Detection system for components of sulfur hexafluoride mixed insulating gas decomposition product

Abstract

The invention relates to a detection system for components of a sulfur hexafluoride mixed insulating gas decomposition product, belongs to the technical field of electrical equipment insulating gas detection, and particularly relates to the detection system for the components of the sulfur hexafluoride mixed insulating gas decomposition product. The invention aims to solve the technical problems of low detection efficiency, insufficient detection precision, single function and weak anti-interference capability of the existing SF6 mixed insulating gas decomposition product component detection device. The detection system for the components of the sulfur hexafluoride mixed insulating gas decomposition product comprises a sampling unit, a preprocessing unit, a detection unit and a data processing and control unit. According to the system, through modular design, multi-sensor fusion and an intelligent algorithm, high-precision and rapid detection of SF6 mixed gas decomposition products is achieved, and the strict requirement of the power industry for equipment insulation state monitoring is met.

Description

Technical Field

[0001] The invention belongs to the technical field of insulating gas detection of electric power equipment, and in particular relates to a detection system for components of decomposition products of sulfur hexafluoride mixed insulating gas. Background Art

[0002] Sulfur hexafluoride (SF6) gas is widely used in high-voltage electrical equipment due to its excellent insulation and arc-extinguishing properties. However, during the long-term operation of the equipment, affected by factors such as partial discharge, high temperature, and arcing, SF6 gas and its decomposition products will chemically react with impurities such as moisture and oxygen inside the equipment to produce decomposition products such as SO2, H2S, CF4, SOF2, and SO2F2. The type and content changes of these decomposition products can directly reflect the insulation status and fault type inside the equipment. Therefore, it is crucial to detect the decomposition products of SF6 mixed insulating gas. Currently, the existing detection technology has the following main problems:

[0003] Low detection efficiency: Traditional detection methods mostly use offline sampling and testing. After the gas samples are sent to the laboratory, they are analyzed using large equipment such as gas chromatographs. The entire process is time-consuming and cannot meet real-time monitoring needs.

[0004] Insufficient detection accuracy: Some online detection devices have low detection sensitivity to trace decomposition products, making it difficult to accurately identify early fault characteristic gases, resulting in delayed fault diagnosis.

[0005] Single function: Existing equipment can often only detect a single or a few decomposition products, and cannot comprehensively analyze the composition of the mixed gas, making it difficult to establish a complete fault diagnosis model.

[0006] Weak anti-interference ability: In the complex electromagnetic environment of power equipment, the detection device is easily interfered with, resulting in large fluctuations in detection data and poor stability.

[0007] In summary, there is an urgent need to develop a detection device and method that can quickly and accurately detect the components of the decomposition products of SF6 mixed insulating gas and adapt to the complex environment of power equipment on-site. Summary of the Invention

[0008] The present invention aims to solve the technical problems of low detection efficiency, insufficient detection accuracy, single function and weak anti-interference ability in the existing SF6 mixed insulating gas decomposition product component detection device, and provides a detection system for the decomposition product components of sulfur hexafluoride mixed insulating gas.

[0009] The detection system for the decomposition product components of the sulfur hexafluoride mixed insulating gas of the present invention comprises a sampling unit, a pre-processing unit, a detection unit and a data processing and control unit;

[0010] The sampling unit includes a gas sampling pump, a filtering device and a helium cylinder; the outlet of the gas sampling pump and the outlet of the helium cylinder are both connected to the inlet of the filtering device, and a solenoid valve is provided at the outlet of the helium cylinder;

[0011] The pretreatment unit includes a gas heating module, a condensation separation tank and a flow control module; the outlet of the filter device of the sampling unit is connected to the inlet of the gas heating module, the outlet of the gas heating module is connected to the inlet of the condensation separation tank, and the flow control module is provided at the outlet of the condensation separation tank;

[0012] The detection unit includes an infrared spectrum detection module, an electrochemical detection module and a mass spectrometry detection module, and the inlets of the three modules are connected to the outlet of the flow control module;

[0013] The data processing and control unit is based on a high-performance microprocessor and is further provided with a data acquisition module, an algorithm processing module, a communication module, a control module and a storage module; the signal output ends of the infrared spectrum detection module, the electrochemical detection module and the mass spectrometry detection module are all connected to the signal input end of the data acquisition module; the signal output end of the control unit is respectively connected to the signal input ends of the gas sampling pump, the solenoid valve, the gas heating module and the flow control module;

[0014] The data acquisition module acquires the signal data of each detection module in real time; the algorithm processing module processes and analyzes the data collected by the data acquisition module by establishing mathematical models and machine learning algorithms, and calculates the type and content of each decomposition product; the communication module supports 4G / 5G or Ethernet communication methods, uploads the detection results to the power equipment monitoring center in real time, and can receive remote control instructions to adjust equipment parameters through the control module.

[0015] The housing of the detection system for the decomposition product components of the sulfur hexafluoride mixed insulating gas is made of metal shielding material, has good electromagnetic shielding performance and waterproof and dustproof functions, and is adaptable to the complex environment of power equipment sites.

[0016] The functions of some modules in the present invention are as follows:

[0017] The filter device is composed of multiple layers of microporous filter elements, which can effectively remove solid particles and moisture in the gas to ensure the purity of the gas entering the detection unit;

[0018] The gas heating module preheats the sampled gas through an electric heating wire to prevent condensation of some decomposition products due to low gas temperature, which may affect the test results.

[0019] The flow control module uses a mass flow controller to accurately adjust the gas flow entering the subsequent detection unit to ensure a stable detection process;

[0020] Function of the condensation separation tank: After the sample gas is heated by the heating module, it can prevent the condensation of water vapor that has not been completely absorbed by the filter device. After entering the condensation separation tank, the water vapor in the gas is condensed into liquid water by cooling and discharged from the system, preventing moisture from entering the detection module and avoiding interference with detection accuracy (for example, water vapor may absorb infrared light of a specific wavelength or affect the electrode reaction of the electrochemical sensor);

[0021] Infrared spectroscopy detection module: Utilizing the characteristic absorption of infrared light by different gas molecules, this module detects decomposition products such as CF4 and SO2F2. Equipped with a highly sensitive infrared detector and a miniature Fourier transform spectrometer, this module enables wide-band spectral acquisition and rapid analysis.

[0022] Electrochemical Detection Module: Detects electrochemically active gases such as SO2 and H2S through a specific electrochemical sensor. The sensor uses a three-electrode structure, offering fast response and high detection accuracy.

[0023] Mass spectrometry detection module: A micro time-of-flight mass spectrometer is used to perform full component analysis on complex gas mixtures, capable of detecting low-concentration trace decomposition products. Equipped with a vacuum system and ion source, the mass spectrometer performs qualitative and quantitative analysis of gas components through ionization, acceleration, and time-of-flight measurement.

[0024] The method for using the detection system for the decomposition product components of the sulfur hexafluoride mixed insulating gas of the present invention is as follows:

[0025] 1. Device installation and parameter setting: Select a suitable location near the gas chamber of the power equipment to install this system. Connect the gas sampling pump to the equipment gas chamber through the sampling pipeline, ensuring that the connection is leak-proof. Turn on the power, check the operating status of each component of the device, and complete the initialization of the device. Set the operating parameters such as detection frequency, gas heating temperature, and flow control parameters through the operation interface or remote control software. Set the warning threshold for each decomposition product according to the equipment type and operating environment. Open the solenoid valve to introduce helium into the system and exhaust the air in the system to further improve the analysis accuracy and stability.

[0026] 2. Gas sampling: The gas sampling pump is started through the control module, and the SF6 mixed insulating gas is extracted from the gas chamber of the power equipment through the sampling pipeline. After the impurities are removed by the filtering device, it is sent to the pre-treatment unit;

[0027] 3. Gas Pretreatment: After the gas enters the pretreatment unit, the gas temperature is first raised to the set value (50°C) by the gas heating module to prevent condensation of decomposition products. The flow control module then adjusts the gas flow to the stable value (500mL / min) required by the detection unit.

[0028] 4. Component detection: The pre-treated gas enters the three detection modules in the detection unit in sequence:

[0029] Infrared spectrum detection module: scans the gas with infrared spectrum, obtains spectral absorption data, and determines the type and concentration of gases such as CF4 and SO2F2 by comparing with the standard spectrum library;

[0030] Electrochemical detection module: Gas reacts electrochemically with the electrochemical sensor to generate an electrical signal proportional to the gas concentration. After signal amplification and processing, the concentration value of gases such as SO2 and H2S is obtained;

[0031] Mass spectrometry detection module: The gas is ionized into ions in the ion source. After acceleration, the ions enter the time-of-flight mass spectrometer. Based on the relationship between the ion flight time and the mass-to-charge ratio, the full component information of the gas is analyzed and low-concentration trace decomposition products are detected;

[0032] 5. Data Processing and Analysis: The data processing and control unit collects the output data from each detection module, integrates and corrects the data using built-in algorithms, and combines historical data with equipment operating parameters to determine the insulation status of the power equipment. If the decomposition product content exceeds the preset threshold, a fault warning message is generated. Based on the warning, operation and maintenance personnel conduct further inspection and maintenance of the power equipment.

[0033] 6. Result output and transmission: The test results and fault warning information are uploaded to the power equipment monitoring center through the communication module, and displayed on the local display screen of the device at the same time, which is convenient for on-site staff to view.

[0034] 7. Equipment maintenance: Regularly perform maintenance on the system, including replacing the filter element of the filter device, calibrating the detection module, checking the power supply system, etc., to ensure long-term and stable operation of the device.

[0035] Through the above embodiments, the detection device and method of the present invention can efficiently and reliably detect and analyze the components of the decomposition products of the sulfur hexafluoride mixed insulating gas.

[0036] Through modular design, multi-sensor fusion, and intelligent algorithms, the system achieves high-precision and rapid detection of SF6 mixed gas decomposition products, meeting the stringent requirements of the power industry for equipment insulation condition monitoring. Its design complies with standards such as DL / T 1432-2015, "Technical Requirements for Instruments for Detecting Sulfur Hexafluoride Gas Decomposition Products," and GB / T 28185-2011, "Guidelines for the Management and Detection of Sulfur Hexafluoride Gases in Electrical Equipment."

[0037] Beneficial effects of the present invention:

[0038] 1. Rapid and accurate detection: The system of the present invention integrates multiple detection technologies and can quickly analyze multiple decomposition products simultaneously. It has high detection sensitivity and can detect early equipment failures in a timely manner.

[0039] 2. Online real-time monitoring: The system of the present invention can realize online continuous detection of SF6 mixed insulating gas without offline sampling, greatly shortening the detection cycle and improving equipment operation and maintenance efficiency;

[0040] 3. Comprehensive functions: The system of the present invention can detect various types of decomposition products, comprehensively analyze gas composition, and provide rich data support for fault diagnosis;

[0041] 4. Strong anti-interference ability: The system of the present invention adopts electromagnetic shielding design and high-performance data processing algorithm to effectively reduce the impact of electromagnetic interference from power equipment on the test results, ensuring data stability and reliability;

[0042] 5. Convenient operation: The system of the present invention supports remote control and automatic calibration functions, reducing the workload of operation and maintenance personnel. DETAILED DESCRIPTION

[0043] Specific embodiment 1: This embodiment is a detection system for the components of decomposition products of sulfur hexafluoride mixed insulating gas, including a sampling unit, a pre-processing unit, a detection unit and a data processing and control unit;

[0044] The sampling unit includes a gas sampling pump, a filtering device and a helium cylinder; the outlet of the gas sampling pump and the outlet of the helium cylinder are both connected to the inlet of the filtering device, and a solenoid valve is provided at the outlet of the helium cylinder;

[0045] The pretreatment unit includes a gas heating module, a condensation separation tank and a flow control module; the outlet of the filter device of the sampling unit is connected to the inlet of the gas heating module, the outlet of the gas heating module is connected to the inlet of the condensation separation tank, and the flow control module is provided at the outlet of the condensation separation tank;

[0046] The detection unit includes an infrared spectrum detection module, an electrochemical detection module and a mass spectrometry detection module, and the inlets of the three modules are connected to the outlet of the flow control module;

[0047] The data processing and control unit is based on a high-performance microprocessor and is further provided with a data acquisition module, an algorithm processing module, a communication module, a control module and a storage module; the signal output ends of the infrared spectrum detection module, the electrochemical detection module and the mass spectrometry detection module are all connected to the signal input end of the data acquisition module; the signal output end of the control unit is respectively connected to the signal input ends of the gas sampling pump, the solenoid valve, the gas heating module and the flow control module;

[0048] The data acquisition module acquires the signal data of each detection module in real time; the algorithm processing module processes and analyzes the data collected by the data acquisition module by establishing mathematical models and machine learning algorithms, and calculates the type and content of each decomposition product; the communication module supports 4G / 5G or Ethernet communication methods, uploads the detection results to the power equipment monitoring center in real time, and can receive remote control instructions to adjust equipment parameters through the control module.

[0049] The shell of the detection system for the decomposition product components of the sulfur hexafluoride mixed insulating gas is made of metal shielding material.

[0050] Specific embodiment 2: This embodiment differs from specific embodiment 1 in that the filtration device is a three-stage filtration device, which comprises a 3μm sintered stainless steel filter element, a 0.22μm polyethersulfone membrane, and an activated carbon adsorption column. Other aspects are the same as specific embodiment 1.

[0051] Specific embodiment 3: This embodiment differs from specific embodiment 1 or 2 in that the gas sampling pump is a micro diaphragm pump. Other aspects are the same as specific embodiment 1 or 2.

[0052] Specific embodiment 4: This embodiment differs from specific embodiments 1 to 3 in that the gas heating module is an electric heating wire. Other aspects are the same as specific embodiments 1 to 3.

[0053] Specific embodiment five: This embodiment differs from specific embodiment four in that the condensation separation tank is equipped with a spiral guide plate, which can accelerate gas-liquid separation through centrifugal force, causing condensed water to adhere to the tank wall, while pure gas continues to flow to the subsequent flow control module. If the gas contains tiny droplets or aerosols, they can also be initially removed through this structure to protect the detection module from liquid damage; the bottom of the condensation separation tank is connected to a peristaltic pump through a pipe, and the peristaltic pump periodically squeezes the pipe to discharge the accumulated condensed water out of the system in a timely or continuous manner, avoiding liquid accumulation in the tank and affecting separation efficiency. Other aspects are the same as specific embodiment four.

[0054] Specific embodiment 6: This embodiment differs from specific embodiment 5 in that the flow control module is a mass flow controller. Other aspects are the same as specific embodiment 5.

[0055] Specific embodiment 7: This embodiment differs from specific embodiment 6 in that the mass spectrometry detection module is a micro time-of-flight mass spectrometer. Other aspects are the same as specific embodiment 6.

[0056] Specific embodiment eight: This embodiment differs from specific embodiment seven in that the microprocessor is an industrial-grade ARM Cortex-A9 with a main frequency of 1 GHz, an integrated 12-bit ADC, and a sampling rate of 1 MS / s. Other aspects are the same as specific embodiment seven.

[0057] Specific embodiment 9: This embodiment differs from specific embodiment 8 in that the algorithm processing module is a multi-sensor fusion algorithm based on LSTM neural network, and the training sample size is greater than 100,000 groups. Other aspects are the same as specific embodiment 8.

[0058] Specific embodiment 10: This embodiment differs from specific embodiment 9 in that the communication module has a dual-port design (RJ45), supports Modbus TCP / IP, and has a built-in 4G module (Cat. 4); the storage module is a 128GB industrial-grade SSD, supporting 10 years of data storage. Other aspects are the same as specific embodiment 9.

Claims

1. A detection system for the components of decomposition products of sulfur hexafluoride mixed insulating gas, characterized in that The system includes a sampling unit, a pre-processing unit, a detection unit and a data processing and control unit; The sampling unit includes a gas sampling pump, a filtering device and a helium cylinder; the outlet of the gas sampling pump and the outlet of the helium cylinder are both connected to the inlet of the filtering device, and a solenoid valve is provided at the outlet of the helium cylinder; The pretreatment unit includes a gas heating module, a condensation separation tank and a flow control module; the outlet of the filter device of the sampling unit is connected to the inlet of the gas heating module, the outlet of the gas heating module is connected to the inlet of the condensation separation tank, and the flow control module is provided at the outlet of the condensation separation tank; The detection unit includes an infrared spectrum detection module, an electrochemical detection module and a mass spectrometry detection module, and the inlets of the three modules are connected to the outlet of the flow control module; The data processing and control unit is based on a high-performance microprocessor and is further provided with a data acquisition module, an algorithm processing module, a communication module, a control module and a storage module; the signal output ends of the infrared spectrum detection module, the electrochemical detection module and the mass spectrometry detection module are all connected to the signal input end of the data acquisition module; the signal output end of the control unit is respectively connected to the signal input ends of the gas sampling pump, the solenoid valve, the gas heating module and the flow control module; The data acquisition module acquires the signal data of each detection module in real time; the algorithm processing module processes and analyzes the data collected by the data acquisition module by establishing a mathematical model and machine learning algorithm, and calculates the type and content of each decomposition product; The communication module supports 4G / 5G or Ethernet communication, uploading the test results to the power equipment monitoring center in real time, and can receive remote control instructions to adjust equipment parameters through the control module. The shell of the detection system for the decomposition product components of the sulfur hexafluoride mixed insulating gas is made of metal shielding material.

2. The detection system for decomposition product components of sulfur hexafluoride mixed insulating gas according to claim 1, characterized in that The filtering device is a three-stage filtering device, which comprises a 3 μm sintered stainless steel filter element, a 0.22 μm polyethersulfone membrane and an activated carbon adsorption column.

3. The detection system for decomposition product components of sulfur hexafluoride mixed insulating gas according to claim 1, characterized in that The gas sampling pump is a micro diaphragm pump.

4. The detection system for decomposition product components of sulfur hexafluoride mixed insulating gas according to claim 1, characterized in that The gas heating module is an electric heating wire.

5. The detection system for decomposition product components of sulfur hexafluoride mixed insulating gas according to claim 1, characterized in that The condensation separation tank is equipped with a spiral guide plate; the bottom of the condensation separation tank is connected to a peristaltic pump via a pipeline.

6. The system for detecting decomposition product components of sulfur hexafluoride mixed insulating gas according to claim 1, characterized in that The flow control module is a mass flow controller.

7. The system for detecting decomposition product components of sulfur hexafluoride mixed insulating gas according to claim 1, characterized in that The mass spectrometry detection module is a micro time-of-flight mass spectrometer.

8. The system for detecting decomposition product components of sulfur hexafluoride mixed insulating gas according to claim 1, characterized in that The microprocessor is an industrial-grade ARM Cortex-A9 with a main frequency of 1 GHz, an integrated 12-bit ADC, and a sampling rate of 1 MS / s.

9. The system for detecting decomposition product components of sulfur hexafluoride mixed insulating gas according to claim 1, characterized in that The algorithm processing module is a multi-sensor fusion algorithm based on LSTM neural network, and the training sample size is >100,000 groups.

10. The system for detecting decomposition product components of sulfur hexafluoride mixed insulating gas according to claim 1, characterized in that The communication module is designed with dual network ports, RJ45, supports Modbus TCP / IP, and has a built-in 4G module Cat.4; the storage module is a 128GB industrial-grade SSD.