JPS60200431A - 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] This invention relates to a remote controlled circuit breaker.

[Background technology]

A remote control circuit breaker is one in which a movable contact can be turned on and off with a manual handle, and can also be turned on and off by driving an electromagnet with a remote signal.

However, with this remote control type circuit breaker, even if the circuit breaker is turned off (on) with a manual handle, it can be turned on (off) with a remote signal, and conversely, even if the circuit breaker is turned off (on) with a remote signal, it cannot be turned on with the manual handle. Can be turned on (off). Therefore, when performing maintenance and inspection on the load side of a circuit breaker, with a normal circuit breaker, the work could be done safely by turning off the manual handle.
Remote-controlled circuit breakers were dangerous because there was a risk that the circuit could be turned on by a remote signal during work.

[Purpose of the invention]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a remote control type circuit breaker that allows maintenance and inspection of a load to be carried out safely.

[Disclosure of the invention]

In this invention, the electromagnet can turn on and off the movable contact, but the manual handle part is configured so that the movable contact can only be turned off, and a switch is provided in the on position of the manual handle part to control the coil drive circuit of the electromagnet. It has a closed configuration. When turned off using the manual handle, the circuit is cut off and the switch is also turned off, so the circuit is not turned on by a remote signal, making load maintenance and inspection work safer. On the other hand, when the manual handle is placed in the on position, the coil drive circuit is closed, allowing the main circuit to be turned on and off by a remote signal.

An embodiment of the invention is shown in FIGS. 1 to 7. That is, 1 is the breaker main body, 2 is a power supply side terminal connected to the main circuit, 3 is also a load side terminal, and 4.5 is a remote control terminal. Between the terminals 2 and 3, for example, from terminal 2, a flexible single lead wire 6° fixed contact 7. Fixed contact 8. Movable contact 9. Movable contact 10. Katori 1st line 11. Mecareme P.

Bimetal 15. Flexible lead wire 14. Short circuit sensor 12
The terminal 3G is reached through the coil 13. Here, the short circuit sensor 12 has a structure in which a plunger 16 operates in response to a predetermined abnormal current, and a bimetal 15 bends and heats in response to a predetermined overcurrent.

The opening/closing/trip mechanism includes a trip link 17 that constitutes the trip mechanism T. The latch link 18 and the contact frame 19 that constitutes the opening/closing mechanism. Interlocking link 20, handle 21.
It is composed of a bistable electromagnet device 22. The trip link 17 is pivotally supported by a fixed shaft 23, facing the bimetal 15 and the movable rod 16a of the plunger 16 of the short circuit sensor 12, and is counterclockwise (counterclockwise) by a return spring 24.
is energized by The latch link 18 is pivotally supported by a fixed shaft 25, and a hook 26 at the tip faces a locking portion 27 of the trip link 17, and is biased in the locking direction (clockwise) by a trip opening spring 28. ing. The contact frame 19 is connected to the launch link 18 by a shaft 29 at its lower end, and connected to the movable contact 10 and the interlocking link 2 by a shaft 30 at its upper end.
0, and furthermore, a contact pressure applying spring 31 is interposed between the movable contact 10 and the movable contact 10 at an upper position thereof. Handle 21
As shown in FIG. 4, it consists of a drive link part 21a and a manual handle part 21b, and the drive link part 21a
2, the lower end is connected to the interlocking link 20 by a shaft 33, the protruding part is connected to the plunger 34 of the electromagnet device 22 by a link 35, and the driving link part 21a is rotated counterclockwise by a biasing spring 36. is energized. The manual handle portion 21b is pivotally supported by the fixed shaft 32 and protrudes from the upper surface of the main body 1, and has a retaining portion 21C that engages with the drive link portion 21a only in one direction (the direction in which the movable contact 10 is turned off). is provided and faces the locking portion 21d of the drive link portion 21a. In addition, a normally open switch A is provided at the opposite rotating position (on position) of the manual handle part 21b, and by tilting the manual handle part 21b to the on side, the protrusion 21e pushes the switch A. I am trying to make the closure work.

The bistable electromagnetic device 22 includes a pair of magnets 37.37', inner yokes 37a, 37'a, and outer yoke 37b.

37'b and coil 38, the magnet 37.37'
and yokes 37a, 37'a, 37b, 37'b
The upper and lower positions of the plunger 34 are held by the coil 38, and the plunger 34 is driven in the opposite direction by energizing the coil 38.

As shown in FIGS. 2 and 3, the drive circuit for controlling the energization of the coil 38 consists of a series circuit consisting of a polarity changeover switch 40°, diodes DI, Di, a remote control switch 41°, the switch A, and an AC power source E. There is. The polarity changeover switch 40 and the diodes D, D, are arranged in a space 47 provided on the axial side of the handle 21 of the breaker main body 1 as shown in FIG. A pair of movable contact plates 49 and 50 are connected by a child 48.
open and close with respect to a common fixed contact 51.

The remote control switch 41 uses a changeover switch,
It may also be a relay, thyrisk, transistor, etc. This circuit operates when the switch A is on and the remote control switch 4
1 to contact a, a unidirectional half-wave rectified current flows to the coil 38 through the diode D1, driving the plunger 34 in one direction, and accordingly, the drive link part 21a is interlocked, and the driver 48 is moved. The polarity changeover switch 40 operates and the contacts switch to the state shown by the broken line in FIG.
is maintained by When the old remote control switch is switched to contact, a half-wave rectified 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. Note that, along with these on and off operations, the drive link portions 21a rotate around the fixed shafts 32, respectively.
The manual handle portion 21b is frictionally supported by the edge of the hole 1a of the main body I, independently of the drive link portion 21a.

Next, the operation of this remote control type circuit breaker will be summarized. In other words, the on state is as shown in Figure 5 (
Shown in A). In this case, the launch link 18 is launched into the trip link 17, the plunger 34 of the electromagnetic device 22 is lowered and held by the magnet 37, 37',
Therefore, the movable contact 10 is held in contact with the fixed contact 8.

The off state is shown in FIG. 5(B). As before, the launch link 18 is latched and the plunger 34 is driven upward by the energization of the coil 38 and held by the magnet 37,37'. Therefore, the drive link part 21a rotates to the left from the state shown in FIG. 5(A), pulls the interlocking link 20 to the right in FIG. poles and held by magnets 37, 37'. Note that the ON operation from the OFF state to the ON state is the opposite of the OFF operation. In these cases, the manual handle portion 21b can only be turned off from FIG. 1 or FIG. 5(A) (FIG. 7), and the electromagnetic device 22 has the manual handle portion 21b turned to the on position. On and off are possible only when the switch A is on (FIGS. 1 and 6).

Among the trip states, an overcurrent trip is shown in FIG. 5(C). That is, when the main circuit contact (8°9) is in the ON state and an overcurrent flows through the electrical circuit, the bimetal 15 bends due to self-heating, and gradually the trip link 17 is pushed, the launch link 18 is released, and the launch link 18 is released. Link 18
rotates. Therefore, 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 interrupted. The drop after tripping occurs when the plunger 34 of the electromagnet device 22 is moved from that state to the OFF position, and the latch link 18 is pulled up by the rotation of the drive link portion 21a and the movement of the interlocking link 20. It rotates to the left, and the hooking pawl 26 is latched onto the hooking portion 27 of the trip link 17.

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 sensor 2 is attracted. As a result, the movable rod 16a is pushed out and pushes the lower end of the trip linter 7, and the trip link 17 rotates, so the latch link 18
is released, and the movable contact 1o performs the opening operation as described above.

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 1 of the forced opening rod extending from the plunger 16.
6b engages with the contactor 10 and draws it to separate the movable contact 9 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 is the same 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 a trip display plate 64 is formed on the upper surface of the manual handle portion 21b and exposed through the window 65a of the cover 65. A trip display is displayed on the second side of the ON display board 66.

Furthermore, even if the operation button of the manual trip device 52 is operated, the same trip operation state as described above is brought about, and the contacts (8, 9) are brought into the open state. In this trip state, the trip link 17 is maintained in the trip operation state, so even if the manual handle portion 21b is turned off or the electromagnetic device 220 is turned off as described above, the hooking pawl 26 of the latch link 18 remains in the trip state. The trip link 17 is not caught in the catch recess 27 and is not reset. Therefore, even if the remote control switch 41 is erroneously turned on or off, the contacts (8, 9) will not be turned on, and the manual handle portion 21b will operate due to the operation of the electromagnetic device 22, and the driver 48 will operate. Therefore, the coil 38 is not constantly energized by the action of the polarity changeover switch 40.

In addition, 67 is an arc extinguishing device that extinguishes the arc generated when a short circuit is opened, 68 is an optional switch that detects a tripping operation and transmits it to the outside of the breaker, and 69 is a detection member that engages with the latch link 18.

With this configuration, the circuit can be turned off using the manual handle part 21b in the same way as in the case of a remote-controlled normal circuit breaker, and at the same time the coil drive circuit is opened by switch A, so the coil 3 can be turned off by a remote signal.
8 is never energized and therefore the circuit is never turned on.

1 This prevents the work from becoming dangerous.

〔Effect of the invention〕

As mentioned above, the present invention has the advantage that it can be remotely controlled.

[Brief explanation of the drawing]

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 of a different cross-sectional position from Fig. 1, Fig. 3 is a remote control drive circuit diagram, and Fig. 4 is a handle. FIG. 5 is an operating diagram, FIG. 6 is a cross-sectional view of the off-state by remote control, and FIG. 7 is a cross-sectional view of the off-state by manual control. A...Switch, T...I lip mechanism, 10...
- Movable contact, 22... Electromagnetic device, 21b... Manual handle part 2

Claims (1)

[Claims] A movable contact that opens and closes the contact, a lip mechanism that supports the movable contact, a remote control electromagnet that controls the movable contact to turn on and off, and a unidirectional operation to turn off the movable contact. A remote control type circuit breaker, comprising: a manual handle portion that operates the manual handle portion in the other direction; and a switch that is operated by operating the manual handle portion in the other direction to close a coil drive circuit of the electromagnet.