JPH1125819A - Magnetically driven thermal buffer type gas circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a function for completely separating an electric circuit from a circuit breaker itself from voltage point of view in a magnetically driven thermal buffer type gas circuit breaker. SOLUTION: In a magnetically driven thermal buffer type gas circuit breaker compatible with a magnetic driving effect and a thermal buffer effect, and electrode 1 on a fixed contact side and an electrode 2 on a movable contact side respectively are supported at a grounding potential part 17 by means of another insulation support based 15 and 16. Thereby, since a solid insulator does not exist, and a gas insulator exists between both electrodes, even if a power voltage is applied, a charge current does not flow between the electrodes through the gas insulator. Therefore, there can be completely separated between the electrodes by only a circuit breaker, and there is no need for providing the circuit breaker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetically driven heat-puffer type gas circuit breaker which is a power circuit breaker.

[0002]

2. Description of the Related Art A magnetically driven heat-puffer type gas circuit breaker which combines an arc-extinguishing effect by a magnetic driving effect and an arc-extinguishing effect by a thermal puffer effect has a conventional mechanical gas compression mechanism and has excellent shut-off performance. Compared to a puffer type gas circuit breaker, it has been dramatically reduced in size. In the following description, the “magnetic pneumatically driven thermal puffer type gas circuit breaker” may be simply referred to as a “circuit breaker”.

FIG. 1 shows a configuration example of a conventional thermal puffer type gas circuit breaker combined with magnetic drive. In FIG. 1, reference numeral 1 denotes an upper electrode, 2 denotes a lower electrode, 3 denotes an insulating tube disposed between the upper electrode 1 and the lower electrode 2, and 4 denotes an insulating tube attached to the lower electrode 2 and supporting a cutoff portion. is there. SF6 gas is sealed inside the gas circuit breaker. A boosting chamber 5 is attached to the upper electrode 1, and a fixed arc contact 6, a coil 7, and an arc runner 20 are arranged in the boosting chamber 5. A fixed main contact 8 is arranged outside the boosting chamber 5.

The movable arc contact 9 and the movable main contact 1 which come into contact with or are separated from the fixed arc contact 6 and the fixed main contact 8.
0 is integrally formed and attached to the insulating operation rod 11. The lower electrode 2 has a sliding contact 12 through which the movable arc contact 9 and the movable main contact 1
0 is electrically connected.

[0005]

The above-mentioned thermal puffer type gas circuit breaker combined with magnetic drive has a small size and a high performance, and is therefore suitable for use in a gas insulated switchgear (hereinafter referred to as "GIS"). It is a vessel. This GIS is a device in which a device such as a circuit breaker and other switches is housed in a metal container filled with SF6 gas. Compared to existing open-type power receiving and transforming equipment that combines single devices. In addition, the epoch-making equipment reduction is realized. However, in recent years, GIS has been required to be further reduced in size and cost, and a gas circuit breaker, which is a main device thereof, has also been required.

Then, as a result of studying the configuration of the thermal puffer type gas circuit breaker combined with magnetic drive, the following points were found. The insulating cylinder 3 between the upper electrode 1 and the lower electrode 2 is formed by integrally molding epoxy resin or the like, and is relatively expensive. Since the solid insulator has a higher dielectric constant, when a power supply voltage is applied to the upper electrode 1, a charging current flows between the electrodes 1 and 2. Therefore, in the conventional circuit breaker, even when the circuit breaker is turned off, the electric circuit cannot be completely disconnected in terms of voltage. Therefore, a disconnector is required in series with the circuit breaker for voltage disconnection.

[0007] Depending on the use conditions, this disconnector may not be able to open and close the exciting current or the charging current, but may have a current of several thousand amps, such as a loop current.
Is required to cut off the current. In order to have such a duty of interrupting the current, measures such as adding a device for mechanically blowing an insulating gas such as a suction puffer are taken. Such a disconnector has a complicated and large-sized mechanism and requires a large operating force to operate the disconnector, so that the operating mechanism of the disconnector also increases in size.

On the other hand, if the thermal puffer type gas circuit breaker combined with magnetic drive can completely cut off the electric circuit in terms of voltage,
It is also possible to omit the disconnector, like GIS,
The whole apparatus using the circuit breaker can be reduced in size and cost. An object of the present invention is to provide a heat-puffer-type gas circuit breaker combined with a magnetic drive, in which the price is reduced by eliminating the insulating cylinder of the breaker, and the circuit breaker itself has a function of completely disconnecting an electric circuit in terms of voltage. It is.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. In the present invention,
A magnetic drive effect in which the arc generated at the time of current interruption is rotated by magnetic force to extinguish the arc, and a heat buffer that extinguishes the arc by accumulating the gas expanded by the arc energy and blowing the gas to the arc with the accumulated pressure. In the magnetically driven thermal puffer type gas circuit breaker combined with the effect,
The electrode on the fixed contact side and the electrode on the movable contact side are supported on the ground potential portion by separate insulating support bases or insulating support bases which can be regarded as equivalently individually supported with respect to the ground potential, and the insulating cylinder 3 is eliminated. .

[0010] Thus, there is no solid insulator directly connected between the electrode on the fixed contact side and the electrode on the movable contact side, and a gas insulator such as SF6 gas exists. Since a gas insulator has a much lower dielectric constant than a solid insulator, no charging current flows between electrodes through the gas insulator even when a power supply voltage is applied. That is, according to the thermal puffer-type gas circuit breaker combined with magnetic drive of the present invention, the voltage can be completely separated between the electrodes by only the circuit breaker. Therefore, there is no need to connect a disconnector for disconnecting the electric circuit in terms of voltage in series with the circuit breaker. Also,
By eliminating the need for a disconnector, the entire device incorporating the circuit breaker can be reduced in size and cost.

When the circuit breaker is in the cut-off state, a charging current flows from the electrode to which the power supply voltage is applied to the ground through an insulating support made of a solid insulator. However, since this charging current does not flow to the other electrode, the electrodes of the circuit breaker are completely disconnected in terms of voltage. Also, the insulating support supporting each electrode does not need to be directly supported by the ground potential portion, and there may be other inclusions between the ground potential portion and the insulating support. In short, it is sufficient that the electrodes are not directly connected by a solid insulator.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows the thermal puffer type gas circuit breaker combined with magnetic drive housed in the GIS. In the figure, 1 is an upper electrode and 2 is a lower electrode. The upper electrode 1 is attached to the GIS container 17 at the ground potential by the first insulating support 15 and the lower electrode 2 is attached to the second insulating support 16 by the second insulating support 16. In the GIS container 17, SF of insulating gas is provided.
Six gases are sealed.

A boosting chamber 5 is mounted on the upper electrode 1, in which a fixed contact 13, a coil 7, and an arc runner 20 are arranged. Although not shown, the upper electrode 1 is formed with a portion for connecting the circuit breaker to another device. The lower electrode 2 has a movable contact 14 at the center.
Has an opening through which a sliding contact 12 is provided. The movable contact 14 is arranged so as to make sliding contact with the sliding contact 12. Insulating operation rod 1 on movable contact 14
The insulating operating rod 11 is driven in the vertical direction in the figure by an operating mechanism (not shown). Further, the lower electrode 2 has a shield 1 for alleviating the electric field of the cutoff portion.
8 are provided. Although not shown, the lower electrode 2
Is formed with a portion for connecting the circuit breaker and other devices.

FIG. 2 shows a cut-off state of the circuit breaker, in which the fixed contact 13 and the movable contact 14 are separated. In this state, the power supply voltage is applied between the upper electrode 1 and the lower electrode 2, but no charging current flows between the two electrodes 1 and 2 because only SF6 gas is interposed. Therefore, the voltage between the two electrodes 1 and 2 is completely cut off. Thereby, the disconnector connected in series with the circuit breaker can be omitted.

Although the electrodes 1 and 2 are supported by insulating supports 15 and 16 which are solid insulators, the charging current flowing here only flows to the ground side.
It does not flow between the two. Therefore, conventionally, it was necessary to provide a disconnector in series with the circuit breaker in order to disconnect the electric circuit in terms of voltage, but a circuit breaker that does not require this disconnector can be provided. Also, by omitting the disconnector, the number of devices housed in the GIS can be reduced,
Can be reduced in size and cost.

When the circuit breaker is closed from the shut-off state shown in the figure, the insulating operating rod 11 is driven upward by the operating mechanism (not shown), and the movable contact 14 enters the pressurizing chamber 5 through the nozzle 19 and is fixed. It comes into contact with the contact 13. When the circuit breaker is shut off from the closed state, the insulating operating rod 11 is rapidly moved downward in the figure by an operating mechanism (not shown). Then, the movable contact 14 is separated from the fixed contact 13, and an arc is generated between the contacts 13 and 14.

When the movable contact 14 moves further downward,
The arc moves from the fixed contact 13 to the arc runner 20 provided on the coil 7. Then, a current flows through the coil 7 and the arc is magnetically driven. As a result, the arc rotates at a high speed in the gas atmosphere, and the gas is relatively blown to the arc, so that the arc is extinguished by the magnetic driving effect.

The arc rotates at high speed in the pressurizing chamber 5 to expand the surrounding SF6 gas by heat. Since the nozzle 19 of the pressurizing chamber 5 is closed by the movable contact 14, the expanded gas is stored in the pressurizing chamber 5. When the movable contact 14 moves further downward and its tip comes off the nozzle 19 of the pressurizing chamber 5, the high-pressure gas stored in the pressurizing chamber 5 is discharged from the nozzle 19 to the outside of the pressurizing chamber 5. Since the gas discharged to the outside of the boosting chamber 5 is blown against the arc, an arc extinguishing effect of the arc occurs due to the thermal puffer effect.

As described above, in the circuit breaker shown in FIG. 2, the arc generated between the contacts 13 and 14 at the time of the breaking operation receives both the arc-extinguishing effect by the magnetic driving effect and the arc-extinguishing effect by the thermal puffer effect. Is extinguished. The arc extinguishing effect by the thermal puffer effect is controlled by the nozzle 19 when the gas is released from the pressurizing chamber 5, and the arc is blown with the insulating gas. Since it is not surrounded by an insulating cylinder like a vessel, it is discharged to a wider space. Therefore, the speed of the released gas is increased, and the arc extinguishing action is performed by the higher thermal puffer effect.

According to the thermal puffer type gas circuit breaker combined with magnetic drive described above, since a cylinder and a piston for compressing the gas are not required, the operating force required for closing and closing the circuit breaker is small. Further, since this circuit breaker is small, it can be used not only as a circuit breaker but also as a disconnecting switch requiring current switching capability.

FIG. 3 shows a different embodiment of the present invention.
In this example, a main contact for supplying a large current is provided to a heat-puffer type gas circuit breaker combined with a magnetic drive, and in other respects, it has substantially the same configuration as that of FIG. 2 described above. Have the same functions and effects. Therefore, in the present example, only the portions different from those in FIG. 2 will be described, and redundant description will be omitted.

The upper electrode 1 is provided with a fixed main contact 8 outside the boosting chamber 5 in addition to the configuration shown in FIG. The lower electrode 2 is formed in a cylindrical shape. For this reason, the lower electrode 2
Since the shape itself has a shielding effect, the shield 18 provided in the circuit breaker in FIG. 2 is not required. A sliding contact 12 is provided on the inner periphery of the lower electrode 2. This sliding contact 1
The movable main contact 10 slidably in contact with 2 is formed in a cylindrical shape, and supports the movable arc contact 9 at the center thereof. These movable contacts 9 and 10 are formed as one body and attached to the insulating operation rod 11.

In the closed state of the circuit breaker, the movable main contact 10 comes into contact with the fixed main contact 8 and the fixed arc contact 6
, The movable arc contact 9 contacts. The current flowing when the circuit breaker is turned on flows exclusively through the fixed main contact 8 and the movable main contact 10. During the breaking operation of the breaker, the insulating operation rod 11
Is moved downward, so that the movable main contact 10
First detaches from the fixed main contact 8, and then the movable arc contact 9 separates from the fixed arc contact 6. At this time, when the movable main contact 9 is separated from the fixed main contact 8, the current is transferred to the movable arc contact 9 and the fixed arc contact 6 side, and the electric current flows between the movable main contact 9 and the fixed main contact 8. No arc is generated. As described above, the fixed main contact 8 and the movable main contact 9 do not need to be arc resistant, and need only have the function of energization.

Thereafter, when the insulating operation rod 11 is further moved downward, the movable arc contact 9 separates from the fixed arc contact 6 and an arc is generated between the contacts 6 and 9. The arc extinguishing action for this arc is performed in the same manner as in the example of FIG. FIG. 4 shows an example in which the upper electrode and the lower electrode are supported by one insulating support. FIG. 4 has substantially the same configuration as that of FIG. 3 except for the configuration of the insulating support, and has the same operation and effect. Therefore, in the present example, only the portions different from those in FIG. 3 will be described, and redundant description will be omitted.

The insulating support 21 includes a base 22 and a base 22.
A first support portion 23 extending diagonally upward from the first portion and a second support portion 24 extending diagonally downward from the base portion 22 are integrally formed. The first support 23 supports the upper electrode 1 and the second
Supports the lower electrode 2. Insulating support 21
Is attached to the GIS container 17 at the ground potential at the base 22.

In the example shown in FIGS. 2 and 3 described above, the upper electrode 1 and the lower electrode 2 are attached to the GIS container 17 by separate insulating supports 15 and 16. For this reason, it is necessary to adjust the shut-off portion in a state where it is attached to the GIS container 17. On the other hand, in this example, the upper electrode 1 and the lower electrode 2
Are supported by one insulating support 21. Therefore, the assembling and adjusting of the interrupting portion can be performed with the interrupting portion attached to the insulating support base 21 and then attached to the GIS container 17, so that the assembling and adjusting work can be facilitated.

Although the insulating support 21 shown in FIG. 3 structurally connects the upper electrode 1 and the lower electrode 2, the base 22 in the middle is attached to the ground potential part (the GIS container 17). Therefore, the upper electrode 1 and the lower electrode 2
Equivalently, it can be considered that it is individually supported by the ground potential portion. Therefore, no charging current flows between the two electrodes 1 and 2, so that the disconnector connected in series with the circuit breaker can be omitted in the example shown in FIG.

In the embodiment described above, the heat-puffer type gas circuit breaker combined with magnetic drive has been described as being housed in the GIS. However, this circuit breaker can also be used as a single unit, It can be used by being incorporated in another device.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a conventional thermal puffer type gas circuit breaker combined with magnetic drive.

FIG. 2 is a cross-sectional view showing a first configuration example of a magnetic puffer-use thermal puffer type gas circuit breaker to which the present invention is applied.

FIG. 3 is a cross-sectional view showing a second configuration example of a magnetic puffer-use thermal puffer type gas circuit breaker to which the present invention is applied.

FIG. 4 is a cross-sectional view showing a third example of the configuration of a thermal puffer type gas circuit breaker combined with magnetic drive to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Upper electrode 2 ... Lower electrode 3, 4 ... Insulation cylinder 5 ... Boost chamber 6 ... Fixed arc contact 7 ... Coil 8 ... Fixed main contact 9 ... Movable arc contact 10 ... Movable main contact 11 ... Insulation operation rod DESCRIPTION OF SYMBOLS 12 ... Sliding contact 13 ... Fixed contact 14 ... Movable contact 15,16 ... Insulating support 17 ... Ground potential part 18 ... Shield 19 ... Nozzle 20 ... Arc runner 21 ... Insulating support 22 ... Base 23,24 ... Support Department

Claims (1)

[Claims] 1. An arc generated when a current is interrupted is magnetically driven to rotate an arc by a magnetic force to extinguish the arc, and a gas expanded by an arc energy is accumulated, and a gas is blown to the arc by the accumulated pressure to generate an arc. Magnetic drive combined thermal puffer type gas circuit breaker combined with magnetic puffer effect with arc extinguishing effect. Magnetic drive effect member and thermal puffer effect member are integrally arranged on fixed contact side electrode and movable with fixed contact side electrode. The electrode on the contact side is supported on the ground potential portion by an insulating support stand that can be regarded as equivalently individually supported with respect to another insulating support stand or the ground potential part, and the fixed contact side electrode and the movable contact side are supported. Wherein the electrodes are not directly connected by a solid insulator.