KR20070036678A - Centrally controlled automatic power saving apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully automatic power saving device using PLC, comprising: a programmable logic controller (PLC) for controlling a power system to collect an input information and an output information of a power system and maintain an optimal operating state; A converter for converting the information requested by the PLC into values recognizable by the PLC; A wireless modem for immediately transmitting an alarm situation occurring in the power saving device to an external system operator; A touch panel for outputting the operation and operation status of the power saving device to the screen to enable a visual confirmation of the system operator, the system operator inputs a command for optimal operation of the system to the PLC of the power saving device; A programming tool for creating a program for the PLC to control the system; It is a linear decompression device that has the capacity to remove the harmonics and noise generated in the power system to improve the quality of electricity, and to be able to automatically switch the taps when there are multiple taps installed, and to achieve the optimization of the system. Mutually induced reactors; A monitoring computer for monitoring, recording and remotely controlling the operation status of the power saving device in real time; And a communication card converting all the situations and operation commands required by the monitoring computer so that the PLC can recognize and attaching the PLC to the PLC.

 Reactor, Power Saver, PLC, Transducer, Power Analyzer, Wireless Modem, Touch Panel.

Description

Centrally controlled automatic power saving apparatus

1 is a block diagram of a general power saving device.

2 is a block diagram of a PLC used in the present invention.

3 is an application example of a power saving device according to the present invention.

4 is a block diagram of a power saving device according to the present invention;

5 is an exemplary view of a touch panel operation screen of the power saving device according to the present invention.

6 is an internal configuration diagram of a power saving device according to the present invention.

7 is an external configuration diagram of a power saving device according to the present invention.

8 is a control panel of the power saving device according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power saving device, and more particularly, to a central control power saving device implemented using a programmable logic controller and operating fully automatically.

First, the development background of the present invention, all products commonly used in the existing energy-saving device market adopts artificial and uniform voltage regulation method is operated by ignoring all factors such as region, time zone, use load type.

This phenomenon causes the loads operated under the power saving device to be in a severe power environment at some moment. As a result, energy-saving devices installed with a large amount of money shorten the life of the machine in a short time, and at some moments cause more power bills.

And today, despite the many products associated with energy savings and many support benefits, the reason why power saving devices are being taken out of the market is largely due to the fact that none of the above mentioned problems can be solved. Almost no investment in development is another reason.

In Korea, which relies solely on petroleum imports, the power-saving device must continuously solve the problems even in view of all the above negative factors, and there is an urgent need for efforts to develop and apply products suitable for the user's environment.

On the other hand, power saving is generally defined as saving electricity by increasing power efficiency while reducing the power consumption or suppressing unnecessary electricity consumption through power management. A general power saving device is an assistant to help the general public to realize the power savings, while a reactor, a main component of the power saving device, removes harmonics and noise that are frequently generated in the power system, thereby improving the quality of electricity. Power saving device. 1 shows a block diagram of a general power saving device.

In general, electrical equipment or facilities are designed to allow 1.3 to 1.5 times the margin in consideration of the safety factor and efficiency reduction required during start-up, thus consuming more electricity than the actual amount of work required. Power saving devices are reliable energy saving devices that save valuable electrical energy and extend the life of electrical equipment or equipment by effectively controlling the voltage and improving power factor within the normal operating range of the equipment. The standard voltage supplied from the power supplier is 233V ~ 207V within ± 13V (± 6%) of standard voltage for 220V in Korea, and ± 38V (± 10) for standard voltage in 380V. It is required to maintain 342V ~ 418V within%). The supply voltage varies regionally, and in general, the voltage is increased by considering the voltage drop on the wiring, but the voltage at the terminal is generally maintained and managed to have a deviation within the standard voltage range. In addition, the output voltage of the peripheral transformer is 230V.

In the case of electric equipment using 220V and 380V, it should not have any abnormality in the voltage range of ± 10% and it is manufactured to show the performance specified in the specification, so it is not a problem for normal operation. .

The operational problems of existing power saving devices in this environment are as follows:

First, after checking the input voltage at initial installation, it decides the power saving tap and starts the power saving operation with the determined tap.

Second, even if the input voltage changes, the set tap does not change until the operator changes it.

Third, even if the input voltage changes and the output voltage becomes fatal to the equipment operation, the power saving device operates without defense.

Fourth, the reactor and electric equipments in the power saving device are damaged by this condition, but the reactor and electric equipment in the power saving device are overheated due to the lack of safety devices that can control the power saving device. There is a recurring phenomenon of shortening and eventually returning to investors.

For this reason, the market for power saving devices, which have to carry out the national task, results in a strong planting of negative images, which in turn leads to overheating competition for small and home-oriented small markets. The stimulus of the bay became apparent.

The present invention aims to provide an efficient and economical power saving device by collectively solving the problems of the existing power saving device as described above.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the invention and the accompanying drawings.

1. Composition of invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully automatic power saving device using PLC, comprising: a programmable logic controller (PLC) for controlling a power system to collect an input information and an output information of a power system and maintain an optimal operating state; A converter for converting the information requested by the PLC into values recognizable by the PLC; A wireless modem for immediately transmitting an alarm situation occurring in the power saving device to an external system operator; A touch panel for outputting the operation and operation status of the power saving device to the screen to enable a visual confirmation of the system operator, the system operator inputs a command for optimal operation of the system to the PLC of the power saving device; A programming tool for creating a program for the PLC to control the system; It is a linear decompression device that has the capacity to remove the harmonics and noise generated in the power system to improve the quality of electricity, and to be able to automatically switch the taps when there are multiple taps installed, and to achieve the optimization of the system. Mutually induced reactors; A monitoring computer for monitoring, recording and remotely controlling the operation status of the power saving device in real time; And a communication card converting all the situations and operation commands required by the monitoring computer so that the PLC can recognize and attaching the PLC to the PLC.

In the present invention, the converter is a transducer or a power analyzer.

In the present invention, the PLC comprises at least a CPU, a main memory device, an input unit, an output unit, a calculation unit, an auxiliary memory device, a peripheral device, and an analog card.

In the present invention, it is preferable that the information requested by the PLC includes at least an input / output voltage, a current, a power factor, a frequency, an amount of power, and an abnormal signal.

In the present invention, it is preferable that the output unit of the PLC has a proper tap selection function, a mode switching function, an alarm generation function and an interlock function.

In the present invention, the operation screen output by the touch panel includes at least a main screen for monitoring the process, equipment monitoring screen, alarm monitoring screen and setting value input screen,

The main screen displays an input voltage, an output voltage, an output current, a frequency, a power factor, an operation mode, a power saving mode, an expected power saving rate, a device capacity, a power saving device operating rate, and also provides an emergency stop means;

The facility monitoring screen shows an input voltage, an output voltage, an output current for each phase in a three-phase power system, and indicates a frequency, an operation mode, and an expected power saving rate;

The alarm monitoring screen shows an alarm occurrence time, an alarm occurrence content and an alarm release time;

In the setting value input screen, the driver sets the output voltage for each phase by using the '+', '-' and 'confirmation' buttons, and the operation mode and the operation selection are automatically set to default values.

In the present invention, the communication card is preferably at least one communication method of RS-232C, RS-422, Ethernet, RS-485.

In the present invention, the voltage is adjusted in consideration of the region, time zone, and usage load, and the reactor capacity is preferably selected to be less than 1.3 times the amount of work actually required to achieve optimization within the normal operating range of the device. Do.

In the present invention, the secondary output voltage corresponding to the primary side input change of the reactor can be automatically adjusted, the voltage can be automatically adjusted in proportion to the voltage drop in accordance with the increase in the secondary use load of the reactor, the operation It is desirable to be able to keep records of the information and to output daily reports and monthly reports, and to allow unmanned operation through a remote control system.

2. Description of the composition and operation of the invention

By applying the mutual induction reactor, which is a unique linear pressure reducing device, to general power saving device, it is possible to bear the same power capacity with the capacity of 1/10 of the general transformer type, and the proper voltage and current without modifying or damaging the AC power. Can be controlled.

Meanwhile, the mutual induction reactor used in the present invention is classified into a primary voltage coil (main winding) and a secondary current coil (excitation winding) wound on a TOROIDAL CORE, and the voltage coil has a voltage regulating tap of several stages and a secondary current. The coil has a capacity of rated current and is wound in a reverse direction with the primary voltage coil, and the ends of the voltage coil and the current coil are connected in series to each other to perform a function of a series reactor. Therefore, if the current flows in the opposite direction to the secondary side while the voltage regulated in the primary voltage coil is applied to the reactor, the current is induced in the voltage coil by mutual induction. Therefore, the current rises in the voltage coil, and the raised current is supplied to the output side of the secondary current coil connected to the voltage coil.

In this case, the current flowing to the secondary output side is supplied to the load by adding the feedback back current, while the current on the input side drops. This is the basic principle of the mutually inductive reactor power saving device.

In the power saving effect by mutual induction, as the degree of decompression increases, the power saving rate increases, but the degree of decompression should be determined and operated according to the reactor efficiency and load conditions.

Now, the PLC used in the present invention will be described. PLC 100 used in the present invention is now widely used in the automation process of the industry, such as factory automation.

 As shown in FIG. 2, the configuration of the PLC 100 includes a CPU 10, a main memory 20, an input unit 30, an output unit 40, an operation unit 50, an auxiliary storage device 60, and a peripheral device 70. Consists of

Input unit 30 is the most basic of the PLC components are composed of those that can perform the type of actions that the PLC can recognize. Commonly, there are those that can be read as digital values such as operation buttons or various sensors, and those that can be read as analog values such as water level and temperature.

The output unit 40 appears as a form of directly operating an external device among the values calculated by the PLC, and outputs digital values such as opening and closing operations of the solenoid valve, starting and stopping of the motor, and analogues such as control valves. There is a form of exporting as a value.

The calculation unit 50 has a function of providing the processing value to the CPU through a separate job for the calculation processing such as mathematical calculation in consideration of the processing speed of the CPU (central processing unit) among the PLC jobs, which is in charge of the calculation unit.

The main memory 20 repeats the operation of reading the programmed program logic once from the beginning to the end in the PLC, reading and processing the input value, and outputting the order again from the beginning to the end. At this time, the main memory plays a role of remembering the input value.

PLCs come in many different grades, and there are many PLC manufacturers. Each company offers their own PLC programming tools. Therefore, in order to configure and program the PLC system of each manufacturer, only the programming tool of the manufacturer becomes available. As such, among the various PLC configurations, the main memory device has a large difference in ratings. As such, the main memory device has a feature that is defined in a given PLC class, and thus, the auxiliary memory device 60 is used for the smoother performance of the processing device.

The peripheral device 70 allows several major manufacturers to agree and communicate their products with each other in a market battle due to the diversification of PLC manufacturers. There is a possibility that the entire line may not be connected due to the wrong manufacturer for each equipment through communication. In this case, the user can integrate the entire equipment into one manufacturer's market, so that the market becomes uniform. Therefore, each manufacturer is concerned about this phenomenon and can communicate with each other through PLC through communication. I'm looking for a way. In addition, due to the development of computer equipment, the function of communication is further strengthened. As a result, the peripheral device 70 is increasingly increasing its role.

3 conceptually illustrates an application example of a power saving device used in the present invention. Assuming that the power saving device is used in the office, the power saving device is connected to the network through a PLC system. In addition, office equipment such as computers, telephones, mobile phones, computers in the operating situation room, and printers are also connected together. In this case, efficient power saving can be achieved by connecting the power saving device of the present invention to each electric appliance in the office through a network.

4 is a block diagram of a power saving device according to the present invention. Now, with reference to Figure 4 will be described the respective components of the power saving device and the operation principle of the device.

Power saving device 1000 of the present invention at least the PLC (100); Transducer or power analyzer 200; Wireless modem 300; Touch panel 400; Programming tool 500; It comprises a reactor 600 and a communication card 700. In the present invention, the PLC 100 is a device that is the key to the automatic operation of the power saving device 1000 is a device for controlling to maintain the most ideal operating state by combining the input information and output information of the power system.

In the present invention, the transducer (A, V, KW, PF, HZ) or the power analyzer 200 is a device for providing information required by the PLC 100 as input and output voltage, input and output current, power, power factor, frequency, It is a device that converts the measured values to analog (4-20mA, or 0-10V) value so that the PLC 100 can recognize various situations such as power amount.

As explained in the PLC section, the PLC interprets the input values by means of digital values (0 or 1), analog values, or communication.In the part indicated by the quantity, the analog values are read in order to read the periodic and continuous values. The value must be recognized and the PLC is equipped with an analog card 80 for this purpose.

Accordingly, the values provide information to the central processing unit 10 of the PLC 100 through the analog card 80 mounted on the PLC 100 through the transducer 200.

Wireless modem 300 is one of the most important equipment that can immediately deliver the alarm situation occurring in the power saving device 1000 to the external operator. Although a wireless communication means may be used for the power saving device 1000 of the present invention, it is not practically suitable for application in the field of the power saving device 1000. This is because, in the case of using radio frequency, the quantity and cost are not realistic enough to operate the system while satisfying existing laws and regulations such as frequency band, communication fee, and frequency licensing problem.

In order to monitor, record, and remotely control the operation status of the power saving device 1000 in real time from the operator computer, a monitoring computer 800 for operating it must be installed. It is necessary to convert the device so that it can be recognized. It is the communication card (RS-232C, RS-422 or ETHERNET CARD) 700 that performs this function.

At this time, the communication card 700 should be selected according to the communication method, and the short-range communication in the same operating area is mainly based on RS-232C or RS-422 communication, called serial communication. The ETHERNET method using the existing Internet line is applied. In addition, when multiple power saving devices or multiple computer operations are required, RS-485 communication called parallel communication is used. Since all the communication methods mentioned above are international standards, any type of PLC can be equipped with the appropriate communication card.

After the operator installs the power saver for the first time, the operator must give the command to the PLC of the power saver. Even if it simply converts to the power saving mode, the PLC to recognize the conversion itself must be recognized, and for this, we use a medium called the touch panel 400.

Existing power saving devices 1000 are manufactured by operating a substrate suitable for the company, using a material such as a switch, a selection button, a lamp as a method for operating selection. This allows the operator to simply select the KEPCO operation or the power saving mode operation, select the appropriate tap, and confirm the result with the lamp. Therefore, if the operator does not perform any operation again, the power saving device maintains the content of the first operation. In this case, when the operation of the power saving device is changed from the power saving mode to the power saving mode for some reason, the operator does not recognize the mode change without looking at the lamp, and it is not known what caused the change, and the power is put into the power saving mode again. Doing itself is insecure.

In the present invention, all these functions are collected and planted in a monitor called the touch panel 400 to select only the most necessary functions, and then the PLC 100 appropriately controls them.

In the touch panel 400, an operation state, various data, an error, an alarm history, and the like of the power saving device 1000 are textified or graphed. Therefore, the touch panel 400 may be referred to as a small computer that serves to enable the operator to easily recognize the operation history and the cause of failure of the power saving device 1000 and the current driving situation.

5 illustrates a touch panel operation screen of the power saving device according to the present invention, and the upper left screen illustrates a main screen for monitoring a process. In the main screen, input voltage, output voltage, output current, frequency, power factor, operation mode, estimated power saving rate, power saving device operation rate, and device capacity are displayed on the main screen.

The upper right screen of FIG. 5 illustrates a screen for monitoring a facility. This screen displays input voltage, output voltage, output current and frequency for each of the three phases (R, S, T phase), and the operating mode and expected power saving rate.

The lower left screen of FIG. 5 illustrates an alarm monitoring screen. This screen displays the alarm occurrence time, alarm occurrence details and alarm release time.

The lower right screen of FIG. 5 illustrates a setting value input screen. In this screen, the output voltage of each phase can be adjusted and the set value can be adjusted with '+', '-' and 'OK' button. 'Run Mode' and 'Operation Selection' were automatically set to default values.

The selectable screen provided by the touch panel is one of a main screen for monitoring a process, a facility monitoring screen, an alarm monitoring screen, and a setting value input screen. It also has means for emergency stop.

Since the PLC 100 is a device that repeats mechanical operation, it is necessary to determine various processes such as how to operate the device, what function to use, what complementary device to insert, and how to set the operation sequence. ) Is programmed in a language that can be recognized and stored in the PLC 100, and is determined by this program. What is needed for this is a programming tool 500 and consists of related software and hardware such as a notebook.

At this time, the core is the programmer's program, and one of the key advantages of the PLC 100 is that it is flexible enough to accommodate everything. The board attached to the existing power-saving devices should put the necessary functions when designing the board for the first time, and it is meaningless to want the contents that are not on the board. In other words, the power saving device that varies characteristics by capacity and the characteristics of the substrate applied uniformly due to the load characteristics only burden the machine. Therefore, all power-saving device makers eagerly tried to put various functions on the board at first, but now they do not apply anything other than the necessary functions.

The core of the power saving device 1000 is the reactor 600, and the most core of the power saving device 1000 operation is flexible tap switching and sufficient capacity selection. If proper tap switching is not made automatically according to the input / output voltage fluctuation, the power saving device may rather become a dangerous device for the lower load and the power saving device itself.

Unfortunately, the power saving device of the past consists of as many as five taps, although the importance of tap switching is emphasized, even though it is a manual operation. The power-saving industry has turned to the reality of eliminating tabs and forcing a 1: 1 dropout.

However, the present invention solves these problems by adopting the automatic tap switching function. Therefore, the risk of manual tap-changing disappeared. As a result, even a large power saving device can be safely operated.

Meanwhile, as the communication method of the present invention, one of one-way communication (simplex), half-duplex communication (Half-Duplex), and full-duplex communication (Full-Duplex) may be used.

One-way communication is a communication method in which the flow of information is constantly transmitted in one direction. In this way, information cannot be sent in the reverse direction.

In the half-duplex communication method, information flow cannot be sent in both directions at the same time by using a cable of one line, but can be transmitted in both directions at a time interval.

The full duplex communication method is a method in which information flow can be simultaneously transmitted and received using two-wire cables. Technically the most advanced way.

In general, the data transmission method is classified into the following two methods in consideration of speed, stability, and economics when transferring data in binary (binary consisting of 0 and 1).

The serial transmission method transmits data one bit over one cable. The transmission speed is slow, but the installation cost is low and the software is simplified. This includes RS-232C, RS-422 and RS-485.

Parallel transmission is a method used in printers, etc., which transmits data in units of 1 byte, and has a high speed and excellent data accuracy, but has a disadvantage in that the installation cost increases exponentially with a long transmission distance.

Asynchronous communication is a method of synchronizing one character at a time during serial transmission. At this time, the synchronization signal (clock signal, etc.) is not transmitted. The character code is sent with the start bit at the beginning of one character and the stop bit is terminated with the stop bit at the end.

A protocol is a communication rule that is defined between a transmitting and receiving party in advance in order to exchange efficient and reliable information without error between two or more computers and terminals. In general, it defines call establishment, connection, structure of message exchange format, retransmission of error message, line reversal procedure, and character synchronization between terminals.

Referring to BPS (Bits Per Second) and CPS (Characters Per Second), BPS refers to a transmission rate unit indicating how many bits per second are transmitted during data transmission, and CPS refers to the number of characters transmitted in one second. Since 1 character is 1 byte (8 bits), CPS is called the number of bytes that can be transmitted per second.

Node is a term that refers to a connection node of data in a network tree structure. Generally, a network is composed of many nodes. A node is represented by a station number.

Packet is a term used in a packet exchange method that transmits information by dividing it into packet units. It is a compound word of Package and Buket. A packet is a header indicating a counterpart address (eg, station number) by separating transmission data into a predetermined length.

Port refers to a part of a data processing device that receives or sends data from a remote terminal in data communication, and means a RS-232C or RS-422 port in Cnet serial communication.

RS-232C is an interface for connecting modem and terminal or modem and computer. It is a serial communication standard established by EIA in accordance with CCITT's recommendation. It is used to connect directly to null modem as well as modem connection. The disadvantage is that the transmission distance is short and only 1: 1 communication is possible, and the specifications that overcome the disadvantages are RS-422 and RS-485.

RS-422 / RS-485 is a serial transmission standard, which has longer transmission distance and 1: N connection than RS-232C. The difference between the two specifications is that RS-422 uses four signal lines: TX (+), TX (-), RX (+), and RX (-), whereas RS-485 uses two (+) and (-) signals. Since it has a signal line, transmission and reception can be performed through the same signal line. For this reason, RS-422 performs full-duplex communication and RS-485 performs half-duplex communication.

Half duplex communication is available in both directions, but at the same time, it is not possible to transmit and receive. Since transmission and reception are performed through one communication line, it is widely used in a multidrop communication method in which several stations communicate through one signal line. Since this communication method uses one signal line, if multiple stations transmit at the same time, data loss may occur due to data collision. Therefore, it is called half duplex because multiple stations cannot transmit at the same time and transmit one by one.

Full-duplex communication is a communication method that can simultaneously transmit and receive in both directions, and RS-232C and RS-422 communication method. Since the transmission line and the receiving line are separated, it is called full duplex communication because it can transmit and receive between the master station and the corresponding station at the same time without data collision.

On the other hand, because BCC (Block Check Character) can transmit a distorted signal due to the effect of unwanted noise on the transmission line, the BCC can determine whether the signal is normal or distorted. As the data for receiving, the receiving side may calculate the BCC by using the data entered up to the front end of the BCC, and then compare the received BCC to determine whether the signal is abnormal.

Frame is composed of transmission and reception data in a certain format in data communication. This includes additional information such as segment (station number, command, parameter according to command), control character (ENQ, ACK, EOT, ETX) for synchronization, parity for error detection, BCC and the like.

6 shows an internal configuration of the power saving device according to the present invention, FIG. 7 shows an external configuration of the power saving device according to the present invention, and FIG. 8 shows an operation panel of the power saving device according to the present invention.

As such, the present invention may be variously modified and may take various forms, and only the specific embodiments thereof are described in the detailed description of the present invention. It is to be understood, however, that the present invention is not limited to the specific forms mentioned in the detailed description of the invention, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood to do.

The effects that can be expected from the power saving device according to the present invention described above are largely reliable, stable, economical and convenience, and their details are as follows:

First, the secondary output voltage corresponding to the primary input change can be adjusted automatically.

Second, it is possible to automatically adjust the voltage in proportion to the voltage drop according to the increase of the secondary use load.

Third, it is possible to configure a user-oriented screen for power saving device operation information.

Fourth, the operation and operation status of the power saving device are visually confirmed through the monitoring screen. In addition, since the power saving device is artificially configured, there is convenience.

Fifth, record keeping and daily report and monthly report on driving information are possible.

Sixth, unmanned operation through remote control system is possible.

Seventh, uninterrupted operation is possible by securing the automatic bypass function, thereby improving the reliability of the power system.

Eighth, complete circuit protection is possible with the lowest operating voltage setting on the secondary side, ensuring stability.

Ninth, since the stable power saving rate is guaranteed, it is possible to optimize the payback period for investment and thus economical.

Claims (9)

A programmable logic controller (PLC) for controlling the power system to collect an input information and an output information of the power system and maintain an optimal operating state; A converter for converting the information requested by the PLC into values recognizable by the PLC; A wireless modem for immediately transmitting an alarm situation occurring in the power saving device to an external system operator; A touch panel for outputting the operation and operation status of the power saving device to the screen to enable a visual confirmation of the system operator, the system operator inputs a command for optimal operation of the system to the PLC of the power saving device; A programming tool for creating a program for the PLC to control the system; It is a linear decompression device that has the capacity to remove the harmonics and noise generated in the power system to improve the quality of electricity, and to be able to automatically switch the taps when there are multiple taps installed, and to achieve the optimization of the system. Mutually induced reactors; A monitoring computer for monitoring, recording and remotely controlling the operation status of the power saving device in real time; And And a communication card for converting all the situations and operation commands required by the monitoring computer to be recognized by the PLC and having a communication card attached to the PLC. The apparatus of claim 1, wherein the converter is a transducer or a power analyzer. The automatic power saver device of claim 1, wherein the PLC includes at least a CPU, a main memory device, an input unit, an output unit, an operation unit, an auxiliary memory device, a peripheral device, and an analog card. The apparatus of claim 1, wherein the information requested by the PLC includes at least an input / output voltage, a current, a power factor, a frequency, an amount of power, and an abnormal signal. The automatic power saving device using PLC according to claim 1, wherein the output unit of the PLC has a proper tap selection function, a mode switching function, an alarm generation function, and an interlock function. The operation screen of claim 1, wherein the operation screen output by the touch panel includes at least a main screen for monitoring a process, a facility monitoring screen, an alarm monitoring screen, and a setting value input screen. The main screen displays an input voltage, an output voltage, an output current, a frequency, a power factor, an operation mode, a power saving mode, an expected power saving rate, a device capacity, a power saving device operating rate, and also provides an emergency stop means; The facility monitoring screen shows an input voltage, an output voltage, an output current for each phase in a three-phase power system, and indicates a frequency, an operation mode, and an expected power saving rate; The alarm monitoring screen shows an alarm occurrence time, an alarm occurrence content and an alarm release time; In the setting value input screen, the driver sets the output voltage of each phase by using the '+', '-' and 'OK' buttons, and the operation mode and the operation selection are automatically set to default values. Fully automatic power saving device using PL. The apparatus of claim 1, wherein the communication card uses at least one communication method among RS-232C, RS-422, Ethernet, and RS-485. The method of claim 1, wherein the voltage is adjusted in consideration of the region, time zone, and load type, and the reactor capacity is selected to be less than 1.3 times the amount of work actually required to achieve optimization within the normal operating range of the device. Fully automatic power saving device using PLC. The method of claim 1, wherein the secondary output voltage corresponding to the primary input change of the reactor can be automatically adjusted, and the voltage can be automatically adjusted in proportion to the voltage drop due to the increase in the secondary use load of the reactor. It is possible to keep the record and the daily report, the monthly report output for the operation information, characterized in that the unmanned operation through the remote control system, automatic power saving device using PLC.

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