KR20120086557A - Distrtibuting board cabinet panel with neutral line replacement and method thereof - Google Patents

Distrtibuting board cabinet panel with neutral line replacement and method thereof Download PDF

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Publication number
KR20120086557A
KR20120086557A KR1020110007870A KR20110007870A KR20120086557A KR 20120086557 A KR20120086557 A KR 20120086557A KR 1020110007870 A KR1020110007870 A KR 1020110007870A KR 20110007870 A KR20110007870 A KR 20110007870A KR 20120086557 A KR20120086557 A KR 20120086557A
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South Korea
Prior art keywords
phase
neutral wire
neutral
alarm
wire
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KR1020110007870A
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Korean (ko)
Inventor
김인태
Original Assignee
(주)한국이엔씨
김인태
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Priority to KR1020110007870A priority Critical patent/KR20120086557A/en
Publication of KR20120086557A publication Critical patent/KR20120086557A/en

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02Details
    • H02H3/04Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H02H3/046Signalling the blowing of a fuse
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/34Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
    • H02H3/353Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system involving comparison of phase voltages
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/22Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
    • H02H7/226Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires

Abstract

Disclosed is a distribution panel equipped with a neutral conductor replacement function for preventing a load device from being burned out due to overvoltage when a neutral line disconnection occurs in a three-phase four-wire system. .
Distribution panel with a neutral wire replacement function is disclosed, the distribution circuit breaker (MCCB); A circuit breaker provided in each of the branch circuits and performing a shut-off operation when a short circuit occurs when power is supplied to the load; Detects the phase loss of the three-phase four-wire (R, S, T, N) supply power input to the distribution panel, and if the phase detection is detected, it is determined to be a neutral wire disconnection and replaces the neutral wire so that the load connected to the single phase power is burned out. An image sensor having a neutral wire replacement device for preventing a phase change from the neutral wire replacement device to detect a phase loss of power supplied to the distribution board; A controller for judging the disconnection of the neutral wire and generating a control signal for replacing the neutral wire when an open phase is detected; Implemented as a neutral line protector, which replaces the neutral line and balances the single-phase voltage.

Figure P1020110007870

Description

Distribution board with neutral wire replacement function and neutral wire replacement method of the distribution board {Distrtibuting board cabinet panel with neutral line replacement and method

The present invention relates to a distribution board equipped with a neutral wire replacement function and a neutral wire replacement method in the distribution board, and more particularly, in the case of a neutral line disconnection in a three-phase four-wire distribution board, The present invention relates to a distribution panel having a neutral wire replacement function for preventing the apparatus from being burned out and a method for replacing the neutral wire of the distribution board.

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 method of supplying power to the electricity, and it is the distribution system that is used at this time.

Herein, the cabinet panel means a switch is provided for each branch circuit in the indoor wiring where the branch circuit is divided from the trunk line to each branch circuit. Housing panels are simple, with cut-out switches arranged in place, but in buildings, at least on each floor there are steel panels in the walls and complete opening and closing doors.

Such a general distribution panel is provided with a circuit breaker (MCCB) and an earth leakage breaker (ELB) when a short circuit is detected, and supplies power to a load (light, RECEP, broadcasting device power, etc.). If a short circuit occurs at the time, a blocking operation is performed to prevent a fire.

On the other hand, the general distribution panel as described above consists of a three-phase four-wire distribution system, in particular, the neutral wire (N) and power lines (A phase, B phase, C phase) by the method of Y, Delta, W delta, etc. To supply power. 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, if the phases of a single-phase two-wire line are twisted by 120 ° and one line is made common, the potential is reduced to four strands. This zero potential (zero potential) immediately becomes the reference potential, and so-called N-phase, that is, the neutral line.

In this state, the neutral should in principle have a zero potential, which is an earth potential, but may actually have some voltage when the phase of each phase is not exactly 120 ° out of the field. At this time, if the neutral line is commonly connected to the ground line, which is the earth potential line, 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 distribution system in Korea, which adopts three-phase four-wire system, unbalanced current flows in the neutral wire due to the mixing of single-phase and three-phase loads.In recent years, computers, LED lighting devices, copiers, office equipment, uninterruptible power supply Increasing nonlinear loads, such as UPS, have caused more image harmonics to flow through the neutral.

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 or the neutral wire is disconnected due to overheating of the neutral conductor.

If the neutral wire is disconnected, damage of the load-side leakage circuit 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.

If this is explained in more detail as follows.

Figure 1 shows the phase voltage and current flow of the normal circuit in the power system of a three-phase four-wire distribution 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, 220V disappears and only 380V exists. 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 shown in the circuit diagram shown in Fig. 2, the impedance of each phase and the neutral wire is inversely proportional to the load of the phase A and the load of the phase B, so that 380V is connected in series, so that the load on the light load side is burned out. Will occur.

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 is becoming increasingly severe due to disconnection, and almost all of the 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.

However, the general distribution panel does not apply the protection technology to check the neutral wires for the neutral wires or to prevent the damage of the light-loaded electric equipment in the event of the neutral wires, so that the light load electric devices are damaged when the neutral wires are disconnected. This occurred.

Accordingly, the present invention has been proposed to solve all the problems occurring in the conventional distribution as described above,

The problem to be solved by the present invention is to provide a distribution board with a neutral wire replacement function and a neutral wire replacement method for the distribution board to prevent the device of the load from being burned due to overvoltage when a neutral line disconnection occurs in the distribution board. To provide.

Another object of the present invention is to provide a distribution panel equipped with a neutral conductor replacement function capable of quickly and accurately detecting disconnection of a neutral conductor and a neutral conductor replacement method of the distribution panel.

Another problem to be solved by the present invention is to provide a distribution board with a neutral wire replacement function and a neutral wire replacement method for the distribution board that warns when a neutral wire break is detected, so that subsequent actions can be made.

Another problem to be solved by the present invention, the distribution panel having a neutral wire replacement function for preventing the burnout of the load connected to the single-phase power to cut off the single-phase power supplied to the load when the neutral wire break occurs in the distribution panel and its distribution It is to provide a way to replace the neutral in the first half.

"Distribution board with neutral wire replacement function" according to the present invention for solving the above problems,

A breaker (MCCB);

A circuit breaker provided in each of the branch circuits and performing a shut-off operation when a short circuit occurs when power is supplied to the load;

Detects the phase loss of the three-phase four-wire (R, S, T, N) supply power input to the distribution panel, and if the phase detection is detected, it is determined to be a neutral wire disconnection and replaces the neutral wire so that the load connected to the single phase power is burned out. It is characterized by including a neutral wire replacement device to prevent.

The neutral wire replacement device,

An image detector for detecting an image of power supplied to the distribution board;

A controller for determining an open circuit by detecting the open phase by the open phase detector and generating a control signal for replacing the neutral line;

And a neutral line protector that replaces the neutral line of the supply power according to a control signal generated by the controller and maintains a single phase voltage balance.

The imaging detector,

A phase detector for detecting phase signals of R, S, and T phases;

It characterized in that it comprises an image determination determiner to determine the phase if the level of any one of the R, S, T phase detected by the phase detector lasts for a predetermined time or more at a high level.

The neutral line protector,

A switch for connecting three phases (R, S, T);

It characterized in that it comprises a coil for maintaining the balance of the single-phase voltage by connecting the three-phase and the neutral neutral (N).

The neutral wire replacement device,

An alarm generator for alarming the disconnection of the neutral wire according to the alarm generation control signal output by the controller;

And an alarm release signal input unit configured to generate an alarm release signal and transmit it to the controller when an alarm release switch for alarm release is operated by an administrator after an alarm is generated by the alarm generator.

The "neutral wire replacement method of the distribution panel" according to the present invention for solving the above problems,

In the controller provided in the neutral wire replacement device for performing a protection operation during the disconnection of the neutral wire,

Detecting the disconnection of the neutral wire by detecting a phase loss of the 3-phase 4-wire power supplied to the distribution board;

If it is determined that the neutral wire is disconnected, operating the neutral wire protector to replace the disconnected neutral wire;

Generating an alarm for neutral wire disconnection after the neutral wire replacement;

Releasing the generated alarm if an alarm releasing request occurs after the alarm is generated;

It characterized in that it comprises the step of automatically disconnecting the single-phase power supplied to the load if the alarm release request does not occur within a predetermined time after the alarm occurs.

According to the present invention, when a neutral line disconnection occurs in the distribution panel, the neutral line is quickly replaced, thereby preventing the load device from being burned by the overvoltage.

In addition, according to the present invention can detect the disconnection of the neutral wire quickly and alert it, there is an advantage that can help the administrator to quickly follow up.

In addition, according to the present invention, when a neutral wire break occurs in the distribution panel, the single-phase power supplied to the load is cut off, thereby preventing the burnout of the load connected to the single-phase power.

1 is a phase voltage and current flow chart of power supplied to a general distribution board.
FIG. 2 is an explanatory diagram for explaining an abnormal voltage occurrence state when a neutral wire is disconnected in power supplied to a general distribution board. FIG.
Figure 3 is a circuit diagram of the distribution panel with neutral wire replacement function according to a preferred embodiment of the present invention.
4 is a configuration diagram of an embodiment of the imaging detector of FIG. 3.
5 is a circuit diagram of one embodiment of the neutral line protector of FIG.
Figure 6 is a flow chart showing a neutral wire replacement method of the overall distribution in accordance with a preferred embodiment of the present 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 having a neutral wire replacement function according to a preferred embodiment of the present invention, and is provided in a circuit breaker (MCCB) 10, 21, 22, a branch circuit, and each load (light, RECEP, It is composed of an earth leakage breaker (31, 32, 41, 42, 51, 52), the neutral conductor replacement device 200 to perform a blocking operation when the power supply to the broadcasting device power supply, etc.).

Here, the detailed operations of the breakers 10, 21, 22, and ground fault breakers 31, 32, 41, 42, 51, and 52 are the same as those of the general distribution board, and thus, detailed descriptions of the corresponding parts will be omitted. .

When the neutral wire replacement device 200 is supplied with power through a three-phase four-wire type (R, S, T, N), it detects phase loss of the supply power, and when the phase detection is detected, determines that the neutral wire is broken and replaces the neutral wire. It prevents the load connected to single-phase power from being burned out.

The neutral wire replacement device 200, and the phase detector 210 for detecting the phase of the power supplied to the distribution panel; A controller 220 which determines whether a neutral wire is disconnected from the phase detection value output by the phase detector 210 and generates a control signal for replacing the neutral wire when the wire is disconnected; It includes a neutral line protector 230 to replace the neutral line in accordance with the control signal generated by the controller 220 to maintain the balance of the phase voltage.

In this case, the controller 220 may store a controllable program, and may be implemented as a microcomputer, a microprocessor, a central processing unit, a microcontroller, or the like capable of controlling the overall operation of the neutral protection device according to the stored program.

As shown in FIG. 4, the imaging detector 210 includes: a phase detector 211 detecting a phase signal for each phase of input power; If the level of any one of the phases R, S, T detected by the phase detector 211 is maintained at a high level for a predetermined time or more includes an image determination determiner 212 to determine the phase and output an image detection detection value; It is preferable.

As shown in FIG. 5, the neutral protector 230 includes a switch M1 for connecting three phases R, S, and T; It is preferable to include the coil (L1 ~ L3) for maintaining the balance of the single-phase voltage by connecting the three-phase and the neutral neutral (N).

In addition, the neutral wire replacement device 200, it is preferable to further include an alarm generator 240 for alarming the disconnection of the neutral wire in accordance with the alarm generation control signal output by the controller 220.

In addition, the neutral conductor replacement device 200 generates an alarm release signal and transmits it to the controller 220 when an alarm release switch for alarm release is operated by an administrator after an alarm is generated by the alarm generator 240. It is preferable to further include an alarm release signal input unit (250). The signal input unit 250 is provided with an alarm release switch as is well known.

In addition, the neutral wire replacement device 200 is provided with a single-phase power breaker (M2) to automatically cut off the single-phase power supplied to the load if the alarm release request does not occur within a predetermined time after the alarm occurs.

Distribution panel with a neutral wire replacement function according to the present invention configured as described above, after the power supplied from the Korea Electric Power through the primary transformer, the three-phase four-wire power is supplied through the Y connection method.

At this time, when the neutral wire is disconnected, the voltage supplied to each phase is changed according to the capacity of the load, which causes the load device to be burned out due to an abnormal voltage (overvoltage) at the light load side.

In order to prevent such an accident in advance, in the present invention, the neutral wire replacement device 200 detects phase loss of the power supply at all times, detects the state of the neutral wire, and immediately detects the disconnection of the neutral wire and replaces it with another neutral wire at the same time. In addition, it compensates the voltage imbalance between phases and prevents overvoltage from flowing to the light load side.

In more detail, when power is supplied to the entire distribution, the imaging detector 210 operates to detect an image, and transmits an image detection value to the controller 220.

For example, the phase detector 211 of the phase detector 210 detects phase signals of R, S, and T phases of three-phase power input in real time, and is detected by the phase detector 211 at the phase determiner 212. It is confirmed whether the level of one phase of each phase signal of each phase is maintained for a predetermined time or more in order to determine an image formation at a high level, and as a result of this checking, any one phase may be maintained at a high level for a predetermined time or more. In this case, it is determined that the phase is missing, and the phase detection value is transmitted to the controller 220. Here, when the neutral wire is disconnected, any phase level becomes a high level.

Here, the imaging detection value outputs a high signal (5V) when an imaging is detected, and the imaging detection value outputs a low signal (0V) when no imaging is detected.

The controller 220 analyzes the imaging detection value provided from the imaging detector 210 by using a built-in control program, and when it is determined that the neutral wire is not disconnected, the controller 220 does not operate the neutral wire protector 230. In this case, the neutral line protector 230 is operated.

The neutral line protector 230 has a neutral line internally, and when an operation control signal is transmitted by the controller 220, the switch M1 operates to connect three phases R, S, and T. The replacement neutral wire (N) and the coil (L1 ~ L3) for each phase is connected. In other words, the replacement neutral wire (N) is replaced with the neutral wire disconnected by connecting the three phases to the replacement neutral wire when the neutral wire is disconnected in the state that is always present. Here, the neutral wire connection can be easily connected by using a magnet switch or the like.

When the neutral protector 230 operates to replace the disconnected neutral wire, the unbalance of single phase voltages that may be caused by the neutral wire disconnection may be maintained in the same state as before, and thus the neutral wire among the power lines supplied to the distribution board. Even if this is disconnected, the problem that the overload flows to the light load side of the load using the single-phase power as in the prior art will prevent the problem of burning the electric equipment.

Here, the present invention determines whether or not to disconnect the neutral wire, but in addition to such a method, in connection with the phase-protection apparatus and the controller 220 provided in the existing distribution boards in addition, it is automatically determined as a neutral wire disconnection when the phase-protection apparatus is operated. It is also possible to do this.

On the other hand, the controller 220 as soon as it is determined that the disconnection of the neutral wire will immediately drive the alarm generator 240. The alarm generator 240 operates to alert the disconnection of the neutral wire, in the present invention is to alarm by using a visual alarm and / or an audio alarm method.

If the administrator recognizes this in the presence of a visual or auditory alarm, he / she will follow up promptly, thereby preventing various accidents that may occur due to disconnection of the neutral line.

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 250 is operated, the alarm release signal input unit 250 generates an alarm release signal and transmits it to the controller 220.

When the alarm release signal is transmitted, the controller 220 stops the operation of the alarm generator 240 to release the alarm.

In addition, the present invention, after performing the alarm for the disconnection of the neutral wire, the power is automatically supplied to the load by controlling the single-phase power breaker (M2) in the controller 220 if the alarm is not requested within a predetermined predetermined time (single-phase power ) To prevent accidents that may occur due to neutral wire breakage.

6 is a flow chart showing a "neutral wire replacement method of a distribution panel" according to a preferred embodiment of the present invention, when power is supplied through a three-phase four-wire equation to detect the phase of the three-phase four-wire power supplied to the distribution panel Determining whether the wire is broken (S101 to S103); If it is determined that the neutral wire is disconnected, operating the neutral wire protector to replace the disconnected neutral wire (S105 to S109); Generating an alarm for neutral wire disconnection after replacing the neutral wire (S111); If an alarm releasing request is generated after the alarm is generated, releasing the generated alarm (S113 to S115); If the alarm release request does not occur within a certain time after the alarm occurs, the step of automatically cutting off the single-phase power supplied to the load (S117 ~ S119).

As shown in the figure, first, when power is supplied to the entire distribution in step S101, the imaging detector 210 detects whether or not an image is lost in step S103. In this case, the phase detection is detected in the same manner as the operation of the protective device when the neutral wire is blocked, so detailed description is omitted in order to avoid duplicated materials.

If an open phase is detected, it is determined that the neutral wire is disconnected (S105), and the neutral wire protector 230 is driven to replace the disconnected neutral wire (S107 to S109). For example, if a neutral wire is provided separately, and the neutral wire (N) of the power input terminal is disconnected, the neutral wire of the power supply device is replaced with the neutral wire provided separately, and the voltage is balanced for each phase to connect the single-phase power that may be generated from the neutral wire break. This will prevent damage to the device.

In addition, when it is determined that the neutral wire is disconnected, the alarm generator 240 is driven to generate an alarm for the neutral wire disconnection visually, and when the alarm generated by the administrator is requested to be released, the alarm generator 240 is driven. The alarm is stopped to release the generated alarm (S111 to S115).

That is, according to the present invention, if the phase is detected when the power supply is supplied to the distribution panel, it is judged to be a neutral wire disconnection, and automatically performs automatic switching to a preliminary neutral wire to prevent phase voltage unbalance caused by the neutral wire disconnection. It is to prevent the electrical equipment of the burn out. In addition, if a neutral wire break occurs, an alarm is generated immediately so that the manager can recognize it, and afterwards, the manager can quickly take follow-up actions, thereby preventing an accident such as a system failure that may occur later due to the wire break. will be.

In addition, the present invention checks the passage of time after alarming the disconnection of the neutral wire as in steps S117 to S119, and if the alarm release signal is not input by the administrator even after a predetermined time elapses, the load is automatically applied to the load. By cutting off the supplied single-phase power, the load device is prevented from being burned out.

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 wire replacement device
210... Imaging sensor
220 ... Controller
230... Neutral line protector
240... Alarm generator
250... Alarm release signal input section
M2... Single phase power breaker

Claims (6)

In the whole distribution,
A breaker (MCCB);
An earth leakage circuit breaker provided in each branch circuit and performing a breaking operation when an electric leakage occurs when supplying power passing through the breaker to the load;
Detecting the phase loss of the three-phase four-wire (R, S, T, N) supply power input through the circuit breaker, and if the phase detection is detected, it is determined to be a neutral wire disconnection and replaces the neutral wire and the load connected to the single phase power is burned out. Distribution board with neutral wire replacement function, characterized in that it comprises a neutral wire replacement device to prevent.
The method of claim 1, wherein the neutral wire replacement device,
An image detector for detecting an image of power supplied to the distribution board;
A controller for determining an open circuit by detecting the open phase by the open phase detector and generating a control signal for replacing the neutral line;
And a neutral wire protector for replacing the neutral wire according to a control signal generated by the controller to maintain a balance of the single-phase voltage.
The method of claim 2, wherein the imaging detector,
A phase detector for detecting phase signals of R, S, and T phases;
And a phase determination unit for determining a phase if the level of any one of the R, S, and T phases detected by the phase detector is maintained at a high level for a predetermined time or more.
The method according to claim 2, The neutral protective group,
A switch for connecting three phases (R, S, T);
Distribution board with a neutral wire replacement function characterized in that it comprises a coil for maintaining the equilibrium of the single-phase voltage by connecting the three-phase and the neutral neutral (N) for replacement.
The method of claim 2, wherein the neutral wire replacement device,
An alarm generator for alarming the disconnection of the neutral wire according to the alarm generation control signal output by the controller;
The neutral line substitute function is further provided, further comprising an alarm release signal input unit for generating an alarm release signal and transmitting the signal to the controller when an alarm release switch for an alarm release is operated by an administrator after an alarm is generated by the alarm generator. Distribution overall.
In the controller provided in the neutral wire replacement device for performing a protection operation during the disconnection of the neutral wire,
Detecting the disconnection of the neutral wire by detecting a phase loss of the 3-phase 4-wire power supplied to the distribution board;
If it is determined that the neutral wire is disconnected, operating the neutral wire protector to replace the disconnected neutral wire;
Generating an alarm for neutral wire disconnection after the neutral wire replacement;
Releasing the generated alarm if an alarm releasing request occurs after the alarm is generated;
And switching off the single-phase power supplied to the load automatically when the alarm releasing request does not occur within a predetermined time after the alarm is generated.
KR1020110007870A 2011-01-26 2011-01-26 Distrtibuting board cabinet panel with neutral line replacement and method thereof KR20120086557A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101441791B1 (en) * 2013-02-20 2014-09-17 김나운 recovery device and method off recovery for open-phase in the power transmission line
WO2020105844A1 (en) * 2018-11-19 2020-05-28 엘에스산전 주식회사 Earth leakage breaker and method for controlling earth leakage breaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101441791B1 (en) * 2013-02-20 2014-09-17 김나운 recovery device and method off recovery for open-phase in the power transmission line
WO2020105844A1 (en) * 2018-11-19 2020-05-28 엘에스산전 주식회사 Earth leakage breaker and method for controlling earth leakage breaker
US11456140B2 (en) 2018-11-19 2022-09-27 Ls Electric Co., Ltd. Earth leakage breaker and method for controlling earth leakage breaker

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