JPH059892B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] This invention relates to a remote control type circuit breaker.

[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]

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

[Structure of the invention]

The remote control type circuit breaker of the present invention is a remote control type circuit breaker consisting of a circuit breaker main body and a handle device for load inspection, and the circuit breaker main body has a current It has a trip link that is operated by a detection unit and a manual trip lever, and has a latch link that is latched to the trip link and released by the operation of the trip link. It has a main contact that is opened and closed by the operation of an electromagnetic device for remote control and opened by the release operation of the latch link, and the load inspection handle device is manually operated to open and close the contact point only in the direction in which the trip link operates. While pushing the manual trip lever, the manual handle is pushed only in the opening direction, and in the return operation, while the manual trip lever is in the operating position and the manual handle is in the opening position, the manual trip lever and the manual handle are moved. Further, the load inspection handle device is detachably attached to the circuit and disconnector main body.

According to the configuration of the present invention, the main contacts of the circuit and disconnector body can be opened and closed by operating a manual handle or by a remote device of an electromagnetic device. In addition, when the current detecting section detects an abnormal current in the electric circuit or the manual trip lever is operated, the circuit or disconnector main body is tripped, and the main contact is opened. Further, when the load inspection handle device is operated, the manual handle is turned off and the manual trip lever is moved to the trip position. Therefore, the main contact is opened by the manual handle, and the circuit and disconnector body is in a trip state, so even if a remote signal is supplied to the electromagnetic device, the main contact will not open or close, and therefore maintenance of the load will be difficult. Inspections can be performed safely. Moreover, during maintenance and inspection, the manual handle and the manual trip lever can be operated simultaneously by operating the load inspection handle device, resulting in good operability.

An embodiment of the invention is shown in FIGS. 1 to 5. That is, as a whole, a load inspection handle device B is detachably provided on a circuit or disconnection main body A.

First, the circuit and disconnection main body A will be explained.
The details of this circuit and disconnector main body A are given by Jitsuganeaki, for example.
As shown in No. 57-181283, in the figure,
1 is the outer shell that forms the cutter body, 2 is the power supply side terminal connected to the main circuit, 3 is the load side terminal,
4 and 5 are remote control terminals. Between the terminals 2 and 3, for example, from the terminal 2, a copper stranded wire 6, a fixed contact plate 7, a fixed contact 8 and a movable contact 9 that serve as main contacts, a movable contact 10, a copper stranded wire 11, a frame F, and a bimetal 15. , the copper stranded wire 14 and the coil 13 of the short circuit sensor 12 to reach the terminal 3. 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 a current detection section C.

The opening/closing/trip mechanism is a trip link 17,
Latch link 18, contact frame 19, interlocking link 2
0, a handle 21, and a bistable electromagnet device 22. The trip link 17 is a fixed shaft 23
bimetal 15 and short circuit sensor 1
The movable rod 16a of the plunger 16 of No. 2 is opposed to the movable rod 16a of the plunger 16, and the return spring (a torsion coil spring supported by the fixed shaft 23, one end of which is engaged with the frame F and the other end of which is engaged with the trip link; not shown) in the opposite direction (see FIG. 1). clockwise). The latch link 18 is pivotally supported by a fixed shaft 25, with a hook 26 at the tip facing a locking portion 27 of the trip link 17, and is engaged by a trip opening spring (consisting of a torsion coil spring similar to the return spring). It is biased in the stop direction (counterclockwise in Figure 1). The contact frame 19 is connected to the latch link 18 by a shaft 29 at its lower end, and connected to the movable contact 10 and the interlocking link 20 by a shaft 30 at its upper end, and further has a contact pressure between it and the movable contact 10 at its upper position. A applying spring 31 is interposed. 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 electromagnetic device 22 has a pair of magnets 37, 37' and a coil 38. The magnets 37, 37' hold the plunger 34 in the upper and lower positions, and when the coil 38 is energized, the plunger 34 is moved in the opposite direction. Driven.

The operating circuit for controlling the energization of the coil 38 includes a polarity changeover switch 40, diodes D ₁ and D ₂ , a remote control switch 41, and an AC power source E, as shown in FIG. The polarity changeover switch 40 and the diodes D ₁ and D ₂ are arranged at a position 47 indicated by the imaginary line in FIG. Although not shown, the changeover switch 40 is 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 also be a relay, thyristor, transistor, or the like. In this circuit, when the remote control switch 41 is switched to contact a, a unidirectional half-wave rectified current flows through the diode D ₁ to the coil 38 and drives the plunger 34 in one direction. 48 moves, the polarity changeover switch 40 operates and the contacts switch to the state shown by the broken line in FIG. 3, opening the circuit and stopping the current supply, but the plunger 34 is held by the magnets 37, 37'. When the remote control switch 41 is switched to contact b, 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.

The manual trip lever 52 is provided on the shredder outer shell 1 adjacent to the manual handle 21. That is, the hole 53 is formed in the shredder outer shell 1, and the hole 5
A synthetic resin operation button 5 is attached to the bearing portion 54 formed in 3.
The shaft portion 56 of the operation button 55 is inserted in the axial direction and rotatably attached, and the lower end portion 57 of the operation button 55 faces the upper end portion of the trip link 17. A spring stopper piece 58 extends and has a protrusion 59 at its end. 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. FIG. 1 shows that the protrusion 59 of the stopper piece 58 of the operation button 55 is connected to the protrusion 6.
1 and has been positioned, and is not in a tripping operation. FIG. 4 shows a state in which the operation button 55 is rotated in the direction of arrow P so that the protrusion 59 of the stopper piece 58 has climbed over the protrusion 61. At this time, the trip link 17 is pressed at the lower end of the operation button 55.
The upper end of the is pressed against the return spring to cause a trip operation. Further, since the protrusion 59 is engaged with the side of the protrusion 61, the operation button 55 maintains its position, that is, the trip link 17 is maintained in the trip state. When it is rotated to the opposite side, that is, to the original position described above, the trip is released.

Next, we will summarize the operation of this remote control type circuit breaker. That is, the on state is shown in FIG. 5a. In this case, the latch link 18 is latched to the trip link 17,
The plunger 34 of the electromagnetic arrangement 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 5b. 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. 5a, pulling the interlocking link 20 to the right in FIG. 5a, 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. 5c. 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 5d. 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 around the shaft 29 in a direction in which the contact pressure applying spring 31 is compressed, 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 62 moves and the display link 63 rotates, causing the trip display plate 64 to open on the ON display plate 66 formed on the upper surface of the handle 21 and exposed in the window 65. A trip display is displayed on the top surface.

Furthermore, the operation button 55 of the manual trip lever 52
Even if the switch is operated, 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, remote control switch 4
Even if on/off control is performed by mistake at contact 8,
9 is never turned on, and electromagnetic device 2
2, the manual handle 21 operates and the driver
Since the coil 48 is activated, the coil 38 is not constantly energized by the action of the polarity changeover switch 40.

Note that 67 is an arc extinguishing device for extinguishing an arc generated when a short circuit is opened, and 68 and 69 are yokes of the electromagnet device 22.

Next, the load inspection handle device B will be explained. That is, this load inspection handle device B
consists of a cap 70 and a knob 71, the cap 70 is placed over the upper surface of the cutter main body A, and both tongue pieces 72 are elastically engaged with protrusions 73 provided on the inside of the rising side wall of the main body A, so that the cap 70 can be attached and removed freely. Installed. The cap 70 has openings 74 and 75 corresponding to the manual trip lever 52 and the manual handle 21,
Further, a knob 71 is movably provided between the cap 70 and the upper surface of the main body A. This knob 71 has a handle fitting hole 76, a knob portion 77 protruding from the opening 75, a pressing portion 78 facing the manual trip lever 52, and a click leg 79, which is formed on the cap 70. It is click-engaged with the click protrusion 80.

When performing maintenance and inspection on the load side connected to this circuit or disconnector, move the knob 71 to the position shown by the solid line in FIG. 4. As a result, the manual handle 21 is pushed to the off position, and the above-described operation causes the movable contact 10 to
The opening operates. Further, the manual trip lever 52 is rotated to the trip state position by the pressing portion 78,
The trip link 17 is held in a trip state. As a result, even if a remote signal is input to the electromagnetic device 22, the trip state is maintained, so that it cannot be reset and the movable contactor 10 is not turned on. Therefore, maintenance and inspection of the load can be performed safely.

When maintenance and inspection are completed, the knob 71 is returned to its original position (the state shown in FIG. 1), the manual handle 21 is turned on, and the manual trip lever 52 is restored. In this way, maintenance and inspection can be carried out safely and with good operability.

〔Effect of the invention〕

According to the remote control type circuit breaker of the present invention, the load inspection handle device turns off the manual handle and operates the manual trip lever to the trip position.
By operating the load inspection handle device,
The manual handle opens the main contact, and the circuit and disconnector body is in a trip state, so even if a remote signal is supplied to the electromagnetic device, the main contact will not open or close, making maintenance and inspection of the load safe. can. Furthermore, during maintenance and inspection, by operating the load inspection handle device, the manual handle and manual trip lever can be operated simultaneously, resulting in good operability.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a remote control circuit diagram, Fig. 4 is a sectional view of the handle device for load inspection and the state in which it is operated. The figure is an operation diagram. A... Circuit breaker body, B... Handle device for load inspection, C... Current detection unit, 8... One fixed contact of the main contacts, 9... The other movable contact of the main contacts, 10... ...Movable contactor, 21...Manual handle device, 22...Electromagnetic device, 52...Manual trip lever.

Claims (1)

[Claims] 1. A remote control type circuit breaker consisting of a circuit breaker body and a handle device for load inspection, wherein the circuit breaker body is operated by a current detection unit and a manual trip lever. An electromagnetic device having an operable trip link, having a latch link that is latched to the trip link and released by the operation of the trip link, and for operating and remote controlling a manual handle when the latch link is locked to the trip link. The load inspection handle device has a main contact that opens and closes when the trip link operates and opens when the latch link releases, and the load inspection handle device pushes the manual trip lever only in the direction in which the trip link operates by manual operation. and the manual handle is pushed only in the opening direction, and in the return operation, the manual trip lever is moved away from the manual trip lever and the manual handle while the manual trip lever remains in the operating position and the manual handle remains in the opening position, and The load inspection handle device is a remote control type circuit breaker which is detachably attached to the circuit breaker main body.