JPH08138506A - Thermal puffer gas-blast circuit breaker also using magnetic drive - Google Patents

Abstract

PURPOSE: To provide a thermal puffer gas-blast circuit breaker also using magnetic drive and having a booster chamber simple in structure, mitigating the electric field with moving arc contacts, and capable of coping with a high voltage. CONSTITUTION: A fixed arc contact 5 and a magnetically driving coil 6 are arranged in a booster chamber 4, and a fixed main contact 8 is arranged outside the booster chamber 4. The booster chamber wall 1 of the booster chamber 4 on the fixed contacts 5, 8 side is made of a conductive material, and the booster chamber wall 3 on the moving contacts 9, 10 side is made of an insulating material. The booster chamber 4 is arranged so that the insulating material portion of the booster chamber wall 3 is located on the outer periphery of the coil 6. The fixed main contact 8 is fitted to the conductive material portion of the booster chamber wall 1. Even when the magnetic field is generated by the coil 6 at the time of a current cutoff, no current flows on the booster chamber wall 3 made of the insulating material, and it is unnecessary to provide a slit on the booster chamber wall 3 or to fill an insulating material in the booster chamber wall 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic drive combined thermal puffer type gas circuit breaker which is a gas circuit breaker for electric power.

[0002]

2. Description of the Related Art The structure of a conventional magnetic drive combined thermal puffer type gas circuit breaker will be described with reference to FIG. In the following description, the magnetic drive combined thermal puffer type gas circuit breaker may be simply referred to as a gas circuit breaker. FIG. 2 shows a closed state of the gas circuit breaker. When the current of the gas circuit breaker is cut off, the movable main contact 10 and the movable arc contact 9 are moved downward by an operating mechanism (not shown).

During the interruption operation, the arc generated between the movable arc contact 9 and the arc runner 7 is rotationally driven by the magnetic field generated by the coil 6 and moves at high speed in the gas space in the booster chamber 4. As a result, gas is blown relatively to the arc, and the arc is extinguished. Further, the arc moving at high speed in the gas space in the pressure increasing chamber 4 increases the pressure of the gas in the pressure increasing chamber 4. When the movable arc contact 9 further moves downward and the tip of the pressure-increased gas comes off the nozzle 2, the pressure-increased gas is ejected to the outside of the pressure-increasing chamber 4 through the nozzle 2 to blow out the arc, and the heat puffer extinguishes the arc. .

In the conventional gas circuit breaker described above, the fixed main contact 8 and the movable main contact 10, which are the energizing paths at the time of closing, are provided outside the boosting chamber 4, and the fixed main contact 8 is attached to the boosting chamber wall 11. It was Therefore, the pressure chamber wall 11 is made of metal. Since the metal pressure chamber wall 11 is arranged close to the outer circumference of the coil 6,
A magnetic field generated by the coil 6 causes a current 12 to flow in the circumferential direction of the pressure chamber wall 11. To prevent this, the pressurizing chamber wall 11
, An interrupt is provided in the direction parallel to the magnetic field (vertical direction),
It has been performed to fill the interrupt portion with an insulator.

[0005]

In the conventional gas circuit breaker described above, it is difficult to manufacture the booster chamber because it is necessary to provide an interrupt in the wall of the booster chamber made of a conductive material and fill the interrupt with an insulator. It was Further, since the movable arc contact has a structure in which the tip of the movable arc contact is projected, the electric field becomes high, which is disadvantageous when the voltage of the gas circuit breaker is increased.

An object of the present invention is to provide a heat pumper type gas circuit breaker for magnetic drive with a simple structure of the booster chamber. Another object of the present invention is to alleviate the electric field of the movable arc contact in the thermal puffer type gas circuit breaker combined with magnetic drive so that the high voltage of the gas circuit breaker can be easily dealt with.

[0007]

To achieve the above object, the present invention provides a fixed arc contact and a coil for magnetic drive in a boost chamber, and a fixed main contact is arranged outside the boost chamber, and the fixed arc contact is provided. In a magnetic drive combined thermal puffer type gas circuit breaker having a movable arc contact that contacts with a fixed main contact and a movable main contact that contacts the fixed main contact, a part of the booster chamber wall on the fixed contact side is made of a conductive material, Is made of an insulating material, the insulating material portion of the step-up chamber wall is located on the outer periphery of the coil, and the fixed main contact is attached to the conductive material portion of the step-up chamber wall. Thermal puffer type gas circuit breaker with magnetic drive.

[0008]

Since the pressure-increasing chamber wall on the outer periphery of the coil for magnetic drive is made of an insulating material, even if a magnetic field is generated by the coil when the current is interrupted by the gas circuit breaker, no current flows through the pressure-increasing chamber wall. Therefore, it is not necessary to provide an interrupt on the wall of the pressure increasing chamber or to fill the inside with an insulator, so that the structure of the pressure increasing chamber can be simplified.

Further, since the fixed main contact is attached at a position moved from the movable contact side to the fixed contact side, the tip of the movable main contact also has a structure extending to the fixed contact side. Therefore, since the movable main contact is arranged around the tip of the movable arc contact, the electric field of the movable arc contact is relaxed.

[0010]

EXAMPLE An example of a magnetic puffer type gas circuit breaker with magnetic drive according to the present invention will be described with reference to the drawings. FIG. 1 shows a closed state of the gas circuit breaker. Reference numeral 1 is a metal pressure chamber wall made of a conductive material, 2 is a nozzle, and 3 is an insulator pressure chamber wall. The metal pressure chamber wall 1 is arranged on the fixed contact side, and the nozzle 2 and the insulator pressure chamber wall 3 are arranged on the movable contact side to form a pressure chamber 4.

The nozzle 2 and the pressurizing chamber wall 3 made of an insulating material are made of an insulating material such as epoxy resin or fluororesin. In addition, the pressurizing chamber wall 3 made of an insulating material and the nozzle 2 may be integrated. Reference numeral 5 is a fixed arc contact arranged in the booster chamber 4. Reference numeral 6 denotes a coil arranged in the booster chamber 4, one end of which is electrically connected to the booster chamber wall 1 and the other end of which is connected to the arc runner 7. The upper end of the coil 6 is arranged below the joint between the metal pressure-raising chamber wall 1 and the insulator pressure-raising chamber wall 3, and the insulator 6 is pressure-insulated at a position close to the side surface of the coil 6. The chamber wall 3 comes to be arranged.

The fixed main contact 8 is a metal pressure chamber wall 1
Attached to. The fixed main contact 8 may be a tulip-shaped contact attached to the pressure-increasing chamber wall 1, or an interrupt may be inserted at the tip of the pressure-increasing chamber wall 1,
The contact may be given elasticity by being divided into a plurality of contacts. Reference numeral 9 is a movable arc contact, which enters the booster chamber 4 through the opening of the nozzle 2 when the gas circuit breaker is turned on, and then the fixed arc contact 5
Contact with. Reference numeral 10 denotes a movable main contact formed in a cylindrical shape, the outer periphery of which contacts the fixed main contact 8 when the gas circuit breaker is turned on.

When the current is cut off, the movable main contact 9 and the movable arc contact 10 are moved downward by an operating mechanism (not shown). First, fixed main contact 8
There is no arc between the movable main contact 10 and the movable main contact 10. Next, the fixed arc contact 5 and the movable arc contact 9 are opened, and an arc is generated between the two contacts 5, 9. When the movable arc contact 9 moves further downward, the arc moves from the fixed arc contact 5 to the arc runner 7,
The arc is generated between the movable arc contact 9 and the arc runner 7. By moving the arc to the arc runner 7,
A current flows through the coil 6 and a magnetic field intersecting the arc is generated.

The arc is rotationally driven by this magnetic field and rotationally moves at high speed in the gas space in the pressure raising chamber 4. As a result, gas is relatively blown to the arc to extinguish the arc. If the current is not interrupted by this magnetic drive, the arc continues further and the gas in the pressurizing chamber 4 is heated by the arc and the gas pressure rises. When the movable arc contact 9 moves further downward and its tip comes out of the opening of the nozzle 2, the gas whose pressure is increased in the pressure increasing chamber 4 is discharged from the opening of the nozzle 2 to the outside of the pressure increasing chamber 4 at high speed. This gas is blown to the arc to cut off the current due to the thermal puffer action.

During the shut-off operation of the gas circuit breaker described above, the magnetic field generated by the coil 6 is also generated on the pressure chamber wall side. However, since the pressure chamber wall 3 made of an insulating material is arranged near the coil 6, the pressure is increased. No electric current flows on the chamber wall. That is, there is no need to provide an interrupt or fill the interrupt with an insulator as in the conventional gas circuit breaker described above. Further, since the fixed main contact 8 is attached at the position moved from the movable contact side to the fixed contact side, the movable main contact 1
No. 0 has a structure in which its tip extends to the fixed contact side.

As a result, the tip of the cylindrical movable main contact 10 is arranged in a portion near the tip of the movable arc contact 9, so that the movable arc contact 9
The electric field at the tip of is relaxed. Therefore, it is possible to easily cope with the high voltage of the gas circuit breaker.

[0017]

According to the present invention, in the heat-puffer type gas circuit breaker combined with magnetic drive, the boosting chamber can have a simple structure. Moreover, the electric field of the movable arc contact can be relaxed, and the high voltage of the gas circuit breaker can be easily dealt with.

[Brief description of drawings]

FIG. 1 is a sectional view showing the configuration of an embodiment of a gas circuit breaker of the present invention.

FIG. 2 is a cross-sectional view showing the configuration of a conventional gas circuit breaker.

[Explanation of symbols]

 1 ... Metal pressure chamber wall 2 ... Nozzle 3 ... Insulator pressure chamber wall 4 ... Pressure chamber 5 ... Fixed arc contact 6 ... Coil 7 ... Arc runner 8 ... Fixed main contact 9 ... Movable arc contact 10 ... Movable main contact

Claims (1)

[Claims] 1. A fixed arc contact and a coil for magnetic drive are provided inside the boost chamber, a fixed main contact is arranged outside the boost chamber, and a movable arc contact that contacts the fixed arc contact and a movable contact that contacts the fixed main contact. In a magnetic puffer type gas circuit breaker with magnetic drive equipped with a main contact, the fixed contact side portion of the step-up chamber wall is made of a conductive material, and the movable contact side portion is made of an insulating material. A magnetic drive combined thermal puffer type gas circuit breaker, characterized in that the material portion is located on the outer circumference of the coil, and the fixed main contact is attached to the conductive material portion of the booster chamber wall.