JPH0614451B2 - Remote control type circuit breaker - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a remote control type circuit breaker.

[Background technology]

In the conventional remote control circuit breaker, the movable contact can be turned on and off by a manual handle, and the movable contact can be turned on and off by driving an electromagnet by a remote signal. there were.

However, this remote control type circuit breaker can be turned on (off) by a remote signal even if the circuit breaker is turned off with a manual handle, and vice versa even if turned off by a remote signal. Can be turned on (off). Therefore, in the case of maintenance inspection of the load side of the circuit breaker, if it was a normal circuit breaker, it was possible to work safely by turning off the manual handle,
The remote control type circuit breaker was dangerous because the circuit could be turned on by a remote signal during work.

[Object of the Invention]

Therefore, an object of the present invention is to provide a remote control type circuit breaker which enables safe maintenance and inspection of loads.

[Disclosure of Invention]

The circuit breaker of the present invention includes an electromagnet device driven by a remote signal and a movable contactor that is connected to the plunger of the electromagnet device by a link interlocking system and is in an on and off position at both ends in the driving direction of the plunger. And a latch link connected to the link interlocking system of the movable contact and the plunger, and the latch link is detachably latched to release the latch link in association with the operation of the abnormal current detecting means. A trip mechanism having a trip link for opening the movable contact from an ON state by releasing the latch engagement of the latch link, a switch connected in series to a coil drive circuit of the electromagnet device, and this switch Can be turned on and off, and the movable contactor can be operated when the switch is turned off. The latch link released from the trip mechanism is provided with a manual handle that can be driven off and is independent of the opening / closing operation of the movable contact by a remote signal, and the movable contact is turned off by the manual handle. The trip link can be latch-engaged by operating in the operating direction.

According to the configuration of the present invention, since the switch is turned off by the operation of the manual handle portion and the movable contact is opened at the same time,
The electromagnetic contact prevents the movable contact from turning on,
You can safely perform load maintenance and inspection work. On the other hand, when the switch is turned on in the manual handle section, the coil drive circuit is closed, so it is possible to turn on and off the movable contactor by driving the electromagnet device by a remote signal. Not affected by. Further, when the movable contactor is in the ON state, the trip mechanism is tripped by the operation of the abnormal current detection means, and the movable contactor is opened. The reset is performed by operating the movable contactor in the direction in which it is turned off by the manual handle portion, and the latch link is latch-engaged with the trip link.

One embodiment of the present invention is shown in FIGS. That is, 1 is a breaker body, 2 is a power source side terminal connected to the main circuit, 3 is a load side terminal, and 4 and 5 are remote control terminals. Between terminals 2 and 3, one of them, for example, terminal 2, flexible lead wire 6, fixed contact 7, fixed contact 8, movable contact 9, movable contact 10, flexible lead wire 11, mechatrem P, abnormal current detection means To the terminal 3 through the bimetal 15, the flexible lead wire 14, and the coil 13 of the short-circuit sensor 12. Here, the short-circuit sensor 12 of the abnormal current detection means has a structure in which the plunger 16 operates in response to a predetermined abnormal current, and the bimetal 15 is bent and heated in response to a predetermined overcurrent.

The open / close / trip mechanism includes a trip link 17, a latch link 18, and a contactor frame 19, an interlocking link 20, a handle 21, which form the open / close mechanism, which configures the trip mechanism T.
It is composed of a bistable electromagnet device 22. The link interlocking system that connects the electromagnet device 22 and the movable contact 10 is composed of a contactor frame 19, an interlocking link 20, and a drive link portion 21a. The trip link 17 is axially supported by the fixed shaft 23 and faces the bimetal 15 and the movable rod 16a of the plunger 16 of the short-circuit sensor 12, and is biased by the return spring 24 in the facing manner (counterclockwise direction). The latch link 18 is pivotally supported by a fixed shaft 25, a hook claw 26 at the tip end thereof faces the locking portion 27 of the trip link 17, and is biased by a trip opening spring 28 in the locking direction (clockwise direction). ing. The contactor frame 19 has a shaft 29 at the lower end.
Is connected to the latch link 18, and the upper end is connected to the movable contact 10 and the interlocking link 20 by the shaft 30, and the contact pressure imparting spring 31 is interposed between the movable contact 10 and the movable contact 10 at the upper position. As shown in FIG. 4, the handle 21 is composed of a drive link portion 21a and a manual handle portion 21b. The drive link portion 21a is pivotally supported by a fixed shaft 32 and is connected to the interlocking link 20 by a shaft 33 at a lower end thereof. The projecting portion is connected to the plunger 34 of the electromagnet device 22 by a link 35, and the urging spring 36 urges the drive link portion 21a counterclockwise. The manual handle portion 21b is axially supported by the fixed shaft 32 and protrudes from the upper surface of the main body 1 and engages with the drive link portion 21a only in one direction (direction in which the movable contact 10 is turned off). Is provided
It faces the locking portion 21d of the drive link portion 21a. Further, the normally open switch A is provided at the turning position (turned to the ON position) in the opposite direction of the manual handle portion 21b, and by pushing the manual handle portion 21b to the ON side, the switch A is pushed by the projecting piece 21e. Is working to close.

The bistable electromagnet device 22 has a pair of magnets 37, 37 'inner yokes 37a, 37'a, outer yokes 37b, 37'b and a coil 38, and the magnets 37, 37' and the yoke 37 are provided.
The upper and lower positions of the plunger 34 are held by a, 37'a, 37b and 37'b, and the coil 38 is energized to be driven in the opposite direction.

The coil drive circuit for controlling the energization of the coil 38 is the second
As shown in FIG. 3 and FIG. 3, it is composed of a polarity changeover switch 40, diodes D ₁ and D ₂ , a remote control switch 41, the switch A and a series circuit of an AC power source E. The polarity switch 40 and the diodes D ₁ and D ₂ are arranged in a space 47 provided on the axial side of the handle 21 of the circuit breaker body 1 as shown in FIG.
A pair of movable contact plates 49,
50 opens and closes with respect to the common fixed contact 51. Although the remote control switch 41 uses a changeover switch, it may be a relay, a thyristor, a transistor, or the like. In this circuit, when the remote control switch 41 is switched to the contact a while the switch A is on, a unidirectional half-wave rectified current flows through the diode D ₁ into the coil 38 to drive the plunger 34 in one direction. The drive link portion 21a is interlocked,
Since the driving element 48 moves, the polarity changeover switch 40 operates to change the contact to the state shown by the broken line in FIG. 3, the circuit opens and the energization is stopped, but the plunger 34 is held by the magnets 37 and 37 '. When the distant control switch 41 is switched to the contact b, the half-wave rectified current flows in the opposite direction through the diode D _{2 and the} plunger 34 and the like operate in the opposite direction. In this way, the plunger 34 can be operated in two directions. It should be noted that the drive link unit 2 is accompanied by these on / off operations.
Each of the 1a rotates about the fixed shaft 32, but the manual handle portion 21b is frictionally supported by the edge of the hole 1a of the main body 1 regardless of the drive link portion 21a.

Next, the operation of this remote control type circuit breaker will be briefly described. That is, the ON state is shown in FIG. In this case, the latch link 18 is latched by the trip link 17, and the plunger 34 of the electromagnet device 22 descends and is held by the magnets 37 and 37 '.
Therefore, the movable contact 10 is held in contact with the fixed contact 8.

The off state is shown in FIG. Similarly to the above, the latch link 18 is latched, and the plunger 34 is driven upward by the excitation of the coil 38 and held by the magnets 37 and 37 '. Therefore, the drive link portion 21a is the fifth
From the state of FIG. (A), it rotates counterclockwise, pulls the interlocking link 20 to the right of FIG. (A), the movable contact 10 rotates about the shaft 29 to open the pole, and the magnets 37, 37 ' Retained.
The ON operation from the OFF state to the ON state is the opposite operation to the OFF operation. In these, the manual handle portion 21b can only turn off the movable contact 10 from FIG. 1 or FIG. 5 (A) when the switch A is turned off (FIG. 7), and the electromagnet. The device 22 can be turned on and off only when the manual handle portion 21b is tilted to the on position, that is, when the switch A is turned on (FIGS. 1 and 6).

Of the trip states, the overcurrent trip is shown in FIG. 5 (C). That is, when the main circuit contacts (8, 9) are in the ON state and an overcurrent flows in the electric path, the bimetal 15 self-heats to bend and the trip link 17 is gradually pushed to release the latch link 18, thereby releasing the latch. Link 18
Rotates. As a result, the shaft 29 of the contact frame 19 moves downward, and since the drive link portion 21a remains held by the plunger 34, the movable contact 9 separates from the fixed contact 8 and the electric path is cut off. The reset after the trip is when the plunger 34 of the electromagnet device 22 is moved to the off position from that state, and since the movable contact 10 is pulled up by the rotation of the drive link portion 21a and the movement of the interlocking link 20, the latch link 18 is released. The hook claw 26 is rotated to the left, and the hook claw 26 is latched by the hook portion 27 of the trip link 17. Further, by operating the manual handle portion 21b in the direction of turning off the switch A, the drive link portion 21a is rotated to move the interlocking link 20 and pull up the movable contact 10 in the same manner as described above, so that resetting is possible. is there.

A short circuit trip is shown in Figure 5 (D). That is, in the ON state, when a short-circuit current flows in the electric path, the plunger 16 of the short-circuit sensor 12 is attracted. As a result, the movable rod 16a is pushed out and pushes the lower end of the trip link 17, and the trip link 17 rotates, so that the latch link 1
8 is released, and the movable contact 10 is opened as described above. However, before the movable contact 10 is opened by such link interlocking, that is, at the same time as the operation of the plunger 16, the flange 16b of the forced opening rod extending from the plunger 16 is locked to the contact 10 and the movable contact 10 is locked. To move the movable contact 9 away from the fixed contact 8. That is, just before the latch link 18 is tripped, the contact 10 rotates about the shaft 29 as a fulcrum in the direction of compressing the contact pressure applying spring 31 to perform the opening operation. The reset operation is the same as above.

In these trip operations, when the latch link 18 rotates, the display link 62 moves and the display link 63 rotates, and the trip display plate 64 is formed on the upper surface of the manual handle portion 21b and exposed to the window 65a of the cover 65. The trip display is performed on the upper surface of the ON display plate 66.

Further, even if the operation button of the manual trip device 52 is operated, the same trip operation state as described above is obtained and the contacts (8, 9) are opened. In this trip state, the trip link 17 is held in the trip operation state. Therefore, even if the manual handle portion 21b is turned off or the electromagnet device 22 is driven off as described above, the hook claw 26 of the latch link 18 remains. The trip recess 17 is not caught in the catch recess 27 and is not reset. Therefore, the remote control switch 4
Even if 1 is accidentally controlled to turn on and off, the contacts (8, 9)
Is not turned on, and since the manual handle portion 21b is operated and the driver 48 is operated by the operation of the electromagnet device 22, the polarity changeover switch 40 does not constantly energize the coil 38.

Reference numeral 67 is an arc extinguishing device for extinguishing an arc generated when the short circuit is opened, 68 is an optional switch for detecting a trip operation and transmitting it to the outside of the circuit breaker, and 69 is a detection member for engaging with the latch link 18.

With this configuration, when performing maintenance and inspection on the load side of the remote control type circuit breaker, it is sufficient to turn off the movable contact 10 with the manual handle portion 21b as in the case of a normal circuit breaker, and at the same time switch it. Since the coil driving circuit is opened by A, the coil 38 is not excited by the remote signal and thus the circuit is not turned on. Therefore, the work does not become dangerous.

〔The invention's effect〕

As described above, according to the remote control type circuit breaker of the present invention, since the switch is turned off by the operation of the manual handle portion and the movable contact is opened at the same time, the movable contact cannot be turned on by the electromagnet device. The load maintenance work can be done safely. On the other hand, when the switch is turned on in the manual handle section, the coil drive circuit is closed, so it is possible to turn on and off the movable contactor by driving the electromagnet device by a remote signal. Not affected by. Further, when the movable contactor is in the ON state, the trip mechanism is tripped by the operation of the abnormal current detection means, and the movable contactor is opened. The reset is performed by operating the movable contactor in the direction in which the movable contactor is turned off by the manual handle portion, and there is an effect that the latch link is latch-engaged with the trip link.

[Brief description of drawings]

FIG. 1 is a sectional view of a circuit breaker to which an embodiment of the present invention is applied, FIG. 2 is a sectional view in which the sectional position of FIG. 1 is different, FIG. 3 is a remote control drive circuit diagram, and FIG. 4 is a handle. Is an exploded perspective view, FIG. 5 is an operation diagram, FIG. 6 is a sectional view in an off state by remote control, and FIG. 7 is a sectional view in an off state by manual operation. A ... switch, T ... trip mechanism, 10 ... movable contact, 12 ... short circuit sensor for abnormal current detection means, 15 ...
Bimetal of abnormal current detection means, 17 ... Trip link, 18 ... Latch link, 22 ... Electromagnet device, 21
b: Manual handle, 34: Plunger

Claims (1)

[Claims] 1. An electromagnet device in which a plunger is driven by a remote signal, a movable contactor which is connected to the plunger of the electromagnet device by a link interlocking system, and which is turned on and off at both ends in the driving direction of the plunger. A trip link having a movable contact and a latch link connected to the link interlocking system of the plunger, and releasably latching the latch link to release the latch link in association with the operation of the abnormal current detecting means. A trip mechanism for opening the movable contact from an ON state by releasing the latch link from the latch engagement,
A switch connected in series to a coil drive circuit of the electromagnet device, and the switch can be turned on and off, and the movable contact can be driven off when the switch is turned off. The trip handle is provided with a manual handle portion which is independent of the opening / closing operation of the movable contact, and the latch link released from the trip mechanism is operated by the manual handle portion in a direction in which the movable contact is turned off. Remote control type circuit breaker that can be latched to the link.