JP2000285772A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the entire size of a switchgear by reducing the size of actuators and controlling the circuit parts of switches. SOLUTION: In this switchgear equipped with a plurality of switches 11, 22, 23, actuators 27, 24 separately provided therefor are driven by a single drive part 21 and a drive-force transmission means 27. In this switching device, because it is not necessary to drive the actuators at simultaneously, the use of the single drive part does not lower the functions of the switching device but causes the size of the actuators and control circuit parts therefor to be reduced, and hence the entire size of the switchgear is reduced. The provision for magnet clutches 20, 29 for the respective actuators enables the single drive part to drive the plurality of actuators, and enables adjustment of the actuating force and speed of each actuator. The provision for a backup drive motor 26 can enhance the reliability of the swtichgear.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power switchgear.

[0002]

2. Description of the Related Art Switchgears include circuit breakers, switchgears, disconnectors,
It consists of a ground switch. In this specification, a circuit breaker, a switch, a disconnecting switch, a ground switch, and the like are collectively referred to as switches. Among the switches, a circuit breaker needs to operate a breaking part at high speed in order to block a large current. For that purpose, an operation method for operating the circuit breaker with enormous energy is required, and methods such as hydraulic operation, spring operation, and air operation are employed. In any of these methods, the operating unit is driven by the drive motor to store energy, and the stored energy is instantaneously released to operate the shutoff unit at high speed.

Some switches other than the circuit breaker have a spring-operated operating device, and the operating device is driven by a driving motor to store energy for opening and closing the contacts in the spring. Further, for switches and disconnectors that do not need to be opened and closed at a high speed, there is an electric operation system in which an actuator is directly driven by the power of a driving motor. In recent years, switchgears have been installed underground or on the roof of buildings. Therefore, it is required to reduce the size of the switchgear. However, the size of the main circuit of the switchgear, that is, the current-carrying parts such as the busbars, conductors, and switches, is limited due to the problem of insulation strength. Therefore, it is necessary to reduce the size and weight of the operation device of each switch and the control circuit portion of the operation device.

FIG. 1 shows the structure of a conventional switchgear. The switchgear of FIG. 1 is a gas insulated switchgear (hereinafter referred to as “GIS”), and includes a circuit breaker container 12, a busbar container 14,
And a cable head container 16. An operating device 17 is arranged below the circuit breaker container 12. A drive motor 21 that drives the operation device 17 is stored in the box that stores the operation device 17.

A disconnector 22 and a grounding switch 23 are installed inside the circuit breaker container 12, the busbar container 14, and the cable head container 16, and an operation device 24 is provided outside each container. A drive motor 25 for opening and closing contacts is provided for each operation device 24.

[0006]

In the conventional switchgear described above, a drive motor is used for each operating device of each switch. For this reason, the operating device becomes large. Further, in order to control the drive motor, a control circuit is configured by combining tens of electromagnetic switches and the like. For this reason,
In addition to the increase in the size of the operation device, the volume of the control circuit also increases, making it difficult to reduce the size of the switchgear.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the size of the entire switchgear by reducing the size of the operation device and control circuit of switches.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. The present invention relates to a switching device including a plurality of switches, an operating device provided for each of the plurality of switches, a driving unit such as one drive motor, and a driving unit including the driving unit and each of the operating devices. And a driving force transmitting means for connecting the respective parts.
One drive unit supplements the operating force of the plurality of switches.

In the switchgear, there is no need to operate the operating devices simultaneously. According to the present invention, from this viewpoint, only one drive unit that drives the operation devices of the switches of the switching device is provided as a whole, and the driving devices are connected to each of the operation devices by the driving force transmission unit.
Therefore, the number of drive units is reduced without lowering the function of the switchgear, and the actuator and its control circuit are downsized.
The entire switchgear can be downsized.

In the present invention, each operating device is provided with an electromagnetic clutch, and by turning on / off the electromagnetic clutch, a plurality of operating devices are driven by one driving unit, and simultaneously, the operating force of each operating device is reduced. Large, small, high and low speeds can be adjusted. Further, in the present invention, the driving unit
By dividing the system into two systems, a main drive unit and a backup drive unit, the reliability of the switchgear can be improved. In this case, since the drive unit is downsized as described above, even if a backup drive system is added, it is possible to prevent an increase in the size of the opening / closing device.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the present invention is applied to a GIS will be described with reference to the drawings. The present invention is applicable not only to GIS but also to other types of switchgear. FIG. 2 shows a configuration of the GIS, in which each container constituting the GIS is represented by a cross-section, and devices stored in the container are displayed.

The illustrated GIS comprises a circuit breaker container 12 for storing a circuit breaker 11, a bus container 14 for storing a bus 13,
Cable head container 16 for housing cable head 15
And SF6 gas is sealed in each of the containers 12, 14, and 16 as an insulating gas, and each container forms an independent gas space by separating the containers by an insulating spacer.

An operating device 17 is arranged below the circuit breaker container 12. The operation device 17 may be of any type. In the illustrated example, a breaking spring 18 and a closing spring 19 are used as power sources for moving the breaking portion of the circuit breaker 11 at high speed.
The springs 18 and 19 are charged by rotating the operation shaft. The operating shaft has an electromagnetic clutch 2
0 is provided.

The busbar container 14 and the cable head container 16
The disconnecting switch 22 is installed in the inside, and the grounding switch 23 is installed in the circuit breaker container 12 and the cable head container 16. An operation device 24 for operating the disconnector 22 and the grounding switch 23 is provided outside each container. Although the operation device of the grounding switch 23 in the circuit breaker container 12 is not shown,
It is stored in the operation device 17.

As the operating device 24, a type in which the rotational motion of the operating shaft is directly transmitted to the contact as a rotational force by using a spring, but the rotational motion is converted into a linear motion by using a feed screw to be applied to the contact. The communication type may be used. An electromagnetic clutch 29 is provided on an operation shaft of the operation device 24. As a drive unit, two drive motors of a main drive motor 21 and a backup drive motor 26 are installed in the box of the operation device 17. The backup drive motor 26 operates when the main drive motor 21 becomes inoperable.

The drive motor 21 and the electromagnetic clutches 20 and 29 of the operating devices 17 and 24 are connected by a V-belt 27 as power transmission means. The drive motor 21 and the backup drive motor 26 are also connected by a V-belt 27. The power transmission means includes a V-belt 2
7 is the easiest to use, but timing belts, chains, drive shafts, etc. can also be used. In particular, in the case of an outdoor opening / closing device, by using a metal drive shaft, a cover or the like can be easily formed, and long-term stable environmental resistance can be obtained.

When the electromagnetic clutches 20 and 29 are turned on in the operating devices 17 and 24, the drive shaft of the operating devices 17 and 24 is rotated by the driving motor 21 to drive the contacts. When the electromagnetic clutches 20 and 29 are turned off, the operating devices 17 and 24 are disconnected from the drive motor 21. In the GIS described above, when the desired switches are opened and closed, the electromagnetic clutches 20, 29 of the operating devices 17, 24 are turned on, and the other electromagnetic clutches are turned off, and the drive motor 21 is operated. When the drive motor 21 cannot operate, the backup drive motor 26 is driven. Specific control of the drive motor 21 and the electromagnetic clutches 20 and 29 will be described later with reference to FIG.

In the switching device, there is no need to open and close a plurality of switches at the same time. Thus, only one drive motor 21 can be used to supplement the operating force of the plurality of switches. . In addition, since the backup drive motor 26 is provided so that the backup can be performed when the main drive motor 21 is not operating, the reliability of the switchgear can be improved.

The control circuit of the GIS shown in FIG. 2 will be described with reference to FIG. The control circuit of FIG. 3 shows only control for one circuit breaker 11 and one disconnector 22 for simplicity of description. This control circuit can be variously changed according to the number of switches. When the backup drive motor 26 is provided, the main drive motor 21
Is provided, a circuit is provided for automatically switching from the main use to the backup use when an abnormality occurs.

In the circuit shown in FIG. 3, when a command to the circuit breaker and a command to the disconnector are issued at the same time, the command to the circuit breaker has priority. When the breaking spring 18 and the closing spring 19 finish releasing the energy by closing and closing the circuit breaker 11, the limit switch LS1 is turned on. As a result, the coil CR1 is energized and its contact point CR1a is turned on, so that the coil MC1 is energized and the electromagnetic clutch 20 for accumulating the breaker spring is turned on. At the same time, the drive motor 21 is driven to rotate in the forward direction.

As a result, the operating device 17 is driven by the drive motor 21, and the cut-off spring 18 and the closing spring 19 are charged. When the accumulation of the spring ends, the limit switch L
Since S1 is turned off, the electromagnetic clutch 20 is turned off, and the drive motor 21 stops. Also, while the limit switch LS1 is on, the contact CR1b is kept off, so that the electromagnetic clutch 29 of the operating device 24 of the disconnecting switch 22 does not turn on and the drive motor 21 does not rotate in the reverse direction. .

When the button switch BS1 is pressed as an open command to the disconnector 22, the coil CR2 is energized and its contact CR2a is turned on. Therefore, the coil MC2 is energized and the electromagnetic clutch 29 for the disconnector is turned on. Become. At the same time, the drive motor 21 is driven to rotate in the forward direction. on the other hand,
When the button switch BS2 is pressed as a close command, the coil C
R3 is energized and its contact CR3a is turned on.
The coil MC3 is energized and the electromagnetic clutch 29 is turned on. At the same time, the drive motor 21 is driven to rotate in the reverse direction.

Once the button switch BS1 or BS2 is pressed, the contacts CR3a and CR3a connected in parallel with the button switch BS1 or BS2 are turned on. Therefore, even if the button switch is released, the operation of the disconnector 22 is maintained. continue. When the contact of the disconnector 22 reaches the open position or the closed position,
The limit switch DSAux turns off and the coil CR
Since 2 or CR3 is deenergized, the electromagnetic clutch 29 is turned off, and the drive motor 21 stops.

Also, by inserting the contacts CR3b and CR2b in series with the coils CR2 and CR3, the disconnector 2
While the switch 2 is performing the opening operation or the closing operation, even if the button switches BS1 and BS2 performing the opposite operations are pressed, the coils CR2 and CR3 performing the opposite operations are not simultaneously energized. Further, the contact CR1b of the circuit breaker operating coil CR1 is inserted into the circuit for rotating the drive motor 21 in the reverse direction, thereby preventing the drive motor 21 from rotating in the reverse direction during the operation of the circuit breaker operating device 17. ing.

[0025]

According to the present invention, the overall size of the switchgear can be reduced by reducing the size of the operation device of the switches and the control circuit.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a conventional switching device.

FIG. 2 is a diagram showing a configuration of a switchgear to which the present invention is applied.

FIG. 3 is a diagram showing a configuration of a control circuit used in the switching device of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Circuit breaker 12 ... Circuit breaker container 13 ... Bus bar 14 ... Bus line container 15 ... Cable head 16 ... Cable head container 17 ... Operating device 18 ... Breaking spring 19 ... Making spring 20 ... Electromagnetic clutch 21 ... Drive motor 22 ... Disconnector 23 ... Ground switch 24 ... Operation device 25 ... Drive motor 26 ... Backup drive motor 27 ... V-belt 28 ... Insulating spacer 29 ... Electromagnetic clutch

Claims (3)

[Claims] An opening / closing device including a plurality of switches, an operating device provided in each of the plurality of switches, one driving unit, and a connection between the driving unit and each of the operating devices. And a driving force transmitting means connected to the switching device, wherein one driving unit supplements the operating force of the plurality of switches. 2. Each of the operating devices has an electromagnetic clutch,
2. The opening / closing device according to claim 1, wherein the opening / closing device is connected to the driving force transmission means via the electromagnetic clutch. 3. The switchgear according to claim 1, wherein the drive unit has two systems, a main drive unit and a backup drive unit.