JPS643302B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a circuit breaker operating device equipped with an engagement device having a malfunction prevention function for reliably maintaining the disconnected state of a power circuit breaker.

[Background of the invention]

There are various configuration examples of power circuit breaker operating devices for circuit-opening drive devices and circuit-closing drive devices, including those that use accumulated spring force as the drive source, those that use fluid pressure such as high-pressure air or oil pressure, and others. Various combinations of the above have been proposed.

Generally, in order to open or cut off the circuit at high speed, the driving force of the circuit-opening drive device is set to be several to ten times larger than the driving force of the circuit-closing drive device. By the way, the operating device is provided with an engagement device to mechanically hold this state when the circuit breaker finishes opening operation, and when closing the circuit, the engagement device is released from the engagement state, and the drive device for closing the circuit is released. In the operating device configured to close the circuit breaker,
If the engagement device does not operate normally, it may repeatedly turn on and off, resulting in malfunction.

Fig. 1 shows an example of a _buffer type gas circuit breaker equipped with the above-mentioned type of operating device. A movable part 4 having a movable contact 3 facing 2 is housed therein. The fixed contact 2 is supported within the tank 1 by an insulating cylinder 2a, and a terminal is led out from the tank 1 via a bushing 2b. A puff cylinder 4a of the movable part 4 is fitted into a puff piston 4c supported within the tank 1 by an insulating cylinder 4b, and the other terminal is led out of the tank 1 via a bushing 4d. The movable part 4 is operatively connected to a drive shaft 7 via an insulated operating rod 5 and an L-shaped lever 6, and a closing spring is provided on one side of the drive shaft 7 to always bias the movable part 4 in the closing direction. 8. Dash pots 8a and the like are arranged to alleviate the shock during the shutoff operation. The other end of the drive shaft 7 is connected to a shaft 10a of a piston 10 that fits into a cylinder 11 of the shutoff drive device 9. The illustrated shutoff drive device 9 is operated by a high-pressure air source, and high-pressure air is supplied into the cylinder 11 from an air tank 13 filled with high-pressure air via a solenoid valve 12a, a pilot valve 12b, and a main valve 12c. It is configured to charge and exhaust air. FIG. 1 shows a state in which the circuit breaker is closed, and in this state, the main valve 12c opens to the atmosphere and the cylinder 1
1 is brought to atmospheric pressure, and the closed circuit state is maintained by the spring force of the closing spring 8.

If a shutoff command or an open circuit command is issued in this state, the solenoid valve 12a is energized and the pilot valve 12
b, and this pilot valve 12b
The main valve 12c is switched to be communicated with the air tank 13 through the switch, and high pressure air is instantly supplied into the cylinder 11, thereby pushing down the piston 10 against the closing spring force. By this operation, the movable contact 3 of the interrupting section is separated from the fixed contact 2, and the compressed arc extinguishing gas in the puffer cylinder 4a is blown onto the arc, completing the interrupting. At the final stage of these series of operations, the link 1 of the engagement device 14 is connected to the piston 10 as shown in FIG.
The roller 14b at the end 4a engages with the fan-shaped link 17, and the hook 16 that maintains the engagement of the fan-shaped link 17 engages with the groove 15a of the armature 15. In addition, in the state where the shutoff is completed, the solenoid valve 12
a returns, and along with this, the pilot valve 12b,
The main valve 12c also returns to the state shown in Fig. 1, and the cylinder 1
The high pressure air in the main valve 12c is discharged into the atmosphere. However, even if the high-pressure air in the cylinder 11 is discharged, the piston shaft 10a is maintained in the blocked state by the engagement of the engagement device 14. In addition, 20 is an electromagnet that attracts the armature 15 and releases the engagement between the armature 15 and the hook 16 in response to a closing command, and 17c, 15b, and 16a are the fan-shaped links 17, the armature 15, and the hook 16, respectively.
A tension spring 30 rotates and biases the circuit breaker in the counterclockwise direction, and 30 is a contact that is linked to the breaking and closing of the circuit breaker. When the circuit breaker is closed, the B contact is closed, and when the circuit breaker is closed, the A contact is closed. By the way, in the operating device configured as described above, if for some reason the drive shaft 7 does not stroke to the final breaking process during the breaking operation, the engaging device 14 is not engaged and the closing spring force causes the circuit breaker to close again. If the power supply is turned on and a state such as an accident occurs in the power system, the cutoff operation will be performed again by a tripping command, and there is a risk that the same operation will be repeated. Possible causes of this problem include wear of the hook 16 or the groove 15a of the armature 15, or foreign matter getting into the dashpot 8a.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a circuit breaker operating device which eliminates the drawbacks of the prior art described above and is capable of reliably maintaining the disconnection state even in the event of a failure in which the disconnection operation does not reach the final stage.

[Summary of the invention]

In order to achieve this object, the present invention connects the engagement device to a first drive-side engager 16 that engages with the first fixed-side engager 15 in response to a cutoff operation of the drive system of the operating device. Then, the first drive-side engager 1 is activated by excitation of the coil 20 or 20' by the closing command.
6, and the first fixed side engager 15 operates to release the engagement with the first drive side engager 16 and the first fixed side engager 15 in the optimum process of the interrupting operation in which the contactor is almost completely disengaged. The first engaging device 14 engages with the side engaging element 15 to maintain the disconnected state, and engages with the second fixed side engaging element 22 or 15' in response to the disconnecting operation of the drive system of the operating device. The second drive-side engager 10
or 16', and the second driving side engager 10 is activated by excitation of the coil 19 or 20' by the closing command.
Alternatively, the second fixed side engager 22 or 15' operates to release the engagement with the first drive side engager 16 and the first fixed side engager 15' in the final process of the cutoff operation. The second drive-side engager 10 or 16' and the second fixed-side engager 22 or 15' engage prior to the engagement of the first drive-side engager 16 and the first drive-side engager 16 in the closing operation. A second engagement in which the second drive-side engager 10 or 16' and the second fixed-side engager 22 or 15' are disengaged prior to engagement and disengagement of the fixed-side engager 15. combining device 1
8 or 18'.
Note that when the second engagement device maintains the disconnected state, it is desirable to configure a suitable detection device to detect and notify this state. Further, when maintaining the disconnected state with the second engagement device, the closing command may be locked, or the engagement of the second engagement device may not be released even if the closing command is input.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 3 to 5. Note that in FIGS. 3 to 5, the same reference numerals as in FIGS. 1 and 2 indicate the same or equivalent parts.

The embodiment shown in FIG. 3 illustrates a case where a conventional engagement device 14 is used as a first engagement device, and a second engagement device 18 is attached to the cylinder 11 of the shutoff drive device 9. This second engagement device 18 includes a second hook 22 that passes through the cylinder 11 in an airtight manner, and
A compression spring 21 that always urges the second hook 22 to protrude into the cylinder 11, and a hook release coil 19 to which a command given to the electromagnet 20 of the first engagement device 14 at the time of a closing command is given almost simultaneously.
It is composed of. The hook 22 protrudes to a position slightly in front of the position of the piston 10 in the normal shutoff completion state, and has an end surface that allows the piston 10 to move beyond this during the shutoff operation, and has a surface in the direction of the closing operation. It is sloped to prevent this. Figure 3 shows the state in which the circuit breaker has completed shutting off normally, and the corresponding closing circuit is as shown in Figure 5, where the release coil 1
9, RC, tripping electromagnets 20a, 52c, free tripping relay 24, Tf b contact (normally closed contact) 2
3b, it is brought into a non-energized state via a control switch 25 that gives a tripping command. In addition, there is a free trip relay 24, a contact 30 that interlocks Tf with the circuit breaker.
It is connected to the control switch 25 through a parallel circuit of a contact (normally open contact) 30a and a self-holding contact (normally open contact) 23a. Now, if a closing command is input in this state, the control switch 25 will close, and the release coil 19, RC, coil 20a,
52c is energized, the armature 15 of the first engagement device 14 is attracted by the electromagnet 20, and the armature 15 of the first engagement device 14 is pulled out of engagement with the hook 16, which is rotated counterclockwise by the tension spring 16a and the fan-shaped lever 1
7 is also rotated counterclockwise by the tension spring 17c, and is disengaged from the link 14a. Furthermore, the hook 22 on the second engagement device 18 side is also moved back against the compression spring 21 by the release coil 19, so that the piston 10 moves upward and completes the required closing operation. When the circuit breaker has completed closing, the A contact (normally open contact) 30a of the contact 30 is closed, and the free trip relay 24, Tf is instantly energized, self-held by the contact 23a, and the contact 23b is closed. Released, the release coil 19 and electromagnet 20 are demagnetized, so that the hook 22 and armature 15 return to their original positions. Next, when a cutoff command or opening command is received and a cutoff operation is performed, the first
If the engagement device does not operate normally, the piston 10
As the pressure acting on the drive shaft 7 decreases, the drive shaft 7 tries to move in the closing direction again, but at this time, the coil 19 of the second engagement device 18 does not have a closing command, so the hook 22 remains in its original position and the hook 22 The piston 10 engages with the valve to reliably prevent injection.

FIG. 4 shows another embodiment of the present invention, in which the hook that engages with the fan-shaped lever 17 and the armature that opposes the hook are double constructed. That is, a hook 16' substantially similar to the hook 16 of the first engagement device 14 and an armature 15' substantially similar to the armature 15 are provided, and the first engagement device 14
The engagement groove 15a' of the armature 15' on the side of the second engagement device 18' is formed higher than the armature 15 on the side, so that the hook 16' and the armature 15' are connected before the hook 16 and the armature 15 engage. The engagement position is selected so that the two can be engaged. In addition, the electromagnet 20' is attached to both of these armatures 15, 1.
5' may be provided in common, or may be provided individually for each.

〔Effect of the invention〕

According to the present invention, even if for some reason the operating mechanism does not reach the final shutoff process during the shutoff operation and the first engagement device does not operate, the second engagement device can reliably prevent meaningless reinsertion, and the pump A circuit breaker operating device that can prevent this phenomenon can be provided, and reliability of the circuit breaker can be improved.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an example of the configuration of a buffer type gas circuit breaker, FIG. 2 is a vertical cross-sectional view showing the configuration of a conventional circuit breaker operating device, and FIGS. 3 and 4 are circuit breaker operating devices according to the present invention. FIG. 5 is a vertical sectional view showing different embodiments of the device, and FIG. 5 is a closing operation circuit diagram. 2... Fixed contact, 3... Movable contact, 7...
Drive shaft, 8... Closing spring, 9... Operating device, 10
...Piston, 11...Cylinder, 14...1st
engagement device, 18... second engagement device.

Claims (1)

[Claims] 1. An operating device for operating a circuit breaker equipped with at least one pair of relatively separable contacts, which uses a spring force as the closing operation force, and mechanically engages the circuit breaker against the spring force in the final process of the disconnection operation. The device is configured to maintain a disconnection state by engaging the device, and perform a closing operation by disengaging the engagement device, wherein the engagement device is connected to the disconnection state of the drive system of the operating device. A first drive-side engager that engages with the first fixed-side engager in response to the operation, and a tripping action that causes the first drive-side engager to be disengaged from the first drive-side engager by excitation of a coil by a closing command. a first fixed-side engager, and the first driving-side engager and the first fixed-side engager engage in the final process of the interrupting operation in which the contactor is almost completely separated. a first engagement device that maintains a cutoff state; a second drive-side engagement device that engages with a second fixed-side engagement device in response to a cutoff operation of the drive system of the operating device; a second fixed-side engager that operates by tripping the engagement with the second driving-side engager by excitation of the coil;
In the final process of the cutoff operation, the second drive-side engager and the second fixed-side engager engage prior to the engagement between the first drive-side engager and the first fixed-side engager. and in the closing operation, the second drive-side engager and the second
1. A circuit breaker operating device comprising: a second engagement device by which engagement of a fixed side engagement element is tripped;