Device for detecting gas in oil based on laser photoacoustic spectrometry
By adopting a detection device based on laser photoacoustic spectroscopy in the transformer oil, combined with H2 sensors and full-component chromatography detection system, the problem of detecting hydrogen and acetylene in the transformer oil in the prior art is solved, and fast and accurate fault diagnosis and prediction are achieved.
Patent Information
- Application Number
- CN202421759268.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-24
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-07-24
AI Technical Summary
The prior art is difficult to quickly and accurately detect dissolved hydrogen and acetylene in transformer oil, affecting the accuracy of fault diagnosis and prediction.
The oil gas detection device based on laser photoacoustic spectroscopy is adopted, combined with the fusion structure of the H2 sensor, the gas rapid detection system and the full-component chromatography detection system, to achieve rapid and accurate detection of the gas in the transformer oil.
It realizes rapid detection of hydrogen and acetylene in transformer oil, improves the accuracy of fault diagnosis and prediction, and meets the needs of transformer status maintenance.
Smart Images
Figure CN223037780U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transformer gas detection, in particular to an oil gas detection device based on laser photoacoustic spectroscopy. Background Art
[0002] As a core device of the power grid, the operating state of a transformer is a key link in the reliability of power grid power supply. For the currently widely used oil-immersed transformers, when thermal faults, discharge faults, or oil and paper aging occur inside, a variety of gases will be generated, mainly hydrogen, hydrocarbon gases (methane, ethane, ethylene, acetylene, propane, propylene, etc.), carbon monoxide, carbon dioxide, etc. As the fault develops, the bubbles formed by these decomposed gases undergo convection and diffusion in the oil and continuously dissolve in the oil. Using the method of analyzing dissolved gases in transformer oil to diagnose and predict transformer faults is the main technical means to achieve the condition-based maintenance of transformers at present. The composition and content of the gases generated by transformer faults are one of the main bases for judging the fault type. Hydrogen and acetylene in the oil are important characteristic gases, which can reflect the early discharge faults of transformers. Timely and accurately detecting hydrogen and acetylene dissolved in insulating oil is an effective method for predicting potential internal faults and early diagnosing the development of electrical equipment.
[0003] The transformer oil chromatograph intensive care device developed by our company integrates a real-time monitoring system, an acetylene rapid detection system, and a full-component gas chromatography detection system. Among them, the acetylene rapid detection system uses laser-based photoacoustic spectroscopy detection technology, and the result of acetylene can be obtained in the shortest detection cycle of 3 minutes. The full-component gas chromatography detection system realizes the detection of eight components in transformer oil. This system conducts real-time analysis, real-time monitoring, and real-time diagnosis of the gas content in transformer oil. Its application is of great significance for timely discovering internal faults of transformers and avoiding accidents, and leads the development direction of on-line monitoring technology for transformer oil chromatography. Summary of the Utility Model
[0004] In view of the above situation, to overcome the defects of the prior art, the utility model provides an oil gas detection device based on laser photoacoustic spectroscopy, effectively solving the problems existing in the prior art on the market.
[0005] The technical solution adopted by the utility model is as follows: The oil gas detection device based on laser photoacoustic spectroscopy of the utility model includes a transformer interface flange and a communication module, and further includes a fusion structure of H2 sensors, a gas rapid detection system, and a full-component chromatographic detection system. The fusion structure of H2 sensors is arranged on one side of the transformer interface flange, and an oil inlet pipe is arranged at the other end of the fusion structure of H2 sensors. The gas rapid detection system is arranged at the other end of the oil inlet pipe, and the full-component chromatographic detection system is arranged inside the gas rapid detection system. A return oil pipe is arranged on the other side of the gas rapid detection system.
[0006] As a further solution of the present utility model: one end of the transformer interface flange is connected with an oil inlet pipe, and the other end of the oil inlet pipe is connected to the fusion structure of the H2 sensor.
[0007] As a further solution of the present utility model: the gas rapid detection system adopts vacuum dynamic headspace degassing technology.
[0008] As a further solution of the present utility model: there are two groups of oil tanks inside the gas rapid detection system, and the two groups of oil tanks are used alternately.
[0009] As a further solution of the present utility model: the full-component chromatographic detection system adopts vacuum dynamic headspace degassing technology and a high-sensitivity micro-bridge detector.
[0010] As a further solution of the present utility model: both the oil inlet pipe and the oil return pipe are connected by copper pipes.
[0011] As a further solution of the present utility model: the communication module is electrically connected to the fusion structure of the H2 sensor, the gas rapid detection system, and the full-component chromatographic detection system respectively through transmission wires.
[0012] The beneficial effects achieved by the present utility model with the above structure are as follows:
[0013] First, the transformer oil sampling adopts an oil circulation method, and the oil sample is collected through a high-precision oil gauge, and
[0014] in the separation system, the oil sample is quantitatively calibrated through a high-precision oil sample detection system, and the quantitative consistency of the oil sample is ensured through double calibration;
[0015] Second, the oil-gas separation device adopts a unique constant-temperature vacuum oscillation degassing method, which can quickly separate the gas in the oil. Combined with the automatic sampling method, it fully meets the timeliness requirements of on-line detection;
[0016] Third, it has the function of intelligent carrier gas pressure and flow monitoring. When the pressure or flow exceeds the preset range, the microcomputer control system will automatically cut off the bridge current to protect the thermal conductivity detector from being burned out;
[0017] Fourth, the high-sensitivity micro-current amplification technology greatly improves the sensitivity of the FID; the wide-range FID can analyze samples in a very wide concentration range without changing the range;
[0018] Fifth, the wide-range FID can analyze samples in a very wide concentration range without changing the range;
[0019] V. The compressed air generated by the system can obtain the clean background gas required by the system after a series of automatic maintenance-free gas treatments, avoiding the need for regular replacement of the background gas. Multiple technologies are used to remove hydrocarbons from the background gas to meet the zero-grade air standard, effectively ensuring the use accuracy of the gas chromatograph;
[0020] VI. It can filter out fine impurities in the oil sample, clean the transformer oil sample, ensure the safety of the system oil circuit, reduce equipment damage, and also play a certain role in protecting the transformer. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 FIG. is the full-component chromatographic detection - gas circuit diagram of the oil-in-gas detection device based on laser photoacoustic spectroscopy of the present utility model;
[0022] Figure 2 FIG. is the overall structure diagram of the oil-in-gas detection device based on laser photoacoustic spectroscopy of the present utility model;
[0023] Figure 3 FIG. is the working flow chart of the oil-in-gas detection device based on laser photoacoustic spectroscopy of the present utility model.
[0024] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0025] Reference to an embodiment herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present utility model. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.
[0026] As Figures 1-3 shown, the oil-in-gas detection device based on laser photoacoustic spectroscopy of the present utility model includes a transformer interface flange and a communication module, and further includes a fusion structure of H2 sensors, a gas rapid detection system, and a full-component chromatographic detection system. The fusion structure of H2 sensors is provided on one side of the transformer interface flange, and an oil inlet pipe is provided at the other end of the fusion structure of H2 sensors. The gas rapid detection system is provided at the other end of the oil inlet pipe. The full-component chromatographic detection system is provided inside the gas rapid detection system. A return oil pipe is provided on the other side of the gas rapid detection system.
[0027] One end of the transformer interface flange is connected to an oil inlet pipe, and the other end of the oil inlet pipe is connected to the fusion structure of H2 sensors.
[0028] The gas rapid detection system adopts the vacuum dynamic headspace degassing technology. The components in the oil are extracted multiple times. Therefore, this technology has the advantages of high degassing efficiency, short time, good repeatability, etc., and can greatly improve the analysis accuracy of components with low concentrations. The laser photoacoustic spectroscopy technology is used to measure the gas content. Therefore, it does not have the disadvantages of traditional chromatographic columns and problems such as chromatographic column aging, pollution, and saturation. The narrow linewidth of the laser light source avoids cross-interference during the measurement of fault gases. The system does not require carrier gas or calibration gas during operation.
[0029] Two groups of oil tanks are provided inside the gas rapid detection system. The two groups of oil tanks are used alternately, with a response time of 6 minutes, realizing the shortest detection cycle of 3 minutes, meeting the on-site use requirements of rapid and repeatable detection.
[0030] The full-component chromatographic detection system adopts the vacuum dynamic headspace (purge-and-trap) degassing technology and a high-sensitivity micro-bridge detector, completing the acquisition and analysis process in 40 minutes, and realizing the detection of eight components in transformer oil (H2, CO, CO2, CH4, C2H4, C2H6, C2H2, H2O).
[0031] Both the inlet pipe and the return pipe are connected by copper pipes, which are used for the pipeline connection of oil inlet and oil return between the transformer and the system body.
[0032] The communication module is electrically connected to the fusion structure of the H2 sensor, the gas rapid detection system, and the full-component chromatographic detection system through transmission wires respectively, supporting multiple communication methods, including MODBUS, GPRS, IEC60870-5-104, IEC61850, using a unified data model, service model, and standard transmission protocol, realizing the functions of measuring data transmission, remote monitoring, and control of the equipment.
[0033] When there is an instantaneous power interference, the microcomputer system can automatically save the control parameters and automatically restore the parameters after the interference. Adopting a large-capacity FLASH memory system can ensure that all parameters are not lost during power-off, and even power fluctuations or instantaneous power-off will not affect the normal operation of the instrument.
[0034] The system has a self-diagnosis function. When the temperature control platinum resistance is short-circuited, open-circuited, or the temperature of a certain path exceeds the set protection value, the microcomputer system will automatically turn off the heating switch, and at the same time display the fault location and fault type. In addition, it has a dual over-temperature protection function to ensure that the temperature will not get out of control.
[0035] A high-precision flowmeter is installed at the oil inlet. It ensures the accuracy and stability of the oil sample intake for degassing. It can still have high accuracy when the oil has poor fluidity at a lower temperature. By monitoring the pressure, flow rate, and temperature of the oil circuit, the external environment detection ability of the equipment oil circuit can be further improved to avoid false alarms.
[0036] The detection data error will change with the offset of the retention time of the peak diagram. The system automatically corrects the retention time through high-precision sensors and algorithms, thereby ensuring the accuracy and stability of the data.
[0037] The oil and gas in the separated gas sample are isolated through a gas sample filtration device to avoid the contamination of the chromatographic column by oil and gas and improve the service life of the chromatographic column.
[0038] The system is standard-equipped with an oil sample calibration detection interface. As long as the standard oil is connected to the dedicated interface, the machine will automatically perform the whole process analysis. The K coefficient can be appropriately corrected according to the results to make the accuracy of the machine higher.
[0039] During specific use, the system uses an H2 sensor to monitor the hydrogen in the transformer oil in real time and performs oil inlet and outlet operations regularly to prevent the dead oil area from occurring in the transformer oil at the flange part, resulting in inaccurate H2 monitoring data. When the change in the H2 content is abnormal, the gas rapid detection system is turned on, and multiple alternating detections are carried out to quickly detect the gas content result and send it to the background; and when the gas value is also abnormal, the full-component chromatographic detection is turned on, and the comprehensive diagnosis result is sent to the background.
[0040] When the H2 content is normal, the gas rapid detection and full-component chromatographic detection are regularly turned on inside the system; under normal circumstances, the gas rapid detection system is turned on once every 1 day, and the full-component chromatographic detection system is turned on once every 7 days.
[0041] The above is the overall working process of the present utility model. Just repeat this step the next time it is used.
[0042] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.
[0043] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.
[0044] The above embodiments are provided for those skilled in the art to implement or use the present utility model. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the idea of the present utility model. Therefore, the protection scope of the present utility model is not limited by the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.
Claims
1. A gas-in-oil detection device based on laser photoacoustic spectroscopy, comprising a transformer interface flange and a communication module, characterized in that: It also includes a fusion structure of an H2 sensor, a gas rapid detection system and a full-component chromatography detection system. The fusion structure of the H2 sensor is arranged on one side of the transformer interface flange, an oil inlet pipe is arranged at the other end of the fusion structure of the H2 sensor, the gas rapid detection system is arranged at the other end of the oil inlet pipe, a full-component chromatography detection system is arranged inside the gas rapid detection system, and an oil return pipe is arranged on the other side of the gas rapid detection system.
2. The oil-gas detection device based on laser photoacoustic spectroscopy according to claim 1 is characterized in that: One end of the transformer interface flange is connected to an oil inlet pipe, and the other end of the oil inlet pipe is connected to the fusion structure of the H2 sensor.
3. The oil-gas detection device based on laser photoacoustic spectroscopy according to claim 2 is characterized in that: The gas rapid detection system adopts vacuum dynamic headspace degassing technology.
4. The oil-gas detection device based on laser photoacoustic spectroscopy according to claim 3 is characterized in that: The gas rapid detection system is internally provided with two groups of oil tanks, and the two groups of oil tanks are used alternately.
5. The oil-gas detection device based on laser photoacoustic spectroscopy according to claim 4 is characterized in that: The full-component chromatography detection system adopts vacuum dynamic headspace degassing technology and a high-sensitivity microbridge detector.
6. The oil-gas detection device based on laser photoacoustic spectroscopy according to claim 5 is characterized in that: The oil inlet pipe and the oil return pipe are both connected by copper pipes.
7. The oil-gas detection device based on laser photoacoustic spectroscopy according to claim 6 is characterized in that: The communication module is electrically connected to the fusion structure of the H2 sensor, the gas rapid detection system and the full component chromatographic detection system through conductive lines.