KR101302806B1 - Eco-friendly energy-saving power quality recovery equipment equipped switchboards - Google Patents

Abstract

PURPOSE: A switchgear assembly having a built-in eco-friendly energy-saving power quality recovery equipment is provided to quickly recover abnormal current flowing in a power line or a neutral line, thereby preventing generation of overvoltage. CONSTITUTION: A power quality recovery equipment comprises a reverse phase detector to detect a reverse phase of a power line; a disconnection detector (210) to detect whether a neutral line is disconnected; a current detector (220) detects flow of abnormal current in the neutral line and the power line; a temperature detector to detect a temperature of the neutral line; and a controller (250) to generate a control signal for cutting off electric power. [Reference numerals] (190) Reverse image detector; (200) Circuit breaker control signal; (210) Disconnection detector; (220) Current detector; (230) Temperature detector; (240) Power quality restoration device; (250) Controller; (260) Alarm generator; (270) Alarm lifting signal input; (AA) Temperature detection; (BB) R, S, T, N phase, account; (CC) R, S, T, N converter (CT)

Description

Switchgear panel with built-in eco-friendly energy-saving power quality recovery device {Eco-friendly energy-saving power quality recovery equipment equipped switchboards}

The present invention relates to a switchgear with an eco-friendly power-saving power quality recovery device, and more specifically, in the three-phase four-wire or three-phase three-wire distribution system (water switchgear) reverse phase and neutral line disconnection of power lines or power lines and neutral lines When an abnormal current occurs, the reversed phase is restored to a normal phase, prevents the occurrence of unbalanced overcurrent and unbalanced overvoltage due to disconnection of the neutral line, maintains a steady voltage, and maintains power unbalance. In addition, the present invention relates to a switchgear with an eco-friendly power-saving power quality recovery device that can attenuate image harmonics and prevent waste of power due to power quality degradation.

In general, in power systems, the 22.9kv-y power distribution system directly powers large customers, such as factories and buildings, from substations through three-phase four-wire distribution lines, or through small transformers or homes through secondary transformers. It is a way to supply power.

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

The three-phase four-wire distribution system supplies power by combining the neutral line (N) and the power line (R phase, S phase, T phase) by a method such as a Y connection, a delta connection, and a delta connection. In this case, when one power line and another power line are connected, 380V becomes, and when one power line (for example, A phase) and the neutral line (N) are connected, it becomes 220V and supplies power to the load.

In this case, the neutral line N means a line in which one line of each phase is common in a multiphase multi-line line. In principle, three wires require six strands. 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.

Due to the characteristics of the power distribution system in Korea, which adopts three-phase four-wire system, unbalanced current flows in the neutral and power lines due to the mixing of single-phase and three-phase loads.When unbalanced currents occur, the efficiency of the transformer decreases and power is wasted. It can cause burns. 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 are frequencies that are integer multiples, such as 2, 3, and 4 times the fundamental frequency, and are called distortion or distortion waves, especially high frequency orders such as 3, 6, 9, etc. The high frequency component corresponding to the multiple of 3 is called image harmonic.

Since the phase harmonics of three phases have in-phase values, up to three times the image harmonics flow by being superimposed on a neutral line as if three single-phase power sources are connected in parallel. When excessive image harmonics flow in the neutral wire, the bushing part is disconnected due to the overheating of the neutral conductor, or the neutral wire is excessively flowing in the disconnection wire or the neutral wire and the power line.

If the neutral wire is disconnected, damage of the load-side earth leakage breaker with a large impedance occurs, and an accident occurs that the load of the elevator weak circuit equipment connected to the neutral wire and the voltage side line burns out. In addition, excessive current flow through the neutral and power lines is a waste of power and provides a source of damage to transformers and neutrals.

If this is explained in more detail as follows.

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

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

However, if the neutral wire (N) is disconnected or excessive current flows in the neutral wire 220V is gone, there is only 380V. That is, the neutral wire does not flow through the current and flows from the A phase to the B phase through the load in series.

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, .

Here, even when the load is balanced, the voltage is changed and when the neutral wire is connected, the voltage between the neutral wire and both voltage lines (power line) is equal to 220V, but when the neutral wire is disconnected, voltage unbalance occurs. Unbalance increases gradually due to disconnection, burnout, etc., and almost all light-loaded devices that end up are damaged.

In conclusion, if the neutral wire is disconnected in the three-phase four-wire distribution system, the voltage at the lightly loaded terminal is increased, the heavy load is decreased, and the light load is abnormal. As a result, the circuit is opened due to a switch off or a failure, and voltage unbalance is intensified, and in the related art, almost all light load electric equipment is damaged.

On the other hand, even in the single-phase three-wire distribution system, if the neutral wire is disconnected, an overvoltage flows, causing a problem that the load-side electric equipment is damaged. In addition, when power unbalance and image harmonics are generated due to the cause of the load, electric power is wasted and electrical accidents that overheat or burn out equipment of the distribution system occur.

In order to solve all the problems caused by the disconnection of the neutral wire, the conventionally proposed technology is registered in Korea Patent Office Registration No. 10-1052471 (registered on July 2, 2011) (Invention: Neutral wire replacement device and method in the power system) ) (Hereinafter abbreviated ″ Prior Art 1 ″) and Korea Patent Office Registration No. 10-0883771 (Invention name: Electronic relay for reverse phase and phase protection) (hereinafter referred to as ″ Prior Art 2 ″) It is.

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 proposed to solve various problems occurring in the conventional neutral conductor replacement device as described above.

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 It is to provide a switchgear 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 problem to be solved by the present invention is to provide a switchgear with an eco-friendly power saving power quality recovery device that can reduce the neutral wire replacement device due to power unbalance, or reduce the waste of unnecessary power.

Another problem to be solved by the present invention is to reduce the harmonics caused by the failure of the neutral wire to prevent the burnout of the neutral wire replacement device, and to restore the power quality to save the electric energy to save the electric energy built-in It is to provide a switchboard.

Another problem to be solved by the present invention is to provide a switchgear with a built-in eco-friendly power-saving power quality recovery device to warn when the neutral wire disconnection or the 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. It is to provide a switchgear with an eco-friendly power-saving power quality recovery device to prevent damage to the load device due to overvoltage and overcurrent due to burnout of the mechanical device due to reversed phase and abnormal neutral wire.

Switchgear with a built-in 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. When the reversed phase of the power line is detected, if two phases of the three phases (R, S, T) included in the power line are replaced and connected, the reverse phase is restored to the normal phase and the power of the power line and the neutral line If an abnormality is detected (voltage, current), the inductance for restoring the power line and the neutral line is connected to the power line to recover the unbalanced voltage and unbalanced current through a power quality restorer, and reduce the generated harmonics to maintain normal power. It is characterized by including a power quality recovery device.

The power quality recovery apparatus,

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

A disconnection 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 a 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.

The disconnection detector,

The single-phase voltage of the neutral and three phases is measured, and when the unbalanced voltage of the single-phase voltages of the neutral and three phases is detected, a neutral line disconnection detection value is output and transmitted to the controller.

The current detector,

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,

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,

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 switchgear incorporating an eco-friendly power-saving power quality recovery apparatus according to an 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 switchgear having an eco-friendly power saving type power quality recovery apparatus according to an exemplary 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 for detecting the temperature of the neutral wire; 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.

The switchgear with the eco-friendly power-saving power quality recovery device according to the present invention configured as described above, after receiving the power supplied from the Korea Electric Power through the primary transformer, the power supply device 100 through the Y connection method, such as distribution boards and switchboards Will be supplied.

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 an accident in advance in the present invention, the power quality recovery apparatus 200 detects the state of the power line and the neutral line at all times, and when the power line reverse phase occurs, the switch provided in the power quality restorer 240 operates to reverse power. It cuts off with the switch (M2) connected during normal operation and immediately generates an alarm, and operates the power switch (M3) for converting the reverse phase to the normal phase to restore the reverse phase power to the normal power, disconnection of the neutral wire or When an abnormal current or power unbalance is detected on the power line and the neutral line, an alarm is performed immediately and the hybrid transformer 150 provided in the power quality restorer 240 is operated to compensate for the power imbalance between phases, and at the same time, overvoltage is applied to the light load side. It prevents flow, maintains power unbalance, and eliminates harmonics in the neutral.

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, the disconnection of the neutral wire is determined by determining whether the neutral wire and each phase have voltage unbalance. 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, a contact failure detection device detects whether a neutral wire terminal has a poor contact and determines disconnection of the neutral wire. The current detector 220 determines whether the neutralization line is broken or not based on the reference value of the current flowing through the neutral line. Another method is to compare the current ratio of three phases (Ri + Si + Ti = Ni, Ri + Si + Ti + Ni = 0), and if an abnormal current occurs in the neutral line and the power line, it is determined as an overcurrent. 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, current unbalance is maintained at current equilibrium, neutral harmonic overheating, middle wire failure, burnout of neutral wire replacement device, damage to distributors such as transformers are reduced by reducing image harmonics, and power consumption is reduced 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 alarm release signal is transmitted, the controller 250 stops the operation of the alarm generator 260 to release 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... 3-phase phase (power line)
N ... Neutral
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 unit
280... The vector through each of the different phases of the hybrid transformer
300 ... Switchgear with eco-friendly power-saving power quality recovery device
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 switchgear with the function of restoring the reversed phase to the normal phase, the neutral line recovery function and the harmonic attenuation function,
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 neutral line, and if the reverse phase of the power line is detected, the two phases of the three phases provided in the power line are alternately connected to restore the reverse phase to the normal phase, and then cut off the power when the reverse phase is detected. When an abnormality in power (voltage, current) of the power line and the neutral line is detected, the power line and the neutral line power abnormality are connected to a power quality restorer, and the three-phase coils provided in the power quality restorer are three-phase voltage and current, respectively. It includes the power quality recovery device to recover the unbalance voltage on the load side, reduce the unbalance current on each side of the power supply, and reduce the image harmonics generated by the load through two or more phases. Switchgear with a built-in power-saving Eco power quality repair and wherein is. 2. The apparatus of claim 1,
A reverse phase detector for detecting whether the power line is reversed;
A disconnection detector for detecting whether the neutral line is disconnected;
A current detector for detecting abnormal current flowing through the neutral and power lines;
A temperature detector for detecting a 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. Determining whether there is an abnormality, and when the reverse phase of the power line or the disconnection of the neutral line or an abnormal current flows in the power line and the neutral line, the control signal for recovering the reverse phase of the power line and the disconnection of the neutral line and the abnormal power of the power line and the neutral line A controller which generates a control signal and outputs a control signal that cuts off power when detecting abnormal power even after the abnormal power recovery;
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. And eco-friendly power-saving power quality recovery device, which includes a power quality restorer which reduces the balance of power (voltage, current) and reduces image harmonics, and cuts off the power when detecting abnormal power even after the power recovery. One switchboard. 3. The apparatus according to claim 2,
A switchgear equipped with an eco-friendly power saving type power quality recovery device comprising measuring the neutral wire and the phase single phase voltage, respectively, and outputting the neutral wire disconnection detection value when the unbalanced voltage between the neutral wire and the phase single phase voltage is detected. . 3. The apparatus of claim 2, wherein the current detector comprises:
A switchgear having an eco-friendly power saving type power quality recovery device, characterized in that for measuring the amount of current flowing through the neutral line and outputting an abnormal current detection value to the controller if more current is detected than a set reference value. The apparatus of claim 2, wherein the temperature detector comprises:
And a switchgear equipped with an eco-friendly power saving type power quality recovery device, characterized in that the temperature of the neutral wire is measured in real time and an abnormal current detection value is output to the controller when a temperature exceeding a set reference value is detected. The method of claim 1, wherein the power quality restorer,
The power quality recoverer maintains the phase voltage unbalance and the phase current unbalance at phase voltage balance and phase current balance, and reduces the harmonics of the hybrid transformer and the first switch, and restores the reverse phase power of the power line to the normal power. Switchgear with a built-in eco-friendly power-saving power quality recovery device, characterized in that it comprises a second switch and a third switch.

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