JPH08180772A - Rotary arc-type gas-blast circuit-breaker - Google Patents

Abstract

PURPOSE: To properly suppress secondary current generated in a conductive cylindrical body or an arc extinguishing cylinder and extinguish the arc by installing a tulip contactor, the cylindrical body surrounding the contactor, an insulating ring, the arc extinguishing cylinder provided with an arc runner, and an arc drive coil in a fixed electrode. CONSTITUTION: A tulip contactor 4 and a cylindrical body 15 surrounding the contactor and made of copper are fixed in a container 1 and an insulating ring 16 and an arc extinguishing cylinder 17 are fixed in the other end of the cylindrical body 15 and on the ring 16, respectively. Then, an arc drive coil 18 is coiled on the outer circumference of the cylindrical body 15 and the cylinder 17, one end and the other end of the coil 18 are connected with the cylindrical body 16 and the cylinder 17, and synthetic resin is poured to compose a united holding body 19. If an arc runner 8 is attached to the holding body 19, an arc leg generated above the contactor 4 at the time of parting a movable contactor 12 from the contactor 4 shifts to the runner 8. At that time, arc current flows to an electrode 13 through the coil 18 and the resultant magnetic fluxes of the generated magnetic field and the magnetic field attributed to secondary current become proper. As a result, it becomes easys to connect the coil 18 and arc can be extinguished at current zero point while being rotated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary arc type gas circuit breaker for extinguishing an arc by rotating the arc in an arc extinguishing gas.

[0002]

2. Description of the Related Art A conventional rotary arc type gas circuit breaker is shown in FIG.
As shown in FIG. 3, a fixed electrode 3 fixed to a support 2 made of a conductive material is provided on the upper end of a cylindrical container 1 made of an insulating material, and a tulip contact 4 is attached to this fixed electrode. 5
Is an external terminal attached to a fixed electrode, and 6 is a cylindrical arc-extinguishing tube made of a conductive material such as copper, which is attached to the fixed electrode via a holding plate 7 which surrounds the tulip contact and is made of an insulating material. An annular arc runner 8 made of a conductive material is provided at the end of the arc extinguishing cylinder. Reference numeral 9 denotes an arc drive coil wound around the outer circumference of an arc extinguishing cylinder, one end of which is connected to the arc runner, and the other end of which is connected to a fixed electrode via an embedded nut 10 described later. Reference numeral 11 denotes a holder made of a synthetic resin material, which encloses the arc extinguishing cylinder and integrally embeds the arc drive coil, the embedded nut 10 and the fixed electrode, and is fixed to the container 1. Reference numeral 12 is a movable contactor. When the movable contact 12 is separated from the tulip contact 4 by the opening command of the rotary arc type gas circuit breaker configured as described above, an arc is generated between the movable contact and the tulip contact. This arc extends as the gap between the movable contact and the tulip contact expands, and the arc foot on the tulip contact moves to the arc runner 8. When the arc foot moves onto the arc runner, the arc current passes from the movable contactor through the arc extinguishing gas, and then flows from the arc runner through the arc drive coil 9 and the embedded nut 10 to the support base 2 made of a conductive material. When the arc current flows through the arc drive coil, a magnetic field is generated in the arc drive coil, a secondary current flows in the arc extinguishing cylinder 6, and a combined magnetic flux of the magnetic field produced by the arc drive coil and the magnetic field produced by the secondary current acts on the arc. , The arc is extinguished at the current zero point while rotating.

[0003]

However, in such a conventional rotary arc type gas circuit breaker, the arc extinguishing cylinder 6 is attached to the fixed electrode 3 via the holding plate 7 made of an insulating material, and is attached to the outer circumference of the arc extinguishing cylinder. One end of the wound arc drive coil 9 is connected to an arc runner provided in an arc extinguishing cylinder, and the other end is connected to an embedded nut 10 embedded in a holder, and the embedded nut and a fixed electrode support base are fixed by bolts. In addition, the work is complicated because they are electrically connected to each other, and since the arc extinguishing tube is integrally formed with a conductive material such as copper, the magnitude of the secondary current generated in the arc extinguishing tube is different from that of the arc extinguishing tube. It depends on the material, and it was difficult to make the phase difference between the arc current and the synthetic magnetic flux appropriate. The present invention
The present invention has been made in order to solve such a problem, and an object thereof is to simplify the connection of the arc drive coil so that the arc drive coil can be reliably disconnected.

[0004]

In order to achieve the above object, a conductive cylinder around a movable and fixed electrode and around which an arc drive coil is wound is provided, and one leg of the arc generated between the electrodes is provided. In a rotary arc type gas circuit breaker in which the arc is moved to an arc runner of the conductive cylinder and the arc is rotated by an arc drive coil to extinguish the arc, a tulip contactor attached to a fixed electrode and one end surrounding the tulip contactor is fixed. A conductive tubular body fixed to the electrode, an insulating ring attached to the other end of the tubular body, a conductive arc-extinguishing tube having one end fixed to the insulating ring and an arc runner at the other end, the tubular body, and An arc drive coil is provided which is wound around the outer circumference of the arc extinguishing cylinder and has one end connected to the cylindrical body and the other end connected to the arc extinguishing cylinder.

[0005]

The function of connecting the arc drive coil to the tubular body or the arc-extinguishing cylinder is simplified, and a different metal or the same kind of metal is selected as the material of the tubular body or the arc-extinguishing cylinder to generate in the tubular body or the arc-extinguishing cylinder. The magnitude of the secondary current can be made appropriate.

[0006]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view of a main part of a gas circuit breaker. 2 that are the same as those in FIG. Reference numeral 13 denotes a fixed electrode fixed to the container 1 via an O-ring 14, to which an external terminal 5 is attached at one end and a tulip contact 4 is attached at the other end. Reference numeral 15 denotes a cylindrical cylindrical body made of copper, which surrounds the tulip contact and has one end fixed electrode 13
And an insulating ring 16 is fixed to the other end. Reference numeral 17 is a cylindrical arc extinguishing cylinder made of copper, one end of which is fixed to the insulating ring and the other end of which is an arc runner 8. Reference numeral 18 denotes an arc drive coil, one end of which is fixed to the arc runner and the other end of which is fixed to a cylindrical body. Reference numeral 19 is a holder formed by integrally molding a cylindrical body, an insulating ring, an arc extinguishing cylinder and an arc drive coil with a synthetic resin material. When manufacturing, the insulating ring 16 is fixed to one end of the cylindrical body 15, and the arc extinguishing cylinder 17 is fixed on the insulating ring. Next, the arc drive coil 18 is wound around the outer circumference of the cylindrical body and the arc extinguishing cylinder, and one end is electrically connected to the cylindrical body and the other end is electrically connected to the arc extinguishing cylinder. The thus constructed member is fixed to a mold frame (not shown), and synthetic resin is flowed to integrally form the holder 19, the arc extinguishing cylinder and the arc drive coil. The arc runner 8 is attached to the thus-configured one and screwed and fixed to the fixed electrode to form a gas circuit breaker. When the arc breaker on the tulip contact generated when the movable contact 12 is separated from the tulip contact 4 moves to the arc runner 8 when the gas circuit breaker configured as described above is cut off, the arc current disappears from the movable contact. It flows through the arc gas, flows from the arc runner to the fixed electrode 13 via the arc drive coil 18. When the arc current flows through the arc drive coil, a magnetic field is generated in the arc drive coil, and a secondary current is generated in the cylinder 15 and the arc extinguishing cylinder 17,
The combined magnetic flux of the magnetic field generated by the arc drive coil and the magnetic field generated by these secondary currents acts on the arc so that the arc is extinguished at the current zero point while rotating the arc. In the embodiment, the tubular body is made of copper, and the arc extinguishing tube is made of copper.However, without being limited to this, copper is used for the tubular body, brass is used for the arc extinguishing tube, or copper is used for the tubular body. By combining stainless steel for the arc extinguishing cylinder, in the arc extinguishing cylinder close to the arc, the induced secondary current is suppressed and the decrease of the magnetic flux acting on the arc is suppressed, and the arc extinguishing cylinder is induced in the cylinder away from the arc. An optimum combined magnetic field can be obtained by the secondary current.
Therefore, the optimum combined magnetic field can be obtained without reducing the magnetic flux necessary for extinguishing the arc.

[0007]

Since the present invention is configured as described above, the arc drive coil can be easily connected to the cylinder or the arc extinguishing cylinder, and the cylinder or the arc extinguishing cylinder can be made of a different metal or the same kind of metal. 2 that occurs in the selected cylinder or arc extinguishing cylinder
The magnitude of the secondary current can be made appropriate.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a gas circuit breaker according to the present invention.

FIG. 2 is a sectional view of a main part of a conventional gas circuit breaker.

[Explanation of symbols]

4 Tulip Contact 8 Arc Lanna 13
Fixed electrode 15 Cylindrical body 16 Insulating ring 17 Arc extinguishing cylinder 18
Arc drive coil

Claims (1)

[Claims] 1. An arc drive coil which surrounds a movable electrode and a fixed electrode, and is provided with a conductive tube around which an arc drive coil is wound, and one leg of an arc generated between electrodes is transferred to an arc runner of the conductive tube. In a rotating arc type gas circuit breaker for extinguishing by rotating the arc by, a tulip contactor attached to the fixed electrode, and a conductive tube body surrounding the tulip contactor and fixing one end to the fixed electrode,
An insulating ring attached to the other end of the tubular body, a conductive arc extinguishing tube having one end fixed to the insulating ring and an arc runner at the other end, and one end wound around the outer circumference of the tubular body and the arc extinguishing tube. A rotary arc type gas circuit breaker, comprising: an arc drive coil connected to a cylindrical body and the other end thereof connected to an arc extinguishing cylinder.