JPH0612648B2 - Circuit breaker operating device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker operating device of a type in which a closing spring is urged by an opening operation of a breaking portion and the urged state is held by an engagement device.

[Background of the Invention]

Generally, the operating device for a circuit breaker uses high-pressure air, high-pressure oil, a spring, or a combination thereof as a drive source. Since the closing operation has a slower speed than the opening operation, a spring is used as a drive source of the closing operation, and the spring is biased by the opening device. The biased spring is held in a state by the engagement device, while the engagement device is disengaged by the closing command, and the closing force of the breaking portion is closed by the released spring force.

An example of such a circuit breaker operating device is shown in FIG. In this example, the high-pressure air of the opening device is used, and the spring is used for the closing device.

A blocking portion having a stator 2 and a mover 3 is formed in the tank 1 filled with sulfur hexafluoride gas, and both ends of this blocking portion are led out by bushings 4. The mover 3 is connected to one end of the insulating operation rod 5. The other end of the insulating operation rod 5 is connected to the link 6 via an airtight portion, and the link 6 is connected to the drive shaft 7. The vertical movement of the drive shaft 7 in the figure is converted by the link 6 to open / close the mover 3.

One end of a spring 8 is connected to one end of the drive shaft 7, and the spring 8 applies a force to the drive shaft 7 upward, that is, in the closing direction of the mover 3. A piston 10 is provided at the other end of the drive shaft 7.
Are connected, and this piston 10 is a cylinder 11
It is slidably fitted inside. A charging chamber A is formed by the piston 10 and the cylinder 11, and by supplying high-pressure air into the charging chamber A, the piston 10
Is driven downward, that is, the mover 3 is driven in the open circuit direction. This opening operation urges the spring 8, and the urging state of the spring 8 is held by the engagement device 9.

This holding state is shown in FIG. One end of a link 24 is connected to the piston 10, and the free end of a lever 25 is connected to the other end of the link 24. The force of the spring 8 acting on the connection point between the link 24 and the lever 25 is the sectoral link 1.
7, acting on the first hook 16 in the directions of the respective arrows, the rotation of the first hook 16 is blocked by the armature 15.

When the holding state of the engagement device 9 is completed,
The trip coil 19 is de-energized, the shut-off valve 12 is returned as shown, the high pressure air in the charging chamber A is discharged, and the communication between the high pressure air tank 13 and the charging chamber A is also blocked. .

For closing operation, the armature 15 is rotated clockwise by energization of the closing coil 18, and the link 2 by the engagement device 9 is operated.
4 is released, and the mover 3 is closed by the spring 8 shown in FIG.

By the way, according to the study by the present inventors, it has been found that an operating device of this kind has a risk of causing a pumping phenomenon in which opening and closing operations are repeated. That is, the engagement device 9
Finally holds the biasing state of the spring 8 by the engagement of the first hook 16 and the armature 15, so if the engagement of the two is not established for some reason, the spring biased by the opening operation is performed. Due to 8, the closing operation is performed at the same time when the high pressure air in the charging chamber A is discharged. Moreover, if the accident of the system to which the circuit breaker is connected is still continuing, further opening operation is performed. In this way, there is a risk of a pumping phenomenon in which the opening / closing operation is repeated.

[Object of the Invention]

An object of the present invention is to provide a circuit breaker operating device that can prevent the above-described pumping phenomenon at an early stage.

[Outline of Invention]

The present invention is provided with an abnormal-time locking device in addition to the above-described engaging device, and the abnormal-time locking device performs the locking operation by detecting the closing operation even when there is no release command, that is, the closing command. It is characterized by doing so. Since such a locking device does not operate if the engaging device is normal, the reliability of the operating device is not deteriorated by attaching the locking device.

The circuit breaker operating device according to the present invention includes a fluid pressure opening device that uses a high-pressure fluid such as high-pressure air or high-pressure oil as a drive source to open the mover of the breaking unit, and a spring to open the mover. It can be configured by including the used spring closing device.

Example of Invention

 The present invention will be described below with reference to embodiments shown in the drawings.

Since the target breaker is the same as that shown in FIG. 1, a different configuration will be mainly described.

FIG. 3 shows the abnormal locking device. First in this example
Although the link 24 shown in the figure is configured to be locked, the link 24 may be configured to be locked at any position as long as it is a transmission mechanism that transmits the opening / closing operation force of the blocking portion.

In the vicinity of the link 24, there is a second rotatable member about the shaft 23a.
The hook 23 is arranged. The rod 22 is coupled to the second hook 23 at a position slightly apart from the shaft 23a, and a downward force is constantly applied to the rod 22 by the spring 20. Therefore, the hook 23 is in the illustrated state, and the counterclockwise rotation is prevented. Link 2
4 is formed with an engaging portion 24a which engages with the hook 23 so as to prevent the link 24 from moving to the left. Since the position of the hook 23 is held by the spring 20, the engaging portion 24a does not engage with the hook 23 in a steady state. The coil 21 is arranged on the outer circumference of the movable shaft 26 engaged with the rod 22, and the energization of the coil 21 drives the rod 22 upward through the movable shaft 26. Therefore, the hook 23 rotates counterclockwise by a predetermined angle. The rotation of the second hook 23 engages with the engaging portion 24a to prevent the link 24 from moving to the left, that is, the closing operation.

The locking device having such a structure can prevent the pumping phenomenon if the coil 21 is excited by detecting the malfunction of the engagement device shown in FIGS. 1 and 2.

Before describing this point, the relationship between the engagement device and the locking device will be described with reference to FIGS.

FIG. 4 shows the middle of the opening operation, and the second hook 23 does not hinder the movement of the link 24. When the operation further proceeds, the open circuit state shown in FIG. 5 is established. In this state, the connection point between the link 24 and the lever 25 is the fan-shaped link 17, the first
Engaged by the amateur 15 via the hook 16,
Even if the high-pressure air in the charging chamber A is discharged, the same state is maintained. Shortly before this state, the engaging portion 24a has passed the second hook 23.

When the engagement device 9 is defective, the second hook 23
6 rotates slightly counterclockwise from the steady state as shown in FIG. 6, and does not hinder the movement of the link 24 in the opening direction, but blocks the movement of the link 24 in the closing direction. Become power. Therefore, even if the engaging device 9 is abnormal, the operating device does not cause the pumping phenomenon.

Next, the excitation of the coil 21 will be described with reference to FIG.

In FIG. 7, 52T is the trip coil 19 of FIG.
52C corresponds to the closing coil 18 of FIG. Each of the terminals 41, 42, 43 is connected to a power source, and the circuit breaker is given an opening command to the terminal 42 and a closing command to the terminal 41. Now, the problem is that even if the opening command is given and the opening operation is performed, the closing operation is immediately performed due to the malfunction of the engagement device 9. Such a situation can be detected as the fact that the circuit is closed even though the closing command is not given. That is, it is possible to detect from the sum condition of the absence of the closing command and the closing of the blocking unit.

In FIG. 7, the left half is the control circuit of the abnormal locking device which is added to the conventional control circuit. Circuit breaker contact 52a,
Reference numeral 52a 'is a contact which is closed when the breaking portion is closed. As shown in FIG. 8, the contact 52a' is closed earlier than the contact 52a when the breaking portion is closed, and the contact is opened when the breaking portion is opened. It opens later than 52a. The contacts 52b and 52b 'of the circuit breaker are contacts that are closed when the breaker is open, and as shown in FIG. . These contact points may be contact points 14 controlled by the movement of the lever 25 as shown in the second example, and may be controlled by the transmission mechanism connected to the mover 3 of the breaking section. The closing relay CX has a trip coil 52C as a closing command.
The contact CX _b , which is normally closed, is opened when the contact CX _b is opened. Further, the relay X has the contacts 52a ', 52
When both b'are closed, they are operated by energization from the terminal 43 to close the normally open contact Xa. However, this relay X does not operate when energized for the time T ₁ shown in FIG. 8, but operates when energized for the time T ₁ . Therefore, the relay X is operated only when the breaking portion is closed, and in other embodiments, the contacts 52a ', 5 are connected.
The series connection circuit of 2b 'can have a contact structure that is closed only during the closing operation. Contact CXb of closing relay CX,
The series connection circuit of the contacts Xa of the relay X includes the contacts 52a ′,
It is connected in parallel with a series connection circuit such as 52b 'to form a self-holding circuit for the relay X. Further, the locking coil LC is connected in series with the contact CXb and the contact Xa. This locking coil LC corresponds to the coil 21 in FIG.

With such a control circuit, when the closing operation of the breaking portion is performed, the relay X is first excited and the contact Xa thereof is closed. There are two types of closing operation of the cutoff portion, one is based on the closing instruction, and the other is caused by the abnormality of the engagement device 9 without the closing instruction. In the former case, the relay CX operates to open the contact CXb, so the relay X does not operate and the locking coil LC is not excited. On the other hand, in the latter case, the relay CX does not operate, thus contact CXb remains closed and the contacts 52a ', 52 b' relay to become at the same time closed state for a time T ₂ as in the FIG. 8 X
Operates and closes the contact Xa. As a result, the locking coil LC is excited, and the alarm circuit can be operated from the terminals 44 and 45 and an error display can be made if necessary. When the locking coil LC is energized, the contacts are contacted as shown in FIG.
52b 'opens, but since there is a self-holding circuit, relay X keeps the same state and continues to excite locking coil LC.

When the locking coil LC is excited, the second hook 23 rotates counterclockwise as shown in FIG. Link 2 in this state
The engaging portion 24a of No. 4 moves to the open circuit position again,
Since the hook 23 has a smooth surface so as not to engage in the same direction, and the force of the link 24 is larger than the force of the locking coil 21, the movement of the link 24 continues to the open position. Due to the malfunction of the engaging device 9, the spring 8 tries to make a closing motion this time, but the second hook 23
Is blocked by the engagement of the engaging portion 24a. The spring 8 acts as a force for rotating the second hook 23 in the counterclockwise direction, but the distance between the engaging portion of the second hook 23 and the shaft 23a is made larger than the distance between the shaft 23a and the link 24. Rotation can be prevented by means of configurations known in the field of seeds.

After the engagement device 9 is repaired, the lever 25 is rotated clockwise, for example, by a drive device (not shown) to move to a position where the engagement by the engagement device 9 is completed, and is connected to the terminal 43 in FIG. The lock coil LC is de-energized by opening a contact (not shown) that is provided or a contact (not shown) connected in a circuit in series with the relay.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, the present invention detects that a closing operation has been performed even if there is no closing command, and locks the engaging portion configured at any position of the transmission mechanism connected to the mover of the breaking portion. , It is possible to prevent the pumping by blocking the operation after the cutoff operation after the reclosing. Moreover, since such an abnormal locking device operates only in the abnormal condition, the reliability of the operating device is not deteriorated by the attached mechanism despite the addition of the new mechanism.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a conventional circuit breaker, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a perspective view of essential parts of a circuit breaker operating device according to an embodiment of the present invention. To FIG. 6 are partial cross-sectional views showing the open state, the open state and the locked state of FIG. 3, and FIG. 7 is a control circuit diagram of the lock device shown in FIG.
The figure is a time chart of the locking device shown in FIG. 20 ... Spring, 21 ... Locking coil, 23 ... Second hook, 2
4 ... Link, 24b ... Engaging portion, 25 ... Lever, CX ... Closing relay, X ... Relay, LC ... Locking coil.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-24719 (JP, A) JP-A-57-7034 (JP, A) Actually open 56-140116 (JP, U) Actual-open Sho-57- 128733 (JP, U)

Claims (2)

[Claims] 1. A fluid-pressure opening device for opening the mover of a shut-off section for urging a spring of a spring closing device for closing the mover, thereby opening the fluid-pressure opening device, the spring closing device, and the mover. First engaging a transmission mechanism coupled to
An operating device for a circuit breaker in which the spring of the spring closing device is held in an urging state by the second engaging device, the second engaging device capable of engaging with an engaging portion provided at an arbitrary position of the transmission mechanism. An abnormal time locking device having a device is provided, and the abnormal time locking device is energized by means for detecting the closing operation of the shutoff portion in the absence of a release command to the first engaging device. An operating device for a circuit breaker, comprising a locking coil, and driving the second engaging device so as to engage with the engaging portion by urging the locking coil. 2. The device according to claim 1, wherein the detecting means includes a contact in a normally closed state that is opened by the release command and a contact in a normally open state that is closed when the shutoff portion is closed. On the other hand, the normally open contact of the relay connected in series and the normally closed contact of the relay are connected in series to the power source, and the detection means is an operating device for circuit breaker electrically connected in series to the locking coil. .