JPH0568049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a remote control type circuit breaker equipped with means for preventing accidents during maintenance of electrical circuits.

[Background technology]

Remote-controlled circuit breakers can control the moving contacts on and off with a manual handle, and can also be controlled on and off by driving an electromagnet with a remote signal. This is what I did.

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) by a remote signal, and vice versa. However, it can be turned on (off) using the manual handle. Therefore,
When performing maintenance and inspection on the load side of a circuit breaker or disconnector, if it were a normal circuit breaker or disconnector, the work could be done safely by turning off the manual handle.
Remote control type 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]

An object of the present invention is to provide a remote control type circuit breaker that allows maintenance and inspection of loads to be carried out safely.

[Structure of the invention]

The present invention has a trip mechanism having a latch link that is latched to a trip link that is linked to the operation of an abnormal current detection means and is released by the operation of the trip link, and a contact that is supported by the latch link and can be opened by the release operation of the latch link. a movable contact; a manual handle associated with the movable contact for driving the movable contact on and off with the latch link latched to the trip link; and an electromagnetic device in series with the coil of the electromagnetic device; a connected switch, a first switching position for turning the switch on, a second switching position for turning the switch off, and a third switching position for turning the switch off and releasing the latch link. It is equipped with a switching handle.

According to the configuration of this invention, the switching handle is
By operating the switching handle to the third switching position, the movable contact can be opened and closed by operating both the manual handle and the remote signal applied to the electromagnetic device, and by operating the switching handle to the third switching position, the movable contact can be opened and closed by operating the manual handle and the remote signal applied to the electromagnetic device. Since the movable contact cannot be closed by any operation, maintenance and inspection can be performed safely and conveniently.Furthermore, by operating the switching handle to the second switching position, the movable contact can be closed by simply operating the manual handle. Since it can be opened and closed, it is convenient for checking after maintenance.

An embodiment of the invention is shown in FIGS. 1 to 8. That is, the details of this circuit board and disconnector body A are also shown in, for example, Japanese Utility Model Application No. 57-181283. The power supply side terminals 3 are similarly load side terminals, and 4 and 5 are remote signal terminals. Between the terminals 2 and 3, on the other hand, for example, from the terminal 2, the copper stranded wire 6 fixed contact plate 7, the fixed contact 8 and the movable contact 9 serving as the main contacts, the movable contact 10, the copper stranded wire 11, the frame F, the bimetal 15, It reaches the terminal 3 via the copper stranded wire 14 and the coil 13 of the short circuit sensor 12. 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, and constitutes an abnormal current detection means C.

The opening/closing/trip mechanism is a trip link 17,
Latch link 18, contact frame 19, interlocking link 2
0, a manual handle 21, and a bistable polar 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 has a return spring (torsion coil spring) 17a.
is supported by a fixed shaft 23, one end of which is engaged with the frame F, and the other end of which is engaged with a trip, thereby urging the trip link 17 counterclockwise in FIG. The latch link 18 is pivotally supported by a fixed shaft 25 and has a hook 2 at the tip.
6 faces the locking portion 27 of the trip link 17,
Moreover, it is biased in the locking direction (clockwise in FIG. 3) by a trip opening spring (composed of a torsion coil spring 18a similar to the return spring 17a). The contact frame 19 is connected to the latch link 1 by a shaft 29 at its lower end.
8, and is connected to the movable contact 10 and the interlocking link 20 by a shaft 30 at the upper end, and furthermore, a contact pressure applying spring 31 is interposed between the movable contact 10 and the movable contact 10 at the upper end. The manual handle 21 is pivotally supported by a fixed shaft 32, is connected to the interlocking link 20 by a shaft 33 at the lower end, is connected to the plunger 34 of the electromagnetic device 22 by a link 35 at the projecting part, and is connected to the manual handle by a biasing spring 36. 21 in the clockwise direction. The bistable polarized electromagnet device 22 has a pair of magnets 37, 37' and a coil 38. The magnets 37, 37' hold the upper and lower positions of the plunger 34, and the coil 38 is energized to hold the plunger 34 in the upper and lower positions. driven in the direction. 22a, 22
b is a yoke.

The operating circuit for controlling the energization of the coil 38 includes a polarity changeover switch 40, diodes D ₁ and D ₂ , a switch 47, a remote control switch 41, and an AC power source E, as shown in FIG. The polarity switch 40 and the diodes D ₁ , D ₂ are arranged in a space provided in the axial direction of the manual handle 21 of the outer shell 1 of the breaker main body A, as shown in FIG.
The changeover switch 40 consists of a pair of movable contact plates 40a, 40b and a common terminal 40c that are opened and closed by a driver 48 provided on the manual handle 21. Although a general changeover switch is used as the remote control switch 41, it may be a relay, a thyristor, a transistor, or the like. In this circuit, when the remote control switch 41 is switched to contact a while the switch 47 is on, 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 handle 21 is interlocked and the drive element 48 moves, the polarity changeover switch 40 operates and the contacts switch to the state shown by the broken line in FIG.
7, 37'. When remote control switch 41 is switched to contact b, diode D ₂
A half-wave rectified current flows in the opposite direction through the plunger 34, 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.

The switching handle 52 is provided on the shredder outer shell 1 adjacent to the manual handle 21. That is,
A hole 53 is formed in the cutter main body A, and a shaft portion 56 is inserted in the axial direction into a bearing portion 54 formed in the hole 53 and rotatably attached thereto. A spring stopper piece 58 extends in the direction of rotation from the side of the handle 52, facing the upper end, and has a protrusion 59 at its end. Correspondingly, a groove 60 is formed in the hole 53, and positioning protrusions 61, 61' are formed at predetermined positions of the groove 60. On the other hand, the switch 47 (micro switch) is installed next to the frame F through the partition wall 1a.
will be placed. 47a is a lead wire connected in series to the coil 38. An interlocking member (torsion coil spring) 62 is attached to the end of the fixed shaft 25 of the latch link 18.
The winding part 63 is supported, and the pushed end 64 which is one end of the winding part 63 is supported.
is opposed to the lever 65 of the switch 47, and the receiving end 66, which is the other end, is engaged with one of the protrusions 57a, 57b of the operating leg 57 of the switching handle 52. FIG. 6 shows the first switching position of the switching handle 52 that can be operated manually or remotely, with the protrusion 59 of the stopper piece 58 of the switching handle 52 riding over the protrusions 61, 61' (third position). (Figure), the trip is not operating. At this time, the receiving end 64 of the interlocking member 62 is pushed to the left in FIG. 6, so the pushing end 64 pushes the lever 65 of the switch 41 and turns on the switch 47. FIG. 7 shows the second switching position of the switching handle 52 which can only be manually operated, and when operated in the direction of arrow P, the protrusion 59 is moved to the protrusion 61.
Although it is positioned on the protrusion 61' after climbing over it, it is not tripped. At this time, the receiving end 66 of the interlocking member 62 is not pushed, so the returning action of the lever 65 side of the switch 47 (by the return spring inside the switch) rotates the interlocking member 62 clockwise in FIG. The end 66 is the protrusion 57a
The switch 47 is turned off when the switch 47 is positioned on the protrusion 57b. In other words, the operation circuit of the electromagnet 22 is opened and remote operation is no longer possible. 8th
The figure shows a third switching state in which forced switching is performed, in which the switching handle 52 is further rotated in the direction of arrow P and the protrusion 59 of the stopper piece 58 has climbed over the protrusion 61. At this time, the operating leg 57 at the lower end pushes the upper end of the trip link 17 against the return spring 17a to perform the trip operation. Further, since the protrusion 59 of the switching handle 52 engages with the side of the protrusion 61', the switching handle 52 maintains its position, that is, the trip link 17 in the tripped state.
Note that the switch 41 remains off. Conversely, when the switch 41 is rotated to the opposite side, that is, to the original two positions described above, the trip is released and the switch 41 is turned on or off.

Next, we will summarize the operation of this remote control type circuit breaker. That is, the on state is shown in FIG. 4a. In this case, the latch link 18 is latched to the trip link 17,
The plunger 34 of the electromagnetic device 22 has been lowered and is held by the magnets 37, 37', so that the movable contact 19 is in contact with the fixed contact 8.

The off state is shown in Figure 4b. As before, the latch link 18 is latched and the plunger 34 is driven upward by the energization of the coil 38 and held by the magnets 37, 37'. Therefore,
The handle 21 rotates to the left from the state shown in FIG. 4A, pulling the interlocking link 20 to the right in FIG. 4A, and the movable contact 10 rotates around the shaft 29 to open the pole.

Among the trip states, an overcurrent trip is shown in FIG. 4c. That is, when the main circuit contacts 8 and 9 are in the ON state and an overcurrent flows through the 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. do. As a result, the shaft 29 of the contact frame 19 moves downward, and since the handle 21 remains held by the plunger 34, the movable contact 9 separates from the fixed contact 8, and the electric path is finally severed. Resetting after a trip occurs when the plunger 34 of the electromagnetic device 22 is moved to the OFF position from that state, and the movable contact 10 is pulled up by the rotation of the handle 21 and the movement of the interlocking link 20, so the latch link 18 is moved to the left. The hook 26 is latched onto the hook portion 27 of the trip link 17.

The short circuit trip is shown in Figure 4d. That is, in the ON state, when a short circuit current flows through the electric circuit, 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 since the trip link 17 rotates, the latch link 18 is released, and the movable contact 19 performs the opening operation as described above. However, before the movable contact 10 is opened by such link interlocking, that is, at the exact same time as the plunger 16 operates, the collar 16b of the forced opening rod extended by the plunger 16 is engaged with the contact 10. The movable contact 9 is separated from the fixed contact 8 by pulling 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 in a direction in which it is compressed by the contact pressure applying spring 31, thereby performing an opening operation. The reset operation is the same as described above.

In these tripping operations, when the latch link 18 rotates, the display link 70 moves and the display link 71 rotates, causing the trip display plate 72 to open on the ON display plate 74 formed on the upper surface of the handle 21 and exposed in the window 73. A trip display is displayed on the top surface.

Furthermore, even if the switching handle 52 is operated to the third switching position (FIG. 8), the same tripping state as described above will occur, and the contacts 8 and 9 will be in the open state. In this trip state, the trip link 17 is maintained in the trip operation state, so even if the handle 21 is turned off or the electromagnetic device 22 is turned off as described above, the hook 26 of the latch link 18 will not catch the trip link 17. It does not get caught in the recess 27 and is not reset. Therefore, even if the remote control switch 41 is not inadvertently turned on or off, the contacts 8 and 9 will not turn on, and the manual handle 21 will operate due to the operation of the electromagnetic device 22, and the driver 48 will not turn on. Since the polarity changeover switch 40 operates, the coil 38 is not constantly energized.

Note that 75 is an arc extinguishing device that extinguishes an arc generated when a short circuit is opened.

With this configuration, when performing maintenance and inspection on the load side connected to this circuit switch or disconnector, operating the third switching device of the switching handle 52 prevents the circuit from being turned on unexpectedly. can be done safely. Furthermore, if the switching handle 52 is used as a second switching device, it can be operated manually, making it convenient for checking after maintenance, and making maintenance work safer overall.

〔Effect of the invention〕

According to the remote control type circuit breaker of the present invention, by operating the switching handle to the first switching device, the movable contact can be opened and closed by operating both the manual handle and the remote signal applied to the electromagnetic device. In addition, by operating the switching handle to the third switching position, the movable contact cannot be closed by either the manual handle or the remote signal, making maintenance and inspection safe and convenient. By operating the movable contact to the second switching position, the movable contact can be opened and closed simply by operating the manual handle, which is convenient for checking after maintenance.

[Brief explanation of drawings]

FIG. 1 is a side view of an embodiment of the present invention with the cover removed, FIG. 2 is a side view with the partition wall removed, FIG. 3 is a sectional view, and FIG. 4 is an operational diagram.
Fig. 5 is a remote control circuit diagram, Fig. 6 is a partial state diagram showing the first switching position of the switching handle, Fig. 7 is a partial state diagram showing the second switching position, and Fig. 8 is a partial state diagram showing the third switching position. Partial state diagram showing positions C... Abnormal current detection means, 10... Movable contact, 17... Trip link, 18... Latch link, 21... Manual handle, 22... Electromagnetic device, 47... Switch, 52... ...Switching handle.

Claims (1)

[Claims] 1. A trip mechanism having a latch link that is latched to a trip link linked to the operation of the abnormal current detection means and released by the operation of the trip link, and a movable contactor having a contact that is supported by the latch link and can be opened by the release operation of the latch link. a hand handle and an electromagnetic device linked to the movable contact and capable of driving the movable contact on and off with the latch link latched to the trip link; and an electromagnetic device connected in series to the coil of the electromagnetic device. a switch; a switching handle having a first switching position for turning the switch on; a second switching position for turning the switch off; and a third switching position for turning the switch off and releasing the latch link; Remote controlled circuit disconnector with.