JPH077626B2 - Puffer type gas pipe and disconnector - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to improvements in a buffer type gas breaker and a circuit breaker.

[Technical background of the invention and its problems]

High-pressure gas circuit breakers that blow an arc-extinguishing gas such as SF ₆ into the arc are widely used because they easily withstand high voltages. Above all, the buffer type gas circuit breaker that compresses the arc-extinguishing gas by utilizing the driving force when the contacts are opened is the mainstream of the high voltage circuit breaker because of its simple structure.

Since the buffer type gas circuit breaker creates a compressed gas with the opening operation, it is not necessary to always hold the high pressure gas unlike the two-pressure type circuit breaker. However, on the other hand, in the buffer type, it is necessary to drive the buffer cylinder against the pressure difference between the compressed gas and the ambient gas pressure. This differential pressure is related to the current interruption capability of the buffer type gas circuit breaker. That is, when the breaking current also becomes large, the current decrease rate at the current zero point becomes large, and as a result, a gas having a higher pressure is required, and a large driving energy is required together with the current.

The drive energy of the pattern type gas burner and disconnector is 2
It consists of two components. One is kinetic energy for opening the whole at a constant speed, and the other is gas energy for gas compression. The latter has a large dependence on the breaking current, whereas the former has a high dependence on the voltage. That is, the higher the voltage, the higher the voltage applied between the contacts. For this reason, it is necessary to increase the contact opening speed and increase the gear length in accordance with the voltage, for example, in the case of advance small current interruption, and the kinetic energy increases accordingly.

The increase in driving energy not only leads to an increase in the size of the driving part but also increases the cost, but also increases the mechanical stress on each part of the movable part and impairs the long-term life. In addition, the acceleration to the base also increases, and it becomes necessary to make the foundation stronger.

Reducing the driving energy in this way is a very important technical issue.

Several types of buffer type gas breakers and circuit breakers have been proposed for the purpose of reducing this type of driving energy.

A typical example is the buffer type gas breaker and breaker described in JP-A-58-108624. This buffer type gas breaker and circuit breaker is provided with a storage pressure chamber in addition to the buffer chamber, and the arc energy is stored therein to reduce the driving energy.

However, when the gas is blown to the arc generated at the time of this puffer type gas breaker, breaker breaker, or break, the timing is not particularly considered. Therefore, it is considered that the driving energy can be further reduced by considering the timing of blowing the gas to the arc.

[Object of the Invention]

The present invention has been made in view of the above points, and an object of the present invention is to provide a buffer type gas circuit breaker in which drive energy is minimized.

[Outline of Invention]

In order to achieve the above-mentioned object, the present invention is characterized in that, in a buffer type gas breaker or a breaker having a storage pressure chamber in addition to the buffer chamber, a hole is provided to connect the storage pressure chamber and the buffer chamber. To do. Further, this hole is characterized in that it is closed in the middle of the opening of the breaker or the disconnector. Further, it is characterized in that the hole is closed from this point and the hole is opened again just before the opening of the disconnector is completed.

Example of Invention

The present invention will be described based on the embodiment shown in FIG. FIG. 1 shows a cross section in the vicinity of an arc extinguishing chamber of a buffer type gas circuit breaker. This arc-extinguishing chamber is held in a container filled with SF ₆ gas, etc. via an insulator.

The arc-extinguishing chamber is a pair of fixed arc contacts 1 facing each other and freely separated.
And a movable arc contactor 2. Movable arc contactor 2
Is fixed to the operating rod 6, but the operating rod 6 is connected to a drive unit (not shown). The operation rod 6 includes a second nozzle 10a so as to include the periphery of the movable arc contactor 2.
And the enclosure 10b are fixed. Second nozzle 10a and enclosure
The storage pressure chamber 11 is constituted by the movable arc contactor 2 and 10b. The connecting portion between the enclosure 10b and the second nozzle 10a has a flange on the outside, and the buffer cylinder 4 is coaxially attached to the enclosure 10b and the operating rod 6 on this flange. On the front surface of the buffer cylinder 4, a first nozzle 3 that forms a gas flow path with the second nozzle 10a and has an opening at the tip is fixed by a nozzle retainer 9. The nozzle retainer 9 engages with the fixed energizing contact 7 to form a main energizing path. The buffer cylinder 4 is slidably inserted into a buffer piston 5 fixed to the container. The buffer piston 5 is electrically connected to the buffer cylinder 4 via a current collector 8.

The tip 51 of the inner surface of the buffer piston 5 has a diameter that slides on the enclosure 10b, and a rear end thereof is provided with a plurality of grooves 12 in the circumferential direction, as shown in FIG.

In the middle of the opening phase, an enclosure is formed on the inner surface tip portion 51 of the buffer piston 5.
10b is inserted. The enclosure 10b is provided with a plurality of holes 13 in the circumferential direction at the connecting portion with the operation rod 6. At the end of opening, the hole 13 and the groove 12 engage with each other. Next, the operation of the present invention configured as described above will be described.

When the contacts are closed, the fixed arc contact 1, the movable arc contact 2, the fixed energization contact 7 and the nozzle retainer 9 are in electrical contact. The drive unit operates in accordance with the contact opening command, and the operation rod 6 moves in the contact opening direction (rightward in FIG. 1). First, the nozzle retainer 9 separates from the fixed energizing contact 7, and then the movable arc contact 2 separates from the fixed arc contact 1 to generate an arc. As a result, the gas in the storage pressure chamber 11 composed of the second nozzle 10a, the enclosure 10b, and the movable arc contactor 2 is heated and compressed.

On the other hand, the gas in the buffer chamber is compressed by the relative movement of the buffer cylinder 4 and the buffer piston 5. At the initial stage of contact opening, holes 13 provided in the enclosure 10b allow communication between the buffer chamber and the storage pressure chamber 11. When the opening is in the middle stage, the hole 13 of the enclosure 10b is cut by the inner wall 51 of the buffer piston 5. Further, in the latter stage of opening, the hole 13 of the enclosure 10b reaches the groove 12 on the inner wall of the piston 5, and the buffer piston 5 and the enclosure
The gas compressed by the relative motion of 10b is communicated with the storage pressure chamber 11.

〔The invention's effect〕

As described above, according to the present invention, the enclosure is provided around the movable arc contactor, and the buffer cylinder is provided outside the enclosure to make the storage pressure chamber and the buffer chamber communicate with each other, thereby speeding up the pressure increase in the buffer chamber. In the mid-opening period, the storage pressure chamber is not communicated with the buffer chamber, but by separating the buffer chamber into two, the reaction force can be suppressed as low as possible, and finally between the enclosure and the buffer piston. It is possible to effectively use the pressure increase due to the arc energy by guiding the compressed gas of (1) to the storage pressure chamber and to cut off with a small amount of operating energy without increasing the reaction force.

[Brief description of drawings]

FIG. 1 is a sectional view of an arc extinguishing chamber of a buffer type gas circuit breaker according to the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. DESCRIPTION OF SYMBOLS 1 ... Fixed arc contactor, 2 ... Movable arc contactor 3 ... Nozzle, 4 ... Puffer cylinder 5 ... Puffer piston, 6 ... Operation rod 7 ... Fixed energizing contactor, 8 ... Current collector 9 ... Nozzle retainer, 10a, 10b ... Siege

Claims (3)

[Claims] 1. A fluid in a buffer chamber compressed according to the movement of the movable arc contact is jetted from a first nozzle to an arc generated when the fixed arc contact and the movable arc contact are separated from each other. The storage pressure chamber communicating with the second nozzle on the side closer to the movable arc contact than the first nozzle is driven by the movable arc contact, and the high temperature is generated by the arc when the movable arc contact is opened. The fluid whose pressure has been increased is mixed with the fluid in the storage pressure chamber through the second nozzle and stored therein, and the fluid in the buffer chamber is jetted from the first nozzle to the arc, and the movable arc contactor After moving a predetermined distance, the fluid from the storage pressure chamber is ejected from the second nozzle into the arc together with the ejection from the first nozzle. Te, wherein a hole for communicating the reservoir pressure chamber and the Patsufua chamber and Patsufua type gas, characterized in that in the wall of the reservoir pressure chamber and the cross-sectional unit. 2. The buffer type gas shield according to claim 1, wherein the hole is closed by a buffer piston constituting the buffer chamber from the middle of opening the contact or the disconnector. Broken. 3. The hole according to claim 2, wherein the hole is opened again immediately before the completion of the opening of the breaker or the breaker, and the storage pressure chamber and the buffer chamber are communicated with each other again. The described packing type gas pipe and disconnector.