JPS5856928B2 - Gas cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas breaker, particularly a gas breaker suitable for use in a generator main circuit.

The gas breaker uses SF6 gas or the like as an arc-extinguishing medium, and SF6 gas has a higher thermal conductivity than air and can provide a good heat dissipation effect.

However, in the case of the natural cooling method, there is a limit to the cooling efficiency due to space constraints and economical considerations.

By the way, a generator main circuit breaker or the like installed in the generator output section is required to conduct a large rated current at a relatively low rated voltage.

Therefore, for the generator main circuit breaker, etc., it is advisable to air-cool it using the forced cooling air of the phase separation bus for the reasons mentioned above.

A conventional gas breaker placed in a phase separation bus uses SF6 gas as an arc extinguishing medium, while air is used as a forced cooling medium for the phase separation bus.

For this reason, a gas breaker is usually called a tank-type gas breaker, which consists of a breaker section electrically insulated from the tank filled with SF6 gas, and placed inside the sheath of the phase separation bus. It had been.

In this structure, the forced cooling air from the phase separation bus only acts on the tank of the tank-type gas breaker.

The heat generation source was the current-carrying agent conductor, and there was SF6 gas between the conductor and the tank, resulting in low cooling efficiency.

From this explanation, it can be understood that in order to cool the gas breaker using the forced cooling air of the phase separation bus bar, the gas breaker should have a structure convenient for this cooling.

On the other hand, in order to improve the breaker performance, SF6 gas is used at a higher pressure than the normal pressure in the gas breaker.

In this case, in order to reduce the amount of high-pressure SF6 gas used, it is a good idea to use high-pressure SF6 gas for the breaker and relatively low-pressure SF6 gas for the ground insulation. .

To achieve this, a second sealed container may be provided within the tank, a cutoff portion may be provided within the second sealed container, and high pressure gas may be filled.

The internal configuration of the second sealed container at this time can be applied as the gas breaker for the generator main circuit in the above-mentioned 11th example.

Both gas circuit breakers have a first sealed container, such as a sheath or a tank, that houses the entirety of the gas circuit breaker, and a circuit breaker disposed inside the first sealed container is configured in a second sealed container filled with arc-extinguishing gas. The points are the same.

An object of the present invention is to provide a gas breaker with a simplified structure of a sealed container filled with an arc-extinguishing gas.

The present invention is characterized in that a sealed container is constructed using a breaker component.

Most of the outer wall of the sealed container is made up of members forming the main current-carrying part.

The present invention will be explained below with reference to embodiments shown in the drawings.

Incidentally, a buffer type is used as the breaker.

The puffer-shaped breaker unit 24 is arranged within the sheath 1 of the phase separation busbar, and is supported and electrically insulated from the sheath 1 by two insulating supports m25, 26.

This breaker unit 24 is connected to the bus conductor 2 in the sheath 1.
7.28 are connected in series.

The cylindrical conductors 2 and 4 fixed by the insulating support cylinders 25 and 26 are located on opposite sides at a predetermined distance apart, and the opposite sides are each sealed.

As will be explained later, the space between the two cylindrical conductors 2 and 4 is filled with SF6 gas and has a distance necessary to maintain interelectrode insulation.

Flange portions are formed at opposing ends of both cylindrical conductors 2 and 40, respectively, and an insulating tube 5 is airtightly connected between the flange portions.

In this way, both cylindrical conductors 2 and 4 and the insulating cylinder 5 form one sealed container.

Specifically, it is a sealed container including an insulating support tube 25 and a mechanism case 31, and the insulating support tube 26 may be removed from the sealed container.

Unlike the inside of the sheath 1, this sealed container is filled with an arc-extinguishing gas such as SF6 gas.

A fixed arcing contact 1 is located approximately on the central axis of the cylindrical conductor 4.
4 is provided, and this contactor 14 is electrically connected to the cylindrical conductor 4 and mechanically supported and fixed.

On the other hand, a piston 15 is fixed to the cylindrical conductor 2, and a movable portion of the breaker is supported by the piston 15.

The movable parts of the breaker section include a movable arcing contact 16 facing the fixed arcing contact 14, a central shaft 22, a cylinder 12, an insulating nozzle 16 surrounding the movable 1-king contact 16, and a movable main contact 32. It has a button and is connected to one end of the link device 3.

The other end of the link device 3 is an insulated operating rod 9 inside the insulated support tube 25.
It is connected to operating devices 29 and 30 via.

In this way, the movable part of the breaker is connected to the operating device 29.3.
It is opened and closed by 0.

The movable main contactor 32 is fixed to the cylinder 12 by, for example, a plate-shaped connecting body 23.

The contact body 23 connects the spaces on the left and right sides of the cylinder 12 so as not to create resistance to the movement of the cylinder 12, and also reduces the number of right angles arranged in the direction of movement.

Therefore, the connecting body 23 may be rod-shaped.

However, if the operating force is sufficiently large, the above considerations are not necessary.

This movable main contactor 32 is buttoned to the illustrated closed state to electrically connect both the cylindrical conductors 2 and 4.

In detail, the current collector 13 and the fixed main contact 33 are attached to the opposing ends of both cylindrical conductors 2 and 4, and the movable main contact 12 electrically opens and closes between the current collector 13 and the fixed main contact 33. The main contact device is made up of the main contact device.

The separation operation of the main contact device causes the movable main contact 12 to separate from the fixed main contact 33.

This opening is performed prior to the opening between both arcing contacts IL'14.

The movable main contact 12 separates from the fixed main contact 33 while maintaining connection with the current collector 13, and in the open state, the main contact 12
, 33 are separated by a distance necessary to maintain insulation between the poles.

On the other hand, opening between the arcing contacts 11, 14 generates an arc between them.

However, along with this opening operation, the gas in the chamber is compressed from the piston 15 and the cylinder 12, and the compressed gas is guided by the insulating nozzle 16 and sprayed in line with the arc to extinguish it.

By the way, in a phase separation bus bar through which a large current is passed, air is circulated as shown by the arrow for forced cooling.

This air enters the sheath 1 and cools the cylindrical conductors 2 and 4 forming the sealed container of the cutoff section, that is, the main current carrying section.

Since the main current-carrying part is directly cooled, the temperature rise is extremely low, similar to the bus conductors 27 and 28 of the phase-separated bus bar.

Moreover, since the cooling air and the arc-extinguishing medium are separated by sealing the cylindrical conductors 2 and 4 forming the main current-carrying part with the insulating cylinder 5, the sealed container can be constructed by utilizing the necessary components. Can be configured.

Although the insulating tube 5 mechanically fixes the opposing ends of both cylindrical conductors 2 and 4, it is not possible to support both cylindrical conductors 2 and 4 with only the insulating support fd25.26). 5 simply constitutes a sealed container.

If the cylindrical conductor 4 is fixed by the bus conductor 28 of the phase-separated bus bar, the insulating support tube 26 can be removed,
Furthermore, an insulator or the like may be used instead of the insulating support cylinder 26.

In this way, the sealed container can take on a variety of configurations.

Particularly in the illustrated embodiment, both ends of the sealed container in the axial direction are sealed by end plates 34 and 35, and the link device 3 is supported by the end plate 35. It is also possible to lead the rotating shaft out of the cylindrical conductor 2 in an airtight manner and connect it to the insulated operating rod 9 outside the cylindrical conductor 2.

Furthermore, the link device 3 can be configured so that the breaker section is opened by pulling the insulated operating rod 9.

In another embodiment, the sheath 1 may be manufactured as a tank as a sealed container, and this tank may also be filled with SF6 gas to serve as a gas breaker.

This type of gas breaker guarantees the pressure of SF6 gas necessary for insulation between the tank and the current-carrying conductor, the arc extinguishing performance button, and the subsequent insulation maintenance.

The pressure of the gas can be conveniently selected separately.

This is particularly effective for gas circuit breakers in which the latter gas pressure is higher than the former.

Furthermore, the present invention can be applied not only to those using a buffer-type breaker.

Furthermore, even when a buffer-type breaker is used, the movable main contact 32 may also be used as the cylinder 12.

As explained above, the present invention provides two cylindrical conductors forming the main current-carrying part, which are provided at a predetermined distance apart, and which are connected by a movable main contact fixed to the outer periphery of the buffer cylinder. Since an insulator is provided to airtightly seal the column-aligned portion between both cylindrical conductors on the outer periphery of the main contact, a sealed container can be easily constructed using the constituent members necessary to form the main current-carrying part. Can be done.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of a gas breaker according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Sheath, 2, 4... Cylindrical conductor, 5... Insulating tube, 11... Movable arcing contact, 14... Fixed arcing contact, 27, 28... Bus bar conductor, 32
...Movable main contact, 33...Fixed main contact.

Claims (1)

[Claims] 1. In a sealed container filled with insulating gas, 1 that can be opened.
a pair of arcing contact devices; a main contact device for energization that is located on the outer periphery of the arcing contact device and opens prior to the opening of the arcing contact device; and a buffer cylinder that compresses the gas. 1, with the opposite ends sealed and a predetermined distance separated between the opposite ends.
A pair of cylindrical conductors are provided almost coaxially, and the opposing ends of the cylindrical conductors are hermetically connected by an insulating tube to form the sealed container, and the buffer cylinder has an outer periphery of the buffer cylinder. A gas cutoff characterized in that a movable main contact that separably bridges the inside of a row of shaped conductors is connected, and the movable main contact and the above-mentioned both cylindrical conductors constitute the above-mentioned current-carrying main contact device. vessel. 2. The gas breaker according to claim 1, wherein the movable main contact is connected to the movable arcing contact by a connecting body that communicates the spaces within both the cylindrical conductors.