JPH02223117A - Gas circuit breaker - Google Patents

Abstract

PURPOSE:To miniaturize an apparatus for a circuit breaker with decreased cutoff points by arranging a resistance contact vertically to a cutoff unit and a resistor, and opening or closing the resistance contact in conjunction with the opening/closing actions of the cutoff unit. CONSTITUTION:The second tank 9 storing a resistor 8 is arranged separately from a main tank 2 storing a cutoff unit 1, a resistance contact 10 is arranged vertically to the cutoff unit 1 in a connecting pipe 6 on the driving device 5 side within connecting pipes connecting both tanks, and the resistance contact 10 driven by a link device 4 connected to the driving device 5. The length of an arc extinguishing chamber can be shortened by the length of the resistance contact, part of the resistor 11 is stored in the tank 2 storing the cutoff unit 1, and the length of the tank storing a pair of resistors can be shortened in a gas circuit breaker with decreases cutoff points of the cutoff unit. Pitches of lead sections 15 and 16 extracted from the main tank 2 of the circuit breaker can be decreased, this the circuit breaker can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Field of Industrial Application) The present invention relates to a gas circuit breaker used in a substation or switchyard of a power system.

(Prior Art) Conventionally, in order to suppress the switching overvoltage of a circuit breaker, especially the closing overvoltage that occurs when the circuit breaker is closed, a resistor closing method in which a resistor is closed in advance of the main contact has been used in power transmission systems of 500 KV or more. It has been adopted in In this case, a link drive device mechanically connected to the main contact is generally employed as means for driving the contact that opens and closes the closing resistor. In addition, circuit breakers equipped with closing resistors, especially SF
Recently, the breaking performance of 6-gas blowing circuit breakers has been significantly improved, and the number of breaking points has been significantly reduced, and even in 500KV systems, circuit breakers with 2 points have appeared, compared to the conventional 4 points.

(Problem to be solved by the invention) By the way, in the conventional gas circuit breaker as described above,
There were issues to be solved as described below. That is, the value of the resistor that suppresses the applied overvoltage is determined based on the insulation coordination level of the power transmission system, the system voltage, the system surge impedance, and the length of the power transmission line, and is not significantly affected by the short circuit capacity. Therefore, even if the performance of the circuit breaker is improved as described above, the closing resistor remains unchanged from the current state. On the other hand, as the number of breaking points decreases significantly, the number of resistive switching contacts also decreases, and the space for the circuit breaker in which these contacts are installed also decreases significantly, making it necessary to efficiently arrange the resistors. ing.

Further, the resistor is generally installed in the same tank in parallel with the interrupter. However, in the case of a circuit breaker that uses SF6 gas spray, if the interrupter interrupts the current, the SF6 gas will
Gas-specific decomposition products are generated.

This decomposition product adheres not only to the interrupter itself but also to the resistor mounted in parallel inside the tank due to gas convection, and as the number of current interrupts increases, the amount deposited in that area also increases. If such decomposition products adhere to the surface of the resistor, the withstand voltage of the resistor's surface decreases, causing a risk of flash shorting, which poses problems such as impairing long-term reliability.

In order to solve these problems, a method has been proposed in which the resistor is installed in a tank different from the tank in which the cutoff section is installed. However, although this method solves the above problems, as the number of breaking points in the high voltage circuit breaker decreases, the length of the resistor becomes longer than the length of the breaking part. The length of the tank housing the gas circuit breaker and the tank housing the shutoff section were unbalanced, and the gas circuit breaker as a whole had the disadvantage that it was impossible to downsize it.

The present invention was proposed to eliminate the above-mentioned drawbacks, and its purpose is to provide a circuit breaker with a reduced number of breaking points.
The object of the present invention is to provide a gas circuit breaker that can realize downsizing of equipment.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a first tank that accommodates a cutoff section and a second tank that accommodates a resistor, which are connected in parallel, and a first tank that accommodates a cutoff section and a second tank that accommodates a resistor. In the gas circuit breaker, the resistance contact is arranged perpendicularly to the breaking part at the joint part of the first tank and the second tank, in which a resistance contact is arranged to switch on and off the current flowing through the resistor. Further, the resistive contact is connected to a drive device that drives the cutoff portion via a link device.

(Function) According to the gas circuit breaker of the present invention, since the resistance contacts are arranged perpendicularly to the circuit breaker and the resistor, it is possible to downsize the device.

(Example) Hereinafter, an example of the present invention will be specifically described based on FIGS. 1 and 2.

In this embodiment, as shown in FIG. 1, a cutoff unit 1, which is a main contact switching section, is housed inside a main tank 2, which is a first tank, together with an insulating gas such as 81 gas. . Further, the operating rod 3 of the shutoff unit 1 is connected to a drive device 5 via a link device 4. Further, the main body tank 2 is connected to a second resistor 8 in which a first resistor 8 is housed at the upper and lower ends of the cutoff unit 1 via connecting pipes 6.7 arranged perpendicularly to the tank 2. is connected to the tank 9. Furthermore, a resistance contact 10 is provided in the connection pipe 6 perpendicularly to the cutoff unit 1 and is connected to the first resistor 8 . Note that this resistance contact 10 is supported by an insulator 13 on the connecting pipe 6, and is connected to the link device 4 on the interrupting unit 1 side.

On the other hand, a second resistor 11 is connected to the opposite side of the shutoff unit 1 from the drive bag device 5, and the first resistor 8 and the second
The resistor 11 is connected to the conductor 1 disposed inside the connecting pipe 7.
Connected via 2.

Note that this conductor 12 is supported by the connecting tube 7 by an insulator 14. Further, the main body tank 2 is formed with openings 15 and 16 in the opposite direction to the connection pipes 6 and 7 for connecting the cutoff section to other devices.

In the gas circuit breaker of this embodiment having such a configuration, opening and closing operations are performed as described below. That is, in the closing state as shown in FIG. 1, when a disconnection command is received and the opening operation begins, the operating rod 3 moves in the direction of the drive device 5. Then, when the operating rod 3 operates, the second
As shown in the figure, the link device 4 starts the breaking operation, and the resistance contact 10 first performs the breaking operation. And resistance contact 1
After 0 is opened, the main contact, the interrupting unit 1, is opened, and the main current is interrupted.

On the other hand, when a closing command is input, the drive device 5 starts the closing operation, the resistance contact 1o comes into contact first through the link device 4, and then the cutoff unit 1 comes into contact.

Therefore, the surge generated at the time of closing is absorbed by the first resistor 8 and the second resistor 11, and the surge generated at the time of closing is suppressed.

As described above, according to this embodiment, a second tank housing the resistor is installed separately from the main tank housing the cutoff unit, and the drive unit side of the connecting pipe connecting both tanks is installed separately. The length of the arc extinguishing chamber can be reduced by the length of the resistance contact by arranging the resistance contact perpendicularly to the interrupting unit in the connection pipe of the In addition, even in a gas circuit breaker with a reduced number of cutoff points in the cutoff unit, by storing a part of the resistor in the tank that houses the cutoff part, the tank that houses the resistor can be shortened. Since the length can be shortened and the pitch of the openings drawn out from the circuit breaker body tank can also be reduced, the circuit breaker can be made smaller, and by extension, the entire gas insulated switchgear can be made smaller.

[Effects of the Invention] As described above, according to the present invention, the resistive contact is arranged perpendicularly to the interrupting part and the resistor, and the resistive contact is configured to open and close as the interrupting part opens and closes. By this simple means, it is possible to realize miniaturization of the device even in a circuit breaker with a reduced number of breaking points.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the gas circuit breaker of the present invention in a closed state, and FIG. 2 is a cross-sectional view showing the gas circuit breaker in a shut-off operation. 1... Shutoff unit, 2... Main tank, 3...
Operation rod, 4... link device, 5... drive device,
6, 7... Connection pipe, 8... First resistor, 9...
Second tank, 10... Resistance contact, 11... Second resistor, 12... Conductor, 13.14... Insulator, 1
5.16... Messaging section.

Claims (1)

[Claims] A first tank housing a cut-off part and a second tank housing a resistor are connected in parallel, and a resistance contact is provided between the cut-off part and the resistor to open and close the current flowing through the resistor. In the gas circuit breaker, the resistive contact is arranged perpendicularly to the interrupting portion at the joint portion of the first tank and the second tank, and the resistive contact is connected to the interrupting portion. A gas circuit breaker characterized in that it is connected to a driving device via a link device.