KR20140121593A - Power quality recovery relay - Google Patents

Power quality recovery relay Download PDF

Info

Publication number
KR20140121593A
KR20140121593A KR1020130037969A KR20130037969A KR20140121593A KR 20140121593 A KR20140121593 A KR 20140121593A KR 1020130037969 A KR1020130037969 A KR 1020130037969A KR 20130037969 A KR20130037969 A KR 20130037969A KR 20140121593 A KR20140121593 A KR 20140121593A
Authority
KR
South Korea
Prior art keywords
power
phase
control signal
image
line
Prior art date
Application number
KR1020130037969A
Other languages
Korean (ko)
Inventor
김경섭
김나운
김인태
Original Assignee
(주)대신파워
김나운
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by (주)대신파워, 김나운 filed Critical (주)대신파워
Priority to KR1020130037969A priority Critical patent/KR20140121593A/en
Publication of KR20140121593A publication Critical patent/KR20140121593A/en

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
    • G01R19/16509—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed using electromagnetic relays, e.g. reed relay
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by unbalance of two or more currents or voltages, e.g. for differential protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for three-phase systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
    • H02H3/253—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for multiphase applications, e.g. phase interruption

Abstract

The present invention relates to a power quality recovering relay which has a purpose to recover the quality of power to normal power which has been degraded due to an open-phase of a power line/reverse phase of the power line/open-phase of a neutral line/voltage imbalance and current imbalance, unbalanced overvoltage, unbalanced overcurrent, and increased zero-phase harmonic waves. The power quality recovering relay of the present invention connects to a power supply device which supplies power through a distribution system, and includes a control unit which outputs a control signal to operate a switch connected to the power line in order to recover the open phase and the reverse phase to the normal when the open-phase and reverse-phase states are detected.

Description

Power quality recovery relay

The present invention relates to a method and apparatus for reducing power quality due to open-phase / reverse phase / neutral-line / voltage imbalance and current imbalance and unbalanced overvoltage, unbalanced overcurrent, More particularly, power line imaging, reverse phase, and neutral line imaging occur in the power distribution system, and voltage unbalance, current unbalance and unbalanced overvoltage, unbalanced overcurrent, image harmonic increase The control signal is output to maintain the normal voltage and to output the control signal which interrupts the ground fault and the overcurrent to monitor the power quality of the load to be maintained at the normal power, It reduces power consumption by attenuating image harmonics, and at the same time, it is able to reduce the power consumption by overcoming phase, reverse phase, voltage unbalance, overcurrent due to current unbalance, It relates to a power quality recovery relay for outputting a control signal so as to prevent electrical accidents caused by harmonics.

Generally, a power transformer is installed in a power system to convert the voltage to supply to the customer. However, the transformer and the electric motor due to the occurrence of power line, neutral line image or reverse phase, unbalanced over voltage, unbalanced over current, image harmonic, over current, ground fault, The power loss is increased due to the deterioration of the power quality and the increase of the image harmonics due to the increase of the nonlinear load. In recent years, the harmonic reduction device is installed.

Open-phase refers to power line image formation or neutral line image formation. When an image is formed, unbalanced power (voltage, current) is generated and overvoltage and overcurrent are generated. As a result, an electric accident occurs, Power outages are caused and electricity like the arteries of the information age is paralyzed, resulting in a great inconvenience to the lives of the people.

The reverse phase means that the rotation of the rotating device is changed abnormally due to the change of the phase of the electric power. Generally, the reverse phase is used to supply the electric power in the opposite phase to the forward phase to use the forward and reverse rotation of the motor. The reverse mechanism is a general technique for turning off electricity by using a conventional counter-phase relay.

Harmonics refers to a frequency corresponding to an integer multiple such as 2, 3, or 4 times the fundamental frequency, and is called a distortion or a distorted wave. Especially, in a high frequency of several orders, such as 3, 6, 9, A high frequency component corresponding to a multiple of 3 is referred to as an image harmonic.

The characteristics of the distribution system of Korea which adopts 3 phase 4 wire system is that single phase load and 3 phase load are mixed and unbalanced current flows in the neutral line. Recently, computer, LED, lighting equipment, office equipment such as copying machine, uninterruptible power supply (UPS) due to the increase in the number of nonlinear load devices, more neutral image lines will flow more harmonics. Image harmonics are superimposed on the neutral line, and image harmonics up to 3 times flow. If excessive image harmonics flow in the neutral line, it will cause problems such as overheating of neutral conductor, performance deterioration of distribution transformer, voltage distortion, communication line noise, and malfunction of electric / electronic equipments.

Accordingly, various methods have been proposed for harmonic reduction apparatus for attenuating excessive image harmonics. Among them, three zigzags connected to a phase line and a neutral line are used to reduce the image impedance so that the image harmonics from the neutral line to the load system side This is a typical device that compensates for image harmonics by absorbing it into the zigzag wiring transformer side. In this way, the image harmonic filter using the zigzag wiring transformer can effectively attenuate the third order harmonic, which has the highest generation amount, of the low order.

A conventional technique for protecting a power line or a neutral line image formation and a reverse phase load is disclosed in Korean Patent Registration No. 10-1246886 entitled " Prior Art 1 " (Hereinafter referred to as " prior art 2 ") and Korea Patent Office Publication No. 10-1084104 entitled " (Hereinafter referred to as " Prior Art 3 "), which is incorporated herein by reference in its entirety.

The disclosed prior art 1 is related to a power supply apparatus having a main breaker and a distribution breaker (MCCB) as a distribution panel having a neutral line protection function, and when an excessive current flows into a neutral line of the power supply apparatus, To detect an image of the neutral line of the power supply device, to determine that the neutral line is disconnected when the neutralization line is detected, to connect one end of the inductance to the neutral line for recovery, And a neutral line restoring device for preventing the occurrence of the abnormal voltage and maintaining the normal voltage.

In the related art 2, a plurality of image forming relays are provided for each section so as to be able to automatically detect the occurrence of image formation during operation of the image forming relay, so that the image forming apparatus can have an image forming detection selection blocking function. It is possible to know the location of the fault immediately in the event of a fault, so that it is possible to shorten the time for repairing the fault as well as urgent emergency measures, so that a power failure occurs, but the power failure time can be reduced.

Also, the disclosed Prior Art 3 relates to a relay, which detects a reverse phase or a phase difference of a power source supplied to a three-phase load device so as to cut off the supplied power, safely protects the internal electronic device from a power source, To the user, and stops power supply when a reverse phase and a phase are generated, thereby generating a power failure.

Patent Registration No. 10-1246886 (Title of invention: distribution front with a neutral protection function) Korean Patent Registration No. 10-1084104 (entitled "High and low voltage switchgear with selective phase detection selective blocking function) Korea Patent Office Registration No. 10-0883771 entitled "Electronic Relay for Reversed Phase and Phase Image Protection"

However, the conventional techniques described above have the advantage of protecting the load by cutting off the power during the power phase-up and the reverse phase. However, the countermeasures against the power failure are not taken at all and the problem of paralyzing electricity, which is almost the same as the artery of the information age, The unbalance of the power causes a problem that the transformer is burned out, the load is burned out, the electric fire occurs, the power quality is lowered, and the electric power is wasted.

Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art,

A problem to be solved by the present invention is to prevent the generation of power failure due to overvoltage, overcurrent and reverse phase by operating a power quality restorer when power line open-phase or reverse phase occurs in the power distribution system, The control signal is output to restore the voltage, the transformer is prevented from burnout by maintaining the unbalance of the load power of each phase at the equilibrium, and the power of the power is saved by attenuating excessive image harmonics generated in the neutral line. A power quality recovery relay for outputting a control signal to enable the power quality recovery relay to output a control signal.

Another problem to be solved by the present invention is to detect a neutral line abnormality and to output a control signal for operating the power quality restorer when a neutral line abnormality is detected and to provide an unbalanced overcurrent, And to provide a power quality recovery relay that outputs a signal to prevent a disaster caused by a voltage unbalance and a current unbalance by allowing a normal voltage to be maintained.

Another problem to be solved by the present invention is to prevent the transformer from being burned out by operating the power quality restorer so that the load current for each phase is maintained at an equilibrium state when the load currents of the respective phases are detected, And outputting a signal to increase the power quality of the power supply.

Another problem to be solved by the present invention is to provide a power supply for outputting a signal so as to reduce an image harmonic by operating an electric power quality restorer when an excessive current flows or an image harmonic is detected by detecting a current flowing in each phase current and a neutral line, Quality recovery relays.

Another problem to be solved by the present invention is that the power line image formation, reverse image, neutral line image formation, and image harmonics increase even after outputting the control signal for operating the power quality restorer due to the power line image formation, the reverse phase neutral image formation, And outputting a control signal so that power can be cut off.

Another object of the present invention is to provide a power quality recovery relay that outputs a signal to cut off power when an overcurrent or a ground fault current occurs in the load.

Another problem to be solved by the present invention is to output an alarm signal for providing information to be verified by the time and the auditory sense corresponding to the real time when the power quality restorer operates or over current or ground fault occurs due to the above problems, And to provide a power quality recovery relay that can be quickly repaired before a disaster occurs.

In order to solve the above-mentioned problems, the power quality restoration relay according to the present invention is designed to prevent energy loss and electric disaster caused by power line image formation, reverse phase, neutral line image, image harmonics increase, overcurrent, overvoltage, A relay for outputting a control signal for outputting a control signal,

In order to recover the phase of the power line and the phase of the reverse phase of the power line provided to the power supply apparatus and to recover the phase of the phase line and the phase of the reverse phase of the power line, And transmits a power cutoff control signal to the switch or the breaker connected to the load when the generation of the opposite phase to the image formation is detected even after the reset control signal is outputted to the switch And a control unit.

Wherein,

A phase detector for detecting whether or not an image is formed on the power line;

A voltage detector for detecting the phase of the neutral line and whether the voltage is unbalanced;

A current detector for detecting a current value flowing through the power line and the neutral line;

And a phase detector for detecting the phase of the neutral line when the voltage unbalance is detected by the voltage detection value outputted by the voltage detector, The current detection value outputted by the detector is compared with the reference set value which is determined in advance and whether or not the unbalanced overcurrent and ground fault state of the differential load and the occurrence of the image harmonic and the load side overcurrent are determined, A controller comparing the increase, overcurrent, and ground fault of the image harmonics with a reference set value; The control signal output unit outputs recovery information provided by the controller when the power line image formation, reverse image, neutral line image formation, power unbalance, image harmonic generation, or unbalanced overcurrent, A control signal for restoring the power quality based on the information and a control signal for cutting off the power at the time of the ground fault and a control signal for recovering the power quality are simultaneously generated and a control signal for alarming is generated at the same time. And a control signal output unit for generating a control signal for shutting off the power.

Wherein the control signal generator comprises:

The controller detects the output value detected by the plurality of current detectors provided in the controller and compares the detected output value with the reference set value in the controller. If the controller determines that an overcurrent or a ground fault has occurred, And generates a control signal for controlling the display device.

Wherein the control signal generator comprises:

And the control signal generation time is adjusted using the timer for the power quality recovery and the power cutoff signal received from the controller.

The power quality recovery relay includes:

And a device for displaying the detected values detected and output by the detectors so that they can be visually confirmed.

The control signal generator

When the power line image forming signal is transmitted to the controller, the image forming apparatus cuts off the primary power of the power source on the power source side so that the phase of the power recovered by the power quality restorer passes through the primary of the power line And does not supply power to an image-formed phase of a load other than a load to be restored.

The effect of the present invention is to provide a signal to the switch to restore a steady state of power line imaging, reverse phase, neutral line imaging, voltage imbalance, current imbalance and image harmonics to the switch to connect the power quality restorer to the power line, It can prevent the waste of electric power by significantly reducing the loss of electric energy caused by the deterioration of electric power quality due to reverse phase, overvoltage, overcurrent and image harmonics and by supplying electric power with improved quality to the load side, In addition, it can extend the service life of power distribution line and transformer with stable power supply, and real-time self-restoration in case of power failure, so that damage caused by power failure does not occur. By visually confirming the contents of the fault and repairing it promptly, the electric There is an effect to prevent the unintentional.

1 is a power quality recovery relay diagram according to a preferred embodiment of the present invention,
Figure 2 is a schematic diagram of a power quality recovery relay,
3 is a circuit diagram of a hybrid transformer,
4 is a schematic circuit diagram of the power quality restorer.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 1 is a diagram of a power quality recovery relay 200 according to a preferred embodiment of the present invention, and FIG. 2 is a block diagram of a power quality recovery relay 200, A recovery unit 100 and a power quality recovery relay 200.

When the power quality recovery relay 200 is implemented as a single module and commercialized, it can be easily applied to existing power equipment.

The power supply unit 300 means a general power supply unit 300 that supplies three-phase four-wire type (R, S, T, N) or three-phase three-wire type (R, S, T) .

The power quality recovery relay 200 is connected to a power supply 300 that supplies power through a three-phase four-wire system (R, S, T, N) or a three-phase three-wire system (R, S, T) (R, S, T, N) load currents (R, S, T, N) are detected by detecting an abnormal state of the power lines M2, and M3 provided in the power quality restorer 150 are operated to detect an image phase, a reverse phase, and a voltage unbalance at a normal voltage level Transforms current imbalance into current equilibrium, attenuates image harmonics, prevents overvoltage and overcurrent due to power line or neutral line abnormality, maintains normal voltage and steady current, and reduces power by reducing image harmonics. Power quality restorer 150 that performs the function of saving And it outputs a control signal.

The power quality recovery relay 200 includes a phase detector 210 for detecting the phase (R, S, T, N) voltage and phase angle to detect whether or not the phase difference is opposite to the power line image phase; A voltage detector 220 for detecting an abnormal state of the neutral line and an unbalanced overvoltage; A current detector 230 for outputting a current detection value detected by a plurality of current transformers R, S, T, and N of a power line provided in the power supply 300; The phase detector 210, the voltage detector 210, and the current detector 220, and a voltage detection value and a current detection value, and compares them with the reference set value, If the result of the determination is determined to be an increase in the phase, reverse phase, neutral line, unbalance, and image harmonics, the power quality recovery information for phase recovery or reverse phase recovery or neutral line recovery, power unbalance recovery and image harmonic reduction, A controller (250) for outputting power abnormality information for interrupting the generation of the power abnormality information; A memory for receiving and storing power abnormality information output from the controller to the controller; A display for visually displaying a detection value provided by the detectors; The power quality restorer 150 that restores the images, restores the inverse phase, restores the power imbalance, or reduces the image harmonics according to the restoration or blocking information output from the controller 250 And a control signal output unit 260 for outputting a control signal for shutting off the power when the power quality abnormality is detected even after outputting a signal for outputting a control signal for shutting off the ground and overcurrent and for generating an alarm signal at the same time do.

Particularly, when the hybrid transformer 100 restores the image formation at the time of image formation of the power line, the power of the phase restored to the image-forming primary side of the power supply device flows to the image-forming position and also the image- It is necessary to use the switches M4, M5 and M6 on the power line power supply side of each of R, S and T to cut off the formed line of the primary power supply line in the phase in which the phase is generated. When the phase detector 210 detects each phase angle or each phase voltage and detects the phase of the image, if the image formed with the image-forming information is transmitted to the controller 250, The control signal output unit 260 compares the phase value of the phase detected by the phase detector 210 with the phase value of the phase value detected by the phase detector 210, (260) provides a control signal to the switch (M1) for power quality recovery and simultaneously provides a control signal to the switches (M4, M5, M6) for shutting down the power of the phase in phase, It is prevented from being supplied to the load.

In addition, the controller 250 compares the imaging detection value detected by the phase detector 210 with the imaging reference setting value, and determines that the power imaging operation is performed when the detected imaging detection value exceeds the reference setting value, Phase detection value detected by the detector 210 and an inverse phase reference set value to determine a reverse phase of the power when the detected inverse phase detected value is different from the normal phase reference set value, ), And when the detected voltage value exceeds the reference voltage value, it is determined that the voltage value is a neutral line image, and the current value detected by the current detector 230 is compared with a reference voltage value If the detected current value exceeds the reference setting value, it is determined that the power unbalance or the image harmonics increase or over current or ground fault , It is above or generates a signal for cutting off the power to pass to the control signal output unit 260, the over power quality recovery.

The controller may be implemented as a microcomputer, a microprocessor, a central processing unit, a microcontroller, or the like capable of storing controllable programs and controlling the overall operation of the power quality recovery relay 200 according to the stored programs.

The power quality recovery relay according to the present invention,

The power supplied from the KEPCO is supplied from the power supply through the transformer primary, and the 3-phase 4-wire or 3-phase 3-wire power is supplied through the secondary of the transformer. When the power line is reversed, When power line is broken due to failure of power supply device, abnormal voltage is generated due to power unbalance when power supply is broken due to operation, abnormal current is generated due to power unbalance, and image harmonics is applied to neutral line supplied to load side by non- The electric power supplied to the load is abnormally generated, and there is a fear of overheating and burning of the transformer, burning of the load side equipment, power loss, electric fire, and the like.

In particular, if an image of a power line occurs, electricity is paralyzed like an artery in the information age due to power unbalance, load is burned out due to operation of the phase-change relay, and if a reverse phase occurs in a power source, If the neutral wire is disconnected, abnormal voltage will be generated due to voltage unbalance, and due to the unbalance of the load, the load device will be overheated or burned due to the overvoltage on the light load side, In case of current imbalance, the efficiency of electric power such as power factor decrease, voltage drop, power loss increase, cable with low impedance, over current generation, Overheating of the neutral conductor, performance deterioration of the power transformer, voltage distortion, (Noise, power imbalance, image harmonics, overcurrent, ground fault, reverse phase) are changed, the load equipment to be supplied may be burned or electric Lt; / RTI >

In order to prevent such an accident in advance, in the present invention, the power quality restoration relay 200 may be configured such that the power line image formation and the reverse phase are generated at all times, the neutral line abnormality, the voltage unbalance occurs, the current unbalance occurs, the excessive image harmonics (Voltage, current) unbalance, excessive image harmonics flow in the neutral line, or a change in the power quality is detected by sensing the change in the power quality of the overcurrent, ground fault, , It outputs the power quality recovery control signal so as to maintain the stable power quality at all times by performing the alarm immediately and recovering the image or reverse phase, restoring the broken neutral line to the other neutral line, restoring the power unbalance, And a control signal that cuts off power when an over current or a ground fault occurs And power. In particular, if an abnormality is detected even after the power quality is restored, a control signal for shutting off the power is outputted, and when there is a change in the power quality, an alarm signal for notifying the manager is generated, Action is taken to avoid damage.

More specifically, when power is supplied from the power supply 300, the phase detector 210 operates to detect an image and an opposite phase of the power lines R, S, and T, And transmits the detected value of the reverse phase to the controller 250. [ In this case, the method of detecting the phase and the reverse phase can be detected by comparing each phase voltage (KEPCO supply regulation 380V ± 38V) or by determining the phase angle. In particular, the reverse phase is R, S, T or S, T, R or T , R, and S are determined as normal phases, and the order of the phases other than the phase sequence is determined as a reverse phase. Since the prior art for determining the image phase and the inverse phase is a well-known technique, a detailed description thereof will be omitted. The controller 250 receives the imaging detection value transmitted from the phase detector 210. The controller 250 compares the imaging detection value with the reference setting value to determine whether the imaging operation has been performed. And provides information to the control signal output unit 260. The control signal output unit 260 outputs the control information to the control signal output unit 260. [ The control signal output unit 260 outputs a control signal for intercepting the image-forming power among the switches M4, M5, and M6 connected to the power source of the phase-shifted phase in the power line based on the image forming information provided by the controller 250 At the same time, when the hybrid transformer 100 operates to output a control signal for connecting the switch M1 for image recovery, the electric power of the phase of three phases is supplied to the load, and the alarm generator 500 is operated Thereby informing the outside of the abnormality of the power quality.

In addition, the controller 250 receiving the reverse phase detection value detected by the phase detector 210 compares the reverse phase detection value with the reference set value and makes a determination. If it is determined that the reverse phase is a reverse phase, 280, and at the same time, provides reverse-phase abnormality information to the control signal output unit 260. The control signal output unit 260 blocks the second switch M2 provided to the power quality restorer 150 based on the phase information provided by the controller 250 and simultaneously supplies the power quality recoverer 150 with the power The third switch M3, and the alarm generator 500 to inform the outside that there is an abnormality in the power quality.

In addition, the voltage detector 220 operates to detect the abnormality of the neutral line N, and transmits the detected abnormality detection value to the controller 250. For example, the voltage detector 220 measures the voltage of the neutral line and ground (ground), and measures the voltage of the neutral line and the ground to check whether a voltage is generated in the neutral line and the ground. Here, the method of measuring the voltage of the neutral line and the ground is implemented in the same manner as the method of measuring using the voltage measuring device for measuring the voltage at both ends, so that detailed description is omitted.

In another embodiment, when the voltage detector 220 measures the neutral line and the voltage of each phase, if the unbalanced voltage is detected to be 220 V 13 V or more, which is the range of the normal voltage of the KEPCO supply regulation, it can be determined as a neutral line disconnection. In the voltage detector 220, only the neutral line and the voltage for each phase are measured and transmitted to the controller 250, and it is also possible that the controller 250 compares the voltage with each other and determines whether the neutral line is disconnected.

The current detector 230 compares the current values detected by the plurality of current converters R, S, T, and N to detect the current unbalance by phase, and detects an increase or an occurrence of the image harmonics of the neutral line in a current flowing through the power line and the neutral line (R, S, T, N) to detect the increase or occurrence of the image harmonics, detect the overcurrent by detecting the current of each power line, and compare the current values detected by the plurality of converters If only one current flows or if the current flowing in the power line and the neutral line is more abnormal than the reference value, it is detected as a ground fault. The method of detecting the image harmonics, the overcurrent, and the ground fault is well known in the art, so a detailed description thereof will be omitted.

If the imaging or reversed phase is detected by the phase detector 210, the controller 260 provides the controller 250 with the information on the imaging power lines R, S, T and the imaging abnormality information, (Neutral line disconnection) when voltage unbalance is confirmed by the voltage detector 220, and the neutral line disconnection abnormality information is included in the neutral line disconnection detection value. And supplies the current imbalance or the increase of the image harmonics or the overcurrent or the ground fault information to the controller 250 if it is confirmed by the current detector 230 that the current imbalance or the image harmonics increase or over current or ground fault To the controller (250). The controller 250 compares the power quality provided by each of the detectors 210, 220 and 230 with a preset reference value set in the controller 250. When the controller 250 determines that the power quality is abnormal, Stores the quality abnormality detection information in the memory 280 and provides information for restoring power quality and information for interrupting power to the control signal output unit 260. [ The control signal output unit 260 outputs a control signal for restoring the power quality or cutting off the power based on the power quality abnormality information provided by the controller 250 and at the same time operates the alarm generator 500 to generate an abnormal To the outside. Here, the power quality abnormality information may be a high signal (5V), and if the power quality abnormality is not detected, the power quality abnormality detection value may be a low signal (0V).

The controller 270 analyzes each of the power detection values provided from the detectors 210, 220 and 230 as a control program built in the controller 250. If it is determined that the detected power is not equal to or higher than the power quality, The control signal output unit 260 does not output a control signal for operating the power quality restorer 150. Otherwise, when it is determined that the power quality is abnormal, the control signal output unit 260 outputs a control signal for operating the power quality restorer 150, , M3 OFF) control signal and an alarm signal at the same time.

4, when the recovery information for power quality recovery is transmitted from the controller 250, the control signal output unit 260 outputs a control signal for restoring power quality The power quality restorer 150 is connected to each of the switches M1, M2, M3, M4, M5 and M6 by turning on or off the switches M1, M2, When the abnormal power generated by the quality recovery unit 150 is recovered to the normal power having the normal power quality, it is possible to prevent various electric accidents caused by power line image formation and reverse phase, It is possible to maintain the unbalance of single phase voltage as before and to prevent the electric accident and electric power waste caused by power unbalance and image harmonics and to prevent the occurrence of over current and ground, Even if a problem of power quality occurs, overvoltage and overcurrent are prevented from flowing to the load side as in the prior art, and the normal voltage is maintained or the problematic power is shut off. As a result, And problems such as waste of power due to image harmonics and power quality, burnout of power distribution facilities, and fire are prevented.

Next, the current detector 230 for monitoring the current imbalance detects the current flowing through each of the phases R, S, T, and N to transmit the current detection value to the controller 250. It is preferable to use a general CT for the current detection method.

The controller 250 compares the current detection value detected by the current detector 230 with the reference set value preset in advance to determine the current unbalance (within 30% of the load rate, for example, R phase = 40 KVA, S phase = 30 kVA, and T phase = 20 kVA). If the current detection value is less than or equal to the reference set value, the current balance is determined to be the current balance and the current detection value is larger than the reference setting value The current imbalance detection information is stored in the memory 280 and information for restoring the current imbalance is included and provided to the control signal output unit 260. [ The control signal output unit 260 outputs a control signal for power quality recovery based on the recovery information provided by the controller 250 so that the hybrid transformer 100 outputs a recovery control signal for canceling the current imbalance to the switch M1. At the same time, the alarm generator 500 is operated to notify the outside that the power quality is abnormal.

Meanwhile, as shown in FIG. 4, the hybrid transformer 100 receives the recovery information for restoring the power quality of the image quality, the power unbalance, and the image harmonics increase to the normal power from the controller 250 The control signal output unit 260 outputs a control signal for restoring power quality so that the switch M1 operates in an ON state and connects the hybrid transformer 100 to each phase. The unbalanced overcurrent and the unbalanced overvoltage that may occur due to the power quality abnormality are generated, the electric equipment is burned down, the power factor is lowered, the voltage drop and the power loss are increased, and the power The quality of the power supply 300 can be maintained at a power balance state as before, As a waste of electric power to the power decrease in the quality and is prevented from being damaged, and the transformer, so to give to maintain normal jeonryeokreul avoid problems waste power as existing and that the damage to electrical equipment.

Next, the current detector 230 detects the currents flowing through the respective phases R, S, T, and N and the neutral line, and transmits the current detection values to the controller 250. It is preferable to use a general CT for the current detection method.

The controller 250 calculates the image harmonic generation amount using the reference value (the reference value of the neutral line or the reference value Ri + Si + Ti = Ni of the image harmonic generation amount) in order to discriminate the detected current detection value and the image harmonic amount. If the current detection value is less than the reference setting value, it is determined that the image harmonic is not excessive and the previous state is maintained. Otherwise, if the current detection value is larger than the reference setting value, The image harmonics increase detection information is stored in the memory 280 and the image harmonics increase recovery information is supplied to the control signal output unit 260. The control signal output unit 260 outputs a control signal for restoring the power quality based on the recovery information provided by the controller and switches the control signal for reducing the image harmonics to the switch M1 connected to the hybrid transformer 100 M1, and at the same time operates the alarm generator 500 to inform the outside that there is an abnormality in the power quality.

4, when the control signal for reducing image harmonics is transmitted from the controller 250, the hybrid transformer 100 operates while the switch M1 is on, The hybrid transformer 100 is connected to each of the phases R, S, and T provided in the hybrid transformer 100, and the image harmonics flowing through the neutral line are reduced by the hybrid transformer 100. Here, the operation of the hybrid transformer 100 is described in detail in the prior art document described in the background art of the invention, and it is obvious that any person skilled in the art can understand the operation of the hybrid transformer 100. Therefore, The description is omitted.

The controller 250 then continuously compares the current detection value detected by the current detector 230 with the reference setting value, and if the current detection value is smaller than the reference setting value It is determined that the image harmonics flowing through the neutral line is reduced and the switch M1 provided in the power quality restorer 150 is turned off to release the hybrid transformer 100. [

In addition, the present invention outputs a control signal for outputting an alarm control signal and simultaneously operating the power quality restorer 150 when power line imaging phase, reverse phase phase, neutral phase phase phase, load power unbalance occurs, A power cutoff control signal is generated when the post-power quality is not normal power, a power cutoff is output by outputting a control signal for cutting off the power in case of overcurrent and ground fault, and at the same time, It is possible to confirm the abnormality of the power quality by the display 240 which can visually confirm abnormality information which is stored in the memory 240 and to repair it based on the power quality abnormality information displayed on the display 240. [ Since the display 240 is a conventional digital instrument, detailed description thereof will be omitted. When an overcurrent and a ground fault occur, the control signal is automatically outputted to the load, and when the alarm is not released within a predetermined time after the power is restored normally, Thereby preventing an electrical accident that may occur due to the power line image formation, the reverse phase, the neutral line abnormality, the unbalanced load power, the image harmonics increase, the overcurrent, and the ground fault.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

100 - Hybrid Trans
150 - Power quality restorer
200 - Power Quality Recovery Relay
210 - phase detector
220 - Voltage Detector
230 - Current detector
240 - Display
250 - controller
260 - Control signal output section
270 -
280 - Memory
300 - Power supply
400 - Load
500 - Alarm generator

Claims (6)

In a relay that prevents energy loss and electric disaster caused by power line image formation, reverse phase or neutral line image formation, increase of image harmonics, overcurrent, overvoltage, ground fault in a power distribution system,
In order to recover the phase of the power line and the phase of the reverse phase of the power line provided to the power supply apparatus and to recover the phase of the phase line and the phase of the reverse phase of the power line, And transmits a power cutoff control signal to the switch or the breaker connected to the load when the generation of the opposite phase to the image formation is detected even after the reset control signal is outputted to the switch And a control unit. The apparatus of claim 1,
A phase detector for detecting whether or not an image is formed on the power line;
A voltage detector for detecting the phase of the neutral line and whether the voltage is unbalanced;
A current detector for detecting a current value flowing through the power line and the neutral line;
And a phase detector for detecting the phase of the neutral line when the voltage unbalance is detected by the voltage detection value outputted by the voltage detector, The unbalanced overcurrent abnormality state of the differential load, the occurrence of the image harmonics, and the overcurrent and the ground fault are compared with the reference set values which have been set in advance, so that the phases, reverse phase, power unbalance and image harmonics increase, A controller for determining an overcurrent and a ground fault;
A control signal for recovering the power quality by receiving the recovery information provided by the controller when the power line image formation, the reverse phase or the neutral line image formation or the power unbalance or the image harmonics generation or the unbalanced overcurrent generation, And a control signal output unit for simultaneously generating a control signal for generating an alarm and generating a control signal for shutting off the power in the event of a power quality abnormality even after recovering the power quality. 3. The apparatus of claim 2, wherein the control signal generator comprises:
The current detector of the controller detects and outputs an output detection value detected by the plurality of current converters and compares the output detection value with the reference set value to determine whether an over current or a ground fault has occurred, And generates a control signal for power cutoff. 3. The apparatus of claim 2, wherein the control signal generator comprises:
Wherein the power quality restoration and the power cutoff signal received from the controller are adjusted using a timer to generate a control signal. 3. The apparatus of claim 2, wherein the control signal generator comprises:
When the power line image forming signal is transmitted to the controller, the image forming apparatus cuts off the primary power of the power source on the power source side so that the phase of the power recovered by the power quality restorer passes through the primary of the power line And does not supply power to an imaging phase of a load other than a load to be restored. 2. The system of claim 1, wherein the power quality recovery relay comprises:
And a device for displaying the detected values detected and output by the detectors so that the detected values can be visually confirmed.
KR1020130037969A 2013-04-08 2013-04-08 Power quality recovery relay KR20140121593A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130037969A KR20140121593A (en) 2013-04-08 2013-04-08 Power quality recovery relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130037969A KR20140121593A (en) 2013-04-08 2013-04-08 Power quality recovery relay

Publications (1)

Publication Number Publication Date
KR20140121593A true KR20140121593A (en) 2014-10-16

Family

ID=51993039

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020130037969A KR20140121593A (en) 2013-04-08 2013-04-08 Power quality recovery relay

Country Status (1)

Country Link
KR (1) KR20140121593A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160109269A (en) * 2015-03-10 2016-09-21 엘에스산전 주식회사 Digital relay
KR20190008733A (en) * 2017-07-17 2019-01-25 연암공과대학교산학협력단 Method of reclosing distribution system
KR20190034879A (en) * 2017-09-25 2019-04-03 동인시스템 주식회사 Protective Apparatus and Method for Power System
KR20190034895A (en) * 2017-09-25 2019-04-03 동인시스템 주식회사 Protective Apparatus and Method for Zero Harmonic Filter
EP3432433A4 (en) * 2016-03-15 2019-11-20 Fujitsu General Limited Power coversion device and power supply system
KR102063287B1 (en) * 2019-07-29 2020-01-08 제일전기공업 주식회사 Circuit Breaker Based on Phase Measurement and Arc Detection of Power Level and Method thereof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160109269A (en) * 2015-03-10 2016-09-21 엘에스산전 주식회사 Digital relay
EP3432433A4 (en) * 2016-03-15 2019-11-20 Fujitsu General Limited Power coversion device and power supply system
KR20190008733A (en) * 2017-07-17 2019-01-25 연암공과대학교산학협력단 Method of reclosing distribution system
KR20190034879A (en) * 2017-09-25 2019-04-03 동인시스템 주식회사 Protective Apparatus and Method for Power System
KR20190034895A (en) * 2017-09-25 2019-04-03 동인시스템 주식회사 Protective Apparatus and Method for Zero Harmonic Filter
KR102063287B1 (en) * 2019-07-29 2020-01-08 제일전기공업 주식회사 Circuit Breaker Based on Phase Measurement and Arc Detection of Power Level and Method thereof
US11283256B2 (en) 2019-07-29 2022-03-22 Cheil Electric Wiring Devices Co., Ltd. Power interruption method and device based on phase measurement and arc detection of power level

Similar Documents

Publication Publication Date Title
CN112262511B (en) Universal power distribution system for detecting and repairing electrical faults and construction method thereof
KR101803431B1 (en) Real-time recovery transformer system and its method of construction in case of single-phase power line failure
KR20140121593A (en) Power quality recovery relay
KR101365398B1 (en) Earthquake disaster prevention system built-in switchgear and control method thereof
KR101052471B1 (en) Neutral wire replacement device in power system and method
WO2011148749A1 (en) Electrical leakage detection apparatus with unexpected motion blocking function
KR101320373B1 (en) Open-phase recovery device equipped with a transformer and its installation method
KR102277716B1 (en) Real-time detection and recovery system and its construction method in case of power line failure in distribution system
KR20190067564A (en) Real-time detection and recovery system and its construction method in case of power line failure in distribution system
KR101193145B1 (en) Cabinet panel for prevention disaster of neutral line peculiar and control method thereof
JP2020515228A (en) Real-time detection / recovery system in case of power line failure and its construction method
KR20150013105A (en) device of recovery for open-phase in the power system line
KR101417940B1 (en) Cabinet panel for prevention disaster of abnormal voltage protection and method thereof
JP6509029B2 (en) Distribution board
KR101049862B1 (en) Distrtibuting board cabinet panel with neutral line replacement
KR101227537B1 (en) Cabinet panel of built-in neutral line repair function
KR20150134563A (en) Power system in the event of power failure recovery device
KR101208467B1 (en) Cabinet panel for prevention disaster of neutral line peculiar and control method thereof
KR101208468B1 (en) Device for prevention disaster in cabinet panel
JP2008220136A (en) Protection relay system of distribution system
KR20190049662A (en) Electric fault master recovery device(breaker)
KR101365290B1 (en) Eco-friendly energy-saving power quality recovery equipment equipped switchboards
JP5858236B2 (en) Battery system
KR20140121586A (en) Switchboard to recover the reversed- phase and power quality
KR20170042070A (en) Apparatus and method for preventing disaster caused by short-circuit in electric power systems

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application
AMND Amendment
E902 Notification of reason for refusal