Method for judging fault and severity of C4F7N / CO2 / O2 gas insulated electrical equipment based on characteristic decomposition components
Through the characteristic decomposition component analysis method, the gas components in C4F7N/CO2/O2 gas insulated electrical equipment are monitored, which solves the problem of difficult to judge the type and severity of the equipment, and achieves fault detection with higher sensitivity and reliability.
Patent Information
- Application Number
- CN202411565907.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-03-07
AI Technical Summary
It is difficult for the prior art to effectively monitor and judge the fault types and severity of C4F7N/CO2/O2 gas-insulated electrical equipment, especially during the long-term operation of the equipment, the fault types are diverse and the severity is complex.
Using a method based on feature decomposition component analysis, the gas in the equipment is sampled every 2 hours, and the gas chromatograph is used to analyze the content of characteristic components in the gas sample to determine the type and severity of the equipment.
It realizes the early and accurate identification of the faults of C4F7N/CO2/O2 gas-insulated electrical equipment and the accurate judgment of the severity of severity, improving the sensitivity and reliability of fault detection.
Smart Images
Figure CN119574723A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of environmentally friendly insulating gas power equipment fault monitoring, and in particular to a method for analyzing the fault and severity of C4F7N / CO2 / O2 gas insulated electrical equipment based on characteristic decomposition components. Background Art
[0002] SF6's excellent arc extinguishing performance makes it widely used in high-voltage electrical equipment. At the same time, SF6 is one of the most potent greenhouse gases known, with a global warming potential (GWP) of about 23,900 and a very long life in the atmosphere, which means that once SF6 is emitted into the atmosphere, it will exist for a long time and continue to affect the climate. Perfluoroisobutyronitrile (C4F7N) has an insulation performance of about 2.2 times that of SF6, and its GWP value and atmospheric life are significantly reduced, making it one of the most promising environmentally friendly insulating gases.
[0003] In practical applications, C4F7N is often mixed with CO2 and O2 to meet the liquefaction temperature requirements of engineering applications. As an environmentally friendly alternative gas, C4F7N / CO2 / O2 is increasingly being used in gas-insulated electrical equipment. It has been widely used due to its advantages such as small footprint, long maintenance cycle, and high equipment reliability. However, various types of faults are inevitable during the long-term operation of the equipment. Rapid and reasonable judgment of the type of fault is conducive to maintenance personnel to quickly select appropriate countermeasures to avoid further development of the fault.
[0004] Generally, the fault types of gas-insulated electrical equipment can be mainly summarized into two categories: discharge fault and thermal fault. Discharge fault can be further divided into partial discharge (PD) fault and breakdown fault. The mainstream fault judgment method is to monitor the electrical signal and temperature distribution of the equipment. For C4F7N / CO2 / O2 gas, when the equipment fails, it will cause a series of decomposition reactions in the gas. By monitoring the characteristic decomposition components of different faults, the fault type and severity of the equipment can be determined. Compared with the monitoring of electrical signals and temperature distribution, monitoring the fault state by decomposition components has higher sensitivity for early fault detection, and the decomposition component detection is less affected by external electromagnetic interference, which can provide more reliable fault information. Therefore, a method for analyzing the fault and severity of C4F7N / CO2 / O2 gas-insulated electrical equipment based on characteristic decomposition components is proposed, which is conducive to the further application of C4F7N / CO2 / O2 in gas-insulated electrical equipment. Summary of the invention
[0005] The object of the present invention is to solve the deficiencies of the above-mentioned prior art, thereby providing a method for analyzing the fault and severity of C4F7N / CO2 / O2 gas-insulated electrical equipment based on characteristic decomposition components, and based on this method, real-time monitoring of the gas components and contents in the gas-insulated electrical equipment, thereby quickly determining the fault type of the equipment and providing a basis for subsequent maintenance work.
[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a method for analyzing the fault and severity of C4F7N / CO2 / O2 gas-insulated electrical equipment based on characteristic decomposition components, wherein the analysis method determines the fault condition of the equipment by real-time monitoring the content and change trend of C4F7N / CO2 / O2 gas decomposition components in C4F7N / CO2 / O2 gas-insulated electrical equipment, and comprises the following steps: (1) Sample the gas in C4F7N / CO2 / O2 gas-insulated electrical equipment every 2 hours; (2) Use gas chromatograph to analyze the gas sample components and the content of each component and record them, and extract the characteristic component content for analysis; (3) Determine the fault type of C4F7N / CO2 / O2 gas-insulated electrical equipment using the characteristic component content in the gas sample; (4) According to the fault type, the fault degree of C4F7N / CO2 / O2 gas-insulated electrical equipment is determined by using the content of characteristic components in the gas sample.
[0007] The sample was 0.5 mL.
[0008] Step (3) includes: For C4F7N / CO2 / O2 gas-insulated electrical equipment, if the gas sample is not decomposed, the C4F7N / CO2 / O2 gas-insulated electrical equipment operates normally; if decomposition of the gas sample is detected, the fault type is determined according to the decomposition components, specifically: If C2F6 or C3F6 appears in the decomposition components and its content is less than 10ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a discharge fault; If C2F6 or C3F6 appears in the decomposition components and its content is less than 10ppm, and C2F6O3 components appear, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a PD fault; If C2F6 or C3F6 appears in the decomposition components and its content is less than 10ppm, and the amount of CF4 generated is detected to be greater than 100ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a breakdown fault; If C2F6 does not appear in the decomposition components but other decomposition products are detected, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a thermal fault.
[0009] Step (4) includes: Determine the severity of the fault by monitoring the changes in the contents of CF4, COF2, C2N2, and C2F5CN; When the fault type of C4F7N / CO2 / O2 gas-insulated electrical equipment is PD fault, pay attention to the content of CF4 in the gas sample, and judge that the PD fault is more serious; When the fault type of C4F7N / CO2 / O2 gas-insulated electrical equipment is a thermal fault, pay attention to the contents of COF2, C2N2, and C2F5CN in the gas sample to determine the severity of the thermal fault.
[0010] When the fault type of C4F7N / CO2 / O2 gas-insulated electrical equipment is PD fault, pay attention to the content of CF4 in the gas sample. The more serious the PD fault is, the more serious it is: When the amount of CF4 generated is between 0 and 5 ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a minor PD fault; When the amount of CF4 generated is between 5 and 20 ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a moderate PD fault; When the amount of CF4 generated is between 20 and 30 ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a serious PD fault; When the amount of CF4 generated is greater than 100ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a breakdown failure.
[0011] When the fault type of C4F7N / CO2 / O2 gas-insulated electrical equipment is a thermal fault, pay attention to the contents of COF2, C2N2, and C2F5CN in the gas sample to determine the severity of the thermal fault, specifically: When the COF2 peak area is detected in the range of 0~4.0×10 5 , the C2N2 peak area is 0~3.0×10 5 When the peak area of C2F5CN is between 0 and 9.0×10 3 When the C4F7N / CO2 / O2 gas-insulated electrical equipment is considered to have a slight overheating fault; When the COF2 peak area was detected at 4.0×10 5 ~8.0×10 5 , the C2N2 peak area is 3.0×10 5 ~1.2×10 6 When the peak area of C2F5CN is between 0 and 9.0×10 3 When the C4F7N / CO2 / O2 gas-insulated electrical equipment is considered to have a moderate overheating fault; When the COF2 peak area was detected at 8.0×10 5 ~1.2×10 6 , the C2N2 peak area is 1.2×10 6 ~2.4×10 6 When the peak area of C2F5CN is between 0 and 9.0×10 3 When the C4F7N / CO2 / O2 gas-insulated electrical equipment is considered to have a serious overheating fault; When the COF2 peak area is greater than 1.2×10 6 , the C2N2 peak area is greater than 3.0×10 6 When the peak area of C2F5CN is greater than 1.2×10 4 When the C4F7N / CO2 / O2 gas insulated electrical equipment is faulty due to critical overheating.
[0012] The present invention judges the fault and severity through characteristic decomposition components, and has the following advantages compared with other traditional fault identification methods: 1. Real-time monitoring and prediction capabilities. Based on the characteristic decomposition components, the decomposition of gases in C4F7N / CO2 / O2 gas-insulated electrical equipment can be analyzed more accurately, and trace amounts of decomposed gases can be detected earlier, thereby achieving more sensitive fault identification. Compared with traditional temperature or current abnormality monitoring, the gas decomposition components can directly reflect the internal insulation status and improve the accuracy of fault detection; 2. Applicable to a variety of working conditions. Monitoring can be achieved whether the equipment is in operation or during power outages and maintenance. Compared with the single physical quantity monitoring method, it is not significantly affected by external conditions such as temperature and humidity, and has stronger adaptability. 3. Accurate identification of fault type and severity. The decomposition component analysis can distinguish different types of faults, and determine the severity of the fault by the component concentration level, providing support for fault location and classification. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 Schematic diagram for analyzing the fault and severity of C4F7N / CO2 / O2 gas-insulated electrical equipment based on characteristic decomposition components.
[0014] Figure 2 This is a flow chart for analyzing the faults and severity of C4F7N / CO2 / O2 gas-insulated electrical equipment based on characteristic decomposition components. DETAILED DESCRIPTION
[0015] The following are examples and the attached Figure 1-2 The technical solution of the present invention is further specifically described.
[0016] As attached Figure 1As shown, 0.5 mL of gas was extracted from the equipment at intervals of 2 hours, and a gas chromatograph (GC-MS) was used to monitor the gas components in the C4F7N / CO2 / O2 gas-insulated electrical equipment in real time, with a focus on monitoring the content changes of C2F6, C2F6O3, C3F6, CF4, COF2, C2N2, and C2F5CN in the equipment. The type of equipment failure and its severity were determined by the content of the characteristic decomposition components.
[0017] The specific judgment process is as follows Figure 2 As shown, when C2F6 or C3F6 appears in the system and its content is less than 10ppm, it is considered that a discharge fault occurs in the C4F7N / CO2 / O2 gas-insulated electrical equipment.
[0018] When a discharge fault is considered to occur in C4F7N / CO2 / O2 gas-insulated electrical equipment, if the C2F6O3 component is detected, it is considered that a partial discharge (PD) fault has occurred in the equipment. When a PD fault occurs in the equipment, attention should be paid to the CF4 content in the equipment. The higher the CF4 content, the more serious the PD fault.
[0019] A method for analyzing the fault and severity of C4F7N / CO2 / O2 gas-insulated electrical equipment based on characteristic decomposition components mainly includes the following steps: (1) Real-time monitoring of the gas composition of C4F7N / CO2 / O2 gas-insulated electrical equipment. Every 2 hours, 0.5 mL of C4F7N / CO2 / O2 gas in the equipment was sampled.
[0020] (2) Use gas chromatograph (GC-MS) to analyze the component content of gas samples, record the content of each component, and analyze the content of key characteristic decomposition components.
[0021] The chromatographic carrier gas of the gas chromatograph (GC-MS) was helium with a purity of not less than 99.999%, and the carrier gas flow rate was set to 1.2 mL / min. The chromatographic column box temperature was initially set to 50°C, maintained for 2 minutes, then increased to 200°C at 10°C / min, and finally maintained for 10 minutes. The gas inlet split ratio was set to 10:1.
[0022] Inject 0.5 mL of pure gas of C2F6, C2F6O3, C3F6, CF4, COF2, C2N2, and C2F5CN respectively for calibration.
[0023] Inject the extracted sample into the GC-MS, wait for the analysis to be completed, use calibrated pure gas to perform peak integration analysis on each characteristic product in the sample to obtain the content of each characteristic product.
[0024] (3) Use characteristic products to determine the fault type of C4F7N / CO2 / O2 gas-insulated electrical equipment.
[0025] For C4F7N / CO2 / O2 gas-insulated electrical equipment, if the gas sample is not decomposed, the C4F7N / CO2 / O2 gas-insulated electrical equipment operates normally; if decomposition of the gas sample is detected, the fault type is determined according to the decomposition components, specifically: When C2F6 or C3F6 appears in the system and its content is less than 10ppm, it is considered that the C4F7N / CO2 / O2 gas insulated electrical equipment has a discharge failure.
[0026] When the device is considered to have a discharge failure, if the C2F6O3 component is detected, it is considered to have a PD failure; When it is detected that the generation amount of CF4 is greater than 100ppm, it is considered that the device has a breakdown failure.
[0027] When C2F6 does not appear in the system but other decomposition products are detected, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a thermal failure.
[0028] (4) Use the content of characteristic products to determine the degree of equipment failure.
[0029] Determine the severity of the fault by monitoring the changes in the contents of CF4, COF2, C2N2, and C2F5CN; When a discharge failure occurs in C4F7N / CO2 / O2 gas insulated electrical equipment, detect the generation amount of CF4: When the CF4 generation amount is 0~5 ppm, it is believed that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a slight PD failure. At this time, the discharge phenomenon occasionally occurs, but it has little impact on the function of the equipment. You can choose to observe further.
[0030] When the amount of CF4 generated is between 5 and 20 ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a moderate PD fault. At this time, the discharge phenomenon is frequent and may cause a slight degradation of the equipment performance. Regular inspection and maintenance are required to avoid further deterioration.
[0031] When the amount of CF4 generated is between 20 and 30 ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a serious PD fault. At this time, the discharge phenomenon persists, which has a significant impact on the performance of the equipment and may cause damage or failure of the equipment, requiring immediate repair measures.
[0032] When the amount of CF4 generated is greater than 100 ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a breakdown fault. This may cause immediate equipment failure or dangerous accidents, and the equipment must be shut down for inspection and maintenance immediately to prevent serious consequences.
[0033] When an overheating failure occurs in C4F7N / CO2 / O2 gas insulated electrical equipment, detect the content of COF2, C2N2, and C2F5CN: When the COF2 peak area is detected in the range of 0~4.0×10 5 , the C2N2 peak area is 0~3.0×10 5 The peak area of C2F5CN is between 0 and 9.0×10 3 At that time, it is believed that the C4F7N / CO2 / O2 gas insulated electrical equipment has a slight overheating failure. At this time, the equipment is operating normally with a slightly exceeding the standard and has no significant impact on performance. It is recommended to monitor the temperature change.
[0034] When the COF2 peak area was detected at 4.0×10 5 ~8.0×10 5 , the C2N2 peak area is 3.0×10 5 ~1.2×10 6 The peak area of C2F5CN is between 0 and 9.0×10 3 At that time, it is believed that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a moderate overheating failure. At this time, the temperature significantly exceeds the standard may affect the performance of the equipment. It is recommended to conduct an inspection and the heat dissipation system or load may need to be adjusted.
[0035] When the COF2 peak area was detected at 8.0×10 5 ~1.2×10 6 , the C2N2 peak area is 1.2×10 6 ~2.4×10 6 The peak area of C2F5CN is between 0 and 9.0×10 3 When the temperature exceeds the standard, the performance of the equipment is obviously reduced, which may cause damage to some components. It is necessary to take immediate measures to reduce the temperature.
[0036] When the COF2 peak area is greater than 1.2×10 6 , the C2N2 peak area is greater than 3.0×10 6 , the peak area of C2F5CN is greater than 1.2×10 4 When the C4F7N / CO2 / O2 gas insulated electrical equipment is considered to have a critical overheating fault, the equipment is overheated to a critical point, which may cause a fire or other serious accidents. It must be shut down immediately and undergo a comprehensive inspection and repair.
Claims
1. A method for analyzing the fault and severity of C4F7N / CO2 / O2 gas-insulated electrical equipment based on characteristic decomposition components, wherein the analysis method determines the fault condition of the equipment by real-time monitoring the content and change trend of C4F7N / CO2 / O2 gas decomposition components in C4F7N / CO2 / O2 gas-insulated electrical equipment, and is characterized by: The following steps are involved: (1) Sample the gas in C4F7N / CO2 / O2 gas-insulated electrical equipment every 2 hours; (2) Use gas chromatograph to analyze the gas sample components and the content of each component and record them, and extract the characteristic component content for analysis; (3) Determine the fault type of C4F7N / CO2 / O2 gas-insulated electrical equipment using the characteristic component content in the gas sample; (4) According to the fault type, the fault degree of C4F7N / CO2 / O2 gas-insulated electrical equipment is determined by using the content of characteristic components in the gas sample.
2. The method for analyzing the fault and severity of C4F7N / CO2 / O2 gas-insulated electrical equipment based on characteristic decomposition components according to claim 1 is characterized in that: The sample was 0.5 mL.
3. The method for analyzing the fault and severity of C4F7N / CO2 / O2 gas-insulated electrical equipment based on characteristic decomposition components according to claim 1 is characterized in that: Step (3) includes: For C4F7N / CO2 / O2 gas-insulated electrical equipment, if the gas sample is not decomposed, the C4F7N / CO2 / O2 gas-insulated electrical equipment operates normally; if decomposition of the gas sample is detected, the fault type is determined according to the decomposition components, specifically: If C2F6 or C3F6 appears in the decomposition components and its content is less than 10ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a discharge fault; If C2F6 or C3F6 appears in the decomposition components and its content is less than 10ppm, and C2F6O3 components appear, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a PD fault; If C2F6 or C3F6 appears in the decomposition components and its content is less than 10ppm, and the amount of CF4 generated is detected to be greater than 100ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a breakdown fault; If C2F6 does not appear in the decomposition components but other decomposition products are detected, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a thermal fault.
4. The method for analyzing the fault and severity of C4F7N / CO2 / O2 gas-insulated electrical equipment based on characteristic decomposition components according to claim 3 is characterized in that: Step (4) includes: Determine the severity of the fault by monitoring the changes in the contents of CF4, COF2, C2N2, and C2F5CN; When the fault type of C4F7N / CO2 / O2 gas-insulated electrical equipment is PD fault, pay attention to the content of CF4 in the gas sample, and judge that the PD fault is more serious; When the fault type of C4F7N / CO2 / O2 gas-insulated electrical equipment is a thermal fault, pay attention to the contents of COF2, C2N2, and C2F5CN in the gas sample to determine the severity of the thermal fault.
5. The method for analyzing the fault and severity of C4F7N / CO2 / O2 gas-insulated electrical equipment based on characteristic decomposition components according to claim 4 is characterized in that: When the fault type of C4F7N / CO2 / O2 gas-insulated electrical equipment is PD fault, pay attention to the content of CF4 in the gas sample. The more serious the PD fault is, the more serious it is: When the amount of CF4 generated is between 0 and 5 ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a minor PD fault; When the amount of CF4 generated is between 5 and 20 ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a moderate PD fault; When the amount of CF4 generated is between 20 and 30 ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a serious PD fault; When the amount of CF4 generated is greater than 100ppm, it is considered that the C4F7N / CO2 / O2 gas-insulated electrical equipment has a breakdown failure.
6. The method for analyzing the fault and severity of C4F7N / CO2 / O2 gas-insulated electrical equipment based on characteristic decomposition components according to claim 4 is characterized in that: When the fault type of C4F7N / CO2 / O2 gas-insulated electrical equipment is a thermal fault, pay attention to the contents of COF2, C2N2, and C2F5CN in the gas sample to determine the severity of the thermal fault, specifically: When the COF2 peak area is detected in the range of 0~4.0×10 5 , the C2N2 peak area is 0~3.0×10 5 When the peak area of C2F5CN is between 0 and 9.0×10 3 When the C4F7N / CO2 / O2 gas-insulated electrical equipment is considered to have a slight overheating fault; When the COF2 peak area was detected at 4.0×10 5 ~8.0×10 5 , the C2N2 peak area is 3.0×10 5 ~1.2×10 6 When the peak area of C2F5CN is between 0 and 9.0×10 3 When the C4F7N / CO2 / O2 gas-insulated electrical equipment is considered to have a moderate overheating fault; When the COF2 peak area was detected at 8.0×10 5 ~1.2×10 6 , the C2N2 peak area is 1.2×10 6 ~2.4×10 6 When the peak area of C2F5CN is between 0 and 9.0×10 3 When the C4F7N / CO2 / O2 gas-insulated electrical equipment is considered to have a serious overheating fault; When the COF2 peak area is greater than 1.2×10 6 , the C2N2 peak area is greater than 3.0×10 6 When the peak area of C2F5CN is greater than 1.2×10 4 When the C4F7N / CO2 / O2 gas insulated electrical equipment is faulty due to critical overheating.