JP2002075146A - Puffer type gas-blast circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components in a control means for distribution of gas. SOLUTION: A first control means 91 for distributing gas comprises a first recess 12 disposed on the inner wall of a puffer cylinder 8 and formed on the sliding part applied to a fixed piston 11; and an opening 70, disposed on an outer diameter of the fixed piston 11 and formed on the sliding part applied to the puffer cylinder 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker for an AC circuit, and more particularly to a low-cost circuit breaker having a smaller number of components than conventional ones.

[0002]

2. Description of the Related Art FIG. 31 is a sectional view showing the internal structure of a conventional puffer type gas circuit breaker. SF ₆ which is an insulating gas
A fixed arc contact 2 and a movable arc contact 4 are housed in a closed vessel (not shown) in which gas is sealed so as to be able to approach and separate from each other. The fixed arc contact 2 is formed in a rod shape, is integrally formed with the fixed current-carrying contact 50, and is connected to an AC circuit. On the other hand, the movable arc contact 4 is formed in a cylindrical shape and is attached to the lower end of the exhaust rod 6. A puffer cylinder 8 is fixed to the outer periphery of the exhaust rod 6, and a movable energizing contact 51 and an insulating nozzle 18 are attached to a lower end of the puffer cylinder 8. A fixed piston 11 is inserted between the puffer cylinder 8 and the exhaust rod 6, and the fixed piston 11
Slides on the inner diameter surface of the puffer cylinder 8 and the outer diameter surface of the exhaust rod 6. Thereby, a cylindrical puffer chamber 8A is formed inside the puffer cylinder 8, and the fixed piston 11 is inserted into the puffer chamber 8A to close the upper part of the puffer chamber 8A. A drive device (not shown) is connected to an upper portion of the exhaust rod 6 outside the closed container. In addition, an exhaust hole 6A communicating with the inside of the insulating nozzle 18 is formed inside the exhaust rod 6, and the upper side of the exhaust hole 6A is formed with an opening hole 6B penetrating in the radial direction to communicate with the free space 33 in the sealed container. Communicating. Further, a space 11 </ b> A surrounded by the fixed piston 11 also communicates with the free space 33 through the ventilation hole 10. The fixed arc contact 2, the fixed energizing contact 50, and the fixed piston 11 are all fixed to the closed container side and are immobile. On the other hand, the movable arc contact 4 and the movable energizing contact 5
1, exhaust rod 6, puffer cylinder 8, and insulating nozzle 1
8 form a movable part. This movable portion is driven by the above-described drive device and moves up and down in FIG. The driving device drives the movable unit with the force of the spring that is electrically charged.

FIG. 31 is a diagram showing a case where the circuit breaker is in a closed state in FIG. The current flowing through the breaker is always 50
, And the movable current-carrying contact 51, and both the fixed arc contact 2 and the movable arc contact 4. When a cutoff command is issued in the state of FIG. 31, the driving device operates to move the movable part such as the movable arc contact 4 upward, and the pressure in the puffer chamber 8A increases accordingly. this is,
Because the upper part of the puffer chamber 8A is sealed by the fixed piston 11, the internal volume of the puffer chamber 8A is gradually reduced as the movable part moves. When the movable portion further rises, first, the fixed energizing contact 50 and the movable energizing contact 51 are separated. At that time, the fixed arc contact 2 and the movable arc contact 4 are set so as not to be separated yet. Therefore, the energizing current is fixed arc contact 2
Therefore, no arc is generated in the separation gap between the fixed current-carrying contact 50 and the movable current-carrying contact 51. Therefore, the fixed energizing contact 50 and the movable energizing contact 51 do not wear out. When the movable portion further rises, the fixed arc contact 2 and the movable arc contact 4 start to separate, and an arc is generated in the separation gap. At this time, the insulating gas compressed in the puffer chamber 8A blows out from the blowout hole 60 into the insulating nozzle 18. The insulating gas is brought into a state of high temperature and high pressure by the addition of arc heat. Further, when the movable part rises, the fixed arc contact 2 is moved to the insulating nozzle 1.
8, the high-temperature and high-pressure insulating gas inside the insulating nozzle 18 blows downward. On the other hand, a part of the high-temperature and high-pressure insulating gas also blows out from the exhaust hole 6A of the exhaust rod 6 to the upper free space 33 through the opening hole 6B. The arc in the separation gap is cooled and extinguished by the flow of the insulating gas.

In the apparatus shown in FIG. 31, an expansion chamber 30 surrounded by a fixed piston 11 and an exhaust rod 6 is formed above a puffer chamber 8A. Also, the fixed piston 11 has
A gas vent hole 42 for communicating the expansion chamber 30 with the puffer chamber 8A is formed. A degassing rod 45 is passed through the degassing hole 42, a degassing valve 43 is mounted on an upper end of the degassing rod 45, and a spring receiver 46 is mounted on a lower end of the degassing rod 45. . A compressible spring 44 is interposed between the spring receiver 46 and the fixed piston 11. On the other hand, an intake hole 52 that connects the free space 33 and the expansion chamber 30 is formed in the protruding portion 6C of the exhaust rod 6. An intake rod 47 is passed through the intake hole 52, a check valve 40 is attached to a lower end of the intake rod 47, and a spring receiver 41 is attached to an upper end of the intake rod 47. A compressible spring 48 is interposed between the spring receiver 41 and the protrusion 6C. As will be described later, the vent valve 43 is a first gas flow control means, and the check valve 40 is a second gas flow control means. It is for adjusting the pressure. That is, the degassing valve 43, which is the first gas flow control means, has the maximum arc time T
_MAX (maximum time that the breaker can extinguish the arc)
Until the puffer chamber 8A is closed, the insulating gas in the puffer chamber 8A is purged after the maximum arc time.
To be released to On the other hand, the check valve 40 is a second gas flow control unit, up to a maximum arc time T _MAX during blocking is to the expansion chamber 30 in a sealed container and communicating state.

In the above-described shut-off mechanism, the pressure in the puffer chamber 8A rises during the shut-off operation. On the other hand, a large reaction force is applied to the driving device by the pressure in the puffer chamber 8A, and the movable part is moved downward in FIG. It tends to be pushed back to. Therefore, it becomes necessary that a large large driving force as a driving device, by lowering the pressure in the puffer chamber 8A after past the maximum arc time T _MAX has a first gas flow control unit, the drive unit Such a reaction force is reduced, and the drive device can be downsized. That is, if previously set the spring force of the spring 44 so that the gas vent valve 43 with a pressure of the puffer chamber 8A at the maximum arc time T _MAX is pushed upwards, the gap between the fixed piston 11 and the gas vent valve 43 The insulating gas in the puffer chamber 8A
Flows toward zero. As a result, the pressure in the puffer chamber 8A decreases. In addition, since the pressure in the expansion chamber 30 increases, the pressure increase in the expansion chamber 30 generates a force to push the movable portion upward, and this force is added to the driving force of the driving device. The reaction force on is reduced.

[0006] The expansion chamber 30 is expanded in conjunction with the compression of the puffer chamber 8A before the insulating gas flows from the puffer chamber 8A. When the expansion chamber 30 itself expands, the pressure is reduced and the pressure in the free space 33 becomes slightly negative. Expansion chamber 3
When 0 becomes a negative pressure, a force is generated that pushes the movable portion downward, and a reaction force is applied to the drive device. When the pressure in the expansion chamber 30 becomes negative with respect to the free space 33, the second
If the spring force of the spring 48 is set in advance so that the check valve 40 serving as the gas flow control means is pressed downward, the free space 33 passes through the gap between the check valve 40 and the projection 6C of the exhaust rod 6. Is flowing toward the expansion chamber 30. Thereby, it is possible to prevent the pressure in the expansion chamber 30 from becoming negative.

FIG. 32 is a characteristic diagram showing characteristics of the device shown in FIG. The horizontal axis represents time, and the vertical axis represents current, the position of the movable part, and the pressure rise in the puffer chamber or the expansion chamber. A waveform 57 is a short-circuit current flowing from the AC circuit into the device shown in FIG. 31, and characteristics 54S, 54P, and 54Q indicated by solid lines are the position of the movable portion of the device shown in FIG. It is a time characteristic of a pressure rise. In FIG. 32,
When a short-circuit current such as the waveform 57 flows in the AC circuit, when a cutoff command is issued at time T0, the movable part of the circuit breaker moves from the closed position X to the closed position Y as indicated by a characteristic 54S. Then, at time T1, the separation gap between the fixed arc contact 2 and the movable arc contact 4 starts to open.
On the other hand, the pressure of the puffer chamber 8A rises due to the movement of the movable part as indicated by the characteristic 54P, and the puffer chamber 8A
Is blown to the arc generated in the separation gap, and the arc disappears at the zero point of the short-circuit current at time T3. After time T3, the movable part further moves in the Y direction, and the pressure in the puffer chamber 8A decreases.
The shut-off operation is completed at. Note that the arc time during which an arc is generated is between the times T1 and T3 of the waveform 57 in FIG. 31, and the waveform 57 becomes zero after T3 because the arc disappears and the current is cut off.

[0008] The circuit breaker has a minimum arc as shown in FIG.
Work time T_MINAnd the maximum arc time T _MAXThere is. minimum
Arc time T_MINMeans that the circuit breaker can be turned off
This is the minimum time. In the example of FIG. 32, the circuit breaker starts opening.
Time T1 to minimum arc time T_MINTime span until
Almost half a cycle. That is, the time T_MINPreviously
Arc because the breaker break gap is not yet wide enough
Can not be erased. Therefore, the short-circuit current
Even if it reaches zero at time T2 as in 7
At the point, the arc does not extinguish, and at time T3, the next zero,
Only then will the short-circuit current be cut off. On the other hand,
Large arc time T_MAXMeans that the circuit breaker is
This is the maximum time that can be surely erased.
In the example of the above, the maximum arc starts from the time T1 when the breaker starts to open.
Time T_MAXThe time width up to about 1 cycle. Most
Large arc time T_MAXIn, the separation gap is sufficiently open
At the same time, the fixed arc contact 2 comes out of the insulating nozzle 18.
The arc can be reliably extinguished. Therefore,
When the short-circuit current is equal to the maximum arc time T_MAXBefore
At time T3, it becomes zero, so at time T3
The short-circuit current is interrupted. Note that in FIG.
At time T1 at the moment when the
In this example, the contact 2 and the movable arc 4 start to separate.
Although shown, it should be understood that the opening gap is
It can start to open at various phases of the current.

Further, in FIG. 32, the pressure in the expansion chamber 30 from the maximum arc time T _MAX after as characteristic 54Q is rising. This is because, as described above, the insulating gas in the puffer chamber 8A in FIG. 31 enters the expansion chamber 30 via the gas release valve 43 which is the first gas flow control means. The reaction force acting on the driving device due to the increase in the pressure of the expansion chamber 30 becomes smaller. Until time T3, the expansion chamber 3
Even if 0 is inflated, the pressure in the expansion chamber 30 does not become negative unlike the characteristic 54Q. This is because the expansion chamber 30 is supplied with gas from the free space 33 via the check valve 40 as the second gas flow control means.

[0010]

However, the conventional apparatus as described above has a drawback that the number of parts is large, the cost is increased, and maintenance is troublesome. That is, the gas vent valve and the check valve, which are the gas flow control means, have a large number of parts and take a lot of time to be incorporated into the circuit breaker, thereby increasing the product cost. Further, when the circuit breaker is inspected, the vent valve and the check valve require maintenance, which requires much time and effort. SUMMARY OF THE INVENTION An object of the present invention is to provide a puffer-type circuit breaker having a reduced number of parts by eliminating the conventionally used gas vent valve and check valve.

[0011]

According to the present invention, there is provided a fixed arc contact, a movable arc contact which comes into contact with and separates from the fixed arc contact, and a movable arc contact which contacts the fixed arc contact. An exhaust rod fixed to the anti-fixed arc contactor side, a puffer cylinder provided on the outer peripheral side of the exhaust rod via a puffer chamber, and an anti-fixed arc sliding on the puffer cylinder and the exhaust rod. A fixed piston inserted into the puffer chamber from the contact side is housed in an airtight container together with an insulating gas, and a driving device for moving a movable portion composed of a movable arc contact, an exhaust rod, and a puffer cylinder is provided outside the airtight container. The puffer chamber is closed until the maximum arc time, and after the maximum arc time, the insulating gas in the puffer chamber is discharged to the fixed piston side. A first gas flow control means is provided, and when a shutoff command is issued, the driving device moves the movable portion to the side opposite to the fixed arc contact, and the insulating gas in the puffer chamber compressed by the movement of the movable portion contacts the fixed arc contact. In the puffer type gas circuit breaker, in which an arc generated between the opening and the gap between the armature and the movable arc contact is blown out, the first gas flow control means is arranged to slide with the fixed piston on the inner wall of the puffer chamber. A first concave portion formed in the portion and an opening formed in a sliding portion of the fixed piston with the inner wall of the puffer chamber, wherein the opening is closed by the inner wall of the puffer until the maximum arc time. The separation causes the puffer chamber to be in a closed state, and after a maximum arc time, the opening faces the first recess, so that the insulating gas in the puffer chamber is removed from the fixed piston. It may be such that it is released to the down side. Thereby, the first recess of the first gas flow control means is formed only by recessing the puffer cylinder or the exhaust rod which is a member forming the puffer chamber, and the opening is also formed in the fixed piston. Since it is formed only by opening, the gas vent valve conventionally used is not required, and the number of parts of the first gas flow control means is reduced.

In this configuration, an expansion chamber surrounded by a movable part and a fixed piston is formed on the side opposite to the puffer chamber of the fixed piston, and the first gas flow control means allows the buffer to be moved after a maximum arc time. A second gas flow control means including a first notch portion formed by notching a sliding portion of the fixed piston with the movable portion to discharge the insulating gas of the chamber to the expansion chamber; The second
The gas flow control means communicates the expansion chamber and the closed container through a gap between the first notch portion and the movable portion until a maximum arc time, and closes the gap after the maximum arc time. The communication between the expansion chamber and the closed container may be blocked. Thus, the first notch portion of the second gas flow control means is formed only by cutting the fixed piston, so that the conventionally used check valve is not required and the second gas flow control means is not required. The number of parts of the means is reduced.

[0013] In this configuration, a third gas flow control means for discharging the insulating gas in the puffer chamber to the expansion chamber until the opening gap starts to open at the beginning of the shut-off operation is provided. Is also good. As a result, the pressure in the expansion chamber increases before the opening gap starts to open, so that the small current interruption performance can be improved with small energy.

Further, in such a configuration, a fourth gas flow control means may be provided for communicating the expansion chamber and the closed vessel at the end of the shutoff. As a result, the gas pressure of the expansion chamber becomes equal to the pressure of the closed vessel at the end of the shutoff, so that the circuit breaker after the shutoff operation can be immediately put into a waiting state for closing. Further, in such a configuration, a fifth gas flow control unit that communicates the expansion chamber and the separation gap near the minimum arc time may be provided. As a result, the high-temperature and high-pressure insulating gas from the separation gap flows into the expansion chamber near the minimum arc time, and the gas pressure in the expansion chamber increases, so that the puffer cylinder is pressed against the non-fixed arc contact and is moved to the movable part. A force is applied in a direction to increase the separation gap. For this reason, the reaction force applied to the driving device at the time of interruption is reduced, and the driving device can be smaller than before.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a sectional view showing an internal configuration of a puffer type gas circuit breaker according to an embodiment of the present invention, and shows a closed state of the circuit breaker. First gas flow control means 91
A first concave portion 12 formed on a sliding surface of the inner wall surface of the puffer cylinder 8 with the fixed piston 11;
1 through the opening 70. A radially inward projection 71 is formed at the upper end of the puffer cylinder 8, and the projection 71 slides with the fixed piston 11. Conventionally, the first gas flow control means is shown in FIG.
Although the gas vent valve 43 described in (1) is used, in this embodiment, first gas flow control means 91 as shown in FIG. 1 is used. The rest of FIG. 1 is the same as the conventional configuration of FIG. 31, and the same parts as those of the conventional configuration are denoted by the same reference numerals, and the detailed description is omitted. In the state of FIG.
Since the expansion chamber 30 communicates with the free space 33 through the opening 70, there is no pressure difference between the expansion chamber 30 and the free space 33.

FIG. 2A is a sectional view taken along the line AA of FIG. 1, and FIG. 2B is a sectional view taken along the line BB of FIG. In FIG. 2A, eight first recesses 12 are equally arranged on the inner peripheral surface of the puffer cylinder 8, and the length direction of the first recesses 12 is parallel to the axial direction of the puffer cylinder 8. Is provided. In FIG. 2B, four openings 70 are equally arranged in the circumferential direction of the fixed piston 11.

FIG. 3 shows the maximum arc time T of the circuit breaker of FIG.
It is sectional drawing which shows the state just before _MAX . With the upward movement of the movable part, the separation gap 61 opens, the puffer chamber 8A is gradually reduced, and the expansion chamber 30 expands. Maximum arc time T
Immediately before _MAX , the projection 71 of the puffer cylinder 8 comes to face the opening 70. Diameter a of opening 70
Is formed to be smaller than the vertical width b of the protrusion 71, there is a period in which the protrusion 71 works so as to close the opening 70. Therefore, since the puffer chamber 8A is a closed space except for the blowout hole 60, the shrinkage of the puffer chamber 8A compresses the internal insulating gas, and the compressed insulating gas blows out from the blowout hole 60 to the inside of the insulating nozzle 18. Become like The insulating gas is blown to the arc generated in the separation gap 61, and the arc is cooled. Since the check valve 40 operates even if the expansion chamber 30 expands, the insulating gas in the free space 33 flows in through the check valve 40. Therefore, the expansion chamber 30 does not have a negative pressure.

FIG. 4 shows the maximum arc time T of the circuit breaker of FIG.
It is sectional drawing which shows the state immediately after _MAX . The opening 70 is opposed to the first recess 12 of the puffer chamber 8A, and the insulating gas in the puffer chamber 8A is filled with the first recess 1 as shown by the arrow U.
2 and the flow through the opening 70 to the expansion chamber 30 side, and the pressure in the puffer chamber 8A decreases. Therefore, the force for pushing the movable portion back downward, that is, the reaction force applied to the driving device is reduced. On the other hand, the insulating gas flowing from the puffer chamber 8A stays in the expansion chamber 30 as it is,
And the reaction force applied to the drive device is further reduced.

FIG. 5 is a cross-sectional view showing a state of the circuit breaker of FIG. 1 after the interruption is completed. The shutoff operation ends when the separation gap 61 is separated by a predetermined distance. At the end of the shut-off operation, the gas remaining in the expansion chamber 30 flows out into the closed container via the opening 70 and the blowout hole 60, and the pressure in the expansion chamber 30 becomes the same as that in the free space 33, so that the gas enters a state of waiting for charging. The breaking operation characteristics of the circuit breaker shown in FIG. 1 are almost the same as those of the conventional circuit breaker (FIG. 32). That is, in FIG. 32, when a short-circuit current such as the waveform 57 flows in the AC circuit, when a cutoff command is issued at time T0, the movable portion of the circuit breaker in FIG. , And moves in the direction Y of the blocking state, and the separation gap starts to open at time T1. On the other hand, the pressure of the puffer chamber 9A rises due to the movement of the movable part as indicated by a characteristic 54P, and the insulating gas is blown to the arc in the separation gap 61,
The arc disappears at the zero point of the short-circuit current at time T3. After time T3, the movable part moves further in the Y direction, and the pressure in the puffer chamber 9A decreases, and the shutoff operation is completed at time T4. Further, in the apparatus of Figure 1, the expansion chamber 3 from the maximum arc time T _MAX after as characteristic 54Q
Zero pressure increases. This is because the insulating gas in the puffer chamber 8A enters the expansion chamber 30 through the first recess 12 as described above. The reaction force acting on the driving device due to the increase in the pressure of the expansion chamber 30 becomes smaller. Also, the time T
Up to 3, even though the expansion chamber 30 is expanded, the pressure in the expansion chamber 30 does not become negative as in the characteristic 54Q. This is because the expansion chamber 30 is supplied with gas from the free space 33 through the check valve 40 as the second gas flow control means. As described above, the first gas flow control means 91 including the first recess 12 and the opening 70 performs the same operation as the gas vent valve 43 (FIG. 31) of the conventional circuit breaker. Since the first gas flow control means 91 is formed only by making a dent in the puffer cylinder 8 and making a hole in the fixed piston 11, a gas vent valve is not required, so that the number of parts is reduced and the valves and the like are reduced. Required maintenance will be reduced.

In FIG. 1, the first gas flow control means 91 can be applied to a circuit breaker in which the expansion chamber 30 is not provided. In other words, in which case, the insulating gas in the puffer chamber 8A is released into the free space 33 via the first recess 12 after the maximum arc time T _MAX. Thereby, the reaction force applied to the driving device after the maximum arc time _TMAX can be reduced. On the other hand, the expansion chamber 30
Is provided, the reaction force applied to the driving device can be further reduced.

FIG. 6 is a sectional view showing the internal structure of a puffer type gas circuit breaker according to another embodiment of the present invention.
It shows the closed state of the circuit breaker. The first gas flow control means 92 is provided with the fixed piston 1 on the inner wall surface of the puffer cylinder 8.
1 and a second concave portion 13 formed on a sliding surface of the fixed piston 1 and an opening 73 penetrating the fixed piston 11. A projection 11A is formed radially outward on the lower end of the fixed piston 11 on the fixed arc contact 2 side, and the projection 11A slides on the inner wall of the puffer cylinder 8.
The rest of FIG. 6 is the same as the configuration of FIG. Opening 73
Has a role of a communication hole of the second gas flow control means as described later. 6 is the same as the configuration shown in FIG. 2A except that the first concave portion 12 is replaced with the first concave portion 13, and the DD cross section of FIG. ) Is the same as the configuration in which the opening 70 is replaced with the opening 73. In the state shown in FIG. 6, since the expansion chamber 30 communicates with the free space 33 through the opening 73, there is no pressure difference between the expansion chamber 30 and the free space 33.

FIG. 7 shows the maximum arc time T of the circuit breaker of FIG.
It is sectional drawing which shows the state just before _MAX . With the upward movement of the movable part, the separation gap 61 opens, the puffer chamber 8A is gradually reduced, and the expansion chamber 30 expands. Since the puffer chamber 8A is a closed space except for the blowout holes 60, the shrinkage of the puffer chamber 8A compresses the inside insulating gas, and the compressed insulating gas blows out from the blowout holes 60 to the inside of the insulating nozzle 18. Become. The insulating gas is blown to the arc generated in the separation gap 61, and the arc is cooled. Immediately before the maximum arc time T _MAX , the projection 71 of the puffer cylinder 8 comes to face the opening 73, and the diameter c of the opening 73 is equal to the vertical width b of the projection 71.
Since it is formed larger, the upper end 71
3 will not be completely blocked. When the expansion chamber 30 expands, a negative pressure is almost reached.
The opening 73 and the puffer cylinder 8 which is a movable part as shown in FIG.
And flows into the expansion chamber 30 through the gap 73A between the first and second portions. Therefore, the expansion chamber 30 does not have a negative pressure. Therefore, the opening 73 is a hole-shaped first notch serving as the second gas flow control means.

FIG. 8 shows the maximum arc time T of the circuit breaker of FIG.
It is sectional drawing which shows the state immediately after _MAX . The opening 73 is closed with respect to the free space 33, and communicates with the first recess 13 of the puffer chamber 8A. For this purpose, the insulating gas in the puffer chamber 8 </ b> A
The air flows into the expansion chamber 30 through the opening 3 and the opening 73, and the pressure in the puffer chamber 8A decreases. Therefore, the force for pushing the movable portion back downward, that is, the reaction force applied to the driving device is reduced. On the other hand, the insulating gas flowing from the puffer chamber 8A stays in the expansion chamber 30 as it is,
And the reaction force applied to the driving device is further reduced.

FIG. 9 is a sectional view showing a state of the circuit breaker of FIG. 6 after the termination of the interruption. The shutoff operation ends when the separation gap 61 is separated by a predetermined distance. The gas remaining in the expansion chamber 30 flows into the closed container via the opening 73, the first recess 13, and the blowing hole 60 at the end of the shutoff operation, and
The pressure of 0 becomes the same as that of the free space 33, and it enters a state of waiting for charging.

The breaking operation characteristics of the circuit breaker shown in FIG. 6 are almost the same as those of the conventional circuit breaker (FIG. 32). But the first
The gas flow control means 92 and the second gas flow control means of
Since the puffer cylinder 8 is formed only by forming a recess in the puffer cylinder 8 and drilling a hole in the fixed piston 11, the number of parts is reduced as compared with the case of FIG.
There is no need for any work.

In FIG. 6, the first gas flow control means 92 can also be applied to a circuit breaker in which the expansion chamber 30 is not provided. That is, the insulating gas in the puffer chamber 8A is emitted into free space 33 through the first recess 13 after the maximum arc time T _MAX. Thereby, the reaction force applied to the driving device after the maximum arc time _TMAX can be reduced. On the other hand, the provision of the expansion chamber 30 can further reduce the reaction force applied to the drive device.

FIG. 10 is a cross-sectional view showing the internal structure of a puffer type gas circuit breaker according to still another embodiment of the present invention, and shows a closed state of the circuit breaker. The expansion chamber 30 is formed by being surrounded by the fixed piston 11 and the puffer cylinder 8. Further, a first recess 13 formed on a sliding surface of the inner wall surface of the puffer cylinder 8 with the fixed piston 11, and an opening 72 of the fixed piston 11.
These constitute the first gas flow control means 93.
The opening 72 is not a hole in the embodiment shown in FIGS. 1 and 6 but a part that opens outward in the radial direction of the fixed piston 11. Further, a first cutout portion 14 as a second gas flow control means is provided on a sliding surface of the fixed piston 11 with the puffer cylinder 8. In the first gas flow control means 93 and the second gas flow control means in this embodiment, no valves such as a vent valve and a check valve are used.
The rest of FIG. 10 is the same as the configuration of FIG.

[0028] Figure 11, the maximum A circuit breaker of FIG. 10 - is a cross-sectional view showing a click time T _MAX previous state. Since the movable part moves upward, the separation gap 61 opens, and the puffer chamber 8A is gradually reduced, and the expansion chamber 30 expands. During this time, the lower end 75 of the fixed piston 11 does not face the first recess 13 and slides on the non-dented portion 13A of the inner diameter surface of the puffer chamber 8A. On the other hand, the upper end portion 76 of the puffer cylinder 8 faces the first cutout portion 14, and the gas flow hole 17B
Are formed. Accordingly, since the puffer chamber 8A is a closed space except for the blowout hole 60, the shrinking of the puffer chamber 8A compresses the internal insulating gas, and the compressed insulating gas flows from the blowout hole 60 into the insulating nozzle 18A.
It will blow out inside. The insulating gas is blown to the arc generated in the separation gap 61, and the arc is cooled. On the other hand, even if the expansion chamber 30 expands, the gas flow holes 17B
Since the insulating gas in the free space 33 flows in through
The expansion chamber 30 does not become negative pressure.

[0029] Figure 12, the maximum A circuit breaker of FIG. 10 - is a cross-sectional view showing a click time T _MAX immediately after state. The lower end 75 of the fixed piston 11 faces the first recess 13, and a gas flow hole 17 </ b> A is formed. for that reason,
The insulating gas in the puffer chamber 8A flows to the expansion chamber 30 through the gas flow holes 17A, and the pressure in the puffer chamber 8A decreases.
Thereby, the force for pushing the movable portion back downward, that is, the reaction force applied to the drive device is reduced. On the other hand, since the upper end portion 76 of the puffer cylinder 8 is located at a position where it slides with the portion 16 of the fixed piston 11 having no notch, the insulating gas flowing from the puffer chamber 8A is used as it is.
Stay at 0. For this reason, the pressure in the expansion chamber 30 increases, and the reaction force applied to the drive device is further reduced.

FIG. 13 is a sectional view showing a state of the circuit breaker shown in FIG. 10 after the interruption is completed. Lower end 7 of fixed piston 11
5 faces the first recess 13 and the gas flow hole 17A is still formed. The residual gas in the expansion chamber 30 flows out into the closed container via the gas flow hole 17A and the blowout hole 60, and the pressure in the expansion chamber 30 becomes the same as that in the free space, so that it is in a state of waiting for charging.

The breaking operation characteristics of the circuit breaker shown in FIG. 10 are almost the same as those of the conventional circuit breaker (FIG. 32). The first gas flow control means 93 is provided with a gas vent valve 43 of a conventional circuit breaker.
The same operation as (FIG. 31) is performed. Also, the first notch 1
The second gas flow control means 4 performs the same operation as the check valve 40 (FIG. 31) of the conventional circuit breaker. Therefore,
The first and second gas flow control means in this embodiment are formed by merely providing a recess in the puffer cylinder 8 or notching the fixed piston 11 instead of the conventional valves. And maintenance work is no longer required.

In FIG. 10, the first gas flow control means 93 can also be applied to a circuit breaker in which the expansion chamber 30 is not provided. That is, that case, the second gas flow control means is a waste, the insulating gas in the puffer chamber 8A is emitted into free space 33 through the first recess 13 after the maximum arc time T _MAX. Thereby, the reaction force applied to the driving device after the maximum arc time _TMAX can be reduced. On the other hand, the provision of the expansion chamber 30 can further reduce the reaction force applied to the driving device as described above.

FIG. 14 is a cross-sectional view showing the internal configuration of a puffer type gas circuit breaker according to still another embodiment of the present invention, and shows a closed state of the circuit breaker. A second notch 15 is formed on a sliding surface of the fixed piston 11 with the puffer cylinder 8, and the second notch 15 is formed by a first notch 14
Is provided via a portion 16 which is not cut off. The rest of FIG. 14 is the same as the configuration of FIG.

[0034] Figure 15, the maximum A circuit breaker of FIG. 14 - is a cross-sectional view showing a click time T _MAX previous state. Since the movable part moves upward, the separation gap 61 opens, and the puffer chamber 8A is gradually reduced, and the expansion chamber 30 expands. During this time, the lower end 75 of the fixed piston 11 does not face the first recess 13 and slides on the non-dented portion 13A of the inner diameter surface of the puffer chamber 8A. On the other hand, the upper end portion 76 of the puffer cylinder 8 faces the first cutout portion 14, and the gas flow hole 17B
Are formed. Accordingly, since the puffer chamber 8A is a closed space except for the blowout hole 60, the shrinking of the puffer chamber 8A compresses the internal insulating gas, and the compressed insulating gas flows from the blowout hole 60 into the insulating nozzle 18A.
It will blow out inside. The insulating gas is blown to the arc generated in the separation gap 61, and the arc is cooled. On the other hand, even if the expansion chamber 30 expands, the gas flow holes 17B
Since the insulating gas in the free space 33 flows in through
The expansion chamber 30 does not become negative pressure.

FIG. 16 is a sectional view showing the circuit breaker of FIG. 14 immediately after the maximum arc time _TMAX . The lower end 75 of the fixed piston 11 faces the first recess 13, and a gas flow hole 17 </ b> A is formed. for that reason,
The insulating gas in the puffer chamber 8A flows to the expansion chamber 30 through the gas flow holes 17A, and the pressure in the puffer chamber 8A decreases.
Thereby, the force for pushing the movable portion back downward, that is, the reaction force applied to the drive device is reduced. On the other hand, since the upper end portion 76 of the puffer cylinder 8 is located at a position where it slides with the portion 16 of the fixed piston 11 having no notch, the insulating gas flowing from the puffer chamber 8A is used as it is.
Stay at 0. For this reason, the pressure in the expansion chamber 30 increases, and the reaction force applied to the drive device is further reduced.

FIG. 17 is a sectional view showing a state of the circuit breaker shown in FIG. 14 after the interruption is completed. Lower end 7 of fixed piston 11
5 faces the first recess 13, the gas flow hole 17 </ b> A remains formed, the upper end 76 of the puffer cylinder 8 faces the second cutout 15 of the fixed piston 11, and the gas flow hole 17 </ b> B Is formed. The residual gas in the expansion chamber 30 flows into the closed vessel via the gas flow hole 17B, and the pressure in the expansion chamber 30 becomes the same as that in the free space, so that the state is in a state of waiting for charging. That is, the second notch 15
However, the fourth gas flow control means for communicating the expansion chamber 30 and the closed vessel at the end of the shutoff is formed.

The breaking operation characteristics of the circuit breaker shown in FIG. 14 are almost the same as those of the conventional circuit breaker (FIG. 32). Therefore, the gas flow control means in this embodiment is formed only by providing a recess in the puffer cylinder 8 or notching the fixed piston 11 instead of the conventional valves, so that the number of parts is reduced and maintenance is reduced. No work is required. In the circuit breaker shown in FIG. 14, the residual gas in the expansion chamber 30 flows into the closed vessel via both the gas flow holes 17A and 17B at the end of the shutoff as shown in FIG. It quickly becomes the same as the pressure in free space. For this reason, the circuit breaker provided with the fourth gas flow control means has an advantage that it is quicker to wait for closing after the shutoff is completed.

FIG. 18 is a cross-sectional view showing the internal structure of a puffer type gas circuit breaker according to still another embodiment of the present invention, showing a closed state of the circuit breaker. Exhaust rod 6
The lower end of the exhaust hole 6A penetrates the movable arc contact 4 and communicates with the inside of the insulating nozzle 18. Also, the exhaust hole 6
The opening 20 at the upper end of A is closed by the fixed piston 11. Also, the first of the fixed piston 11
A flow hole 21A penetrating in the notch portion 14 in the radial direction and a flow groove 21C are formed on the inner diameter side of the upper end of the fixed piston 11. The rest of FIG. 18 is the same as the configuration of FIG.

[0039] Figure 19, the maximum A circuit breaker of FIG. 18 - is a cross-sectional view showing a click time T _MAX previous state. The movable part moves upward, the puffer chamber 8A is gradually reduced, and the expansion chamber 30 expands. At the minimum arc time T _MIN , the opening hole 20 and the flow hole 21A communicate with each other, and the high-temperature and high-pressure insulating gas interposed in the separation gap 61 passes through the exhaust hole 6A and the opening hole 20A.
And into the expansion chamber 30 through the communication hole 21A. That is, the opening hole 20 and the flow hole 21A constitute fifth gas flow control means for communicating the expansion chamber 30 and the separation gap 61 near the minimum arc time T _MIN . As a result, the pressure in the expansion chamber 30 increases, and the reaction force of the driving device is reduced.

[0040] Figure 20, the maximum A circuit breaker of FIG. 18 - is a cross-sectional view showing a click time T _MAX immediately after state. The opening hole 20 is closed by the portion 16 of the fixed piston 11 having no notch, and the insulating gas flowing from the puffer chamber 8A stays in the expansion chamber 30 as it is. For this reason, the pressure in the expansion chamber 30 increases, and the reaction force applied to the drive device is further reduced.

FIG. 21 is a cross-sectional view showing a state of the circuit breaker of FIG. 18 after the interruption is completed. The opening hole 20 is opened to the free space 33 via the flow groove 21C. Thereby, the pressure in the exhaust hole 6 </ b> A of the exhaust rod 6 becomes equal to the pressure in the free space 33. On the other hand, the residual gas in the expansion chamber 30 flows into the closed container via the gas flow hole 17A, and the pressure in the expansion chamber 30 becomes the same as that in the free space, so that it is in a state of waiting for charging.

The operating characteristics of the circuit breaker of FIG. 18 are entered in FIG. That is, the characteristic 55S of the dash-dot line, the characteristic 55P of the solid line (same as 54P), and the characteristic 55Q of the dash-dot line.
18 shows the time characteristics of the position of the movable part, the pressure rise in the puffer chamber 8A, and the pressure rise in the expansion chamber 30 of the apparatus shown in FIG. Since the insulating gas from the exhaust hole 6A of the exhaust rod 6 flows into the expansion chamber 30 from the arc time T _{MIN by} the fifth gas flow control means, the pressure of the expansion chamber 30 becomes higher than the characteristic 54Q as shown by a characteristic 55Q. Become. For this reason, the reaction force applied to the driving device is reduced, and the moving speed of the movable portion as shown by the characteristic 55S is higher than that in the case of the characteristic 54S. Thereby, the drive device can be made smaller than before.

FIG. 22 is a cross-sectional view showing the internal structure of a puffer type gas circuit breaker according to still another embodiment of the present invention, and shows a closed state of the circuit breaker. Distribution holes 21A and 21B are formed in the first notch portion 14 and the second notch portion 15 of the fixed piston 11 to penetrate in the radial direction, respectively. The rest of FIG. 22 is the same as the configuration of FIG. FIG.
3, the maximum A circuit breaker of FIG. 22 - is a cross-sectional view showing a click time T _MAX previous state. The movable part moves upward, the puffer chamber 8A is gradually reduced, and the expansion chamber 30 expands. At the minimum arc time T _MIN , the opening hole 20 serving as the fifth gas flow control means and the flow hole 21A communicate with each other, and the high-temperature and high-pressure insulating gas interposed in the separation gap 61 is discharged into the exhaust hole 6A.
And flows into the expansion chamber 30 through the opening hole 20 and the flow hole 21A. As a result, the pressure in the expansion chamber 30 increases, and the reaction force of the driving device is reduced.

[0044] Figure 24, the maximum A circuit breaker of FIG. 22 - is a cross-sectional view showing a click time T _MAX immediately after state. The opening hole 20 is closed by the portion 16 of the fixed piston 11 having no notch, and the insulating gas flowing from the puffer chamber 8A stays in the expansion chamber 30 as it is. For this reason, the pressure in the expansion chamber 30 increases, and the reaction force applied to the drive device is further reduced.

FIG. 25 is a cross-sectional view showing a state after the interruption of the circuit breaker of FIG. 22 is completed. The opening hole 20 is opened to the free space 33 via the communication hole 21B. Thereby, the pressure in the exhaust hole 6 </ b> A of the exhaust rod 6 becomes equal to the pressure in the free space 33. On the other hand, the residual gas in the expansion chamber 30 flows into the closed vessel through both the first recess 13 and the second notch 15, so that the pressure in the expansion chamber 30 quickly becomes the same as that in the free space, and waits for charging. State. That is, the second notch 15 which is the fourth gas flow control means for communicating the expansion chamber 30 with the closed vessel at the end of the shutoff is formed.

The operating characteristics of the circuit breaker of FIG. 22 are the same as those of the circuit breaker of FIG. 18 shown in FIG. That is,
The characteristic 55S of the dash-dot line, the characteristic 55P of the solid line (same as 54P), and the characteristic 55Q of the dash-dot line are the position of the movable part, the pressure rise in the puffer chamber 8A, and the expansion chamber 3 in FIG.
It is a time characteristic of a pressure rise of 0. The insulating gas from the exhaust hole 6A of the exhaust rod 6 is _supplied to the expansion chamber 30 from the arc time T _MIN.
, The pressure in the expansion chamber 30 becomes higher than the characteristic 54Q as indicated by the characteristic 55Q. For this reason, the reaction force applied to the driving device is reduced, and the moving speed of the movable portion as shown by the characteristic 55S is higher than that in the case of the characteristic 54S. Thereby,
The drive device can be made smaller than before.

FIG. 26 is a cross-sectional view showing the internal structure of a puffer type gas circuit breaker according to still another embodiment of the present invention, and shows a closed state of the circuit breaker. A second recess 9 serving as third gas flow control means is provided on a sliding portion of the inner wall of the puffer cylinder that slides with the fixed piston. The second recess 9 is formed above the first recess 13, and has a horizontal cross section in which the first recess 12 is replaced with the second recess 9 in FIG. . An uncut portion 56 is formed between the lower end portion 75 of the fixed piston 11 and the first notch portion 14. The rest of FIG. 26 is the same as the configuration of FIG.

FIG. 27 is a sectional view showing a state immediately before the opening gap of the circuit breaker of FIG. 26 is opened. Until the separation gap is opened at the beginning of the shut-off operation, the puffer chamber 8A and the expansion chamber 30 communicate with each other through the gap of the second recess 9.
On the other hand, since the upper end portion 76 of the puffer cylinder 8 is located at a position where it slides with the portion 56 of the fixed piston 11 having no notch, the side of the expansion chamber 30 opposite to the puffer chamber 8A is closed.
Therefore, the insulating gas compressed in the early stage of the shutoff operation of the puffer chamber 8A flows through the gap of the second recess 9 as shown by the arrow R, and the pressure of the expansion chamber 30 rises.

[0049] Figure 28, the maximum A circuit breaker of FIG. 26 - is a cross-sectional view showing a click time T _MAX previous state. As the movable part moves upward, the separation gap starts to open, and the puffer chamber 8A is gradually reduced and the expansion chamber 30 expands. During this time, the lower end 75 of the fixed piston 11 does not face the first recess 13 and slides only on the non-dented portion 13A of the inner diameter surface of the puffer chamber 8A. On the other hand, the upper end 76 of the puffer cylinder 8 faces the first notch 14 and
7B is formed. Therefore, since the puffer chamber 8A is a closed space except for the blowing hole 60, the insulating gas is compressed by the reduction of the puffer chamber 8A, and the compressed insulating gas is blown out from the blowing hole 60 into the inside of the insulating nozzle 18. Become. The insulating gas has a separation gap 6
1 is sprayed on the arc generated, and the arc is cooled. On the other hand, even if the expansion chamber 30 expands, the insulating gas in the free space 33 flows in through the gas flow holes 17B, so that the expansion chamber 30 does not become negative pressure. At this time, since the second recess 9 moves into the expansion chamber 30, the second recess 9 moves.
The depression 9 has no function.

[0050] Figure 29, the maximum A circuit breaker of FIG. 26 - is a cross-sectional view showing a click time T _MAX immediately after state. The lower end 75 of the fixed piston 11 faces the first recess 13, and a gas flow hole 17 </ b> A is formed. for that reason,
The insulating gas in the puffer chamber 8A flows toward the expansion chamber 30 through the gas flow holes 17A, and the pressure in the puffer chamber 8A decreases. Therefore, the force to push the movable part back down,
That is, the reaction force applied to the driving device is reduced. on the other hand,
Since the upper end portion 76 of the puffer cylinder 8 slides with the portion 16 of the fixed piston 11 having no notch, the insulating gas flowing from the puffer chamber 8A stays in the expansion chamber 30 as it is. For this reason, the pressure in the expansion chamber 30 increases, and the reaction force applied to the drive device is further reduced.

FIG. 30 is a cross-sectional view showing a state after the interruption of the circuit breaker of FIG. 26 is completed. Lower end 7 of fixed piston 11
5 faces the first recess 13, the gas flow hole 17 </ b> A remains formed, the upper end 76 of the puffer cylinder 8 faces the second cutout 15 of the fixed piston 11, and the gas flow hole 17 </ b> B Is formed. for that reason,
Since the residual gas in the expansion chamber 30 flows into the closed container via both the first recess 13 and the second notch 15, the pressure in the expansion chamber 30 quickly becomes the same as that in the free space, and is in a state of waiting for charging. become.

FIG. 33 is a characteristic diagram showing characteristics of the breaking operation of the circuit breaker of FIG. The horizontal axis represents time, and the vertical axis represents current, the position of the movable part, and the pressure rise in the puffer chamber or the expansion chamber. A waveform 57 is a short-circuit current flowing from the AC circuit into the circuit breaker. The two-dot chain line characteristic 56S, the solid line characteristic 56P, and the two-dot chain line characteristic 56Q
The position of the movable part of the apparatus shown in FIG.
5 shows the time characteristics of the pressure rise in the expansion chamber 30 and the pressure rise in the expansion chamber 30.
For comparison, the time characteristic of the position of the movable part (characteristic 54S), the time characteristic of the pressure increase of the puffer chamber 8A (characteristic 54P), and the time characteristic of the pressure increase of the expansion chamber 30 (characteristic 54Q) of the conventional apparatus of FIG. ) Are respectively entered in FIG.
The characteristic 56P and characteristics 54P, and, the time T _MAX after the characteristic 56Q and characteristics 54Q, are almost the same.

In FIG. 33, the characteristic of the device of FIG. 26 differs from that of the conventional device of FIG. 31 in that the pressure in the expansion chamber 30 rises as indicated by the characteristic 56Q at the beginning of the shut-off operation, whereby the movable part The movement speed of the characteristic is 5
It is faster like 6S. This is because, as described with reference to FIG. 27, the insulating gas compressed in the puffer chamber 8 passes through the gap of the second recess 9 serving as the third gas flow control means until the separation gap 61 is opened during the shutoff operation. 3
This is because the pressure flows to 0 as indicated by the arrow R and the pressure in the expansion chamber 30 increases. Thereby, the reaction force applied to the driving device is reduced, and the moving speed of the driving device is increased. In the small current interruption, increasing the operating speed is more effective than increasing the pressure of the insulating gas as compared with the large current interruption. However, FIG.
In the apparatus of the first embodiment, after the maximum arc time T _MAX has passed, the expansion chamber 3
The moving speed of the movable part is increased by increasing the pressure of zero.
Therefore, in order to improve the small current interrupting performance by the apparatus shown in FIG. 22, the driving device itself is further increased in size, and the initial moving speed of the interrupting operation can be increased only by means for increasing the driving operation force itself. A third gas distribution means,
That is, according to the second concave portion 9 of the device of FIG. 26, the moving speed of the interruption can be increased from the initial stage of the interruption operation with small energy, and the driving device can be reduced in size.

FIG. 34 is a cross-sectional view showing the internal structure of a puffer type gas circuit breaker according to still another embodiment of the present invention, showing a closed state of the circuit breaker. Exhaust rod 6
A first concave portion 113 and a second concave portion 90 are formed on an outer diameter surface of the fixed piston 11, and a first notch portion 114 is formed on an inner diameter surface of the fixed piston 11.
And a second notch 115 are formed. Expansion chamber 30
Are formed in a region surrounded by the exhaust rod 6 and the fixed piston 11. The first gas flow control means 94 comprises a first recess 113 and an opening 172 of the fixed piston 11, and the second gas flow control means comprises a first notch 114.
Consists of Further, the third gas flow control means comprises a second recess 90, and the fourth gas flow control means comprises a second notch 115. The rest of FIG. 34 is the same as the configuration of FIG. That is, the only difference between FIGS. 34 and 26 is whether the first concave portion and the second concave portion are formed on the puffer cylinder 8 side or the exhaust rod 6 side. The only difference is whether the first notch and the second notch are also formed on the inner surface of the fixed piston 11 or on the outer surface of the fixed piston 11.

In FIG. 34, the insulating gas compressed in the puffer chamber 8A flows to the expansion chamber 30 through the gap of the second recess 90 until the separation gap is opened at the beginning of the shut-off operation. The pressure starts to rise. Thereby,
The reaction force applied to the driving device is reduced, and the moving speed of the driving device is increased. That is, as in the case of the apparatus shown in FIG. 26, the provision of the second concave portion 90 as the third gas flow means makes it possible to increase the moving speed of the shut-off with a small energy from the beginning of the shut-off operation. Also need to be small.

[0056] Figure 35, the maximum A circuit breaker of FIG. 34 - is a cross-sectional view showing a click time T _MAX previous state. With the upward movement of the movable part, the separation gap 61 opens, the puffer chamber 8A is gradually reduced, and the expansion chamber 30 expands. Up A - until shortly before click time T _MAX, the projection portion 176 of the exhaust rod in surface and slides not formed with the first notch 114 of the fixed piston 11 as shown in FIG. 34. Maximum arc time T
Immediately before _MAX , the protrusion 176 comes to face the first notch 114 as the second gas flow control means. As a result, even if the expansion chamber 30 expands, the insulating gas in the free space 33 flows in through the first notch 114, so that the expansion chamber 30 does not have a negative pressure. On the other hand, since the puffer chamber 8A is a closed space except for the blowout hole 60, the shrinking of the puffer chamber 8A compresses the internal insulating gas, and the compressed insulating gas flows into the blowout hole 60.
From the inside of the insulating nozzle 18. The insulating gas is blown to the arc generated in the separation gap 61, and the arc is cooled.

[0057] Figure 36, the maximum A circuit breaker of FIG. 34 - is a cross-sectional view showing a click time T _MAX immediately after state. The protrusion 175 of the fixed piston 11 comes to face the first recess 113 serving as the first gas flow control means 94, and the insulating gas in the puffer chamber 8A expands through the first recess 113 and the opening 172. It flows to the chamber 30 side, and the pressure of the puffer chamber 8A decreases. Therefore, the force for pushing the movable portion back downward, that is, the reaction force applied to the driving device is reduced. On the other hand, the insulating gas flowing from the puffer chamber 8A stays in the expansion chamber 30 as it is, so that the pressure of the expansion chamber 30 increases,
The reaction force applied to the driving device is further reduced.

FIG. 37 is a cross-sectional view showing a state after the interruption of the circuit breaker of FIG. 34 is completed. The shutoff operation ends when the separation gap 61 is separated by a predetermined distance. The projection 175 of the fixed piston 11 remains facing the first recess 113, and the projection 176 of the exhaust rod 6 faces the second cutout 115 of the fixed piston 11. The residual gas in the expansion chamber 30 flows into the closed container via the first recess 113 and the second cutout 115, and the pressure in the expansion chamber 30 becomes the same as that in the free space 33, and the apparatus is in a state of waiting for charging.
That is, the second notch 11 of the fourth gas flow control means
5 communicates the expansion chamber 30 and the closed container at the end of the shutoff. At the end of the shutoff, the residual gas in the expansion chamber 30 flows out of the second notch 115 into the closed container, so that the expansion chamber 30
Quickly becomes the same as the pressure in free space.

The breaking operation characteristics of the circuit breaker shown in FIG.
This is the same as the characteristic of the device (FIG. 33). That is, FIG.
4 is different from that of the conventional device of FIG.
The pressure of the expansion chamber 30 increases as indicated by a characteristic 56Q at the beginning of the shut-off operation, whereby the moving speed of the movable part is increased by the third gas flow control means as indicated by the characteristic 56S at the beginning of the shut-off operation. It is. Further, it is faster than the conventional case that the fourth gas flow control means enters the state of waiting for charging after the shutoff is completed. Further, the first gas flow control means 94 and the second gas flow control means in this embodiment also do not use any valves such as a vent valve and a check valve. Therefore, the number of parts of the circuit breaker can be reduced, the cost of the device can be reduced, and the labor for maintenance can be saved.

In the circuit breaker shown in FIG. 34, the first to fourth gas flow control means operate independently of each other, so that all of them need not be provided. Further, the circuit breaker shown in FIG. 34 may be provided with the fifth gas flow control means described with reference to FIG. Furthermore, the first recess of the first gas flow control means and the second recess of the third gas flow control means may be formed on the inner diameter surface of the puffer cylinder 8 or the outer diameter of the exhaust rod 6. It may be formed on a surface. Generally, the first recess and the second recess need only be formed on the sliding surface between the fixed piston 11 and the movable portion. Further, the first notch of the second gas flow control means and the second notch of the fourth gas flow control means may also be formed on the outer diameter surface of the fixed piston 11, It may be formed on the inner diameter surface. Generally, the first notch and the second notch may be formed on the sliding surface between the fixed piston 11 and the movable part.

[0061]

As described above, according to the present invention, the first gas flow control means includes a first recess formed in a sliding portion of the inner wall of the puffer chamber with the fixed piston, and a first recess formed in the puffer chamber of the fixed piston. And the opening formed in the sliding portion with the wall, and the puffer chamber is closed by the opening being closed by the wall of the puffer chamber until the maximum arc time, and after the maximum arc time, By reducing the number of parts of the first gas flow control means by causing the insulating gas in the puffer chamber to be released to the fixed piston side by the opening facing the first recess. Thus, the cost of the apparatus can be reduced and the labor for maintenance can be saved.

In this configuration, an expansion chamber surrounded by a movable part and a fixed piston is formed on the side opposite to the puffer chamber of the fixed piston, and the first gas flow control means sets the expansion chamber after the maximum arc time. A second gas flow control means including a first notch portion formed by notching a sliding portion of the fixed piston with the movable portion to discharge the insulating gas of the chamber to the expansion chamber; The second
The gas flow control means communicates the expansion chamber and the closed container through a gap between the first notch portion and the movable portion until a maximum arc time, and closes the gap after the maximum arc time. By blocking the communication between the expansion chamber and the closed vessel, the number of parts of the second gas flow control means can be reduced, thereby reducing the cost of the apparatus and the labor for maintenance. be able to.

[0063] In this configuration, third gas flow control means for releasing the insulating gas in the puffer chamber to the expansion chamber until the opening gap starts to open at the beginning of the shut-off operation is provided. Thereby, the performance improvement of the small current interruption can be realized with small energy, and the size of the circuit breaker and the cost can be further reduced.

Further, in this configuration, a fourth gas flow control means for communicating the expansion chamber and the closed vessel at the end of the shutoff is provided.
The circuit breaker can be brought into a state of waiting for closing immediately after the interruption, and the circuit breaker can be opened and closed at short time intervals. Also,
In this configuration, the drive device can be made smaller by providing fifth gas flow control means for communicating the expansion chamber and the separation gap near the minimum arc time. Thus, it is possible to reduce the size of the circuit breaker and the cost.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an internal configuration of a puffer type gas circuit breaker according to an embodiment of the present invention.

2A is a cross-sectional view taken along a line AA in FIG. 1, and FIG. 2B is a cross-sectional view taken along a line BB in FIG.

FIG. 3 is a sectional view showing a state immediately before a maximum arc time of the circuit breaker of FIG. 1;

FIG. 4 is a sectional view showing a state immediately after the maximum arc time of the circuit breaker of FIG. 1;

FIG. 5 is a cross-sectional view showing a state of the circuit breaker of FIG.

FIG. 6 is a sectional view showing an internal configuration of a puffer type gas circuit breaker according to another embodiment of the present invention.

FIG. 7 is a sectional view showing a state immediately before a maximum arc time of the circuit breaker of FIG. 6;

FIG. 8 is a sectional view showing a state immediately after the maximum arc time of the circuit breaker of FIG. 6;

9 is a cross-sectional view showing a state after the interruption of the circuit breaker of FIG. 6 is completed.

FIG. 10 is a sectional view showing an internal configuration of a puffer type gas circuit breaker according to still another embodiment of the present invention.

FIG. 11 is a sectional view showing a state immediately before the maximum arc time of the circuit breaker of FIG. 10;

FIG. 12 is a sectional view showing a state immediately after the maximum arc time of the circuit breaker of FIG. 10;

FIG. 13 is a cross-sectional view showing a state after the interruption of the circuit breaker of FIG. 10 is completed.

FIG. 14 is a sectional view showing an internal configuration of a puffer type gas circuit breaker according to still another embodiment of the present invention.

FIG. 15 is a sectional view showing a state immediately before the maximum arc time of the circuit breaker of FIG. 14;

16 is a sectional view showing a state immediately after the maximum arc time of the circuit breaker of FIG.

FIG. 17 is a cross-sectional view showing a state after the interruption of the circuit breaker of FIG. 14 is completed.

FIG. 18 is a sectional view showing an internal configuration of a puffer type gas circuit breaker according to still another embodiment of the present invention.

FIG. 19 is a sectional view showing a state immediately before the maximum arc time of the circuit breaker of FIG. 18;

FIG. 20 is a sectional view showing a state immediately after the maximum arc time of the circuit breaker of FIG. 18;

FIG. 21 is a cross-sectional view showing a state after the interruption of the circuit breaker of FIG. 18 is completed.

FIG. 22 is a sectional view showing the internal configuration of a puffer type gas circuit breaker according to still another embodiment of the present invention.

FIG. 23 is a sectional view showing a state immediately before the maximum arc time of the circuit breaker of FIG. 22;

24 is a sectional view showing a state immediately after the maximum arc time of the circuit breaker of FIG. 22;

FIG. 25 is a sectional view showing a state after the interruption of the circuit breaker of FIG. 22 is completed.

FIG. 26 is a sectional view showing an internal configuration of a puffer type gas circuit breaker according to still another embodiment of the present invention.

FIG. 27 is a sectional view showing a state immediately before an opening gap of the circuit breaker in FIG. 26 is opened;

FIG. 28 is a sectional view showing a state immediately before the maximum arc time of the circuit breaker of FIG. 26;

FIG. 29 is a sectional view showing a state immediately after the maximum arc time of the circuit breaker of FIG. 26;

FIG. 30 is a cross-sectional view showing a state of the circuit breaker of FIG. 26 after the interruption is completed.

FIG. 31 is a sectional view showing the internal configuration of a conventional puffer type gas circuit breaker.

FIG. 32 is a characteristic diagram showing characteristics of the device of FIG.

FIG. 33 is a characteristic diagram showing characteristics of the device shown in FIG. 26 during a shut-off operation.

FIG. 34 is a sectional view showing the internal configuration of a puffer type gas circuit breaker according to still another embodiment of the present invention.

FIG. 35 is a sectional view showing a state immediately before the maximum arc time of the circuit breaker of FIG. 34;

FIG. 36 is a sectional view showing a state immediately after the maximum arc time of the circuit breaker of FIG. 34;

FIG. 37 is a cross-sectional view showing a state after the interruption of the circuit breaker of FIG. 34 is completed.

[Explanation of symbols]

2: fixed arc contact, 4: movable arc contact, 6: exhaust rod, 6A: exhaust hole, 20: open hole, 8: puffer cylinder, 8A: puffer chamber, 9, 90: second concave portion,
11: fixed piston, 12, 13, 113: first concave portion, 13A: non-recessed portion, 14, 114: first notched portion, 15, 115: second notched portion, 16: no notched portion Part, 18: insulating nozzle, 20, 70, 72, 7
3,172: opening, 21A, 21B: circulation hole, 21
C: flow groove, 30: expansion chamber, 33: free space, 40: check valve, 43: degassing valve, 60: blowout hole, 61: separation gap, 91, 92, 93, 94: first gas Flow control means, T _MAX : maximum arc time, T _MIN : minimum arc time

Continuation of the front page (72) Inventor Masahiko Fujita 1-1, Tanabe-Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Inventor Nobuyuki Takao 1-1-1, Tanabe-Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Inside Electric Co., Ltd. (72) Inventor Yoichi Kimura 1-1-1, Tanabe-Nita, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture F-term inside Fuji Electric Co., Ltd. 5G001 AA03 AA08 BB03 CC03 DD03 EE03

Claims (5)

[Claims] A fixed arc contact, a movable arc contact that comes into contact with and separates from the fixed arc contact, an exhaust rod fixed to the movable arc contact on a side opposite to the fixed arc contact.
A puffer cylinder provided on the outer peripheral side of the exhaust rod via a puffer chamber, and a fixed piston inserted into the puffer chamber from the anti-fixed arc contact side so as to slide on the puffer cylinder and the exhaust rod. A drive device that is housed in a sealed container with the insulating gas and moves a movable part consisting of a movable arc contact, an exhaust rod, and a puffer cylinder is provided outside the sealed container, and the puffer chamber is closed until the maximum arc time And a first gas flow control means for discharging the insulating gas in the puffer chamber to the fixed piston after the maximum arc time, and when a cutoff command is issued, the driving device moves the movable part to the side opposite to the fixed arc contact. Moving, and the insulating gas in the puffer chamber compressed by the movement of the movable part blows into the gap between the fixed arc contact and the movable arc contact. In a puffer type gas circuit breaker in which an arc generated between the separation gaps is extinguished, the first gas flow control means includes a first recess formed in a sliding portion of a puffer chamber inner wall with a fixed piston, An opening formed in a sliding portion between the fixed piston and the puffer chamber wall, and the puffer chamber is closed by closing the opening with the puffer chamber wall until a maximum arc time. The puffer type gas circuit breaker, wherein the insulating gas in the puffer chamber is discharged to the fixed piston side by the opening facing the first recess after a maximum arc time. 2. The puffer type gas circuit breaker according to claim 1, wherein an expansion chamber surrounded by a movable portion and a fixed piston is formed on a side of the fixed piston opposite to the puffer chamber, and the first gas flow control is performed. Means for releasing the insulating gas in the puffer chamber to the expansion chamber after the maximum arc time, and forming a second notch formed by notching a sliding portion of the fixed piston with the movable portion. Gas flow control means is provided, and the second gas flow control means communicates the expansion chamber and the closed vessel through a gap between the first cutout portion and the movable portion until a maximum arc time. A puffer type gas circuit breaker, wherein communication between the expansion chamber and the closed vessel is interrupted by closing the gap after a maximum arc time. 3. The puffer type gas circuit breaker according to claim 2, wherein an insulating gas in said puffer chamber is discharged to said expansion chamber until said opening gap starts to open at an early stage of a breaking operation. A puffer-type gas circuit breaker characterized in that a means is provided. 4. The puffer type gas circuit breaker according to claim 2, further comprising a fourth gas flow control means for communicating the expansion chamber and the closed vessel at the end of the shutoff. Puffer type gas circuit breaker. 5. A puffer type gas circuit breaker according to claim 2, further comprising a fifth gas flow control means for communicating said expansion chamber and said separation gap near a minimum arc time. A puffer-type gas circuit breaker characterized by being formed.