JPH0222541A - Water detection sensor - Google Patents

Abstract

PURPOSE:To fit even the high voltage part of equipment and to detect whether or not dew condensation is caused at this part by providing a comparing device which compares an optical fiber having a gap with the quantity of light. CONSTITUTION:When the ambient temperature falls while the moisture concentration in the insulated electric equipment(GIS) 1 is raised to cause dew condensation on an insulating spacer 3, circumferential condensed water enters the gap by capillarity. Consequently, the ratio of the quantity of light inputted to an optical fiber 14 and the quantity of output light passed through the gap varies from the initial state wherein the gap is filled with insulating gas 4. For the purpose, this ratio value is measured by the comparing device 17 at all times to detect when the dew condensation is caused. Then the sensor 13 is constituted having sufficiently small heat capacity, so the sensor 13 can follow up the temperature variation of the spacer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a moisture detection sensor, and is particularly suitable for detecting moisture attached to high voltage equipment.

[Conventional technology]

FIG. 6 shows, for example, the Mitsubishi Electric branch shaft VOL, 56. N.

2.1982. A concept showing a case where the conventional moisture detection sensor shown in P, 23 to F, 26 is used to detect moisture attached to an insulating spacer part in a gas insulated electrical device (hereinafter referred to as GI8), which is a high voltage device. In the figure, (1) is G engineering S, high voltage conductor (2), conductor (
2) supporting insulating spacer (3), insulating gas (4)
, a container (5) filled with an insulating gas (4). (
6) is a part of a sensor installed on the inner wall of the container (5) to detect moisture in the container (5), and is composed of a main body part (7) and a part of a heater (8). Each of these is Google (9), α
It is connected to the measuring section (6) via Q. (2) is a layer-sealed terminal attached to the container (5), through which the goople (9) and σQ penetrate.

The conventional moisture detection sensor is configured as described above, and when detecting moisture in the container (5), in order to increase the detection sensitivity of the main body (7), the heater part (8) is first energized for a short period of time. to heat the main body (7). Thereafter, the electrical characteristics of the main body (7) are measured by the measuring section αη, and the relative humidity value corresponding to the obtained electrical characteristics is determined. Based on the height of this value, it is estimated whether or not there is dew condensation on the insulating spacer (3) portion.

[Problem to be solved by the invention]

In the conventional moisture detection sensor as described above, since the sensor part (6) and the groups (9) and (g) are conductors, they cannot be mounted directly on the insulating spacer (3) of the high voltage part. There was a problem in that it was not possible to directly detect the presence or absence of dew condensation at a location.

The present invention has been made to solve this problem, and an object of the present invention is to provide a moisture detection sensor that can be attached to a high-voltage section of equipment and can directly detect the presence or absence of dew condensation at this location.

[Means to solve the problem]

The moisture detection sensor according to the present invention includes an optical fiber having a slit and a comparison device that compares the amount of light.

[For production]

In this invention, moisture enters the slit, and a comparison device compares the amount of light input to the optical 7 eyer and the amount of output light that has passed through the slit.

[Embodiment] Fig. 1 is a conceptual diagram showing an embodiment of a moisture detection sensor according to the present invention, which detects moisture attached to an insulating spacer part in a gas-insulated electric machine (hereinafter referred to as 0-S). Indicate the case. In the figure, from G (1), high voltage conductor (2
), insulating spacer (3), insulating gas (4), container (5
), the sealed terminal CL15 is the same as the conventional one. (2
) is a part of the sensor that is installed on the insulating spacer (3) and detects the presence or absence of dew condensation at this location, as shown in Figure 2 (4).
, CB) As shown in the enlarged view (side view of (A)), the flat end surface of the electrically insulating optical 7-eyeper α-fathom is thin 1i
1 (G). (2) is a thin, insulating mounting base that supports these on an insulating spacer (3). 0α is a comparison device connected to optical fiber α4, and the amount of light input to Optical 7 Eyeper α→ and the above slit (to)
Compare the amount of output light that has passed through. Further, the optical fiber α♦ is guided into the container (5) through the sealed terminal (2).

In the moisture detection sensor configured as above,
If the ambient temperature suddenly drops and dew condenses on the insulating spacer (3) when the moisture concentration in Gzs (1) is high, capillary action will cause condensed moisture from the surrounding area to flow into the insulating spacer (3). Infiltrate. Therefore, the value of the ratio of the amount of light input to the optical fiber α◆ and the amount of output light that has passed through the slit (to) is the slit (2).
◇ Therefore, by constantly measuring the value of the above ratio using a comparator, it is possible to detect when condensation has occurred. . Note that since the heat capacity of the sensor part (2) is configured to be sufficiently small, the sensor part (2) can follow the temperature change of the insulating spacer (3) part.

In the above embodiment, a case was shown in which a narrow gap was formed between the flat end faces of the original fiber α◆, but as shown in the enlarged view of part (2) of the sensor in FIG. 1
A slit (15 mm) may be formed by facing the end surfaces of 4A) into a ground glass shape. In this case, the above-mentioned capillary phenomenon can be further expected.

FIG. 4 is an enlarged view of a part (2) of the sensor showing still another embodiment, and shows the gap between the flat end surface of the optical fiber 04 installed on the flaky mounting base and the mirror. slit (1
5B), and a conceptual diagram of the entire moisture detection sensor in this case is shown in FIG. In Fig. 5, (1"/A) is the light output part, (1B) is the light input part, (6) is the half mirror, and 0αη is the input source amount to the optical fiber α→ and the above-mentioned slit. This is a comparison device that compares the amount of output light that has passed through (15B).In this case, a single beam of light passes through the sealed terminal (2)
This makes it easier to seal the gas (4).

〔Effect of the invention〕

As explained above, the moisture detection sensor according to the present invention includes an optical fiber having a slit that allows moisture to enter, and a comparison device that compares the amount of light input to the original fiber and the amount of light output after passing through the slit. Since a part of the sensor is made of an insulating material, it has the advantage that it can be attached to high voltage parts of equipment.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing one embodiment of the moisture detection sensor according to the present invention. FIG. 1gg is an enlarged view of a part of the sensor, FIG. 3 is an enlarged view of a part of the sensor showing another embodiment, and FIG. FIG. 5 is an enlarged view of a part of the sensor showing another embodiment, and FIG. 5 is a conceptual diagram showing the entire moisture detection sensor of FIG. In the figure, @ is a part of the sensor, (b) is an optical fiber,
(G) is a slit, and αη is a comparison device. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] A moisture detection sensor comprising: an optical fiber having a slit that allows moisture to enter; and a comparison device that compares the amount of light input to the optical fiber and the amount of light output after passing through the slit.