JPS6025124A - Gas insulated 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] [Technical field of invention] The present invention relates to improvements in contact parts of gas insulated switches.

[Technical background of the invention and its problems]

Arc-resistant metal is attached to the tips of the fixed contact and the movable contact of a conventional gas insulated switch used in a container filled with an insulating gas in consideration of current switching.

However, with this structure, as the switching current increases, the arc generated increases, making it difficult to interrupt.

Increasing the opening/closing speed improves the opening/closing performance to some extent, but requires a large amount of energy for operation, and also increases the impact during opening/closing, which requires increasing the mechanical strength of each part.

Furthermore, the pressurizing spring of the fixed side contactor is overheated by the arc generated when the circuit is opened, resulting in a decrease in contact pressure and a deterioration in current carrying performance.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas-insulated switch that improves the switching performance of the switch, prevents overheating and burnout of the contact pressurizing spring, and maintains the initial current carrying performance.

[Summary of the invention]

In order to extinguish an arc generated between a fixed contact and a movable contact of a switch placed in a container filled with an insulating gas, the present invention is designed to move according to the movement of the movable contact. The method is characterized in that an insulator is provided, and the gas is blown onto the open electrode section by moving the insulator. or,
To provide a gas insulated switch characterized in that a ratchet mechanism is disengaged at a position where a movable contact has moved a certain distance and an insulator is disengaged, and the movement of this insulator causes the gas to be blown to an open electrode part.

[Embodiments of the invention]

An embodiment of the present invention will now be described with reference to the drawings.

First, the first invention will be explained. In Figure 1,
The basic configuration of a gas insulated switch will be explained.

A contact portion covered by shields 1 and 2 is attached to the top of a support insulator 4 fixed on pace 3. The movable contactor 5 is driven by an operating lever 6. Reference numeral 7 is a connector for connecting to an external circuit.

In FIGS. 2 and 3, electricity is supplied to the contact portion from the movable contact 5 through the fixed contact 11 and the contact base 12 to the terminal plate 7.

13 is a support for supporting the contact base 12, and 14 is a spring for applying contact pressure.

In the closed circuit state, the insulator 15 is pushed to the left by the movable contact 5, and the spring 16 for driving the insulator is compressed.

Next, when the circuit opening operation is performed, the movable contact 5 in FIG.
moves to the right, so the spring 16 drives the insulator 15 to the right, and the arc generated at the opening between the fixed contact 11 and the movable contact 5 is caused by the gas blowing as shown by the arrow. The arc is easily extinguished.

Note that 17 is a cylindrical cover for improving the effect of gas spraying.

Further, the hole 18 in the bottom of the contact base 12 and the hole 19 in the cover 17 are provided to prevent a space of self-negative pressure from being created when the insulator 15 is driven.

In addition, in the conventional structure without the insulator 15, the splash 14 is heated by the arc generated when the circuit is opened, but in the structure of the present invention, gas is blown onto the arc by the insulator 15, so the arc is heated outside the shield 1. Spring 1 is driven to
4 has no risk of being burned out.

Therefore, by providing a switch having the structure according to the present invention, the current switching performance can be increased and the spring for pressurizing the fixed contact can be prevented from burning out.

Next, the second invention will be explained. In FIG. 5, a hook-shaped fixed contact 21 similar to the shape of a hook is attached to a part of the radially arranged fixed contacts 11, and this hook-shaped fixed contact 21 cuts into a notched groove provided in an insulator 22. If the structure is such that the movable contact 5 is pulled out from the fixed contact 11 and the hook-shaped fixed contact 21, the hook-shaped fixed contact 21 will move clockwise with the force of the spring 14 about point P as the fulcrum. The hook-shaped movable contact 21 rotates with
The pawl 24 is removed from the insulator 22.

Just at this time, the movable contact 5 separates from the fixed contact 11 and the hook-shaped fixed contact 21, so an arc begins to occur, but the insulator 22 starts to be driven and gas is blown all at once, so the current switching performance is improved. improves.

Fig. 6 shows the ratchet mechanism section 25, which includes the hook-shaped fixed contact 21 (Fig. 7 (aHb)) and the pawl 24 (Fig. 8 (aHb)).
) (b) ), and the pawl 24 can rotate clockwise around the pin 26 by a certain angle. ``When the eye pawl 24 is pushed from the right, it rotates clockwise, but when it is pressed from the left, the stepped portion of the pawl 24 and the stepped portion of the hook-shaped fixed contact 210 engage with each other and do not rotate.

Therefore, in Fig. 6, when the circuit is closed from the open state, the pawl 24 rotates clockwise around the bottle 26, pushing the insulator, but when the circuit is opened from the closed state, the pawl does not rotate and the insulator is held back. Movable contact 5
After opening a certain distance, the insulator 22 can be activated.

As another example, in FIG. 3, there is a gap between the fixed contact 11 and the cover 17, so the gas blowing effect is weak, but as shown in FIG. If placed between them, the gap between the insulator 15 and the cover 17m becomes smaller and the effect of gas spraying can be further increased.

FIG. 10 shows the shape of another embodiment of the insulator 50.

In addition, as another embodiment, as shown in FIG.
If a groove Because the gap between them is small, it is slowly driven to the right. When the right end of the groove X of the insulator reaches the right end of the contact base 12, a large amount of gas flows in from the groove, and the insulator 15a is rapidly driven to the right, so that the blowing effect of the gas increases.

Further, as shown in FIG. 12, a groove Y is formed in a part of the contact base 12a.
If this is provided, when the right end of the insulator 15 reaches the left end of the groove Y, a large amount of gas will flow from the groove, so the insulator 15 will be driven rapidly and the effect of the gas spray can be increased.

Further, as shown in FIG. 13, even if grooves X are provided in the insulator 15a and grooves Y are provided in the contact base 12a, the insulator 15a can be rapidly driven, and the effect of gas blowing can be further increased. .

Furthermore, it is also effective to provide a large clearance between the insulator and the contact base.

〔Effect of the invention〕

According to the present invention, current switching performance can be improved by spraying insulating gas to the opening part by the movement of the insulator when opening the contact part of the gas insulated switch.

[Brief explanation of drawings]

FIG. 1 is a side view of the gas insulated switch of the present invention, FIG. 2 is a sectional view of the contact portion of FIG. 1 in a closed circuit state showing an embodiment of the first invention, and FIG. A-A cross-sectional view, the fourth factor is a cross-sectional view of the contact portion in FIG. 1 during opening, and FIG. 5 is a cross-sectional view of the contact portion in FIG. 1 in a closed circuit state showing an embodiment of the second invention. Figure 6 is a side view of the ratchet mechanism shown in Figure 5, and Figure 7 (a
) (b) is a partially cutaway side view and front view of the hook-shaped fixed contact in Figure 6, Figure 8 (al) (b) is a side view and front view of the claw in Figure 6. Figure 9 is the other side view. A cross-sectional view taken along the line A-A in FIG.
Figure 0 (at (b) is a side view of another embodiment of the insulator and J
The E view, FIG. 11, FIG. 12, and FIG. 13 are sectional views showing other embodiments of the fixed contact portion. 5... Movable contact 11... Fixed contact 15... Insulator 25... Ratchet mechanism (7317) Agent Patent attorney Kensuke Chika (1 idiot) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 (Q-) (S1 Figure 8 (b) Ql-2 Figure 9 Figure 10 (0-) (b)

Claims (2)

[Claims] (1) In a switch which is arranged in a container filled with an insulating gas and has a plurality of fixed contacts arranged radially divided around the outer periphery of the movable contact, which are attached to a contact base, the movable contact An insulator is provided that faces the child and moves in accordance with the movement of the movable contact, and when the fixed contact and the movable contact are opened, the movement of the insulator causes the gas to be discharged. A gas insulated switch that sprays air onto the opening section. (2) In the opening/closing Li&C, which is arranged in a container filled with an insulating gas and has a plurality of fixed contacts arranged radially divided around the outer periphery of the movable contact, which are attached to a contact base, the movable An insulator is placed facing the contact, and when the movable contact moves a certain distance in the opening direction, the ratchet mechanism is released, and from that point on, the insulator moves, and the movement of the insulator causes the gas to be released. A gas insulated switch that sprays air onto the opening section.