KR20070032863A - Self-returnable electronic leakage circuit breaker having integrated double switch - Google Patents

Abstract

A self-return type leakage circuit breaker having an integrated double contact switch structure is provided to prevent casualties and asset damages due to an overcurrent by coping with the situation according to a cause of a short circuit and the overcurrent. A self-return type leakage circuit breaker having an integrated double contact switch structure includes an abnormal current detection unit(310), a leakage break/return control unit(320), a leakage break/return driving unit(330), a contact driving unit(340), and a minute voltage generation unit(350). The abnormal current detection unit(310) detects an abnormal current through a ZCT(Zero Cross Transformer) and determines whether the abnormal current is above a predetermined setting value or not when a signal is applied. The leakage break/return control unit(320) controls the circuit breaker to perform break/return operations by the signal determined by the abnormal current detection unit(310). The leakage break/return driving unit(330) provides a periodic pulse and automatically applies the pulse by comparing and determining breaking of power or abnormality of a load according to the signal applied from the leakage break/return control unit(320). The contact driving unit(340) controls power supply by controlling a second contact point side according to the signal applied by the leakage break/return driving unit(330). The minute voltage generation unit(350) checks the load in the leakage break/return control unit(320) by generating a voltage of 3 to 30 volts to solve a cause of power breaking.

Description

Self-returnable electronic leakage circuit breaker with integrated two-stage contact opening and closing structure {Self-returnable electronic leakage circuit breaker having integrated double switch}

1 is a block diagram showing the configuration of a conventional automatic return-type earth leakage breaker;

Figure 2 is a block diagram showing the configuration of the automatic return-type earth leakage breaker having an integrated two-stage contact opening and closing structure according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: overcurrent cutoff 110: primary side contact

200: surge protector 300: earth leakage breaker

310: abnormal current detection unit 311: video current transformer

320: earth leakage blocking / return control unit 330: earth leakage blocking / return drive unit

340: contact driving unit 341: solenoid

342: secondary side contact 350: microvoltage generator

The present invention relates to an automatic return type earth leakage breaker having an integrated two-stage contact opening and closing structure, and more particularly, an overcurrent breaker when an overcurrent flows in, an earth leakage breaker that operates when a short circuit occurs, so that the distribution line is blocked, The present invention relates to an automatic return type circuit breaker having an integrated two-stage contact opening / closing structure that automatically returns to solve the problem so that the supply of power is made stable.

In general, an earth leakage breaker shuts down the AC input when a leakage current occurs due to lightning, surge, or short circuit.

These circuit breakers are used in series with a power circuit breaker that cuts off the power supply in case of overload, protecting people and property.

That is, if a leakage current occurs on the load side by connecting a power circuit breaker and an earth leakage breaker in series with the power input line, the power circuit breaker cuts off the power, and in the event of an overload, the power circuit breaker cuts off the power to prevent fire and electric shock.

However, a general earth leakage breaker has only a function of blocking a contact when an overcurrent or a short circuit occurs with one contact, and there is a problem in that it must be manually restored in order to continue using the power after the interruption.

Utility model registration No. 312397 received a utility model registration dated May 13, 2003 to solve the above problem is as shown in FIG.

Referring to the configuration of the Utility Model Registration No. 312397 with reference to Figure 1, when an abnormal current occurs due to a ground fault or a short circuit together with the conventional overcurrent blocking device 10 to protect the line from the overcurrent flowing through the distribution line, The image current transformer 20 for detecting the error, and the phase current detection unit for determining whether the abnormal current detected by the image current transformer 20 is greater than or equal to the reference set value, or whether the cause of leakage current interruption is eliminated and the abnormal current is maintained below the reference set value. (23), and the circuit breaker according to the instructions of the interruption / return control unit 24 and the interruption / return control unit 24 to perform the function of operating the relay in the event of a ground fault or short circuit, or the cause is eliminated to return the relay. Or the relay 25 performing the return operation, and if the electric current is cut off of the relay operation, the minute current can be checked whether or not the short-circuit state of the load until the power supply is released. The micro-current generator 26 for supplying the power supply and the auto-reset unit 27 for short-circuit due to abnormal current generation and reset to supply pulses periodically so that the input signal can be compared / determined again after the earth leakage circuit breaker is operated. It is composed.

When the overcurrent occurs, the abnormal current is sensed by the image current transformer 22 to operate the cutoff signal input circuit 22a to cut off the power applied through the relay 25.

When the power is cut off, the micro current is supplied through the micro current generator 26 to continuously detect the short-circuit state, and the abnormal current detector 23 continuously detects the abnormal current through the image current transformer 22. Check the over current condition.

As shown in FIG. 1, the conventional invention cuts the power only for the overcurrent through the overcurrent cutoff device, and the ground fault and the short circuit breaks the power for the ground fault and the short circuit, and automatically returns when the cause of the cutoff is eliminated. In order to solve the problem of ground fault and short circuit, the power is reapplied and thus the power is frequently cut off.

In addition, the circuit configuration to cut off the power supply due to a short circuit is complicated, a lot of manufacturing time according to the complex circuit configuration, there is a problem that the price competitiveness is lowered as a factor of unit price rise.

The self-recovering type earth leakage breaker having an integrated two-stage contact opening and closing structure according to the present invention for solving the above problems is to block only parts for ground fault, short circuit, and overcurrent with the electromagnet on the primary side, and to recover only by manual operation. It solves the fundamental problem caused by the power cut off, and on the secondary side, it is only a part related to the leakage, and the automatic return type earth leakage breaker has an integrated two-stage contact opening / closing structure which makes the power supply stable by automatically blocking and returning. The purpose is to provide.

In addition, the ground fault, short circuit, and over current detected by the primary side can be checked by the user directly or by an expert to identify the cause of the ground fault, short circuit, and over current so that the situation can not occur later. An object of the present invention is to provide an automatic return type circuit breaker having a contact opening and closing structure.

In addition, it is an object of the present invention to provide an automatic return type circuit breaker having an integrated two-stage contact opening and closing structure to prevent a fire caused by an overload, so as to cope with the situation by checking only the overload that the user does not easily recognize.

The self-recovering type earth leakage breaker having an integrated two-stage contact opening and closing structure according to the present invention for achieving the above object is an overcurrent blocking device for shutting off the power when a ground fault, a short circuit, an overcurrent occurs, and a surge caused by lightning. In this case, the surge protector bypasses this to the ground and detects the fault current in the fault current detection unit through the signal applied from the video current transformer to perform the over current break function, the earth leakage break function and the return function. In the self-recovering type earth leakage circuit breaker which performs the reset / recovery and judges the state of the short circuit state through the micro current generator and automatically resets it through the auto reset unit, the abnormal current is sensed through the image current transformer (ZCT) to apply a signal. An abnormal current detection unit to determine whether or not the set value is greater than or equal to the set value; A circuit breaker / return control unit for controlling the circuit breaker to perform a block / return operation based on a signal determined by the fault current detection unit; An earth leakage blocking / recovery driving unit for supplying periodic pulses automatically by comparing and determining whether the power is cut off or whether there is a load abnormality by a signal applied from the earth leakage blocking / return control unit; A contact driver controlling the power supply by controlling the second contact side according to a signal applied from the earth leakage blocking / return driver; An integrated two-stage contact point consisting of a microvoltage generator that generates a voltage within 3 to 30 volts (V) to withstand the cause of power interruption and checks the presence or absence of a load in the ground fault interruption / return control unit. An automatic return type circuit breaker having an opening and closing structure is provided.

Hereinafter, a self-recovering type earth leakage breaker having an integrated two-stage contact opening and closing structure according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a block diagram showing the configuration of an automatic return type circuit breaker having an integrated two-stage contact opening and closing structure according to the present invention, as shown in Figure 2 the present invention is grounded by a primary side contact 110, short circuit And, the overcurrent blocking unit 100 to cut off the power only responsible for the overcurrent portion; A surge protector (200) for protecting the circuit by a power applied through the overcurrent blocking unit (100); When the short circuit occurs in the power applied through the over-current blocking unit 100 is composed of a ground fault blocking unit 300 for automatically blocking / returning the secondary side contact 342.

The earth leakage breaker 300 is an abnormal current detection unit 310 for detecting an abnormal current caused by a ground fault, a short circuit, or a short circuit, and a circuit breaker for automatically controlling a breaker / return operation when a ground fault, a short circuit, or a short circuit occurs. The circuit breaker / recovery driving unit 330 automatically supplies a periodic pulse by determining whether the power is cut off or whether the load is abnormal or not according to the control signal of the / return control unit 320 and the cutoff / return control unit 320. ) And the contact driver 340 for blocking / returning the distribution line by the signal of the earth leakage breaker / return driver, and the micro voltage generator 350 for checking whether the load is abnormal when the contact driver 340 is blocked by the operation of the contact driver 340. It is composed of

The abnormal current detection unit 310 is configured as a video current transformer (ZCT) 311 that detects whether or not the abnormal current is greater than or equal to the reference set value.

The contact driver 340 includes a solenoid 341 for shorting or contacting a contact, and a second side contact 342 for applying and cutting off power by driving the solenoid 341.

When the power supply is cut off, the micro voltage generator 350 generates a voltage within 3 to 30 V to eliminate the cause thereof and checks whether there is a load.

The operation of the automatic return type earth leakage breaker having a two-stage contact opening and closing structure according to the present invention configured as described above will be described.

When the current is applied to the primary side contact 110 by any one of the excessive current, excessive voltage due to ground fault, short circuit, over current, or at the same time to check this to protect the electric device connected to the output side overcurrent blocking unit 100 Power off at).

And when the overcurrent cut-off unit 100 operates by the power applied to the primary side contact 110 to cut off the power supply, the user does not return automatically but keeps the cut-off state by asking the user directly or by an expert for a ground fault or short circuit. In addition, it is possible to determine where the overcurrent occurred.

By identifying the cause of ground fault, short circuit and over current, the user can cope with the cause and prevent human injury and property damage from fire which can be caused by over current.

When a short circuit occurs, if an abnormal current occurs due to a short circuit in the power applied from the input side, the short circuit current sensing unit 310 detects it through the image current transformer 311.

The abnormal current signal detected by the image current transformer 311 is applied to the leakage / blocking return control unit 320.

The earth leakage blocking / return control unit 320 detects whether the signal applied from the image current transformer 311 increases or decreases according to the reference set value, and if the signal is higher than that, the earth leakage blocking / return driver 330 To apply.

The earth leakage blocking / return driver 330 causes the solenoid 341 to be driven by applying a signal to the contact driver 340 to cut off the applied power by dropping the contact that is currently in contact.

The solenoid 341 may short-circuit the contact which is in contact with the signal applied to the contact driver 340 so that the applied power is cut off.

At this time, when the power is cut off by shorting the secondary side contact 342 by the operation of the contact driver 340, the micro voltage generator 350 applies a voltage within 3 to 30 V in order to determine whether the blocked cause has been eliminated. Check the load on the load side.

The necessary power for generating power in the micro voltage generator 350 is connected to receive the necessary power between the secondary side contact 342 and the image current transformer 311.

The periodic pulse signal is generated by the leakage breaking / return driver 330 at the voltage generated by the micro voltage generator 350 and applied to the leakage breaking / return control unit 320, and the signal is analyzed and determined.

When it is determined that no abnormality occurs on the load side by the applied pulse signal, the ground fault interruption / return control unit 320 applies a signal to the ground fault interruption / return driver 330.

The signal applied to the earth leakage blocking / return driver 330 again applies a signal to the solenoid 341 of the contact driver 340 to contact the shorted secondary side contact 342 so that power is applied to the output side.

In addition, the surge protector 200 bypasses the earth leakage breaker 300 and the electric device connected to the output side from the moment or abnormal current generated by a lightning strike or a nearby power device.

When the normal current flows, the current is blocked from passing through the surge protector 200 so that power is applied to the electric device connected to the output side through the earth leakage breaker 300.

The effect of the self-recovering type earth leakage breaker having an integrated two-stage contact opening / closing structure according to the present invention is responsible for ground fault, short circuit, and overcurrent at the overcurrent interruption part, and the ground fault is generated by the power applied in charge of the earth leakage breaker. Detecting and determining the problem precisely and precisely, there is an effect that can provide a stable power supply to the output side.

In addition, if the power is cut off due to ground fault, short circuit, or over current, the user will not be automatically restored. Therefore, the user can cope with the situation according to the cause of ground fault, short circuit, or over current. It can work.

Claims (2)

An over-current cut-off device that cuts off the power when a ground fault, short-circuit or over-current occurs, and a surge protector that bypasses the surge when a surge occurs, such as a lightning strike, and an image to perform the over-current cut-off function, earth leakage cut-off function, and recovery function The abnormal current detection unit detects the abnormal current through a signal applied from the current transformer, and when the abnormal current is detected, the relay is shut off / restored, and it is automatically reset through the auto reset unit by judging whether or not a short circuit is detected through the micro current generator. In the automatic return type earth leakage breaker, An abnormal current detection unit 310 that detects an abnormal current through the image current transformer (ZCT) 311 and determines whether the signal is greater than or equal to a set value; A circuit breaker / return control unit 320 for controlling the circuit breaker to perform a block / return operation based on the signal determined by the abnormal current detection unit 310; An earth leakage blocking / recovery driving unit 330 for supplying periodic pulses automatically by comparing and determining whether the power is cut off or whether or not there is a load abnormality by a signal applied from the earth leakage blocking / return control unit 320; A contact driver 340 for controlling the power supply by controlling the second contact side 342 by a signal applied from the ground fault blocking / return driver 330; In order to solve the cause of the interruption of the power supply to generate a voltage of 3 to 30 volts (V) endurance characterized in that it consists of a micro-voltage generator 350 to check the presence or absence of the load in the earth leakage blocking / return control unit 320 Self-recovering type earth leakage breaker with integral two-stage contact opening and closing structure. The method of claim 1, The contact driver 340 is a solenoid 341 for shorting or contacting the contact, An automatic return type circuit breaker having an integrated two-stage contact opening / closing structure, characterized in that the solenoid (341) is configured as a secondary side contact point (342) for applying and cutting off power.

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