JPH0432120A - Operation control device of breaker - Google Patents

Abstract

PURPOSE:To adjust attraction of movable iron core by an electromagnetic coil by moving a magnetic core inside an electromagnetic coil even when power supply voltage changed to change a current value flowing through the electromagnetic coil. CONSTITUTION:A bottomed cylindrical magnet core 15 is arranged in the inside of an electromagnetic coil 12 so as to be able to advance and retreat in the arrow direction in the inside of the electromagnetic coil 12. The magnet core 15 has a through hole 15A in the center of its bottom. A rod part of a return spring 14 connected to a movable core 9 goes through this hole 15. Accordingly, by rise and fall of the magnet core 15, magnetic flux density generated in the inside of the magnetic coil 12 changes to change attraction to the movable iron core 9 so as to change driving force of a trigger 8 connected to the movable iron core 9. Even when power supply voltage of a breaker, driving force of the trigger 8 can be always held at a fixed value by adjusting a position of the magnet core arranged inside the electromagnetic coil 12.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a circuit breaker operation control device, and more particularly to a circuit breaker operation control device that can adjust the attractive force of an electromagnetic coil.

[Conventional technology]

A conventional device of this type will be explained based on FIG. 2. As shown in FIG. ).

(1) is equipped with a fixed contact (2) and a movable contact (3) attached to the main circuit. Terminal (
1) and (1) are configured to conduct electricity between them.

An abbreviated operating lever (5) is connected to the movable contactor (3) via an insulating rod (4).
The movable contact (3) swings about the pivot point (7) with the urging force of the blocking spring (6) connected thereto.
) is separated from the fixed contact (2) to cut off the current. Further, a trigger (8) is engaged with the operation lever (5). The trigger (8) is
It is connected to the upper end of the movable core (9) via the iron (10), and the pivot point (11) is
) to engage or disengage the operating lever (5). The movable iron core (9) has a frame (13) housing the electromagnetic coil (12).
) and connected at the lower end to the return spring (14), both of which (12), (1
4) cooperate to reciprocate in the axial direction within the electromagnetic coil (12).

Next, the operation will be explained.

To interrupt the current of the circuit breaker, the movable contact (3) is connected to the fixed contact (
2).

That is, when a current is applied to the electromagnetic coil (12), the electromagnetic coil (12) moves the movable iron core (9) by an electromagnetic force predefined by the coil shape, number of turns, and current value.
) is returned and inflated against the biasing force of the spring (14). Along with this movement, the movable iron core (9) urges the trigger (8) via the rod (10) to remove the trigger (8) from the operating lever (5). The operating lever (5) that has come off the trigger (8) is biased by the interrupting spring (6) to push up the movable contact (3) and separate it from the fixed contact (2). let

(Problem to be Solved by the Invention) However, since the control circuit coil of a conventional circuit breaker is configured as described above, when the value of the current flowing through the electromagnetic coil (12) changes, it acts on the movable iron core (9). The electromagnetic force also changes and the driving force required to drive the trigger (8) changes.Therefore, if the power supply voltage is 100V, for example,
If the 200v and the specifications of the circuit breaker change, the driving force of the trigger (8) will also change, making it impossible to drive the trigger (8) with a constant driving force. Trigger (8)
In order to act with a constant driving force, it is necessary to manufacture electromagnetic coils (12) that apply different driving forces for each specification, which increases the number of types of devices and increases costs. Ta.

The present invention was made to solve the above problems, and
An object of the present invention is to provide a circuit breaker operation control device that can keep the electromagnetic force acting on a movable core constant even if the power supply voltage of the circuit breaker control circuit changes and the current value flowing through the electromagnetic coil changes. There is.

[Means to solve the problem]

A control circuit coil for a circuit breaker of the present invention includes an electromagnetic coil, a movable core surrounded by the electromagnetic coil, and a movable contact that moves into and out of contact with a fixed contact in conjunction with the operation of the movable core,
In the circuit breaker operation control device that operates the movable contactor via the movable iron core by applying a closing or tripping current to the electromagnetic coil, the inside of the electromagnetic coil is configured to move forward and backward relative to the electromagnetic coil. It is constructed by arranging a magnetic core that can be used.

[Effect]

According to the present invention, even if the power supply voltage changes and the value of the current flowing through the electromagnetic coil changes, the attractive force of the movable iron core by the electromagnetic coil can be adjusted by moving the magnetic core within the electromagnetic coil. .

〔Example〕

Hereinafter, the features of the present invention will be mainly explained based on the embodiment shown in FIG. 1, with the same or corresponding parts as those of the conventional art being given the same reference numerals. Incidentally, FIG. 1 is a system diagram showing one embodiment of the circuit breaker operation control device of the present invention.

The circuit breaker operation control device of this embodiment, like the conventional one, includes an electromagnetic coil (12), a movable core (9) surrounded by the electromagnetic coil (12), and a control device for controlling the operation of the movable core (9). trigger (8), operation lever (5) and insulating rod (4)
The movable contact (3) is interlocked with the fixed contact (2) and moves toward and away from the fixed contact (2).

As shown in FIG. 1, the device of this embodiment has a bottomed cylindrical magnetic core (15) inside the electromagnetic coil (12) as shown by the arrow in the figure. It is distinctive in that it is arranged so that it can move forward and backward (up and down) in different directions. The magnetic core (15) has a hole (15A) in the center of its bottom surface.
passes through this hole (15A), and a loft portion of a return spring (14) connected to the movable iron core (9) passes through this hole (15A).

Therefore, as the magnetic core (15) moves up and down in the direction of the arrow in FIG. 1, the magnetic flux density generated inside the magnetic coil (12) changes, and the attractive force against the movable iron core (9) changes. In turn, the driving force of the trigger (8) connected to the movable iron core (9) can be changed. In other words,
Magnetic core (15) inside the electromagnetic coil (12)
By adjusting the position of the movable iron core (9), the electromagnetic force acting on the movable iron core (9) can be adjusted and controlled. In other words, the driving force of the trigger (8) is generally constant, so when the power supply voltage of the control device changes and the current flowing through the electromagnetic coil (12) changes, the driving force of the magnetic core (15) changes. ) The electromagnetic force acting on the movable core (9) from the electromagnetic coil (12) can be made constant.

As explained above, according to the device of this embodiment, even if the power supply voltage of the circuit breaker changes depending on its specifications, the magnetic core (15) disposed within the electromagnetic coil (12)
) By adjusting the position of the trigger (8), the driving force of the trigger (8) can always be maintained at a constant value.
There is no need to manufacture multiple electromagnetic coils, and costs can be reduced.

In the above embodiments, only the device for tripping the circuit breaker has been described, but it goes without saying that the present invention can be similarly applied to the case of supplying current.

〔Effect of the invention〕

As described above, according to the present invention, since a magnetic core that can move forward and backward with respect to the electromagnetic coil is disposed inside the electromagnetic coil, the power supply voltage of the circuit breaker control circuit changes and the value of the current flowing through the electromagnetic coil changes. However, the electromagnetic force acting on the movable core can be made constant by adjusting the position of the magnetic core.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the circuit breaker operation control device of the present invention, and FIG. 342 is a block diagram showing a conventional circuit breaker operation control device. In each figure, (2) is a fixed contact, (3) is a movable contact, (
9) is a movable iron core, (12) is an electromagnetic coil, and (15) is a magnetic core. In each figure, the same reference numerals indicate the same or corresponding parts. 1s11:! A 2nd cause I compensation W expulsion possible V + binding Y movable &/(

Claims (1)

[Claims] an electromagnetic coil; a movable iron core surrounded by the electromagnetic coil;
A movable contact that moves toward and away from the fixed contact in conjunction with the operation of the movable iron core, and a cutoff that operates the movable contact via the movable core by applying a closing or tripping current to the electromagnetic coil. In the device operation control device,
An operation control device for a circuit breaker, characterized in that a magnetic core that can move forward and backward with respect to the electromagnetic coil is disposed inside the electromagnetic coil.