JPS63195923A - Magnetically shielding apparatus for 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 [Industrial Application Field] The present invention relates to a magnetic shield for preventing the influence of magnetic force on other phases in a switching device that utilizes magnetic force.

[Conventional technology]

A conventional device of this type is shown in FIG. In Figure 3, (1) is a fixed contact, and the nozzle (2) is a fixed contact.
) is attached to the insulator tank (8). A permanent magnet (3) is attached to the outer periphery of the nozzle (2) and provides a magnetic driving force to the arc (6) generated during the opening operation between the fixed contact +11 and the movable contact (4).

The slide contact (6) provides electrical current between the movable contact (4) and the terminal plate (7).

Next, the operation will be explained. In the circuit breaker shown in FIG. 3, when the contacts are closed, the current flows from the fixed contacts 111 to
It flows along the path from the movable contact (4) to the slide contact (61 to the terminal plate (7)).

At the time of disconnection, the movable contact (4) moves linearly downward. The arc (5) generated at this time is extinguished by receiving magnetic driving force from the permanent magnet (3).

FIG. 4 shows an example of the distribution of magnetic lines of force (910) caused by the permanent magnet (31). As shown in the figure, the magnetic field exerts an influence on the outside of the tank (8).

[The problem that the invention attempts to solve]

Conventional circuit breakers are configured as described above, so
The magnetic field generated by the permanent magnet not only provides a driving force to the arc, but also affects the outside of the tank, disturbing the magnetic fields of other phases, reducing the breaking performance, or attracting metal powder, etc. This had the disadvantage of reducing insulation performance.

This invention was made to solve the above-mentioned problems. By embedding a magnetic shield inside the insulating tank, the magnetic field generated by the magnet does not leak outside the tank, and it becomes stable. The purpose of the present invention is to provide a highly reliable magnetic shielding device for a switch that has breaking performance and insulation performance.

[Means for solving problems]

A magnetic shielding device for a switch according to the present invention has a magnetic shield embedded inside an insulating tank constituting a tonnage pole.

[Effect]

In this invention, the 6-magnetic shield prevents the magnetic field generated by the magnet from leaking out of the tank, and acts to prevent the magnetic field from affecting other nearby phases.

[Embodiments of the invention]

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

In Figure 1, which shows the cross section of the arc extinguishing chamber of the circuit breaker, (1)
is a fixed contact, which is housed in the insulator tank (81) together with the nozzle (2). The permanent magnet (3) is attached to the outer periphery of the nozzle (2) and is attached to a fixed contact (+1).
Arc (5) generated between 1 and the movable contact (4)
gives magnetic driving force to. The slide contact (6) is
Electrical communication between the movable contact 4) and the terminal plate (7)
Do turtle.

The shield (10) is embedded in the insulator tank (81) to prevent the magnetic field generated by the permanent magnet (3) from leaking outside the tank.

Further, the shield (10) also functions to prevent metal powder and the like from outside the tank from being adsorbed to the outer surface of the tank and to obtain stable insulation performance.

In the breaker shown in FIG. 1, the ridge current flows along a path from the fixed contact (11 to the movable contact (4) to the slide contact (6) to the terminal plate (7).

At the time of disconnection, the movable contact (4) moves linearly downward. The arc (5) generated at this time is a permanent magnet (:l
The arc is extinguished by receiving the magnetic driving force from IK. Although it acts on the magnetic field arc (61) generated by the permanent magnet (3), it does not affect the outside of the tank (81) because it is blocked by the shield (101).

FIG. 2 shows an example of the distribution of magnetic lines of force (91) due to the permanent magnet (3). As shown in the figure, the magnetic field is blocked by a shield (101).

In addition, although the case where a permanent magnet was used as a magnet was shown in the said Example, the case where an electromagnet was used and comprised the interrupting part may be sufficient.

〔Effect of the invention〕

As described above, according to the present invention, since the magnetic shield is configured to be embedded in the insulator tank, a highly reliable magnetic shielding device for a switch having stable breaking performance and insulation performance can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the arc extinguishing chamber of a magnetically driven type breaker according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of magnetic field line distribution, and FIG. FIG. 4 is a cross-sectional view showing the arc extinguishing chamber, and is a diagram showing an example of the distribution of lines of magnetic force. Figure VC C1 [11 is a fixed contact), +31 is a permanent magnet, (4) is a movable contact, +to+ is a shield,
(81) is a tank. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a switchgear that includes a fixed contact and a movable contact that move toward and away from each other, the arc generated between the fixed contact and the movable contact during an opening operation is driven and extinguished by using the magnetic force of a magnet. A magnetic shielding device for a switch, which is characterized by a magnetic shield made of a magnetic material attached to the interphase part in order to eliminate the influence of.