JPS5921138B2 - Circuit breaker switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application) The present invention relates to a switching device in which when an overcurrent such as a short circuit current or an overload current flows, an electromagnetic plunger performs a suction operation to pull a movable contact plate off.

(Problems with conventional technology) As this type of breaker device, the one shown in FIG. 4 exists.

That is, the plunger insertion hole A is provided in the movable contact plate opening, and the movable contact C provided in the movable contact plate opening is joined to the fixed contact E of the plate 2.

Current is passed in opposite directions through both contact plate openings 2, and the electromagnetic force in the opposite direction generates a repulsive force upon separation, thereby improving the breaking performance.

Now, because of the aforementioned plunger insertion hole A, the current draws an arc along the hole A in the vicinity thereof, so the straight line of the fixed contact plate 2 does not match the direction of the electromagnetic force, resulting in a loss.

(Objective) The present invention has been made in view of the above-mentioned points. Namely, when the granger is turned on, the insertion hole of the granger is closed with an elastic conductive plate fixed to the movable contact plate, and a current is generated. The object is to pass linearly through the movable contact plate so that the electromagnetic force matches that of the fixed contact plate, thereby preventing loss of repulsion force.

(Example) The present invention will be described below as an example based on the drawings. 1 is a breaker main body, 2 is a manually operated bundle, 3 is a bundle drive unit, 4 is a plunger type electromagnet, and plunger 5. It consists of 6 coils.

Then, when an overcurrent flows through this plunger type electromagnet 4,
A magnetic flux is generated in the coil 6, which attracts the plunger 5 and disturbs the bundle drive unit 3 (D).

A movable contact plate 7 is linked to the bundle drive unit 3 and has a hole 8 through which the plunger 5 is inserted.

This hole 8 has a large hole 8a through which the wide head 5a of the plunger 5 passes, and a hole 8b that is lowered to prevent it from coming out. A recess 8c is formed in which the head 5a is hidden.

Therefore, the movable contact plate 7 performs manual on/off operations independently of the plunger 5, and is separated by the plunger 5 in the event of an overcurrent.

Reference numeral 9 denotes an elastic conductive plate that closes the hole 8 by positioning the wide head 5a of the plunger 5 in the recess 8c, and has a base end 9a fixed to the contact plate 7.

10 is a movable contact, and 11 is a fixed contact plate, which is parallel to the movable contact plate 7, and the current directions of both are opposite to each other.

(Operation explanation) Next, to explain the opening/closing operation of the breaker of the present invention, first, the second
In the figure (A), both contacts 10 and 12 are connected, and the current flows in the direction of the arrow and is in the opposite direction.

In this case, the hole 8 is closed by an elastic conductive plate 9, and since current also flows through this conductive plate 9, both liquid contact plates 7 and 11
Zero current is a straight line, and so is magnetic flux.

In the manual off operation, even if the movable contact plate 7 is separated, the plunger 5 does not move at a fixed position, so the elastic conductive plate 9 is bent and only the movable contact plate 7 is separated.

In addition, at this time, the electromagnetic repulsion forces of both act together to some extent.

Then, when an overcurrent flows, especially since the overcurrent is a large current, the triggering force is also strong, and the plunger 5 is instantly released.
This facilitates the movement of the valve and separates it, turning it off.

(Effects) As described above, when the present invention is turned on, the insertion hole 8 of the plunger 5 is closed by the elastic conductive plate 9 fixed to the movable contact plate 7, so that the current also flows through the elastic conductive plate 9. By allowing the current to flow around the insertion hole 8 of the plunger, there is no mismatch in the magnetic flux with the fixed contact plate 11, thereby preventing the electromagnetic repulsion from being impaired.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the switching device of the breaker according to the present invention, in which Figure 1 is a sectional view, Figure 2 is an operational diagram, and Figure 3 is a diagram showing the operation.
The figure is an exploded perspective view, and FIG. 4 is a diagram of a conventional example. 5... Plunger, 7... Movable contact plate, 8... Hole, 9... Elastic conductive plate, 11
...Fixed contact plate.

Claims (1)

[Claims] 1. A plunger that performs a suction operation in response to overcurrent. A movable contact plate, through which the plunger is inserted, performs on/off operations independently when there is no overcurrent, and which performs off operation by the suction operation of the plunger when overcurrent occurs; In a breaker consisting of a fixed contact plate whose current direction is opposite to the direction of current flowing through the contact plate, the movable contact plate has four parts in which the head of the plunger is hidden in the hole through which the plunger is inserted, and a concave part in which the head of the plunger is hidden. An opening/closing device for a circuit breaker, wherein a base end of an elastic conductive plate for positioning the head of the plunger and closing the hole is fixed to the movable contact plate.