KR101415814B1 - Cabinet panel of built-in neutral line repair function and control method thereof - Google Patents

Abstract

Disclosed is a distribution method and a control method thereof, which is provided with a neutral line recovery function that prevents occurrence of an overvoltage, maintains a normal voltage when a neutral line (N) disconnection occurs in the entire distribution, and notifies an abnormal state .
A distribution system having a neutral line recovery function, comprising: a power supply device having a main breaker and a distribution breaker; The power supply device is connected to the power supply device and detects a disconnection of the neutral line. When the disconnection of the neutral line is detected, one end of the inductance is connected to the neutral line for recovery to prevent the occurrence of the overvoltage through the neutral line recovery, And notifies the abnormal state of the entire distribution.

Description

Technical Field [0001] The present invention relates to a distribution panel having a neutral line repair function and a control method thereof,

More particularly, the present invention relates to a distribution method and a control method thereof for preventing the occurrence of an overvoltage and maintaining a normal voltage when a neutral line (N) And a control method thereof. [0002] The present invention relates to a distribution system and a control method thereof.

In general, a cabinet panel is equipped with an image harmonic filter to remove image harmonics.

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. 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. 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.

Therefore, various methods have been proposed in order to attenuate the excessive image harmonics. Among them, a Zig Zag connection transformer (jig-jag transformer) connected to three phase lines and a neutral line is used to reduce the image impedance Typically, there is a device that compensates image harmonics by preventing image harmonics from flowing from the neutral line to the load system side and absorbing it to 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.

[0002] A conventional technique for distributing an image using a harmonic filter using a zigzag wiring transformer is disclosed in Korean Patent Registration No. 10-0795037 entitled " Image Harmonic Reduction Device with Overload Protection Function " (Hereinafter abbreviated as " Prior art 2 ") and Korean Patent Registration No. 10-0849463 (entitled " Image Harmonic Reduction Apparatus with Overload Prevention Device " .

In the disclosed prior art 1, a plurality of circuit breakers are connected to the entire distribution, three phases (A, B, C) and a neutral line N of the power source are connected to the phase lines A, B and C and a neutral line N. The neutral line N is interrupted by a shutoff switch so that the circuit is shut off when the connection transformer rises above a predetermined temperature and the temperature of the connection transformer is again lower than a predetermined temperature It operates to overload protection function to automatically recover the ground circuit.

In addition, the disclosed prior art 2 includes a three-phase line R (R, S, T) which is connected to three-phase lines R, S, T and a neutral line N of a power source passing through the entire distribution, , S, T), and a coil constituting the electromagnetic contactor is connected to a temperature switch incorporated in the image harmonic reduction device, and the three-phase line R , S, T) of the electromagnetic contactor is opened and closed.

In the conventional art 2 configured as described above, a temperature switch is built in the image harmonic reduction device, and the input terminal of the three-phase line (R, S, T) introduced into the reduction device is connected to the electromagnetic contactor connected to the temperature switch, The temperature switch is turned on / off so that the switch of the electromagnetic contactor connected to the three-phase lines R, S, T is opened or connected so that the image harmonic reduction device is connected to the main circuit Thereby preventing burnout of the abatement device due to overload, and stably operating the entire system without opening and closing the neutral line.

1. Korean Patent Registration No. 10-0795037 (entitled: Image Harmonic Reduction Device with Overload Protection Function) 2. KIPO Registration No. 10-0849463 (entitled "Harmonics Reduction Device with Overload Protection Device")

However, the above-described conventional techniques have an advantage that the image harmonics flowing in the neutral line can be reduced to a certain extent. However, when the neutral line is disconnected due to image harmonics or overheating, measures against neutral line disconnection are not taken at all, Resulting in a problem that the load device is burned out.

In addition, it is impossible to check power quality in the entire distribution, and it is impossible to notify a remote manager when a neutral wire breakage is detected or a power quality problem occurs.

In addition, the above-described prior arts have a disadvantage in that it is not possible to operate a breaker in the entire distribution system located remotely through a portable terminal.

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 provide a distribution having a neutral line recovery function to prevent occurrence of an overvoltage, maintain a normal voltage when a neutral line (N) disconnection occurs in the entire distribution, And a control method thereof.

Another problem to be solved by the present invention is to provide a distribution system having a neutral line recovery function for detecting a current flowing through a neutral line and operating a jig-jag transformer when an excessive current flows (over a reference value) And to provide a control method.

Another object to be solved by the present invention is to provide a neutralization line recovery function capable of detecting a neutral line disconnection and restoring the neutral line when the neutral line disconnection is detected, thereby preventing overvoltage generated by the disconnection of the neutral line, And a control method thereof.

Another problem to be solved by the present invention is to transmit the abnormality of the entire distribution to a remote manager terminal (in particular, a smart phone), to automatically receive a blocking command transmitted from a remote manager terminal, And a method of controlling the same.

In order to solve the above-mentioned problems, according to the present invention,

In the first half of the distribution,

A power supply device having a main breaker and a distribution breaker;

The power supply device is connected to the power supply device and detects a disconnection of the neutral line. When the disconnection of the neutral line is detected, one end of the inductance is connected to the neutral line for recovery to prevent the occurrence of the overvoltage through the neutral line recovery, And a neutral line recovery device for notifying the abnormal condition of the entire distribution.

In the above-mentioned neutral line recovery apparatus,

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

A neutral line state detector for measuring the neutral line voltage and the ground voltage and outputting a disconnection detection value to the neutral line when the neutral line voltage and the ground voltage are detected;

A power tester for inspecting a current detected by a plurality of current converters provided in a power line provided in the power supply device to check power quality and outputting power quality check result data;

Generating a control signal for reducing image harmonics and recovering a neutral line according to a current detection value and a disconnection detection value outputted by the current detector and the neutral line state detector and searching the power quality inspection result data output from the power tester, A controller for generating an anomaly notification signal including an alarm control signal and a distribution overall position information when an abnormality occurs in quality or when image harmonics increase or when a neutral line disconnection is detected;

And a neutral ray recoverer for reducing image harmonics flowing in the neutral line according to a control signal generated by the controller or restoring the neutral line to maintain the balance of the single-phase voltage.

In the above-mentioned neutral line recovery apparatus,

An alarm generator for generating an abnormality in power quality or an increase in image harmonics or an alarm for disconnection of a neutral line according to an alarm control signal generated in the controller;

A memory for storing location information on the entire distribution and storing abnormality notification information output from the controller;

Further comprising a communication module for transmitting the abnormality notification information output from the controller to a terminal or a management server carried by the manager and for receiving a breaker operation command remotely transmitted from the terminal carried by the manager to the controller, ,

And the controller operates the main breaker and the discharge breaker when the breaker operation command is received.

In the above,

A first switch operating according to a control signal for reducing image harmonics;

A jig-jig transformer that operates during operation of the first switch to reduce a current flowing through the neutral line to remove image harmonics;

And a second switch for maintaining balance of the single-phase voltage by connecting each phase to the restoration neutral line (N).

In addition, the present invention provides a distribution control method having a neutral line recovery function,

CLAIMS 1. A method for reducing image harmonics and recovering a neutrally broken line,

(a) detecting a current flowing in a neutral line when power is supplied;

(b) comparing the detected current with a reference set value to determine whether the image harmonics are increased, and if the image harmonics increase, operating the jig-jag transformer to reduce the image harmonics;

(c) determining whether the image harmonic is increased by detecting a current flowing through the neutral line after the jig-jag trans-operation, and operating the breaker when the image harmonics are not decreased;

(d) detecting whether the neutral wire is disconnected through detection of a neutral wire and a ground voltage;

(e) if it is determined that the detection result indicates the disconnection of the neutral line, recovering the disconnected neutral line by operating the neutral line recovery unit;

(f) checking whether the neutral wire is normally restored after the operation of the neutral wire recoverer, and operating the breaker if the neutral wire is not normally restored;

(g) generating an alarm for a neutral line disconnection after the breaker operation or after the image harmonics are reduced normally or after the neutral line is normally restored;

(h) releasing an alert when an alarm release request is generated after the alarm is generated.

According to the present invention, it is possible to prevent the occurrence of overvoltage and to maintain a normal voltage even when a neutral line (N) disconnection occurs in the entire distribution.

In addition, according to the present invention, when a current flowing through a neutral line is detected to increase an image harmonic, an image harmonic wave flowing in a neutral line can be attenuated by operating a jig-jag trans.

In addition, according to the present invention, it is possible to transmit an abnormal state of the distribution panel to a remotely located administrator terminal (in particular, a smart phone), to receive a block command transmitted from a remotely located manager terminal, There is also.

FIG. 1 is a block diagram of a distribution system equipped with a neutral ray restoration function according to the present invention,
FIG. 2 is a circuit diagram of an embodiment of the neutral ray recoverer of FIG. 1,
FIG. 3 is a flowchart illustrating a control method of the entire distribution including the neutral ray restoration function according to the present invention. FIG.

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 circuit diagram of a distribution system having a neutral line recovery function according to a preferred embodiment of the present invention. The apparatus includes a power supply device including a main breaker and a distribution breaker (MCCB), and a neutral line recovery device 200.

Here, the power supply is supplied with power through a three-phase four-wire system (R, S, T, N) and the detailed operation of the main breaker or MCCB included therein is the same as that of general distribution , And a detailed description of the corresponding portions will be omitted.

The neutral line recovery apparatus 200 operates the jig-jag transformer to reduce the image harmonics when an excessive current flows through the neutral line N provided in the power supply apparatus, detects the disconnection of the neutral line, It prevents the overvoltage from being generated by connecting one end of the inductance to the neutral neutral for recovery and maintains the normal voltage to prevent the load connected to the single phase electric power from being destroyed and notifies the abnormality of the entire distribution .

The neutral line recovery apparatus 200 includes a current detector 220 for detecting a current flowing through a neutral line and a neutral detector for detecting the neutral line voltage and the ground voltage and detecting a disconnection detection value by a neutral line when the neutral voltage and the ground voltage are detected And a plurality of current transformers CT1, CT2 and CT3 provided on a power line provided in the power supply device 100 to check the electric power quality, And generates a control signal for reducing the image harmonics and recovering the neutral line according to the current detection value and the disconnection detection value output by the current detector 200 and the neutral line state detector 210 And the power quality inspection result data output from the power tester 280 is searched to determine whether the power quality abnormality occurs or the image harmonics increase, A controller 230 for generating an abnormal state notification signal including an alarm control signal and distribution position information when a disconnection line is detected; and a controller 230 for decreasing image harmonics flowing in the neutral line according to a control signal generated by the controller 230 And a neutral line recovery unit 240 for recovering the neutral line and maintaining the balance of the single-phase voltage.

The neutral line recovery apparatus 200 further includes an alarm generator 250 for generating an alarm regarding an abnormality in power quality or an increase in image harmonics or a neutral line according to an alarm control signal generated in the controller 230, A memory 260 for storing the installed position information and storing abnormality notification information output from the controller 230, and a terminal or management server carried by the manager, the abnormality notification information output from the controller 230, And a communication module 270 receiving the breaker operation command transmitted from the terminal carried by the manager and transmitting the received breaker operation command to the controller 230.

The controller 230 compares the current value detected by the current detector 220 with a reference setting value. If the detected current value exceeds the reference setting value, the controller 230 determines that the image harmonics have increased, And transmits the generated control signal to the neutral line recoverer 240. [

It is preferable that the controller 230 is implemented by 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 neutral ray restoring apparatus 200 according to the stored programs Do.

As shown in FIG. 2, the neutral ray recoverer 240 includes a first switch M1 operated according to a control signal for reducing image harmonics; Jig transformers (L1 to L6) that operate during the operation of the first switch (M1) to reduce the current flowing through the neutral line to remove image harmonics; And a second switch M2 for maintaining the balance of the single-phase voltage by connecting the phases (R, S, T) and the restoration neutral line (N).

In the power distribution apparatus having the neutral line recovery function according to the present invention configured as described above, three-phase four-wire type power is supplied by the Y wiring method in the power supply apparatus. At this time, If the harmonic wave is excessively flowed, the power quality changes, or the neutral line disconnection is detected, the power supplied to the load is abnormally generated, and the load device may be damaged.

In particular, if the image harmonics flow excessively to the neutral line, the neutral conductor may be overheated, the performance of the power transformer may deteriorate, voltage distortion, communication line noise, and malfunction of the electric and electronic equipments may occur. If the neutral wire is disconnected, the supplied voltage differs according to the capacity of the load. This causes an accident that the load device is burned down due to the abnormal voltage (overvoltage) at the light load side .

In order to prevent such an accident in advance, in the present invention, when the neutral line recovery apparatus 200 detects the state of the neutral line at all times, if an excessive image harmonic flows to the neutral line, a change occurs in the power quality, At the same time, the image harmonics are reduced or restored to other neutral lines to compensate for the phase voltage imbalance and to prevent the overvoltage from flowing under the light load so that the stable voltage is always maintained. In particular, when there is a change in the power quality, the power quality is detected and transmitted to the manager terminal or the management server so that a secondary damage due to a change in power quality is not generated.

More specifically, when power is supplied to the entire distribution, the current detector 220 detects the current flowing in the neutral line and transmits the current detection value to the controller 230. It is preferable to use a general CT for the current detection method.

The controller 230 compares a preset reference value (reference current value) to determine the current detected value and the amount of the image harmonics, and if the current detected value is equal to or lower than the reference set value, the image harmonics are not excessive If the current detection value is greater than the reference setting value, it is determined that the image harmonics are excessively flowing in the neutral line, and the control signal for reducing the image harmonics . In addition, the image harmonic increase detection information is stored in the memory 260 and the alarm generator 250 is operated to inform the outside that the image harmonics are increasing.

In addition, the controller 230 generates the abnormal state notification information including the image harmonics increase detection information stored in the memory 260 and the position information of itself (distribution position information of the distribution) stored in the memory 260, And transmits it to the communication module 270.

When the abnormal state notification information is received, the communication module 270 converts the received abnormal state notification information into wireless data, and transmits the converted wireless data to the manager terminal or the management server through the mobile communication network or the wireless Internet network . Herein, the method of connecting the communication module 270 with the mobile communication network or the wireless Internet network or the method of transmitting the wireless data to the manager terminal or the management server adopts the method used in the normal communication device as it is, It is omitted.

The remote administrator who receives the abnormal status notification information can quickly check the entire distribution and resolve the problem if it is determined that there is a possibility of a problem in the entire distribution. If the entire distribution notifying the abnormal state is far from the position and it takes a long time to arrive, the controller transmits a breaker operation command using the management terminal carried by the controller And transmits it to the communication module 270. The communication module 270 receives the message and transmits it to the controller 230. [

The controller 230 analyzes the received manager command and automatically operates the breaker if the command is a breaker operation command, so that the manager can operate the breaker in the entire distribution.

2, when the control signal for decreasing the image harmonics is transmitted from the controller 230, the neutral line restorer 240 operates in a state where the first switch M1 is on, The connected primary inductances L1 to L3 are connected to the secondary inductances L4 to L6 by a jig-jag method to form a jig-jag transformer. By this jig-jag transformer, image harmonics flowing in the neutral line are reduced do. The operation of the jig-jag transducer is disclosed in detail in the prior art document described in the technical background of the invention, and any person skilled in the art will be able to understand the operation of the jig- Is omitted.

The controller 230 continuously compares the current detection value detected by the current detector 220 with the reference set value, and if the current detected value is smaller than the reference set value It is determined that the image harmonics flowing through the neutral line is reduced and the image harmonic reduction and the first switch M1 provided in the neutral ray recoverer 240 are turned off to release the jig-jag trans.

In this case, when the manager sends a breaker operation command remotely to operate the breaker, the neutralizer recoverer 240 does not need to operate, and the neutralizer recoverer 240 can not operate the breaker operation command remotely .

Next, the neutral line state detector 210 operates to detect whether the neutral line N is disconnected, and transmits the detected disconnection detection value to the controller 230.

For example, the neutral line state detector 210 measures the voltage and / or the ground voltage of the neutral line and determines whether the neutral line is disconnected by checking whether the voltage is detected or the ground voltage is detected.

If it is determined that the disconnection of the neutral line is determined as a result of the determination, the neutral wire disconnection detection information includes the neutral wire disconnection abnormality information and provides the information to the controller 230. Here, the neutral line disconnection abnormality information may be a high signal (5V), and if the disconnection of the neutral line is not detected, the neutral line disconnection detection value may be a low signal (0V).

The controller 230 analyzes the disconnection detection value provided from the disconnection detector 210 by the built-in control program. If it is determined that the disconnection is not a disconnection line disconnection, the controller 230 does not operate the neutral line disconnection unit 240, And generates a control signal for restoring the neutral wire to the neutral wire recoverer 240 when it is determined.

In addition, the controller 230 stores the neutral wire disconnection detection information in the memory 260 and operates the alarm generator 250 to visually inform the outside that the neutral wire disconnection has occurred.

In addition, the controller 230 generates the abnormal state notification information including the neutral line disconnection detection information stored in the memory 260 and the location information (the location information of the entire distribution) stored in the memory 260, Module 270, as shown in FIG.

When the abnormal state notification information is received, the communication module 270 converts the received abnormal state notification information into wireless data, and transmits the converted wireless data to the manager terminal or the management server through the mobile communication network or the wireless Internet network .

The remote administrator who receives the abnormal status notification information can quickly check the entire distribution and resolve the problem if it is determined that there is a possibility of a problem in the entire distribution. If the entire distribution notifying the abnormal state is far from the position and it takes a long time to arrive, the controller transmits a breaker operation command using the management terminal carried by the controller And transmits it to the communication module 270. The communication module 270 receives the message and transmits it to the controller 230. [

The controller 230 analyzes the received manager command and automatically operates the breaker if the command is a breaker operation command, so that the manager can operate the breaker in the entire distribution.

As shown in FIG. 2, the neutral line recovery unit 240 internally includes a recovery neutral line N. When the control signal for neutral line recovery is transmitted by the controller 230, the second switch M2 operate to connect the restoration neutral line N and each phase coil (inductance) L1 to L3. That is, when the neutral line for recovery is always present, the neutral line for recovery is connected to the neutral line for recovery to recover the broken neutral line. Here, a neutral switch can be easily connected by using a magnet switch or the like.

When the neutral wire recoverer 240 operates to recover the disconnected neutral wire, the unbalance of the single-phase voltage of each phase, which may occur due to the neutral wire disconnection, can be maintained in the equilibrium state as before, The overvoltage is prevented from flowing under the light load as in the prior art and the normal voltage is maintained. Therefore, the overvoltage flows to prevent the electric appliance from burning down.

The neutral line recoverer 240 does not need to be operated when the manager operates the breaker by sending a breaker operation command remotely to the neutral line breaker and the neutral line breaker 240 does not receive the breaker operation command from the remote Only when it is necessary.

As another feature of the present invention, it is possible to check the quality of the power supplied to the load side in the entire distribution, and notify it in real time when an abnormality occurs in the power quality.

For example, the power lines of the power supply apparatus 100 are provided with current transformers CT1 to CT3, respectively, and detect currents of the respective phases and transmit them to the power tester 280. [ The power tester 280 converts the current of each phase to be transmitted into a digital signal and compares the detected current value with a built-in reference value to check whether the power of each phase is abnormal. Then, the power quality result data corresponding to the inspection result is generated and transmitted to the controller 230. Here, the voltage of each phase can be checked by using an image transformer (PT) instead of a current transformer in a power line of each phase. Here, the power quality result data includes the current amount data for each phase and the abnormality data.

The controller 230 analyzes the power quality result data transmitted from the power tester 280 and maintains the current state when there is no change in the power quality (if there is no abnormality). If there is a change in the power quality (If abnormal), the power quality result data is stored in the memory 260 and the alarm generator 250 is operated to visually inform the outside that the power quality is abnormal.

When abnormality occurs in the power quality, the controller 230 extracts the power quality result data and the position information (position information of the pneumatic transformer) stored in the memory 260 to generate abnormal state notification information, To the communication module 270 as shown in FIG.

When the abnormal state notification information is received, the communication module 270 converts the received abnormal state notification information into wireless data, and transmits the converted wireless data to the manager terminal or the management server through the mobile communication network or the wireless Internet network . Herein, the method of connecting the communication module 270 with the mobile communication network or the wireless Internet network or the method of transmitting the wireless data to the manager terminal or the management server adopts the method used in the normal communication device as it is, It is omitted.

The remote administrator can confirm the power quality status of the entire distribution at a remote location through the communication as well known. If the administrator who has confirmed the power quality status is concerned that there is a possibility of causing a problem in the entire distribution, You can check and fix the problem. If the entire distribution notifying the abnormal state is far from the position and it takes a long time to arrive, the controller transmits a breaker operation command using the management terminal carried by the controller And transmits it to the communication module 270. The communication module 270 receives the message and transmits it to the controller 230. [

The controller 230 analyzes the received manager command and automatically operates the breaker if the command is a breaker operation command, so that the manager can operate the breaker in the entire distribution.

In addition, according to the present invention, when an alarm is canceled within a preset time after performing an alarm for a neutral line disconnection and recovering a neutral line, the power (single phase electric power) supplied to the load is automatically cut off, And prevent accidents that may occur due to the accident. Although not shown in the figure, it is assumed that a power breaker is provided at the input terminal of single-phase power.

In addition, as is well known in the present invention, the neutral ray detector 240 continuously detects the neutral ray disconnection through the neutral ray state detector 210 while the neutral ray recoverer 240 is operated by the neutral ray disconnection. At this time, When the voltage unbalance is detected despite the operation of the unit 240, the controller 230 automatically operates the main breaker or cuts off the single-phase load power using the control signal, or simultaneously cuts the single-phase load power with the main breaker Thereby preventing the equipment of the load from being damaged.

FIG. 3 is a flowchart illustrating a distribution overall control method having a neutral ray restoration function according to a preferred embodiment of the present invention, which is performed by the controller 230 of the overall distribution as shown in FIG.

As shown in the figure, (a) detecting a current flowing in a neutral line when power is supplied (S101 to S103); (b) comparing the detected current with a reference set value to determine whether the image harmonics are increased, and if the image harmonics are increased, operating the jig-jag transformer to decrease the image harmonics (S105 to S107); (c) detecting a current flowing through the neutral line after the jig-jag trans-operation to judge whether the image harmonics are increased or not, and if the image harmonics are not decreased, operating the breaker (S121 to S123); (d) detecting whether the neutral wire is disconnected through detection of a neutral wire and a ground voltage (S109); (e) if it is determined that the detection result is a disconnection of the neutral line, recovering the disconnected neutral line by operating the neutral ray recoverer (S111 to S113); (f) a step (S125 to S127) of checking whether the neutral wire is normally restored after the operation of the neutral wire restor, and operating the breaker if the neutral wire is not normally restored; (g) generating (S115) an alarm for a neutral line break after the breaker operation or after the image harmonics are normally reduced or after the neutral line is normally restored; (h) a step (S117 to S119) of releasing an alarm when an alarm release request is generated after the alarm is generated.

When the power is supplied to the distribution apparatuses through the three-phase four-wire system in step S101, the current flowing in the neutral line through the current detector in step S103 . When the detected current value is larger than the reference value, it is judged that the image harmonic flows excessively to the neutral line, and the jig-jig The transformer is operated to reduce image harmonics flowing in the neutral line (S105 to S107).

After the jig-jag transformer is operated as described above, the process proceeds to step S121 to check whether the image harmonics have decreased normally. That is, after the jig-jag transformer is operated, the current flowing through the neutral line is detected again and compared with the preset reference value. If the detected current value is larger than the reference value, it is determined that the image harmonic has not been normally decreased In order to prevent a fire or the like from occurring due to an increase in image harmonics, a breaker operation control signal is automatically generated (S123). The breaker operation control signal generated is transmitted to each of the breakers (LBS, AISS, MCCB, etc.), and the power cut-off operation is performed.

After the breaker operation control signal is generated, the process proceeds to step S115 where the alarm generator 250 is driven to generate an alarm for the increase of the image harmonics by the audiovisual. When the alarm generated by the administrator is requested to be released, , And releases the generated alarm (S115 to S119).

If the image harmonics are normally reduced after the jig-jag transformer is operated after the increase of the image harmonics, the operation goes to step S115 to drive the alarm generator 250 to generate an alarm for the image harmonic increase by the audiovisual. Thereafter, when the alarm generated by the manager is requested to be released, the operation of the alarm generator 250 is stopped and the generated alarm is released (S115 to S119).

For example, when the image harmonics are normally decreased after the image harmonic wave is increased, only the image harmonic increase alarm is generated. When the image harmonic wave is not normally decreased after the jig- An alarm for the increase of image harmonics is generated.

On the other hand, if the image harmonics do not excessively flow to the neutral line, the process proceeds to step S109, and whether or not the neutral line is disconnected is detected through the disconnection detector. Here, the method of detecting whether or not the neutral wire is disconnected is detected by detecting the disconnection of the neutral wire in the same manner as the operation of the entire distribution including the above-described neutral wire recovery function, so a detailed description will be omitted in order to avoid redundant description.

If it is determined that the neutral line is disconnected (S111), the neutral wire recoverer 230 is driven to recover the disconnected neutral wire (S113). For example, if the neutral line is separately provided and the neutral line N in the power supply line is disconnected, one end of the inductance is connected to the neutral line to recover the neutral line, thereby preventing the occurrence of an overvoltage that may occur from the neutral line disconnection, The control line will not operate due to maintaining a steady voltage, preventing the functioning of the connected load (eg drain pump, fire hydrant, elevator, etc.) from being paralyzed.

After operation of the neutral ray recoverer, the operation proceeds to step S125 to check whether the neutral ray is normally recovered. If it is confirmed that the neutral ray is not normally recovered, that is, if the neutral ray is disconnected again through the disconnection detector, If it is detected, the process proceeds to step S127 to automatically generate a breaker operation control signal in order to prevent any problems caused by disconnection of the neutral line (S127). The breaker operation control signal generated is transmitted to each of the breakers (LBS, AISS, MCCB, etc.), and the power cut-off operation is performed.

After the breaker operation control signal is generated, the process proceeds to step S115 where the alarm generator 250 is activated to generate an alarm for the neutral line disconnection. Then, when the alarm generated by the administrator is requested to be canceled, And releases the generated alarm (S115 to S119).

If the neutral line is normally recovered after the neutral line breaker is operated, the flow advances to step S115 to drive the alarm generator 250 to generate an alarm for breaking the neutral line by audiovisual. Then, The operation of the alarm generator 250 is stopped and the generated alarm is released (S115 to S119).

For example, if the neutral wire is normally restored after the neutral wire is disconnected, only an alarm for the neutral wire is generated. If the neutral wire is not normally restored after the neutral wire is disconnected, an alarm for the neutral wire is generated after the breaker is operated.

According to the present invention, when the neutral line of the power supply device is disconnected in the distribution center, the automatic recovery is automatically performed to the neutral line for recovery, thereby preventing the abnormal voltage unbalance caused by the neutral line disconnection, . If an abnormality occurs in the middle line disconnection or the image harmonics or the power quality is abnormally generated, the alarm is generated and the manager can recognize the abnormality. Then, the manager can take the follow-up action promptly so that the neutral line disconnection, It is possible to prevent an accident such as a system malfunction or a load device burnout which may occur later due to the change.

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.

200 ... Neutral Line Recovery Device
210 ... Neutral Line State Detector
220 ... Current detector
230 ... Controller
240 ... Neutral Line Restore

Claims (5)

In the first half of the distribution,
A power supply device having a main breaker and a distribution breaker;
The power supply device is connected to the power supply device and detects a disconnection of the neutral line. When the disconnection of the neutral line is detected, one end of the inductance is connected to the neutral line for recovery to prevent the occurrence of the overvoltage through the neutral line recovery, And a neutral line recovery device for notifying the abnormal condition of the entire distribution,
The neutral ray restoration apparatus includes:
A current detector for detecting a current flowing through the neutral line; A neutral line state detector for measuring the neutral line voltage and the ground voltage and outputting a disconnection detection value to the neutral line when the neutral line voltage and the ground voltage are detected; A power tester for inspecting a current detected by a plurality of current converters provided in a power line provided in the power supply device to check power quality and outputting power quality check result data; Generating a control signal for reducing image harmonics and recovering a neutral line according to a current detection value and a disconnection detection value outputted by the current detector and the neutral line state detector and searching the power quality inspection result data output from the power tester, A controller for generating an anomaly notification signal including an alarm control signal and a distribution overall position information when an abnormality occurs in quality or when image harmonics increase or when a neutral line disconnection is detected; And a neutral ray recoverer for reducing the image harmonics flowing in the neutral line according to the control signal generated by the controller or restoring the neutral line to maintain the balance of the single-phase voltage.
delete The apparatus according to claim 1,
An alarm generator for generating an abnormality in power quality or an increase in image harmonics or an alarm for disconnection of a neutral line according to an alarm control signal generated in the controller;
A memory for storing location information on the entire distribution and storing abnormality notification information output from the controller;
Further comprising a communication module for transmitting the abnormality notification information output from the controller to a terminal or a management server carried by the manager and for receiving a breaker operation command remotely transmitted from the terminal carried by the manager to the controller, ,
Wherein the controller operates the main breaker and the discharge breaker when the breaker operation command is received.
[3] The apparatus according to claim 1,
A first switch operating according to a control signal for reducing image harmonics;
A jig-jig transformer that operates during operation of the first switch to reduce a current flowing through the neutral line to remove image harmonics;
And a second switch for maintaining the balance of the single-phase voltage by connecting each phase to the restoring neutral line (N).
(a) detecting a current flowing in a neutral line through a current detector when power is supplied from the controller;
(b) comparing the current detected by the controller with a reference set value to determine whether the image harmonics increase, and if the image harmonics increase, operating the jig-jag transformer of the neutral beam recoverer to reduce the image harmonics;
(c) determining whether the image harmonic is increased by detecting a current flowing through the neutral line after the operation of the jig-jag transducer in the controller, and if the image harmonic is not decreased, operating the breaker;
(d) detecting a neutral line and a ground voltage using a neutral line state detector and determining whether the neutral line is disconnected;
(e) if the controller determines that it is determined that the neutral line is a broken line, recovering the broken neutral line by operating the neutral line restorer;
(f) checking whether the neutral wire is normally restored after the operation of the neutral wire recoverer in the controller, and operating the breaker if the neutral wire is not normally restored;
(g) generating an alarm for the neutral line break after the breaker operation or after the image harmonics are normally reduced or the neutral line is normally restored in the controller;
(h) releasing an alarm generated when an alarm release request is generated in the controller after the alarm is generated.

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