KR101365290B1 - Eco-friendly energy-saving power quality recovery equipment equipped switchboards - Google Patents

Abstract

The present invention relates to eco-friendly energy-saving power quality recovery apparatus having switchboards. According to one embodiment of the present invention, the eco-friendly energy-saving power quality recovery equipment having switchboards includes a transformer, a hybrid trans, and a power quality recovery apparatus. [Reference numerals] (180) Liquid detecting unit; (200) Breaker control signal; (210) Break detecting unit; (220) Current detecting unit; (230) Temperature detecting unit; (240) Power quality restore unit; (250) Controller; (270) Alarm reset signal input unit; (280) Alarm generator; (AA) Detect a temperature; (BB) R, S, T, N phases, voltage; (CC) R, S, T, N current transformer(CT)

Description

Distribution board with eco-friendly energy-saving power quality recovery equipment {Eco-friendly energy-saving power quality recovery equipment equipped switchboards}

The present invention relates to a distribution panel equipped with an eco-friendly power-saving power quality recovery device, and more particularly, in the three-phase four-wire or three-phase three-wire distribution system (switch distribution panel) and the reverse and neutral line disconnection or power line of the power line; When an abnormal current occurs in the neutral line, the reversed phase is restored to the normal phase, prevents unbalanced overcurrent and unbalanced overvoltage caused by disconnection of the neutral line, maintains the steady voltage, and maintains the power unbalance in equilibrium. The present invention relates to a distribution board equipped with an eco-friendly power saving type power quality recovery device that prevents wasting of power due to power quality degradation by enabling attenuation of image harmonics.

Generally, in the power system, the 22.9 kv-y power distribution system supplies power directly from a substation to a large-scale customer such as a factory or a building through a 3-phase 4-wire distribution line, or through a secondary transformer to a small- To the power supply.

Such distribution lines are constructed in the form of machined lines in the outskirts of cities and farming and fishing villages, but they are buried underground in areas where beauty is important, such as large cities and amusement parks.

The three-phase four-wire distribution system combines the neutral line (N) with the power line (R phase, S phase, T phase) by means of Y connection, delta connection and Wiedelta connection. In this connection, when one power line and another power line are connected, 380V is formed. When one power line (for example, A phase) and a neutral line (N) are connected, 220V is provided to supply power to the load.

Here, the neutral line (N) means a line in which one line of each phase is common in the multiphase multi-line line. In principle, 6 wires are required to use 3 phase. However, when the phases of the single-phase, two-wire lines are changed by 120 degrees and all the lines are made common, the number of lines is reduced to four, and the potential at one point is commonly zero by the vector sum. This zero potential (zero potential) becomes the reference potential and becomes the so-called N phase, that is, the neutral line.

In this condition, the neutral line should have a zero potential, which is the ground potential in principle, but it may have a slight voltage when the phase of each phase is not exactly 120 ° in the field. At this time, if the neutral line is commonly connected to the ground line, which is the earth potential line, in order to prevent the rise of the neutral potential, the zero potential is maintained because the phase is in contact with the earth even though the phases are slightly different from each other.

In Korea's power distribution system adopting 3-phase 4-wire system, unbalanced current flows through neutral and power lines because single-phase load and 3-phase load are mixed. When unbalanced current flows, efficiency of transformer is lowered, It causes burnout. In recent years, more image harmonics have flown in the neutral line due to the increase in nonlinear load devices such as computers, LED lighting devices, office equipment such as copiers, and uninterruptible power supplies (UPS).

Harmonics is a frequency corresponding to an integer multiple of 2, 3, or 4 times the fundamental frequency, and is referred to as a distortion or a distorted wave. In particular, harmonics such as 3, 6, 9, The high frequency component corresponding to a multiple of 3 is referred to as image harmonic.

As image phase harmonics have the same phase of each of the three phases, three single phase power sources are connected in parallel, so that the image harmonics up to 3 times are superimposed on the neutral line. When excessive image harmonics flow in the neutral line, the bushing portion is disconnected due to overheating of the neutral conductor, excessive current flows in the neutral line, or the neutral line and the power line.

If the neutral wire is disconnected, the load-side earth leakage breaker having a large impedance is broken, and an accident that the load of the elevator and the phoenix device connected to the voltage line is burned is generated. Also, excessive current flow to the neutral and power lines wastes power and causes the transformer and neutral wire to be destroyed.

If this is explained in more detail as follows.

Figure 1 shows the voltage and current flow across a normal circuit in a three-phase four-wire power system (when the load imbalance is 3: 1).

The voltage in the normal circuit is supplied to the A-phase and the N-line 220V, the B-phase and the N-line to 220V, and the current flows from the A-phase to the N-phase and the B-phase to the N-phase.

However, if the neutral line (N) is disconnected, 220V will disappear and only 380V will be present. In other words, the neutral line does not flow, and the load flows in series from A to B phase.

That is, as in the circuit diagram shown in Fig. 2, the impedance between each phase and the neutral line becomes equal to 380 V connected in series with the impedance inversely proportional to the load on the A phase and the load on the B phase, .

In this case, even when the load is balanced, the voltage is changed. In the state where the neutral line is connected, the voltage between the neutral line and the voltage line (power line) is 220V. However, if the neutral line is disconnected, the voltage unbalance occurs. Unbalance is getting worse because of disconnection, burnout, etc., and almost all of the light load side equipment is damaged.

In conclusion, when the neutral wire is disconnected in the three-phase four-wire distribution system, the voltage at the light load terminal rises, the load at the heavy load decreases, The circuit is opened by turning off the switch or the breakdown, and the voltage imbalance is gradually intensified so that almost all of the down-section electric apparatuses are damaged.

On the other hand, in the single-phase three-wire distribution system, when the neutral line is disconnected, an overvoltage flows and the load-side electric device is damaged. In addition, if power unbalance and image harmonics are generated due to the supply of the load, electric power is wasted, and electrical accidents of devices of the power distribution system are overheated or burned.

In order to solve all of the problems caused by such neutral line disconnection, a conventionally proposed technique is disclosed in Korean Patent Registration No. 10-1052471 (registered on July 22, 2011) (entitled " (Hereinafter abbreviated as " Prior Art 2 ") and Korean Patent Registration No. 10-0883771 (the name of the invention: Electronic Relay for Reversed Phase and Phase Image Protection) .

In the disclosed prior art 1, when an excessive current flows in a neutral line or a neutral line, a three-phase (R, S, T) power source is connected to an internal neutral line protector and a common line is formed to replace the neutral line Thereby preventing generation of an abnormal voltage.

Also, the disclosed Prior Art 2 relates to a relay, which detects whether a power source supplied to a three-phase load device is reversed or not, so that the supplied power can be cut off, and the internal electronic device can be safely protected 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.

Registered patent 10-1052471 (Registered on Feb. 21, 2000) (Name of invention: Neutral line replacement device in power system and method thereof) Korea Patent Office Registration No. 10-0883771 entitled "Electronic Relay for Reversed Phase and Phase Image Protection"

However, in the above-described conventional technique, it is not possible to prevent the generation of a power failure by operating the relay to generate the reverse-phase power in the three-phase three-wire or three-phase four-wire power system, However, there is a problem that power imbalance and image harmonics, which cause the neutral line failure, can not be solved.

Therefore, the unbalance of the power and the harmonics deteriorate the efficiency of the neutral line replacement device, waste unnecessary electric power, burn out the neutral line replacement device, cause burning of the load device, fire, electric accident.

Accordingly, the present invention has been made to solve the above problems occurring in the conventional neutral line replacement apparatus,

The problem to be solved by the present invention is to restore the normal phase in the reverse phase of the power line in the three-phase three-wire or three-phase four-wire distribution system, to prevent the occurrence of overvoltage during the disconnection of the neutral line (neutral line), and to maintain a steady voltage In addition, the present invention provides a distribution board equipped with an eco-friendly power-saving power quality recovery device that maintains power unbalance in each phase and maintains the power balance and reduces image harmonics flowing in the neutral line.

Another object of the present invention is to provide a distribution board equipped with an eco-friendly power-saving power quality recovery device that can reduce the neutral wire replacement device due to power unbalance or to reduce unnecessary waste of power.

Another object of the present invention is to provide an eco-friendly power-saving power quality recovery device that can reduce harmonics, which is the cause of neutral wire failure, to prevent burnout of the neutral wire replacement device, and restore electric power quality to save electric energy. To provide overall distribution.

Another problem to be solved by the present invention is to provide a distribution board equipped with an eco-friendly power-saving power quality recovery device that warns when a neutral wire disconnection or a neutral current is detected, so that subsequent actions can be made.

Another problem to be solved by the present invention is that when the reverse current of the power line and the neutral wire or neutral wire is generated and the power quality restorer is operated and the reverse phase or voltage unbalance and the abnormal current of the power line are detected, the breaker or switch is automatically turned on. The present invention provides a distribution board equipped with an eco-friendly power saving type power quality recovery device for preventing the load device from being burned out by overvoltage and overcurrent due to burnout of the mechanical device due to reversed phase and abnormal neutral wire.

Distribution board equipped with an eco-friendly power-saving power quality recovery apparatus according to the present invention for solving the above problems,

It is connected to the power supply device equipped with a transformer and a circuit breaker for supplying power through three-phase three-wire (R, S, T) or three-phase four-wire (R, S, T, N), and is provided in the power supply device. Detects the abnormal state of the power line and the neutral line, and if an abnormality is detected in the reverse phase of the power line and the power line and the neutral line, connect a switch, restore the reverse phase to the normal phase through the connected switch, and recover the neutral line abnormality It is characterized in that it comprises a power quality recovery device that is connected to the power line to prevent the generation of unbalanced voltage and unbalanced current through the power quality restorer, and to maintain the normal power by reducing the generated image harmonics.

The power quality recovery apparatus includes:

A reverse phase detector for detecting whether or not the power line is inverted;

A solid line detector for detecting whether the neutral line is disconnected;

A current detector for detecting an abnormal current flowing through the power line and the neutral line;

A temperature detector for detecting the temperature of the neutral line;

An abnormal current value output by the current detector, and a temperature detection value output by the temperature detector; and a determination unit that determines whether or not the power quality A controller for generating a control signal for recovering a reverse phase and an abnormal power of the power line and the neutral line when a reverse phase of the power line and a disconnection of the neutral line or an abnormal current flows through the power line and the neutral line;

And a controller for restoring a reverse phase of the power line and the abnormal power of the power line and the neutral line according to a control signal generated by the controller to restore the phase phase power to a normal phase and outputting the neutral phase line, And a power quality restorer that cuts off the power when the power abnormality is detected even when the abnormal power is recovered due to the unbalance power (voltage, current) and reduces the image harmonics generated.

Wherein the disconnection detector comprises:

Phase voltage of the neutral line and the three-phase voltage is detected, and when the unbalanced voltage is detected in the single-phase voltage of the neutral line and the three-phase voltage, the neutral line disconnection detection value is output to the controller.

Wherein the current detector comprises:

When the amount of current flowing through the neutral line is measured and a current larger than a set reference value is detected, the overcurrent detection value is output to the controller.

The temperature detector comprises:

When the temperature of the neutral line is measured in real time and a temperature exceeding the set reference value is detected, the abnormal temperature detection value is outputted to the controller.

The power quality restorer includes:

A hybrid transformer, a first switch, a second switch, and a third switch for reducing the image harmonics by maintaining the phase unbalance and the current unbalance for each phase as phase equilibrium by converting the phase of the reverse phase of the power line into a normal phase, .

According to the present invention, when a reverse phase of a power line occurs in a three-phase three-wire or three-phase four-wire distribution system, a neutral line disconnection occurs, or an abnormal current flows between the power line and the neutral line, the power line By converting the reversed phase of the phase into a normal phase and quickly recovering the neutral disconnection and abnormal currents of the power line and the neutral line, it prevents the occurrence of overvoltage, maintains the power unbalance at the power balance, and removes the image harmonics. Therefore, there is an advantage that can continuously flow the normal power to the load side.

In addition, according to the present invention, it is possible to prevent the load device from being damaged due to the reverse phase and the overvoltage, to prevent the loss of wasted power due to the degradation of the transformer due to the power unbalance and the degradation of the power quality caused by the image harmonic generation There are advantages to be able to.

FIG. 1 is a voltage and current flow diagram for a conventional three-phase four-wire power system.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a three-phase four-wire power system.
3 is a circuit diagram of a distribution board having an eco-friendly power saving power quality recovery apparatus according to a preferred embodiment of the present invention.
4 is a circuit diagram and a vector diagram of a hybrid transformer.
5 is a circuit diagram of one embodiment of a power quality recoverer.
6 is a flow chart in which image harmonics are reduced while passing each leg with inductance of the normal phase of each of the other three phases in the order in which the windings are wound.
Fig. 7 is a flow chart in which image harmonics are reduced by passing two windings opposite each leg in each of the other three-phase windings in the order in which each winding is wound according to the invention.

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.

3 is a circuit diagram of a distribution board including an eco-friendly power saving type power quality recovery apparatus according to a preferred embodiment of the present invention, and includes a power quality recovery apparatus 200 associated with the power supply device 100.

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

The power supply unit 100 is a general power supply unit that supplies power supplied from KEPCO to a three-phase four-wire system (R, S, T, N) or a three-phase three-wire system (R, S, T).

The power quality recovery apparatus 200 is connected to a power supply apparatus 100 that supplies power through a three-phase four-wire system (R, S, T, N) or a three-phase three wire system (R, S, T) Detects an abnormal state of the power line and the neutral line (N) provided in the power supply device (100), and when a reverse phase of the power line is detected, it cuts off the generated power and supplies power converted into the normal phase, When the abnormality is detected, the inductance of each phase is connected, the power unbalance is restored to the power balance through the connected induction, and the neutral line is restored by connecting to the recovery neutral line to prevent the occurrence of the overvoltage and the overcurrent, And maintains the normal voltage.

The power quality recovery apparatus 200 includes a reverse phase detector 190 for detecting whether the power line is reversed; A solid line detector 210 for detecting whether the neutral line N is disconnected; A current detector (220) for detecting an abnormal current flowing through the power line and the neutral line; A temperature detector 230 for detecting the temperature of the neutral line; The abnormal current detection value outputted by the current detector 220 and the abnormal current detection value outputted from the temperature detector 230 are compared with the detected value of the reverse phase outputted from the reverse phase detector, the disconnection detection value outputted by the disconnection detector 210, Determining whether the power line and the neutral line are disconnected from each other by a reverse phase and a neutral line of the power line or an abnormal current of the neutral line, A controller 250 for generating a control signal for restoring power quality such as image harmonics reduction; The control unit 250 regenerates the phase reversal to the normal phase by the power lines R, S and T provided in the power supply 100 and controls the unbalanced power of the power line and the neutral line N And a power quality restorer 240 for maintaining the balance of currents for each phase voltage and for reducing the image harmonics.

The controller 250 may be a microcomputer, a microprocessor, a central processing unit, a microcontroller, or the like capable of storing a controllable program and controlling the overall operation of the power quality recovery apparatus 200 according to the stored program desirable.

5, the power quality restorer 240 includes switches M1, M2, and M3 on a power line for recovering power quality, and when the reverse phase occurs, the connected power of the switch M2 (M1) for connecting the inductance when the power quality of the power line and the neutral line is higher than the power quality of the power line, and a switch It is desirable to include a hybrid transformer 150 that maintains equilibrium and reduces harmonics.

The power quality recovery apparatus 200 further includes an alarm generator 260 for generating an alarm when a reverse current or a neutral line of the power line or an abnormal current flows through the neutral line and the power line according to the alarm generation control signal output from the controller 250, .

In addition, the power quality recovery apparatus 200 generates an alarm release signal when the alarm release switch for alarm release is operated by the manager after the alarm is generated by the alarm generator 260, and transmits the alarm release signal to the controller 250 And an alarm release signal input unit 270 for outputting an alarm signal. The alarm release signal input unit 270 includes an alarm release switch as is well known in the art.

In the overall distribution system having the environment-friendly power saving type power quality restoration apparatus according to the present invention configured as described above, after the power supplied from the KEPCO is supplied through the primary transformer, the power supply apparatus 100 is connected to the distribution board and the switchboard .

In this case, if a reverse phase is generated on the power line, the mechanical device due to the reverse phase is burned out, or the electric current is interrupted due to the operation of the counter-phase relay provided in the past and the electric power of the artery of the information age is paralyzed, resulting in great inconvenience and loss. The voltage to be supplied differs depending on the capacity of the load. This causes an accident that a fire or a load device is burned due to an abnormal voltage (overvoltage) at the lower side of the light load. When power unbalance and image harmonics occur, Excessive current flows, thereby wasting power, and the neutral line is overheated or broken.

In order to prevent such accidents in advance, in the present invention, the power quality recovery apparatus 200 detects the state of the normal power line and the neutral line, and when the reverse phase of the power line occurs, the switch provided in the power quality restorer 240 operates, Phase power is restored to the normal power by operating the power switch M3 for turning off the reverse phase to the normal phase by blocking the switch M2 connected at the time of normal operation and generating an alarm immediately, And an unbalance in the neutral line are detected, an alarm is immediately performed and the hybrid transformer 150 provided in the power quality restorer 240 is operated to compensate for the unbalanced power between phases, and an overvoltage flows under the light load The power imbalance is kept in equilibrium, and the harmonics generated in the neutral line are removed.

The reverse detector 190, the disconnection detector 210, the current detector 220, and the temperature detector 230 operate to control the operation of the power line 100. As a result, Detection of a current value detected by a reverse-phase detector 190 for detecting a reverse phase, detection of a disconnection detector 210 for detecting whether or not a neutral line N is disconnected, detection of a current detector 220 for detecting a neutral- Value and the detected value of the temperature detector 230 for detecting the temperature of the neutral line to the controller 250. [ For example, the reverse phase detector 190 detects the phase angles of the power lines R, S and T so that when the phase angle order is R, S, T or S, T, R or T, S, T, or S, T, R, or T, R, S, or other order. Another method is to detect the voltage and judge the normal phase when the order of the voltage (pulse) is R, S, T or S, T, R or T, R, do. Alternatively, the disconnection detector 210 measures the voltage and / or the ground voltage of the neutral line, and determines whether the voltage is detected on the neutral line Otherwise, it is determined whether the earth voltage is detected and the disconnection of the neutral line is judged. As another method, it is judged whether the neutral line is broken by judging whether the voltage is unbalanced or not. As another method, the voltage at the point A and the point B of the neutral line is measured, and the break of the neutral line is determined by detecting the voltage. As another method, whether or not a contact failure of the neutral wire terminal is detected through the contact failure detecting device is determined to determine the disconnection of the neutral wire. In another method, the disconnection of the neutral wire is determined by the operation of the phase protector using the existing phase protection device, and the current detector 220 determines the current setting value of the current flowing through the neutral wire. Another method is to compare the current ratios of the three phases (Ri + Si + Ti = Ni, Ri + Si + Ti + Ni = 0) and determine the overcurrent if an abnormal current occurs in the neutral and power lines. Alternatively, if the ratio of the current unbalance of each of the three phases is 30% or more (extended regulation), it is judged as overcurrent. The temperature detector 230 monitors the temperature of the neutral wire, and determines that the overcurrent flows when the temperature rises above the reference value.

If it is determined to be a reverse phase of the power line, the power line reverse-phase detector 190 provides the power line reverse-phase abnormality information to the controller 250. If the neutral line disconnection detector 210 determines that the neutral line is a disconnection, To the controller 250. The current detector 220 includes the abnormal current information and supplies it to the controller 250 when the excessive current flows to the neutral line or the increase of the image harmonics is detected and the temperature detector 260 ) Provides the abnormal current information to the controller 250 when the temperature exceeds the predetermined temperature reference value of the neutral line. Here, the abnormal information when the power line reverse phase, the neutral line disconnection, or the abnormal current flows can be referred to as a high signal (5V). In the case where no abnormal current is detected in the power line neutral line or the power line and neutral line, The overcurrent detection value of power line and neutral line can be called low signal (0V).

The controller 250 receives the inverse phase information provided from the inverse phase detector 190, the disconnection information provided from the disconnection detector 210, and the abnormal current detection value provided from the current detector 220 and the temperature detector 230 The power quality restorer 240 is not operated. On the other hand, when the power quality restorer 240 is operated, it is determined that there is no overcurrent in the power line reverse or neutral line, or excessive unbalance in the power line and the neutral line. If it is determined that the current flows, the power quality restorer 240 is operated. If an excessive unbalanced current flows through the power reversal or neutral line, or the power line and the neutral line, if the detected value is a high signal, it is judged to be an unbalanced overcurrent of the power line reverse line or the neutral line or the unbalanced over current of the power line and the neutral line. If the unbalanced overcurrent detection value is a low signal, it is judged that it is not an unbalanced overcurrent of a power line reverse phase or neutral line disconnection or a power line and a neutral line.

As shown in FIG. 4, the power quality restorer 240 includes an inductance (hybrid transformer) that can internally induce electromagnetic induction by using electromagnetic waves and power from different phases, When the operation control signal is transmitted, the switch M1 is operated to supply electric power to the hybrid transformer, and is connected to the neutral line N for recovery. That is, when the neutral line for recovery (N) is always present, or when an abnormal current flows in the neutral line and the power line, the neutral phase line is connected to the recovery neutral line through the hybrid transformer (150) The power quality restorer 240 is operated. Here, it is preferable to use a switch such as a magnet switch or an electronic switch (SSR) or ACB or ATS.

When the power quality restorer 240 operates to recover the reverse or neutral line of the power line or the abnormal current flow of the power line and the neutral line, the power may be paralyzed to the power line phase, or may be caused by the neutral line disconnection or the abnormal current of the power line and the neutral line It is possible to keep the unbalance of the electric power of each phase to be balanced as before and to reduce the image harmonics so that even when the neutral current of the power supply device 100 is broken or the abnormal current flows, It prevents the overvoltage from flowing, keeps the power unbalance in equilibrium state, reduces the image harmonics and keeps the steady voltage. Therefore, overvoltage or overcurrent flow like the conventional one, which prevents the electric appliance from burning down or wasting power. do.

In addition, it maintains current unbalance in current equilibrium and reduces harmonics of the image to prevent the neutral conductor overheating, middle wire failure, burnout of neutral wire substitution device, damage of power distribution equipment such as transformer, and saving wasted power by restoring power quality can do.

Meanwhile, the controller 250 drives the alarm generator 260 as soon as it is judged that a disconnection of a power line or a neutral line or an abnormal current of a power line and a neutral line flows. The alarm generator 260 is driven to alarm the neutral line disconnection or the neutral line. In the present invention, the alarm is generated using a visual alarm and / or audible alarm.

If the administrator recognizes this in the presence of visual and / or audible alarms, it will take immediate action to take immediate action, which may result in the disconnection of power lines or neutral lines, or the occurrence of various accidents .

In addition, the administrator can release the alarms as needed. For example, when the alarm release switch provided in the alarm release signal input unit 270 is operated, the alarm release signal input unit 270 generates an alarm release signal and transmits the alarm release signal to the controller 250.

When the controller 250 receives the alarm release signal, the controller 250 stops the operation of the alarm generator 260 and releases the alarm.

The present invention also provides a method of controlling a power line or phase line by automatically shutting off power supplied to a load when an alarm cancellation is not requested within a predetermined period of time after an alarm for an abnormal current of a power line or a neutral line, It can prevent accident that may occur due to disconnection of neutral wire or abnormal current of power line and neutral line.

In addition, as is well known in the art, the power quality restorer 240 is operated by a power line reverse or neutral line disconnection or an abnormal current of a power line and a neutral line, and a power line reverse or neutral line disconnection or an abnormal power detector of a power line and a neutral line 190, 210, 220, and 230, the abnormal power of the power line or the neutral line, or the abnormal power of the power line and the neutral line is continuously detected. ASS, ASS, VCB) by using a control signal in the controller 250 when a reverse phase is detected, power (voltage, current) unbalance is detected, , ACB, MCCB, ELB, etc.), or only the single-phase load power is cut off when the neutral wire is disconnected, or the main breaker and the single- Blocking at the same time to thereby prevent the damage of load device.

For example, according to the present invention, when an excessive current flows in a power line or a neutral line of a power supply device, or when an excessive current flows in a power line and a neutral line, automatic power quality automatic restoration is automatically performed so that an excessive unbalanced current flows in a power line reverse line or a neutral line, It prevents power imbalance caused by power quality and phase difference, reduces image harmonics, prevents burnout of electrical equipment under the neck due to disconnection of neutral line, suppresses current unbalance and harmonic generation which are the cause of neutral line failure Improve power quality, and prevent power waste. If an excessive unbalance current is generated in the power line reverse or neutral line, or the power line and the neutral line, an alarm is generated and the administrator can recognize the unbalance current. Then, the manager can take the follow-up action quickly so that the power line reverse or neutral line, The excessive unbalanced current flows to the neutral line, and it is possible to prevent accidents such as fire caused by overheating which may occur later, system failure due to overvoltage and reverse phase.

In addition, when the power quality recovery fails, the circuit breaker operation control signal is generated to operate the circuit breaker, thereby preventing damage to the rear stage device due to reverse phase, unbalanced overcurrent, unbalanced overvoltage, and the like.

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.

R, S, T ... Phase 3 (power line)
N ... Neutral line
Rt ... The winding wound around the phase of T phase among the powers of R phase
Rs ... The phase of the phase of S phase
Rr ... The phase of the R phase
St ... A winding wound around the phase of T phase among the power of S phase
Ss ... The phase of the S phase
Sr ... The phase of the phase of the R phase
Tt ... A winding wound around the phase of T phase among the powers of T phase
Ts ... The winding wound around the phase of S phase among the powers of T phase
Tr ... A winding wound around the phase of R in the power of T phase
Rr1, Rs1, Rt1 ... The waveform of the image harmonics (the waveform that is opposite in phase to the power phase is canceled out)
100 ... Power supply
150 ... Hybrid trance
190... Reverse phase detector
200 ... Power quality recovery device
210... Disconnection detector
220 ... Current detector
230 ... Temperature detector
240 ... Power quality restorer (reverse phase, neutral wire break, power unbalance, video harmonic)
250 ... Controller
260 ... Alarm generator
270 ... Alarm release signal input section
280... The vector through each of the different phases of the hybrid transformer
300 ... Distribution board with eco-friendly power-saving power quality recovery system
M1 ... A first switch for connecting the hybrid transformer
M2 ... A second switch for interrupting the reverse phase power and the abnormal power
M3 ... A third switch for recovering the reverse phase power to the normal state

Claims (6)

In the overall distribution with neutral recovery and harmonic attenuation,
It is connected to the power supply device equipped with a transformer and a circuit breaker for supplying power through three-phase three-wire (R, S, T) or three-phase four-wire (R, S, T, N), and is provided in the power supply device. Detects the abnormal state of the power line and the neutral line, if the reverse phase of the power line is detected, connect the reverse phase recovery switch, and if the abnormal power of the power line is disconnected, the hybrid to recover the neutral line abnormality if the abnormality of the neutral line is detected By connecting the transformer to the power line, the neutral disconnection recovers by reducing the unbalanced current of the three-phase power supply, and the image harmonics generated at the load pass through three phases for each phase to reduce the unbalanced power of the neutral wire to maintain normal power. The main distribution panel with an eco-friendly power-saving power quality recovery device, characterized in that it includes a power quality recovery device. 2. The apparatus of claim 1,
A reverse phase detector for detecting whether or not the power line is inverted;
A solid line detector for detecting whether the neutral line is disconnected;
A current detector for detecting that an abnormal current flows in the neutral line and the power line;
A temperature detector for detecting the temperature of the neutral line;
The power quality is determined by the reverse phase detection value output by the reverse phase detector, the disconnection detection value output by the disconnection detector, the abnormal current value output by the current detector, and the temperature detection value output by the temperature detector. A controller for determining whether there is an error and generating control signals for reverse phase and abnormal power recovery of the neutral line and the power line when an abnormal current flows in the reverse phase of the power line and the neutral line or the power line and the neutral line;
Recover the reverse phase of the power line provided in the power supply device and the abnormal power of the power line and the neutral line according to the control signal generated by the controller to restore the reverse phase power to the normal phase, and recover the abnormal voltage due to the disconnection of the neutral line. Equipped with an eco-friendly power-saving power quality recovery device including a power quality restorer that reduces the balance of power (voltage, current) and image harmonics, and outputs a control signal to cut off power when abnormal power is detected even after the abnormal power recovery. One distribution overall. 3. The apparatus according to claim 2,
The neutral line and phase single phase voltages are respectively measured, and when the neutral line and phase single phase voltages are unbalanced, a neutral line disconnection detection value is output and transmitted to the controller. First half. 3. The apparatus of claim 2, wherein the current detector comprises:
And an electric power saving device of eco-friendly power saving type, characterized in that if the current flowing through the neutral line is detected and more current is detected than a predetermined reference value, an abnormal current detection value is output and transmitted to the controller. The apparatus of claim 2, wherein the temperature detector comprises:
And a power distribution device equipped with an eco-friendly power saving type power quality recovery device, characterized in that for measuring the temperature of the neutral wire in real time and outputting an abnormal current detection value to the controller when a temperature exceeding a set reference value is detected. The method of claim 1, wherein the power quality restorer,
Maintains unbalance of phase voltage and phase current unbalance at phase voltage balance and phase current balance, and restores the hybrid transformer to reduce image harmonics, the first switch for connecting the hybrid transformer, and the reverse phase power of the power line to normal power. Distribution panel comprising a second switch for the power off or abnormal power, and eco-friendly power-saving power quality recovery device including a third switch.

Images