Insulating gas leakage detection equipment for arc extinguish chamber

Abstract

The invention discloses an arc extinguish chamber insulating gas leakage detection device. Comprising a shell internally provided with a cavity, a gas chamber arranged in the shell, a gas receiving port arranged on the shell and communicated with the gas chamber, an infrared light processing module and a pyroelectric infrared detector which are respectively arranged at two ends of the shell, and an information processing module connected with the pyroelectric infrared detector, the gas receiving port is used for absorbing insulating gas leaked from the arc extinguish chamber; infrared light emitted by the infrared light processing module passes through the gas chamber and then is received by the pyroelectric infrared detector; and the information processing module is used for calculating the concentration of the insulating gas according to the intensity change after the infrared light is emitted and received. According to the invention, the concentration of the insulating gas leaked from the arc extinguish chamber can be timely and accurately detected.

Description

Technical Field

[0001] The present application relates to the technical field of gas detection, and in particular to an arc extinguishing chamber insulating gas leakage detection device. Background Art

[0002] The arc extinguishing chamber is the core component of GIS (gas insulated switchgear) to realize the arc extinguishing function. When the circuit breaker or other switchgear in the GIS disconnects the circuit, the arc extinguishing chamber can quickly extinguish the generated arc to prevent the arc from damaging the equipment and system. If the insulating gas leakage in the arc extinguishing chamber is not discovered and handled in time, the insulation performance of the arc extinguishing chamber will be reduced and the arc extinguishing ability will be weakened, thereby causing flashover or breakdown inside the GIS, reducing the service life of the GIS and increasing the risk of power outages, resulting in huge losses.

[0003] There are some relevant documents for harmful gas detection. For example, patent document CN114487273A discloses a toxic gas detection device, including a box, a gas sensor, a gas collection chamber, a filter component, an operation control panel and an air pump; the gas sensor and the air pump are electrically connected to the operation control panel respectively, the gas sensor collects gas signals and transmits them to the operation control panel, and the operation control panel controls the working state of the air pump; the outer wall of the box is provided with an air inlet, and an air pump is provided between the connection between the filter component and the air inlet of the box, and the filter component is connected to the gas collection chamber; the air pump is controlled to quickly collect or discharge the gas to be measured outside the box, and the operation control panel displays the toxic gas data information; when toxic gas is detected, the operation control panel controls the sound and light alarm module to perform an alarm action to prompt the operator. However, the device mainly detects whether there is toxic gas through a "gas sensor", and it is unclear what model and detection principle it is, and it is difficult to accurately measure the concentration of the gas, especially the concentration ratio in the air.

[0004] Therefore, it is necessary to develop a device that can quickly and accurately detect the concentration of insulating gas leaking from the arc extinguishing chamber, so as to timely discover and warn of insulating gas leakage in the arc extinguishing chamber. Summary of the invention

[0005] The main purpose of this application is to provide an arc extinguishing chamber insulating gas leakage detection device, which can timely and accurately detect the concentration of insulating gas leaking from the arc extinguishing chamber. To achieve the above purpose, the technical solution of this application is as follows:

[0006] An arc extinguishing chamber insulating gas leakage detection device comprises: a shell with a cavity inside, an air chamber arranged in the shell, a gas receiving port arranged on the shell and connected to the air chamber, an infrared light processing module and a pyroelectric infrared detector respectively arranged at two ends of the shell, and an information processing module connected to the pyroelectric infrared detector. The gas receiving port is used to absorb the insulating gas leaked from the arc extinguishing chamber; the infrared light emitted by the infrared light processing module passes through the air chamber and is then received by the pyroelectric infrared detector; the information processing module is used to calculate the insulating gas concentration according to the intensity change of the infrared light after being emitted and received.

[0007] In at least one embodiment, the infrared light processing module includes an infrared light source and a light source modulation driving circuit connected to the infrared light source, the light source modulation driving circuit uses a square wave pulse to electrically modulate the infrared light source to generate two wavelengths in the range of 10.5 to 11.5 μm and 2300 to 2400 cm -1 The two optical paths are transmitted to the pyroelectric infrared detector, thereby forming a reference signal and a detection signal respectively. Furthermore, the infrared light processing module is connected to a single chip microcomputer, which is used to control the infrared light processing module to transmit infrared light, and the information processing module performs differential absorption calculation according to the two signals, thereby obtaining the concentration of the insulating gas in the air.

[0008] In at least one embodiment, the information processing module includes a signal filtering and amplifying circuit, an analog-to-digital converter and a processor; the signal filtering and amplifying circuit is connected to the output end of the pyroelectric infrared detector, and is used to filter and amplify the reference signal and the detection signal, and then transmit them to the analog-to-digital converter for analog-to-digital conversion, and finally transmit them to the processor. The processor performs differential absorption calculation based on the received digital signal, thereby calculating the concentration of the insulating gas in the air.

[0009] In at least one embodiment, the information processing module is connected to a display module, and the display module includes a display screen and its peripheral circuits, which are used to display the insulating gas concentration.

[0010] In at least one embodiment, the detection device further comprises a box, the box is used to accommodate the housing, the infrared light processing module, the pyroelectric infrared detector and the information processing module, the display screen of the display module is installed on the front of the box, and the gas receiving port is connected to a pipeline connected to the outside of the box. Furthermore, a handle is provided on the top of the box, a button for controlling the internal circuit is provided on the front, and wheels are provided on the bottom.

[0011] In at least one embodiment, the arc extinguishing chamber insulating gas leakage detection device further includes a gas monitoring module, which is used to drive the infrared light processing module to work when it detects changes in the insulating gas around the arc extinguishing chamber. Further, the gas monitoring module includes a non-spectral differential infrared absorption sensor.

[0012] In at least one embodiment, the information processing module is connected to a prompt module, which is used to issue an alarm when the insulating gas concentration is abnormal.

[0013] In at least one embodiment, a filter is further disposed in the housing, and the infrared light emitted by the infrared light processing module first passes through the filter and then enters the air chamber.

[0014] In at least one embodiment, the shell is also provided with an optical path transmission component, which includes a concave mirror arranged at both ends of the air chamber, and a concave mirror controller for controlling the curvature and / or spacing of the concave mirror.

[0015] Compared with the prior art, the present application achieves at least the following beneficial effects: 1. The equipment of the present application detects the leakage of insulating gas in the arc extinguishing chamber through infrared absorption spectroscopy, and has the advantages of high measurement accuracy, fast response speed, good stability performance, and strong anti-interference ability; 2. The infrared light source processing module of the present application adopts single-path dual-wavelength technology and square wave pulse electrolysis technology, which can eliminate noise interference, reduce the influence of stray light and eliminate the light interference of the sample itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments of the present application will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0017] Figure 1 A schematic diagram of the internal structure of an embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of the external structure of an embodiment of the present application;

[0019] Figure 3 A circuit block diagram of an embodiment of the present application;

[0020] Figure 4 This is a specific circuit diagram of an embodiment of the present application.

[0021] The numbers in the figure are: 1. Shell; 11. Air chamber; 12. Gas receiving port; 13. Flow controller; 2. Infrared light processing module; 21. Infrared light source; 22. Light source modulation drive circuit; 3. Pyroelectric infrared detector; 4. Single-chip microcomputer; 5. Information processing module; 51. Signal filtering and amplifying circuit; 52. Analog-to-digital converter; 53. Processor; 6. Display module; 7. Box; 71. Handle; 72. Button; 73. Wheel; 8. Prompt module; 9. Filter; 10. Optical path transmission component; 101. Concave mirror; 102. Concave mirror controller; 14. Gas monitoring module. DETAILED DESCRIPTION

[0022] The present application will be described in detail below with reference to the exemplary embodiments in the accompanying drawings. However, it should be understood that the present application can be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. These embodiments are provided here to make the application content of the present application more complete and to fully convey the concept of the present application to those skilled in the art.

[0023] In the description of the present application, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0024] like Figures 1 to 3 As shown, in at least one of the arc extinguishing chamber insulating gas leakage detection devices of this embodiment, it includes: a shell 1 with a cavity inside, a gas chamber 11 arranged in the shell, a gas receiving port 12 arranged on the shell 1 and connected to the gas chamber 11, an infrared light processing module 2 and a pyroelectric infrared detector 3 respectively arranged at both ends of the shell 1, and an information processing module 5 connected to the pyroelectric infrared detector 3. Among them, the gas receiving port 12 is used to absorb the insulating gas leaked from the arc extinguishing chamber; the infrared light emitted by the infrared light processing module 2 passes through the gas chamber 11 and is then received by the pyroelectric infrared detector 3; the information processing module 5 is used to calculate the insulating gas concentration according to the intensity change of the infrared light after being emitted and received. In this way, the information processing module 5 can detect the insulating gas leakage of the arc extinguishing chamber by infrared absorption spectroscopy, so as to determine whether the insulating gas concentration reaches a dangerous concentration (for example, the insulating gas concentration accounts for 10% of the air).

[0025] The infrared light processing module 2 includes an infrared light source 21 and a light source modulation driving circuit 22 connected to the infrared light source 21. The light source modulation driving circuit 22 uses a square wave pulse with a frequency of 4 Hz to electrically modulate the infrared light source 21 to generate two wavelengths in the range of 10.5 to 11.5 μm and 2300 to 2400 cm -1 The two light paths are transmitted to the pyroelectric infrared detector 3, thereby forming a reference signal and a detection signal respectively.

[0026] In addition, the infrared light processing module 2 is also connected to a single-chip microcomputer 4, which is used to control the infrared light processing module 2 to transmit infrared light; obviously, the single-chip microcomputer 4 can also be used to control other electronic components, such as the flow controller 13 and the concave mirror controller 102 described later. The present application transmits infrared light through a single-chip microcomputer control system, which can avoid errors in the results caused by human intervention and improve the accuracy of the detection results.

[0027] The infrared light source processing module 2 adopts electrical modulation technology and single optical path dual wavelength technology. Referring to other relevant literature in this field, the operation of 4Hz square wave pulse electrical modulation technology requires the installation of electronic components such as pulse signal generator, drive circuit, feedback and protection circuit. Electrical modulation mainly controls the output characteristics of the infrared light source through electrical modulation technology, so that the infrared light emitted by it absorbs a specific wavelength when passing through the gas to be measured, and then calculates the concentration of the gas to be measured by detecting and processing the absorbed infrared light signal. The infrared light source processing module changes the radiation intensity of the light source by controlling the current input of the light source to ensure that the wavelength of the emitted infrared light is within the infrared absorption peak of the leaking arc extinguishing chamber insulating gas (sulfur hexafluoride is about 10.5 to 11.5 microns and nitrogen is 2300 to 2400cm -1 ) range. The infrared light signal emitted according to the infrared wavelength modulation of the leaked arc extinguishing chamber insulating gas can enhance the system's recognition ability of the modulated infrared light signal. The system can detect the specific characteristics of the modulated infrared light signal (such as frequency, phase, pulse coding, etc.) to distinguish the target signal from the background noise or interference signal, thereby enhancing the anti-interference ability of infrared light transmission, thereby improving the accuracy of arc extinguishing chamber insulating gas leakage detection.

[0028] The infrared light source processing module 2 also adopts a single optical path dual wavelength technology. In terms of the emitted infrared wavelength, two specific wavelengths of light sources can be selected according to the range of the infrared absorption peak of the leaked arc extinguishing chamber insulating gas, one wavelength for the stronger absorption of the leaked arc extinguishing chamber insulating gas molecules and the other wavelength as a reference. By comparing the changes in the optical signals at two different wavelengths, the concentration of the leaked arc extinguishing chamber insulating gas can be determined more accurately.

[0029] In one embodiment, a filter 9 is further provided in the housing 1, and the infrared light emitted by the infrared light processing module 2 first passes through the filter 9 and then enters the air chamber 11. The filter 9 is preferably a metamaterial filter, which achieves precise control and selective transmission or reflection of light by combining the interference, diffraction, absorption and reflection of light and the special properties of metamaterials. The metamaterial filter achieves selective transmission of sulfur hexafluoride (about 10.5-11.5 microns) and nitrogen (2300-2400cm) through its special microstructure and materials. -1 That is, when infrared light is irradiated onto the metamaterial filter, only the infrared wavelength of the leaked arc extinguishing chamber insulating gas that meets specific conditions can pass through.

[0030] In one embodiment, the housing 1 is also provided with an optical path transmission component 10, which includes a concave mirror 101 disposed at both ends of the air chamber 11, and a concave mirror controller 102 for controlling the curvature and spacing of the concave mirror 101. Generally speaking, the concave mirror controller 102 should be able to at least control the spacing between the two concave mirrors 101, thereby controlling the travel of light propagation; for example, the concave mirror controller 102 can be provided by using two sliders disposed on an electric slide rail, and then installing the concave mirror 101 on the slider. According to the Lambert-Beer law, it can be known that the degree of absorption of infrared light energy by a substance is not only related to the concentration of the substance, but also to the distance traveled by the light in the substance. Therefore, the present application installs concave mirrors at both ends of the air chamber, and installs a concave mirror controller outside the air chamber, and the curvature and spacing of the concave mirror can be adjusted by the concave mirror controller to achieve different reflection times and optical paths. The surface of the concave mirror can be made of microstructured material, which can enhance the reflectivity and reduce reflection loss.

[0031] In one embodiment, the information processing module 5 includes a signal filtering and amplifying circuit 51, an analog-to-digital converter 52, and a processor 53; the signal filtering and amplifying circuit 51 is connected to the output end of the pyroelectric infrared detector 3, and is used to filter and amplify the reference signal and the detection signal, and then transmit them to the analog-to-digital converter 52 for analog-to-digital conversion, and finally transmit them to the processor 53, and the processor 53 performs differential absorption calculation based on the received digital signal, thereby calculating the concentration of the insulating gas in the air. In addition, the information processing module 5 is connected to a display module 6, and the display module 6 includes a display screen and its peripheral circuits, which are used to display the insulating gas concentration. In addition, the information processing module 5 is connected to a prompt module 8, which is used to sound an alarm when the insulating gas concentration is abnormal.

[0032] During the detection process, the pyroelectric infrared detector converts the photothermal signal into an electrical signal to form a reference signal and a detection signal (corresponding to two optical paths), and then transmits the reference signal and the detection signal to the information processing module 5. The information processing module 5 includes a signal filtering and amplifying circuit 51, an analog-to-digital converter (ADC) 52 and a processor 53. The processor 53 performs differential absorption calculation on the digital signal after filtering, amplification and analog-to-digital conversion, thereby calculating the concentration of the insulating gas in the air. The processor 53 can also be connected to a communication circuit, and the calculation result is transmitted to the prompt module 8 and the display module 5 through the communication circuit. If the insulating gas concentration in the arc extinguishing chamber reaches a preset value (for example, the insulating gas accounts for 10% of the air), the prompt module (generally selected as a buzzer or indicator light) will give an alarm prompt. The display screen of the display module can be used to display the insulating gas concentration leaked in the arc extinguishing chamber, alarm information and equipment status, etc.

[0033] In one embodiment, the arc extinguishing chamber insulating gas leakage detection device also includes a gas monitoring module 14, which is used to drive the infrared light processing module 2 to work when insulating gas is detected in the air. Specifically, the gas monitoring module 14 includes a non-spectral differential infrared absorption sensor, and is further connected to a driving circuit. The non-spectral differential infrared absorption sensor monitors the changes in the insulating gas around the arc extinguishing chamber, and transmits the monitored signal to the information processing module. After receiving the signal, the information processing module outputs a driving signal to the driving circuit. After receiving the driving signal, the driving circuit drives the arc extinguishing chamber insulating gas monitoring electrical equipment to work. More specifically, the driving circuit at least drives the infrared light processing module to emit infrared light, and can also drive the receiving port 12 to start gas suction and flow control, as well as drive other modules to work. The gas monitoring module 14 is mainly used to monitor whether there is insulating gas leakage. Due to its insufficient accuracy and possible errors, it is necessary to perform more accurate measurements after other modules work, and finally decide whether to issue an alarm signal based on the accurate measurement value.

[0034] In one embodiment, the detection device may also include a box 7 for protection and avoiding the influence of external light. The box 7 is used to accommodate the shell 1, the infrared light processing module 2, the pyroelectric infrared detector 3 and the information processing module 5, etc. The display screen of the display module 6 is installed on the front of the box 7, and the gas receiving port 12 is connected to a pipeline connected to the outside of the box 7. A handle 71 is provided on the top of the box 7, a button 72 for controlling the internal circuit is provided on the front, and wheels 74 are provided on the bottom to facilitate movement and transportation. A flow controller 13 and a suction pump may also be provided on the external pipeline of the gas receiving port 12. The flow controller can accurately control the flow rate of the leaked arc extinguishing chamber insulating gas entering the gas chamber to ensure the stability of the concentration and pressure of the insulating gas in the gas chamber, so as to facilitate the stable control of the suction of external gas.

[0035] It should be understood that the electronic components involved in this application are not limited to a specific model, and any components that can realize its functions can be used, for example: an infrared light source can use an infrared light-emitting diode; the light source modulation drive circuit can generate a square wave pulse signal through a conventional clock circuit, control the drive radio and television coupler, and then start the power field corresponding tube, and finally realize the lighting and extinguishing of the light-emitting diode; the signal filtering and amplifying circuit can choose to use an integrated operational amplifier AD8517 and other circuits; the analog-to-digital converter can use various ADC converters or ADC conversion modules integrated into the processor; the processor can use various processing units with operating functions, such as TMS320F28335 model DSP; the display module can use an LED module; the prompt module can use a buzzer or a music chip with voice function to form a circuit, or it can use a circuit composed of LED lights of various colors.

[0036] For details, please refer to Figure 4 , the present application also provides an implementation as a reference. In this implementation, the internal circuit of the entire detection device includes at least a power module, a gas monitoring module, an infrared light processing module, a differential operation circuit, and a gas concentration approaching alarm circuit. The power module is based on the 74241 chip and is responsible for power supply. The gas monitoring module is based on the 74238 chip and is used to drive the infrared light processing module to emit infrared light when leaked gas is detected. The infrared light passes through the gas chamber and is received by the dual-channel pyroelectric infrared detector, and finally forms a reference digital signal and a detection digital signal. The infrared light processing module is based on the 7400 chip, and the circuit also includes a light-emitting diode, two triodes and several resistors. The differential operation circuit includes at least one 74465 chip, an operational amplifier and several resistors and other electronic components, which are responsible for differential operation of the reference digital signal and the detection signal, and the differential operational amplifier circuit transmits the result to the concentration approaching alarm circuit. The concentration approaching alarm circuit is based on the 7405 chip, and the circuit starts to alarm when the gas approaches the critical point set.

[0037] It should be understood that all the above embodiments are illustrative rather than restrictive, and various modifications or variations made by those skilled in the art to the specific embodiments described above based on the concept of the present application should all be within the protection scope of the present application.

Claims

1. An arc extinguishing chamber insulating gas leakage detection device, characterized in that: include: A shell (1) having a cavity therein, an air chamber (11) provided in the shell, a gas receiving port (12) provided on the shell (1) and connected to the air chamber (11), an infrared light processing module (2) and a pyroelectric infrared detector (3) respectively provided at two ends of the shell (1), and an information processing module (5) connected to the pyroelectric infrared detector (3); The gas receiving port (12) is used to absorb insulating gas leaking from the arc extinguishing chamber; the infrared light emitted by the infrared light processing module (2) passes through the gas chamber (11) and is then received by the pyroelectric infrared detector (3); the information processing module (5) is used to calculate the insulating gas concentration based on the intensity change of the infrared light after being emitted and received.

2. The arc extinguishing chamber insulating gas leakage detection device according to claim 1, characterized in that: The infrared light processing module (2) comprises an infrared light source (21) and a light source modulation driving circuit (22) connected to the infrared light source (21); the light source modulation driving circuit (22) uses square wave pulses to electrically modulate the infrared light source (21) to generate two wavelengths in the range of 10.5 to 11.5 μm and 2300 to 2400 cm -1 The two optical paths are transmitted to the pyroelectric infrared detector (3), thereby respectively forming a reference signal and a detection signal, and the information processing module (5) performs differential absorption calculation based on the two signals, thereby obtaining the concentration of the insulating gas in the air.

3. The arc extinguishing chamber insulating gas leakage detection device according to claim 1 or 2, characterized in that: The infrared light processing module (2) is connected to a single chip computer (4) which is used to control the infrared light processing module (2) to transmit infrared light.

4. The arc extinguishing chamber insulating gas leakage detection device according to claim 2, characterized in that: The information processing module (5) comprises a signal filtering and amplifying circuit (51), an analog-to-digital converter (52) and a processor (53); the signal filtering and amplifying circuit (51) is connected to the output end of the pyroelectric infrared detector (3) and is used to filter and amplify the reference signal and the detection signal, and then transmit them to the analog-to-digital converter (52) for analog-to-digital conversion, and finally transmit them to the processor (53). The processor (53) performs differential absorption calculation based on the received digital signal, thereby obtaining the concentration of the insulating gas in the air.

5. The arc extinguishing chamber insulating gas leakage detection device according to claim 1, characterized in that: The information processing module (5) is connected to a display module (6), and the display module (6) comprises a display screen and its peripheral circuits, and is used to display the insulating gas concentration.

6. The arc extinguishing chamber insulating gas leakage detection device according to claim 5, characterized in that: The invention also comprises a box (7), the top of which is provided with a handle (71), the front of which is provided with a button (72) for controlling the internal circuit, and the bottom of which is provided with wheels (73); the box (7) is used to accommodate the housing (1), the infrared light processing module (2), the pyroelectric infrared detector (3) and the information processing module (5); the display screen of the display module (6) is installed on the front of the box (7); and the gas receiving port (12) is connected to a pipeline connected to the outside of the box (7).

7. The arc extinguishing chamber insulating gas leakage detection device according to claim 1, characterized in that: It also includes a gas monitoring module (14) which is used to drive the infrared light processing module (2) to start working when it detects changes in the insulating gas around the arc extinguishing chamber.

8. The arc extinguishing chamber insulating gas leakage detection device according to claim 1, characterized in that: The information processing module (5) is connected to a prompt module (8) which is used to issue an alarm sound when the insulating gas concentration is abnormal.

9. The arc extinguishing chamber insulating gas leakage detection device according to claim 1, characterized in that: A filter (9) is also provided in the housing (1), and the infrared light emitted by the infrared light processing module (2) first passes through the filter (9) and then enters the air chamber (11).

10. The arc extinguishing chamber insulating gas leakage detection device according to claim 1, characterized in that: The housing (1) is also provided with an optical path transmission component (10), which comprises concave mirrors (101) arranged at both ends of the air chamber (11), and a concave mirror controller (102) for controlling the curvature and / or spacing of the concave mirror (101).

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