SF6 gas decomposer concentration monitoring system

Abstract

According to the SF6 gas decomposer concentration monitoring system provided by the invention, a temperature controller is used for acquiring a current environment temperature signal, generating a temperature compensation control signal according to the temperature signal and sending the temperature compensation control signal to a quantum cascade laser, and an output end of a current tuning driver outputs a driving signal to the quantum cascade laser; the controller controls the current tuning driver to generate a driving signal, an output port of the quantum cascade laser outputs a laser signal to the angle-adjustable reflecting surface, the laser signal is reflected by the angle-adjustable reflecting surface and then is output to the multi-pass reflecting pool, and detected SF6 gas is input into the multi-pass reflecting pool. The multi-layer reflection pool reflects laser for multiple times and then outputs the laser to the detector, the detector converts reflected laser signals into electric signals and outputs the electric signals to the lock-in amplifier, the lock-in amplifier processes the electric signals and then outputs the electric signals to the controller, and the controller recognizes the electric signals output by the lock-in amplifier to obtain the concentration of SF6 gas decomposers.

Description

Technical Field

[0001] The invention relates to a gas concentration detection system, in particular to a SF6 gas decomposition product concentration monitoring system. Background Art

[0002] Sulfur hexafluoride (chemical formula: SF6) gas, as an excellent insulating and arc-extinguishing medium, is widely used in various electrical equipment such as sulfur hexafluoride gas insulated circuit breakers, gas insulated switchgear (GIS), transformers, mutual inductors, power cables, etc.

[0003] In electrical equipment that has been in operation for a long time, SF6 gas will decompose under the action of high-voltage arc or high-energy factors, producing compounds such as hydrogen fluoride (HF), sulfur dioxide (SO2), hydrogen sulfide (H2S), carbon monoxide (CO), sulfinyl fluoride (SOF2), and sulfuryl fluoride (SO2F2). These decomposition products are of great significance for the judgment of potential failures of electrical equipment. At the same time, most of these decomposition products are highly toxic substances, which will cause harm to different parts of the human body and threaten human life in severe cases.

[0004] In the existing technology, the monitoring methods for SF6 gas decomposition products include nuclear magnetic resonance spectroscopy technology, chromatography, spectroscopy and mass spectrometry technology. However, nuclear magnetic resonance technology can only be performed in the laboratory and is difficult to promote. The existing chromatography, mass spectrometry, spectroscopy and other precision instruments are more suitable for use in the laboratory and are not suitable for field use. In addition, the existing spectral technology cannot detect SO2 and H2S, the important characteristic components of SF6.

[0005] Therefore, in order to solve the above technical problems, it is urgent to propose a new technical means. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a SF6 gas decomposition product concentration monitoring system, which can accurately monitor the concentration of SF6 gas decomposition products in industrial sites by spectral analysis, and can also monitor the important characteristic components SO2 and H2S in SF6 gas, with less environmental interference, high accuracy and long service life.

[0007] The present invention provides a SF6 gas decomposition product concentration monitoring system, comprising a controller, a quantum cascade laser, a current tuning driver, a temperature controller, a detector, a lock-in amplifier, an angle-adjustable reflection surface, and a multi-pass reflection pool;

[0008] The temperature controller is used to obtain the current ambient temperature signal and generate a temperature compensation control signal according to the temperature signal and send it to the quantum cascade laser. The output end of the current tuning driver outputs a driving signal to the quantum cascade laser. The controller controls the current tuning driver to generate a driving signal. The output port of the quantum cascade laser outputs a laser signal to the angle-adjustable reflection surface and outputs it to the multi-pass reflection pool after being reflected by the angle-adjustable reflection surface. The SF6 gas to be measured is input into the multi-layer reflection pool. The multi-layer reflection pool reflects the laser for multiple times and then outputs it to the detector. The detector converts the reflected laser signal into an electrical signal and outputs it to the lock-in amplifier. The lock-in amplifier processes the electrical signal and then outputs it to the controller. The controller identifies the electrical signal output by the lock-in amplifier to obtain the concentration of the SF6 gas decomposition product.

[0009] Further, the multi-pass reflecting pool includes a shell, a first reflecting surface and a second reflecting surface;

[0010] The first reflecting surface and the second reflecting surface are both arranged in the shell, the first reflecting surface and the second reflecting surface are both concave arc surfaces and the concave arc surfaces are directly opposite to each other, and the size of the first reflecting surface is larger than that of the second reflecting surface.

[0011] Furthermore, it also includes a remote monitoring center, which includes a monitoring host, a touch display and a storage server;

[0012] The monitoring host is connected to the controller for communication, the touch display is connected to the monitoring host for communication, and the storage server is connected to the monitoring host for communication.

[0013] Furthermore, the monitoring host is connected to the controller through a wireless communication module.

[0014] Furthermore, the wireless communication module is a 5G module or a UWB module.

[0015] Furthermore, it also includes a position sensor, which is used to calibrate the position of the current monitoring point, and the output end of the position sensor is connected to the controller.

[0016] Furthermore, the position sensor is a Beidou positioning module or a GPS positioning module.

[0017] The beneficial effects of the present invention are as follows: through the present invention, the concentration of SF6 gas decomposition products can be accurately monitored at industrial sites by means of spectral analysis, and the important characteristic components SO2 and H2S in SF6 gas can also be monitored, with less environmental interference, high accuracy, and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0019] Figure 1 It is a schematic diagram of the structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the structure of the multi-pass reflecting pool of the present invention. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below:

[0022] The present invention provides a SF6 gas decomposition product concentration monitoring system, comprising a controller, a quantum cascade laser, a current tuning driver, a temperature controller, a detector, a lock-in amplifier, an angle-adjustable reflection surface 4 and a multi-pass reflection pool;

[0023] The temperature controller is used to obtain the current ambient temperature signal and generate a temperature compensation control signal according to the temperature signal and send it to the quantum cascade laser. The output end of the current tuning driver outputs a driving signal to the quantum cascade laser. The controller controls the current tuning driver to generate a driving signal. The output port of the quantum cascade laser outputs a laser signal to the angle-adjustable reflection surface and outputs it to the multi-pass reflection pool after being reflected by the angle-adjustable reflection surface. The SF6 gas to be measured is input into the multi-layer reflection pool. The multi-layer reflection pool reflects the laser for multiple times and then outputs it to the detector. The detector converts the reflected laser signal into an electrical signal and outputs it to the lock-in amplifier. The lock-in amplifier processes the electrical signal and then outputs it to the controller. The controller identifies the electrical signal output by the lock-in amplifier to obtain the concentration of the SF6 gas decomposition product. Among them, the quantum cascade laser (QCL) is a laser that only involves electrons in the stimulated radiation process. Its lasing scheme uses the particle number inversion between separated electronic states caused by the quantum confinement effect in the semiconductor heterojunction thin layer to achieve multi-photon output of single electron injection, and can easily change the emission wavelength by changing the thickness of the quantum well layer. It can provide an ultra-wide spectral range and excellent wavelength tunability; the current tuning driver, temperature controller, detector and lock-in amplifier all use existing technologies, and their principles are not described here. Among them, the temperature signal is obtained by the temperature sensor.

[0024] Among them, the detector adopts an infrared detector. For SO2 gas, its absorption band in the infrared is mainly distributed around 7μm~8μm in the mid-infrared region, and the ideal band for SO2 detection is in the range of 7.1μm~7.3μm; for H2S gas, its absorption band in the infrared is mainly distributed around 2.5μm~3μm in the near-infrared region and 7μm~9μm in the mid-infrared region, and the ideal band for H2S detection is in the range of 7.5μm~7.7μm.

[0025] The angle-adjustable reflective surface adopts a high-reflectivity reflective surface. The angle of the reflective surface is adjustable by setting the reflective surface on an existing ball hinge, which is convenient for adjusting the incident angle of the laser on the multi-pass reflective pool. Through the present invention, the concentration of SF6 gas decomposition products can be accurately monitored at the industrial site by spectral analysis, and the important characteristic components SO2 and H2S in the SF6 gas can also be monitored. It is less affected by the environment, has high accuracy, and has a long service life.

[0026] In this embodiment, the multi-pass reflecting pool includes a shell 1, a first reflecting surface 5 and a second reflecting surface 3;

[0027] The first reflecting surface 5 and the second reflecting surface 3 are both arranged in the shell 1. The first reflecting surface 5 and the second reflecting surface 3 are both concave arc surfaces and the concave arc surfaces are directly opposite. The size of the first reflecting surface 5 is larger than the second reflecting surface 3. Through the above structure, the sensitivity of gas concentration detection can be improved and the accuracy can be guaranteed. In order to improve the sensitivity, a plane reflecting mirror 4 can be added. The plane reflecting mirror 4 is located on the same side as the second reflecting surface 3 and is placed below the second reflecting surface, so as to perform reflection compensation. Figure 2 shown.

[0028] In this embodiment, a remote monitoring center is also included, and the remote monitoring center includes a monitoring host, a touch display and a storage server;

[0029] The monitoring host is communicatively connected to the controller, the touch display is communicatively connected to the monitoring host, and the storage server is communicatively connected to the monitoring host. The touch display is used to display the analysis process and results. The analysis process adopts existing technology. The storage server is used to store data and call historical data.

[0030] Wherein: the monitoring host is connected to the controller through a wireless communication module.

[0031] The wireless communication module is a 5G module or a UWB module.

[0032] In this embodiment, a position sensor is also included. The position sensor is used to calibrate the position of the current monitoring point, and the output end of the position sensor is connected to the controller.

[0033] The position sensor is a Beidou positioning module or a GPS positioning module. The position of the current monitoring point is calibrated by the position sensor to facilitate subsequent maintenance and processing.

[0034] in, Figure 1 and Figure 2 The dotted lines in the figure represent light rays.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A SF6 gas decomposition product concentration monitoring system, characterized in that: It includes a controller, a quantum cascade laser, a current tuning driver, a temperature controller, a detector, a lock-in amplifier, an angle-adjustable reflection surface, and a multi-pass reflection pool; The temperature controller is used to obtain the current ambient temperature signal and generate a temperature compensation control signal according to the temperature signal and send it to the quantum cascade laser. The output end of the current tuning driver outputs a driving signal to the quantum cascade laser. The controller controls the current tuning driver to generate a driving signal. The output port of the quantum cascade laser outputs a laser signal to the angle-adjustable reflection surface and outputs it to the multi-pass reflection pool after being reflected by the angle-adjustable reflection surface. The SF6 gas to be measured is input into the multi-layer reflection pool. The multi-layer reflection pool reflects the laser for multiple times and then outputs it to the detector. The detector converts the reflected laser signal into an electrical signal and outputs it to the lock-in amplifier. The lock-in amplifier processes the electrical signal and then outputs it to the controller. The controller identifies the electrical signal output by the lock-in amplifier to obtain the concentration of the SF6 gas decomposition product.

2. The SF6 gas decomposition product concentration monitoring system according to claim 1, characterized in that: The multi-pass reflecting pool comprises a shell, a first reflecting surface and a second reflecting surface; The first reflecting surface and the second reflecting surface are both arranged in the shell, the first reflecting surface and the second reflecting surface are both concave arc surfaces and the concave arc surfaces are directly opposite to each other, and the size of the first reflecting surface is larger than that of the second reflecting surface.

3. The SF6 gas decomposition product concentration monitoring system according to claim 1, characterized in that: It also includes a remote monitoring center, which includes a monitoring host, a touch display and a storage server; The monitoring host is connected to the controller for communication, the touch display is connected to the monitoring host for communication, and the storage server is connected to the monitoring host for communication.

4. The SF6 gas decomposition product concentration monitoring system according to claim 3 is characterized in that: The monitoring host is connected to the controller through a wireless communication module.

5. The SF6 gas decomposition product concentration monitoring system according to claim 4, characterized in that: The wireless communication module is a 5G module or a UWB module.

6. The SF6 gas decomposition product concentration monitoring system according to claim 1, characterized in that: It also includes a position sensor, which is used to calibrate the position of the current monitoring point, and the output end of the position sensor is connected to the controller.

7. The SF6 gas decomposition product concentration monitoring system according to claim 6, characterized in that: The position sensor is a Beidou positioning module or a GPS positioning module.

Images