JPS6339868Y2 - - Google Patents

Description

[Detailed explanation of the device] This device separates the movable electrode from the fixed electrode to cut off the current, and if an arc occurs between the two electrodes when the movable electrode separates, the arc is moved by the force of the magnetic field. This invention relates to an arc rotation drive gas circuit breaker that quickly extinguishes the arc by blowing it with arc-extinguishing gas.

This type of arc rotation driven gas circuit breaker is generally constructed as shown in FIG. The movable electrode 5 is moved to the arc runner 53 as shown in FIG.
1, arc 54, arc runner 53, cylindrical electrode 5
5. A magnetic flux Φ is generated by the current flowing in the path between the coil 56 and the fixed electrode 52, and the arc 54 is caused to run around the movable electrode 51 by the magnetic flux Φ, and is blown against the arc-extinguishing gas filled there. I'm trying to turn off the arc. However, in the above case, since the above process goes through, after an arc is generated between the movable electrode 51 and the fixed electrode 52, the arc 54 transferred to the arc runner 53 is extinguished as described above. The disadvantage is that it takes a relatively long time to complete and the electrodes are easily damaged.

In order to solve the above-mentioned drawbacks, the movable electrode is provided with an arc contact and a brim-shaped main contact, and the fixed electrode is provided with a protruding claw-shaped main contact that contacts the main contact. An arc contactor in contact with the arc contactor and an arc extinguishing cylinder having an arc driving coil are insulated and attached to the fixed electrode, one end of the arc driving coil is connected to the arc extinguishing cylinder and the other end is connected to the fixed electrode. There are some that have a connected configuration (for example, Utility Model Application No. 50-119958).

However, with the above configuration, when the circuit breaker is in the closed state, a shunt current constantly flows through the arc drive coil due to the contact resistance that exists between the main contacts, causing the coil to generate heat. do. This heat generation has the problem of deteriorating the insulating resin material that holds the coil.

On the other hand, if the resistance value of the arc drive coil is increased, the shunt current can be reduced.
However, when the resistance value is increased in this way, when the main contactor opens during the breaking operation of the circuit breaker, a large current flows through the coil, causing a large amount of heat to be generated in the coil. Therefore, there is a problem in that the resin deteriorates rapidly as the above-mentioned shutoff operation is repeated.

If the resin deteriorates in this way, when a large current flows through the coil during the breaking operation as described above, the force generated in the coil by the large current that spreads in the outer circumferential direction will cause the coil to be damaged by the resin. There is a danger of it being destroyed.

Furthermore, the above-mentioned special configuration (a configuration with a large brim-shaped main contactor or a claw-shaped main contactor)
This also has the disadvantage that, in manufacturing this, a completely different production line from the one used to manufacture the one shown in FIG. 4 has to be set up.

Therefore, the present invention has been developed to eliminate the above drawbacks, and not only can the generation of arcs be kept to a minimum, but even if an arc begins to occur, it can be extinguished quickly, thereby preventing damage to the electrode and extending its life. In addition, the heat generated by the arc drive coil is
Even if it is possible to reduce the risk to zero in the above-mentioned closing state and to a small amount even in the shut-off operation, and to eliminate the above-mentioned dangers in advance, and has such numerous usefulness, it is structurally The present invention is intended to provide an arc rotation driven gas circuit breaker which can be manufactured using a conventional manufacturing line with only slight design changes.

The drawings 1 and 2 showing embodiments of the present application will be described below. The members designated by reference numerals 1 to 21 are equivalent to those in a known arc-driven gas circuit breaker. 1 is the case, the first
The upper part in the figure shows the inside of the case, and the lower part shows the outside of the case. In addition, inside the case
It is filled with arc-extinguishing gas such as SF ₆ . . Reference numeral 2 indicates a bushing fixed to the case 1 in an airtight state, 3 indicates a metal plate for sealing fixed to the bushing 2, and 4 indicates an external terminal on the bushing 2. Reference numerals 5 and 6 denote insulating protrusions, which are designed to increase the creepage distance of the bushing and improve its withstand voltage, and are each formed in an annular shape. Next, in the fixed electrode indicated by the reference numeral 7, 8 is a support screwed to the external terminal 4, 9 is an upper support portion thereof, and 10 is a cover screwed to the support 8, which is made of a metal material. . 11
is a finger contact portion left inside the cover 10,
12 is an arc-proof member attached to one end, 13, 14
is a coil spring whose finger contact portions are brought into pressure contact with a movable electrode and an upper support portion 9 of the support body 8, which will be described later, respectively. Note that an insulating paper 15 is interposed between these springs 13, 14 and the cover 10, so that the springs 13, 1
4 to prevent them from being melted and damaged by current flowing through them. Next, reference numeral 18 denotes a movable electrode, which is configured to be able to move back and forth between an input position shown by a solid line and an open position shown by a phantom line.
In this movable electrode 18, 19 is a base body, 20 is a contact body screwed onto the base body 19, and 21 is an arc-proof member fixed to the contact body 20. Reference numeral 22 denotes an insulator provided around a part of the base 19, and is made of an insulating material with good heat resistance and abrasion resistance (for example, Teflon).
It is formed to have the same diameter as the outer diameter of 0. Furthermore, this insulator 2
The arrangement position of No. 2 is set at a position where the inner circumferential edge of an arc runner, which will be described later, comes into contact when the movable electrode 18 is in the closing position as shown by the solid line in FIG.
In addition, the length dimension, especially the dimension on the tip side of the movable electrode (also called critical dimension), is such that when the movable electrode 18 separates from the fixed electrode 7 as described later, the arc-proof member 21 at the tip of the movable electrode comes into finger contact. The inner circumferential edge of the arc runner, which will be described later, is configured to have a dimension that allows it to come into contact with the contact body 20 before it separates from the portion 11.

Next, reference numeral 25 denotes a support fixed to the case 1, which is made of an insulating material and formed into a cylindrical shape. A connecting body 26 is screwed onto the support body 25 and is formed into an annular shape from a metal material (copper, iron, etc.). Reference numeral 27 indicates a protruding body integrally formed with the connecting body 26, 28 indicates an arc runner formed in the shape of a disc, a base 29 integrally formed with the protruding body 27, and an arc-resistant member (made of well-known material) fixed to the base. ) consists of 30. 31 indicates a through hole provided in the center of the arc runner 28;
Its diameter is the arc-proof member 3 in the arc runner 28.
The inner peripheral edge of the movable electrode 18 has the same size as the diameter of the movable electrode 18 so that it can rub against the side surface of the movable electrode 18.
The connecting portion 32 between the ejector 27 and the connecting member 26 is formed thin by providing a groove 33 as shown in the figure, and the arc runner 28 and the ejector 27
A crack 34 as shown in FIG. 2 is formed in the arc runner 2 up to the connecting portion 32.
Each of the divided pieces in 8 can be moved toward the center (the diameter of the through hole 31 can be narrowed). Further, each element in the arc runner 28 is urged in the above direction by a coil spring 35. Reference numeral 36 denotes a cylindrical electrode for arc extinguishing, which is arranged around the movement locus of the movable electrode 18, and is fixed to the connecting body 26 with a set screw 37. Also, this cylindrical electrode 3
6 is made of copper. 38 is an arc driving coil wound around the cylindrical electrode 36, one end 39 of which is connected to the cylindrical electrode, and the lead 41 of the other end 40 is connected to the fastening part 42.
They are each connected to a support 8. 43 indicates a coil holder. Insulating paper is interposed between the layers of wire in this coil 38 and between the coil and the cylindrical electrode 36 or holder 43. Further, the coil 38 may be molded with resin. 44 is a cylindrical electrode 36 and a coil spring 3.
5, which is used for the same purpose as the insulating paper 15. Also 4
Reference numerals 5 and 46 indicate gas discharge passages, and 47 indicates a gas discharge port.

Next, the operation of the above configuration will be explained. First, when the movable electrode 18 is in the input position shown by the solid line in FIG. Current flows through the path.

Next, the operation when moving the movable electrode 18 upwardly away from the fixed electrode 7 in FIG. 1 for opening is as follows.

First, when the state as shown in FIG. 3A is reached, the current can flow in a branched manner between the movable electrode 18 and the fixed electrode 7 via the arc runner 28 and the arc drive coil 38. Therefore, as shown in FIG. 3B, from the fixed electrode 7 to the movable electrode 18
Even if they separate (strictly speaking, the arc-proof members 12 and 2
1 period), almost no arc occurs. Further, in this state, a current flows between the movable electrode 18 and the fixed electrode 7 via the arc runner 28, the cylindrical electrode 36, and the arc drive coil 38. (The arc driving coil 38 is of a thickness that can withstand such a current.) Therefore, a magnetic flux Φ as shown by the broken line in FIG. 1 is generated inside the cylindrical electrode 36.

Next, as shown in FIG. 3C, the movable electrode 1
8 (arc-resistant member 21) separates from arc runner 28 (arc-resistant member 30) and an arc 48 begins to occur between them, at the same time as the arc 48 begins to occur, the arc 48 that has already occurred as described above The arc 48 is driven to rotate around the axis 49 by the magnetic flux Φ, and is blown out relative to the arc-extinguishing gas present therein, so that it is quickly extinguished.

As described above, in this invention, when the movable electrode 18 is separated from the fixed electrode 7 to cut off the current, the movable electrode 18 and the arc runner 2 are separated from each other before the movable electrode 18 separates from the fixed electrode 7.
8 are in contact with each other to allow current to flow from the movable electrode 18 to the fixed electrode 7 via the arc runner 28, the arc drive coil 38, etc.; This has the effect of preventing arcs from occurring and preventing damage to those electrodes due to arcs.

Moreover, as described above, the arc drive coil 3
Since the current flows through the arc runner 8, when the movable electrode 18 separates from the fixed electrode 7 as described above and subsequently separates from the arc runner 28 when the current is interrupted, the movable electrode 18 and Even if an arc is about to occur between the arc runner 28 and the arc drive coil 38,
Due to the magnetic field generated by the current flowing through the
The above-mentioned arc can be quickly extinguished by rotating and blowing the arc-extinguishing gas from the moment it begins to occur, thereby extending the life of the movable electrode with almost no damage. This has the effect of achieving

Moreover, as described above, even if the current is made to flow through the arc drive coil 38 before an arc occurs, in the normal case when the circuit breaker is in the closed state, the insulator is 22, it is possible to prevent current from flowing through the arc drive coil 38,
As a result, the coil 38 has the advantage of being able to prevent heat generation.

Furthermore, since no current is passed through the coil 38 as described above, the coil 38 has the advantage of being able to use a low-resistance coil. This has the effect of minimizing heat generation even if a large current is passed through the coil 38 when driving the arc as described above during the breaking operation.

The fact that the arc driving coil 38 generates no or little heat in this way has a great effect in solving the conventional problems caused by the heat generated.

Furthermore, even though it has the above-mentioned excellent features, its structure is different from that of the conventional product shown in FIG. Since the structure is such that only an insulator 22 is attached to the electrode 18, manufacturing requires only a slight design change to the conventional product shown in FIG. 4, and the manufacturing line of the conventional product shown in FIG. It has practical effects that allow it to be used and manufactured as is.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, in which Fig. 1 is a vertical sectional view of the main part of the gas circuit breaker, Fig. 2 is a sectional view taken along the - line, Fig. 3 is a schematic illustration of the operating process, and Fig. 4 is a conventional one. FIG. 2 is a schematic diagram of an arc rotation driven gas circuit breaker having the following configuration. 7...Fixed electrode, 18...Movable electrode, 28...
Arc runner, 36...Cylindrical electrode, 38...Arc drive coil, Φ...Magnetic flux.

Claims (1)

[Scope of utility model registration request] A fixed electrode and a rod-shaped movable electrode are provided in a case filled with arc-extinguishing gas, and the movable electrode reciprocates between an input position where it is connected to the fixed electrode and an open position where it is separated from the fixed electrode. Further, an arc-extinguishing cylindrical electrode is disposed within the case around the movement locus of the movable electrode, and inside the arc-extinguishing cylindrical electrode, A disc-shaped arc runner having a through hole large enough to allow the movable electrode to pass through is installed in the center of the arc runner, and the arc runner is installed at a position where the through hole overlaps the forward and backward locus of the movable electrode. Furthermore, one end is connected to the arc extinguishing cylindrical electrode and the other end is connected to a fixed electrode on the outer circumferential side of the arc extinguishing cylindrical electrode, and the arc extinguishing cylindrical electrode is connected by energizing itself. An arc driving coil capable of applying a magnetic field parallel to the advance/retreat trajectory of the movable electrode is disposed inside, and when the movable electrode is separated from the fixed electrode, an arc is generated between the movable electrode and the arc runner. Sometimes, the current of the arc flows through an arc runner and a cylindrical electrode to an arc driving coil, and the magnetic field generated by the coil drives the arc to rotate around the forward and backward locus of the movable electrode, extinguishing the arc. In an arc-rotation-driven gas circuit breaker in which the arc is extinguished by blowing against a gas relatively, an insulator is provided around a part of the rod-shaped movable electrode, and the outer diameter of the movable electrode is equal to that of the movable electrode. The diameter of the through hole in the disc-shaped arc runner is formed to be the same as the outer diameter, and the diameter of the through hole in the disc-shaped arc runner is formed to a size that allows the inner peripheral edge of the arc runner to rub against the outer peripheral surface of the movable electrode when the movable electrode advances and retreats. The insulator in the movable electrode is provided at a position where the inner circumferential edge of the through hole of the arc runner is in contact with the movable electrode when the movable electrode is in the closing position, and the critical dimension of the insulator on the tip side of the movable electrode is such that the tip of the movable electrode An arc characterized in that when the movable electrode is separated from the fixed electrode, the outer periphery of the movable electrode and the hole edge of the arc runner are brought into contact with each other before the two are separated, and the arc is configured to have dimensions that do not impede conduction between the movable electrode and the arc runner. Rotation driven gas circuit breaker.