KR100538530B1 - automatic restoring machine for electric power - Google Patents

Abstract

The present invention is to shut off the power in the abnormal state, and to turn on the power again when the recovery of the normal state, to increase the safety of the operator during the maintenance work, to effectively remove the lightning on the incoming side to reduce the number of power cut off power to the load side Provides automatic power off / recovery device for stable supply.

The technical configuration of the present invention for this purpose is connected to the input of the input line of the power line and the load side of the contact to the input to supply power to the load side from the input side, or by disconnecting the contact to cut off the power supply to the load side; Sensing means for detecting an abnormal state from a load side power line; A manual switching input means for manually switching between a shut-off state in which load-side power is cut off and a normal state in which load-side power is supplied, and an input unit including input means for inputting setting values necessary for the breaking operation and the closing operation of the main switching unit; Storage means for storing the set value, and when the manual switching input means is switched to a normal state, an abnormal state is determined by comparing the signal sensed by the sensing means with the set value stored in the storage means; And outputting a cutoff signal for shutting off the main switching unit when it is determined that the abnormal state is detected, and an input signal for re-inserting the main switching unit after a delay time according to the set value after the cutoff signal is output. A control unit repeatedly outputting a predetermined number of times until the recovery to the normal state; A switch driver for driving the main switching unit by the cutoff signal and the input signal of the controller; It consists of a lightning protection unit consisting of a lightning protector that is grounded between the power line and the ground detachably installed on the substrate in order to absorb the lightning that flows into the input side of the power line.

Description

Automatic restoring machine for electric power}

The present invention relates to an automatic power off / recovery device for shutting off the power supply in an abnormal state against a surge such as a short circuit on the load side, an overload state, an lightning strike on the input side, and re-powering the power supply when the normal state is restored. Shut off the power in abnormal state and turn it back on when it recovers the normal state, but increase the safety of the worker during maintenance work, and efficiently remove the lightning on the inlet side to reduce the number of power cutoffs to supply the power stably to the load side. The present invention relates to an automatic power off / recovery device. Conventionally, in order to distribute the power to the customer from the power line to which the power is supplied, the effect of an electric accident such as a short circuit accident occurring in the customer is prevented from affecting the entire power system. In order to prevent the spread of equipment, power cut-off / recovery facilities have been installed at branch points of power lines and customers.

One type of power interruption / recovery facility is an earth leakage breaker, which responds to abnormal currents such as overcurrent, short circuit current, short circuit current, etc. in the power system of the customer, and operates the magnetic switch (or relay) for power off in response. This is blocked so that no more power is supplied to the consumer.

In addition, the abnormal current may be transient due to a transient state caused by a specific cause and may be temporarily restored to a normal state, or may be permanent due to a short circuit accident that cannot be restored to a normal state.

The earth leakage breaker is equipped with a recovery manual operation lever. When the power is cut off, the user operates the recovery manual operation lever to switch the contact of the magnetic switch to the input state connecting the inlet contact and the load contact. In case of electric current, the power line is normally restored, so the circuit breaker normally reapplies the power to the load side, but if the fault current is permanent, the cause of the fault current is not cured. The magnetic switch is cut off again by abnormal current, so power is not supplied to the load side. In this case, if the abnormal state is permanent, the magnetic switch should be kept in the disconnected state, find out the cause of the abnormal state, remove it, and then reinsert the manual operation lever for recovery.

In addition, the earth leakage breaker may not be installed only in a consumer such as a home, but may be installed to protect electrical facilities of a rare place such as a pumping station, an unmanned relay station, and a street lamp. The earth leakage breaker installed in such a place has a problem that a person must visit the earth leakage breaker site in order to insert a manual operation lever for recovery to recover when the power is cut off by an abnormal current.

In order to improve this problem, when a certain time elapses after the power is cut off in abnormal state, the magnetic switch is automatically turned on, and in case of temporary abnormal state, power is supplied and permanent abnormality is not restored to normal state. In the state of the art, an automatic power off / recovery device has been developed that allows the magnetic switch to be turned off.

Utility Model Registration No. 20-0285754 is an example of such an automatic power off / recovery device, and is constituted as shown in FIG. 1 and a layout shown in FIG.

Power is supplied or cut off from the power supply side to the load side by the blocking operation (OFF) or on (ON) of the magnetic switch 1. The load current detection unit 6 and the ground fault detection unit 7 detect an overcurrent state and a ground fault state according to the voltage and current of the power line on the load side, and are transmitted to the main control unit 13, and the main control unit 13 is connected to the main power control unit ( The control signal is transmitted to 8) so that the main power control unit 8 causes the magnetic switch 1 to perform a blocking or closing operation.

In addition, the power line is provided with an emergency recovery unit 9 composed of a power line and a switch branched in parallel with the magnetic switch 1 so that the emergency recovery power can be input by the switch, irrespective of the operation of the main power control unit 8 Is operated manually so that power can be supplied or cut off to the load side.

In addition, the main control unit 13 is connected to the limit switch 14 for inputting the number of times of recovery of the magnetic switch is re-inserted in the state of power cut off by the abnormal state, delay time re-inserted after being cut off, etc. The limit switch 14 is formed so that the screw groove is formed in the head so that the driver can change input from 1 unit to 9 units.

In addition, the lightning protector 2 is fixed on the same PCB substrate on which the down transformer 3, the power stabilizer 4, the signal safety amplifier 5, the load current detector 6, and the earth leakage detector 7 are installed. It is installed.

In addition, an operation unit 16 provided with a reset key and the like and a display unit 15 for displaying a delay time, a recovery frequency, and the like are provided on the outer surface of the apparatus.

Such a conventional automatic power off / recovery device includes the following problems.

(1) In the permanent abnormal condition, the operator should perform maintenance work. As soon as the worker removes the cause of the abnormal condition, the load side power line is switched to the energized state.

(2) Lightning protectors should be installed to be easy to replace because they are likely to be damaged by lightning, but they are difficult to repair because they are installed on the same PCB board as other electronic circuit components.

(3) Since the limit switch 14 can be changed from 1 unit to 9 units by a driver, the change range is limited.

(4) The emergency recovery unit 9 composed of a power line and a switch branched in parallel with the magnetic switch 1 has a large volume occupied by the switch because the power line must be directly turned on and off by the switch, and is damaged by arc or heat. There is concern.

(5) The lightning protector is installed in front of the DC power converter that converts AC power into DC power. It only protects against the lightning that flows into the DC power converter. The magnetic switch operates against the lightning that flows into the input side. There is a problem that the number of power outages to increase because it must be blocked.

The present invention was developed in view of the above problems, and an object of the present invention is to remove the cause of failure and work after the operator artificially cut off by manual switching input means for shutting off the load side power for maintenance work. The worker can work safely by maintaining the blocking state afterwards.

Another object of the present invention is to make the emergency recovery switch to operate the magnetic switch (or relay) without directly turning the power line on and off, to achieve a miniaturization compared to the switching unit for switching the conventional power line directly, It is intended to extend the life of the device by preventing it.

Still another object of the present invention is to install and install a lightning protection device to the PCB board with other electronic components, and to be detachably connected to facilitate maintenance, the lightning protection device is grounded by a separate ground wire separated from the case It is to increase the stability of and to supply the load to the load side by reducing the number of interruptions by preventing the magnetic switch from blocking the lightning by discharging the lightning coming from the input side to the ground.

Still another object of the present invention is to allow a delay time and a limited current to be input by input buttons connected to a control unit so that the input range is wide and the display unit can check various state values of the device.

Features of the present invention for realizing the above object is a main switching unit for supplying power to the load side from the input side by connecting the contacts of the input side and the load side of the power line, or the main switching unit to cut off the power supply to the load side by separating the contacts ; Sensing means for detecting an abnormal state from a load side power line; A manual switching input means for manually switching between a shut-off state in which load-side power is cut off and a normal state in which load-side power is supplied, and an input unit including input means for inputting setting values necessary for the breaking operation and the closing operation of the main switching unit; Storage means for storing the set value, and when the manual switching input means is switched to a normal state, an abnormal state is determined by comparing the signal sensed by the sensing means with the set value stored in the storage means; And outputting a cutoff signal for shutting off the main switching unit when it is determined that the abnormal state is detected, and an input signal for re-inserting the main switching unit after a delay time according to the set value after the cutoff signal is output. A control unit repeatedly outputting a predetermined number of times until the recovery to the normal state; A switch driver for driving the main switching unit by the cutoff signal and the input signal of the controller; It includes a lightning protection unit made of a lightning protector grounded between the power line and the ground detachably installed on the substrate in order to absorb the lightning flowing into the input side of the power line.

In addition, the present invention preferably further comprises an emergency recovery switch for stopping the operation of the control unit and at the same time operating the switch drive unit to switch the main switching unit into the input state.

Further, in the present invention, the sensing means includes a current detector for detecting a current on the load side, a voltage converter for converting the current detected by the current detector into a voltage, and a short circuit for detecting a leakage current from the current detected by the current detector. It is preferably made of an all-signal detecting unit, wherein the voltage converting unit and the short-circuit signal detecting unit are installed on one substrate separated from the substrate on which the lightning protection devices are installed.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

3 is an electric circuit diagram for explaining an embodiment of the present invention.

The automatic power off / recovery device 100 of the illustrated embodiment is installed between an input side and a load side of a power line to which power is applied, and connects a contact of an input power line and a load side power line to supply power to a load side, or The main switching unit 20 which cuts the power supply to the load side by separating the contact of the input power line and the contact of the load side, the lightning protection unit 21 for protecting the electric devices from abnormal current on the load side, lightning on the input side, lightning protection unit A ground line 22 for grounding 21, a current detector 23 for detecting a current flowing in the power line on the load side, and a current / voltage converter for converting the voltage into a voltage proportional to the current detected from the current detector 23 (24), a ground fault signal generator 25 and a current / voltage converter 24 for generating a ground fault signal when a ground fault occurs from the current detected by the current detector 23; Control unit 28, which receives an electrical signal from the leakage current detecting unit 25 and determines an abnormal state, outputs a cutoff signal in the abnormal state, and outputs an input signal after a predetermined delay time has elapsed; RUN / STOP button, which is a switching input means, an input unit 26 having a control button for inputting a delay time, a limited current value, etc. to the control unit 28, checking input values, or checking a state value of the load side; A display unit 27 for outputting an output signal from the control unit 28 by an operation of the input unit 26 and a switch driver for driving the main switching unit 20 by receiving a control signal from the control unit 28. 29) DC power supply unit 30, DC power supply unit 30 and switch driver 29 for converting the power supply of the input side to the dc power supply to supply the drive dc power of the control unit 28, the earth leakage signal generator 25, etc. Power supply between Operating a switch driver (29), regardless of the control signal of the control unit 28 to thereby consists of a emergency recovery switch 31 for operating the main switching section (20).

In this case, the main switching unit 20 uses a relay switch in the case of a small capacity according to the capacity of the load side, and in the case of more than a medium capacity, various switching devices such as a magnetic switch are used, but the present embodiment will be described on the premise of using the magnetic switch. do.

In addition, the controller 28 may include a PROM in which a CPU and a program setting an operation procedure are stored, EPROMs in which setting values input by the input unit 26 are stored, and elements and data connected to the control unit 28. It consists of interface units for input and output.

Further, the lightning protection unit 21 includes a lightning protector 21-1 for absorbing surges generated between power lines on the input side, a lightning protector 21-2 for absorbing surges generated between power lines on the load side, and each of the input sides. It consists of a lightning protector (21-3), (21-4) for absorbing the surge generated between the power line and the ground, the lightning protector (21-3), (21-4) is grounded by the ground wire (22) do. Lightning is absorbed by the lightning protectors 21-3 and 21-4 and discharged to the ground through the ground line 22 between each power line and the ground of the input side which have a great adverse effect on the load side, and the main switching is performed against the lightning strike on the input side. Since the unit 20 does not need to be cut off, more stable power supply is made to the load side.

In addition, the emergency recovery switch 31 is composed of a switch-type switch to switch the power between the DC power supply 30 and the switch drive unit 29 to cut off and input the power of the input side and the load side directly, but usually the DC power supply The contact point (contact point 2-3) is maintained to supply the low current power to the 30, and when the user judges that it is an emergency state and wants to turn on the power regardless of the operation of the control unit 28 or the like, the contact point 2 By switching to -1, the switch driving unit 29 is driven to switch the main switching unit 20 to the input state. At this time, the emergency recovery switch is not made to switch the power line, but is made small because it is a switch for switching the DC power supply unit 30 and the switch driver 29 through which a lower current flows than the power line. In addition, as shown in FIG. 4A, the case of the automatic power cut / recovery device 100 closes the front surface of the hexahedral fixing case 33 fixed to the wall and the fixing case 33 as shown in FIG. 4B. Or it consists of a top plate case 34 to be opened. Circuit elements are fixed to the bottom surface fixed to the wall of the hexahedral fixing case 33, and the current / voltage conversion unit 24, the earth leakage signal generating unit 25, the DC power supply unit 30, and the switch driving unit 29 The protection elements 21-1, 21-2, 21-3, and 21-4, which are provided on the PCB substrate 35 and form the lightning protection portion 21, are the PCB substrate 36. It is installed so that it can be detached and detached, so that each protection device can be separated and replaced in case of failure. In addition, a current detection unit 23 and a main switching unit 20 are provided at the center of the bottom surface of the fixed case 33. The input / output terminal block 32 is installed inside the center of the lower side wall of the fixing case 33, and the head of the tightening screw of the terminal block 32 is installed so as to face the front of the installer, thereby fixing the input / output power line to the terminal block 32. It is intended to be easy to make. In addition, an emergency recovery switch 31 is provided on the outside of the lower side wall so as to be operable in a state where the upper plate case 34 is not opened. In addition, a through hole is formed in the lower side wall so that the ground wire 22 is fixed to the packing and drawn out to the outside.

4B is an outer surface of the upper case 34, which is an input part 26 consisting of buttons of RUN / STOP, CUR, DELAY, UP, and RESET, and LEDs of IN and OUT and RUN / STOP, indicating the power status. A display unit 27 consisting of an LED installed corresponding to the CUR and DELAY buttons and an FND panel installed to display two numbers is provided.

In addition, the inner surface of the upper case 34 is provided with a control unit 28 is connected to the input unit 26, the display unit 27, the control unit 28 transmits and receives a signal with each element of the fixed case 33 .

5 shows a table for explaining the functions of the input unit 26 and the display unit 27.

The RUN / STOP button, which is a manual switching input means, is set to ON when load current is supplied in RUN state, and OFF state when load current is cut off. In order to input the condition condition to the control part such as limit current setting and delay time setting, the RUN / STOP button can be input only after the STOP state.In the state where the RUN / STOP button is RUN, the operation status such as the current value can be checked. have. Therefore, in FIG. 5, each element is described in which the RUN / STOP button is classified into a STOP state and a RUN state.

6 is a flowchart illustrating an input process in an embodiment of the present invention.

The LED IN lights in red when an AC voltage is applied to the lead-in side, and turns off when it is not applied. Since the limit current value or delay time is set in the RUN / STOP button in the STOP state, the RUN / STOP button should be switched to the STOP state by pressing the RUN / STOP button (S1) and (S2). In order to set the delay time in the STOP state, the DELAY button must be input (S3), and the delay time is changed and set as shown in FIG. 7 (S4). In addition, in order to change and set the limit current, the CUR button is input (S5), and the limit current value is changed and set according to FIG. 8 (S6). When the RUN / STOP button is pressed in the STOP state (S2), it is converted to the RUN state and the setting value can no longer be changed (S7).

7 is a flowchart illustrating a process for setting a delay time in an embodiment of the present invention.

In order to set the delay time, it must be in the STOP state, and there must be an input of the DELAY button as shown in FIG. As shown in FIG. 7 without inputting the DELAY button (S8), when the UP button is input, the number on the left side of the FND panel displaying two higher numbers is increased by 1 each time the UP button is input (S9). , (S10). In addition, when the DELAY button is input again (S8), when the UP button is input, the number on the right side of the lower setting unit, that is, the FND panel displaying two numbers is increased by +1 (S12) and (S13). When the DELAY button is input again, the setting value is stored (S15) and the delay time setting is finished.

8 is a flow chart for explaining the setting of the limit current value in one embodiment of the present invention.

To set the limit current value, the RUN / STOP button is made in the STOP state. In the STOP state, as shown in FIG. 6, the CUR button is input (S5), and when the UP button is input, the upper digit of the FND panel displaying two numbers is set by one each time the UP button is input. It is increased (S82), (S83).

In addition, the CUR button is input again (S81), and when the UP button is input, the number on the right side of the FND panel displaying two numbers is increased by 1 each time the UP button is input (S85), ( S86).

When the CUR button is input again (S84), the setting value is stored (S87) and the setting of the limit current value is finished.

9 is a flowchart illustrating an operation of a controller of an embodiment of the present invention.

When the RUN / STOP button is switched to the STOP state, the control unit 28 transmits a cutoff signal to the switch driver 29 so that the main switching unit 20 cuts off power supply to the load side (S91). When the RUN / STOP button is in the STOP state, the RUN / STOP button, the CUR button, and the DELAY button are input to change the limit current value and the delay time value according to the procedure shown in FIG. The data is stored in the storage area (28) (S93), (S94) and (S95).

Further, when the RUN / STOP button is switched to the RUN state (S91), the controller 28 compares the signal input from the current / voltage converter 24 and the ground fault signal generator 25 with the stored set value. It is determined that the load side is in an abnormal state (S97), and in the abnormal state, the main switch disconnection signal is transmitted to the switch driver 29 (S98). The controller 28 determines whether the elapsed time after blocking reaches the stored delay time when the main switching unit 20 is cut off (S99), and determines whether the main switch cutoff reaches the set number of times when the delay time is reached. If the set number of times is not reached, the switch driving unit transmits an input signal for turning on the main switching unit and returns to the RUN state in which the main switching unit is turned on (S100). If the number of cutoffs in step S100 is less than the set number of cutoffs, it returns to the RUN state and if an abnormal condition is detected again, the cutoff signal is transmitted to the main switching unit until the set number of cutoffs is reached. In case of recovery during the time, the power is normally supplied. However, if the abnormal state is not recovered even after the set number of times of interruption is reached, the main switching unit 20 maintains the state of interruption without returning to the RUN state any more (S101).

According to the present invention having the above object and configuration,

(1) If a permanent abnormality occurs in the load side power line, the maintenance personnel can enter the RUN / STOP button in the STOP state and repair the electric shock.

(2) In addition, the lightning protection units constituting the lightning protection unit 21 can be detachably installed on a separate board from other electrical components to be mounted, so that lightning protection devices having a relatively high damage rate can be easily replaced. By grounding them directly to the ground, the lightning strikes on the input side is released to the ground, so that a stable power supply is provided to the load side.

(3) In addition, since the emergency recovery switch can be compactly installed, manufacturing cost is low and the whole apparatus can be miniaturized.

(4) In addition, the delay time and the recovery frequency can be input by a button connected to the control unit so that the input range is wide and the display unit can display various element values of the device.

1 is a circuit diagram showing the configuration of a conventional automatic power off / recovery device.

2 is a layout view of components for illustrating the configuration of a conventional automatic power supply shut-off / recovery device.

3 is an electric circuit diagram for explaining an embodiment of the present invention.

4A is a component arrangement diagram installed in the fixed case of the present invention, and FIG. 4B is a component arrangement diagram of the upper case.

5 is a table for explaining the function by the button operation of the present invention.

6 is a flowchart illustrating an input process in an embodiment of the present invention.

7 is a flowchart illustrating a process for setting a delay time in an embodiment of the present invention.

8 is a flow chart for explaining the setting of the limit current value in one embodiment of the present invention.

9 is a flowchart illustrating an operation of a controller of an embodiment of the present invention.

Claims (3)

A main switching unit which connects a contact of an input side of the power line and a contact of a load side to supply power from the input side to the load side, or disconnects the contact to cut off the power supply to the load side; Sensing means for detecting an abnormal state from a load side power line; A manual switching input means for manually switching between a shut-off state in which load-side power is cut off and a normal state in which load-side power is supplied, and an input unit including input means for inputting setting values necessary for the breaking operation and the closing operation of the main switching unit; Storage means for storing the set value, and when the manual switching input means is switched to a normal state, an abnormal state is determined by comparing the signal sensed by the sensing means with the set value stored in the storage means; And outputting a cutoff signal for shutting off the main switching unit when it is determined that the abnormal state is detected, and an input signal for re-inserting the main switching unit after a delay time according to the set value after the cutoff signal is output. A control unit repeatedly outputting a predetermined number of times until the recovery to the normal state; A switch driver for driving the main switching unit by the cutoff signal and the input signal of the controller; And a lightning protection unit made of a lightning protection device detachably installed on a substrate grounded between the power line and the ground to absorb the lightning flowing into the input side of the power line. The apparatus of claim 1, further comprising an emergency recovery switch for stopping the operation of the control unit and operating the switch driving unit to switch the main switching unit to an input state. The current detecting unit according to claim 1 or 2, wherein the detecting unit comprises: a current detecting unit for detecting a current at the load side, a voltage converting unit converting the current detected by the current detecting unit into a voltage, and a leakage current from the current detected by the current detecting unit. An earth leakage signal detection unit for detecting the power supply, characterized in that the voltage converter and the earth leakage signal detection unit is installed on one substrate separated from the substrate on which the lightning protection devices are installed.