JPS588089B2 - load switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a main blade swing prevention device for a load switch in which an arc contactor and a main contactor are not shared, and a part of the main blade is a movable main contactor.

In a load switch that does not share an arc contactor and a main contactor, when turning on as shown in FIG. When the movable main contact 17 contacts the fixed main contact 16 and pulls out, the movable main contact 17 first contacts the fixed main contact 16.
The movable arc contact 12 then separates from the fixed arc contact 14.

Therefore, an arc is always generated between the movable arc contact 12 and the fixed arc contact 14 when the current is switched on and off.

When applying a short-circuit current using a multi-phase simultaneous operation load switch with the above structure, the movable arc contact 12
An arc is generated between the upper terminal 15, the fixed arc contact 14, the movable arc contact 12, the arc blade 10, the main blade 18, and the fixed arc contact 14.
Flows through the hinge contact 8 - the lower terminal 6 .

The electromagnetic force generated by this current causes the main blades 18 of each phase to attract or repel each other, causing the main blades 18 to oscillate.

When the main blade 18 swings, it causes the movable main contact 17 to swing, making it impossible for the fixed main contact 16 and the movable main contact 17 to make smooth contact, making it impossible to make the connection, or even if it is made, the fixed main contact 16 and the movable main contact Welding may occur between contacts 17, making it impossible to trip.

An object of the present invention is to provide a device that reliably prevents deflection of the main blade due to electromagnetic force without increasing the strength of the main blade or increasing the distance between each phase, without causing problems in terms of cost and space. be.

The present invention prevents the main blade from wobbling by providing a guide plate that prevents the main blade from wobbling due to electromagnetic force and regulates the direction of movement of the main blade. Features.

The present invention will be described below with reference to embodiments shown in the drawings.

In Figures 1 to 3, 1 is a frame for attaching the mechanism part 2 and breaker part 3 of the load switch, and 4 is an insulator that supports an upper terminal 15 and a lower terminal 6, which are fixed to the frame 1. .

A fixed main contact 16 is fixed to the upper terminal 15, and a main blade 18 is rotatably pivotally connected to a hinge contact 8 fixed to the lower terminal 6 by a pin 7.

1T is a movable main contact that is part of the main blade 18 and comes into contact with the fixed main contact 16.

Reference numeral 10 denotes an arc blade fixed to a main blade 18 with bolts 9, and a movable arc contactor 12 is formed at the tip thereof.

Reference numeral 14 denotes a fixed arc contact fixed to an upper terminal 15 which is provided so as to be able to come into contact with and separate from the movable arc contact 12. Reference numeral 13 indicates an arc that occurs when the movable arc contact 12 and the fixed arc contact 14 are separated. This is an arc extinguishing chamber for assisted arc extinguishing.

Reference numeral 4 denotes an insulating operating rod for mechanically connecting the mechanism section 2 and the breaker section 3 and electrically insulating them.

The above configuration is the same as the conventional one, but in this embodiment, in order to prevent the main blade 18 from swinging due to electromagnetic force when current is turned on, the fixed main contact 16 is made of insulating material as shown in the figure. The made guide plate 11 for preventing vibration of the main blade was attached.

The guide plate 11 for preventing vibration of the main blade has a size that can restrict the movement of the main blade 18 before an arc is generated between the fixed arc contact 14 and the movable arc contact 13 and arc current flows when the main blade is turned on. In addition, the movable main contact 17 and the fixed main contact 16 are made to have a size that does not interfere with their contact.

In addition, it must be installed using a material that will not be deformed by electromagnetic force.
It is fixed to prevent rattling.

If there is no guide plate 11 to prevent main blade deflection, an arc will occur between the fixed arc contact 14 and the movable arc contact 12 when the main blade is turned on, and the arc current will flow from the upper terminal 15 to the fixed arc contact 14 to the movable arc. Contactor 12 - Arc blade 10 - Main blade 18 - Hinge contactor 8 - Lower terminal 6
flows.

The electromagnetic force generated by this current causes the main blades 18 of each phase to attract or repel each other, causing the main blades 18 to oscillate.

However, if the guide plate 11 for preventing the main blade from swinging is provided as in this embodiment, an arc will occur between the fixed arc contact 14 and the movable arc contact 12 when the main blade is turned on, and the electromagnetic force due to the arc current will be applied to the main blade. 18, there is a small gap between the main blade and the other end of the guide plate 11, and the swing of the main blade is regulated by the wide other end of the guide plate 11, so the main blade 18 does not deflect. The movable main contactor 17 and the fixed main contactor 16 can be brought into contact smoothly and reliably.

Furthermore, the width dimension of one end of the guide plate 11 is the same as that of the fixed main contactor 16.
By forming the movable main contact 17 to be narrower than the width dimension, the movable main contact 17 can be reliably brought into contact with the fixed main contact 16.

This means that if the width of one end is wider than the width of the fixed main contact, the movable main contact will come into contact with the one end, resulting in no electrical conduction, but in the present invention, the shape is limited to Therefore, there is no possibility of non-conduction.

As described above, according to the present invention, the guide plate can prevent the main blade from swinging due to electromagnetic force when the movable arc contactor is inserted into the fixed arc contactor.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a load switch shown as an embodiment of the present invention, and FIGS. 2 and 3 are sectional views of essential parts of FIG. 1. Explanation of symbols, 10... Arc blade, 11... Guide plate for preventing main blade deflection, 12... Movable arc contactor,
13... Arc extinguishing chamber, 14... Fixed arc contactor, 16...
Fixed main contact, 17... Movable main contact, 18... Main blade.

Claims (1)

[Claims] 1. Correspond to each other through space! a pair of supporting insulators, a terminal provided on the supporting insulator, a fixed contact and a fixed arc contact provided on one terminal and protruding from the terminal, and a hinge contact provided on the other terminal. The movable contact supported via the support pin, the movable arc contact provided on the movable contact, and the movable contact and the movable arc contact as the movable contact rotates via the support pin. an operating mechanism unit that electrically connects and separates a fixed contact and a fixed arc contact, one end of which is supported by the fixed contact and which has a width wider than the width of the fixed contact. A load switch characterized in that a guide plate made of an insulating member, which is wider than the width of the fixed contact and guides the moving contact in and out, is provided at the other end opposite to the one end.