JPS60200432A - Remote control type circuit breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] (1) The present invention relates to a remote control type circuit breaker.

[Background technology]

A remote control circuit breaker is one in which the circuit breaker can be turned on and off by remote signals from a location remote from the breaker installation location. Among these, those that have a configuration in which the reset operation after a trip operation due to an accident such as overcurrent is performed by the off signal of the remote signal (a signal that turns off the circuit breaker) have the following drawbacks. .

That is, if an accident occurs after the circuit breaker is turned on by a remote signal or manually, the circuit breaker trips and disconnects the circuit. After that, if you send an off signal by remote control, the circuit breaker will be reset from the trip state.
Subsequently, when a remote signal is used to send an on signal, the circuit is turned on. However, with remote control, it is difficult to confirm the occurrence of overcurrent, and the remote control may be performed by mistake before the accident has been recovered. Therefore, whether the cause of the accident has been removed (2)
) If the circuit is turned on before the power is turned on, the accident will be recreated, which is dangerous.

[Purpose of the invention]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a remote control type circuit breaker which cannot be turned on until the accident is recovered even if it is remotely controlled.

[Disclosure of the invention]

The present invention is provided with a reset prevention means that is interlocked with the tripping operation of the circuit breaker main body. When an accident occurs and a trip occurs, the cent prevention means is interlocked and cannot be reset even if an off signal is sent after tripping, so it is safe because it will not turn on.

An embodiment of the invention is shown in FIGS. 1 to 8. That is, 2 is a power supply side terminal connected to the main circuit, 3 is a load side terminal, 4 is an auxiliary terminal, and 5 is a remote control terminal. Between terminals 2 and 3, for example, from terminal 2, there is a flexible single lead wire 6. Fixed contact 7. Fixed contact 8. Movable contact (3) Point 9. Movable contact 10. Katori 1st line 11. Frame, bimetal 15. The flexible single lead wire 14 reaches the terminal 3 via the coil 13 of the short circuit detection sensor 12. Here, the short circuit detection sensor 12 detects the plunger 16 in response to a predetermined abnormal current.
The bimetal 15 is configured to bend and thermally move in response to a predetermined overcurrent. This circuit breaker has a circuit breaker main body part A and an electromagnet part B, and the opening/closing/trip mechanism of the main body part A is a trip link 17. Latch link 18. Contact frame 19. Interlocking link 20. It is composed of a handle 21, and the electromagnet section B is composed of a bistable electromagnet device 22.

In the main body A, the trip link 17 is connected to the fixed shaft 2.
Bimetal 15 and short circuit detection sensor 1
2, and is biased in the opposite direction (counterclockwise in FIG. 1) by a return spring 24. The launch link 18 is pivotally supported by a fixed shaft 25, and a hook 26 at the tip faces a locking part 27 of the trip link 17, and has a trip opening force larger than the spring force of the return spring 24 (4). It is biased in the locking direction (clockwise) by the pole spring 28. The contact frame 19 has a shaft 29 at its lower end.
It is connected to the launch link 18 by a shaft 3o at the upper end, and connected to the movable contact 1o and the interlocking link 20 by a shaft 3o, and furthermore, a contact pressure applying spring 31 is interposed between the movable contact 10 and the upper end. The handle 21 is pivotally supported by a fixed shaft 32, connected to the interlocking link 2o by a shaft 33 at the lower end, connected to the plunger 34 of the electromagnetic device 22 by a link 35 at the projecting part, and is connected to the handle 21 by a biasing spring 36. is biased clockwise.

The bistable electromagnet device 22 of the electromagnet section B includes a pair of permanent magnets 37 and 37', and a pair of inner yokes 37a and 3.
7'a, a pair of outer yokes 37b, 37'b and a coil 38 with a permanent magnet 37.37' and yokes 37a, 37'a, 37b, 37'b
The plunger 34 is held in the upper position (FIG. 6) and lower position (FIG. 1) by the coil 38, and is driven in the opposite direction by energizing the coil 38. As shown in FIGS. 3 and 4 (5), the operation circuit for controlling the energization of the coil 38 includes a polarity selector switch 40. Diode D1゜D2
．． It consists of a remote control switch 41 and an AC power source E. Polarity switch 4o and diodes DI, D2
is arranged in a space 47 provided on the axial side of the handle 21 of the breaker main body 1 as shown in FIG. Opening and closing operations are performed with respect to a common fixed contact 51. Although a changeover switch is used as the remote control switch 41, it may be a relay, a thyrist, a transistor, or the like. In this circuit, when the remote control switch 41 is switched to contact a, a unidirectional half-wave rectified current is passed through the diode DI to the coil 38.
The flow drives the plunger 34 in one direction, the handle 21 is interlocked with this, and the driver 48 is moved, so the polarity changeover switch 40 is operated and the contacts are switched to the state shown by the broken line in FIG. 4, and the circuit is activated. opens and electricity stops, but the plunger 34
The stop position of is held by magnets 37, 37'.

When the remote control switch 41 is switched to the contact state, a half-wave rectifier (6) current flows in the opposite direction through the diode D2, causing the plunger 34 and the like to operate in the opposite direction.

In this way, the plunger 34 can be operated in two directions.

52 is a lip lever which is reset prevention means and is provided at a corner of the handle 21 of the breaker body L.

That is, the hole 53 is formed in the breaker body 1, and the hole 53
The bearing formed in the shaft part 5 of the synthetic resin main body 55 is attached to the part 54.
6 is inserted in the axial direction and rotatably attached to the main body 55.
The lower end 57 of the latch link 18 and trip link 17
A spring stopper piece 58 is located between the upper ends of the main body 55 and extends in the rotation direction from the upper end of the main body 55, and a projection 59 is provided at the end of the spring stopper piece 58. Correspondingly, a groove 60 is formed in the hole 53, and a positioning protrusion 61 is formed at a predetermined position of the groove 60. 1 and 2 show the stopper piece 58 of the main body 55.
The protrusion 59 is positioned over the protrusion 61, and the lower end 57 is close to the upper end of the launch link 18. And this main body 55 is the latch link 1
It is pushed and moved by the release action in step 8 and rotates in the direction of arrow P.
(7) As shown in FIG. 7, the protrusion 59 of the stopper piece 58 is in a state overlapping the protrusion 61. At this time, the lower end 57 of the main body 55
is the spring 24 at the upper end of the trip link 17 during the return operation.
However, since the protrusion 59 is engaged with the side of the protrusion 61, the main body 55 maintains its position, holds the trip link 17 in the tripped state, and restricts resetting. Such operation is performed by the return spring 24. Engagement force of stopper piece 58.

This is achieved by setting the opening springs 28 in such a manner that the spring force increases in this order.

Next, the operation of this remote control type circuit breaker will be summarized. That is, the on state is shown in FIGS. 1 and 5 (81). In this case, the launch link 18 is latched to the trip link 17, and the plunger 34 of the electromagnetic device 22 is lowered and held by the magnet 37, 37'. Therefore, the movable contact 10 is in contact with the fixed contact 8.

The off state is shown in FIG. 5 fbl and FIG. 6.

As before, the latch link 18 is latched and the plunger 34 is driven upward (8) by the excitation of the coil 38 and held by the magnet 37,37'. Therefore, the handle 21 rotates counterclockwise from the state shown in FIG. 5(a),
When the interlocking link 20 is pulled to the right in the figure (al), the movable contact 10 rotates around the shaft 29 and opens. Note that the opposite operation is the ON state.

In both cases, the handle 21 or the electromagnetic device 22 is used.

Among the trip states, overcurrent trip is shown in FIG. 5(C) and FIG. 7. That is, the main circuit contacts (8,
9) is in the on state and an overcurrent flows through the electric circuit, the bimetal 15 bends due to self-heating, and then the trip link 17 is pushed and the latch link 18 is released, causing the latch link 18 to rotate. Therefore, the shaft 2 of the contact frame 19
9 moves downward, and since the handle 21 is still held by the plunger 34, the movable contact 9 separates from the fixed contact 8.
The electrical circuit is cut off. Further, since the trip lever 52 is pushed and moved by the release operation of the latch link 18, the trip lever 52 rotates as shown in FIG. 7, and prevents the trip link 17 from returning (9) by the return spring 24. Resetting after tripping occurs when the plunger 34 of the electromagnetic device 22 is moved from that state to the OFF position (by means or remotely), and the movable contact 10 is pulled up by the rotation of the handle 21 and the movement of the interlocking link 20. - The nochi link 18 rotates to the left. However, since the trip link 17 is prevented from returning (FIG. 8), the hook 26 is not latched onto the hook 27 of the trip link 17. Here, when the trip lever 52 is manually rotated to the position shown in Fig. 1 after confirming that the accident has recovered, the trip link 17 returns to its original position and is latched to the launch link 18 by the off operation, completing the reset. It becomes possible to turn on.

A short circuit trip is shown in FIG. 5(d). That is, in the on state, when a short circuit current flows through the electric circuit, the plunger 16 of the short circuit detection 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, thereby releasing the launch link 18, and the movable contact 10 performs the opening operation as described above. 10) However, before the movable contact 10 is opened by such link interlocking, that is, at the same time as the plunger 16 operates, the movable contact 10 is opened by the collar 16 of the forced opening rod extending from the plunger 16.
b locks onto the contact 10 and pulls it toward the movable contact 9
is separated from the fixed contact 8. That is, just before the launch link 18 is tripped, the contact 10 rotates about the shaft 29 in a direction that compresses the contact pressure applying spring 31 and performs an opening operation. The reset operation can be performed by returning the trip lever 52 in the same manner as described above.

In these trip operations, when the launch 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 handle 21 and the ON display plate 66 exposed in the window 65. The trip display is located on the top surface. In addition, 67 is an arc extinguishing device that extinguishes the arc that occurs when a short circuit is opened, 68 is an optional switch that detects tripping operation and sends it to the outside of the breaker, and 6
9 is a detection member that engages with the latch link 18.

With this configuration, unless the trip lever 52 is reset, no attempt is made to turn off either the handle 21 or the electromagnetic device 22 to perform a reset operation. Therefore, it is possible to prevent the battery from being reinjected after recovery from an accident, and safety can be ensured.

In the present invention, the reset prevention means is not limited to the trip lever 52 of the embodiment, but may be configured to turn off the electromagnet drive circuit in conjunction with the I-lip operation of the circuit breaker, and may also be configured to turn off the electromagnet drive circuit in conjunction with the I-lip operation of the circuit breaker. Other portions of the switch, such as means for directly regulating the on-operation of the movable contact, may also be used.

〔Effect of the invention〕

As described above, there is no possibility that the remote control of the present invention will be reproduced, and there is an effect that safety can be ensured.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a circuit breaker to which an embodiment of the present invention is applied in the on state, FIG. 2 is a cross-sectional view showing the I-lip lever, and FIG. figure,
Figure 4 is a remote control operation circuit diagram, Figure 5 is an operation diagram, and Figure 6 is a remote control operation circuit diagram.
7 is a sectional view of the off state, FIG. 7 is a sectional view of the tripped state, and FIG. 8 is a sectional view of the reset inhibited state. A... Circuit breaker main body, B... Remote control electromagnet part, 17... Trip link, 18... Launch link, 24... Return spring, 28... Opening spring, 52
...Trip lever (reset prevention means) (13)

Claims (2)

[Claims] (1) A circuit breaker body that detects abnormal current in the circuit and performs a trip operation as well as off operations including on and reset, and a remote control electromagnet that turns the circuit breaker body on and off. . A remote control type circuit breaker comprising: a circuit breaker body provided with means for blocking a reset operation of the circuit breaker body in conjunction with the tripping operation of the circuit breaker body. (2) The remote control according to claim (1), wherein the reset prevention means is a trip lever that prevents the return operation of the trip link in conjunction with the release operation of the latch link of the circuit breaker main body. type circuit breaker.