JP2653502B2 - Gas circuit breaker - Google Patents

Description

[Detailed Description of the Invention] (Object of the Invention) (Industrial application field) The present invention relates to a gas circuit breaker which is used in a substation or switchyard of a power system and has an improved arc-extinguishing chamber.

(Prior Art) As the capacity of a power transmission system increases, the breaking capacity of circuit breakers used in substations and switchyards increases, and high reliability is required. In order to improve the reliability of the circuit breaker, it is important to reduce the number of parts and simplify the structure. Therefore, the number of break points of the circuit breaker has been reduced. Therefore, it is necessary to increase the breaking capacity per point of the circuit breaker. In the conventional general puffer type gas circuit breaker, it is necessary to increase the gas pressure in the puffer chamber in order to enhance the breaking performance.

For example, the 550kV system is currently in practical use with a breaking current of 63kA. Although this 550 kV-63 kA class breaker is configured with four-point breaks, it is important to reduce the number of break points and the number of parts in order to improve the reliability of the breaker. For this purpose, it is necessary to improve the breaking capacity per one breaking point and to cut 550 kV-63 kA into two or one points.

In order to achieve such an improvement in breaking capacity,
What has been used in power transmission systems of 8 kV or more is a so-called puffer-type gas circuit breaker that blows gas into an arc and extinguishes the arc. This has a simple structure of the cut-off part, and has excellent insulation and arc extinguishing performance by the sealed SF ₆ gas. Efficiency In the closed-type gas insulated switching station for insulating the entire apparatus of the substation in SF ₆ gas, it is capable of insulation coordination between the insulating gas circuit breaker and other equipment used, in terms of placement of the device Is particularly well used.

4 and 5 show the structure of a conventional puffer type gas circuit breaker. First, in FIG. 4, a fixed electrode 2 and a movable electrode 3 are provided in a gas tank 1 so as to face each other, and an insulating cylinder 4 is provided so as to surround the outside of the fixed electrode 2 and the movable electrode 3. Conductors 5 and 6 are connected to the fixed electrode 2 and the movable electrode 3, respectively, and a drive mechanism 7 is connected to the movable electrode 3. The movable electrode 3 is attached to the gas tank 1 via a supporting insulating cylinder 10.

Next, details of the arc extinguishing chamber of such a puffer type gas circuit breaker will be described. In FIG. 5, the fixed electrode 2 comprises a fixed arc contact 8 at the center and a cylindrical fixed energizing contact 9 provided outside the fixed arc contact 8 and is formed hollow. On the other hand, the movable electrode 3 includes a puffer piston 11 fixed to the gas tank 1 side, a puffer cylinder 12 sliding on the outside of the puffer piston 11, and a puffer cylinder 12 for connecting the puffer cylinder 12 and the driving mechanism 7. An operation rod 13 inserted into the piston 11. Further, a movable arc electrode 14 that contacts the fixed arc electrode 8 and an insulating nozzle 15 that surrounds the movable arc electrode 14 are provided at the tip of the puffer cylinder 12.

In the conventional gas circuit breaker thus configured, when the operating rod 13 reciprocates by the drive mechanism 7, the movable electrode 3 opens and closes between the movable electrode 3 and the opposing fixed electrode 2 to cut off the current.

Here, FIG. 5 shows a state during the breaking operation. In this state, an arc 16 is generated between the fixed arc electrode 8 and the movable arc electrode 14. When the puffer cylinder 12 moves in the left-right direction by the shutoff operation, and the arc-extinguishing gas is compressed in the puffer chamber 17 formed by the puffer cylinder 12 and the puffer piston 11, the arc-extinguishing gas flow is insulated by the insulating nozzle. The arc 16 is sprayed under the control of 15 to extinguish the arc.

By the way, as one of means for improving the arc extinguishing performance in the puffer-type gas circuit breaker as described above, there is a method of increasing the opening speed. In such a case, the driving force of the driving mechanism must be increased, which results in an increase in the size of the entire device and an increase in cost. On the other hand, there is a method in which the relative opening speed is increased by moving the fixed electrode 2 in the direction opposite to the moving direction of the movable electrode 3 without changing the driving force of the driving mechanism.

FIG. 6 shows a puffer-type gas circuit breaker in which the second movable electrode 23 arranged opposite to the movable electrode 3 (first movable electrode) is moved in the direction opposite to the moving direction of the movable electrode 3 (first movable electrode). Is shown. In addition, the same figure has shown the insertion state.

In this figure, a plurality of insulating rods 29 are arranged on the outer periphery of the puffer cylinder 12 while keeping a constant distance from the puffer cylinder 12. The insulating rod 29 is connected to the operating rod 13 at the end on the operating mechanism side via a link device 18 provided between the insulating rod 29 and the operating rod 13. The link device 18 includes a link support 18d that supports first and second connecting rods 18b, 18c, and 18a that are rotatably connected to both ends of the link 18a. Link 18a
Are rotatably supported by the link support 18d about a fulcrum 18e of the link support 18d set to a predetermined link ratio. Also, the first and second connecting rods 18b, 18c
The operating rod 13 and the insulating rod 29
Is rotatably connected to The link support 18d
Is fixed to an insulating cylinder 19 that is insulated and fixed to a container (not shown).

On the other hand, at the end opposite to the operating mechanism of the insulating rod 29,
A current-carrying cylinder 20 is mounted coaxially with the current-carrying cylinder 20. The current-carrying cylinder 20 is supported and fixed on the side opposite to the operation mechanism.
Slidably operates the current-carrying part 21a. A second movable arc electrode 22 is provided on the operation mechanism side axis of the current-carrying cylinder 20, and constitutes a second movable electrode 23 with the movable electrode 3 (first movable electrode) and an opening / closing operation. . Note that, in the closed state of FIG. 6, the movable electrode 3 (first movable electrode) and the second movable arc electrode 22 are in contact.

In the conventional gas circuit breaker configured as described above, when an operating mechanism (not shown) is operated in the closed state of FIG.
The operating rod 13 is driven at a predetermined speed in the direction of the operating mechanism (rightward in the figure), and the movable electrode 3 (first movable electrode) fixed to the tip moves rightward, and the movable electrode 3 (the first movable electrode) moves with the second movable electrode 23. A shut-off operation occurs between them. On the other hand, with the operation of the operation rod 13, a force is also applied to the first connection rod 18b connected to the operation rod 13 in the same direction, and the force is applied to one end of the link 18a connected to the first connection rod 18b. To move rightward in the figure. In this case, since the fulcrum 18e of the link 18a is fixed, the force applied to one end of the link 18a is
And the link 18a rotates in the same direction as the moment force to rotate the fulcrum 18e in the counterclockwise direction about the fulcrum 18e. Then
Since the other end of the link 18a rotates to the left in the figure, the second connecting rod 18c connected to the same part moves to the left, and the insulating rod 29 connected to this moves to the left. Therefore,
The second movable electrode 23 fixed to the insulating rod 29 moves leftward and separates from the movable electrode 3 (first movable arc electrode),
The state shifts to the open state as shown in FIG. That is, according to the operation of the operation rod 13, both the movable electrode 3 (first movable arc electrode) and the second movable electrode 23 move in the breaking operation direction.

The closing operation is similarly performed by driving the operation rod 13 in the direction opposite to the above-described blocking operation. That is, when the operation rod 13 is driven to the left at a predetermined speed in the cutoff completion state in FIG. 7, the movable electrode 3 (first movable electrode) fixed thereto is moved in the contact direction with the second movable electrode 23. While moving to the left, the link 18a rotates clockwise via the first connecting rod 18b. Thereby, the second
The connecting rod 18c moves rightward, and the insulating rod 29 and the second
The movable electrode 23 moves rightward, which is the direction of contact with the movable electrode 3 (first movable arc electrode).

(Problem to be Solved by the Invention) By the way, the configuration shown in FIGS.
Even if the opening speed is increased, if the driving force is the same, the opening speed of the movable electrode 3 (first movable electrode) is substantially the same as the opening speed of the movable electrode 3 in FIGS. 4 and 5. In this case, the extent to which the arc-extinguishing gas is compressed in the buffer chamber 17 is the same, and the blowing force for blowing the arc 16 is almost the same.

In order to improve the arc-extinguishing performance, it is necessary to increase the blowing force of the arc-extinguishing gas. However, in order to increase the blowing force in the configurations shown in FIGS. 6 and 7, the driving force of the driving mechanism must be increased. However, there is a disadvantage that the entire device becomes large and the cost increases.

The present invention has been made to solve the above-described drawbacks of the prior art, and has an object to improve the arc extinguishing performance and enhance the reliability without increasing the driving force when the circuit breaker breaks. A circuit breaker is provided.

[Structure of the Invention] (Means for Solving the Problems) The gas circuit breaker of the present invention has first and second movable electrodes that can be freely contacted and separated facing each other in a container filled with an arc-extinguishing gas, A first movable electrode and a first puffer cylinder are fixed to one end of an operating rod connected to a driving device, and the first puffer cylinder and a first puffer cylinder that slides in the first puffer cylinder.
A first puffer chamber is formed by the puffer piston, a link device for reversing the direction of the driving force is connected to the operating rod, and the link device and the outer peripheral portion of the second movable electrode are connected by an insulating rod. Fixing the second movable electrode to a second puffer cylinder;
A second puffer chamber is formed in the second puffer cylinder by the second puffer cylinder and a second puffer piston sliding in the second puffer cylinder, and a separating operation of the first movable electrode and the second movable electrode is performed. Accordingly, the arc-extinguishing gas in the first and second puffer chambers is compressed, and the compressed gas is blown to an arc generated between the opposed electrodes.

(Operation) According to the gas circuit breaker of the present invention, when the driving device is driven at the time of shutoff, the driving force is transmitted to the first movable electrode and the first puffer cylinder via the operating rod, and the first puffer chamber is formed. Is compressed. At the same time, a part of the driving force is reversed in direction by the link device connected to the operating rod, and is transmitted to the second movable electrode via the insulating rod. At this time, since the insulating rod is connected to the outer peripheral portion of the second movable electrode, this driving force is transmitted to the second puffer cylinder, and the second puffer cylinder is moved by moving the second puffer cylinder. The second puffer chamber formed by the second puffer piston is compressed. Therefore, at the time of interruption, the arc generated between the first and second movable electrodes is blown with the arc-extinguishing gas from both movable electrode sides.

(Embodiment) Next, an embodiment of the present invention will be specifically described with reference to FIG. 1 and FIG. The same members as those of the conventional gas circuit breaker shown in FIGS. 6 and 7 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, in addition to the configuration shown in FIGS. 6 and 7, the energizing cylinder 20 is used as a second puffer cylinder as shown in FIGS. The second puffer piston which slides inside the inside
27 is provided, and a second puffer chamber 28 is formed in a space between the energizing cylinder 20 and the second puffer piston 27. Further, the second movable arc electrode 22 is provided with an arc-extinguishing gas flow path 31 communicating with the second puffer chamber 28.

The operation of this embodiment having the above configuration will be described. In the closing state as shown in FIG. 1, when the opening operation is started in response to the cutoff command, the operating rod 13 moves in the direction of the driving device (not shown). FIG. 2 shows a state during opening. When the operation rod 13 operates, the first puffer cylinder 12 attached to the operation rod 13 moves in the same direction as the operation rod 13. At the same time, the first puffer chamber 17 formed between the first puffer cylinder 12 and the first puffer piston 11 starts to be compressed.

On the other hand, with the operation of the operation rod 13, the operation rod
A force is also applied to the first connecting rod 18b connected to the first connecting rod 18b in the same direction, and the force is applied to the link 18a connected to the first connecting rod 18b.
And the second connecting rod 18c connected to the link 18a is moved in the opposite direction to the operation rod 13. Accordingly, the insulating rod 29 and the second movable electrode 3 connected thereto, and the energizing cylinder 20 fixed thereto are also moved in the opposite direction to the operation rod 13. At the same time, the arc-extinguishing gas in the second puffer chamber 28 formed between the energizing cylinder 20 forming the second puffer cylinder and the second puffer piston 27 is compressed, and this arc-extinguishing gas flow is moved to the second movable state. The arc 16 is controlled by an arc-extinguishing gas flow path 31 provided in the arc electrode 23 and is blown to the arc 16 to extinguish the arc.

The operation and effect of this embodiment are as follows. When the circuit breaker is shut off, the arc 16 is extinguished by blowing an arc-extinguishing gas to the arc 16, so that the greater the blowing force, the better the arc extinguishing performance. Conventionally,
While the arc-extinguishing gas is sprayed only from the first movable electrode 3 side, in this embodiment, the spraying from the first movable electrode 3 side is performed in addition to the conventional manner, and the second movable electrode 23 side is sprayed. However, since the arc-extinguishing gas is also blown, the blowing force increases.

With such a configuration, according to the present embodiment, it is possible to provide a gas circuit breaker that has improved arc extinguishing performance at the time of shutoff and has a highly reliable shutoff performance.

Another embodiment of the present invention will be specifically described with reference to FIG. FIG. 3 shows the same opening state as in FIG. 2, and the same members are denoted by the same reference numerals and description thereof is omitted.

In the present embodiment, the second movable arc electrode 23 in the configuration shown in FIGS.
A guide 30 is provided so as to surround the second movable arc electrode 23 without providing the same, and a gas flow path 31 is formed between the guide 30 and the second movable arc electrode. The guide 30 may be made of a conductive material or an insulating material as necessary.

The operation of the present embodiment having the above-described configuration is configured between the first puffer cylinder 12 and the first puffer piston 11 when the operation rod 13 operates, as described in FIGS. 1 and 2. The energized cylinder 20, which acts as the second puffer cylinder while compressing the puffer chamber 17, the second
Second puffer chamber 28 formed between puffer pistons 27
And the arc extinguishing gas flow is controlled by the guide 30 and blows against the arc 16 to extinguish it.

Note that the present invention is not limited to the above embodiment, and it is also possible to form a second puffer cylinder separately inside the energizing cylinder 20 and slidably incorporate the second puffer piston inside.

[Effects of the Invention] As described above, in the present invention, since the second puffer cylinder and the second puffer piston are provided,
The arc-extinguishing gas is blown from the second movable electrode side in addition to the first movable electrode side, and the arc-extinguishing performance is improved. Especially,
Since the operation rod for driving the puffer mechanism on the first movable electrode side is linked to the puffer mechanism on the second movable electrode side via the link device, an effect that simple and rational arc extinguishing is achieved.

In addition, by connecting the link device and the outer peripheral portion of the second movable electrode with an insulating rod, the insulating rod serves as an operating rod on the second movable electrode side and corresponds to an operating rod on the second movable electrode side. Since the member to be mounted is disposed outside the second puffer cylinder, the substantial area of the puffer piston can be increased. Therefore, the second puffer cylinder has an effect that it is possible to secure the compressed gas necessary for arc extinction with a shorter overall length than the first puffer cylinder.

[Brief description of the drawings]

1 and 2 are cross-sectional views showing a closed state and a closing operation of a gas circuit breaker according to an embodiment of the present invention, respectively. FIG. 3 is a view for explaining another embodiment of the present invention. Is an external view of a circuit breaker accommodating a conventional puffer type arc extinguishing chamber, FIG. 5 is a sectional view showing a puffer type arc extinguishing chamber, FIG. 6 is a sectional view showing a closed state of a double motion type circuit breaker, FIG. FIG. 7 is a cross-sectional view showing a breaking state of the double motion circuit breaker. 1 ... gas tank, 2 ... fixed electrode, 3 ... movable electrode,
4 ... insulating cylinder, 5, 6 ... conductor, 7 ... drive mechanism, 8 ...
Fixed arc contact, 9: Fixed current-carrying contact, 10: Support insulating cylinder, 11: Puffer piston, 12: Puffer cylinder, 13: Operation rod, 14: Movable arc contact, 15
…… Insulated nozzle, 16 …… Arc, 17 …… Puffer room, 18
…… Link device, 19 …… Insulated cylinder, 20 …… Electrified cylinder, 21…
... Electrification conductor, 22 ... Second movable arc electrode, 23 ... Second
Movable electrode chamber, 24 Second movable shield, 25 Second movable energizing contact, 26 Movable energizing contact, 27 Second puffer piston, 28 Second puffer chamber, 29 Insulation Rod, 30 ... Guide, 31 ... Flow path for arc-extinguishing gas.

Claims (1)

(57) [Claims] 1. An operation in which first and second movable electrodes which can be freely contacted and separated are disposed opposite to each other in a container filled with an arc-extinguishing gas, and the first movable electrode and the first puffer cylinder are connected to a driving device. A first puffer chamber is formed by the first puffer cylinder and a first puffer piston which slides in the first puffer cylinder, the first puffer chamber being fixed to one end of the rod, and the direction of the driving force of the operation rod is reversed. A link device is connected, the link device is connected to an outer peripheral portion of the second movable electrode by an insulating rod, the second movable electrode is fixed to a second puffer cylinder, and the second puffer cylinder and the second The second puffer piston slides in the puffer cylinder to form a second puffer chamber in the second puffer cylinder, and the first and second movable electrodes are separated from each other by the opening operation of the first movable electrode and the second movable electrode. Pa A gas circuit breaker characterized by compressing an arc-extinguishing gas in a buffer chamber and blowing the compressed gas to an arc generated between the opposed electrodes.