JPS60200414A - Circut for driving 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] The present invention relates to a drive circuit for a remote-controlled circuit breaker.

[Background technology]

A conventional example is shown in FIG. That is, 51 is an electromagnetic coil that controls the circuit breaker body to turn on and off;
52a and 52b are diodes, 53(1) is a changeover switch that is linked to the on/off operation of the circuit breaker main body A, 54 and 55 are remote control switches, and 56 is an AC power source. In operation, when the remote control switch 54 is turned on, the electromagnetic coil 5 is turned on through the diode 52a.
An alternating current half wave flows in one direction through the coil 51, and the plunger moves in one direction due to the excitation of the coil 51, turning on the circuit breaker body A, for example. In conjunction with the ON operation of the circuit breaker main body A, the changeover switch 53 is switched to the position indicated by the broken line. When the remote control switch 54 is pressed &11, the coil 51
Power is cut off. Next, when the remote control switch 55 is turned on, while the switch 55 is pressed, an AC half wave flows in the opposite direction to the above through the diode 52b, the plunger operates in the opposite direction, and the circuit breaker main body A is turned off.

In conjunction with this off operation, the changeover switch 53 is switched to the position indicated by the solid line. The drive circuit of this remote control type circuit breaker performs remote control through such operations.

However, since the current flowing through the coil 51 is an alternating current (2) half wave, if the operating voltage is lowered, the current may become zero before the operation of the electromagnetic plunger is completed. In the case of 60 cycles of AC half wave, 6 to 8 ma
Because the de-energized state continues for a long time, the plunger of the electromagnet operates only part way, and the plunger is pulled back to some extent by the attraction force in the opposite direction. The disadvantage is that the operation takes a long time because the operation is completed in waves. This phenomenon can be expressed graphically as shown in Figure 2. That is, Fig. 2 f
a+ is a waveform diagram of the coil due to AC half-wave, the same figure (bl is the displacement of the plunger, the same figure (c) is the stroke attraction force characteristic, which is as shown in the operating characteristic Q1. Q2 is the non-excited attraction force characteristic .

[Purpose of the invention]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a drive circuit for a remote control type circuit breaker, which uses a low voltage and can shorten the operation time due to AC half-wave.

[Disclosure of the invention]

(3) In this invention, a capacitor is connected in parallel to the coil of an electromagnet, and an alternating current half wave is supplied from a remote control unit. In AC half-wave energization in either direction, the coil is excited and the capacitor is charged in one half cycle, and the charge in the capacitor is discharged to the coil in the remaining half cycle to excite the coil. Therefore, since the plunger continues to operate without being pulled back, the operation of the plunger becomes faster.

An embodiment of this invention is shown in FIGS. 3 to 6. Third
The figure shows the circuit breaker body A', where 1 is the device stand, 2 is the cover, 3 is the bistable polar electromagnet, 4 is the mechanism, 5 is the movable contact, 6 is the trip mechanism, and 7 is the short circuit detection device. , 8 is an overcurrent detection bimetal, 9 is a terminal device on the power supply side, and 10 is a terminal device on the load side. Katori 1st line 1
1. Fixed contact 12. Fixed contact 13. Movable contact 14. Movable contact 5. Katori 1st line 15. Frame 16° bimetal 8. Flexible lead wire 17. Coil 18 of short circuit detection device 7. It flows through the terminal device 10. (4) The ON operation is performed via the link 20 by tilting the handle 19 to the right (the state shown in FIG. 3) manually or by using the electromagnet 3 (plunger 3a moves downward) while the lip mechanism 6 is in the latched state. The upper end of the movable contact 5 is pushed, the movable contact 5 rotates about the shaft 21, and the movable contact 14 comes into contact with the fixed contact 13.

The off state is performed by the opposite operation (in the case of the electromagnet 3, the current direction is reversed). In any of these on/off cases,
It is held by the holding force of the permanent magnet 3a of the electromagnet 3.
In addition, when an overcurrent flows in the on state, the bimetal 8 bends, and when a short circuit current flows, the plunger 22 of the short circuit detection device 7 operates, and in either case, the trip link 23 of the trip mechanism 6 is pushed and rotated clockwise around the shaft 24. Due to the operation of the trip link 23, the latch link 25 is unlatched, and the shaft 21 is moved to the shaft 26.
By rotating around , the movable contact 5 performs an opening operation while the handle 19 is held by the electromagnet 3. To reset after recovering from an accident, turn off the handle 19 (manually or with the electromagnet 3) (5) and pull the movable contact 5 through the link 20, causing the latch link 25 to rotate counterclockwise. is latched to the trip link 23 in the return state.
In addition, 27 is a remote control terminal connected to the remote control switch 29, 28 is an alarm or auxiliary terminal, 29 is a trip test button, 30 is a trip display device, 31 is an arc extinguishing device, and 32 is a short circuit detection device 7. Trip link 2 due to operation
3 is a contact pressure spring, 34 is a buffer spring, and 35 is a fourth
As shown in the figure, a changeover switch (FIG. 4) operated by a protrusion 19a in conjunction with the ON and OFF operations of the handle 19, 36.degree. 37 is a diode.

Now, the drive circuit B for remotely controlling the electromagnet 3 is different from that in FIG. 1 except that a capacitor 39 is provided in parallel with the coil 38 of the electromagnet 3 as shown in FIG. 5, and the other configurations are the same. In this case, when a half-wave current flows through the coil 38, the coil 38 is excited by the half-wave, and the capacitor 3
9 is charged with electric charge (6). Therefore, in the remaining half cycles, the charge in the capacitor 39 is discharged to the coil 38, and the excitation is maintained, and the plunger 31) is moved by the magnetic force in these one cycle. Therefore, the current flowing through the coil 38 becomes as shown in FIG. 6 in one AC cycle, and the displacement and attraction force characteristics of the plunger Q',
iJ same figure (bl, (Shows a stable change like C1.) In this way, the electromagnet 3 continues until the operation of the electromagnet 3 is completed.
By placing the plunger 3b in an excited state, the minimum operating voltage can be lowered and the operating time of the plunger 3b can be shortened.

In the present invention, the control method for feeding power to the coil 38 is not limited to the above-mentioned embodiment as long as it is an AC half-wave method.

〔Effect of the invention〕

As described above, the present invention has the advantage that the remote control can be reduced and the operating time can be shortened.

(7)

[Brief explanation of the drawing]

1st ret;I drive circuit diagram of conventional example, Fig. 2 shows current waveform,
An explanatory diagram showing the plunger displacement and attraction force characteristics, FIG. 3 is a sectional view of the circuit breaker body according to an embodiment of the present invention, FIG. 4 is a schematic side view of the changeover switch, FIG. 5 is a drive circuit diagram, and FIG. Figure 6 shows the coil current waveform. FIG. 3 is an explanatory diagram showing plunger displacement and attraction force characteristics. A'...Circuit breaker body, B...Drive circuit (remote control unit), 3...Electromagnet, 38...Coil, 39...
...Capacitor (8) ″′−″″″(

Claims (1)

[Claims] an electromagnet that controls the breaker body to turn on or off depending on the direction of energization; a remote control unit that supplies an AC half wave in a predetermined direction to the coil of the electromagnet; A drive circuit for a remote control I-roll type circuit breaker, comprising a capacitor that is charged and energizes the coil by tightening the coil during the remaining half-cycle period.