KR20090055493A - Puffer type circuit breaker using insulation gas - Google Patents

Abstract

A puffer type circuit breaker using insulation gas is provided to increase electrical and mechanical reliability by reducing the size of the breaker without damage of the performance of the breaker. A breaker includes a fixed and movable main contact(21,22), fixed and movable arc contact, a buffer, and insulating nozzle(27). A flange-shaped pressure unit is formed at the end of the insulating nozzle, and the hollow cylinder unit is arranged to be concentric with the fixed arc contact. The flange-shaped pressure unit is moved from the inside of the hollow cylinder, which has a pressure receiving plate. A gas release hole is formed at the side of a semi-insulating nozzle of the pressed plate, and the insulating nozzle sprays the insulating gas between the fixed arc contact and the movable arc contact. A part of the ejected gas remains between the flange-shaped pressure unit and a pressure plate of the hollow cylinder unit temporarily.

Description

Puffer Type Gas Insulated Breakers {PUFFER TYPE CIRCUIT BREAKER USING INSULATION GAS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puffer type gas insulated circuit breaker, and more particularly, to a puper type gas insulated circuit breaker capable of reducing the operating force of a manipulator for driving the interruption section at the time of current interruption.

In general, a puff-type gas insulated circuit breaker is provided with an insulating gas such as SF ₆ having a good insulation performance and arc extinguishing performance while arranging a circuit breaker composed of fixed and movable main contacts or other parts in a metal container. It is charged.

As is well known, the blocking portion includes a fixed and movable main contactor connected to the conductive conductor, an arc contactor on the fixed side and the movable side, and a puffer cylinder and a piston constituting a puffer device that compresses the insulating gas during the breaking operation. And an insulating nozzle for extinguishing the compressed insulating gas by arcing and extinguishing it.

The entire movable side including the arc contactor, the movable main contactor and the puffer device of the breaker part is driven by the manipulator. At this time, the insulating gas compressed by the puffer device is injected into the arc generated in each arc contact portion of the insulating nozzle and extinguished to cut off the current.

Therefore, since the interruption | blocking ability of a interruption | block part depends on the operation force of the manipulator which drives the whole of a movable side, it is said that it is preferable to use the manipulator with a large operation force. However, if the operation force of the manipulator is merely increased without considering the movement of the breaker, the overall structure of the manipulator becomes large and large, and the reliability of the overall mechanical strength including the breaker is also lowered.

For this reason, the puffer-type gas insulated circuit breaker of Unexamined-Japanese-Patent No. 8-279325 (patent document 1) can maintain the ability to interrupt | block the interruption part, and proposes the countermeasure which can reduce the operating force of an actuator, and can aim at miniaturization. Doing. This puffer-type gas insulated circuit breaker changes the cross-sectional area of the puper cylinder which comprises a puper apparatus into two things, and adds a floating piston mainly using the piston arrange | positioned inside.

In the patent document 1, the opening operation of the blocking section is performed by compressing the insulating gas with a large compressive force in a region having a large compression cross section utilizing a floating piston, and at the end of the opening operation of the blocking section, only the main piston is compressed. Insulated gas is compressed and injected in a small cross-sectional area. This reduces the cross-sectional area where the puffer device receives the reaction force of the heat gas from the arc side, thereby preventing the opening operation of the breaker portion from being disturbed.

Moreover, the puffer-type gas insulated circuit breaker of Unexamined-Japanese-Patent No. 10-269913 (patent document 2) can ensure insulation performance, even if the distance between each contactor of the fixed side and the movable side of a interruption | blocking part is reduced. By reducing the distance between the contacts, it has been proposed to reduce the operating force of the manipulator.

The puff-type gas insulated circuit breaker is arranged between the fixed side of the breaker and each contactor on the movable side, and arranges a shield electrode having a fixed contact and a conductive point on a concentric basis, and sets the shield electrode of the movable main contactor. It moves to the movable main contact side with movement.

The puffer-type gas insulated breakers described in Patent Documents 1 and 2 described above can reduce the operating force of the manipulator. By the way, the blocking capability of the breaker depends on whether or not the insulating gas injected toward the arc of each arc contact portion can be compressed in a very short time. In other words, if the operating force of the manipulator is the same, it is determined by the size of the puffer cylinder and the piston constituting the puffer device.

In order to improve the breaking ability of the breaker, a manipulator having a large operating force may be simply used, or a puffer device may be made large and a large manipulator may be combined. However, in either of these cases, there is a problem that the entire puffer-type gas insulated circuit breaker becomes large and cannot be manufactured economically. For this reason, it is requested | required to be able to use the manipulator which reduced operation force for a puff type gas insulation breaker.

SUMMARY OF THE INVENTION An object of the present invention is to provide a puff-type gas insulated circuit breaker that can be manufactured economically by using a manipulator with a reduced operating force and making the whole compact and light.

The puffer-type gas insulated circuit breaker of the present invention is a puffer device having at least a fixed and movable main contactor, an arc contactor on the fixed side and a movable side, a puper cylinder and a piston, and a current interruption in a container filled with insulating gas. When arranging a blocking portion having an insulating nozzle for injecting the insulating gas compressed by the puffer device into the arc between the arc contactors, a flange-shaped pressure receiving portion is integrally formed at the distal end of the insulating nozzle, A hydraulic plate in which the flange-shaped hydraulic part is movable inside and a hollow cylindrical part arranged concentrically with the arc contact on the fixed side, and the hollow cylindrical part has a gas discharge hole formed on the semi-insulated nozzle side. Between the flange-shaped hydraulic part of the insulating nozzle and the hydraulic plate of the hollow cylindrical part to temporarily hold the insulating gas injected into the arc, It is comprised so that the said flange-shaped hydraulic pressure part may be pressurized by the on-gas pressure.

Preferably, the axial length dimension of the hollow cylindrical portion is configured to position the flange-shaped hydraulic pressure portion of the insulating nozzle in the hollow cylindrical portion at the blocking point of the blocking portion and to exit the hollow cylindrical portion before reaching the blocking position. It is characterized by.

When the puffer-type gas circuit breaker is configured as in the present invention, the operation speed in the blocking direction at the time of current interruption can be increased to increase the breaking speed, so that a manipulator with reduced operating force can be used, without impairing the breaking performance of the breaking portion. The whole can be made small and light, and it can be manufactured economically. Therefore, the electrical and mechanical reliability of the puffer type gas insulated circuit breaker can be further improved.

Example 1

Hereinafter, an example of the vertical puffer type gas insulated circuit breaker to which the present invention is applied will be described with reference to FIGS. 1 to 6. The puffer-type gas insulated circuit breaker of FIG. 1 arrange | positions the interruption | blocking part 20 in the metal tubular container 10 which fills insulation gas.

The breaker 20 includes fixed and movable main contacts 21 and 22 through which energizing current flows, arc contacts 23 and 24 on the fixed and movable sides where arcs are generated during the breaking operation, and an insulating nozzle 27. The tubular conductors 28 and 29 on the fixed side and the movable side, which face each other, such as a puffer device composed of a puffer cylinder 25 and a piston 26 to which are installed, and an insulating cylinder 30 interposed therebetween. It is arranged inside the configuration.

The puper cylinder 25 of the puffer device is connected to an actuator (not shown) via an insulating rod 31 or a lever 32. When the manipulator operates and moves the puffer cylinder 25 downward, the manipulator cooperates with the piston 26 to compress the insulating gas.

Then, when the fixed arc contactor 23 connected to the tubular conductor 28 exits the insulated nozzle 27, the compressed insulating gas is quickly compressed into the arc contactor 23 on the fixed and movable sides. 24) Spray toward the arc generated between them and extinguish the arc in a very short time.

The conductive conductors 11 and 12 are connected to the tubular conductors 28 and 29 located on the fixed side and the movable side of the breaker 20, and are led to the external circuit through the insulating spacers 13 and 14, respectively. Doing.

In the interruption | blocking part 20 of this invention, as shown in detail in FIG. 2, the flange-shaped hydraulic pressure part 27A is integrally formed in the part of the insulating nozzle 27, ie, in the front end part. Moreover, the flange-shaped hydraulic pressure part 27A provided in the insulating nozzle 27 is engaged with the hollow cylindrical part 33 so that a movement is possible.

The hollow cylindrical portion 33 is supported by the cylindrical conductor 28 and disposed concentrically with the arc contact 23 on the fixed side. The hollow cylindrical portion 33 is a gas at the semi-insulated nozzle side (the upper end in the figure), which is one end. A hydraulic plate 34 having a discharge opening 35 is provided.

Thus, when the manipulator is driven to cut off the current, a part of the insulating gas injected into the arc between the arc contacts 23 and 24 is transferred to the flange-shaped water pressure part 27A of the insulating nozzle 27. In the space with the hydraulic plate 34 of the hollow cylindrical portion 33 temporarily.

The high pressure gas staying in the space portion of the hollow cylindrical portion 33 provided with the hydraulic plate 34 is applied to the flange-shaped hydraulic portion 27A of the insulating nozzle 27 to the lever 32. The movement to the side of the insulated rod 31 connected is quickened to assist the operating force of the manipulator.

The hollow cylindrical portion 33 is set in consideration of the blocking operation of the blocking portion 20 as described later in this axial length dimension. That is, the length dimension in the axial direction of the hollow cylindrical portion 33 is such that the flange-shaped hydraulic portion 27A of the insulating nozzle 27 is engaged in the hollow cylindrical portion 33 at the breaking point of the blocking portion 20. In the state, and before reaching the interruption | blocking position of the interruption | blocking part 20, it sets and manufactures so that the flange-shaped hydraulic pressure receiving part 27A of the insulating nozzle 27 may be let out from the hollow cylindrical part 33.

Moreover, the gas discharge opening 35 provided in the hydraulic plate 34 of the hollow cylindrical part 33 is a hollow based on the state of the retention and exhaust of insulation gas, for example, by the simulation etc. which used the model. The pressure rise in the cylindrical part 33 is measured and formed in consideration of the extent to which the flange-shaped hydraulic part 27A of the insulating nozzle 27 helps the drive operation force of a manipulator. In addition, the flange-shaped pressure receiving portion 27A of the insulating nozzle 27 has a size of the hydraulic pressure area for the inner diameter of the cylindrical conductor 28 and the insulating cylinder 30, and the cylindrical conductor 28 at the time of manufacture. Consider fixing.

In FIG. 2, the insulating gas injected from the insulating nozzle 27 temporarily stays in the hollow cylindrical portion 33, and a high-temperature gas pressure is applied to the flange-shaped hydraulic pressure portion 27A to assist the operation force of the manipulator. It demonstrates below using the graph of FIG. 5 and FIG.

2 to 5 show each state of the breaker, and FIG. 6 shows the characteristic lines SA of each stroke on the movable side of the breaker corresponding to D (time tA to tD) in each state A and the puffer device. The gas pressure characteristic line PS to compress and the opening-closing line AC of the arc contact 24 of the movable side are shown.

First, in the state of the insertion position of FIG. 2 in which each contactor of the blocking portion 20 is in contact with and connected, the flange-shaped pressure receiving portion 27A at the tip of the insulating nozzle 27 is a hydraulic plate of the hollow cylindrical portion 33. It is close to 34. At this time, at the injection position A of the interruption | blocking part 20 at the time point tA of FIG. 6, since a puff apparatus is before operation, the gas pressure shown by the gas pressure characteristic line PS does not rise, and the arc contactor 24 is carried out. ) Is also closed.

Next, when the movable part side of the interruption | blocking part 20 of FIG. 3 becomes a state of an opening point, the puper cylinder 25 moves downward, the fixed and movable main contactors 21 and 22 open, and an arc contactor Between the 23 and 24, it is just before opening, and with the movement of the insulating nozzle 27, the flange-shaped hydraulic part 27A of the front end moves away from the hydraulic plate 34 side of the hollow cylindrical part 33. As shown in FIG. In this state, the insulation gas compressed by the puffer device is moved to the gas pressure characteristic line PS by the movement of the puffer cylinder 25 to the opening point B of the interruption section 20 at the time point tB in FIG. 6. The gas pressure shown also gradually increases.

Subsequently, in the state where the movable part side of the breaker part 20 of FIG. 4 becomes a current breakpoint, when the puffer cylinder 25 moves further downward, and the arc contacts 23 and 24 are opened, an arc will become between them. Generated, and the insulating gas compressed by the puffer device is injected to the arc. And at the current interruption point C of the time point tC of FIG. 6, the gas pressure shown by the gas pressure characteristic line PS rises rapidly as insulation gas becomes high temperature by the compression of a puffer apparatus, and injection to an arc.

The insulating gas, which has become hot by injection, is blown into the hollow cylindrical portion 33 as the arc contactor 23 on the fixed side moves as the insulating nozzle 27 moves, but part of the insulating gas is discharged from the gas discharge opening 35 into the container. However, exhaust is suppressed by the hydraulic plate 34 provided at the end. When the high-temperature insulating gas temporarily stays in the hollow cylindrical portion 33, the internal pressure rapidly rises and is applied to the flange-shaped hydraulic pressure portion 27A, thereby assisting the movement of the puffer cylinder 25 and adding to the operating force of the manipulator. Done.

When the state of the interruption | blocking position of the interruption | blocking part 20 shown in FIG. 5 is the last, since the flange-shaped hydraulic pressure part 27A of the insulation nozzle 27 completely escapes from the hollow cylindrical part 33, high-temperature insulation The gas is quickly exhausted into the container 10 shown in FIG. 1 or into the insulating cylinder 30. In the state of the cutoff position D at the time point tD in FIG. 6, when the insulating gas is in the exhausting process, the gas pressure also rapidly decreases as indicated by the gas pressure characteristic line PS.

As described above, the flange-shaped hydraulic portion 27A is provided at the tip of the insulating nozzle 27 and the flange-shaped hydraulic portion 27A can be moved to the hollow cylindrical portion 33 having the hydraulic plate 34. If it is kept in such a position, the internal gas blown into the interior temporarily stays and the internal pressure rises. The internal pressure which rises in the hollow cylinder part 33 presses the flange-shaped hydraulic part 27A of the insulating nozzle 27 to the moving direction of the puper cylinder 25. As shown in FIG. For this reason, since a manipulator can use a small thing with a small operation force compared with the past, without damaging the interruption | blocking performance of a interruption | blocking part, it can be manufactured compact and light weight and economically manufactured.

The puffer-type gas circuit breaker of the present invention utilizes the insulating gas after being blown into the arc by changing the structure near the distal end of the insulating nozzle which injects the insulating gas compressed by the puffer device into the arc between the fixed and movable arc contacts. In addition, it helps to increase the breaking speed by assisting the operation force in the breaking direction when breaking current. This makes it possible to use a manipulator with reduced operation force for the puff-type gas circuit breaker, and is suitable for making the whole compact and light and economical without impairing the breaking performance of the breaker.

1 is a schematic longitudinal sectional view showing an example of a puffer-type gas insulated circuit breaker to which the present invention is applied;

FIG. 2 is a schematic longitudinal sectional view showing a state of a closing position in the blocking section of FIG. 1;

FIG. 3 is a schematic longitudinal cross-sectional view showing a state at the time of opening at the blocking portion of FIG. 2;

4 is a schematic longitudinal cross-sectional view showing a state at the time of current interruption at the breaker of FIG. 2;

5 is a schematic longitudinal cross-sectional view illustrating a state of a blocking position in the blocking unit of FIG. 2;

FIG. 6 is a graph showing the relationship between the gas pressure and the time of the puffer device at each time point in FIGS. 2 to 5 of the present invention. FIG.

Claims (2)

In the container filled with the insulating gas, at least the fixed and movable main contactor, the arc contactor on the fixed and movable side, the puffer device having a puffer cylinder and a piston, and the insulation gas compressed by the puffer device at the time of interrupting the current. In the puffer-type gas insulated circuit breaker having a blocking unit having an insulating nozzle for spraying the arc between the arc contactor, A flange-shaped pressure receiving part is integrally formed at the tip of the insulating nozzle, and the hollow pressure-receiving part is provided with a hollow cylindrical part which is movable inward and is disposed concentrically with the arc contact on the fixed side. The hollow cylindrical part is insulated. The hydraulic plate which has a gas discharge hole formed in the nozzle side, and between the flange-shaped hydraulic part of the said insulated nozzle and the hydraulic plate of the said hollow cylindrical part, the insulating gas injected to the arc temporarily stays, and the said flange is carried out by the high temperature gas pressure. A puff-type gas insulated circuit breaker, configured to pressurize the shape hydraulic pressure section. The method of claim 1, The length dimension in the axial direction of the hollow cylindrical portion is configured to position the flange-shaped hydraulic pressure portion of the insulating nozzle in the hollow cylindrical portion at the breaking point of the breaking portion and to exit from the hollow cylindrical portion before reaching the breaking position. Puffed gas insulated breakers.

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