High-precision handheld SF6 gas density detection device and detection method

Abstract

The invention discloses a high-precision handheld SF6 gas density detection device which comprises a gas path interface, a detection mechanism and a handheld mechanism, the gas circuit interface is used for accessing an SF6 gas chamber of to-be-tested electrical equipment, and one end of the gas circuit interface is provided with a plurality of adapters of different types; the detection mechanism is used for collecting temperature information and pressure information of the SF6 gas chamber, and the detection mechanism is electrically connected with the handheld mechanism so as to transmit the temperature information and the pressure information of the SF6 gas chamber to the handheld mechanism; the detection mechanism comprises a first temperature sensor and a pressure sensor, and the first temperature sensor and the pressure sensor are electrically connected with the handheld mechanism; the handheld mechanism is used for storing the temperature information and the pressure information collected by the detection mechanism, calculating the corresponding density according to the temperature information and the pressure information, and judging whether the SF6 gas chamber has leakage abnormity or not; and the handheld mechanism comprises a reinforcing shell, a controller, a memory, a timer and a power supply. The invention also provides an SF6 gas density detection method.

Description

Technical Field

[0001] The present invention relates to the technical field of gas density detection, and in particular to a high-precision handheld SF6 gas density detection device and a detection method. Background Art

[0002] In the electric power industry, SF6 gas has become an indispensable key insulating gas in high-voltage electrical equipment due to its excellent insulation performance and arc extinguishing ability. It is widely used in core electrical equipment such as circuit breakers, transformers and gas insulated switches. The density state of SF6 gas is closely related to its electrical performance and the operating safety of the equipment. Traditionally, the monitoring of SF6 gas density mainly relies on density relays or transmitters installed on electrical equipment. These instruments can track the density changes of SF6 gas in real time, providing a strong guarantee for the stable operation of the power system. However, instruments in long-term operation are susceptible to various factors such as aging, environmental pollution or calibration deviation, resulting in a gradual decrease in measurement accuracy, which in turn affects the safety and reliability of the equipment.

[0003] In order to detect the accuracy of key data of field instruments, the traditional detection methods are as follows: 1. Remove the instrument from the running equipment and send it to a professional laboratory for inspection and testing. This process is not only time-consuming and inefficient, seriously affecting the continuous operation of the equipment, but also increases the complexity of operation and maintenance costs.

[0004] 2. Use professional detectors for on-site testing. Such detectors are generally expensive, bulky, complicated to operate, have limited use conditions, and have certain requirements for users. They are greatly affected by environmental factors and it is difficult to ensure the accuracy and efficiency of the test.

[0005] In actual field applications, when the gas density relay alarms or displays a low value, people usually add gas directly to the electrical equipment. However, it is often the density relay itself that has a problem, rather than the electrical equipment leaking gas, which causes the density to be filled more and more, which in turn causes the safety valve to release, resulting in serious quality accidents. Summary of the invention

[0006] In view of this, it is necessary to provide a high-precision handheld SF6 gas density detection device that is efficient, accurate, portable and easy to operate.

[0007] It is also necessary to provide a method for detecting the density of SF6 gas.

[0008] A high-precision handheld SF6 gas density detection device comprises a gas path interface, a detection mechanism, and a handheld mechanism; The gas circuit interface is used to access the SF6 gas chamber of the electrical equipment to be tested, and one end of the gas circuit interface is provided with a plurality of adapters of different types to adapt to the SF6 gas chambers of different electrical equipment to be tested; when working, one end of the gas circuit interface is connected to the SF6 gas chamber of the electrical equipment to be tested, and the other end of the gas circuit interface is connected to the detection mechanism; The detection mechanism is used to collect the temperature information and pressure information of the SF6 gas chamber, and the detection mechanism is electrically connected to the handheld mechanism to transmit the temperature information and pressure information of the SF6 gas chamber to the handheld mechanism; the detection mechanism includes a first temperature sensor and a pressure sensor, and the first temperature sensor and the pressure sensor are electrically connected to the handheld mechanism; The handheld mechanism is used to store the temperature information and pressure information collected by the detection mechanism, and calculate the corresponding density based on the temperature information and pressure information to determine whether there is a leakage abnormality in the SF6 gas chamber; the handheld mechanism includes a reinforced shell, a controller, a memory, a timer, and a power supply. The controller, the memory, the timer, and the power supply are arranged in the reinforced shell. The controller is electrically connected to the pressure sensor and the first temperature sensor to convert the temperature information and pressure information collected by the pressure sensor and the first temperature sensor into temperature detection values ​​and pressure detection values. The controller is also electrically connected to the memory to store the temperature detection value and the pressure detection value in the memory. The memory also stores pressure thresholds corresponding to different temperatures. The controller retrieves the corresponding pressure threshold at the same temperature in the memory according to the temperature detection value to determine whether there is an abnormality in the pressure detection value; if the pressure detection value is less than or equal to the pressure threshold, then the pressure detection value is abnormal; the controller is also electrically connected to the timer to count the detection temperature duration and the detection pressure duration; the controller also stores the location information, ID information, and time information of the measuring point in the memory to facilitate personnel to analyze data; the power supply is used to power the handheld mechanism.

[0009] A method for detecting SF6 gas density comprises the following steps: Step S1: Use a handheld high-precision SF6 gas density detection device to detect the temperature and pressure of the SF6 gas chamber of the electrical equipment to be tested; Step S2: searching for the corresponding pressure threshold according to the detected temperature. If the detected pressure is less than or equal to the pressure threshold, then an abnormal SF6 gas leakage occurs at the detection point; if the detected pressure is greater than the pressure threshold, there is no SF6 gas leakage; Step S3: When the SF6 gas leakage is abnormal, the gas path information analysis module issues a warning voice and displays the current temperature value, pressure value and gas density value.

[0010] Beneficial effects: The high-precision handheld SF6 gas density detection device of the present invention adopts a split design. The detection mechanism is directly connected to the gas supply port of the electrical equipment to be tested through a conversion joint, and the data is transmitted to the handheld mechanism through the gas path interface, which avoids the external gas path being too long and reduces the possibility of gas leakage. The rich conversion joints can better adapt to electrical equipment of different manufacturers or models. The split design is easy to disassemble and can be loaded into a customized toolbox, which is more convenient for operation and maintenance personnel to travel long distances and carry. The split design can flexibly replace the faulty mechanism in the event of a failure of the detection mechanism or the handheld mechanism, providing a redundant option. For batch measurement, the detector can store data. The data items of a single measurement data include the location information, ID information, temperature, pressure, density and measurement time of the measurement point for the user to input, which is convenient for the user to analyze the data. The overall assembly of the detector is convenient to carry, and the operation is simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a module schematic diagram of the high-precision handheld SF6 gas density detection device of the present invention.

[0012] Figure 2 It is a structural schematic diagram of the hand-held mechanism of the present invention.

[0013] Figure 3 It is the interactive principle diagram of the present invention.

[0014] In the figure: a high-precision handheld SF6 gas density detection device 10, a gas path interface 20, a detection mechanism 30, a first temperature sensor 301, a pressure sensor 302, a handheld mechanism 40, a reinforced shell 401, a controller 402, a memory 403, a timer 404, and a display 405. DETAILED DESCRIPTION

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Please see Figure 1 and Figure 2 , a high-precision handheld SF6 gas density detection device 10 includes a gas path interface 20, a detection mechanism 30, and a handheld mechanism 40; The gas circuit interface 20 is used to access the SF6 gas chamber of the electrical equipment to be tested. One end of the gas circuit interface 20 is provided with a plurality of different types of adapters to adapt to different SF6 gas chambers of the electrical equipment to be tested. When working, one end of the gas circuit interface 20 is connected to the SF6 gas chamber of the electrical equipment to be tested, and the other end of the gas circuit interface 20 is connected to the detection mechanism 30. The detection mechanism 30 is used to collect the temperature information and pressure information of the SF6 gas chamber. The detection mechanism 30 is electrically connected to the handheld mechanism 40 to transmit the temperature information and pressure information of the SF6 gas chamber to the handheld mechanism 40; the detection mechanism 30 includes a first temperature sensor 301 and a pressure sensor 302, and the first temperature sensor 301 and the pressure sensor 302 are electrically connected to the handheld mechanism 40; The handheld mechanism 40 is used to store the temperature information and pressure information collected by the detection mechanism 30, and calculate the corresponding density based on the temperature information and pressure information to determine whether there is a leakage abnormality in the SF6 gas chamber; the handheld mechanism 40 includes a reinforced shell 401, a controller 402, a memory 403, a timer 404, and a power supply. The controller 402, the memory 403, the timer 404, and the power supply are arranged in the reinforced shell 401. The controller 402 is electrically connected to the pressure sensor 302 and the first temperature sensor 301 to convert the temperature information and pressure information collected by the pressure sensor 302 and the first temperature sensor 301 into a temperature detection value and a pressure detection value. The controller 402 is also connected to the The memory 403 is electrically connected to store the temperature detection value and the pressure detection value in the memory 403. The memory 403 also stores the pressure thresholds corresponding to different temperatures. The controller 402 retrieves the corresponding pressure threshold at the same temperature in the memory 403 according to the temperature detection value to determine whether there is an abnormality in the pressure detection value; if the pressure detection value is less than or equal to the pressure threshold, then there is an abnormality in the pressure detection value; the controller 402 is also electrically connected to the timer 404 to count the duration of the temperature detection and the duration of the pressure detection; the controller 402 also stores the location information, ID information, and time information of the measuring point in the memory 403 to facilitate personnel to analyze data; the power supply is used to power the handheld mechanism 40.

[0017] Furthermore, the handheld mechanism 40 also includes a display 405. In a preferred embodiment, the display 405 is an integrated resistive touch screen, which not only has a strong anti-electromagnetic interference capability, but also provides users with a quick and simple interaction path and rich interaction functions.

[0018] In a preferred embodiment, if the display 405 is not touched within 60 seconds, the system enters a low power consumption mode and wakes up when it is touched again.

[0019] Specifically, the “pressure threshold corresponding to the same temperature in the memory 403” is obtained by performing temperature and pressure tests on SF6 to obtain the SF6 liquefaction temperature at different pressures and the liquefaction sudden change pressure value at different temperatures, and the sudden change pressure value is the pressure threshold. According to the detected temperature, the sudden change pressure value at the temperature is retrieved, that is, the pressure threshold. If the pressure detection value is less than or equal to the pressure threshold, the controller 402 sends a liquefaction notice signal and / or information and displays it on the display 405.

[0020] Furthermore, the detection mechanism 30 also includes a second temperature sensor to diagnose the performance of the gas density relay on the electrical equipment; the second temperature sensor is arranged on the outside of the detection mechanism 30, and the second temperature sensor can be extended into the shell of the gas density relay. The second temperature sensor is electrically connected to the controller 402. The controller 402 receives the detection pressure and detection temperature of the pressure sensor 302 and the second temperature sensor to obtain the detection density value, and then compares the detection density value with the density value on the gas density relay to determine whether the gas density relay is working normally.

[0021] In a preferred embodiment, the high-precision handheld SF6 gas density detection device further includes a power diagnosis module, which is electrically connected to the handheld mechanism 40 and displays the power supply power of the handheld mechanism 40; The power diagnosis module includes: 24-bit high-speed analog digital signal acquisition device (ADC) U2, to collect the voltage signal of the high-precision sampling resistor (R2); High-precision voltage reference chip (U1) to provide reference voltage; High precision and low temperature drift coefficient sampling resistor (0.01%, 25ppm / degree) is used to generate sampling voltage.

[0022] The voltage across the acquisition resistor (R2) in series with the battery is collected through an analog-to-digital signal converter (U2), and the voltage across the resistor (V) and the working current i are calculated; the real-time battery power is calculated by calculating Q1=i (real-time battery current)*t (time); through the real-time power Q1 and the current discharge curve M in the battery specification, there is a certain mapping relationship between the real-time power and the battery discharge curve, and the battery remaining power formula Q=f(Q1, M) is obtained.

[0023] In a preferred embodiment, the gas circuit interface 20 and the detection mechanism 30 are detachably connected.

[0024] When used on site, first use the gas circuit interface 20 to connect with the detection mechanism 30, keep the gas circuit interface 20 connected to the atmosphere, press the power switch, and after the system of the handheld mechanism 40 is initialized, select a suitable adapter to connect to the SF6 gas chamber to be tested, wait for the data to stabilize, and then read the data information on the display 405 of the handheld mechanism 40.

[0025] In a preferred embodiment, see Figure 3 The interaction process of the handheld mechanism 40 of the present invention is as follows: Press the power button to turn on the power, and the display 405 displays page 1: welcome page, and then jumps to page 2: temperature, pressure, SF6 density real-time display page, and this page provides the user with "menu" and "save" function buttons.

[0026] Click the "Save" function button, and the temperature, pressure, and SF6 density of page 2 are saved to the memory 403. Jump to page 3: location information, ID number entry page, which provides the user with two clickable and input text boxes, namely location information and ID information. The temperature, pressure, and SF6 density data to be saved and the time record of the saving operation are displayed below the text boxes for the user to view, and the user is provided with "Return to previous level" and "Save" function buttons; when the "Return to previous level" button is pressed, jump to page 2; when the "Save" button is pressed, the data is saved.

[0027] Click the location information text box, and a keyboard will pop up. Enter the location information consisting of English characters and numbers. In addition to the English character and number buttons, the keyboard has "←" for backspace, "Esc" for closing the keyboard, and "Enter" for confirmation. The same is true for ID information input. After entering the location information and ID information, click Save to jump to page four: pop-up page. The pop-up page has two function buttons, "Confirm" and "Cancel". Press the "Confirm" button, and the system will store the input location information, ID information, temperature, pressure, SF6 density data, and the time record of the save operation as a record in the memory 403, and jump to page two. The user presses the "Cancel" button to jump directly to page two.

[0028] Press the "Menu" button on page 2 to jump to page 5, which provides users with "Time Setting", "Brightness Configuration", "Absolute Table Switch", and "Return to Previous Level" function buttons. Press "Return to Previous Level" to jump to page 2; Press the "Time Configuration" function button to jump to page seven. This page provides five clickable and inputtable text boxes, corresponding to year, month, day, hour, minute, and second respectively. When the user clicks a text box, a keyboard pops up to input the year information composed of numbers. Except for the number button, backspace button, and enter button, the rest of the keyboard is considered invalid. The same applies to day, hour, minute, and second. There is also a "Return to Previous Level" function button. Press the "Return to Previous Level" function button to jump to page five. Press the "Brightness Configuration" function button to jump to page six, which provides a graphical slider. Drag the slider to adjust the screen brightness. It also provides a "Return to Previous Level" function button. Press the "Return to Previous Level" function button to jump to page five. Press the "Absolute Pressure Switch" function button to jump to page eight, which provides the "Gauge Pressure" and "Absolute Pressure" function buttons. This page provides the "Gauge Pressure" and "Absolute Pressure" function buttons. Press the "Gauge Pressure" function button to display the relative pressure value in real time and automatically jump to page five. Press the "Absolute Pressure" function button to display the absolute pressure value in real time and automatically jump to page five.

[0029] The method for detecting the SF6 gas density of the present invention comprises the following steps: Step S1: Use a handheld high-precision SF6 gas density detection device to detect the temperature and pressure of the SF6 gas chamber of the electrical equipment to be tested; Step S2: searching for the corresponding pressure threshold according to the detected temperature. If the detected pressure is less than or equal to the pressure threshold, then an abnormal SF6 gas leakage occurs at the detection point; if the detected pressure is greater than the pressure threshold, there is no SF6 gas leakage; Step S3: When the SF6 gas leakage is abnormal, the gas path information analysis module issues a warning voice and displays the current temperature value, pressure value and gas density value.

[0030] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A high-precision handheld SF6 gas density detection device, characterized in that: Including gas path interface, detection mechanism, and hand-held mechanism; The gas circuit interface is used to access the SF6 gas chamber of the electrical equipment to be tested, and one end of the gas circuit interface is provided with a plurality of adapters of different types to adapt to the SF6 gas chambers of different electrical equipment to be tested; when working, one end of the gas circuit interface is connected to the SF6 gas chamber of the electrical equipment to be tested, and the other end of the gas circuit interface is connected to the detection mechanism; The detection mechanism is used to collect the temperature information and pressure information of the SF6 gas chamber, and the detection mechanism is electrically connected to the handheld mechanism to transmit the temperature information and pressure information of the SF6 gas chamber to the handheld mechanism; the detection mechanism includes a first temperature sensor and a pressure sensor, and the first temperature sensor and the pressure sensor are electrically connected to the handheld mechanism; The handheld mechanism is used to store the temperature information and pressure information collected by the detection mechanism, and calculate the corresponding density based on the temperature information and pressure information to determine whether there is a leakage abnormality in the SF6 gas chamber; the handheld mechanism includes a reinforcement shell, a controller, a memory, a timer, and a power supply. The controller, the memory, the timer, and the power supply are arranged in the reinforcement shell. The controller is electrically connected to the pressure sensor and the first temperature sensor to convert the temperature information and pressure information collected by the pressure sensor and the first temperature sensor into temperature detection values ​​and pressure detection values. The controller is also electrically connected to the memory to store the temperature detection value and the pressure detection value in the memory. The memory also stores pressure thresholds corresponding to different temperatures. The controller retrieves the corresponding pressure threshold at the same temperature in the memory according to the temperature detection value to determine whether there is an abnormality in the pressure detection value; If the pressure detection value is less than or equal to the pressure threshold, then the pressure detection value is abnormal; The controller is also electrically connected to the timer to count the duration of the detected temperature and the duration of the detected pressure; The controller also stores the location information, ID information, and time information of the measurement point in the memory to facilitate personnel to analyze the data; The power supply is used to power the handheld mechanism.

2. The high-precision handheld SF6 gas density detection device according to claim 1, characterized in that: The handheld mechanism also includes a display that is an integrated resistive touch screen.

3. The high-precision handheld SF6 gas density detection device according to claim 2, characterized in that: If the display is not touched within 60 seconds, the system enters low power mode and wakes up when it is touched again.

4. The high-precision handheld SF6 gas density detection device according to claim 1, characterized in that: The detection mechanism also includes a second temperature sensor to diagnose the performance of the gas density relay on the electrical equipment; the second temperature sensor is arranged outside the detection mechanism, the second temperature sensor can extend into the shell of the gas density relay, and the second temperature sensor is electrically connected to the controller.

5. The high-precision handheld SF6 gas density detection device according to claim 1, characterized in that: The high-precision handheld SF6 gas density detection device also includes an electric quantity diagnosis module, which is electrically connected to the handheld mechanism and displays the power quantity of the handheld mechanism; The power diagnosis module includes: 24-bit high-speed analog digital signal acquisition device (ADC) U2, to collect the voltage signal of the high-precision sampling resistor (R2); High-precision voltage reference chip (U1) to provide reference voltage; High-precision\low-temperature drift coefficient sampling resistor (0.01%, 25ppm / degree) to generate sampling voltage; The voltage across the acquisition resistor (R2) in series with the battery is collected through an analog-to-digital signal converter (U2), and the voltage across the resistor (V) and the working current i are calculated; the real-time battery power is calculated by calculating Q1=i (real-time battery current)*t (time); through the real-time power Q1 and the current discharge curve M in the battery specification, there is a certain mapping relationship between the real-time power and the battery discharge curve, and the battery remaining power formula Q=f(Q1, M) is obtained.

6. The high-precision handheld SF6 gas density detection device according to claim 1, characterized in that: The gas path interface and the detection mechanism are detachably connected.

7. A method for detecting SF6 gas density using the high-precision handheld SF6 gas density detection device according to claim 1 comprises the following steps: Step S1: Use a handheld high-precision SF6 gas density detection device to detect the temperature and pressure of the SF6 gas chamber of the electrical equipment to be tested; Step S2: searching for the corresponding pressure threshold according to the detected temperature. If the detected pressure is less than or equal to the pressure threshold, then an abnormal SF6 gas leakage occurs at the detection point; if the detected pressure is greater than the pressure threshold, there is no SF6 gas leakage; Step S3: When the SF6 gas leakage is abnormal, the gas path information analysis module issues a warning voice and displays the current temperature value, pressure value and gas density value.

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