JPS6039172B2 - Failure detection device for electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a failure detection device for electrical equipment, and more particularly to a thin failure detection device for electrical equipment that is applied to equipment having a high voltage circuit housed in a closed container.

Generally, when a failure occurs in an electrical device, decomposition gas is generated. Therefore, commercially available gas detection tubes can be used as a failure detection device.

However, such detection tubes mainly target low concentration areas and respond to only one target substance, so the decomposition gas products generated in electrical equipment are complex and change over time. There were doubts as to whether adequate measurement detection would be performed in such cases. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a new failure detection device for electrical equipment that can reliably detect failures in electrical equipment.

More specifically, the present invention focuses on the fact that most of the gas generated when a failure occurs in electrical equipment is acidic gas, and detects the presence or absence of equipment failure by detecting acidic gas. An object of the present invention is to provide a failure detection device for electrical equipment that is configured to detect. That is, the present invention provides an electrical device in which an insulating gas is pressurized and the gas is drawn out from a part of this device.
Failure detection of electrical equipment by passing a reagent that changes color in response to decomposed gas components in the insulating gas or by-product gas components of these decomposed gas components to a detection element that is housed in a transparent container that can be observed from the outside. In the apparatus, the sensitivity of the detection element is adjusted by the amount of alkaline aqueous solution added to the activated alumina for chromatography carrying the reagent, and the pH element is sensitive to the decomposed gas component or a by-product gas component of the decomposed gas component as the reagent. The present invention provides a failure detection device for electrical equipment, characterized in that it retains promocresol purple, which is an indicator. Hereinafter, the present invention will be explained in more detail with reference to the drawings.

Figure 1 is a schematic configuration diagram of an electrical device to which a failure detection device according to the present invention is applied, and 1 in the figure is an S
An electrical device filled with F6 gas, 2 a piping path for taking out the gas in the electrical device 1, 3 a stop valve for sealing SF6 gas in the electrical device 1, and 4 a piping path 2
5 is a failure detection device according to the present invention, and 6 is a flow meter for measuring the flow rate of the gas flowing in the piping path 2.

The following describes the principle of applying the failure detection device for electrical equipment having the configuration described above to SF6 gas equipment.

When a discharge occurs between the traverse of the high voltage conductor, between the surface of the insulator and the high voltage conductor, or between the high voltage conductor, SF6 gas decomposes and low fluorinated sulfur compounds such as SF4 gas are generated.

These low-fluorinated sulfur compounds are chemically unstable and react with water present in the SF6 gas or materials constituting the equipment, producing acidic gases such as HF, S02, and SiF4. When a discharge occurs on or near the surface of an insulator, not only SF6 gas is decomposed, but also carbon and oxygen gases in the insulator or other equipment materials are decomposed and released, producing CO2 (carbon dioxide gas). do.

Among the acid gases generated, SF4, HF, and SIF4 are chemically unstable.

For this reason, while it is consumed by reaction with the components inside the equipment, it is also well adsorbed into the adsorbent placed inside the equipment for the purpose of absorbing moisture and adsorbing decomposed gases.
Concentration decreases relatively quickly. S02 and C02 are chemically stable substances, and the effect of the adsorbent is relatively slow. FIG. 2 is a schematic configuration diagram showing the detailed configuration of a failure detection device according to an embodiment of the present invention applied to the configuration shown in FIG. A detection element, 51 indicates an outer box made of transparent acrylic resin to enable observation of changes in the detection element 52, and 53 indicates a connecting pipe for connecting the failure detection device 5 and the piping line 2. It is something.

Incidentally, figure a shows a side view of the failure detection device 5, and figure b shows a front view as seen from the direction of arrow X. Third
The figure is a partial schematic configuration diagram showing the detailed configuration of the second illustrated detection element 52, in which 521 is a glass tube, and 523 is an activated alumina for chromatography 522 sealed in the glass tube 521 and adsorbing promocresol purple. Each figure shows cotton for supporting the activated alumina 523.

Focusing on the movement of gas components, if the current at the time of failure is relatively large, a considerable amount of SF4, HF, and other gas components remain even after time passes. However, if the fault current is very small and occurs continuously, most of SF4, HF, and SiF4 may disappear during the process, leaving only S02 and C02. Therefore, it is desirable to respond to all these acid gases in order to detect the presence of a fault. Therefore, as shown in Figures 1, 2, and 3, the gas sealed in the electrical equipment 1 is led out through the piping 2 and used as the gas to be measured. It passes through a detection element 52 sealed in a glass tube 521.

In addition, in order to have quantitative property here, the gas flow rate may be controlled by the flow rate adjustment valve 4. The particles of activated alumina 523 are small, and if the gas passing through them is acidic, they will react sufficiently and change color from purple to yellow. Therefore, the failure detection device 5
The state of discoloration of the detection element 52 inside the acrylic outer box 51
It is possible to know that a failure has occurred in the electrical equipment 1 by observing the electrical equipment 1. Note that the third illustrated detection device 52 is created by the following method. Indicator solution promocresol purple solution (promocresol purple 0.5 to 10 ethyl alcohol (95 vol%)
) Add water to 90' to make the total volume 100') 3'
Activated alumina (neutral) 30 to 0. state NaOH solution 1
Add the above from step 5 and mix. Rope azusa until the particles become easily sticky and uniformly colored. This activated alumina is dried by flowing dry nitrogen gas while keeping it at around room temperature. Dried activated alumina particles 523 are densely packed into the glass tube 521. Note that both ends of the glass tube 521 are supported with cotton 522 for the purpose of buffering and holding. It is preferable that the detection element 52 that is not used is usually covered with a plastic cap to cut off contact with the outside air. Regarding the response of the detection element, when the water content was controlled to 1%, several types of S
The response to the F4 density, ie, the length of the color change area, is as shown in FIG.

Here, neutral activated alumina was used.

Activated alumina can be industrially obtained in basic, neutral, and acidic forms using its manufacturing method. To detect acidic gases like this detection element, it is limited to basic or neutral gases. Furthermore, since the response (color change) of the sensing element is mainly controlled by the basicity, using neutral activated alumina, which makes it easy to control the amount of alkali, it is possible to easily adjust the detection concentration over a wide range by changing the alkaline solution (concentration). can be controlled. In addition, since the color change of promocresol purple is close to that of complementary colors, it is easy to determine the presence or absence of color change, making it ideal as a pH indicator to be used.

As described above, according to the present invention, it is more effective in detecting faults such as partial discharges that occur continuously, rather than just immediately after an accident occurs, and it is possible to detect faults that are different from electrical or mechanical detection methods. Since this is the principle, it can be used in conjunction with this, and it is also possible to detect an inexpensive failure detection device for electrical equipment that generates acidic gases, such as N02 generated during partial discharge in electrical equipment that uses air as an insulating medium. It is something that can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an electrical device to which a failure detection device according to the present invention is applied, and FIG. 2 is a detailed configuration diagram of a failure detection device according to an embodiment of the present invention applied to the configuration shown in FIG. FIG. 3 is a partial schematic diagram showing the detailed configuration of the detection element shown in the second diagram, and FIG. 4 is a graph for explaining the response of the detection element. Throughout each figure, the same reference numerals indicate the same or equivalent parts, 2 is a piping path, 5 is a failure detection device, 52 is a detection element, and 523 is activated alumina for chromatography. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 An electrical device in which an insulating gas is sealed under pressure, the gas is drawn out from a part of this device, and the decomposed gas components in the insulating gas or the by-products of these decomposed gas components are placed in a transparent container that can be observed from the outside. A failure detection device for electrical equipment in which a reagent that changes color in response to generated gas components is passed through a detection element containing a reagent, in which the sensitivity of the detection element is adjusted by adding an alkaline aqueous solution to activated alumina carrying the reagent, and 1. A failure detection device for electrical equipment, characterized in that it supports as a reagent promocresol purple, which is a pH indicator that is sensitive to the decomposed gas component or a by-product gas component of the decomposed gas component.