Gas relay detection device

Abstract

The invention discloses a gas relay detection device, and the device comprises a gas collection module which is used for collecting combustible gas generated in a transformer, and guiding the gas into the detection device; the gas volume measurement module is used for measuring the volume change of the gas entering the detection device according to a volume test principle; the gas component analysis module is used for analyzing the components and the concentration of the collected gas by utilizing a gas component analysis technology so as to judge the type of the internal fault of the transformer; the data transmission module is used for transmitting the detected gas volume and component data to a central monitoring system for real-time analysis and alarm; and the auxiliary diagnosis module is used for performing auxiliary diagnosis on internal faults of the transformer by combining the data in the data transmission module with the oil level and the oil flow rate of the transformer. Volume and component changes of combustible gas in the transformer are monitored in real time, and accuracy and real-time performance of transformer fault detection are improved.

Description

Technical Field

[0001] The invention relates to the technical field of transformer safety monitoring in an electric power system, and in particular to a gas relay detection device. Background Art

[0002] Gas protection, as an indispensable main protection means for transformers, is known for its ability to quickly respond to internal faults. It can keenly capture a variety of faults such as short circuits between turns and layers of transformer windings, core faults, abnormalities inside bushings, and oil level drops, ensuring the safe operation of transformers. When a serious fault occurs inside an oil-immersed transformer, the arc will quickly decompose the insulating material, produce a large amount of gas, and then cause a violent surge of oil flow in the oil tank. Once the speed of this oil flow exceeds the design threshold of the gas relay baffle, the heavy gas relay will quickly act to cut off the circuit breaker, effectively curbing the further deterioration of the accident and providing a solid protection barrier for the transformer. However, in the long-term operation and maintenance of the transformer, the problem of malfunction of the heavy gas relay occurs from time to time, which undoubtedly poses a considerable challenge to the stable operation of the transformer. There are many reasons for malfunction. For example, non-fault disturbances in the oil flow inside the transformer may cause the lower float to connect the node, thereby triggering the action of the heavy gas relay; for example, unexpected surges in the oil flow inside the transformer may also cause the baffle to connect the node, which also causes malfunction of the heavy gas relay. These false operations not only cause unplanned shutdown of the transformer, but also increase the difficulty and time cost for on-site personnel to troubleshoot the cause of the fault. Summary of the invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a gas relay detection device, which improves the accuracy and real-time performance of transformer fault detection by real-time monitoring of the volume and composition changes of the combustible gas inside the transformer. At the same time, the device has a simple structure, is easy to install and maintain, and reduces the difficulty and cost of operation.

[0004] The present invention also provides a gas relay detection device as described above, comprising: Gas collection module: used to collect the combustible gas generated inside the transformer and guide the gas into the detection device; Gas volume measurement module: measures the volume change of the gas entering the detection device through the volume test principle; Gas composition analysis module: uses gas composition analysis technology to analyze the composition and concentration of the collected gas to determine the type of internal fault of the transformer; Data transmission module: transmits the detected gas volume and composition data to the central monitoring system for real-time analysis and alarm; Auxiliary diagnosis module: Combines the data in the data transmission module with parameters such as transformer oil level and oil flow rate to perform auxiliary diagnosis on internal faults of the transformer.

[0005] According to a gas relay detection device provided by the present invention, the gas collection module includes a gas collection pipe connected to the top of the transformer oil tank, the end of the gas collection pipe is fixedly connected to a gas filter, and a gas valve with adjustable flow is arranged inside the gas collection pipe.

[0006] According to a gas relay detection device provided by the present invention, the gas volume measurement module includes a container with adjustable volume, a pressure sensor and a temperature sensor are arranged inside the container, a gas inlet and a gas outlet are arranged on the container, the gas inlet is connected to the gas collection module, and the gas outlet is connected to the gas discharge device.

[0007] According to a gas relay detection device provided by the present invention, the gas composition analysis module includes a gas chromatograph, the gas chromatograph is electrically connected to a data processing unit, and the data processing unit is used to convert the analysis data into a standard format and transmit it to the data transmission module.

[0008] According to a gas relay detection device provided by the present invention, the data transmission module includes a wireless communication unit and a wired communication unit, the wireless communication unit adopts one of Wi-Fi, Bluetooth or Zigbee, and the wired communication unit realizes data transmission through one of RS-485, CAN bus or Ethernet.

[0009] A method for using a gas relay detection device comprises the following steps: S1. Initialization settings: Before installing the gas relay detection device, initialize the gas collection module, gas volume measurement module, gas composition analysis module and data transmission module; S2. Set parameters: 1) Gas collection module: Set the flow control parameters of the gas collection module to ensure that the gas can stably enter the detection device; 2) Gas volume measurement module: Set the measurement range and accuracy of the gas volume measurement module to ensure that the volume change of the gas can be accurately measured; 3) Gas composition analysis module: Set the analysis parameters of the gas composition analysis module to ensure that the key components in the gas can be accurately identified and measured; S3. Real-time monitoring and data acquisition: Start the gas relay detection device to start real-time monitoring of the combustible gas generated inside the transformer. The gas collection module introduces the collected gas into the gas volume measurement module and the gas composition analysis module. The gas volume measurement module measures the volume change of the gas in real time and sends the measurement data to the data processing unit. The gas composition analysis module analyzes the gas composition and sends the analysis data to the data processing unit. S4. Data processing and analysis: The data processing unit receives data from the gas volume measurement module and the gas composition analysis module, performs preprocessing and format conversion, and sends the processed data to the central monitoring system through the data transmission module. After receiving the data, the central monitoring system further analyzes and processes the data through the auxiliary diagnosis module to determine whether there is a fault inside the transformer; S5. Alarm and fault handling: When the central monitoring system detects abnormal gas volume or composition, it will immediately send out an alarm signal. The alarm signal uses one or more of sound alarm, light alarm, and SMS alarm to promptly notify relevant personnel for processing. Relevant personnel will troubleshoot and handle the transformer based on the alarm signal and the fault information provided by the central monitoring system.

[0010] Beneficial Effects The present invention improves the accuracy and real-time performance of transformer fault detection by real-time monitoring of the volume and composition changes of the combustible gas inside the transformer. At the same time, the device has a simple structure, is easy to install and maintain, and reduces the difficulty and cost of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention is further described below in conjunction with the accompanying drawings and embodiments; Figure 1 It is a schematic diagram of the process of the gas relay detection device of the present invention; Figure 2 Schematic diagram of the control method of the gas relay detection device in this embodiment.

[0012] Legend: 1. Sensor; 2. Connecting pipe; 3. Oil storage tank; 4. Float; 5. Magnetic switch; 6. Oil drain valve; 7. Vacuum pump; 8. Valve; 9. Polymer diaphragm. DETAILED DESCRIPTION

[0013] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0014] Reference Figure 1, an embodiment of the present invention provides a gas relay detection device, which includes: Gas collection module: used to collect the combustible gas generated inside the transformer and guide the gas into the detection device; the gas collection module includes a gas collection pipe connected to the top of the transformer oil tank, which is used to collect the combustible gas generated inside the transformer. A gas filter is connected to the end of the gas collection pipe to remove impurities and particulate matter in the gas to prevent interference with subsequent measurement modules. The gas collection pipe is also equipped with a gas valve with adjustable flow rate to control the flow of gas entering the detection device; Gas volume measurement module: Through the volume test principle, the volume change of the gas entering the detection device is measured. Gas volume measurement module: This module includes a container with adjustable volume. A pressure sensor and a temperature sensor are provided inside the container to monitor the gas pressure and temperature inside the container in real time. The container is also equipped with a gas inlet and a gas outlet. The gas inlet is connected to the gas collection module, and the gas outlet is connected to a gas discharge device. By measuring the changes in the gas pressure and temperature inside the container, combined with the volume change of the container, the volume of the gas entering the container can be calculated; Gas composition analysis module: uses gas composition analysis technology to analyze the composition and concentration of the collected gas to determine the type of internal fault of the transformer; Gas composition analysis module: This module uses gas analysis technology such as gas chromatograph or infrared spectrometer to analyze the composition of the collected gas. The gas analysis module can identify and measure the content of key components such as hydrogen, methane, ethane, ethylene, acetylene, etc. in the gas. The gas analysis module is also equipped with a data processing unit to convert the analysis data into a standard format and transmit it to the data transmission module.

[0015] Data transmission module: transmits the detected gas volume and composition data to the central monitoring system for real-time analysis and alarm. Data transmission module: This module includes a wireless communication unit and a wired communication unit, which are used to transmit the detected gas volume and composition data to the central monitoring system. The wireless communication unit uses wireless communication technologies such as Wi-Fi, Bluetooth or Zigbee to achieve remote communication with the central monitoring system. The wired communication unit uses wired communication technologies such as RS-485, CAN bus or Ethernet to transmit data with the central monitoring system; Auxiliary diagnosis module: Combines the data in the data transmission module with parameters such as transformer oil level and oil flow rate to perform auxiliary diagnosis on internal faults of the transformer.

[0016] A method for using a gas relay detection device comprises the following steps: S1. Initialization settings: Before installing the gas relay detection device, initialize the gas collection module, gas volume measurement module, gas composition analysis module and data transmission module; S2. Set parameters: 1) Gas collection module: Set the flow control parameters of the gas collection module to ensure that the gas can stably enter the detection device; 2) Gas volume measurement module: Set the measurement range and accuracy of the gas volume measurement module to ensure that the volume change of the gas can be accurately measured; 3) Gas composition analysis module: Set the analysis parameters of the gas composition analysis module to ensure that the key components in the gas can be accurately identified and measured; S3. Real-time monitoring and data acquisition: Start the gas relay detection device to start real-time monitoring of the combustible gas generated inside the transformer. The gas collection module introduces the collected gas into the gas volume measurement module and the gas composition analysis module. The gas volume measurement module measures the volume change of the gas in real time and sends the measurement data to the data processing unit. The gas composition analysis module analyzes the gas composition and sends the analysis data to the data processing unit. S4. Data processing and analysis: The data processing unit receives data from the gas volume measurement module and the gas composition analysis module, performs preprocessing and format conversion, and sends the processed data to the central monitoring system through the data transmission module. After receiving the data, the central monitoring system further analyzes and processes the data through the auxiliary diagnosis module to determine whether there is a fault inside the transformer; S5. Alarm and fault handling: When the central monitoring system detects abnormal gas volume or composition, it immediately sends out an alarm signal. The alarm signal uses one or more of the present embodiment's sound alarm, light alarm, and SMS alarm to promptly notify relevant personnel for processing. Relevant personnel conduct fault detection and processing on the transformer based on the alarm signal and the fault information provided by the central monitoring system.

[0017] refer to Figure 2 , a control method for a gas relay detection device, comprising the following steps: When the gas relay detects the formation of gas, which causes the liquid level to drop, this process is accurately captured by sensor 1. The sensor contains two insulated cylindrical plates - the inner electrode and the outer electrode, between which is filled an electrolyte with a dielectric constant of ε. Based on physical principles, the capacitance C formed between the two plates can be calculated by the following formula:

[0018] Where L represents the length of the overlapping part of the two cylinders, D is the diameter of the outer cylinder electrode, d is the diameter of the inner cylinder electrode, and ε is the dielectric constant of the medium. In practical applications, D, d, and ε are considered constant values. Therefore, the change in capacitance C can directly reflect L, that is, the height of the liquid level drop.

[0019] By measuring the real-time changes in capacitance C, the system can accurately calculate the specific height to which the liquid level drops. Combined with the cross-sectional area inside the shell, the volume of the internal gas can be further deduced. Once the gas volume reaches the preset relay alarm threshold, the alarm switch is immediately activated, and the oil drain valve 6 responds to discharge the transformer oil in the connecting pipe 2 and the oil storage tank 3. As the oil level drops, the float 4 in the oil storage tank 3 also drops accordingly. When the float 4 drops to one-third of the liquid level in the oil storage tank, the magnet below it triggers the magnetic switch 5, and then the oil drain valve 6 closes. At this time, the vacuum pump 7 starts automatically, draws out the air in the gas volume detection module, and automatically stops after completing the task, thereby triggering the valve 8 to open.

[0020] The gas then passes through valve 8 and enters the area of ​​polymer diaphragm 9. This special diaphragm can effectively isolate the oil and only allow gas to pass and enter, and then be discharged after detection.

[0021] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A gas relay detection device, characterized in that: include: Gas collection module: used to collect the combustible gas generated inside the transformer and guide the gas into the detection device; Gas volume measurement module: measures the volume change of the gas entering the detection device through the volume test principle; Gas composition analysis module: uses gas composition analysis technology to analyze the composition and concentration of the collected gas to determine the type of internal fault of the transformer; Data transmission module: transmits the detected gas volume and composition data to the central monitoring system for real-time analysis and alarm; Auxiliary diagnosis module: Combines the data in the data transmission module with parameters such as transformer oil level and oil flow rate to perform auxiliary diagnosis on internal faults of the transformer.

2. A gas relay detection device according to claim 1, characterized in that: The gas collection module comprises a gas collection pipe connected to the top of the transformer oil tank, a gas filter is fixedly connected to the end of the gas collection pipe, and a gas valve with adjustable flow is arranged inside the gas collection pipe.

3. A gas relay detection device according to claim 1, characterized in that: The gas volume measurement module includes a container with adjustable volume, a pressure sensor and a temperature sensor are arranged inside the container, a gas inlet and a gas outlet are arranged on the container, the gas inlet is connected to the gas collection module, and the gas outlet is connected to the gas exhaust device.

4. A gas relay detection device according to claim 1, characterized in that: The gas component analysis module includes a gas chromatograph, and the gas chromatograph is electrically connected to a data processing unit. The data processing unit is used to convert the analysis data into a standard format and transmit it to the data transmission module.

5. A gas relay detection device according to claim 1, characterized in that: The data transmission module includes a wireless communication unit and a wired communication unit. The wireless communication unit adopts one of Wi-Fi, Bluetooth or Zigbee, and the wired communication unit realizes data transmission through one of RS-485, CAN bus or Ethernet.

6. A gas relay detection device according to any one of claims 1 to 5, characterized in that: Also includes the following usage: S1. Initialization settings: Before installing the gas relay detection device, initialize the gas collection module, gas volume measurement module, gas composition analysis module and data transmission module; S2. Set parameters: 1) Gas collection module: Set the flow control parameters of the gas collection module to ensure that the gas can stably enter the detection device; 2) Gas volume measurement module: Set the measurement range and accuracy of the gas volume measurement module to ensure that the volume change of the gas can be accurately measured; 3) Gas composition analysis module: Set the analysis parameters of the gas composition analysis module to ensure that the key components in the gas can be accurately identified and measured; S3. Real-time monitoring and data acquisition: Start the gas relay detection device to start real-time monitoring of the combustible gas generated inside the transformer. The gas collection module introduces the collected gas into the gas volume measurement module and the gas composition analysis module. The gas volume measurement module measures the volume change of the gas in real time and sends the measurement data to the data processing unit. The gas composition analysis module analyzes the gas composition and sends the analysis data to the data processing unit. S4. Data processing and analysis: The data processing unit receives data from the gas volume measurement module and the gas composition analysis module, performs preprocessing and format conversion, and sends the processed data to the central monitoring system through the data transmission module. After receiving the data, the central monitoring system further analyzes and processes the data through the auxiliary diagnosis module to determine whether there is a fault inside the transformer; S5. Alarm and fault handling: When the central monitoring system detects abnormal gas volume or composition, it will immediately send out an alarm signal. The alarm signal uses one or more of sound alarm, light alarm, and SMS alarm to promptly notify relevant personnel for processing. Relevant personnel will troubleshoot and handle the transformer based on the alarm signal and the fault information provided by the central monitoring system.

Images