JPH08167357A - Gas-blast circuit-breaker - Google Patents

Abstract

PURPOSE: To improve an arc extinguising function and an insulating performance without making a circuit-breaker large by forming a plurality of side path blasting holes and sucking holes having prescribed openings in a spraying nozzle. CONSTITUTION: A plurality of side path blasting holes 13 of which one ends are opened in the circumferential part of the lower end open port of a main nozzle hole 12 of a blasting nozzle 11 and the other ends are opened in the circumferential part of the upper end open port of the hole 12 are formed and sucking holes 14 of which one ends are opened in the outer circumferential face of the nozzle 11 and the other ends are communicated with the holes 13 are also formed. Consequently, at the time of shutting large current, a high pressure gas in the buffer chamber 8 passes the holes 13 and due to suction force attributed to high flow velocity of the high pressure gas, a fresh gas in the outside of the nozzle 11 which is not affected by the heat of arc is sucked, mixed with the high pressure gas in the holes 13, and the resulting gas is discharged on the arc fixed contactor 1 side, that is in the downstream of the nozzle 11. As a result the gas flow rate in the downstream of the nozzle 11 is increased and blasting of the compressed gas can be sufficiently carried out and without making an apparatus large, an arc extinguishing function and an insulating performance can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a gas-insulated switchgear to extinguish an arc by blowing a compressed gas in a puffer chamber to an arc generated when a fixed contact and a movable contact are separated. The present invention relates to a puffer type gas circuit breaker for high voltage.

[0002]

2. Description of the Related Art A conventional gas circuit breaker of this type is shown in FIG.
It has the configuration shown in. In the figure, A is a closed state, B is a shut-off state, 1 is a cylindrical arc fixed contactor, 2 is an annular main fixed contact provided outside the lower end of the arc fixed contactor 1. A plurality of contact pieces are formed in an annular shape and cover the arc fixed contact 1. Reference numeral 3 is a spring provided on the main fixed contactor 2.

Reference numeral 4 denotes a piston fixed below the fixed arc contact 1, reference numeral 5 denotes a movable conductor that penetrates the piston 4 in an airtight manner and is vertically movable, and reference numeral 6 denotes an upper end portion of the movable conductor 5. It is a cylindrical arc movable contactor, and is composed of a plurality of contactor pieces and is brought into contact with and separated from the peripheral surface of the arc fixed contactor 1. Reference numeral 7 denotes a puffer cylinder whose upper end is integrally provided on the upper end of the movable conductor 5, and the inner surface of which is in sliding contact with the piston 4. Reference numeral 8 is a puffer chamber formed by the inner surface of the cylinder 7 and the piston 4, 9 is a blowout hole formed in the upper end of the cylinder 7, the lower end of which communicates with the puffer chamber 8, and the upper end of the movable arc contact 6. It is open to the outside.

Reference numeral 10 denotes a cylindrical main movable contactor which is provided integrally with the upper end portion of the cylinder 7 and outside the arc movable contactor 6, and which comes into contact with and separates from the inner surface of the main fixed contactor 2.
Reference numeral 11 is a spray nozzle whose base is fixed to the inner surface of the main movable contact 10 and covers the movable arc contact 6, and 12 is a nozzle 11
Is a main nozzle hole in the vertical direction formed in the center of the puffer chamber 8 and communicates with the blowout hole 9 of the puffer chamber 8.

Next, the operation will be described. FIG. 2A shows a closed state in which the movable conductor 5 and the cylinder 7 are moved upward, the main movable contact 10 is moved to the main fixed contact 2, and the arc movable contact 6 is moved.
Contact each of the arc fixed contacts 1 and the inside of the puffer chamber 8 expands as the cylinder 7 moves upward, and the blowout holes 9 and
Although not shown, insulating gas is sucked into the puffer chamber 8 from a check valve provided in the piston 4.

Next, when the cutoff command is received, the movable conductor 5
At the same time, the cylinder 7 moves downward, and as shown in FIG. 2B, the main movable contact 10 separates from the main fixed contact 2, and thereafter,
The movable arc contact 6 is separated from the fixed arc contact 1,
An arc is generated between both arc contacts 1 and 6.

At this time, since the inside of the puffer chamber 8 is compressed as the cylinder 7 moves downward, the insulating gas in the puffer chamber 8 passes through the blow-out hole 9 and the main nozzle hole 12 and is fixedly contacted by the arc of the nozzle 11. The arc is extinguished by being guided to the tip of the child 1 and blowing an insulating gas to the arc between the arc contacts 1 and 6.

Next, when a closing command is received, the movable conductor 5 and the cylinder 7 move upward, the arc movable contact 6 comes into contact with the arc fixed contact 1, and then the main fixed contact 2 comes to the main movable contact. 10 comes into contact with each other to be in the closed state shown in FIG. 2A.

[0009]

In the case of the conventional gas circuit breaker, the arc extinguishing performance is deteriorated due to a blocking phenomenon due to an arc when a large current is interrupted. That is, in the case of a large current, since the diameter of the arc at the time of interruption is large and the pressure in the main nozzle hole 12 is also high, the compressed gas is not sufficiently discharged from the blowout hole 9 of the puffer chamber 8, Gas flow is insufficient,
Arc extinguishing performance and insulation performance deteriorate.

Therefore, it is conceivable to increase the diameter of the nozzle 11, but if the diameter of the nozzle 11 is increased, it is necessary to increase the size of the arc fixed contactor 1 and the size of the apparatus becomes large, resulting in cost and installation space. There is a problem that it becomes a disadvantage. In consideration of the above points, the present invention improves the arc extinguishing performance and the insulation performance without sufficiently increasing the size of the device by sufficiently blowing the compressed gas regardless of the blocking phenomenon due to the arc at the time of breaking the large current. It is an object of the present invention to provide a gas circuit breaker that can be used.

[0011]

In order to solve the above-mentioned problems, a gas circuit breaker of the present invention is formed by a puffer cylinder vertically movable below a fixed contact, a cylinder and a piston, A puffer chamber having a blow-out hole in the upper part, a movable contactor that is integrally provided in the upper part of the cylinder and that comes in contact with and separates from a fixed contactor, and is provided in the upper end part of the cylinder.
In a gas circuit breaker equipped with a spray nozzle covering a movable contactor and a main nozzle hole formed in the center of the nozzle and communicating with an outlet hole, one end of the gas breaker is opened at the peripheral edge of the lower end opening of the main nozzle hole of the nozzle. And the other end has a plurality of side passage blowing holes that are open at the peripheral edge of the upper end opening of the main nozzle hole of the nozzle, and the suction hole that has one end opened to the outer peripheral surface of the nozzle and the other end communicating with the side passage blowing hole. It is equipped with and.

[0012]

In the gas circuit breaker of the present invention constructed as described above, one end is opened at the peripheral portion of the lower end opening of the main nozzle hole of the nozzle, and the other end is formed at the peripheral portion of the upper end opening of the main nozzle hole of the nozzle. Since a plurality of open side-by-side spray holes are provided, one end of which is opened on the outer peripheral surface of the nozzle and the other end of which is provided with a suction hole that communicates with the bypass by-pass hole, compression of the cylinder due to downward movement of the large current High-pressure gas in the puffer chamber passed through the side-by-side blow hole, and the high-speed flow of this high-pressure gas sucked in the fresh gas outside the nozzle, which was not heated by the arc from the suction hole. It mixes with the high-pressure gas in the holes and is discharged to the arc fixed contact side of the nozzle, that is, to the downstream side.The gas flow rate on the downstream side of the nozzle increases and the compressed gas is sufficiently sprayed regardless of the blockage phenomenon due to the arc. , Without upsizing the device Arc extinguishing performance and insulation performance is improved.

[0013]

EXAMPLE One example will be described with reference to FIG.
In the figure, the same symbols as those in FIG. 2 indicate the same or corresponding ones, and the different points are as follows. Reference numeral 13 denotes a plurality of side passage spraying holes, one end of each of which is a spray nozzle 1
1. The main nozzle hole 12 is opened at equal intervals on the peripheral edge of the lower end opening, and the other end is opened on the peripheral edge of the upper end opening of the main nozzle hole 12 of the nozzle 11. Reference numeral 14 denotes a plurality of suction holes, one end of each of which is opened at an equal interval on the outer peripheral surface of the nozzle 11 and the other end of which is in communication with the side passage blowing hole 13.

At the time of shutoff, the high pressure gas in the puffer chamber 8 compressed by the downward movement of the cylinder 7 causes the bypass passage holes 13 to pass.
Through the suction force of the high-speed flow of this high-pressure gas,
Nozzle 1 not receiving heat from arc from suction hole 14
1. Fresh gas on the outside of 1 is sucked in and mixed with the high pressure gas in the by-pass spray hole 13 and the arc fixed contact 1 of the nozzle 11
Side, that is, the downstream side of the nozzle 11, the flow rate of the gas on the downstream side of the nozzle 11 is increased and the compressed gas is sufficiently sprayed regardless of the blocking phenomenon due to the arc, and the arc extinguishing performance and insulation performance are improved. To do. The present invention can also be applied to a puffer type gas circuit breaker without the fixed arc contact 1 and the movable arc contact 6.

[0015]

Since the present invention is constructed as described above, it has the following effects. In the gas circuit breaker of the present invention, one end is opened at the peripheral portion of the lower end opening of the main nozzle hole 12 of the spray nozzle 11, and the other end is opened at the peripheral portion of the upper end opening of the main nozzle hole 12 of the nozzle 11. By-pass spray holes 13 are provided, one end of which opens on the outer peripheral surface of the nozzle 11,
Since the suction hole 14 having the other end communicating with the side passage blowing hole 13 is provided, the high pressure gas in the puffer chamber 8 compressed by the downward movement of the cylinder 7 passes through the side passage blowing hole 13 when the large current is cut off.
Due to the suction force of this high-speed flow of high-pressure gas, the suction hole 1
3, fresh gas outside the nozzle 11 that has not received heat from the arc is sucked in, mixed with the high-pressure gas in the side-by-side spray hole 13, and flows to the arc stationary contactor 1 side of the nozzle 11, that is, to the downstream side of the nozzle 11. As a result, the gas flow rate on the downstream side of the nozzle 11 can be increased and the compressed gas can be sufficiently sprayed regardless of the blockage phenomenon due to the arc, without increasing the size of the device. , Arc extinguishing performance and insulation performance can be improved.

[Brief description of drawings]

FIG. 1 is a cutaway front view of one embodiment of the present invention.

2A and 2B are cut-away front views of a conventional example in a closed state and a closed state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed contactor 4 Piston 6 Movable contactor 7 Cylinder 8 Puffer chamber 9 Blowing hole 11 Blowing nozzle 12 Main nozzle hole 13 Side passage blowing hole 14 Suction hole

Claims (1)

[Claims] 1. A puffer cylinder that is vertically movable below a fixed contact, a puffer chamber that is formed by the cylinder and a piston, and has a blowout hole in the upper portion, and a puffer chamber that is integrally provided in the upper portion of the cylinder. A movable contactor that comes into contact with and separates from the fixed contactor, a spray nozzle that is provided at an upper end portion of the cylinder and covers the movable contactor, and a main nozzle that is formed at a central portion of the nozzle and communicates with the blowout hole. In a gas circuit breaker having a nozzle hole, one end of the gas circuit breaker is opened at a peripheral portion of a lower end opening of the main nozzle hole of the nozzle, and the other end is opened at a peripheral portion of an upper end opening of the main nozzle hole of the nozzle. A gas circuit breaker comprising: one by-pass blowing hole; and a suction hole, one end of which is opened on the outer peripheral surface of the nozzle and the other end of which is in communication with the by-pass blowing hole.