KR200430938Y1 - Auxiliary switch of electronic overcurrent release - Google Patents

Abstract

The present invention relates to an auxiliary switch of a circuit breaker, and more particularly, to an auxiliary switch of a circuit breaker so that the ON / OFF state of the circuit breaker can be easily understood by adding a circuit without installing a separate mechanism. To this end, the current transformer (CT) signal input unit for inputting a current flowing in the converter through the current transformer (CT) as a signal; A microprocessor that blocks the auxiliary switch signal by inputting a current signal from the current transformer signal input unit to output an auxiliary switch signal, and outputting a trip signal when an overcurrent occurs in the converter to block current flow; An auxiliary switch lead wire having one end connected to an output terminal other than the output signal of the trip signal among the output terminals of the microprocessor to transmit an auxiliary switch signal output from the microprocessor; A display device connected to the other end of the auxiliary switch lead wire to display whether the auxiliary switch signal is output; An auxiliary switch of a circuit breaker is provided.

Circuit breaker, auxiliary switch

Description

Auxiliary switch of wiring breaker {AUXILIARY SWITCH OF ELECTRONIC OVERCURRENT RELEASE}

1 is an external perspective view of a conventional circuit breaker;

2 and 3 are longitudinal cross-sectional view showing the operation of the auxiliary switch of the conventional circuit breaker;

4 is a longitudinal cross-sectional view showing the structure of a circuit breaker according to the present invention;

5 is a circuit diagram of an auxiliary switch of a circuit breaker according to the present invention;

** description of the main symbols in the drawings **

10: main body cover 30: CT output unit

40: CT signal input unit 50: microprocessor

60 lamp

The present invention relates to an auxiliary switch of a circuit breaker, and more particularly, to an auxiliary switch of a circuit breaker so that the ON / OFF state of the circuit breaker can be easily understood by only adding a circuit.

In general, wiring breakers are mainly installed in switchboards in factories, buildings, etc., and act as a switchgear that supplies or cuts power to the load side under no load condition. When a large current exceeding the load current flows in order to protect the wires of the converter and the load-side equipment, it serves as a circuit breaker that supplies or cuts off the power supplied from the power supply side to the load side.

Such wiring breakers are manufactured in various structures due to different frame sizes, number of poles, operation methods, and the like, but the mold case, the contactor, the trip device, the opening and closing mechanism, the arc extinguishing device, the terminal, etc. are used as basic elements.

On the other hand, the circuit breaker is provided with an auxiliary switch for displaying the ON / OFF state of the circuit breaker and the remote control device, etc. to increase the convenience of use.

1 is an external perspective view of a conventional circuit breaker, and FIGS. 2 and 3 are longitudinal cross-sectional views illustrating an operation of an auxiliary switch of a conventional circuit breaker.

In a conventional circuit breaker, an auxiliary switch is installed in the installation groove 11 of the circuit breaker main cover 10 shown in FIG. As shown in FIGS. 2 and 3, the auxiliary switch includes a micro switch 13 having an NO (normally open), an NC (normally closed) and a C (common) contact point, an open / closed state display lever 15, and the open / closed state. Springs that provide a restoring force with respect to the status display lever, and a lead wire 12 for transmitting the contact position of the micro switch 13 to the outside.

The operation of the auxiliary switch of the conventional circuit breaker will be described below with reference to the accompanying drawings.

On the second fixed shaft 17 which is the rotation axis of the open / close state display lever 15 of the breaker, one end thereof is fixed to one side of the open / close state display lever, and the other end of the torsion spring is caught on the first fixed shaft 16. A torsion moment is applied to the torsion spring 18 when the lever 15 is rotated counterclockwise around the second fixed shaft 17 by being hit by the movable shaft 19. do.

That is, when the breaker is turned off, the opening / closing mechanism is operated so that the lever striking portion 20 of the mover shaft 19 strikes the tip of the breaker opening / closing state display lever 15 to rotate counterclockwise in the drawing. 15 is rotated counterclockwise in the drawing about the second fixed shaft 17 while giving the torsion spring 18 a torsion moment.

In this way, the pressing force applied to the button 14 of the micro switch 13 is released by the rotation of the breaker open / close state display lever 15, so that the contact point of the micro switch 13 is changed to turn ON / OFF of the breaker. The OFF status is displayed on the control panel (not shown).

However, the auxiliary switch of the conventional circuit breaker is an accessory that displays the state of the breaker when the breaker is ON / OFF, and there is a inconvenience that the user must attach to the breaker and connect a separate power source.

In addition, since the ON / OFF state of the circuit breaker is displayed by the mechanical operation inside the circuit breaker, when the mechanical problem occurs, there is a problem that the function as an auxiliary switch is lost.

The present invention is to solve the above problems, by applying the current transformer (CT) and the electronic circuit of the conventional circuit breaker to add the function of the auxiliary switch, the circuit breaker ON / without the need to install a separate mechanism to the circuit breaker It is an object of the present invention to provide an auxiliary switch of a circuit breaker which can easily recognize an OFF state and can ensure higher reliability than a conventional mechanical operation method.

In order to achieve the above object, the current transformer (CT) signal input unit for inputting a current flowing in the converter through the current transformer (CT) as a signal; A microprocessor which cuts the auxiliary switch signal by inputting a current signal from the current transformer (CT) signal input unit to output an auxiliary switch signal, and outputting a trip signal when an overcurrent occurs in the converter to block current flow; An auxiliary switch lead wire having one end connected to an output terminal other than the output signal of the trip signal among the output terminals of the microprocessor to transmit an auxiliary switch signal output from the microprocessor; A display device connected to the other end of the auxiliary switch lead wire to display whether the auxiliary switch signal is output; An auxiliary switch of a circuit breaker is provided.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 4 is a longitudinal cross-sectional view showing the structure of a circuit breaker according to the present invention, Figure 5 is a circuit configuration of the auxiliary switch of the circuit breaker according to the present invention.

The present invention, the current transformer signal input unit 40 for inputting a current flowing in the converter through the current transformer 30 as a signal; A microprocessor for cutting the auxiliary switch signal by inputting a current signal from the current transformer signal input unit 40 to output an auxiliary switch signal, and outputting a trip signal when an overcurrent occurs in the converter to block the flow of current; 50); An auxiliary switch lead wire 55 having one end connected to an output terminal other than the output signal of the trip signal among the output terminals of the microprocessor 50 and transmitting an auxiliary switch signal output from the microprocessor 50; And a display device 60 connected to the other end of the auxiliary switch lead wire 55 to display whether the auxiliary switch signal is output.

The microprocessor 50 compares an output of a signal input through the current transformer 30 and the current transformer signal input unit 40 with a preset reference value, and trips a trip signal when an abnormal current occurs. ) To turn off the converter. The microprocessor is provided with a plurality of output stages, and some of the output stages are configured to output the trip signal. Accordingly, the auxiliary switch signal according to the present invention is any output stage other than the output stage of the trip signal among the plurality of output stages. It should be configured to output from.

On the other hand, the display device 60 may be any device capable of recognizing whether the breaker is ON / OFF through the human sense, but the light bulb is lit when considering the convenience of production or the user's convenience It is desirable to construct a lamp that can be visually recognized.

The present invention configured as described above has the following actions and effects.

First, when the circuit breaker is in an ON state, current is always induced in the current transformer 30, and the current transformer signal input unit 40 is detected in each phase (R phase, S phase, T phase) of the current transformer. The current is converted into a digital signal and provided to the microprocessor 50. At this time, the microprocessor 40 outputs an auxiliary switch signal, which is transmitted on a lead wire connected to an output terminal other than the trip signal output terminal among a plurality of output terminals of the microprocessor to light up the lamp. . Through this process, the user can know that the state of the breaker is ON.

On the other hand, when the circuit breaker is in the OFF state, no current is induced in the current transformer 30. At this time, since the microprocessor does not output the auxiliary switch signal, the lamp does not turn on. In this way, the user can know that the state of the breaker is OFF.

In addition, the microprocessor 50 compares a signal input through the current transformer 30 and the current transformer signal input unit 40 with a preset reference value, that is, when the input value exceeds the reference value, that is, overcurrent If a lamp is generated, a trip signal is output. It is transmitted to the trip unit (not shown) through the trip signal output terminal to operate the trip unit, and thus the converter is cut off. In this case, the auxiliary switch operates as if the breaker is in the OFF state. The light goes out.

As described above, the auxiliary switch of the circuit breaker according to the present invention can easily recognize the ON / OFF state of the circuit breaker by connecting only the display device to the line drawn out from the microprocessor without attaching a separate mechanism. The reliability of the circuit breaker is improved rather than by the method.

As described above, the auxiliary switch of the circuit breaker according to the present invention can easily recognize the ON / OFF state of the circuit breaker by connecting only a display device such as a lamp to the line drawn from the microprocessor without attaching a separate mechanism. It is easy to manufacture and use, and has the effect of improving the reliability of the circuit breaker than the conventional mechanical operation.

Claims (2)

A current transformer (CT) signal input unit for inputting a current flowing in the converter through the current transformer (CT) as a signal; A microprocessor that blocks the auxiliary switch signal by inputting a current signal from the current transformer signal input unit to output an auxiliary switch signal, and outputting a trip signal when an overcurrent occurs in the converter to block current flow; An auxiliary switch lead wire having one end connected to an output terminal other than the output signal of the trip signal among the output terminals of the microprocessor to transmit an auxiliary switch signal output from the microprocessor; A display device connected to the other end of the auxiliary switch lead wire to display whether the auxiliary switch signal is output; Auxiliary switch of the circuit breaker, characterized in that consisting of. The method of claim 1, And the display device is a lamp.

Images