JPS6224913Y2 - - Google Patents

Description

[Detailed explanation of the idea] This proposal concerns the improvement of gas cylinders and disconnectors.

Recently, in order to facilitate arc extinguishing, arc-rotating type gas shields and disconnectors have appeared in which the arc generated between contacts is driven by a magnetic drive coil.

By the way, as shown in FIG. 1, a conventional device of this type has a fixed contact 1, an iron core 2, an insulating spacer 3, and a magnetic drive coil 4 arranged concentrically, and a movable contact 5.
A disk-shaped arc runner 6 is disposed below the coil 4 so as to face it, and the coil 4 is fixed to this. A ring 6a made of an arc-resistant material is attached to the inner circumference of the arc runner to prevent damage caused by arc, and the entire ring 6a is placed in an atmosphere of an insulating gas 7 such as SF ₆ gas.

Therefore, in order to improve the shearing performance in the medium and small current range in this type of shear breaker, it is necessary to provide an appropriate phase difference between the current and the magnetic flux. In the structure shown in FIG. 1, the arc runner 6 forms a short circuit ring,
This is made possible by the secondary magnetic flux induced when the magnetic flux from the coil 4 interlinks with this short circuit ring.

However, in a large current range, a strong electromagnetic repulsive force acts between the coil 4 and the arc runner 6 that holds it, causing separation between the two and deformation of the arc runner 6, making it difficult to take countermeasures. There are drawbacks.

The purpose of this project is to provide a gas shield and breaker that prevents deformation and separation of the arc runner and coil fixing disk during large current shielding while maintaining shielding performance in the medium and small current range. It is in.

The present invention will be explained below based on FIG. In the figure, 21 is a shorting ring made of a cylindrical conductive material arranged inside the magnetic drive coil 4, and 22 is a copper-tungsten-based shorting ring attached to the inner periphery of the lower end of the shorting ring 21 by welding, brazing, etc. An arc-resistant arc runner made of a material, 23 is a coil fixing disk disposed on the outer periphery of the arc runner and positioned below the magnetic drive coil 4, and this disk is welded to the short circuit ring 21. , attached by brazing, etc. Further, the disc 23 is made of a material having high strength and a resistivity larger than that of the shorting ring 21. For example, the shorting ring 21 is made of copper.
A combination of stainless steel is used for the disc 23. Otherwise, the same reference numerals as in FIG. 1 indicate the same or corresponding parts.

In the above configuration, when the current is interrupted, an arc is generated between the contacts 1 and 5, but the arc foot on the fixed contact 1 eventually moves onto the arc runner 22 and becomes an arc 24. Then, the current flows through the magnetic drive coil 4 - the fixing disk 23 - the shorting ring 21 - the arc runner 22 - the arc 24 - the movable contact 5.

The arc 24 is rotationally driven by the magnetic drive coil 4 and is extinguished.

At this time, the secondary current i is guided by the primary magnetic flux generated by the magnetic drive coil 4 and does not circulate within the fixed disk 23. However, since the fixing disk 23 is made of a material that is strong and has a higher specific resistance than the short-circuit ring 21, the secondary current i is suppressed to be extremely small. As a result, the magnetic drive coil 4
The electromagnetic repulsion between the fixing disk 23 and the fixing disk 23 is significantly reduced, making it easier to attach them, and preventing the fixing disk from deforming or detaching.

The arc runner 22 is located at the inner periphery of the lower end of the short circuit ring 21, and the electromagnetic repulsion between it and the magnetic drive coil 4 is extremely small. As a result, it will not be distorted or detached from its fixed position.

Further, due to the presence of the short circuit ring 21, the magnetic flux generated by the magnetic drive coil 4 and the arc current have a sufficient phase difference, and even in the medium and small current range, satisfactory or breaking performance is achieved.

As described above, according to the present invention, the gas shield and disconnector do not cause deformation or detachment of the arc runner or the coil fixing disk during large current shearing while maintaining the shearing performance in the medium and small current range. This has the effect of being able to provide the following.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional device, and FIG. 2 is a longitudinal sectional view showing one embodiment of the present invention. 1: Fixed contact, 4: Magnetic drive coil, 5: Movable contact, 7: Insulating gas, 21: Short circuit ring, 22:
Arc runner, 23: Disc for fixing the coil.

Claims (1)

[Claims for Utility Model Registration] A pair of contacts disposed in an insulating gas atmosphere; A magnetic drive coil disposed outside one of the pair of contacts; A cylindrical short-circuit ring disposed between the drive coil and the one contactor, an annular arc runner configured on the inner periphery of the lower end of the short-circuit ring, and a material having a higher specific resistance than the short-circuit ring. and a coil fixing disk fixed to the outer periphery of the lower end of the short circuit ring to which the magnetic drive coil is fixed.