JPS6025575Y2 - Condensation detection device for electrical equipment containers - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device that detects in advance the occurrence of dew condensation inside a container for electrical equipment.

When the outside temperature drops, condensation may form on the inner surface of the walls of electrical equipment storage containers such as gas-insulated switchgear containers, operation boxes containing link mechanisms, and switchboard containers. be.

Condensation inside electrical equipment storage containers can cause accidents, so
Conventionally, it is necessary to ensure that there is no condensation inside the container.

For this reason, condensation was prevented by sealing the container and constantly heating the inside of the container with a heater, but this method requires electricity to be applied to the heater even when no condensation occurs, so there is a drawback that electricity is wasted. there were.

In order to avoid such waste, measures should be taken such as energizing the heater only when there is a risk of condensation forming inside the container, or stopping operation when there is a risk of condensation forming. However, in the past, this method could not be used because there was no suitable device to detect dew condensation in advance.

``An object of the present invention is to provide a dew condensation detection device for an electrical equipment container that can detect in advance the occurrence of dew condensation inside the electrical equipment container.

The present invention will be explained in detail below with reference to the illustrated embodiments.

FIG. 1 shows a first embodiment of the present invention, in which reference numeral 1 denotes a container such as a storage box for electrical equipment in which dew condensation needs to be detected.

The container 1 is made of iron, for example, and has a closed structure.

2 is a dew condensation detection device according to the present invention, which includes a temperature sensing thermal conductor 3 disposed outside the container 1;
a heat conductor 4 for detecting dew condensation disposed inside the container 1; , and humidity sensing means 6 provided in close contact with the thermal conductor 4 for sensing dew condensation.

The heat conductors 3 and 4 and the heat transfer member 5 are made of a metal having better thermal conductivity than the wall of the container 1, for example, Cu.

The temperature sensing thermal conductor 3 is formed into a flat plate having a sufficiently large area, and the dew condensation sensing thermal conductor 4 is formed into a flat plate having a smaller area than the thermal conductor 3'.

The heat transfer member 5 is formed into a rod shape and is attached to the heat transfer member 5 by passing through the inside of a ring-shaped spacer 7 attached to the inner surface of a through hole 1b provided in the wall portion 1a.

The spacer 7 is made of a material having a lower thermal conductivity than the container 1, and the spacer makes the thermal resistance between the heat transfer member 5 and the container 1 sufficiently large.

The humidity detection means 6 is an element that converts humidity into an amount of electricity, and as such an element, for example, an element in which humidity correlates with resistance or actance can be used.

Elements that have a correlation between humidity and electrical resistance include:
For example, a metal oxide fine powder thin film sensor can be used.

The humidity detection means 6 has a conductor 8 for extracting its detection signal.
and Q are connected, and these conductive wires are led out to the outside through a bushing 10 that is attached to the wall 1c of the container 1.

Conductive wires 8 and 9 led out of the container 1 are connected to the amplifier 1, for example.
1, and the detection signal amplified by the amplifier 11 serves as a signal to start energizing a heater (not shown) in the container 1, a signal to stop the operation of equipment in the container 1, or a lamp. It is used as a signal to activate warning means such as a buzzer or a buzzer.

In order to keep the inside of the container 1 airtight, there are gaps between the spacer 7 and the through hole 1b of the wall 1a of the container 1, and between the spacer 7 and the heat transfer member 5.
Seal means such as O-rings are arranged between the bushings FO and the through-hole of the bushing FO.

With the above configuration, the temperature sensing thermal conductor placed outside the container has a larger surface area than the dew condensation sensing thermal conductor placed inside the container, and both thermal conductors Since the thermal resistance between the heat transfer member that connects both the heat conductors and the container is large, when the temperature decreases, the temperature increases before this change in outside temperature is transmitted to the inside through the wall of the container 1. It is transmitted from the sensing thermal conductor 3 to the dew condensation sensing thermal conductor 4 and the humidity detection means 6 through the heat transfer member 5.

Therefore, when the outside temperature falls below the dew point, condensation occurs on the humidity detection means 6 before dew condenses on the inner surface of the wall of the container 1, and a detection signal is obtained from the amplifier 11.

Using this signal, it is possible to perform advance management of condensation and take necessary precautions to ensure equipment safety.

FIG. 2 shows a second embodiment of the present invention. In this embodiment, the heat conductive member 4 for detecting dew condensation is formed in a cylindrical shape, and the humidity detecting means 6 is closely attached inside the member. ing.

The other configurations are the same as those in FIG. 1.

The embodiment shown in FIG. 2 is suitable when it is not possible to obtain a humidity sensing means in the form of a thin film.

Fig. 3 shows a third embodiment of the present invention, which is a case in which a part of the pressure detection device is also used as a dew condensation detection device when a pressure detection device is installed, such as in a gas-insulated switchgear. be.

That is, in FIG. 3, reference numeral 12 is an iron container formed in a cylindrical shape, the end of which is hermetically closed with a lid 13.

The heat transfer member 5 is provided by airtightly passing through a spacer 7 attached to the lid 13, and both ends thereof are connected to the temperature sensing thermal conductor 3 and the dew condensation sensing thermal conductor 4. .

A humidity detection means 6 is attached to the thermal conductor 4 for detecting dew condensation, and conductive wires 8' and 9 drawn out from this detection means are connected to the container 1.
2 through a bushing 10' that hermetically passes through the bushing 10'.

In this case, the spacer 7-' is formed of an electrical insulator, and the entire dew condensation detection device 2 is insulated from the container 12.

It extends to the vicinity of the thermal conductor 4 for sensing dew condensation.

A spherical electrode 15 is provided at the end of the conductor 14, and the potential of the conductor 14 is detected through the capacitance between the electrode 15 and the conductor 4.

A terminal 16 is attached to the end of the temperature sensing thermal conductor 3, and this terminal is connected to an amplifier 18 via a voltage detection line 17.

In the above explanation, it is assumed that the container is made of metal, but
The present invention can also be applied when a container other than metal is used, such as a concrete cubicle.

As described above, according to the present invention, a thermal conductor for temperature sensing and a thermal conductor for dew condensation sensing are arranged on the outside and inside of a container for electrical equipment, respectively, at a distance from the wall of the container, and both thermal conductors By interposing a spacer with a higher thermal resistance than the container between the heat transfer member that connects the components and the wall of the container,
Both heat conductive members and the heat conductive member are thermally separated from the container, and the surface area of the heat conductor for temperature sensing is made sufficiently larger than the surface area of the heat conductor for dew condensation sensing, so that the temperature outside the container is maintained by the heat conductor for dew condensation sensing. Since the sensor is designed to be sensitive to the body, it is possible to detect when condensation is forming inside the container of an electrical device before the condensation actually forms on the inner surface of the container.

Therefore, it is possible to control dew condensation in advance, and there is an advantage that countermeasures against dew condensation can be taken quickly and accurately.

[Brief explanation of drawings]

1 to 3 are schematic sectional views showing different embodiments of the present invention. 1... Container, 2... Condensation detection device, 3
...Thermal conductor for temperature sensing, 4...Thermal conductor for dew condensation sensing, 6...Humidity detection means.

Claims (1)

[Claims for Utility Model Registration] A heat transfer member provided by penetrating the wall of a container of an electrical device via a spacer, and a heat transfer member disposed outside the container apart from the wall of the container. a temperature sensing thermal conductor thermally coupled to an end of the heat transfer member located externally;
a dew condensation sensing thermal conductor disposed inside the container away from the wall of the container and thermally coupled to an end of the heat transfer member located inside the container; a humidity sensing means attached in close contact with the heat conductor], the temperature sensing heat conductor has a surface area sufficiently larger than the dew condensation sensing heat conductor, and the spacer is attached to the container. The heat transfer member, the temperature sensing thermal conductor, and the dew condensation sensing thermal conductor are made of a material having a higher thermal conductivity than the wall. Features a dew condensation detection device for electrical equipment containers.・