JPS62213023A - Gas-filled switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a gas switch (the concept is also used to include a circuit breaker), and more specifically, the present invention relates to a gas switch (the concept is also used to include a circuit breaker). This invention relates to a gas switch whose arc-extinguishing performance is improved by attaching the gas switch.

<Prior Art> Conventionally, gas switches with various configurations have been provided in order to improve arc extinguishing performance.

FIG. 3 is a schematic diagram showing a conventional example of a gas switch that improves arc extinguishing performance by blowing gas. Child(
23) and surrounding the fixed contact (22) with a partitioning member (24), the fixed contact (22) side is used as a pressurizing chamber (25), and the movable contact (23) side is used as an exhaust chamber. It is configured as a chamber (26), and also has a partition member (24).
) is introduced into the pressurizing chamber (25). The upper half of the movable contactor (23) is formed into a cylindrical shape, and an exhaust port (27) for gas circulation is formed at a predetermined position in the cylindrical portion. SF6 gas as an arc-extinguishing gas is sealed inside the insulating container (21).

According to the gas switch having the above configuration, the pressure in the pressurizing chamber (25) is increased by the arc (28) generated between the fixed contact (22) and the movable contact (23) during the shutoff operation. Then, a gas flow (29) is generated from the pressurization chamber (25) through the exhaust port (27) toward the exhaust chamber (26), and the gas flow is sprayed onto the arc (28), thereby quickly expelling the arc (28). The arc can be extinguished.

<Problems to be Solved by the Invention> However, according to the above-mentioned switch, when the cutoff operation is completed and the pressure difference between the pressurization chamber (25) and the exhaust chamber (26) disappears, the flow of gas stops. Since there is almost no gas, it takes time to replace the degraded gas in the pressurizing chamber (25) with clean gas in the exhaust chamber (26). Moreover,
The degraded gas in the pressurization chamber (25) has a higher temperature than the clean gas in the exhaust chamber (26) and contains a large amount of decomposed components, so it has a lower specific gravity than the clean gas.
As a result of remaining in the upper part of the pressurizing chamber (25), the above gas replacement cannot be performed effectively.

For this reason, when the cutoff operation is repeated in a short period of time, clean gas cannot be sprayed against the arc.
There is a problem that the blocking performance gradually deteriorates.

Purpose This invention was made in view of the above-mentioned problems, and it is an object of the present invention to quickly and effectively replace the degraded gas in the pressurizing chamber with the clean gas in the exhaust chamber after the shutoff operation is completed. The purpose is to provide a gas switch that can

Means for Solving the Problems> In order to achieve the above object, the gas switch of the present invention has a gas switch installed in a predetermined upper part of the pressurizing chamber, with a
A ventilation opening having an opening area of 0 to 30% is formed.

According to the gas switch with the above configuration, after the shutoff operation is completed, the degraded gas remaining in the upper part of the pressurizing chamber is exhausted to the exhaust chamber side through the ventilation port in the upper part of the pressurizing chamber, and the movable contact Clean gas from the exhaust chamber can be introduced into the pressurizing chamber through the exhaust port.

Moreover, since the opening area of the ventilation port is set to 30% or less of the exhaust area, it is possible to prevent a large amount of gas from the pressurization chamber from flowing out from the ventilation port side and It is possible to cut off the arc while ensuring a sufficient gas flow to the arc and ensuring that the gas is sprayed against the arc.

<Example> Embodiments will be described in detail below with reference to the accompanying drawings showing embodiments.

FIG. 1 is a schematic diagram showing the main parts of a gas switch, and its basic configuration is the same as that of the conventional gas switch described above. In other words, an insulating container (
A fixed contact (12) is immovably mounted inside the insulating container (11), and a movable contact (13) is mounted hermetically through the center of the bottom plate of the insulating container (11). Further, the fixed contact (12) is provided by the partition member (14).
), and the fixed contact (12) side is placed in a pressurizing chamber (15).
The movable contactor (13) side is used as an exhaust chamber (16). The movable contactor (13) is introduced into the pressurizing chamber (15) through the bottom of the partitioning member (14).

Further, the movable contactor (13) has a cylindrical upper portion, and an exhaust port (17) for gas circulation at the lower portion of the cylindrical portion.

SF6 gas as an arc-extinguishing gas is sealed inside the insulating container (11).

In the gas switch having the above configuration, the upper part of the partitioning member (14) for configuring the pressurizing chamber (15) is provided with the pressurizing chamber (15).
5) and a ventilation opening (14a) that communicates with the exhaust chamber (16).
is formed. In the case of the figure, the ventilation ports (14a) are formed at a plurality of locations at predetermined intervals along the side wall of the partition member (14), and the total opening area of each ventilation port (14a) is determined by the movable contact. For the total exhaust area in (13),
It is set to be in the range of 10 to 30%.

With the above configuration, the deterioration after arc extinguishment remaining in the upper part of the pressurizing chamber (15) after the completion of the breaker operation in which the fixed contact (12) and the movable contact (13) are completely separated Gas can be exhausted to the exhaust port (17) side through the ventilation port (14a) at the top of the pressurization chamber (15) (see FIG. 2). At this time, due to the natural convection of the gas, the movable contact (
Clean gas from the exhaust chamber (16) side can be introduced into the pressurization chamber (15) through the exhaust port (17) of the pressurization chamber (13), allowing replacement of degraded gas with clean gas in the pressurization chamber (15). , it can be done quickly.

By the way, gas will flow out through the ventilation port (14a) even when the electric circuit is in operation, but the total opening area of each ventilation port (14a) is the same as that of the movable contact (13
) is set to be 30% or less of the total exhaust area of the exhaust ports (17), so the amount of gas flowing out can be smaller than the amount of gas flowing out from the exhaust ports (17). therefore,
Ensure sufficient gas flow to the exhaust port (17) side and avoid arcing (17).
8) can be reliably sprayed with gas. On the other hand, the total opening area of the ventilation ports (14a) is
Since 10% or more of the exhaust area of the movable contactor (13) is secured, it is possible to effectively replace the gas after the above-mentioned shutoff operation.

The gas switch of the present invention is not limited to the above-described embodiments, but includes, for example, forming a ventilation port (14a) in the ceiling of the partition member (14), and forming the number of ventilation ports (14a). Various design changes can be made without changing the gist of the present invention, such as increasing or decreasing as appropriate.

<Effects of the Invention> As described above, according to the gas switch of the present invention, after the shutoff operation is completed, the degraded gas in the pressurization chamber is quickly and effectively replaced with the clean gas in the exhaust chamber. Therefore, a unique effect is achieved in that stable arc-extinguishing performance can be exhibited even when the cut-off operation is repeatedly performed in a short period of time.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing a gas switch as an example of this light, Fig. 2 is a longitudinal cross-sectional view showing the completion of the shutoff operation, and Fig. 3 is a longitudinal cross-sectional view showing an example of a conventional gas switch. figure.

Claims (1)

[Claims] 1. Inside an insulating container filled with arc-extinguishing gas A pressurization chamber is provided in the pressurization chamber, and a fixed contact is installed in the pressurization chamber. In addition, there is an exhaust system for gas distribution. A movable contact with an air port is placed in the pressurization chamber. In the gas switch that has been introduced, the above A movable contactor is installed at a designated upper part of the pressurization chamber. Opening area of 10-30% of air area It is characterized by forming a ventilation hole with A gas switch with a characteristic.