KR20070011027A - Auto reset earth leakage breaker system - Google Patents

Abstract

An auto reset earth leakage circuit breaker system is provided to automatically control the circuit breaker due to conditions by checking a motivation of breaking. An earth leakage circuit breaker(200) detects and protects an over-current by using a bimetal(212) and a leakage current by using a current transformer(214). A circuit breaker recovery unit receives a signal from the earth leakage circuit breaker, and checks a motivation of breaking, and controls recovery of the earth leakage circuit breaker. The circuit breaker recovery unit includes a monitoring unit(320), a controller(330), and a lever driving unit(340). The monitoring unit includes a primary power detection part, a secondary power detection part, an over-current detection part, and a leakage current detection part. The controller generates a control signal to recover the earth leakage circuit breaker. The lever driving unit drives a lever to recover the earth leakage circuit breaker.

Description

Earth leakage breaker automatic recovery system {AUTO RESET EARTH LEAKAGE BREAKER SYSTEM}

1 is an external view of an earth leakage breaker automatic recovery system according to an embodiment of the present invention.

Figure 2 is an exploded perspective view of the breaker lever driving unit according to an embodiment of the present invention.

Figure 3 is a circuit diagram of a circuit breaker automatic recovery system according to an embodiment of the present invention.

4 is a configuration diagram of an overcurrent input signal conversion unit according to an embodiment of the present invention.

5 is a flowchart illustrating an operation process of an earth leakage breaker automatic recovery system according to an exemplary embodiment of the present invention.

6 is a view showing an initial state of the breaker lever driving unit according to an embodiment of the present invention.

7 is a flowchart illustrating an initial position control process of a breaker lever driving unit according to an embodiment of the present invention.

8 is a view showing an operating state of the breaker lever driving unit according to an embodiment of the present invention.

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

100: earth leakage breaker automatic recovery system 200: earth leakage breaker

210: breaker lever 212: bimetal

214: current transformer 300: earth leakage breaker recovery device

320: earth leakage breaker monitoring unit 330: control unit

340: breaker lever drive unit

The present invention relates to a ground fault circuit breaker, and more particularly, to a circuit breaker automatic recovery system capable of restoring the operation of the ground fault circuit breaker by distinguishing the cause of the electrical shock that caused the ground fault circuit breaker.

In general, an earth leakage breaker (ELB) is a safety device that is installed in a distribution panel and automatically cuts off the power when a leakage current such as a short circuit or a short circuit occurs.It is a safety accident such as an electric shock or a fire caused by a short circuit or an overcurrent and short circuit. It is a kind of electrical equipment used for the purpose of preventing the damage.

Such a circuit breaker is an electrical equipment that must be installed from the standpoint of protecting human life and protecting property, and the installation obligation is expanding in legal terms.

On the other hand, in recent years, various unmanned automated devices (for example, automatic air conditioners, mobile communication base stations, repeaters, etc.) have been developed and the spread of them is increasing. For example, an earth leakage breaker is separately installed to protect the device from short circuit, over current, short circuit, lightning, etc.

However, in the unmanned automated device as described above, the earth leakage breaker may be operated by electric shock. In such a case, when the unmanned automated equipment needs to be operated again due to the characteristics of the unmanned automatic equipment, a short circuit or remote worker must directly access the unmanned automatic equipment to restore the earth leakage breaker that cuts off the power.

In this case, the longer the operator is from the unmanned automated machine, the longer the time required to restart the unmanned automated machine, which reduces the operating efficiency of the unmanned automated machine and requires additional manpower to operate the unmanned automated machine. There was this.

If the ground fault breaker is activated and the supply of power is cut off, if the cause of the electric shock that caused the ground fault breaker is eliminated according to the abnormality of the supplied power, the ground fault breaker will be reset to the initial state (power supply state). It is urgent to develop an automatic recovery device for an earth leakage breaker for switching.

The present invention has been made to solve the above problems, an object of the present invention is to provide a circuit breaker automatic recovery system to recover the circuit breaker to the initial state by distinguishing the cause of the electrical shock that operated the circuit breaker. .

Hereinafter, a circuit breaker automatic recovery system according to the present invention will be described in detail with reference to the accompanying drawings. In the description of the present invention, the terms defined are defined in consideration of functions in the present invention, and should not be understood as meanings that limit the technical components of the present invention.

1 is an external view of an earth leakage breaker automatic recovery system according to an embodiment of the present invention.

Referring to FIG. 1, the circuit breaker automatic recovery system 100 is largely classified into a circuit breaker 200 and a circuit breaker recovery device 300.

The earth leakage breaker 200 is installed and used in a general switchboard (not shown) for the purpose of testing the circuit breaker lever 210 and the earth leakage breaker 200 which are operated by the cause of a short circuit, a short circuit, a lightning strike, an overload, and the like. And a test switch 220 for operating the breaker lever 210.

The earth leakage breaker recovery device 300 automatically receives the signal from the earth leakage breaker 200 when the breaker lever 210 of the earth leakage breaker 200 is tripped, and automatically recovers the breaker lever 210 of the earth leakage breaker 200. The breaker lever drive part 340, the display part 360, and the operation part 370 are provided externally.

Figure 2 is an exploded perspective view of a breaker lever driving unit according to an embodiment of the present invention.

As shown in FIG. 2, the breaker lever driver 340 includes a drive motor 342 driven according to a control signal from a controller, a bracket 344 for supporting the drive motor 342, and a drive motor 342. Is provided on the rotating shaft of the rotating motor 342 when the operation of the circuit breaker 200 of the circuit breaker lever 200 is moved up and down to move to restore or operate the rotating arm 346 is composed of a rotating arm 346 A pair of drive levers 346a and 346b and the pressing protrusion 346c are provided. As will be described later, the pressing protrusion 346c controls the initial state of the driving motor 342 by pressing the limit sensor 348 on / off by rotating the rotating arm 346.

The display unit 360 is provided with a plurality of LED lamps 362 indicating the power applied state, the cause of the operation of the circuit breaker 200, an abnormality display, and the like, and a FND lamp 364 indicating the number of times of recovery.

The operation unit 370 is provided with a switching switch 372 for switching the operation of the system to a manual or automatic state, and a setting switch 374 for mode conversion and reset.

When the changeover switch 372 is switched to the automatic state, the automatic recovery function according to the present invention is performed. When the changeover switch 372 is switched to the manual state, only the earth leakage breaker 200 operates.

The setting switch 374 is used to set only one sensing operation such as a short circuit, an overcurrent, or to set an automatic recovery execution frequency, a warning sound designation, a reset, and the like, and can be implemented in various ways.

On the other hand, a protective cover (not shown) covering the earth leakage breaker 200 may be further provided, thereby providing a limit switch (not shown) for detecting the attachment or detachment of the protective cover to prevent a safety accident in advance. .

Preferably, the recovery device 300 is configured separately from the earth leakage breaker 200. It is possible to make low-cost maintenance by replacing the circuit breaker without changing the whole recovery device even if the circuit breaker itself has a problem by configuring an automatic recovery circuit regardless of the manufacturer of the circuit breaker.

3 is a circuit configuration diagram of an automatic recovery type ground fault interrupting system according to an embodiment of the present invention, and includes a ground fault breaker 200 and a ground fault breaker recovery device 300.

The circuit breaker 200 generally includes a circuit breaker lever 210, a bimetal 212, and an image current transformer (ZCT) 214, and detects and blocks an overcurrent using the bimetal 212, and performs an image current transformer 214. By detecting a short circuit by using a circuit, the bimetal 212 blocks the breaker lever 210 to the degree of bending by the heat generated when the current flows and the image current transformer 214 detects the degree of the current detected by a certain amount When a current greater than the current flows, it is amplified by the amplifier circuit 216 and the circuit breaker lever 210 is blocked by the solenoid 218.

In the present invention, the configuration of the general earth leakage breaker may be used as it is, and by determining the cause of the interruption by receiving a signal from the existing earth leakage breaker, it is possible to determine whether to recover the earth leakage breaker again or keep it in a blocked state. .

As another embodiment, the circuit breaker 200 is a function of lowering the circuit breaker lever 210 by immediately detecting an arc or spark generated in the circuit breaker using an ultraviolet sensor (not shown), also called a flame sensor. You can add

The earth leakage breaker recovery device 300 includes a power supply unit 350, an earth leakage breaker monitoring unit 320, a memory unit 380, a control unit 330, a breaker lever driving unit 340, an operation unit 370, a display unit 360, It consists of a warning unit 390, the detailed description of the components already mentioned in Figure 1 will be omitted.

The power supply unit 350 rectifies AC power into DC power to supply power to the ground fault breaker recovery device 300.

The earth leakage breaker monitoring unit 320 is a primary power detection unit 320a for detecting the presence of primary power cutoff, an overcurrent detection unit 320b for detecting the presence of overcurrent (short circuit, short circuit), an earth leakage detection unit for detecting whether a short circuit exists 320c, the secondary power detection unit 320d detects whether the secondary power is cut off, and the detected signals are transmitted to the control unit 330. The primary power detector 320a detects a primary power cutoff state due to a lightning strike, and the secondary power detector 320d determines whether the ground fault breaker 200 is operated from a power state supplied to the load 10. Done.

In particular, the signal supplied from the circuit breaker 200 is used to detect an overcurrent or a short circuit, for example, secondary power (AC +, AC-) signals, SHORT_IN_AC + signals, and LEAKAGE_IN_AC- signals. Alternatively, the circuit may be a secondary power supply (AC +, AC-) signal, a SHORT_IN_AC- signal, and a LEAKAGE_IN_AC + signal, depending on the circuit of the earth leakage breaker.

In detail, the overcurrent detecting unit 320b detects the overcurrent using the SHORT_IN_AC + signal and the secondary power AC- signal drawn from the screw 213 contacted by the bimetal 212a. The ground fault detecting unit 212c detects a ground fault using a LEAKAGE_IN_AC- signal and a secondary power supply AC + signal drawn from the input end of the solenoid 218. In general, when a ground fault occurs, a voltage is applied to the solenoid 218. One side of the input of the solenoid 218 is always connected to one of the secondary power lines, and the other side of the solenoid 218 is connected to the remaining lines of the secondary power supply through the amplifier circuit 216 when a short circuit occurs. This is why it is detected.

The memory unit 380 stores a recovery operation control program that performs a function of automatically restoring the circuit breaker 200 under a predetermined condition when the ground fault breaker 200 is operated, and stores data set under a predetermined condition, and operates the ground fault breaker 200. The cause and history information of the circuit breaker 20 operated are also stored.

The control unit 330 determines the cause of operation of the earth leakage breaker 200 according to the signal transmitted from the earth leakage breaker monitoring unit 320, reads a recovery operation control program stored in the memory unit 380, and a predetermined set time elapses. After the control signal is generated to control the circuit breaker lever driver 340 to recover the circuit breaker 200.

Thus, by setting the recovery and operation status of the earth leakage breaker appropriately according to the site situation, the earth leakage breaker due to one-time cause except for the case where the manager must directly grasp and take measures in the field while ensuring safety. The operation of the 200 can be automatically restored without going directly to the site.

To this end, certain conditions according to the recovery state of the earth leakage breaker, such as a set time and a set number of times, are previously stored in the memory unit 380 as data.

In addition, the cause of the operation of the circuit breaker 200 and the history information of the operation of the circuit breaker 200 are recorded in a nonvolatile memory, for example, so that power can be checked even if the power supply is not restored.

The circuit breaker lever driver 340 moves the circuit breaker lever 210 of the ground fault circuit breaker 200 upward and downward by a drive motor 342 driven by a control signal generated by the controller 330 to restore or operate the circuit breaker lever 340. .

On the other hand, Figure 4 is a configuration diagram of the overcurrent input signal converter according to an embodiment of the present invention, by separating the overcurrent signal from the circuit breaker 200 to adjust the level so that the control unit 330 can be used as an input signal.

The input voltage for overcurrent detection (primary side power supply, secondary side power supply and short circuit detection) comes from the same voltage as the primary side power supply. That is, if the primary power supply is 220V, the voltage should be reduced to 220V. First, the AC voltage is full-wave rectified through the bridge diode (W06M), and the voltage applied to the resistor 2.2K ohms (R2) is = (bridge diode Output voltage) * (2.2K (82K + 2.2K)). The voltage V2.2K applied to the resistor 2.2K ohms R2 operates the light emitting diode of the photocoupler PC817 input. Immediately after operation, the voltage across the collector terminal of the photocoupler PC817 drops from 5V to 0V.

Input signals for detecting primary power, secondary power, and short circuit are also provided to the controller 330 after such a process, and the controller 330 determines the input signals in real time to control the recovery operation. Please note.

Referring to the operation of the earth leakage breaker automatic recovery system according to an embodiment of the present invention configured as described above are as follows.

Earth leakage breaker automatic recovery process

Figure 5 is a flow chart illustrating the operation of the circuit breaker automatic recovery system according to an embodiment of the present invention.

When the earth leakage breaker 200 is not operated (the breaker lever is located on the upper side), the various loads 10 operate normally by supplying power, and at this time, the drive motor 342 of the breaker lever drive unit 340 is also initialized. It is in the state (S100). In the initial state of the drive motor 342, as shown in FIG. 6, the structure connected to the drive motor 342, that is, the pivot arm 346 and the drive lever 346a, do not come into contact with the breaker lever 210. 6).

While the driving motor 342 is in the initial state, the earth leakage breaker monitoring unit 320 monitors the operation of the earth leakage breaker 200 (S110), for example, by determining whether the secondary power is cut off. have.

When the ground fault circuit breaker 200 is operated (the circuit breaker lever is located at the lower side), the controller 330 determines the cause of operation of the ground fault circuit breaker 200 according to the signal transmitted from the ground fault circuit breaker monitoring unit 320, and then, If it is determined that the recovery attempt is necessary, the controller 200 generates a recovery attempt control signal for controlling the breaker lever driver 340 (S120).

When the control unit 330 generates a control command upon recovery, the breaker lever driver 340 recovers the circuit breaker 200. First, the drive motor 342 is driven in a clockwise direction so that the breaker lever 210 is driven. Then, the drive motor 342 is driven counterclockwise so that the breaker lever 210 is fully raised. Here, the reason why the breaker lever 210 is completely lowered is because sometimes the breaker lever 210 does not completely fall, so no matter how much the breaker lever 210 is raised, no recovery is possible. Therefore, the breaker lever 210 is completely lowered and then a recovery attempt is performed.

In the normal state, the circuit breaker lever 210 of the earth leakage breaker 200 is positioned at the upper side to supply power to the secondary side, and the driving motor 342 is at an initial position.

The controller 330 monitors a short circuit and an overcurrent state in real time through the ground fault circuit breaker monitoring unit 320, and when the ground fault circuit breaker 200 operates, the cause is also identified in real time and displayed on the display unit 370.

Modes related to automatic recovery of earth leakage breaker include Mode 1 (Number of auto recovery attempts), Mode 2 (Earth or lightning), Mode 3 (Overcurrent, short circuit or short circuit), Mode 4 (Auto recovery setting frequency), Mode 5 (beep). It may be provided, and the mode conversion and setting is made in accordance with the operation of the setting switch 374.

If the circuit breaker 200 is not operated by a short circuit or a lightning strike, a recovery operation is started. When the secondary power is turned on, the number of times of automatic recovery attempt in Mode 1 is increased. The auto recovery attempts are closely related to the auto recovery settings in mode 4, and the auto recovery settings can be adjusted at any time by the user. If the number of automatic recovery attempts is the same as the current number of automatic recovery settings, no recovery attempt is made, and the user waits for recovery. If a person recovers randomly, the auto recovery attempts are reset to "0".

(1) Recovery procedure due to short circuit

If it is identified as a short circuit, it is displayed on the LED lamp 362 of the display unit 370 and the breaker lever driver 340 restores the ground fault breaker 200. At this time, the number of times of leakage of the mode 2 is increased. When the restoration is completed, the LED lamp 362 of the display unit 370 is turned off and the pivot arm 346 of the breaker lever driver 340 goes to the initial position.

(2) Recovery procedure due to overcurrent

When the earth leakage breaker 200 is operated by the contact of the bimetal 212 due to an overcurrent (short circuit or short circuit), an abnormality is displayed on the LED lamp 362 of the display unit 370, and no recovery attempt is performed. In addition, the FND lamp 364 of the display unit 370 sends a text of HH and at the same time generates a warning sound. However, it will return to normal only if the user recovers it at random.

(3) Recovery procedure due to lightning

In general, when the ground fault circuit breaker 200 is operated due to a lightning strike, the primary power is cut off within about 0.7 seconds after the secondary power is cut off. Therefore, in order to detect the operation of the ground fault circuit breaker 200 caused by such a lightning strike, the secondary power supply is discharged by the primary side power detector 320a and the secondary side power detector 320d of the earth leakage breaker monitor 320. After disconnection, the time when the primary power is cut off or when the secondary power is resupplied after the primary power is supplied again may be checked. For example, the controller 330 may store the count value in advance in the memory unit 380. ) May be configured to operate the circuit breaker lever driver 340 by recognizing a lightning strike. For example, after the primary power supply is resumed, if a predetermined condition is satisfied, for example, when the secondary power is supplied within 0.5 to 0.9 seconds, the controller 330 lightnings the cause of operation of the earth leakage breaker 200. It is judged that the recovery attempt is performed.

(4) Recovery procedure due to other causes

Even if a contact of the bimetal 212 occurs due to an overcurrent, the circuit breaker lever 210 of the ground circuit breaker 200 may not operate. This can be solved by determining whether the contact point of the bimetal 212 is generated and the earth leakage breaker 200 operates within a predetermined time.

As described above, in the present invention, since the controller 330 grasps the real-time situation before the ground fault circuit breaker 200 operates, whether the ground fault breaker or the overcurrent is caused immediately before the ground fault circuit breaker operation is determined. Recovery forms and attempts may vary. For example, in case of overcurrent (short circuit or short circuit), the user can limit the recovery attempt to the automatic recovery setting frequency in case of a short circuit, and in case of a short circuit, in case of a lightning strike, the user should limit the recovery attempt immediately. do.

Initial position control of drive motor

In order to raise or lower the breaker lever in the initial state of the drive motor, one must consider the overload problem caused by the drive more than necessary. One method is to determine the start time of the drive motor using the time delay. Since the position of the drive motor is always in the initial state, the raising and lowering times are determined proportionally to the structure. In particular, the initial position can be detected by using a sensor or a switch. If you detect an intermediate position, other positions can be determined in relative time. In the second method, when the driving motor is no longer raised or lowered, the current flowing through the motor increases due to an overload phenomenon, which is implemented as a signal. In this case, the circuit configuration can consist of a current-to-volt switching circuit that can convert the sensed current into a real-time voltage, and a comparator that can compare the voltage with a reference voltage, and instead of the comparator, It can also be used to compare with a reference value.

7 is a flowchart illustrating an initial position control process of a breaker lever driver according to an embodiment of the present invention, and FIG. 8 is a view illustrating a driving state of the breaker lever driver according to an embodiment of the present invention.

As shown in FIG. 8, the breaker lever driving unit 340 is configured to initially operate the driving motor 342 in such a manner that the pressing protrusion 346c presses the limit sensor 348 on / off when the pivoting arm 346 rotates. Control the state. For example, the limit switch is turned off when the pivot arm 346 is at the highest point, and the limit switch 348 remains on when the pivot arm 346 is between the lowest point at the initial position. The initial position control is performed according to the on / off state of the limit switch 348 (S200).

To go to the initial position when the limit switch 348 is on, turn the drive motor 342 counterclockwise until the limit switch 348 is turned off, and as soon as the limit switch 348 is turned off, the drive motor 342 ) Stops the operation and rotates clockwise again until the limit switch 348 is turned on, and stops the operation of the driving motor 342 as soon as the limit switch 348 is turned on (S210 ˜ S216).

To go to the initial position when the limit switch 348 is off, turn the drive motor 342 clockwise until the limit switch 348 is turned on, and as soon as the limit switch 348 is turned on, Stop the operation (S220 ~ S224).

Although described in detail with respect to the preferred embodiment of the present invention as described above, those of ordinary skill in the art, the present invention without departing from the spirit of the invention defined in the appended claims Various modifications may be made to the invention. For example, by providing a communication circuit (RS232, RS485, PLC, etc.) in the automatic circuit breaker automatic recovery system according to the present invention, the state of the ground fault circuit breaker (blocking due to short circuit, short circuit, or temporary interruption, etc.) is remotely located. It may be possible to communicate with any device provided.

As described above, the present invention receives the signal from the earth leakage breaker to determine in real time the cause of the blockage, and when it is determined that the one-time cause such as lightning or short circuit automatically recovers the earth leakage breaker and overcurrent (short circuit or short circuit) If it is determined to be the cause, it has the advantage of ensuring the safety by configuring to release the automatic recovery function of the earth leakage breaker. In addition, by configuring an automatic recovery circuit regardless of the manufacturer of the circuit breaker, even if a problem occurs in the circuit breaker itself, it is possible to replace only the circuit breaker without changing the entire recovery device, thereby enabling low-cost maintenance. In addition, the earth leakage breaker automatic recovery system of the present invention can achieve the operation efficiency and manpower saving of the device using the earth leakage breaker.

Claims (8)

An earth leakage circuit breaker that detects and blocks an overcurrent using a bimetal, and detects and blocks an electric leakage using an image current transformer; And When the ground fault circuit breaker is operated, the ground fault breaker recovery device may be configured to determine whether the ground fault breaker is recovered by determining a cause of the interruption by receiving a signal from the ground fault breaker; The earth leakage breaker recovery device, The earth leakage breaker monitoring system consists of a primary power detection unit for detecting the primary power cutoff, a secondary power detection unit for detecting the secondary power cutoff, an overcurrent detector for detecting the presence of overcurrent, and an earth leakage detector for detecting the short circuit part; A control unit for generating a control signal for determining the cause of operation of the earth leakage breaker according to the signal transmitted from the earth leakage breaker monitoring unit and for recovering the earth leakage breaker; And And a circuit breaker lever driving unit configured to recover the ground fault circuit breaker according to a control signal generated from the controller. The method according to claim 1, A protective cover for covering the ground circuit breaker and a limit switch for detecting the attachment or detachment of the protective cover is further provided with a circuit breaker automatic recovery system. The method according to claim 1, The circuit breaker circuit breaker automatic recovery system characterized in that it further comprises an ultraviolet detection sensor for detecting the occurrence of arcs or sparks in the circuit breaker. The method according to claim 1, The overcurrent detector detects an overcurrent using a first signal drawn from a screw contacted by the bimetal and a second signal drawn from a secondary power supply, and the ground fault detector is drawn from a solenoid input end for operating a circuit breaker lever. A circuit breaker automatic recovery system for detecting a short circuit by using a third signal and a fourth signal drawn from the secondary power supply. The method according to claim 1, The breaker lever driving unit is provided on a driving motor driven according to a control signal from the control unit, a bracket supporting the driving motor, and a rotating shaft of the driving motor to move the breaker lever of the ground fault circuit breaker up and down when the driving motor is operated. It is composed of a rotating arm for performing a recovery, the rotating arm is provided with a pressing projection on one side and a pair of driving levers on the other side, the pressing projection presses the limit sensor during the rotation of the rotating arm on / off The circuit breaker automatic recovery system characterized in that for controlling the initial state of the drive motor. The method according to claim 5, The circuit breaker lever driving unit rotates the pivotal arm to the lowest point and performs a recovery attempt after the circuit breaker lever is completely lowered. The method according to claim 1, The control unit is a point of time when the primary power is cut off after the secondary power is cut off by the primary power detecting unit and the secondary power detecting unit of the earth leakage breaker monitoring unit or when the secondary power is supplied again after the primary power is supplied again. Checking whether the earth leakage circuit breaker operation due to lightning strikes to perform a recovery attempt, characterized in that to perform a recovery attempt. The method according to claim 1, And the control unit controls to generate an alarm sound without attempting automatic recovery when an overcurrent detection signal is input from the overcurrent detection unit.

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