JPS5916686B2 - Puff-a-type gas shield disconnector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a buffer type gas breaker that extinguishes an arc by injecting gas when the circuit is shut off.

The conventional buffer type gas breaker is as shown in Figure 1.
The insulating support 2 that supports the fixed contact 7 and is fixed to the containers 1 and 5 is injected from the injection hole 8C when the movable contact 8 and the fixed contact 1 are separated, and the fixed contact 7 and 8 Hot gas is blown in contact with the arc between the two.

For this reason, the dielectric strength of the insulating support made of cast resin decreases, so it is necessary to increase the creepage insulation distance between the fixed contact and the container, which has the drawback of making it difficult to downsize the device.

This invention was made to solve the above-mentioned drawbacks.
By blocking the insulating part that is in contact with the container of the insulating support that supported one contact with the blocking part that protrudes from the guiding part that guides the gas, the dielectric strength of the insulating part is prevented from decreasing. The object of the present invention is to provide a buffer type gas breaker that can be made smaller.

The figures will be explained below.

In Fig. 2, 1 is a cylindrical metal container filled with an arc-extinguishing gas such as sulfur hexafluoride (SF6), and 2 is a cylindrical metal container whose one end is in contact with the container 1 through a packing 3 and has a predetermined creeping insulation. It is a cylindrical insulating support body having an insulating part 2a and an arm part 2b having a distance, and the inner surface constitutes a guiding part 2C that guides gas injected from an injection hole 8c, which will be described later, and the insulating part 2
A shielding portion 2 adjacent to a and protruding from the guiding portion 2C.
It has d.

Reference numeral 4 denotes an outlet terminal, and one end having a through hole 4a closes the inside of the support body 2, and the other end is configured to be exposed from the arm portion 2b.

Reference numeral 5 denotes a metal container which is in contact with the other end of the support 2 through a packing 6 and is fixed to the container 1, forming a chamber 5a.

Reference numeral 7 denotes a fixed contact that passes through the through hole 4a and has one end fixed to the support 2 via the outlet terminal 4 and is electrically connected to the outlet terminal 4. has.

A movable contact 8 has a plurality of through holes 8a and an arc contact portion 8b, and the arc contact portion 8b constitutes an injection hole 8c, which can be brought into contact with and separated from the fixed contact 7.

The shielding section 2d is arranged on a virtual line connecting the injection hole 8c and the insulating section 2a.

9 is a buffer cylinder fixed to the movable contact 8 and having a plurality of through holes 9a communicating with the through hole 8a;
and is movable by a drive mechanism (not shown).

A piston 10 is slidable on the inner surface of the cylinder 9, is fixed to a fixed part (not shown), and cooperates with the cylinder 9 to form a chamber 11.

Next, the operation will be explained.

In FIG. 2, when the space between the liquid contactors 1 and 8 is closed as shown, when the cylinder 9 is moved downward, the SF6 gas in the chamber 11 is compressed and the solid contactor 7°8 The gap is opened and an arc is generated.

Then, the compressed gas in the chamber 11 flows through the through holes 8a and 9a.
is injected into the arc through the arc, and the arc is extinguished.

At this time, the gas is injected into the chamber 5a through the through hole 7a and flows along the guide portion 2c.

Therefore, the gas that has become hot due to contact with the arc is confined by the shield portion 2d, and can be prevented from being blown directly onto the insulating portion 2a.

According to this invention, the insulating part that is in contact with the container of the insulating support supporting one of the contacts is shielded from the injection hole by the shielding part protruding from the guiding part that guides the gas. This prevents high-temperature gas from being blown directly onto the insulating parts and maintains the dielectric strength of the insulating parts in a good condition, making it possible to keep the creepage insulation distance to the minimum necessary and thus downsizing the equipment. is possible.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional buffer type gas breaker, Figure 2
The figure is a sectional view showing an embodiment of the present invention. In the figure, 1.5 is a metal container, 2 is an insulating support, 2a
2c is an insulating part, 2c is a guiding part, 2d is a shield part, 7 is a fixed contact, 8 is a movable contact, and 8c is an injection hole. Note that the same reference numerals in each figure indicate gaps or corresponding parts, respectively.

Claims (1)

[Claims] 1 Supporting a fixed contact among a pair of contactors that can be moved and separated housed in a metal container, and equipped with an insulating support that is fixed to the container, and when the solid contacts are separated, the gas is released. The support body has an insulating part that is in contact with the container and has a predetermined creepage insulation distance, and an insulating part that is opened opposite to the injection hole to guide the flow of the gas. It is composed of a guiding part and a shielding part adjacent to the insulating part and protruding from the guiding part on a virtual line connecting the injection hole and the insulating part so as to shield the insulating part. A buffer type gas breaker featuring: