JPS5820441B2 - Kaihei Kinoden Kiyoku Kouzou - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electrode structure for a switch.

Recently, in response to demands from electric power and general consumers, large-capacity, small-sized switches using SF6 gas are being developed.

The purpose of the present invention is to efficiently extinguish the arc that occurs between the fixed electrode and the movable electrode when the load is released, and to make it possible to release the load with a short stroke, thereby making it possible to reduce the size of the switch. It is an object of the present invention to provide a novel switch electrode structure that can prevent burnout of the electrode portion due to arcing.

Hereinafter, the embodiments of the invention will be explained according to the drawings. First, Figs. is filled with SF6 gas.

Reference numeral 2 denotes power supply side bushings that are penetrated and fixed to one side wall of the case 1 at equal intervals for each phase, and 3 is a load side bushing that is penetrated and fixed to the other side wall of the case 1 so as to face these power supply side bushings 2. It's bushing.

4 is an interlocking shaft rotatably supported within the case 1 so as to be located between the bushings 2 and 3;
An operating handle 5 is attached to the end of the shaft that projects outward.

A fixed electrode assembly 6 is attached to the inner end of the conductor in the power supply side bushing 2 for each phase, and a movable electrode assembly 7 is attached to the interlocking shaft 4 for each phase in correspondence with each fixed electrode assembly 6. , by connecting the movable electrode assembly 7 and the inner end of the conductor in each load-side bushing 3, and by rotating the operating handle 5, the movable electrode is brought into contact with and separated from the fixed electrode in all phases simultaneously. I'm trying to get it.

Therefore, the structure of the fixed electrode assembly 6 is particularly changed to the first one.
To explain in detail according to FIGS. 3 to 3, reference numeral 8 denotes an electrode fixing base fixed to the inner end of the conductor in each power supply side bushing 2 with nuts 9, and the main fixed electrode is fixed on the inner surface of the lower end with a screw 10. 11 is fixed.

Reference numeral 12 denotes an auxiliary fixed electrode protruding diagonally downward from near the upper end of each electrode fixing table 8 so as to be located above and adjacent to the main fixed electrode 11, and has a bent portion 12a formed at its tip. There is.

Reference numeral 13 denotes a bottomed cylindrical magnet case fixed to the upper surface of each of the auxiliary fixed electrodes 12 by bolts 14, and has a swollen diameter portion 13a formed on the outer periphery of its upper end.

Reference numeral 15 designates an arc ring fixed to the outer periphery of each magnet case 13 so as to be located between the enlarged diameter portion 13a of the magnet case 13 and the bent portion 12a of the auxiliary fixed electrode 12.

16 is a ring-shaped permanent magnet that is housed and fixed in each magnet case 13; 17 is a yoke that is housed and fixed in the expanded diameter part 13a of each magnet case 13 so as to be in contact with the upper surface of the permanent magnet 16; and 18 is a ring-shaped permanent magnet that is housed and fixed in each magnet case 13. The enlarged diameter portion 1 covers the upper surfaces thereof.
This is a cover that is housed and fixed within 3a.

Therefore, as shown in FIG. 5, a magnetic flux B is generated near the auxiliary fixed electrode 12 from the permanent magnet 16 to the yoke 17.

Next, the configuration of the movable electrode assembly 7, especially the first
19 to be explained in detail according to FIGS.
is connected to the interlocking shaft 4 via the mounting bracket 21 by the bolt 20.
The movable part supports 22 fixed on the top for each phase are attached to each movable part support 1 via the electrode fixing base 24 with a plurality of screws 23 so as to be able to come into contact with and separate from each of the main fixed electrodes 11.
As shown in FIG. 2, the movable electrodes are protruding and fixed on the upper surface of the electrode 9, and as shown in FIG. 12, and when opened, the main contact portion 22
After a is separated from the main fixed electrode 11, the auxiliary fixed electrode 12
An auxiliary contact portion 2222b made of arc-resistant metal is provided with an arc-shaped upper end surface spaced apart from the auxiliary contact portion 2222b.

25 is a recess formed at the front edge of the upper end of the main contact portion 22a of each movable electrode 22, and 26 is a recess formed by the recess 25 to form an auxiliary contact portion 22b.
The movable electrode 2 is a point formed at the front end of the movable electrode 2.
2 is opened, the arc (■) generated between the auxiliary contact part 22b and the auxiliary fixed electrode 12 is prevented from moving to the main contact part 22a side, and the main contact part 22a is prevented from being burned out by the arc (2). There is.

Note that the pointed head 26 does not necessarily have to be formed by providing the recess 25 at the front edge of the main contact part 22a as in this embodiment (the front end of the auxiliary contact part 22b is formed by forming the front end of the auxiliary contact part 22b at the front edge of the main contact part 22a). It may also be formed to protrude further forward.

27 is a flexible conductive plate fixed at one end between the movable part support 19 and the electrode fixing base 24, and fixed at the other end to the inner end of the conductor in the load-side bushing 3 with a nut 28. The movable electrodes 22 of each phase are electrically connected to the conductor inside the bushing 3.

Next, the operation of the switch configured as described above will be explained.

Now, FIG. 2 shows the closed state of the switch in which the movable electrode 22 is in pinch contact with the main fixed electrode 11 at the main contact portion 22a.

In this state, when the interlocking shaft 4 is rotated clockwise in FIG. 2 by the operating handle 5, the movable electrode 22 moves from the A position shown by the solid line to the B position shown by the chain line, and reaches the Cfff position. The main contact portion 22a separates from the main fixed electrode 11 when moving from the position B (ffl), and then the auxiliary contact portion 22b separates from the auxiliary fixed electrode 12 when moving from the 8th position to the C position.

Therefore, no arc occurs between the main contact portion 22a and the main fixed electrode 11, and they are not burned out by the arc.

On the other hand, when the movable electrode 22 moves from the B (SIZ) position and the auxiliary contact portion 22b separates from the auxiliary fixed electrode 12 as described above, an arc I is created between them as shown in FIGS. 5a and 5b.
occurs.

However, this fixed electrode section is provided with a permanent magnet 16, and since the magnetic flux B of the permanent magnet 16 is generated in a direction that intersects the arc (2), the arc (2) is caused by the magnetic flux B as shown in Fig. 5 at the same time as it is generated. The arc is driven in the direction of the arrow or in the direction opposite to the arrow, and even if the opening stroke of the movable electrode 22 is small, the arc length is extended and the arc is extinguished by the SF6 gas in the switch case 1.

In addition, permanent magnets generally have the characteristic that the magnetic flux coming out from the north pole passes through the shortest distance and enters the south pole, and in a permanent magnet without a yoke, the magnetic flux flows near the magnet as shown by the broken line Ba in Figure 5a. A magnetic flux is generated, and in this embodiment, a magnetic flux is generated from the ON pole of the permanent magnet 16 to the yoke 17, as shown by the broken line B in the figure, and acts effectively at right angles to the arc (2).

Therefore, as shown in FIG. It revolves around the outer periphery of the magnet case 13, is greatly extended, and is effectively extinguished by the SF6 gas.

Furthermore, the arc (2) generated at the auxiliary contact portion 22b of the movable electrode 22 tends to move toward the main contact portion 22a, but
Since the pointed head 26 is formed at the far end of the auxiliary contact portion 22b, migration of the arc I can be completely prevented, and the risk of the main contact portion 22a being burnt out by the arc can be prevented. can.

Next, a second embodiment of the present invention shown in FIGS. 6 and 7 will be described. This embodiment has a structure of the fixed electrode assembly 6, particularly a structure for magnetic arc extinguishing using an auxiliary fixed electrode and a permanent magnet. This is different from the first embodiment described above.

Hereinafter, the details of components that are the same as or similar to those in the first embodiment will be described using the same reference numerals as in the first embodiment. A pair of arc extinguishing cylinders with a lid and a bottom are disposed opposite each other, and a groove 32 is formed in the side wall and bottom wall of the lower cylinder 31 to allow the movable electrode 22 to enter therein.

Reference numeral 33 denotes a permanent magnet embedded in the centers of the two cylindrical bodies 30 and 31, and 34 and 35 indicate a pair of covered and bottomed cylindrical yokes embedded in the two cylindrical bodies 30 and 31. The permanent magnet 330 is in contact with both ends of the permanent magnet 330.

Reference numeral 36 denotes an auxiliary fixed electrode protruding above one side of the fixed electrode stand 8 that supports the main fixed electrode 11, and is connected to the lower cylindrical body 31.
An arc ring 36a is formed so as to extend upward through the bottom wall of the permanent magnet 33 and to be wound around the outer periphery of the permanent magnet 33 via an insulating part.

Therefore, in this embodiment, as shown in FIG. 7a, a magnetic flux B is generated between the outer peripheral edges of both yokes 34 and 35 by the permanent magnet 33, and when the electrodes are opened, the main contact portion 22a of the movable electrode 22 is After separating from the main fixed electrode 11, the auxiliary contact part 22b separates from the auxiliary fixed electrode 36, and both 22b
, 36, the arc I moves along the auxiliary fixed electrode 36 to the arc ring 36a as the movable electrode 22 moves, and intersects the magnetic flux B.

As a result, as in the case of the first embodiment, the arc (2) is driven by the magnetic flux B in the direction of the arrow in FIG. Even if the opening stroke of the movable electrode 22 is small, the arc length is long and the arc is effectively extinguished by the SF6 gas.

As described in detail above, in the present invention, an auxiliary fixed electrode is disposed adjacent to the open side of the main fixed electrode, and a movable electrode that corresponds to the main fixed electrode so as to be able to come into contact with and separate from the main fixed electrode is connected to the main fixed electrode when it is turned on. In the electrode structure of the switch, which is provided with a main contact part that makes contact, and an auxiliary contact part which separates from the auxiliary fixed electrode after the main contact part separates from the main fixed electrode when opened, the auxiliary fixed electrode has an arc. A permanent magnet is provided inside the arc ring, and a yoke having a larger diameter than the arc ring is arranged adjacent to at least one end of the permanent magnet, so that when the arc ring is opened, the auxiliary fixed electrode and the auxiliary contact portion are connected to each other. The arc generated between the permanent magnet and the yoke is driven by the magnetic flux generated between the permanent magnet and the yoke, or between the yokes disposed at both ends of the permanent magnet, and is rotated and extinguished by the arc ring. The arc that occurs between the electrode and the movable electrode is efficiently extinguished (arc), allowing for load release with a small stroke. It has an excellent effect of preventing burnout.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a switch showing the first embodiment of the invention, Fig. 2 is an enlarged longitudinal sectional view of the main part thereof, Fig. 3 is a cutaway perspective view of the main part of the fixed electrode assembly, and Fig. 4 is a cross-sectional view of the switch showing the first embodiment of the invention. FIG. 5A is a partial perspective view of the movable electrode assembly; FIG.
The figure is a cutaway perspective view of main parts showing the second embodiment of the present invention.
Figure a is a vertical cross-sectional view of the main part for explaining the operating state,
Figure 1 is the same (this is a cross-sectional view of the main parts. Switch case 1, fixed electrode assembly 6, movable electrode assembly IJ 7, main fixed electrode 11, auxiliary fixed electrode 12)
, arc ring 15, permanent magnet 16, movable electrode 22, main contact part 22a, auxiliary contact part 22b, pointed head 26, permanent magnet 33, auxiliary fixed electrode 36, arc ring 36a0

Claims (1)

[Claims] 1 Auxiliary fixed electrode 1 adjacent to the open side of main fixed electrode 11
2, and the movable electrode 22, which corresponds to the main fixed electrode 11 so as to be able to come into contact with and separate from it, is provided with a main contact part 22a that contacts the main fixed electrode 11 when it is turned on, and the main contact part 22a that comes into contact with the main fixed electrode 11 when it is released. In the electrode structure of the switch in which an auxiliary contact part 22b is provided which is separated from the auxiliary fixed electrode 12 after being separated from the fixed electrode 11, the auxiliary fixed electrode 12 is provided with an arc ring 15, and an arc ring 15 is provided inside the arc ring 15. A permanent magnet 16 is disposed, and a yoke 17 having a larger diameter than the arc ring 15 is arranged adjacent to at least one end of the permanent magnet 16, and when opened, the auxiliary fixed electrode 12 and the auxiliary contact portion 22b are connected to each other.
A yoke 3 disposed between the permanent magnet 16 and the yoke 17 or at both ends of the permanent magnet 160
4. An electrode structure for a switch, characterized in that it is configured to be driven by a magnetic flux B generated between 4 and 35, and to rotate and extinguish the arc at the arc ring 15.