JP4712438B2 - Gas leak visualization device - Google Patents

Description

The present invention relates to a gas leak visualization apparatus that enables gas leaks from SF ₆ gas insulation equipment to be confirmed with the human eye.

As a first typical method for detecting a conventional SF ₆ gas leak, there is a so-called accumulation method. This accumulation method is a method in which a gas insulating device to be detected for gas leakage is wound with vinyl , a small amount of SF ₆ gas leakage is concentrated inside the vinyl, and then the concentrated SF ₆ gas is ionized and detected.

In addition, as a second method of detecting a conventional SF ₆ gas leak, the atmosphere around the gas insulation device is repeatedly sampled inside the photoacoustic cell, and light having a wavelength of 10.6 μm (SF ₆ gas spectral absorption wavelength 10.6 [mu] m) were pulsed manner transmits a detection methods research level leakage of SF ₆ gas traces by SF ₆ gas target gas to detect the sound emitted when absorbing light at the microphone (See, for example, Non-Patent Document 1).

Furthermore, as a third method for detecting SF ₆ gas leakage in the prior art, a laser that uses the spectral absorption of the SF ₆ gas, radiates high-power laser light into a three-dimensional space, and diffusely reflects the surrounding structure. A method of detecting leakage of SF ₆ gas by confirming the presence or absence of spectral absorption of light has been disclosed (see, for example, Non-Patent Document 2).

"Prediction diagnosis of insulation degradation by laser spectroscopy", [online], Laser Technology Research Institute, [Search April 20, 2005], Internet <URL: http: www.ilt.or.jp/menu /6-3.html> Tom McRae, “GasVue and the Magnesium Industry: Advanced SF6 Leak Detection”, [online], November 2-3, 2000, US EPRI solution, Inc. [Search April 20, 2005] Internet <URL: http: www.epa.gov/highgwp/electricpower-sf6/pdf/mcraeppt.pdf>

The above-mentioned conventional first typical method takes a long time to wind the vinyl tape and concentrate the SF ₆ gas, requires a long time for inspection, and leaks from any part of the gas insulation equipment. However, there is a case where it is necessary to make a detailed diagnosis with a more complicated work process, and there is a problem that it is necessary to speed up the work from gas leak detection to repair. .

  In the method of Non-Patent Document 1, in order to use spectral absorption, the complexity of repeatedly sampling the atmosphere around the gas insulation device, which is a three-dimensional large-scale structure, into the photoacoustic cell is a major obstacle. There is a problem of becoming.

  The method of Non-Patent Document 2 requires a high-power laser light source and a large-scale device for confirming the presence or absence of spectral absorption of laser light diffusely reflected from surrounding structures, and increases the output of the laser light. There is a problem that there is a danger to the human body.

  The present invention solves the above-described problems, and has a simple configuration and can easily detect a gas leak and specify a leak location with a simple operation. Moreover, the gas leak visualization apparatus has no danger to the human body. The purpose is to provide.

Gas leak visualization device according to the present invention includes a far infrared light source wavelength radiating far infrared light including far-infrared light in the far-infrared light or 10.6 [mu] m of 10.6 [mu] m,
Opposite the far-infrared light source and adjacently arranged on a straight line across the measurement space, receive far-infrared light emitted from the far-infrared light source through the measurement space, and the wavelength is 10.6 μm. and the far-infrared filter that transmits only infrared light,
A far-infrared photoelectric element that is disposed on the opposite side of the far-infrared filter and detects far-infrared light transmitted through the far-infrared filter;
Comprising the far-infrared transportable measuring probe the output of the photoelectric element integrating the processing and display device for converting a screen displayed on the screen display signal,
The measurement probe is brought close to the site where gas leakage of the SF ₆ gas insulation device is to be detected , the output from the far infrared photoelectric element is displayed on the processing / display device, and the measurement space from the SF ₆ gas insulation device is displayed. The presence of SF ₆ coming in is detected.

  According to the gas leak visualization apparatus according to the present invention, it is possible to identify the gas leak detection site with a simple configuration and simple operation, to speed up the repair work, and to the human body. It can be set as the gas leak visualization apparatus without the danger of.

  Moreover, since it is a simple structure, it can be made portable.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing Embodiment 1 of a gas leak visualization apparatus according to the present invention. As shown in FIG. 1, the gas leakage visualization apparatus according to Embodiment 1 includes a measurement probe 1.

The measurement probe 1 includes a far-infrared light source 2 that emits far-infrared light 10 including far-infrared light of 10.6 μm that is the spectral absorption wavelength of the SF ₆ gas 20, and far-red light emitted from the far-infrared light source 2. Far-infrared filter 3 that receives external light through space, far-infrared photoelectric element 4 that detects far-infrared light that has passed through far-infrared filter 3, and the output of far-infrared photoelectric element 4 is converted into a screen display signal. Then, a processing / display device 5 for displaying output intensity information by color display, numerical display, level display by a bar graph, or the like is provided.

As far-infrared light radiated from the far-infrared light source 2 to the space, only the far-infrared light of 10.6 μm is selected by the far-infrared filter 3 and enters the far-infrared photoelectric element 4. In such a configuration, when the measurement probe 1 is brought close to a portion where gas leakage of the gas insulation device is desired to be detected, if there is a gas leakage, the far infrared light source 2, the far infrared filter 3, and the far infrared photoelectric element. SF ₆ gas arrives in the space between the four pairs, 10.6 μm of far-infrared light is absorbed by SF ₆ gas, and the output of the far-infrared photoelectric element 4 decreases.

  According to the first embodiment, it is possible to identify a gas leak detection site with a simple configuration and simple operation, to speed up the work from gas leak detection to repair, and It is possible to provide a gas leakage visualization device that is free from danger to the human body.

  Moreover, since it is a simple structure, it can be made portable.

Embodiment 2. FIG.
In the first embodiment, the SF ₆ gas leakage is visualized by a decrease in the output of the far-infrared photoelectric element 4, but the far-infrared photoelectric leak is also caused by the deterioration or fouling of the far-infrared light source 2 and the entry of foreign matter into the space. The output of the element 4 is reduced.

FIG. 2 is a perspective view showing Embodiment 2 of the gas leakage visualization apparatus according to the present invention. As shown in FIG. 2, in the second embodiment, in addition to the configuration of the first embodiment, a second far-infrared filter that receives far-infrared light emitted from the far-infrared light source 2 into space. 7. A second far-infrared photoelectric element 6 that detects far-infrared light that has passed through the second far-infrared filter 7 and a correction device 8 are provided. The second far-infrared filter 7 transmits far-infrared light other than 10.6 μm far-infrared light that is not absorbed by the SF ₆ gas. The correction device 8 corrects the output of the far infrared photoelectric element 4. That is, for example, when a foreign substance arrives in the space and the output of the far-infrared photoelectric element 4 and the output of the second far-infrared photoelectric element 6 decrease in the same way, the output of the far-infrared photoelectric element 4 Then, the correction value is added by the correction device 8 and the processing / display device 5 is displayed with no leakage of SF ₆ gas. When the output of the second far-infrared photoelectric element 6 does not decrease and only the output of the far-infrared photoelectric element 4 decreases, the correction device 8 corrects the output of the far-infrared photoelectric element 4. Is displayed on the processing / display device 5 indicating that SF ₆ gas has leaked.

  As described above, according to the second embodiment, it is possible to suppress misjudgment due to factors other than gas leakage such as deterioration and contamination of the far-infrared light source 2 and entry of foreign matter into the space, and visualize only gas leakage. Can do.

Embodiment 3 FIG.
3 and 4 are plan views showing Embodiment 3 of the gas leak visualization apparatus according to the present invention.

  In the first and second embodiments, an example in which the far-infrared photoelectric element 4 is one is shown. However, in the third embodiment, as shown in FIGS. 3 and 4, a far-infrared filter and a far-infrared filter are used. The pairs of photoelectric elements are arranged in a matrix of m rows × n columns, and the photoelectric element picture elements 9 displayed by the processing / display device by the output of the far infrared photoelectric elements are specified by (m, n). In the figure, a matrix of 5 rows × 5 columns is illustrated.

FIG. 4 shows a state where a gas leak is detected and displayed. In the figure, the black portion shows a higher detected concentration of SF ₆ gas, the shaded portion shows a lower detected concentration of SF ₆ gas than the black portion, and the white portion shows a portion where SF ₆ gas is not detected. . In the same figure, the SF ₆ gas leaked from the black coating portion (5, 2) is shown to spread toward the upper shaded portion.

  As described above, according to the third embodiment, it is possible to pinpoint the gas leakage portion and to confirm the aspect of gas leakage.

  In the first to third embodiments, the far-infrared light source may be a light source that emits only 10.6 μm far-infrared light, but the far-infrared filter is indispensable if the influence of external light or the like is taken into consideration. Is.

The gas leak visualization device according to the present invention can be effectively used to detect in which part gas leak from the SF ₆ gas insulation device is generated and to be confirmed with the human eye.

It is a perspective view which shows Embodiment 1 of the gas leak visualization apparatus which concerns on this invention. It is a perspective view which shows Embodiment 2 of the gas leak visualization apparatus which concerns on this invention. It is a top view which shows Embodiment 3 of the gas leak visualization apparatus which concerns on this invention. It is a top view which shows Embodiment 3 of the gas leak visualization apparatus which concerns on this invention.

Explanation of symbols

1 measurement probe, 2 far infrared light source, 3 far infrared filter, 4 far infrared photoelectric element,
5 processing / display device, 6 second far infrared photoelectric element, 7 second far infrared filter,
8 Correction device, 9 Photoelectric element picture element, 10 Far infrared light, 20 Leakage SF ₆ .

Claims (3)

And far-infrared light source wavelength radiating far infrared light including far-infrared light in the far-infrared light or 10.6 [mu] m of 10.6 [mu] m,
Opposite the far-infrared light source and adjacently arranged on a straight line across the measurement space, receive far-infrared light emitted from the far-infrared light source through the measurement space, and the wavelength is 10.6 μm. and the far-infrared filter that transmits only infrared light,
A far-infrared photoelectric element that is disposed on the opposite side of the far-infrared filter and detects far-infrared light transmitted through the far-infrared filter;
Comprising the far-infrared transportable measuring probe the output of the photoelectric element integrating the processing and display device for converting a screen displayed on the screen display signal,
The measurement probe is brought close to a part where SF ₆ gas insulation equipment is desired to detect gas leakage, the output from the far-infrared photoelectric device is displayed on the processing / display device, and the measurement is performed from the SF ₆ gas insulation equipment. A gas leak visualization apparatus, characterized by detecting the presence of SF ₆ arriving in space. The measurement probe receives far-infrared light including 10.6 μm far-infrared light emitted from the far-infrared light source through the measurement space, and the wavelength emitted by the far-infrared light source is 10. The far-infrared light that forms a pair with the second far-infrared filter that transmits far-infrared light other than 6 μm far-infrared light and the second far-infrared filter, and that has passed through the second far-infrared filter. A second far-infrared photoelectric element to be detected is provided, and the output of the second far-infrared photoelectric element is compared with the output of the far-infrared photoelectric element, and SF ₆ gas at the output of the far-infrared photoelectric element is compared. The gas leakage visualization device according to claim 1, further comprising a correction device that corrects an output caused by a factor other than the gas leakage. In the measurement probe, pairs of the far-infrared filter and the far-infrared photoelectric element are arranged in a matrix, and the processing / display device displays a picture of each output of the far-infrared photoelectric element on the screen. 2. The gas leakage visualization apparatus according to claim 1, wherein the elements are arranged in a matrix.

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