KR101668025B1 - Circuit breaker - Google Patents

Abstract

An earth leakage breaker is started. The embodiments of the present invention prevent the power source side and the load side of the earth leakage breaker from being changed due to the operator's mistake. In other words, the embodiments of the present invention prevent the reverse connection of the earth leakage breaker from the beginning, thereby enhancing the stability of the earth leakage breaker. Embodiments of the present invention include a function of giving an alarm to an operator at the time of reverse connection of the earth leakage breaker, thereby preventing the earth leakage breaker from being connected backward and providing a reverse connection using light or sound, do. The embodiments of the present invention include a circuit for providing an alarm to an operator at the time of wrong connection of the earth leakage breaker and disabling the input of the handle when the worker inserts the handle of the earth leakage breaker, Prevents burnout of parts.

Description

{CIRCUIT BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage breaker having a function for preventing mis-connection of an earth leakage breaker.

Generally, the earth leakage breaker is a unit in which an opening / closing mechanism, a trip device and the like are integrally assembled in an insulating container. The earth leakage circuit breaker is a device that can open or close a transformer in an energized state manually or electrically, and automatically shut off the current when an overload, a disconnect, or a short circuit occurs. These leakage circuit breakers play an important role in protecting the equipment and the life of the load by detecting abnormal currents in the case of leakage current, ground fault, human electric shock accident, and short circuit current.

1 is a perspective view of a general earth leakage breaker. 1, the earth leakage breaker includes a cover 1 and a case 2 forming an outer shape, a handle 3 provided on the upper surface of the cover 1 for opening and closing a circuit, A display window 4, a leak test button 5 for a preliminary check, and a trip test button 6.

Fig. 2 is a sectional view II-II of Fig. 1. Fig. 2, the cover 1 and the case 2 of the earth leakage breaker are provided with an electrical leak detecting portion 7 for detecting a leakage current generated in the load, An overcurrent / short circuit detecting portion 10 for detecting an overcurrent or a shortcircuit current in addition to the leakage current; and an overcurrent / short circuit detecting portion 10 for detecting an overcurrent or a shortcircuit current in addition to the leakage current, An SOHO device 11 for quickly extinguishing an arc generated between the contacts, and other power supply side terminal block 12 and load side terminal block 13 are provided.

The earth leakage breaker converts the current difference to a voltage through a primary conductor through which the main circuit current flows and a Zero-phase Current Transformer (ZCT) with a secondary winding wound around the core. An electromotive force is generated in the secondary winding by the magnetic flux corresponding to the magnetic flux difference of each phase by synthesizing the vector of the iron core generated by each phase current of the primary conductor. Therefore, no electromotive force is generated when the vector sum of each phase current is 0 regardless of the magnitude of the primary current. If a short circuit or a ground fault occurs, the current balance of each phase is destroyed, and the iron core is excited by the magnetic flux corresponding to the magnitude of the leakage current or ground fault current to generate electromotive force in the secondary winding.

The signal generated by the video current transformer is applied to the element for detecting electric leakage (IC). The IC for short circuit detection receives the signal generated by the current transformer, amplifies the signal, and determines the size of the signal. The leakage detection IC generates an output that turns on the thyristor (SCR) when its size exceeds a certain standard. When the thyristor is turned on, current flows to the trip coil of the earth leakage breaker and the mechanical mechanism trips.

On the other hand, when the operator installs the earth leakage breaker on the line, the situation that the power line side and the load side are reversed frequently occurs. In this case, when a short circuit occurs or a test button is pressed, the earth leakage breaker once opens the line by the internal circuit, but the electromagnet coil in the interior is burned and the function of the earth leakage breaker is no longer lost. As described above, almost all of the earth leakage breakers use an IC for short circuit detection, a video current transformer, and an electromagnet coil. When a short circuit is detected, the thyristor connected in series to the electromagnet coil is turned on When the thyristor is turned on, a current flows through the electromagnet coil, and the electromagnet coil operates to open the earth leakage breaker. However, when the thyristor is turned on, The on-state is maintained. In addition, since the earth leakage breaker uses a contact point in the open / close part in the opening and closing operation, the contact point is usually placed on the power source side of the breaker. Therefore, even if consideration is given to the directionality of the arc, It is important not to change the direction.

An object of the present invention is to prevent a power source side and a load side of an earth leakage breaker from being changed due to an operator's mistake.

It is an object of the embodiments of the present invention to provide an earth leakage breaker having a function of giving an alarm to an operator at the time of reverse connection of the earth leakage breaker.

The embodiments of the present invention provide an electric leakage circuit breaker having a circuit for giving an alarm to an operator at the time of wrong connection of the electric leakage breaker and for disabling the insertion of the handle when the worker inserts the handle of the electric leakage breaker There is another purpose in.

The earth leakage breaker according to one embodiment includes an open / close mechanism for opening and closing a line, and a trip coil for generating a trip signal to the open / close mechanism. The leakage circuit breaker detects a short circuit of the line, And a connection display unit connected to the opening / closing mechanism and indicating that the line is misconnected. Here, the connection indication unit may include a display switch operatively connected to the opening / closing mechanism unit, and an optical output unit connected in series to the display switch and outputting light when the display switch is turned on . The connection display unit may further comprise a sound output unit connected to the display switch and outputting sound when the display switch is turned on.

According to another aspect of the present invention, there is provided an earth leakage breaker comprising: an open / close mechanism for opening and closing a line; and a trip coil for generating a trip signal to the open / close mechanism, A connecting display unit connected to the opening / closing mechanism unit and indicating when the line is erroneously connected, and a connection protection unit provided between the opening / closing mechanism unit and the trip coil, Unit.
The connection protection unit includes an input switch operatively connected to the opening / closing mechanism unit, an energy storage unit connected in series to the input switch and storing energy when the input switch is turned on, and an energy storage unit electrically connected to the opening / And an output switch for controlling the energy stored in the energy storage unit to be output to the trip coil, so as to be turned on or off so as to be opposite to the state of the input switch.

The embodiments of the present invention prevent the power source side and the load side of the earth leakage breaker from being changed due to the operator's mistake. In other words, the embodiments of the present invention prevent the reverse connection of the earth leakage breaker from the beginning, thereby enhancing the stability of the earth leakage breaker.

Embodiments of the present invention include a function of giving an alarm to an operator at the time of reverse connection of the earth leakage breaker, thereby preventing the earth leakage breaker from being connected backward and providing a reverse connection using light or sound, do.

The embodiments of the present invention include a circuit for providing an alarm to an operator at the time of wrong connection of the earth leakage breaker and disabling the input of the handle when the worker inserts the handle of the earth leakage breaker, Prevents burnout of parts.

1 is a perspective view schematically showing a general earth leakage breaker;
FIG. 2 is a detailed view of a cross section taken along line II-II of FIG. 1;
3 is a block diagram schematically illustrating a configuration of an earth leakage breaker according to an embodiment;
FIG. 4 is a view showing the main body of the earth leakage breaker in FIG. 3;
5 is a circuit diagram showing the configuration of the earth leakage breaker of FIG. 3;
6 is a view for explaining a normally-connected circuit breaker;
FIGS. 7 and 8 are diagrams for explaining an earth leakage breaker that is erroneously connected to the load side;
9 and 10 are flowcharts schematically illustrating a connection protection method of an earth leakage breaker according to embodiments of the present invention; And
11 is a detailed flowchart of the protection method of the earth leakage breaker of FIG.

3, the earth leakage breaker according to one embodiment includes an earth leakage breaker main body 100 for detecting a short circuit of a line to cut off the line when a short circuit occurs, and a connection indicator unit (200). Here, the pulse breaker includes an open / close mechanism 110 for opening and closing the line, and a trip coil 120 for generating a trip signal to the open / close mechanism 110. The connection indicator unit 200 is connected to the opening / closing mechanism unit 110.

4, the earth leakage breaker main body includes an opening / closing mechanism 110, a trip coil 120, a rectifying part 130, a smoothing part 140, a control part 150, a trip coil driving part 160 And a video current transformer 170. The video current transformer 170 is connected to the video transformer 170,

The opening and closing mechanism unit 110 opens and closes the line according to the trip signal. The trip coil 120 generates the trip signal by the charged current so that the opening / closing mechanism 110 operates. The rectifying unit 130 rectifies the AC power inputted from the power source to the DC power source. In general, the rectifying unit 130 is composed of a bridge circuit. The smoothing unit 140 smoothes the DC power rectified by the rectifying unit 130 and supplies the DC power to the control unit. The control unit 150 receives a leakage detection signal from the image transformer 170, compares a preset reference value with a detection signal value to determine a leakage current, and generates a trigger signal to the trip coil driving unit 160. The trip coil driving unit 160 supplies a current to the trip coil 120 based on a trigger signal of the controller 150. [ As the trip coil driver 160, a silicon rectifier (SCR) is generally used. A Zero Current Transformer (ZCT) 170 senses a short circuit by using a current difference between two lines, generates a short circuit signal, and outputs the short circuit signal to the controller 150.

The main body of the earth leakage breaker further includes a load resistance 180 for forming a proportional voltage on the secondary side of the video current transformer 170 and a leakage test portion 190 for testing the leakage of the line.

5, the connection indicator unit 200 includes a display switch 210 that is mechanically connected to the opening / closing mechanism unit, a display switch 210 that is connected in series to the display switch 210, And a light output unit 220 for outputting light when turned on. The display switch 210 is turned off when the opening / closing mechanism unit 110 is turned on. Conversely, when the opening / closing mechanism unit 110 is turned off, the display switch 210 is turned on. That is, the display switch 210 is preferably a B-contact type switch. A light emitting diode (LED) may be used as the light output unit 220.

The connection display unit 200 further includes a sound output unit 230 connected to the display switch 210 and outputting sound when the display switch 210 is turned on. As the sound output unit 230, a beeper, a buzzer, or the like may be used. In FIG. 5, reference numeral 240 denotes a resistor for adjusting the current and voltage flowing in the sound output unit 230.

Fig. 6 shows a form in which the earth leakage breaker is normally connected to the power line. 6, when the opening / closing mechanism unit 110 is changed from the turn-off state to the turn-on state, that is, when the line is connected, the display switch 210 is turned off, And the sound output unit 230 does not operate.

Fig. 7 shows a form in which the earth leakage breaker is connected to the load side line. Referring to FIG. 7, since the opening / closing mechanism unit 110 is turned off, the display switch 210 is turned on. Accordingly, the light output unit 220 emits light, and at the same time, the sound output unit 230 also sounds an alarm sound. The user sees the light output from the light output unit 220 or hears the alarm sound output by the sound output unit 230 and finds that the earth leakage breaker is in an incorrect connection.

3 and 5, the earth leakage breaker according to another embodiment includes an open / close mechanism 110 for opening and closing a line, and a trip coil 120 for generating a trip signal in the open / close mechanism 110 An earth leakage breaker main body 100 for detecting a short circuit of the line and shutting off the line when a short circuit occurs, a connection indicator unit 200 connected to the opening / closing mechanism unit 110, And a connection protection unit 300 provided between the opening and closing mechanism 110 and the trip coil 120 and operating the opening and closing mechanism 110 when the line is erroneously connected.

5, the connection protection unit 300 includes an input switch 310 that is mechanically connected to the opening / closing mechanism unit 110, an input switch 310 connected in series to the input switch 310, An energy storage unit 320 that stores energy when the power source 310 is turned on and an output switch that is operatively connected to the opening and closing mechanism unit 310 to output the energy to the trip coil 120 330). The connection protection unit 300 further comprises a diode 340 for half-wave rectifying the input current and forming a current path.

The input switch 310 may be a B-contact type switch that is turned on when the opening / closing mechanism unit 110 is turned on and is turned on when the opening / closing mechanism unit 110 is turned off . The output switch 330 may be an A-contact type switch that is turned on when the opening / closing mechanism unit 110 is turned on and is turned off when the opening / closing mechanism unit 110 is turned off .

Fig. 7 shows a form in which the earth leakage breaker is connected to the load side line. Referring to FIG. 7, since the opening / closing mechanism unit 110 is turned off, the display switch 210 is turned on. Accordingly, the light output unit 220 emits light, and at the same time, the sound output unit 230 also sounds an alarm sound. The user sees the light output from the light output unit 220 or hears the alarm sound output by the sound output unit 230 and finds that the earth leakage breaker is in an incorrect connection. Also, since the opening / closing mechanism unit 110 is turned off, the input switch 310 is turned on, and the energy storage unit 320 is charged with energy through the diode 340. When the energy storage unit 320 completely fills up the energy, the current no longer flows.

8 is a diagram for explaining a circuit operation when the user or the like forcibly inputs the earth leakage breaker despite the alarm through the light output unit or the sound output unit in the state of FIG.

8, when the open / close mechanism 110 of the earth leakage breaker is operated in the state that the line is connected to the load side, that is, when the turn-off state is changed from the turn-off state to the turn- The light output unit 220 stops emitting light, and the sound output unit 230 stops outputting the alarm sound. At the same time, the input switch 310 is turned off and the output switch 330 is turned on. The energy stored in the energy storage unit 320 is discharged to the trip coil 120 through the output switch 330. Thus, the trip coil 120 operates to generate a trip signal and operates the opening / closing mechanism 110 to quickly turn off the opening / closing mechanism 110. Thus, the circuit of Fig. 8 returns to the circuit state of Fig. That is, when the open / close mechanism 110 of the earth leakage breaker is forcibly turned on in the erroneous connection state, that is, in the state where the line is connected to the load side, the circuit states of FIGS. 7 and 8 are repeated.

Referring to FIG. 9, a connection protection method for an earth leakage breaker according to an embodiment includes an open / close mechanism for opening and closing a line, and a trip coil for generating a trip signal to the open / close mechanism, (S110) of judging whether or not the line is misconnected, the method comprising the steps of: (S110) judging whether or not the line is misconnected; and when the line is connected to the load side, (S120) of turning on the line, and a step (S130) of displaying a determination result, and the displaying step outputs light or sound of the connection of the line. The connection protection method further includes a step (S140) in which the display switch is turned off when the line is connected to the load side. The configuration of the apparatus will be described with reference to Figs.

Fig. 6 shows a form in which the earth leakage breaker is normally connected to the power line. 6, when the switching mechanism is changed from the turn-off state to the turn-on state, that is, when the line is connected (S10), the display switch is turned off so that the light output section does not emit light, The bankruptcy operation is not performed.

Fig. 7 shows a form in which the earth leakage breaker is connected to the load side line. Referring to FIG. 7, since the opening / closing mechanism is turned off (S110), the display switch is turned on (S120). As a result, the light output unit emits light (S131), and the sound output unit also sounds an alarm sound (S132). The user sees the light output from the light output section or hears the alarm sound output by the sound output section and finds that the earth leakage breaker is in an incorrect connection.

10, a connection protection method for an earth leakage breaker according to another embodiment includes an open / close mechanism for opening and closing a line, and a trip coil for generating a trip signal to the open / close mechanism, (S210) of judging whether or not the line is erroneously connected, and a step of connecting the display switch connected to the opening / closing mechanism unit (S230) of displaying the result of the determination as light or sound (S230), storing the energy when the line is connected to the load side (S250), and a step (S260) of receiving an operation command, and outputting the stored energy to the trip coil upon receipt of the operation command (S270). The connection protection method further includes a step (S240) in which the display switch is turned off when the line is connected to the load side. The configuration of the apparatus will be described with reference to Figs.

Referring to FIG. 11, the energy storage step S250 includes a step S251 in which the input switch connected to the opening / closing mechanism is turned on and a step S252 in which the output switch connected to the opening / closing mechanism is turned off And an energy storing capacitor connected to the input switch stores the energy (S253).

Fig. 7 shows a form in which the earth leakage breaker is connected to the load side line. Referring to Fig. 7, since the opening / closing mechanism is turned off (S210), the display switch is turned on (S220). As a result, the light output unit emits light, and at the same time, the sound output unit also sounds an alarm sound (S230). The user sees the light output from the light output section or hears the alarm sound output by the sound output section and finds that the earth leakage breaker is in an incorrect connection. Since the switch mechanism is turned off, the input switch is turned on (S251), the output switch is turned off (S252), and the capacitor of the energy storage unit is charged with energy (S253). When the energy store is fully charged, the current no longer flows.

11, the step S270 of outputting the energy may include a step S271 of turning on / off the switching mechanism according to the operation command, and a step S271 of turning on / (S272) in which the switch is turned off, and a step (S273) in which the output switch is turned on in accordance with the turn-off operation of the opening / closing mechanism.

8 is a diagram for explaining a circuit operation when the user or the like forcibly inputs the earth leakage breaker despite the alarm through the light output unit or the sound output unit in the state of FIG. Referring to FIG. 8, when the switching mechanism of the earth leakage breaker is operated (S260) while the line is connected to the load side, that is, when the turn-on state is changed from the turn-off state to the turn-on state (S271) The light output section stops the light emission, and the sound output section stops the output of the alarm sound. At the same time, the input switch is turned off (S272), and the output switch is turned on (S273). The energy stored in the energy storage unit is discharged to the trip coil through the output switch. As a result, the trip coil operates to generate a trip signal, and the opening / closing mechanism is operated to quickly turn off the opening / closing mechanism (S280). Thus, the circuit of Fig. 8 returns to the circuit state of Fig. That is, when the open / close mechanism of the earth leakage breaker is forcibly turned on in the erroneous connection state, that is, in the state where the line is connected to the load side, the circuit states of FIGS. 7 and 8 are repeated.

INDUSTRIAL APPLICABILITY As described above, in the earth leakage breaker and the connection protection method according to the present invention, the power source side and the load side of the earth leakage breaker are not changed by the operator's mistake. In other words, the embodiments of the present invention prevent the reverse connection of the earth leakage breaker from the beginning, thereby enhancing the stability of the earth leakage breaker. Embodiments of the present invention include a function of giving an alarm to an operator at the time of reverse connection of the earth leakage breaker, thereby preventing the earth leakage breaker from being connected backward and providing a reverse connection using light or sound, do. The embodiments of the present invention include a circuit for providing an alarm to an operator at the time of wrong connection of the earth leakage breaker and disabling the input of the handle when the worker inserts the handle of the earth leakage breaker, Prevents burnout of parts.

100: Earth leakage breaker main body 200: Connection indication unit
300: connection protection unit 110: opening /
120: trip coil 130: rectifying part
140: smoothing unit 150:
160: Trip coil driver 170: Video current transformer
180: Burden resistance 190: Leakage test part
210: display switch 220: light output section
230: sound output unit 310: input switch
320: Energy storage unit 330: Output switch

Claims (6)

An earth leakage breaker main body having an opening and closing mechanism for opening and closing a line and a trip coil for generating a trip signal in the opening and closing mechanism portion and for detecting a short circuit of the line to cut off the line when a short circuit occurs;
And a light output section connected in series to the display switch and outputting light when the display switch is turned on, wherein the light output section is connected to the opening / A connection indication unit for indicating when the line is erroneously connected; And
An input switch which is provided between the opening and closing mechanism and the trip coil and operates when the line is erroneously connected to the opening and closing mechanism unit and is mechanically connected to the opening and closing mechanism unit; The energy storage unit is operatively connected to the opening / closing mechanism unit, and is turned on or off so as to be opposite to the state of the input switch, so that the energy stored in the energy storage unit And an output switch for controlling the output of the trip coil to the trip coil.
And an earth leakage circuit breaker. The display device according to claim 1,
And a sound output unit connected to the display switch and outputting a sound when the display switch is turned on. The display device according to claim 2,
Wherein the switch is a B-contact type switch that is turned off when the opening / closing mechanism portion is turned on and turned on when the opening / closing mechanism portion is turned off. delete delete The method according to claim 1,
Wherein the input switch is a B-contact type switch that is turned off when the opening / closing mechanism portion is turned on and turned on when the opening / closing mechanism portion is turned off,
Wherein the output switch is an A-contact type switch that is turned on when the opening / closing mechanism portion is turned on and is turned off when the opening / closing mechanism portion is turned off.

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