JPS5856924B2 - Fluid spray type sheath disconnector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid spray type circuit breaker, and particularly to a circuit breaker that exhibits good spray at the initial stage of contact opening.

A self-compression type (buffer type) gas breaker, which is a typical example of a fluid spray type breaker, will be used for explanation.

A typical example of a conventional buffer type gas breaker is shown in FIG.

FIG. 1 shows a state in the middle of a cutoff operation, when the button is pressed, gas compressed in the buffer chamber 4 is drawn into the arc 3 generated between the fixed side arc contact 1 and the movable side arc contact 2, and the buffer cylinder shaft 5 Gas flow (movable side gas flow 7) toward the hollow part (shaft inner space 6), gas flow 9 towards the hollow part (fixed side hollow part 8) of the fixed side arc contact 1, and the fixed side arc contact The current is cut off by blowing a gas flow 10 to the outer circumference of the tube.

The stationary arc contact 1 is provided with an exhaust port 11 for discharging the stationary hollow gas flow 9 into the interior space of the container.

An exhaust port 12 is also provided on the cylinder shaft 5,
The structure is such that the movable side gas flow 7 is discharged into the internal space of the container.

FIG. 2 shows the state at the beginning of the breaker operation, immediately after the arc contactor is opened, and at this point an arc is generated with an instantaneous current value of several thousand to several amperes.

In this situation, for example, if the fault current is 30 and the fault current is 3mS before the zero point, the current instantaneous value reaches 38, and as shown in the figure, the arc is connected to the fixed side and the hollow of the movable arc contact. Part 6,
8 is completely blocked.

Conventionally, in the situation shown in FIG. 2, the gas flow is caused by the gas flow 7 on the movable side and the gas flow 10 into the hollow part 8 on the stationary side, so that the arc is placed at the central axis position of both arc contacts, and each The arc was extinguished by the axial gas flow into the arc contact hollow parts 6 and 8.

However, as shown in Figure 2, immediately after the contact is opened, the pressure rise in the buffer chamber is small, so no other gas flow is generated that blows through the arc, and the current zero point occurs immediately after this state. However, it was difficult to cut off the current.

Therefore, it is difficult to shorten the arc time, and the arc contacts 1, 2, insulator nozzle 13, insulator cover 14
It had the disadvantage that it consumed a lot of water.

An object of the present invention is to provide a fluid-sprayed breaker with a short arcing time by improving the gas flow at the button immediately after the arc contact is released and effectively blowing gas to the arc. .

The present invention creates a gas flow that flows through the hollow parts of the hollow arc contacts on the fixed side and the movable side through the opposing contact parts, so that the central part of the arc column immediately after the arc contacts are separated. Gas is sprayed onto both sides of the outer periphery to quickly extinguish the arc and restore the insulation between the arc contacts.

FIG. 3 shows an embodiment of the present invention, and shows the state immediately after the arc contact is separated after the start of the breaker operation.

The current flows from the upper terminal 15 through the fixed arc contact 1, the arc 3, the movable arc contact 2, the buffer cylinder shaft 5, the current collector contact 16, and the suction chamber sill 26.
, which flows to the lower terminal 17.

The operation of this embodiment is such that when the insulating material operating rod 18 is pulled downward in the figure by an operating device (not shown), the buffer cylinder shaft 5 connected by the pin 19 and the suction chamber piston 27 integrally formed therewith, buffer cylinder 2
0, move the insulator nozzle 13 downward.

As a result, the gas in the buffer chamber 4 is compressed, and
At the same time, the suction chamber cylinder 26 and the suction chamber piston 2
The suction chamber 28 formed by 7 is expanded.

Thereby, due to the pressure difference between the pressure increase in the buffer chamber and the pressure drop in the suction chamber, a strong gas is blown onto the arc generated between the arc contacts, thereby cutting off the current.

In particular, immediately after the arc contact is disconnected, the pressure increase in the buffer chamber is small, but the pressure drop in the suction chamber becomes large.

Therefore, all the gas flows in the direction of blowing into the suction chamber, and as shown in the figure, the gas flow 7 crosses the arc 3 from the buffer chamber 4 and passes through the hollow part 8 of the stationary arc contact 1. A gas flow 29 is generated from the interior of the container towards the suction chamber.

FIG. 4 shows the details of the vicinity of the contact and describes the relationship between the gas flow state and the arc.

The exhaust port 11 provided in the fixed side arc contact 1 always communicates with the suction chamber 28 through the buffer sill shaft inner space 6 and is turned on, and at the same time as the cutoff operation starts, a gas flow 29 is generated and the arc contact opens. At one point in time, the gas flow is already 29
exists.

In such a situation, when the cylindrical arc contacts 1 and 2 are separated, the arc 3 is generated from the contact portion, so that the arc assumes a hollow cylindrical shape immediately after the separation.

A gas flow 29 exists at the center of this cylindrical arc, and a gas flow γ exists at the outer periphery of the arc.

When this state is viewed in the cross section taken along line A-A' in FIG. 4, it becomes as shown in FIG.

There are gas flows 7, 29 in the center and outer circumference of the cylindrical arc 3 toward the plane of the paper.

In this way, the presence of gas flow on the inner and outer surfaces of the cylindrical arc immediately after the arc contact breaks off increases the arc extinguishing ability immediately after the arc contact breaks, and also replenishes fresh gas from the space inside the container. This has the effect of significantly improving the insulation recovery characteristics after interruption, and it becomes possible to interrupt a large current with a short distance between poles and a short arc time, which was previously impossible.

FIG. 6 shows a case where the arc time is long, and the fixed side arc contactor 1 has completely pulled out the insulator nozzle 13.

As shown in this figure, as time passes and arc 3 becomes longer after the arc contact is separated, the arc cannot maintain the cylindrical state shown in Figure 4, and due to the pinch effect, the center of the arc contact Concentrate near the axis.

1 - Therefore, there is no gas flow blowing through the arc center, and the gas flow is from the buffer chamber to the hollow part 8 of the fixed arc contact 1 in the axial direction of the arc outer circumference, as shown in the figure. The arc is extinguished by a gas flow 10 toward the outer circumference and a gas flow 7 flowing through the hollow part of the movable arc contact 2 into the suction chamber.

If the arc contact separation distance is large as shown in Figure 6,
If the pressure in the buffer chamber is sufficiently high, and the insulation recovers quickly after the current is cut off, the breaking ability is sufficient even without the gas flow flowing through the center of the cylindrical arc, as shown in Figure 4. Thick.

As explained above, according to this embodiment, it is possible to cut off a large current in a short arc time.

The effect will be explained using FIG. 7. In conventional buffer-type gas circuit breakers, when the arc contactor opens at the current phase a-a', it is difficult to break the current at zero point A, and it is difficult to break it at the next zero point B. It was possible.

However, according to the present invention, even when the open phase is c-c', the current can be reliably cut off at the current zero point A.

In particular, when the rate of rise in the re-electromotive voltage of the current breaker is low, it is possible to interrupt the circuit breaker at the current zero point A even in the open phase dd'.

Thereby, a buffer type gas breaker with an arc time of 0.2 to 0.7 cycles can be provided.

As described above, according to this embodiment, a gas flow exists inside and around the cylindrical arc generated between the arc contacts immediately after the arc contacts break, and the arc extinguishing ability is reduced. It is possible to provide a fluid spray type breaker with increased arc time and short arc time.

The buffer type gas breaker has been described above in which one of the arc contacts is movable, but the present invention
Other examples include, for example, an arc structure in which a pair of arc contacts are fixedly arranged facing each other at a fixed interval, and in the closed state of the breaker, both of these rotating contacts are bridged by a cylindrical movable contact. It can also be applied to a type of buffer type gas breaker that has a contactor.

Although a detailed explanation has been given above using a buffer type gas breaker as an example, the present invention is not limited to a buffer type gas breaker or breaker, but is applicable to fluid (including gas buttons and liquid) spray type breaker. A pair of arc contacts through which a fluid flows, and a suction chamber in which the fluid flows from the hollow part of one arc contact to the hollow part of the other arc contact. The invention generally includes a fluid spraying device that forms a fluid that flows from the contact separation part to the hollow parts of both arc contacts.

The effect of the present invention is that the current can be cut off in a short arc time by spraying an effective fluid on the arc immediately after the arc contact breaks off.
It is possible to extend the life of materials exposed to arc heat, and it is possible to realize labor savings in the maintenance and inspection of circuit breakers.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view for explaining the prior art, FIG. 2 is a partially enlarged view for explaining the prior art in detail in FIG.
4 is a partially enlarged view for explaining the third invention in detail; FIG. 5 is a plan sectional view of FIG. 4; 6 is a partially enlarged vertical sectional view for explaining the present invention in detail as shown in FIG. 3, and FIG. 7 is a route map for explaining the present invention in detail. Explanation of symbols: 1, 2... Arc contactor, 3... Arc, 6... Shaft interior space, 9, 32... Gas flow,
lL12,30...Exhaust port (ventilation port).

Claims (1)

[Claims] 1. A breaker having at least one pair of opposing hollow arc contacts through which a fluid penetrates, and a fluid spraying device that generates fluids that flow from the opposing end openings of the arc contacts to the hollow portions of the arc contacts. In the device, one of the arc contacts is formed with a suction chamber whose volume increases in relation to the opening and closing movement of the arc contact, and the suction chamber is connected to the other arc contact through the hollow part of the one arc contact. The arc contact is communicated with the hollow part of the arc contact, and at least immediately after the arc contact is opened, a flow of fluid is generated flowing from the other hollow part of the arc contact into the hollow part of the one arc contact. A fluid spray type breaker characterized by: