Large transformer insulating oil dissolved gas content real-time monitoring method

Abstract

The invention relates to the technical field of transformer monitoring, and provides a large transformer insulating oil dissolved gas content real-time monitoring method, which comprises the steps of installing a chromatography monitoring device host on a transformer for monitoring insulating oil dissolved characteristic gas content data in real time, assembling equipment and chromatography online monitoring system software, the data processing device is used for analyzing and storing the characteristic gas content data, acquiring the real-time data of the dissolved characteristic gas content of the transformer insulating oil through the chromatographic monitoring device, transmitting the real-time data to the equipment and the system software, storing and analyzing the data through the equipment and the system software, and generating a characteristic gas content report according to an analysis result by the system software. And the information is displayed on the terminal equipment in real time. The content of the dissolved gas in the insulating oil is automatically monitored through the chromatographic monitoring device, automation of gas content detection is achieved through matching of matched equipment and a software system, manual (sampling and inspection) operation is completely avoided, a large amount of manpower and materials are saved, and an energy-saving and emission-reducing scheme is effectively applied.

Description

Technical Field

[0001] The invention relates to the technical field of transformer monitoring, and in particular to a real-time monitoring method for dissolved gas content in insulating oil of a large transformer. Background Art

[0002] Monitoring the dissolved gas content in the insulating oil of large transformers is an important part of ensuring the safe and stable operation of the transformer; the gas dissolved in the insulating oil can reflect the health status of the equipment and potential failures.

[0003] According to the current status of chromatographic analysis of large transformer oil in the power plant, it is necessary to manually take oil regularly and take it to the laboratory for chromatographic analysis. In particular, once a latent fault occurs in the transformer, manual continuous sampling and testing are required. The oil collection link, sample preparation link, and oil treatment link after sampling will cause waste of transformer oil and pollution of the environment by transformer oil. The transformer oil chromatography online monitoring system has a fully automated operation throughout the entire experimental process. The oil sample after sampling is processed and returned to the transformer, without loss of transformer oil and pollution to the outside. Since the oil chromatography online monitoring system is automated, it completely avoids manual (sampling and inspection) operations, saving a lot of manpower and materials, and is an effective application of energy-saving and emission reduction solutions. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a real-time monitoring method for the dissolved gas content in the insulating oil of a large transformer, which solves the problems of long offline measurement cycle, large errors in the degassing process and many factors affecting the test method, the inability to detect fast-growing equipment failures in real time and effectively, and the large errors in chromatographic analysis conclusions due to the influence of sampling, storage, transmission and sample preparation.

[0005] To achieve the above purpose, the present invention is implemented by the following technical scheme: A real-time monitoring method for dissolved gas content in insulating oil of a large transformer comprises the following steps:

[0006] S1. Install a chromatographic monitoring device host on the transformer to monitor the content of characteristic gases dissolved in the insulating oil in real time;

[0007] S2. Assemble equipment and chromatographic online monitoring system software for analyzing and storing characteristic gas content data;

[0008] S3. Obtain real-time data of characteristic gas content dissolved in transformer insulating oil through a chromatographic monitoring device and transmit it to the equipment and system software;

[0009] S4. Store and analyze data through equipment and system software;

[0010] S5. The system software generates a characteristic gas content report based on the analysis results and displays it on the terminal device in real time;

[0011] S6. Issue an alarm based on the abnormal results of the analysis and predict the fault area.

[0012] Preferably, the main unit of the chromatographic monitoring device in S1 is installed by means of a bracket, and the installation position does not affect the inspection and maintenance of the transformer.

[0013] Preferably, the chromatographic monitoring device in S1 adopts a circulating oil working mode, the collected oil sample can represent the state of the main oil sample, and the sampling method and oil return do not affect the safe operation of the monitored equipment.

[0014] Preferably, the sampling oil pipe of the chromatographic monitoring device in S1 is made of stainless steel or copper without catalytic elements, and protective components and insulation components such as pipeline heating belts and insulation pipes are installed outside the sampling oil pipe to ensure smooth flow of transformer oil in the pipeline.

[0015] Preferably, the chromatographic monitoring device in S1 includes a gas generator and other devices, which are used as a gas source to generate a gas with a methane content of less than 0.5 μL / L and a carbon dioxide content of less than 25 μL / L.

[0016] Preferably, the characteristic gases in S1 include hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide, and carbon dioxide.

[0017] Preferably, the chromatographic monitoring device in S1 adopts a high-sensitivity microbridge thermal conductivity detector, and the deviation between the monitoring results of the same oil sample under the same test conditions is ≤5% (calculated based on an ethylene gas concentration of 50 μL / L).

[0018] Preferably, the chromatography online monitoring system software in S2 includes software including data acquisition, analysis and diagnosis, WEB browsing, communication and remote transmission, and extended functions.

[0019] Preferably, the monitoring period of the chromatographic monitoring device in S1 is adjustable, and the shortest period is 2 hours.

[0020] Preferably, the time required for the chromatographic monitoring device in S1 to measure the characteristic gas is ≤30 min.

[0021] The present invention provides a real-time monitoring method for dissolved gas content in insulating oil of a large transformer. It has the following beneficial effects:

[0022] The present invention automatically monitors the dissolved gas content of insulating oil through a chromatographic monitoring device, and realizes automation of gas content detection through the cooperation of supporting equipment and software system, completely avoiding manual (sampling and inspection) operations, saving a lot of manpower and materials, and is an effective application of energy-saving and emission reduction solutions.

[0023] The present invention adopts a sampling tube provided by a chromatographic monitoring device and adopts a circulating oil working mode. The collected oil sample should be able to represent the state of the main oil sample. The sampling mode and the return oil do not affect the safe operation of the monitored equipment. The sampled oil sample is returned to the transformer after processing. There is no loss of transformer oil and no pollution to the outside. The protective components installed outside the oil pipe, the pipeline heating belt, the insulation pipe and other insulation components can ensure that the transformer oil flows smoothly in the pipeline.

[0024] The present invention uses a gas generator and other devices as a gas source. The methane content of the generated gas should be less than 0.5μL / L, and the carbon dioxide content should be less than 25μL / L. The service life of the gas generator should be the same as that of the host, which can ensure the accuracy of the detection data. The chromatographic online monitoring device should adopt a high-sensitivity microbridge thermal conductivity detector, and the minimum detection concentration of acetylene reaches 0.2μL / L, which can ensure the accuracy of the detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a flow chart of a method for real-time monitoring of dissolved gas content in insulating oil of a large transformer according to one or more embodiments. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] Embodiment 1:

[0028] like Figure 1As shown, an embodiment of the present invention provides a real-time monitoring method for the dissolved gas content in insulating oil of a large transformer, including installing a chromatographic monitoring device host on the transformer by means of a bracket, the installation position should not affect the inspection and maintenance of the transformer, and the device is used to monitor the dissolved characteristic gas content data of the insulating oil in real time, and the chromatographic online monitoring system software is assembled and installed on the device. The device and the software should have software such as data acquisition, analysis and diagnosis, WEB browsing, communication and remote transmission, as well as expansion functions, etc., and are used to analyze and store characteristic gas content data, obtain the real-time data of the dissolved characteristic gas content of the transformer insulating oil through the chromatographic monitoring device, and transmit it to the device and system software, through The data is stored and analyzed by the equipment and system software. The system software generates a characteristic gas content report based on the analysis results and displays it in real time on the terminal device. If the data is abnormal, an alarm is issued based on the analysis results and the fault area is predicted; the chromatographic monitoring device collects oil samples through a sampling tube connected to the transformer oil tank. The sampling oil tube is set to circulate oil. The collected oil sample can represent the state of the main oil sample. The sampling method and return oil do not affect the safe operation of the monitored equipment. The sample gas is captured by the purge capture method. The sample gas includes hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide, carbon dioxide, etc. The carrier gas is generated by a gas generator Carrying sample gas that is not captured, the chromatographic monitoring device detects oxygen through the high-sensitivity microbridge thermal conductivity detector on board. When the equipment is normal, the same oil sample is tested multiple times at 25 degrees Celsius, and the deviation of the monitoring results is ≤5% (calculated based on an ethylene gas concentration of 50μL / L). The detected data is transmitted to the communication device for storage and recording, and the data is analyzed by the chromatographic online monitoring system software. The analysis results are generated into a gas content report and displayed in real time on the communication device. When abnormal data appears, the alarm system is controlled by the control center to sound an alarm. By analyzing the data, the fault area is predicted and the relevant staff are notified; The monitoring efficiency through the chromatographic detection device is high, and the single monitoring time is less than 30 minutes. Compared with the semi-permeable membrane degassing, the gas-sensitive semiconductor sensor improves the efficiency of the detector by ten times. The sample treatment through the purge and capture method does not require the use of organic solvents, and does not cause secondary pollution to the environment. It has the advantages of small sampling volume, high enrichment efficiency, small matrix interference, and easy online detection. The chromatographic method uses a microbridge detector, which is based on MEMS technology. The TCD uses silicon micromachining technology and precision machining technology to integrate detection circuits including reference cells, detection cells, gas channels, etc. on a silicon chip, and integrates control circuits, I / 0 interfaces, etc. on it. Due to the characteristics of MEMS technology, the volume of TCD made by this technology is very small, which effectively reduces the neutron volume of TCD and greatly improves the sensitivity of TCD. Its sensitivity can reach below 0.5ppm, with high sensitivity and good stability, and combines the common advantages of thermal conductivity and semiconductor detectors.

[0029] Embodiment 2:

[0030] The embodiment of the present invention provides a real-time monitoring method for the dissolved gas content in insulating oil of a large transformer, comprising installing a chromatographic monitoring device host on the transformer by means of a bracket, the installation position should not affect the inspection and maintenance of the transformer, and the device is used for real-time monitoring of the characteristic gas content data dissolved in the insulating oil, and the chromatographic online monitoring system software is assembled and installed on the device; the device and the software should have software such as data acquisition, analysis and diagnosis, WEB browsing, and communication remote transmission, as well as functions such as extended functions, and are used for analyzing and storing characteristic gas content data, obtaining real-time data of the characteristic gas content dissolved in the insulating oil of the transformer through the chromatographic monitoring device, and transmitting it to the device and system software, storing and analyzing the data through the device and the system software, and the system software generating characteristic gas content according to the analysis results. The report is generated and displayed in real time on the terminal device. If the data is abnormal, an alarm is issued based on the analysis results, and the fault area is predicted. The chromatographic monitoring device is set to monitor for a period of 2 hours at the shortest. The chromatographic monitoring device collects oil samples through a sampling tube connected to the transformer oil tank. The sampling oil tube is made of stainless steel or copper that does not contain catalytic elements, and protective components, pipeline heating belts, insulation pipes and other insulation components are installed on the outside of the sampling oil tube to ensure that the transformer oil flows smoothly in the pipeline, thereby avoiding the problem of manual oil spillage and equipment pollution. At the same time, it can improve the efficiency of oil extraction, save time, and reduce the time required for detection. The protective components and insulation components set can ensure the performance of the insulating oil in a low temperature environment and ensure smooth oil extraction.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A real-time monitoring method for dissolved gas content in insulating oil of a large transformer, characterized in that: The following steps are involved: S1. Install a chromatographic monitoring device host on the transformer to monitor the content of characteristic gases dissolved in the insulating oil in real time; S2. Assemble equipment and chromatographic online monitoring system software for analyzing and storing characteristic gas content data; S3. Obtain real-time data of characteristic gas content dissolved in transformer insulating oil through a chromatographic monitoring device and transmit it to the equipment and system software; S4. Store and analyze data through equipment and system software; S5. The system software generates a characteristic gas content report based on the analysis results and displays it on the terminal device in real time; S6. Issue an alarm based on the abnormal results of the analysis and predict the fault area.

2. A real-time monitoring method for dissolved gas content in insulating oil of a large transformer according to claim 1, characterized in that: The main unit of the chromatographic monitoring device in S1 is installed by a bracket, and the installation position does not affect the inspection and maintenance of the transformer.

3. The method for real-time monitoring of dissolved gas content in insulating oil of a large transformer according to claim 1, characterized in that: The chromatographic monitoring device in S1 adopts a circulating oil working mode, and the collected oil sample can represent the state of the main oil sample. The sampling method and oil return do not affect the safe operation of the monitored equipment.

4. The method for real-time monitoring of dissolved gas content in insulating oil of a large transformer according to claim 1, characterized in that: The sampling oil pipe of the chromatographic monitoring device in S1 is made of stainless steel or copper without catalytic elements, and protective components and insulation components such as pipeline heating belts and insulation pipes are installed outside the sampling oil pipe to ensure smooth flow of transformer oil in the pipeline.

5. The method for real-time monitoring of dissolved gas content in insulating oil of a large transformer according to claim 1, characterized in that: The chromatographic monitoring device in S1 includes a gas generator and other devices, which are used as a gas source to generate a gas with a methane content of less than 0.5 μL / L and a carbon dioxide content of less than 25 μL / L.

6. The method for real-time monitoring of dissolved gas content in insulating oil of a large transformer according to claim 1, characterized in that: The characteristic gases in S1 include hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide, and carbon dioxide.

7. The method for real-time monitoring of dissolved gas content in insulating oil of a large transformer according to claim 1, characterized in that: The chromatographic monitoring device in S1 adopts a high-sensitivity microbridge thermal conductivity detector, and the deviation between the monitoring results of the same oil sample under the same test conditions is ≤5% (calculated based on an ethylene gas concentration of 50 μL / L).

8. The method for real-time monitoring of dissolved gas content in insulating oil of a large transformer according to claim 1, characterized in that: The chromatographic online monitoring system software in S2 includes software for data acquisition, analysis and diagnosis, WEB browsing, communication and remote transmission, and extended functions.

9. The method for real-time monitoring of dissolved gas content in insulating oil of a large transformer according to claim 1, characterized in that: The monitoring period of the chromatographic monitoring device in S1 is adjustable, and the shortest period is 2 hours.

10. The method for real-time monitoring of dissolved gas content in insulating oil of a large transformer according to claim 1, characterized in that: The time required for the chromatographic monitoring device in S1 to measure the characteristic gas is ≤30min.

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