when C2H2 / C2H4 < 0.1 and CH4 / H2 ≥ 1 and C2H4 / C2H6 < 1, determine that the fault type of the converter transformer is low-temperature overheating. When C2H2 / C2H4 < 0.1 and CH4 / H2 ≥ 1 and 1 ≤ C2H4 / C2H6 < 3, or when C2H2 / C2H4 < 0.1 and C2H4 / C2H6 ≥ 3, determine that the fault type of the converter transformer is medium-high temperature overheating. When C2H2 / C2H4 < 0.1 and CH4 / H2 < 0.1 and C2H4 / C2H6 < 1, determine that the fault type of the converter transformer is partial discharge; when C2H2 / C2H4 ≥ 3, determine that the fault type of the converter transformer is low-energy discharge. When 0.1 ≤ C2H2 / C2H4 < 3, determine that the fault type of the converter transformer is arc discharge. When the fault type of the converter transformer is low-temperature overheating or medium-high temperature overheating or low-energy discharge or arc discharge, the prediction result is abnormal oil chromatography.

[0172] Preferably, the first condition includes that each oil chromatography monitoring data is less than or equal to the corresponding first attention value.

[0173] Preferably, the second condition includes that the fault type of the converter transformer is low-temperature overheating and each oil chromatography monitoring data is greater than the corresponding first attention value and does not exceed the corresponding second attention value, the fault type of the converter transformer is medium-high temperature overheating and each oil chromatography monitoring data is greater than the corresponding second attention value and does not exceed the corresponding alarm value, the fault type of the converter transformer is partial discharge and C2H2 first attention value < C2H2 content ≤ C2H2 second attention value, the fault type of the converter transformer is low-energy discharge and C2H2 first attention value < C2H2 content ≤ C2H2 outage value, the fault type of the converter transformer is arc discharge and C2H2 first attention value < C2H2 content ≤ C2H2 outage value, the fundamental wave grounding current of the iron core > the first current threshold, the fundamental wave grounding current of the clamp > the second current threshold, the on-line monitored dielectric loss of the bushing > the dielectric loss threshold, the on-line capacitance of the bushing > the capacitance threshold, the on-line leakage current of the bushing > the leakage current threshold, the on-line monitored SF6 gas pressure in the valve side bushing < the SF6 gas pressure attention value, the image defect recognition finds the leakage oil trace, the motor current of the submersible pump increases abnormally and C2H2 content > C2H2 first attention value, the control system is abnormal, the power supply system is abnormal, the oil level gauge shows abnormal oil level, PT100 temperature > the temperature attention value and hydrogen content > the hydrogen threshold, C2H2 content > C2H2 third attention value, motor current > the current attention value, one or more of the pressure relief valve action and the pressure relay action.

[0174] Preferably, the third condition includes: the converter transformer fault type is medium-high temperature overheating and the C2H2 alarm value is <C2H2 content <C2H2 shutdown value, the converter transformer fault type is medium-high temperature overheating and the C2H2 weekly increment alarm value is <C2H2 weekly increment <C2H2 weekly increment shutdown value, the converter transformer fault type is medium-high temperature overheating and the total hydrocarbon content is greater than the total hydrocarbon shutdown value, the converter transformer fault type is low-energy discharge and the C2H2 content is greater than the C2H2 shutdown value and the converter transformer fault type is arc discharge and the C2H2 content is greater than the C2H2 shutdown value. One or more of the shutdown value.

[0175] Preferably, the determination module includes:

[0176] The first determination module is used to determine the operation and maintenance strategy of the converter transformer as continuing to operate the transformer and strengthening chromatographic monitoring when the fault type of the converter transformer is low-temperature overheating or medium-high temperature overheating and the oil chromatogram monitoring data do not exceed the corresponding alarm value, or when the fault type of the converter transformer is local discharge or low-energy discharge or arc discharge and the C2H2 content does not exceed the C2H2 alarm value.

[0177] The second determination module is used to determine the converter transformer operation and maintenance strategy as recommending measuring DC resistance and performing on-site oil treatment when the converter transformer fault type is medium-high temperature overheating and the C2H2 alarm value is less than the C2H2 content ≤ the C2H2 shutdown value or the C2H2 weekly increment alarm value is less than the C2H2 weekly increment ≤ the C2H2 weekly increment shutdown value or the total hydrocarbon content exceeds the shutdown value.

[0178] The third determination module is used to determine the operation and maintenance strategy of the converter transformer as continuing to operate the transformer, strengthening chromatographic monitoring, and advising on-site personnel to stay away from abnormal equipment and adjacent interval areas when the fault type of the converter transformer is low-energy discharge or arc discharge and the C2H2 alarm value is <C2H2 content ≤C2H2 shutdown value.

[0179] The fourth determination module is used to determine that the operation and maintenance strategy of the converter transformer is equipment shutdown when the fault type of the converter transformer is arc discharge or low-energy discharge and the C2H2 content is greater than the shutdown value.

[0180] The fifth determination module is used to determine that the operation and maintenance strategy of the converter transformer is to strengthen the grounding current monitoring when the core fundamental grounding current is greater than the first current threshold or the clamp fundamental grounding current is greater than the second current threshold, and to carry out live grounding current measurement comparison, and determine whether to install a current limiting resistor cabinet under power according to the comparison results.

[0181] The sixth determination module is used to diagnose that the pressure failure of the converter transformer is the breakdown of the bushing capacitance screen when one or more of the on-line dielectric loss of the bushing > the dielectric loss threshold, the on-line capacitance of the bushing > the capacitance threshold, and the on-line leakage current of the bushing > the leakage current threshold are met, determine that the operation and maintenance strategy of the converter transformer is to strengthen monitoring, and replace or repair the bushing in combination with the annual inspection.

[0182] The seventh determination module is used to determine that the operation and maintenance strategy of the converter transformer is to perform infrared leak detection when the on-line monitored SF6 gas pressure in the valve-side bushing < the SF6 gas pressure attention value.

[0183] The eighth determination module is used to diagnose that the pressure failure of the converter transformer is oil leakage in the oil tank when oil leakage traces are found through image defect recognition of the oil tank image data, and determine that the operation and maintenance strategy of the converter transformer is to strengthen monitoring.

[0184] The ninth determination module is used to diagnose that the pressure failure of the converter transformer is the abnormality of the submerged oil pump when the current of the submerged oil pump motor rises abnormally and the C2H2 content > the first C2H2 attention value, and determine that the operation and maintenance strategy of the converter transformer is to check the correlation between gas production and oil pump switching.

[0185] The tenth determination module is used to diagnose that the pressure failure of the converter transformer is the abnormality of the cooler when the control system or the power supply system is abnormal, and determine that the operation and maintenance strategy of the converter transformer is to check the cooling system and monitor the oil temperature.

[0186] The eleventh determination module is used to monitor whether there is an oil leakage trace at the lower part of the conservator when the oil level gauge shows an abnormal oil level, and determine that the operation and maintenance strategy of the converter transformer is to confirm whether the actual oil level is normal through infrared temperature measurement.

[0187] The twelfth determination module is used to determine that the operation and maintenance strategy of the converter transformer is to continue running the transformer, strengthen the monitoring of the core lifting, and check the core lifting in combination with the annual inspection when the PT100 temperature > the temperature attention value and the H2 content > the hydrogen threshold, or when the C2H2 content > the third C2H2 attention value.

[0188] The thirteenth determination module is used to diagnose that the pressure failure of the converter transformer is the jamming of the tap-changer mechanism when the motor current > the current attention value, and determine that the operation and maintenance strategy of the converter transformer is to continue running the transformer, strengthen the monitoring of the core lifting, and check the core lifting in combination with the annual inspection.

[0189] The fourteenth determination module is used to diagnose the converter transformer pressure fault as abnormal discharge of the switching core or abnormal secondary circuit when the pressure relief valve or pressure relay is actuated, determine the converter transformer operation and maintenance strategy as suspending the shift of the tap changer, continuing the operation of the transformer, and checking the secondary circuit. Embodiment 3 of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the computer program is loaded into the processor, the method for converter transformer operation and maintenance based on abnormal online monitoring data described in Embodiment 1 is implemented.

[0190] Embodiment 4 of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the converter transformer operation and maintenance method based on online monitoring data anomalies according to Embodiment 1 is implemented.

[0191] Compared with the prior art, the present invention has the following beneficial effects:

[0192] The present invention uses the online detection data changes during the operation of the converter transformer to monitor the health of the converter transformer. By analyzing the data such as the oil chromatogram, the possible faults and abnormal conditions inside the converter transformer are judged, all online sensors are monitored more strictly, and all existing online parameters are combined to provide a more comprehensive operation and maintenance strategy for the converter transformer under abnormal conditions, and the ability to accurately evaluate the operating status of the converter transformer can be improved, thereby effectively preventing potential faults and improving the safe and stable operation of the equipment.

[0193] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0194] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A converter transformer operation and maintenance method based on online monitoring data anomaly, characterized in that: include: Obtain online monitoring data of converter transformers, including oil chromatography gas data and monitoring data obtained by online sensors; Use oil chromatogram gas data for prediction, and combine online sensor monitoring data to evaluate transformer operating status when oil chromatogram is abnormal; Based on the evaluation results obtained, the operation and maintenance strategies of converter transformers with abnormal oil chromatograms under different operating conditions are determined.

2. The converter transformer operation and maintenance method based on online monitoring data anomaly according to claim 1 is characterized in that: The monitoring data obtained by the online sensor includes at least one of the following: CO content, CO2 content, core fundamental wave grounding current, clamp fundamental wave grounding current, bushing dielectric loss, bushing capacitance, bushing leakage current, valve side bushing SF6 gas pressure, oil tank image data, submersible pump motor current, control system monitoring data, power supply system monitoring data, oil level gauge monitoring data, PT100 temperature, motor current, pressure relief valve action monitoring data, pressure relay action monitoring data.

3. The converter transformer operation and maintenance method based on online monitoring data abnormality according to claim 2 is characterized in that: The oil chromatogram gas data includes at least one of the following: H2 content, CH4 content, C2H6 content, C2H4 content, and C2H2 content. Prediction using the oil chromatogram gas data includes: In the case where C2H2 / C2H4<0.1 and 0.1≤CH4 / H2<1 and C2H4 / C2H6<1, or, When C2H2 / C2H4<0.1 and CH4 / H2≥1 and C2H4 / C2H6<1, the fault type of the converter transformer is determined to be low temperature overheating; In the case where C2H2 / C2H4<0.1 and CH4 / H2≥1 and 1≤C2H4 / C2H6<3, or, When C2H2 / C2H4<0.1 and C2H4 / C2H6≥3, the fault type of the converter transformer is determined to be medium-high temperature overheating; When C2H2 / C2H4<0.1, CH4 / H2<0.1 and C2H4 / C2H6<1, the fault type of the converter transformer is determined to be partial discharge; In the case of C2H2 / C2H4≥3, the fault type of the converter transformer is determined to be low-energy discharge; When 0.1≤C2H2 / C2H4<3, the fault type of the converter transformer is determined to be arc discharge; When the fault type of the converter transformer is low-temperature overheating, medium-high temperature overheating, low-energy discharge, or arc discharge, the predicted result is abnormal oil chromatography.

4. The converter transformer operation and maintenance method based on online monitoring data anomaly according to claim 3 is characterized in that: The operating status of the converter transformer includes normal operating status, caution operating status and abnormal operating status. In the case of abnormal oil chromatography, the transformer operating status is evaluated by combining the monitoring data of the online sensor, including: If the online monitoring data meets the first condition, determining that the operating state of the converter transformer is a normal operating state; If the online monitoring data meets the second condition, determining that the operating state of the converter transformer is a warning operating state; If the online monitoring data meets the third condition, it is determined that the operating state of the converter transformer is an abnormal operating state.

5. The converter transformer operation and maintenance method based on online monitoring data abnormality according to claim 4 is characterized in that: The first condition includes that each oil chromatogram monitoring data is less than or equal to the corresponding first attention value.

6. The method for maintaining and operating a converter transformer based on abnormal on-line monitoring data according to claim 4, wherein: The second condition includes: The converter transformer fault type is low-temperature overheating and each oil chromatogram monitoring data is greater than the corresponding first attention value and does not exceed the corresponding second attention value; the converter transformer fault type is medium-high temperature overheating and each oil chromatogram monitoring data is greater than the corresponding second attention value and does not exceed the corresponding alarm value; the converter transformer fault type is partial discharge and the first attention value of C2H2 < C2H2 content ≤ the second attention value of C2H2; the converter transformer fault type is low-energy discharge and the first attention value of C2H2 < C2H2 content ≤ the outage value of C2H2; the converter transformer fault type is arc discharge and the first attention value of C2H2 < C2H2 content ≤ the outage value of C2H2; the fundamental wave grounding current of the iron core > the first current threshold; the fundamental wave grounding current of the clamp > the second current threshold; on-line monitoring shows that the on-line dielectric loss of the bushing > the dielectric loss threshold, the on-line capacitance of the bushing > the capacitance threshold; the on-line leakage current of the bushing > the leakage current threshold; the on-line monitoring of the valve-side bushing shows that the SF6 gas pressure < the SF6 gas pressure attention value; the image defect recognition finds traces of oil leakage; the current of the submersible pump motor increases abnormally and the C2H2 content > the first attention value of C2H2; the control system is abnormal; the power supply system is abnormal; the oil level gauge shows abnormal oil level; the PT100 temperature > the temperature attention value and the hydrogen content > the hydrogen threshold; the C2H2 content > the third attention value of C2H2; the motor current > the current attention value; the pressure relief valve acts and the pressure relay acts, one or more of them.

7. The method for maintaining and operating a converter transformer based on abnormal on-line monitoring data according to claim 4, wherein: The third condition includes: the converter transformer fault type is medium-high temperature overheating and the alarm value of C2H2 < C2H2 content < the outage value of C2H2; the converter transformer fault type is medium-high temperature overheating and the weekly increment alarm value of C2H2 < C2H2 weekly increment < the weekly increment outage value of C2H2; the converter transformer fault type is medium-high temperature overheating and the total hydrocarbon content is greater than the total hydrocarbon outage value; the converter transformer fault type is low-energy discharge and the C2H2 content is greater than the outage value of C2H2; the converter transformer fault type is arc discharge and the C2H2 content is greater than the outage value of C2H2, one or more of them.

8. The converter transformer operation and maintenance method based on online monitoring data abnormality according to any one of claims 3 to 7, characterized in that: According to the obtained evaluation result, determining the maintenance and operation strategy of the converter transformer with abnormal oil chromatogram in different operating states includes: When the converter transformer fault type is low-temperature overheating or medium-high temperature overheating and each oil chromatogram monitoring data does not exceed the corresponding alarm value, or When the converter transformer fault type is partial discharge or low-energy discharge or arc discharge and the C2H2 content does not exceed the C2H2 alarm value, the transformer continues to operate and the chromatogram monitoring is strengthened. When the fault type of the converter transformer is medium-high temperature overheating, and the C2H2 alarm value < C2H2 content ≤ C2H2 outage value, or the C2H2 weekly increment alarm value < C2H2 weekly increment ≤ C2H2 weekly increment outage value, or the total hydrocarbon content exceeds the outage value, it is recommended to measure the DC resistance and perform on-site oil treatment; When the fault type of the converter transformer is low-energy discharge or arc discharge, and the C2H2 alarm value < C2H2 content ≤ C2H2 outage value, the transformer continues to operate, and chromatographic monitoring is strengthened. It is recommended that on-site personnel stay away from abnormal equipment and adjacent interval areas; When the fault type of the converter transformer is arc discharge or low-energy discharge, and the C2H2 content > outage value, the equipment is shut down; When the fundamental frequency grounding current of the iron core > the first current threshold or the fundamental frequency grounding current of the clamping piece > the second current threshold, strengthen the monitoring of the grounding current, and carry out the comparison measurement of the live grounding current. Determine whether to install a current-limiting resistor cabinet live according to the comparison result; When one or more of the on-line dielectric loss of the bushing > the dielectric loss threshold, the on-line capacitance of the bushing > the capacitance threshold, and the on-line leakage current of the bushing > the leakage current threshold occur, diagnose that the pressure fault of the converter transformer is the breakdown of the bushing capacitance screen, strengthen the monitoring, and replace or repair the bushing in combination with the annual inspection; When the SF6 gas pressure < the SF6 gas pressure attention value is on-line monitored in the valve-side bushing, perform infrared leak detection; When the image defect recognition of the oil tank image data finds traces of oil leakage, diagnose that the pressure fault of the converter transformer is oil leakage in the oil tank, and strengthen the monitoring; When the current of the submersible pump motor rises abnormally, and the C2H2 content is greater than the first C2H2 attention value, diagnose that the pressure fault of the converter transformer is the abnormality of the submersible pump, and conduct a correlation investigation on the gas production and the switching of the oil pump; When the control system or the power supply system is abnormal, diagnose that the pressure fault of the converter transformer is the abnormality of the cooler, check the cooling system, and monitor the oil temperature; When the oil level gauge shows abnormal oil level, monitor whether there are traces of oil leakage at the lower part of the oil conservator, and confirm whether the actual oil level is normal through infrared temperature measurement; When the PT100 temperature > the temperature attention value and the H2 content > the hydrogen threshold, or, when the C2H2 content > the third C2H2 attention value, the transformer continues to operate, and strengthen the monitoring of the core lifting. Check the core lifting in combination with the annual inspection; When the motor current > the current attention value, diagnose that the pressure fault of the converter transformer is the jamming of the tap-changer mechanism. The transformer continues to operate, and strengthen the monitoring of the core lifting. Check the core lifting in combination with the annual inspection; When the pressure relief valve or the pressure relay operates, diagnose that the pressure fault of the converter transformer is abnormal discharge of the switching core or abnormal secondary circuit. The tap-changer suspends gear shifting, the transformer continues to operate, and check the secondary circuit.

9. The converter transformer operation and maintenance method based on online monitoring data anomaly according to claim 8 is characterized in that: After obtaining the on-line monitoring data of the converter transformer, the method further includes: Clean the on-line monitoring data to obtain the on-line monitoring data after data cleaning.

10. A converter transformer operation and maintenance system based on online monitoring data anomaly, characterized in that: Including: An acquisition module for acquiring on-line monitoring data of the converter transformer, where the on-line monitoring data includes oil chromatographic gas data and monitoring data obtained by on-line sensors; An evaluation module is used to make predictions using the oil chromatogram gas data and evaluate the transformer operating status in combination with the monitoring data of the online sensor in the event of an oil chromatogram abnormality; The determination module is used to determine the operation and maintenance strategy of the converter transformer with abnormal oil color spectrum under different operating conditions according to the evaluation results.

11. The converter transformer operation and maintenance system based on online monitoring data abnormality according to claim 10 is characterized in that: The operating status of the converter transformer includes normal operating status, caution operating status and abnormal operating status. The evaluation modules include: Prediction module, used to use oil chromatogram gas data to make a prediction and determine whether the oil chromatogram is abnormal; A first judgment module is used to judge whether the online monitoring data meets the first condition when the oil chromatogram is abnormal, and if the online monitoring data meets the first condition, determine that the operating state of the converter transformer is a normal operating state; A second judgment module is used to judge whether the online monitoring data meets the second condition when the oil chromatogram is abnormal, and if the online monitoring data meets the second condition, determine that the operating state of the converter transformer is a warning operating state; The third judgment module is used to judge whether the online monitoring data meets the third condition when the oil chromatogram is abnormal, and if the online monitoring data meets the third condition, determine that the operating state of the converter transformer is an abnormal operating state.

12. The converter transformer operation and maintenance system based on online monitoring data abnormality according to claim 11, characterized in that: The oil chromatogram gas data includes at least one of the following: H2 content, CH4 content, C2H6 content, C2H4 content, C2H2 content, and the prediction module is used for: In the case where C2H2 / C2H4<0.1 and 0.1≤CH4 / H2<1 and C2H4 / C2H6<1, or, When C2H2 / C2H4<0.1 and CH4 / H2≥1 and C2H4 / C2H6<1, the fault type of the converter transformer is determined to be low temperature overheating; In the case where C2H2 / C2H4<0.1 and CH4 / H2≥1 and 1≤C2H4 / C2H6<3, or, When C2H2 / C2H4<0.1 and C2H4 / C2H6≥3, the fault type of the converter transformer is determined to be medium-high temperature overheating; When C2H2 / C2H4<0.1, CH4 / H2<0.1 and C2H4 / C2H6<1, the fault type of the converter transformer is determined to be partial discharge; In the case of C2H2 / C2H4≥3, the fault type of the converter transformer is determined to be low-energy discharge; When 0.1≤C2H2 / C2H4<3, the fault type of the converter transformer is determined to be arc discharge; When the fault type of the converter transformer is low-temperature overheating, medium-high temperature overheating, low-energy discharge, or arc discharge, the predicted result is abnormal oil chromatography.

13. The converter transformer operation and maintenance system based on online monitoring data abnormality according to claim 11, characterized in that: The first condition includes: each oil chromatogram monitoring data is less than or equal to the corresponding first attention value.

14. The converter transformer operation and maintenance system based on abnormal on-line monitoring data according to claim 11, wherein: The second condition includes: the converter transformer fault type is low-temperature overheating and each oil chromatogram monitoring data is greater than the corresponding first attention value and does not exceed the corresponding second attention value; the converter transformer fault type is medium-high temperature overheating and each oil chromatogram monitoring data is greater than the corresponding second attention value and does not exceed the corresponding alarm value; the converter transformer fault type is partial discharge and the first attention value of C2H2 < C2H2 content ≤ the second attention value of C2H2; the converter transformer fault type is low-energy discharge and the first attention value of C2H2 < C2H2 content ≤ the outage value of C2H2; the converter transformer fault type is arc discharge and the first attention value of C2H2 < C2H2 content ≤ the outage value of C2H2; the fundamental frequency grounding current of the iron core > the first current threshold; the fundamental frequency grounding current of the clamping piece > the second current threshold; on-line monitoring shows that the on-line dielectric loss of the bushing > the dielectric loss threshold, the on-line capacitance of the bushing > the capacitance threshold; the on-line leakage current of the bushing > the leakage current threshold; the on-line monitored SF6 gas pressure in the valve-side bushing < the SF6 gas pressure attention value; the image defect recognition finds traces of oil leakage; the current of the submersible pump motor increases abnormally and the C2H2 content > the first attention value of C2H2; the control system is abnormal; the power supply system is abnormal; the oil level gauge shows abnormal oil level; the PT100 temperature > the temperature attention value and the hydrogen content > the hydrogen threshold; the C2H2 content > the third attention value of C2H2; the motor current > the current attention value; the pressure relief valve acts and the pressure relay acts, one or more of them.

15. The converter transformer operation and maintenance system based on abnormal on-line monitoring data according to claim 11, wherein: The third condition includes: the converter transformer fault type is medium-high temperature overheating and the alarm value of C2H2 < C2H2 content < the outage value of C2H2; the converter transformer fault type is medium-high temperature overheating and the weekly increment alarm value of C2H2 < C2H2 weekly increment < the weekly increment outage value of C2H2; the converter transformer fault type is medium-high temperature overheating and the total hydrocarbon content is greater than the total hydrocarbon outage value; the converter transformer fault type is low-energy discharge and the C2H2 content is greater than the outage value of C2H2; the converter transformer fault type is arc discharge and the C2H2 content is greater than the outage value of C2H2, one or more of them.

16. The converter transformer operation and maintenance system based on abnormal on-line monitoring data according to claim 11, wherein: The determination module includes: The first determination module is used to determine that the converter transformer operation and maintenance strategy is to continue running the transformer and strengthen chromatogram monitoring when the converter transformer fault type is low-temperature overheating or medium-high temperature overheating and each oil chromatogram monitoring data does not exceed the corresponding alarm value, or when the converter transformer fault type is partial discharge or low-energy discharge or arc discharge and the C2H2 content does not exceed the alarm value of C2H2; The second determination module is used to determine that the operation and maintenance strategy of the converter transformer is to recommend measuring the DC resistance and performing on-site oil treatment when the fault type of the converter transformer is medium-high temperature overheating, and the C2H2 alarm value < C2H2 content ≤ C2H2 shutdown value or the C2H2 weekly increment alarm value < C2H2 weekly increment ≤ C2H2 weekly increment shutdown value or the total hydrocarbon content exceeds the shutdown value; The third determination module is used to determine that the operation and maintenance strategy of the converter transformer is for the transformer to continue operating, strengthen chromatographic monitoring, and recommend that on-site personnel stay away from abnormal equipment and adjacent interval areas when the fault type of the converter transformer is low-energy discharge or arc discharge, and the C2H2 alarm value < C2H2 content ≤ C2H2 shutdown value; The fourth determination module is used to determine that the operation and maintenance strategy of the converter transformer is for the equipment to be shut down when the fault type of the converter transformer is arc discharge or low-energy discharge, and the C2H2 content > the shutdown value; The fifth determination module is used to determine that the operation and maintenance strategy of the converter transformer is to strengthen the monitoring of the grounding current, carry out on-line measurement and comparison of the grounding current, and determine whether to install a current-limiting resistor cabinet live according to the comparison result when the fundamental wave grounding current of the iron core > the first current threshold or the fundamental wave grounding current of the clamping piece > the second current threshold; The sixth determination module is used to diagnose that the converter transformer pressure failure is a breakdown of the bushing capacitance screen when the on-line dielectric loss of the bushing > the dielectric loss threshold, the on-line capacitance of the bushing > the capacitance threshold, and the on-line leakage current of the bushing > the leakage current threshold, and determine that the operation and maintenance strategy of the converter transformer is to strengthen the monitoring and replace or repair the bushing in combination with the annual inspection; The seventh determination module is used to determine that the operation and maintenance strategy of the converter transformer is to perform infrared leak detection when the on-line monitored SF6 gas pressure in the valve-side bushing < the SF6 gas pressure attention value; The eighth determination module is used to diagnose that the converter transformer pressure failure is oil leakage from the oil tank when oil leakage traces are found by image defect recognition of the oil tank image data, and determine that the operation and maintenance strategy of the converter transformer is to strengthen the monitoring; The ninth determination module is used to diagnose that the converter transformer pressure failure is abnormal operation of the submersible oil pump when the current of the submersible oil pump motor rises abnormally and the C2H2 content is greater than the first C2H2 attention value, and determine that the operation and maintenance strategy of the converter transformer is to conduct a correlation investigation of gas production and pump switching; The tenth determination module is used to diagnose that the converter transformer pressure failure is abnormal operation of the cooler when the control system or power supply system is abnormal, and determine that the operation and maintenance strategy of the converter transformer is to check the cooling system and monitor the oil temperature; The eleventh determination module is used to monitor whether there are oil leakage traces at the lower part of the oil conservator when the oil level gauge shows abnormal oil level, and determine that the operation and maintenance strategy of the converter transformer is to confirm whether the actual oil level is normal through infrared temperature measurement; The twelfth determination module is used to determine that the operation and maintenance strategy of the converter transformer is for the transformer to continue operating, strengthen the monitoring of the core lifting, and check the core lifting in combination with the annual inspection when the PT100 temperature > the temperature attention value and the H2 content > the hydrogen threshold, or when the C2H2 content > the third C2H2 attention value; The thirteenth determination module is used to diagnose the converter transformer fault as a stuck tap switch mechanism when the motor current is greater than the current caution value, determine the converter transformer operation and maintenance strategy as the transformer continues to operate, strengthen monitoring of the hanging core, and inspect the hanging core in conjunction with the annual inspection; The fourteenth determination module is used to diagnose the converter transformer pressure fault as abnormal discharge of the switching core or abnormal secondary circuit when the pressure relief valve or the pressure relay is actuated, determine the converter transformer operation and maintenance strategy as suspending the shifting of the tap changer, continuing the operation of the transformer, and checking the secondary circuit.

17. An electronic device, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is used to operate according to the instruction to execute the steps of the converter transformer operation and maintenance method based on online monitoring data abnormality according to any one of claims 1 to 9.

18. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the converter transformer operation and maintenance method based on abnormal online monitoring data as described in any one of claims 1 to 9 are implemented.

Images