Method and system for fault defect detection of valve side bushing of converter transformer

Abstract

The invention discloses a method and a system for fault defect detection of a valve side bushing of a converter transformer, and belongs to the technical field of electric power equipment. The method comprises the following steps: acquiring information data of the operation state of the valve side bushing of the converter; based on a pre-established AI model and a pre-established DT model, judging the value of the information data, and obtaining a judgment result; and determining the fault defect of the converter transformer valve side bushing based on the judgment result. Whether the valve side casing pipe breaks down or not can be judged by judging the information data, reliability is high, and efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and more specifically, to a method and system for detecting fault defects of a bushing on a valve side of a converter transformer. Background Art

[0002] With economic development, society's demand for electric energy is increasing, and it is of great significance to ensure the safety and stability of electric energy transmission. my country's energy load distribution is different. In order to reduce the loss of long-distance electric energy transmission on the line, high-voltage DC transmission is usually adopted. Compared with AC transmission, high-voltage DC transmission has great advantages. The DC system is mainly composed of converter stations (including converter transformers and converter valves and other converter devices), compensation devices, lightning arresters, etc. Generally, for equipment in the power system, insulation failure or potential failure is one of the main causes of electrical equipment failure.

[0003] Therefore, to ensure the safe and stable operation of the equipment, it is necessary to ensure its good insulation. As the "heart" of the DC transmission system, the converter transformer works together with the converter valve to invert DC power and rectify AC power. At the same time, it also plays the role of electrical isolation and overvoltage limitation. Due to the severe operating conditions, the insulation performance of the valve-side bushing of the converter transformer has been subjected to a very severe test.

[0004] The valve-side bushing of the converter transformer is an important part of the converter transformer and one of the key equipment to ensure the normal operation of the DC transmission project. The operating environment of the valve-side bushing of the converter transformer is special and needs to withstand the combined assessment of electric field, temperature field and mechanical properties under different voltage forms such as DC, power frequency, impact, high-order harmonics and polarity reversal.

[0005] Due to the long-term high temperature and high voltage electrical stress, the bushing insulation performance of the converter transformer valve side is constantly deteriorating. According to the operation of converter transformers on site in recent years, the causes of power outages in the past were largely due to the deterioration of the bushing insulation of the converter transformer, such as severe insulation heating, insulation damage, and severe partial discharge, etc. In severe cases, explosions may occur, endangering the safety of transmission lines, causing large-scale power outages, and causing huge losses.

[0006] However, there is a relative lack of evaluation methods related to the status of power equipment, which are mainly based on offline detection. There are problems such as untimely diagnosis and discontinuous data, which make it impossible to accurately evaluate it. Especially in the diagnosis of power equipment, due to the large number of characteristic parameters involved in power equipment and the complexity of the environment in which the equipment is located, traditional evaluation methods are often difficult to apply effectively. Existing intelligent evaluation methods perform poorly in processing large-scale data and complex situations, and it is difficult to capture nonlinear relationships between features and complex data patterns. Summary of the invention

[0007] In view of the above problems, the present invention proposes a method for detecting fault defects of a bushing on the valve side of a converter transformer, comprising:

[0008] Obtaining information data on the operating status of the bushing on the valve side of the converter inverter;

[0009] Based on the pre-established AI model and DT model, the value of the information data is judged to obtain a judgment result;

[0010] Based on the judgment result, the fault defect of the valve-side bushing of the converter transformer is determined.

[0011] Optional, converter converter valve side bushing, including:

[0012] Oil-impregnated paper filled SF6 valve side bushing and glue-impregnated paper filled SF6 valve side bushing.

[0013] Optional information data, including: online monitoring data, live detection data, power outage test data and inspection data.

[0014] Optionally, based on the judgment result, the fault defects of the valve side bushing of the converter transformer are determined, including: discharge fault of the oil-impregnated paper-filled SF6 valve side bushing, discharge fault of the rubber-impregnated paper-filled SF6 valve side bushing and capacitor screen breakdown defect fault of the rubber-impregnated paper-filled SF6 valve side bushing.

[0015] Optionally, based on the judgment result, determining the discharge fault of the bushing on the oil-immersed paper-filled SF6 valve side includes:

[0016] Based on the AI ​​model and the information data, it is determined that the three-phase comparison of the bushing end screen voltage is less than the third preset value D3, and a first evaluation is given;

[0017] If, based on the information data, it is determined that the SF6 gas composition is abnormal and the bushing electrical parameters are abnormal, then it is determined whether the SO2 and H2S gas concentrations in the SF6 gas in the online monitoring data are greater than 0, and whether the corresponding handover value deviation of the electrical parameters is greater than the fourth preset value D4. If both are true, it is determined that a discharge fault has occurred in the bushing on the oil-immersed paper-filled SF6 valve side.

[0018] Optionally, the method further includes:

[0019] Based on the DT model, according to the information data, it is determined whether the SF6 gas pressure is less than the first preset value D1. If so, a second evaluation is given, and an infrared leakage detection is performed on the oil-immersed paper-filled SF6 valve side bushing. According to the information data, it is determined whether the SF6 gas pressure is less than the second preset value D2. If so, a first evaluation is given, and an infrared leakage detection is performed on the valve side bushing of the converter transformer.

[0020] Optionally, based on the judgment result, determining a discharge fault of a bushing on the side of a rubber-impregnated paper-filled SF6 valve includes:

[0021] Based on the AI ​​model and the information data, it is determined that the three-phase ratio of the bushing end screen voltage is less than the seventh preset value D7, and a first evaluation is given;

[0022] If the SF6 gas composition and bushing electrical parameters are determined to be abnormal based on the information data, then determine whether the SO2 and H2S gas concentrations in the SF6 gas are greater than 0, and whether the corresponding handover value deviations of the electrical parameters are greater than the eighth preset value D8. If both are true, it is determined that a discharge fault has occurred in the bushing on the oil-immersed paper-filled SF6 valve side.

[0023] Optionally, the method further includes:

[0024] Based on the DT model, according to the information data, determine whether the SF6 gas pressure is less than the fifth preset value D5. If so, give a second evaluation, and perform infrared leakage detection on the oil-immersed paper-filled SF6 valve side casing. According to the information data, determine whether the SF6 gas pressure is less than the sixth preset value D6. If so, give a first evaluation, and perform infrared leakage detection.

[0025] Optionally, based on the judgment result, determining that the capacitor screen breakdown defect fault of the oil-immersed paper-filled SF6 valve side bushing comprises:

[0026] Based on the AI ​​model and the DT model, according to the information data, it is judged that the three-phase contrast of the bushing end screen voltage is less than the ninth preset value D9 and the number of capacitor screen breakdowns corresponding to the voltage increase is greater than 1, then it is determined that a local capacitor screen in the oil-immersed paper-filled SF6 valve side bushing has a breakdown defect;

[0027] Based on the AI ​​model and the DT model, according to the information data, determine whether the three-phase ratio of the bushing end screen voltage is less than the tenth preset value D10, and whether the corresponding handover value deviation of the electrical parameter is greater than the eleventh preset value. If both are true, a first evaluation is given, and it is determined that the oil-immersed paper-filled SF6 valve side bushing has a capacitor screen breakdown defect.

[0028] Optionally, the method further includes:

[0029] Based on the AI ​​model and the DT model, according to the information data, it is judged that the three-phase contrast of the bushing end screen voltage is less than the ninth preset value D9 and the number of capacitor screen breakdowns corresponding to the voltage increase is greater than 1, then it is determined that a local capacitor screen breakdown defect occurs in the oil-immersed paper-filled SF6 valve side bushing, and a second evaluation is given.

[0030] Optional, first evaluation, including:

[0031] If there is a device failure, take immediate measures to repair or replace the device.

[0032] Optional, second evaluation, including:

[0033] It is recommended to perform routine inspection or maintenance on the equipment.

[0034] On the other hand, the present invention also provides a system for detecting a fault defect of a bushing on the valve side of a converter transformer, comprising:

[0035] A data acquisition unit, used to obtain information data on the operating status of the bushing on the valve side of the converter;

[0036] A judgment unit, used to judge the value of the information data based on a pre-established AI model and a DT model, and obtain a judgment result;

[0037] A detection unit is used to determine the fault defect of the valve-side bushing of the converter transformer based on the judgment result.

[0038] Optional, converter converter valve side bushing, including:

[0039] Oil-impregnated paper filled SF6 valve side bushing and glue-impregnated paper filled SF6 valve side bushing.

[0040] Optional information data, including: online monitoring data, live detection data, power outage test data and inspection data.

[0041] Optionally, the detection unit determines the fault defects of the valve side bushing of the converter transformer based on the judgment result, including: discharge fault of the oil-impregnated paper-filled SF6 valve side bushing, discharge fault of the rubber-impregnated paper-filled SF6 valve side bushing and capacitor screen breakdown defect fault of the rubber-impregnated paper-filled SF6 valve side bushing.

[0042] Optionally, the detection unit determines the discharge fault of the oil-immersed paper-filled SF6 valve-side bushing based on the judgment result, including:

[0043] Based on the AI ​​model and the information data, it is determined that the three-phase comparison of the bushing end screen voltage is less than the third preset value D3, and a first evaluation is given;

[0044] If, based on the information data, it is determined that the SF6 gas composition is abnormal and the bushing electrical parameters are abnormal, then it is determined whether the SO2 and H2S gas concentrations in the SF6 gas in the online monitoring data are greater than 0, and whether the corresponding handover value deviation of the electrical parameters is greater than the fourth preset value D4. If both are true, it is determined that a discharge fault has occurred in the bushing on the oil-immersed paper-filled SF6 valve side.

[0045] Optionally, the detection unit is further used for:

[0046] Based on the DT model, according to the information data, it is determined whether the SF6 gas pressure is less than the first preset value D1. If so, a second evaluation is given, and an infrared leakage detection is performed on the oil-immersed paper-filled SF6 valve side bushing. According to the information data, it is determined whether the SF6 gas pressure is less than the second preset value D2. If so, a first evaluation is given, and an infrared leakage detection is performed on the valve side bushing of the converter transformer.

[0047] Optionally, the detection unit determines the discharge fault of the rubber-impregnated paper SF6-filled valve-side bushing based on the judgment result, including:

[0048] Based on the AI ​​model and the information data, it is determined that the three-phase ratio of the bushing end screen voltage is less than the seventh preset value D7, and a first evaluation is given;

[0049] If the SF6 gas composition and bushing electrical parameters are determined to be abnormal based on the information data, then determine whether the SO2 and H2S gas concentrations in the SF6 gas are greater than 0, and whether the corresponding handover value deviations of the electrical parameters are greater than the eighth preset value D8. If both are true, it is determined that a discharge fault has occurred in the bushing on the oil-immersed paper-filled SF6 valve side.

[0050] Optionally, the detection unit is further used for:

[0051] Based on the DT model, according to the information data, determine whether the SF6 gas pressure is less than the fifth preset value D5. If so, give a second evaluation, and perform infrared leakage detection on the oil-immersed paper-filled SF6 valve side casing. According to the information data, determine whether the SF6 gas pressure is less than the sixth preset value D6. If so, give a first evaluation, and perform infrared leakage detection.

[0052] Optionally, the detection unit determines the capacitor screen breakdown defect fault of the oil-immersed paper-filled SF6 valve side bushing based on the judgment result, including:

[0053] Based on the AI ​​model and the DT model, according to the information data, it is judged that the three-phase contrast of the bushing end screen voltage is less than the ninth preset value D9 and the number of capacitor screen breakdowns corresponding to the voltage increase is greater than 1, then it is determined that a local capacitor screen in the oil-immersed paper-filled SF6 valve side bushing has a breakdown defect;

[0054] Based on the AI ​​model and the DT model, according to the information data, determine whether the three-phase ratio of the bushing end screen voltage is less than the tenth preset value D10, and whether the corresponding handover value deviation of the electrical parameter is greater than the eleventh preset value. If both are true, a first evaluation is given, and it is determined that the oil-immersed paper-filled SF6 valve side bushing has a capacitor screen breakdown defect.

[0055] Optionally, the detection unit is further used for:

[0056] Based on the AI ​​model and the DT model, according to the information data, it is judged that the three-phase contrast of the bushing end screen voltage is less than the ninth preset value D9 and the number of capacitor screen breakdowns corresponding to the voltage increase is greater than 1, then it is determined that a local capacitor screen breakdown defect occurs in the oil-immersed paper-filled SF6 valve side bushing, and a second evaluation is given.

[0057] Optional, first evaluation, including:

[0058] If there is a device failure, take immediate measures to repair or replace the device.

[0059] Optional, second evaluation, including:

[0060] It is recommended to perform routine inspection or maintenance on the equipment.

[0061] In yet another aspect, the present invention further provides a computing device, comprising: one or more processors;

[0062] a processor for executing one or more programs;

[0063] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0064] In yet another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the method described above is implemented.

[0065] Compared with the prior art, the present invention has the following beneficial effects:

[0066] The present invention provides a method for detecting fault defects of valve-side bushings of converter transformers, comprising: obtaining information data of the operating status of the valve-side bushings of converter transformers; judging the value of the information data based on a pre-established AI model and a DT model to obtain a judgment result; and determining the fault defect of the valve-side bushings of the converter transformer based on the judgment result. The present invention can judge whether the valve-side bushings are faulty by judging the information data, with high reliability and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 is a flow chart of the method of the present invention;

[0068] Figure 2 This is a flow chart of the fault judgment of the SF6 side of the casing on the oil-immersed paper-filled SF6 valve side according to an embodiment of the present invention;

[0069] Figure 3 This is a flow chart of the fault diagnosis of the SF6 side of the casing on the side of the rubber-impregnated paper SF6-filled valve according to an embodiment of the present invention;

[0070] Figure 4 This is a fault diagnosis flow chart of the breakdown defect of the capacitor screen of the casing of the SF6-filled rubber-impregnated paper valve according to an embodiment of the present invention;

[0071] Figure 5 It is a system structure diagram of the present invention. DETAILED DESCRIPTION

[0072] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0073] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0074] Embodiment 1:

[0075] The present invention proposes a method for detecting fault defects of bushings on the valve side of a converter transformer. Figure 1 As shown, including:

[0076] Step 1, obtaining information data of the operating status of the bushing on the valve side of the converter converter;

[0077] Step 2: Based on the pre-established AI model and DT model, the value of the information data is judged to obtain a judgment result;

[0078] Step 3: Based on the judgment result, determine the fault defect of the valve-side bushing of the converter transformer.

[0079] The valve side bushing of the converter includes:

[0080] Oil-impregnated paper filled SF6 valve side bushing and glue-impregnated paper filled SF6 valve side bushing.

[0081] Among them, information data includes: online monitoring data, live detection data, power outage test data and inspection data.

[0082] Among them, based on the judgment result, the fault defects of the valve side bushing of the converter transformer are determined, including: discharge fault of the oil-impregnated paper-filled SF6 valve side bushing, discharge fault of the rubber-impregnated paper-filled SF6 valve side bushing and capacitor screen breakdown defect fault of the rubber-impregnated paper-filled SF6 valve side bushing.

[0083] Wherein, based on the judgment result, determining the discharge fault of the bushing on the oil-immersed paper-filled SF6 valve side includes:

[0084] Based on the AI ​​model and the information data, it is determined that the three-phase comparison of the bushing end screen voltage is less than the third preset value D3, and a first evaluation is given;

[0085] If, based on the information data, it is determined that the SF6 gas composition is abnormal and the bushing electrical parameters are abnormal, then it is determined whether the SO2 and H2S gas concentrations in the SF6 gas in the online monitoring data are greater than 0, and whether the corresponding handover value deviation of the electrical parameters is greater than the fourth preset value D4. If both are true, it is determined that a discharge fault has occurred in the bushing on the oil-immersed paper-filled SF6 valve side.

[0086] The method further includes:

[0087] Based on the DT model, according to the information data, it is determined whether the SF6 gas pressure is less than the first preset value D1. If so, a second evaluation is given, and an infrared leakage detection is performed on the oil-immersed paper-filled SF6 valve side bushing. According to the information data, it is determined whether the SF6 gas pressure is less than the second preset value D2. If so, a first evaluation is given, and an infrared leakage detection is performed on the valve side bushing of the converter transformer.

[0088] Wherein, based on the judgment result, determining the discharge fault of the bushing on the side of the SF6-filled rubber-impregnated paper valve includes:

[0089] Based on the AI ​​model and the information data, it is determined that the three-phase ratio of the bushing end screen voltage is less than the seventh preset value D7, and a first evaluation is given;

[0090] If the SF6 gas composition and bushing electrical parameters are determined to be abnormal based on the information data, then determine whether the SO2 and H2S gas concentrations in the SF6 gas are greater than 0, and whether the corresponding handover value deviations of the electrical parameters are greater than the eighth preset value D8. If both are true, it is determined that a discharge fault has occurred in the bushing on the oil-immersed paper-filled SF6 valve side.

[0091] The method further includes:

[0092] Based on the DT model, according to the information data, determine whether the SF6 gas pressure is less than the fifth preset value D5. If so, give a second evaluation, and perform infrared leakage detection on the oil-immersed paper-filled SF6 valve side casing. According to the information data, determine whether the SF6 gas pressure is less than the sixth preset value D6. If so, give a first evaluation, and perform infrared leakage detection.

[0093] Wherein, based on the judgment result, determining the capacitor screen breakdown defect fault of the oil-immersed paper-filled SF6 valve side bushing includes:

[0094] Based on the AI ​​model and the DT model, according to the information data, it is judged that the three-phase contrast of the bushing end screen voltage is less than the ninth preset value D9 and the number of capacitor screen breakdowns corresponding to the voltage increase is greater than 1, then it is determined that a local capacitor screen in the oil-immersed paper-filled SF6 valve side bushing has a breakdown defect;

[0095] Based on the AI ​​model and the DT model, according to the information data, determine whether the three-phase ratio of the bushing end screen voltage is less than the tenth preset value D10, and whether the corresponding handover value deviation of the electrical parameter is greater than the eleventh preset value. If both are true, a first evaluation is given, and it is determined that the oil-immersed paper-filled SF6 valve side bushing has a capacitor screen breakdown defect.

[0096] The method further includes:

[0097] Based on the AI ​​model and the DT model, according to the information data, it is judged that the three-phase contrast of the bushing end screen voltage is less than the ninth preset value D9 and the number of capacitor screen breakdowns corresponding to the voltage increase is greater than 1, then it is determined that a local capacitor screen breakdown defect occurs in the oil-immersed paper-filled SF6 valve side bushing, and a second evaluation is given.

[0098] Among them, the first evaluation includes:

[0099] If there is a device failure, take immediate measures to repair or replace the device.

[0100] The second evaluation includes:

[0101] It is recommended to perform routine inspection or maintenance on the equipment.

[0102] The present invention will be further described below in conjunction with the embodiments of the present invention:

[0103] The embodiment includes a defect fault detection and judgment process of oil-impregnated paper-filled SF6 valve-side bushing and glue-impregnated paper-filled SF6 valve-side bushing of a converter transformer;

[0104] The information on the operating status of the converter transformer valve sleeve comes from online monitoring data, live detection data, power outage test data and inspection data;

[0105] like Figure 2As shown, the oil-immersed paper-filled SF6 valve side bushing is initially in normal operation. Based on the online monitoring data, if the monitored SF6 gas pressure is less than D1, a second evaluation is given and an infrared leak detection is performed. At this time, continue to pay attention to the SF6 gas pressure of the oil-immersed paper-filled SF6 valve side bushing. If the monitored SF6 gas pressure is less than D2, a first evaluation is given and an infrared leak detection is performed;

[0106] If the three-phase ratio of the bushing end screen voltage is monitored to be greater than D3, the first evaluation is given. At this time, the bushing electrical parameters are continuously monitored. Based on the power outage test data, if the SO2 and H2S gas concentrations in SF6 are detected to be greater than 0 and the corresponding handover value deviation of the electrical parameters is greater than D4, the fault diagnosis is "discharge occurs on the SF6 side of the bushing";

[0107] Figure 2 The voltage detection link of the middle casing end screen is performed by the AI ​​model through reasoning based on the online monitoring data results.

[0108] Figure 2 The SF6 gas pressure detection link of the middle casing is carried out by the DT model through model deduction based on the online monitoring data results.

[0109] like Figure 3 As shown, the rubber-impregnated paper SF6 valve-side bushing is initially in normal operation. Based on the online monitoring data, if the monitored SF6 gas pressure is less than D5, a second evaluation is given and infrared leakage detection is performed. At this time, continue to pay attention to the SF6 gas pressure of the oil-impregnated paper SF6 valve-side bushing. If the monitored SF6 gas pressure is less than D6, a first evaluation is given and infrared leakage detection is performed;

[0110] If the three-phase ratio of the bushing end screen voltage is greater than D7, the first evaluation is given. At this time, the bushing electrical parameters are continuously monitored. Based on the power outage test data, if the SO2 and H2S gas concentrations in SF6 are greater than 0 and the corresponding handover value deviation of the electrical parameters is greater than D8, the fault diagnosis is "discharge occurs on the SF6 side of the bushing".

[0111] Figure 3 The voltage detection link of the middle casing end screen is performed by the AI ​​model through reasoning based on the online monitoring data results.

[0112] Figure 3 The SF6 gas pressure detection link of the middle casing is carried out by the DT model through model deduction based on the online monitoring data results.

[0113] like Figure 4As shown, the rubber-impregnated paper-filled SF6 valve-side bushing is initially in normal operation. Based on the online monitoring data, if the three-phase ratio of the bushing end screen voltage is monitored to be greater than D9 and the number of capacitor screen breakdowns corresponding to the voltage increase is calculated to be greater than 1, the defect diagnosis is "local capacitor screen breakdown defects exist during bushing operation", and a second evaluation is given, and it is recommended to strengthen monitoring. At this time, continue to pay attention to the various electrical parameters of the bushing. Based on the power outage test data, if the three-phase ratio of the bushing end screen voltage is monitored to be greater than D10 and the deviation of the corresponding handover value of the electrical parameter is greater than D11, a first evaluation is given, and it is recommended to apply for shutdown and replace the bushing;

[0114] Figure 4 The voltage detection link of the middle casing end screen is performed by the AI ​​model through reasoning based on the online monitoring data results.

[0115] Figure 4 The capacitor screen breakdown detection link corresponding to the increase in the middle bushing voltage is carried out by the DT model through model deduction based on the online monitoring data results.

[0116] The above parameters are explained as follows:

[0117] Gas pressure: D1, D2, D5, D6, collected through the pressure sensor at the casing gas valve;

[0118] Comparison of three-phase end-screen voltages: D3, D7, D9, and D10, obtained through the bushing end-screen electrical signal acquisition device;

[0119] The electrical parameters correspond to the handover values: D4, D8, D11, which are obtained through electrical test measurements;

[0120] In the condition assessment of power equipment, color codes are usually used to indicate the operating status and health of the equipment. Specifically:

[0121] Yellow Code: Indicates that the equipment may have certain abnormalities or potential problems, but they are not serious yet. The equipment can still continue to operate. It is recommended to arrange inspection or maintenance as soon as possible.

[0122] Red Code: Indicates that the device may have a serious fault and it is recommended to take immediate measures to repair or replace it.

[0123] The present invention is used to detect fault defects of the valve-side bushing of the converter transformer. By extracting multiple characteristic parameters during the operation of the valve-side bushing of the converter transformer, strict reasoning is performed according to the logical reasoning flow chart, so as to diagnose the bushing defects for different types of faults and provide operation and maintenance suggestions. This invention determines the threshold of each criterion, and introduces artificial intelligence and digital twin technology for image recognition and logical deduction, thereby significantly improving the reliability of fault diagnosis.

[0124] Embodiment 2:

[0125] The present invention also proposes a system 200 for detecting faults in bushings on the valve side of a converter transformer. Figure 5 As shown, including:

[0126] The data acquisition unit 201 is used to obtain information data on the operating status of the bushing on the valve side of the converter converter;

[0127] A judgment unit 202 is used to judge the value of the information data based on a pre-established AI model and a DT model to obtain a judgment result;

[0128] The detection unit 203 is used to determine the fault defect of the valve-side bushing of the converter transformer based on the judgment result.

[0129] The valve side bushing of the converter includes:

[0130] Oil-impregnated paper filled SF6 valve side bushing and glue-impregnated paper filled SF6 valve side bushing.

[0131] Among them, information data includes: online monitoring data, live detection data, power outage test data and inspection data.

[0132] Among them, the detection unit 203 determines the fault defects of the valve side bushing of the converter transformer based on the judgment result, including: the discharge fault of the oil-impregnated paper-filled SF6 valve side bushing, the discharge fault of the rubber-impregnated paper-filled SF6 valve side bushing and the capacitor screen breakdown defect fault of the rubber-impregnated paper-filled SF6 valve side bushing.

[0133] The detection unit 203 determines the discharge fault of the oil-immersed paper-filled SF6 valve-side bushing based on the judgment result, including:

[0134] Based on the AI ​​model and the information data, it is determined that the three-phase comparison of the bushing end screen voltage is less than the third preset value D3, and a first evaluation is given;

[0135] If, based on the information data, it is determined that the SF6 gas composition is abnormal and the bushing electrical parameters are abnormal, then it is determined whether the SO2 and H2S gas concentrations in the SF6 gas in the online monitoring data are greater than 0, and whether the corresponding handover value deviation of the electrical parameters is greater than the fourth preset value D4. If both are true, it is determined that a discharge fault has occurred in the bushing on the oil-immersed paper-filled SF6 valve side.

[0136] The detection unit 203 is also used for:

[0137] Based on the DT model, according to the information data, it is determined whether the SF6 gas pressure is less than the first preset value D1. If so, a second evaluation is given, and an infrared leakage detection is performed on the oil-immersed paper-filled SF6 valve side bushing. According to the information data, it is determined whether the SF6 gas pressure is less than the second preset value D2. If so, a first evaluation is given, and an infrared leakage detection is performed on the valve side bushing of the converter transformer.

[0138] The detection unit 203 determines the discharge fault of the SF6-filled rubber-impregnated paper valve-side bushing based on the judgment result, including:

[0139] Based on the AI ​​model and the information data, it is determined that the three-phase ratio of the bushing end screen voltage is less than the seventh preset value D7, and a first evaluation is given;

[0140] If the SF6 gas composition and bushing electrical parameters are determined to be abnormal based on the information data, then determine whether the SO2 and H2S gas concentrations in the SF6 gas are greater than 0, and whether the corresponding handover value deviations of the electrical parameters are greater than the eighth preset value D8. If both are true, it is determined that a discharge fault has occurred in the bushing on the oil-immersed paper-filled SF6 valve side.

[0141] The detection unit 203 is also used for:

[0142] Based on the DT model, according to the information data, determine whether the SF6 gas pressure is less than the fifth preset value D5. If so, give a second evaluation, and perform infrared leakage detection on the oil-immersed paper-filled SF6 valve side casing. According to the information data, determine whether the SF6 gas pressure is less than the sixth preset value D6. If so, give a first evaluation, and perform infrared leakage detection.

[0143] The detection unit 203 determines the capacitor screen breakdown defect fault of the oil-immersed paper-filled SF6 valve side bushing based on the judgment result, including:

[0144] Based on the AI ​​model and the DT model, according to the information data, it is judged that the three-phase contrast of the bushing end screen voltage is less than the ninth preset value D9 and the number of capacitor screen breakdowns corresponding to the voltage increase is greater than 1, then it is determined that a local capacitor screen in the oil-immersed paper-filled SF6 valve side bushing has a breakdown defect;

[0145] Based on the AI ​​model and the DT model, according to the information data, determine whether the three-phase ratio of the bushing end screen voltage is less than the tenth preset value D10, and whether the corresponding handover value deviation of the electrical parameter is greater than the eleventh preset value. If both are true, a first evaluation is given, and it is determined that the oil-immersed paper-filled SF6 valve side bushing has a capacitor screen breakdown defect.

[0146] The detection unit 203 is also used for:

[0147] Based on the AI ​​model and the DT model, according to the information data, it is judged that the three-phase contrast of the bushing end screen voltage is less than the ninth preset value D9 and the number of capacitor screen breakdowns corresponding to the voltage increase is greater than 1, then it is determined that a local capacitor screen breakdown defect occurs in the oil-immersed paper-filled SF6 valve side bushing, and a second evaluation is given.

[0148] Among them, the first evaluation includes:

[0149] If there is a device failure, take immediate measures to repair or replace the device.

[0150] The second evaluation includes:

[0151] It is recommended to perform routine inspection or maintenance on the equipment.

[0152] The present invention can determine whether a valve side sleeve fails by judging information data, and has high reliability and efficiency.

[0153] Embodiment 3:

[0154] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, which are suitable for implementing one or more instructions, and are specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of the method in the above embodiment.

[0155] Embodiment 4:

[0156] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in a computer device and, of course, an extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiment.

[0157] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may be in the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present invention may be in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program codes. The scheme in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0158] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0159] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0160] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0161] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0162] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for detecting fault defects of bushings on the valve side of a converter transformer, characterized in that: include: Obtaining information data on the operating status of the bushing on the valve side of the converter inverter; Based on the pre-established artificial intelligence AI model and digital twin DT model, the value of the information data is judged to obtain a judgment result; Based on the judgment result, the fault defect of the valve-side bushing of the converter transformer is determined.

2. The method according to claim 1, characterized in that The valve-side bushing of the converter converter comprises: Oil-impregnated paper filled SF6 valve side bushing and glue-impregnated paper filled SF6 valve side bushing.

3. The method according to claim 1, characterized in that The information data includes: online monitoring data, live detection data, power outage test data and patrol inspection data.

4. The method according to claim 1, characterized in that: Based on the judgment result, the fault defects of the valve side bushing of the converter transformer are determined, including: discharge fault of the oil-impregnated paper-filled SF6 valve side bushing, discharge fault of the rubber-impregnated paper-filled SF6 valve side bushing and capacitor screen breakdown defect fault of the rubber-impregnated paper-filled SF6 valve side bushing.

5. The method according to claim 4, characterized in that Based on the judgment result, the discharge fault of the bushing on the oil-immersed paper-filled SF6 valve side is determined, including: Based on the AI ​​model and the information data, it is determined that the three-phase comparison of the bushing end screen voltage is less than the third preset value D3, and a first evaluation is given; If, based on the information data, it is determined that the SF6 gas composition is abnormal and the bushing electrical parameters are abnormal, then it is determined whether the SO2 and H2S gas concentrations in the SF6 gas in the online monitoring data are greater than 0, and whether the corresponding handover value deviation of the electrical parameters is greater than the fourth preset value D4. If both are true, it is determined that a discharge fault has occurred in the bushing on the oil-immersed paper-filled SF6 valve side.

6. The method according to claim 5, characterized in that The method further comprises: Based on the DT model, according to the information data, it is determined whether the SF6 gas pressure is less than the first preset value D1. If so, a second evaluation is given, and an infrared leakage detection is performed on the oil-immersed paper-filled SF6 valve side bushing. According to the information data, it is determined whether the SF6 gas pressure is less than the second preset value D2. If so, a first evaluation is given, and an infrared leakage detection is performed on the valve side bushing of the converter transformer.

7. The method according to claim 4, characterized in that Based on the judgment result, the discharge fault of the bushing on the side of the SF6-filled rubber-impregnated paper valve is determined, including: Based on the AI ​​model and the information data, it is determined that the three-phase ratio of the bushing end screen voltage is less than the seventh preset value D7, and a first evaluation is given; If the SF6 gas composition and bushing electrical parameters are determined to be abnormal based on the information data, then determine whether the SO2 and H2S gas concentrations in the SF6 gas are greater than 0, and whether the corresponding handover value deviations of the electrical parameters are greater than the eighth preset value D8. If both are true, it is determined that a discharge fault has occurred in the bushing on the oil-immersed paper-filled SF6 valve side.

8. The method according to claim 7, characterized in that The method further comprises: Based on the DT model, according to the information data, determine whether the SF6 gas pressure is less than the fifth preset value D5. If so, give a second evaluation, and perform infrared leakage detection on the oil-immersed paper-filled SF6 valve side casing. According to the information data, determine whether the SF6 gas pressure is less than the sixth preset value D6. If so, give a first evaluation, and perform infrared leakage detection.

9. The method according to claim 4, characterized in that Based on the judgment results, it is determined that the capacitor screen breakdown defect fault of the oil-immersed paper-filled SF6 valve side bushing includes: Based on the AI ​​model and the DT model, according to the information data, it is judged that the three-phase contrast of the bushing end screen voltage is less than the ninth preset value D9 and the number of capacitor screen breakdowns corresponding to the voltage increase is greater than 1, then it is determined that a local capacitor screen in the oil-immersed paper-filled SF6 valve side bushing has a breakdown defect; Based on the AI ​​model and the DT model, according to the information data, determine whether the three-phase ratio of the bushing end screen voltage is less than the tenth preset value D10, and whether the corresponding handover value deviation of the electrical parameter is greater than the eleventh preset value. If both are true, a first evaluation is given, and it is determined that the oil-immersed paper-filled SF6 valve side bushing has a capacitor screen breakdown defect.

10. The method according to claim 9, characterized in that The method further comprises: Based on the AI ​​model and the DT model, according to the information data, it is judged that the three-phase contrast of the bushing end screen voltage is less than the ninth preset value D9 and the number of capacitor screen breakdowns corresponding to the voltage increase is greater than 1, then it is determined that a local capacitor screen breakdown defect occurs in the oil-immersed paper-filled SF6 valve side bushing, and a second evaluation is given.

11. The method according to any one of claims 5 to 9, characterized in that: The first evaluation includes: If there is a device failure, take immediate measures to repair or replace the device.

12. The method according to any one of claims 6, 8 and 10, characterized in that: The second evaluation includes: It is recommended to perform routine inspection or maintenance on the equipment.

13. A system for detecting fault defects of bushings on the valve side of a converter transformer, characterized in that: include: A data acquisition unit, used to obtain information data on the operating status of the bushing on the valve side of the converter; A judgment unit, used to judge the value of the information data based on a pre-established AI model and a DT model, and obtain a judgment result; A detection unit is used to determine the fault defect of the valve-side bushing of the converter transformer based on the judgment result.

14. The system according to claim 13, characterized in that The valve-side bushing of the converter converter comprises: Oil-impregnated paper filled SF6 valve side bushing and glue-impregnated paper filled SF6 valve side bushing.

15. The system according to claim 13, characterized in that The information data includes: online monitoring data, live detection data, power outage test data and patrol inspection data.

16. The system according to claim 13, characterized in that The detection unit determines the fault defects of the valve side bushing of the converter transformer based on the judgment result, including: the discharge fault of the oil-impregnated paper-filled SF6 valve side bushing, the discharge fault of the rubber-impregnated paper-filled SF6 valve side bushing and the capacitor screen breakdown defect fault of the rubber-impregnated paper-filled SF6 valve side bushing.

17. The system according to claim 16, characterized in that The detection unit determines the discharge fault of the oil-immersed paper-filled SF6 valve side bushing based on the judgment result, including: Based on the AI ​​model and the information data, it is determined that the three-phase comparison of the bushing end screen voltage is less than the third preset value D3, and a first evaluation is given; If, based on the information data, it is determined that the SF6 gas composition is abnormal and the bushing electrical parameters are abnormal, then it is determined whether the SO2 and H2S gas concentrations in the SF6 gas in the online monitoring data are greater than 0, and whether the corresponding handover value deviation of the electrical parameters is greater than the fourth preset value D4. If both are true, it is determined that a discharge fault has occurred in the bushing on the oil-immersed paper-filled SF6 valve side.

18. The system according to claim 17, characterized in that The detection unit is also used for: Based on the DT model, according to the information data, it is determined whether the SF6 gas pressure is less than the first preset value D1. If so, a second evaluation is given, and an infrared leakage detection is performed on the oil-immersed paper-filled SF6 valve side bushing. According to the information data, it is determined whether the SF6 gas pressure is less than the second preset value D2. If so, a first evaluation is given, and an infrared leakage detection is performed on the valve side bushing of the converter transformer.

19. The system according to claim 16, characterized in that The detection unit determines the discharge fault of the rubber-impregnated paper SF6-filled valve-side bushing based on the judgment result, including: Based on the AI ​​model and the information data, it is determined that the three-phase ratio of the bushing end screen voltage is less than the seventh preset value D7, and a first evaluation is given; If the SF6 gas composition and bushing electrical parameters are determined to be abnormal based on the information data, then determine whether the SO2 and H2S gas concentrations in the SF6 gas are greater than 0, and whether the corresponding handover value deviations of the electrical parameters are greater than the eighth preset value D8. If both are true, it is determined that a discharge fault has occurred in the bushing on the oil-immersed paper-filled SF6 valve side.

20. The system according to claim 19, characterized in that The detection unit is also used for: Based on the DT model, according to the information data, determine whether the SF6 gas pressure is less than the fifth preset value D5. If so, give a second evaluation, and perform infrared leakage detection on the oil-immersed paper-filled SF6 valve side casing. According to the information data, determine whether the SF6 gas pressure is less than the sixth preset value D6. If so, give a first evaluation, and perform infrared leakage detection.

21. The system according to claim 16, characterized in that The detection unit determines the capacitor screen breakdown defect fault of the oil-immersed paper-filled SF6 valve side bushing based on the judgment result, including: Based on the AI ​​model and the DT model, according to the information data, it is judged that the three-phase contrast of the bushing end screen voltage is less than the ninth preset value D9 and the number of capacitor screen breakdowns corresponding to the voltage increase is greater than 1, then it is determined that a local capacitor screen in the oil-immersed paper-filled SF6 valve side bushing has a breakdown defect; Based on the AI ​​model and the DT model, according to the information data, determine whether the three-phase ratio of the bushing end screen voltage is less than the tenth preset value D10, and whether the corresponding handover value deviation of the electrical parameter is greater than the eleventh preset value. If both are true, a first evaluation is given, and it is determined that the oil-immersed paper-filled SF6 valve side bushing has a capacitor screen breakdown defect.

22. The system according to claim 21, characterized in that The detection unit is also used for: Based on the AI ​​model and the DT model, according to the information data, it is judged that the three-phase contrast of the bushing end screen voltage is less than the ninth preset value D9 and the number of capacitor screen breakdowns corresponding to the voltage increase is greater than 1, then it is determined that a local capacitor screen breakdown defect occurs in the oil-immersed paper-filled SF6 valve side bushing, and a second evaluation is given.

23. The system according to any one of claims 17 to 21, characterized in that: The first evaluation includes: If there is a device failure, take immediate measures to repair or replace the device.

24. The system according to any one of claims 18, 20 and 22, characterized in that The second evaluation includes: It is recommended to perform routine inspection or maintenance on the equipment.

25. A computer device, characterized in that: include: one or more processors; a processor for executing one or more programs; When the one or more programs are executed by the one or more processors, the method according to any one of claims 1 to 12 is implemented.

26. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the method according to any one of claims 1 to 12 is implemented.

Images