KR100524371B1 - Recloser for separating failure section from distribution line and method for operating the secloser, medium recording program for operating the method - Google Patents

Abstract

The present invention relates to a line opening and closing control apparatus and method, the line opening and closing control apparatus according to the present invention, the line opening and closing drive unit connected to the distribution line to perform the opening and closing operation of the distribution line, by measuring the current of the distribution line failure Fault current detection unit for detecting the generation of current, a communication module for performing wired or wireless communication with at least one switch or at least one other line opening and closing control device installed in the distribution line, and if the occurrence of the fault current is continuously detected, the A main control part for opening the distribution line and controlling the line opening / closing driving unit to close the distribution line again after a predetermined time; and even after the distribution line is closed again, the fault current detecting unit The main controller determines that it is closest to the point of failure In the opening and closing drive unit is characterized in that the control to keep the closed to said distribution line. According to the line open / close control device and method thereof, the line open / close control device communicates with at least one switch to identify the switch closest to the point of failure of the distribution line, and control the identified switch to open the line. By maintaining the closing of the line again, it is possible to minimize the power outage section of the distribution line in which the fault current is generated and to obtain the maximum soundness section.

Description

Line opening / closing control device and control method for separating fault section of distribution line, recording medium recording the program

The present invention relates to a control device and a method for opening and closing a line, more specifically, if it is determined that the line opening and closing control device that must handle the failure through the operation of the minimum distribution line opening and closing when a fault current is detected from the distribution line. Receiving fault current detection information from at least one switch, identifying the switch closest to the point of failure, controlling the identified switch to open the distribution line, and retaining the closure of the distribution line for quick and efficient The present invention relates to a line open / closed control device and a method for performing a distribution line failure section separation.

As is well known, a distribution line that supplies power from a substation to a customer is composed of complex trunks and branch lines, because unlike a transmission line, power is required to supply a large number of customers each. Therefore, if a ground fault (when the wire is broken and grounded) or a short circuit (when other wires are stuck) occurs on the distribution line and a fault current occurs, find the location of the fault point where the accident occurred. It takes a lot of effort.

Conventionally, when a fault current occurs in a distribution line, a substation breaker operates to find a fault point where a fault current has occurred, and the operator and the substation manager in the field mainly exchange information about the accident point using communication means. Finding faults has been a common practice. However, in the case of the above method, a lot of time and manpower is consumed, and as the recovery time is long, the power failure time is prolonged, which causes a lot of inconveniences for power consumers. Accordingly, there has been a demand for a method of improving the reliability of the power supply and the quality of service for the customer by shortening the power failure time by quickly identifying and restoring the location of the failure point in the event of an accident of the wiring line.

The power distribution method of our country is a three-phase four-wire multi-ground system, in case of a ground fault, the ground current flowing through the neutral wire may be greater than the short circuit current. In a typical substation system, a line automatic switchgear is installed at a branch point or a customer entrance with a load capacity of 4000 [kVA] or less. In case of a ground fault, the automatic line breaker cooperates with the circuit breaker of the substation and the recloser (RECLOSER), which is a line open / close control device installed in the distribution line, to quickly and accurately block or open only the fault section to prevent the expansion of the fault section. Minimize that damage.

As described above, when an error occurs in a distribution line and a fault current is sensed, a device for separating and blocking a fault point at which the fault current has occurred includes a breaker, a switch, a recloser. Hereinafter, the function will be outlined.

The circuit breaker (CB) may open or close the line when a very large fault current is detected from the distribution line. In addition, if necessary, the line can be opened and closed even in the normal current flow.

Unlike breakers, a load break switch (LBS) means a device that can open and close a line only when no current flows or a normal current flows, and cannot open or close a line when a fault current occurs. The switch may be provided with a kind of control unit called a Feeder Remote Terminal Unit (FRTU) for controlling its operation. In other words, FRTU is connected to the mechanical unit of the switchgear is a device for controlling the opening and closing of the line of the switchgear. However, FRTU does not control the mechanism by judging the opening and closing of the line through the switch, and can control the mechanism by receiving a command from the host (main control device) through the communication function.

Recloser is a special type of breaker that recloses the track. If a fault current is detected from the power distribution line and continues for a certain range, the recloser opens the line and closes the line again after a predetermined time. If the fault current is still detected after the line is closed, the recloser repeats the above line reclose process by a preset number of times, and after that, if the fault current continues, the line is completely opened and no further reclose operation is performed. . The line reclosing operation of such a recloser will be described in detail with reference to FIG. 1.

1 is a graph illustrating a current value measured during a line opening and closing operation of a recloser according to the related art.

In FIG. 1, when a normal current flows in a distribution line and a fault current that exceeds the fault current threshold value is detected as in section 1, the recloser opens the line after the time allotted in section 1 has elapsed.

When the recloser opens the track, no current flows in that section of the track, so current values are not measured as in section 2. After two hours have passed, the recloser closes the track again. If the fault current is still detected as in section 3 after the track is closed again, the recloser opens the track again after three sections have passed. The recloser repeats this re-closing process a certain number of times (7 times in Fig. 1) .If the fault current is detected continuously, the reclosing operation is no longer performed while the line is opened after 7 sections of time. Do not perform. The state after these eight sections is called lockout.

The fault current threshold may be variously set to an appropriate value according to the judgment of those skilled in the art. In addition, the time for the track closing section of section 1, section 3, section 5, and section 7 may be variously set according to a predetermined T-C curve (Time-Current Curve) graph widely used by those skilled in the art. The time for the line opening section of the second section, the fourth section, and the six section can be appropriately set by those skilled in the art in correspondence with the times of the first section, the third section, the five sections, and the seven sections.

The recloser can detect the occurrence of the fault current more accurately by repeating the opening and closing of the line as many times as described above. For example, when a branch or the like touches a distribution line, a fault current may be generated temporarily and then may be restored to a normal current. In this case, a typical breaker senses a fault current and immediately opens the line, resulting in a permanent power outage. However, the recloser can detect the fault current more accurately by detecting the normal current through the reclose operation after a certain number of times, that is, the opening of the line as described above.

In general, switchboards as well as reclosers are installed in various places on the distribution line. However, in the related art, since the recloser and the switchgear are operated independently without communicating with each other, it is not possible to accurately determine the location of the failure point when a fault current is generated. Therefore, since the reclosers that are located near the fault point and detect the fault current at least once are all kept open, a problem of unnecessarily extending the power failure section frequently occurs.

In accordance with the problems of the prior art as described above, there is a demand for the development of a line open / close control device that can quickly divide a distribution line failure section and secure a healthy section by using a communication function between a recloser and a switch.

The present invention has been made to improve the prior art as described above, the line opening and closing control device communicates with one or more switchgear to identify the switch closest to the failure point of the distribution line, the identified switch opening the line It is an object of the present invention to provide a line opening / closing control device and a method capable of ensuring a sound section of a distribution line in which a fault current is generated by maintaining the closing of the line.

In addition, the present invention is to determine whether or not the line opening and closing control device is the line opening and closing control device that must be located closest to the point of failure through the minimum line re-closure process to handle the failure of the line, more quickly the failure section It is an object of the present invention to provide a line open / closed control device and a method capable of performing the separation.

In addition, the present invention is to control the normally open line open and close control device to close the line in the section that does not receive power from the current source after the fault section is separated, the power from the other current source to the section It is an object of the present invention to provide a line opening and closing control apparatus and method capable of quickly restoring and minimizing the range of a power failure section when a fault current is generated.

In order to achieve the above object and solve the problems of the prior art, the line opening and closing control apparatus according to the present invention, the line opening and closing drive unit connected to the distribution line to perform the opening and closing operation of the distribution line, by measuring the current of the distribution line A fault current detection unit detecting a fault current generation, a communication module performing wired or wireless communication with at least one switch or at least one other line open / close control device installed in the distribution line, and when the occurrence of the fault current is continuously detected, A main control part for opening the distribution line and controlling the line opening / closing driving unit to close the distribution line again after a predetermined time; and even after the distribution line is closed again, the fault current detecting unit When detecting the occurrence of the current again, the main controller determines that it is closest to the point of failure. Characterized in that the track opening and closing drive unit for controlling to maintain a closed circuit of said distribution line.

In addition, the line opening and closing control method according to the present invention, the first step of detecting the fault current by measuring the current of the distribution line, if the detection of the fault current is continued, after the predetermined time after opening the distribution line (Open) Step 2 of closing the power distribution line (Close), step 3 of receiving and reading the fault current detection information from at least one switch located in the power distribution line, if the fault current is still detected after the closing of the power distribution line, the reading As a result, four steps of identifying the first switch, which is located at the potential of the fault point and located closest to the fault point, of the switch which detects the fault current, and the fault point of the switch which does not detect the fault current as a result of the reading. Step 5 identifying a second switch located at a rear of the vehicle and located closest to the fault point, and the first switch and the second switch 6 includes controlling to open the distribution line.

The line opening and closing control apparatus widely mentioned in the present specification may be installed on a distribution line so that power can be smoothly supplied to each region where customers are located in a distribution line for supplying power to a plurality of consumers from a power plant or a substation. . In general, in the event of a short circuit (connection of different phases) or ground fault (disconnection and grounding), the distribution line has a very large fault current compared to the normal current. do. When the fault current is detected from the distribution line as described above, the line open / close control device operates to prevent a large-scale blackout by blocking a section of the distribution line where the fault current occurs.

The line opening and closing control apparatus in the present specification may include both a recloser and a recloser controller for controlling the operation of the recloser. In addition, the line opening and closing control device is a switch (LBS: Load Break Switch), FRTU (Feeder Remote Terminal Unit), breaker (CB: Circuit Breaker) that can be installed in the distribution line, if the design is changed according to the needs of those skilled in the art It may be configured to include. That is, it may include all kinds of breakers for reclosing the distribution line, including the recloser. However, in the present specification, an example in which the line open / close control device is configured as a recloser and a recloser controller will be described.

In addition, the track opening and closing control apparatus according to the present invention can be applied to both the underground line opening and closing control device installed in the basement through the manhole, as well as the processing line opening and closing control device installed on the ground through the pole.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

2 is a view showing the overall system configuration of the processing distribution line is installed on the ground through the pole in accordance with an embodiment of the present invention.

According to FIG. 2, at least one electric pole 230, a line open / close control device 240, and a switch 250 may be installed in the distribution line. The customer 260 may receive power from the substation 210 through the distribution line. In addition, the main controller 220, the line opening and closing control device 240, and the switch 250 may perform wired and wireless communication with each other through a communication network. The main controller 220 is a server of an operator that manages an entire power generation and distribution system such as a distribution line or a transmission line, and may be, for example, a comprehensive situation room of KEPCO.

As shown in FIG. 2, the switch 250 may be configured to include a FRTU. That is, the switch 250 may communicate with the main control unit 220 using the communication function of the FRTU as well as the line opening and closing operation, and may also communicate with the line opening and closing control device 240. In addition, the switch 250 may operate to open the distribution line by receiving a command from the main controller 220 or the line open / close control unit 240 when a fault current is detected due to an accident in the distribution line. .

The line open / close control unit 240, the switch 250, or the main control unit 220 may communicate with each other through a communication network. The communication network may include both wired and wireless communication networks. For example, a telephone line and an optical communication network may be used as the wired communication network, and a trunked radio system (TRS), CDMA, or Air Media may be used as the wireless communication network. In addition, as a communication protocol in the communication network, a distribution automation protocol of DNP (Distribution Network Protocol) 3.0 or IEC 6185001 may be used.

The DNP 3.0 protocol is a standardized communication protocol developed to ensure compatibility between RTU-central controllers in the SCADA system, which is a centralized remote monitoring device used in the fields of power company, oil, gas and water resources. In particular, this protocol is excellent in stability and shows excellent performance in low-level communication environment, so it can be applied to SCADA environment better than the existing method, and because it is open standard, it is not a proprietary protocol belonging to a specific company. As a protocol, all privileges are owned by the user group. The IEEE recommends as a standard for message exchange between RTU and IED. In Korea, it is introduced or prepared by related companies such as KEPCO and Gas Corporation, and it is becoming an industry standard of many vendors around the world.

According to the present invention, when the DNP 3.0 protocol is applied to the communication method through the communication network as described above, in the communication between the line open / close control device 240 and the switch 250, the line open / close control device 240 is a DNP 3.0 protocol. A master function on the protocol may be performed, and the switch 250 may perform a slave function. That is, the line open / close control device 240 may control the line open / close operation of the switch 250 by performing communication in which the DNP 3.0 protocol is applied.

The line opening and closing control device 240 may be installed at one or more places in the distribution line. The configuration and operation of the line open / close control device 240 will be described in detail with reference to FIG. 3.

3 is a block diagram showing the configuration of a line open and close control apparatus according to an embodiment of the present invention.

The line open / close control device 300 shown in FIG. 3 may be implemented in a configuration including a recloser and a recloser controller. As an example, in FIG. 3, the line opening / closing driver 310 may correspond to the recloser, and the remaining components may correspond to the recloser controller.

The line open / close control device 300 according to an embodiment of the present invention includes a line open / close drive unit 310, a fault current detecting unit 320, a communication module 330, and a main control unit 340.

The line opening / closing driver 310 is connected to the distribution line 301 to perform the opening / closing operation of the distribution line 301. The line opening / closing driving unit 310 may perform the opening and closing operation of the distribution line 301 under the control of the main controller 340 when a fault current occurs, and not only when a fault current occurs, but also when necessary, According to the control, the opening and closing operation of the distribution line 301 may be performed. As shown in FIG. 3, the line opening / closing driving unit 310 may be included in the line opening and closing control device 300, or may be configured outside the line opening and closing control device 300, for example, an upper end of a pole. The opening and closing control device 300 may be installed in a separate configuration. In the present specification, for convenience, the line opening / closing driving unit 310 will be described with an example in which the line opening and closing control device 300 is configured together.

The fault current detecting unit 320 measures the current of the distribution line 301 to detect the occurrence of the fault current. The fault current detector 320 may measure the current by connecting the distribution line 301 and a predetermined ammeter. The current measurement may be performed at all times or may be repeated at predetermined time intervals. When the fault current is detected from the distribution line 301, the fault current detector 320 may notify the main controller 340 of the fault current. The fault current may be determined to occur when the current value is measured to a value larger than a predetermined fault current threshold value. The fault current threshold value may be determined as an appropriate value according to the judgment of those skilled in the art.

The communication module 330 performs wired / wireless communication with at least one switch or at least one other line open / close control device installed in the distribution line 301. The line open / close control device 300 receives fault current detection information from one or more switches through the communication module 330. The fault current detection information includes information on whether the switch detects a fault current from the distribution line 301.

The communication module 330 may perform communication using one or more other line open / close control devices and one or more switches and the DNP 3.0 protocol. In the DNP 3.0 protocol, the line open / close control device 300 may have a status of a master or a slave according to a communication counterpart, and the switch may have a status of a slave.

The communication module 330 may include a predetermined wired communication interface for connecting a wired telephone or an optical communication network, and may include an interface for wireless communication such as a trunked radio system (TRS), CDMA, and air media. In the present invention, the communication module 330 may generally communicate with the main controller using serial communication such as RS-232C, and may communicate with another external device through an optical communication network.

For the above operation, the communication module 330 may include any one or more of serial, universal serial bus (USB), infrared (IR) communication unit, Bluetooth communication unit, or mobile communication interface unit. In addition, the mobile communication interface unit may not only connect to a public switched telephone network (PSTN) but also one or more of a code division multiple access (CDMA), WCDMA, ALL IP, GSM, GPRS, and all existing mobile communication-related access methods. It may be supported, and may be implemented to support one or more of a call control protocol for VoIP call connection such as H.323, Message Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), or Megaco.

The main controller 340 opens the distribution line 301 by controlling the line opening / closing drive 310 when the failure current generation of the distribution line 301 is continuously detected through the failure current detecting unit 320. After a predetermined time, the distribution line 301 is closed again. In addition, the main control unit 340, when the fault current is continuously detected through the fault current detection unit 320 even after the distribution line 301 is closed again, the line opening and closing control device 300 is on the power distribution line 301 It is judged that it is a line open / closed control device located closest to the point of failure, which is the point of failure current.

However, if the fault current is not detected after the distribution line 301 is closed again, and the normal current is detected again, the main control unit 340 does not locate the closest to the fault point, so that the fault section of the line is separated. It is judged that it is not a line opening and closing device that should be In this case, the main control unit 340 may control the line opening and closing drive unit 310 so that the distribution line keeps closing.

However, when the line open / close control device 300 determines that the line open / close control device is located closest to the point of failure which is the point where the fault current is generated on the distribution line 301, the main control unit 340 communicates with the communication module 330. The fault current detection information received from at least one switch belonging to the jurisdiction of the line open / close control device 300 on the distribution line 301 is read to identify the switch associated with the fault point among the at least one switch.

The operation of the main controller 340 will be described in more detail with reference to FIGS. 1 and 7 mentioned in the related art.

1 is a diagram illustrating a current value measured according to the re-closing operation of the line open / close control device 300 when a fault current is detected from the distribution line 301.

FIG. 7 is a time-current curve graph illustrating a closing state holding time according to an input current.

In FIG. 1, time elapsed in a closed state such as 1, 3, 5, and 7 sections may be set by the time-current curve graph (hereinafter, T-C curve) of FIG. 7. The T-C curve is a graph showing the closing state time according to the magnitude of the current input current.

The time periods for maintaining the decommissioning sections of 1, 3, 5, and 7 may be determined according to the T-C curve, and the decommissioning retention time of each section may be determined according to different T-C curves.

In FIG. 7, graphs for four types of T-C curves, A, B, C, and D, are specified. In each graph, the X axis represents the measured current value against the fault current threshold value, and the Y axis represents the closing time accordingly.

Looking at the four T-C curves shown in FIG. 7, all of the time values derived for the fault current of the same magnitude may be different. That is, when a current of 200% is detected compared to the fault current threshold value, a time of 80 ms may be applied in the case of the A curve, and a time of 3 s may be applied in the case of the C curve.

That is, the line opening and closing control device 300 may operate faster than when the fault current is detected in the section where the A curve is applied, and may operate more slowly in the section where the C curve is applied. Therefore, the T-C curves can be largely divided into fast curves and delayed curves. For example, in the A, B, C, D curve, the A curve is a fast curve, B, C, D curve may be a delayed curve.

Different T-C curves may be applied to four sections 1, 3, 5, and 7 in FIG. 1. For example, it can be set in the form of 2F2D (2fast curve 2delayed curve), in this case, a fast curve such as curve A of FIG. 7 is applied to section 1 and section 3, and section 5 and section 7 You can apply a delayed curve, such as the C curve.

In the case described above, if a fault current is detected by applying a fast curve to sections 1 and 3, fast reclosing may be performed to determine whether the fault current is caused by a temporary cause such as tree branch rubbing. However, if the fault current is still detected after the interval, the delayed curve is applied in the 5th and 7th sections to determine whether the faulty current is caused by a permanent cause. Can be.

The line open / close control device 300 may start communication with the switch through the communication module 330 in five sections to which the delayed curve is applied. That is, in five sections, the line open / close control device 300 determines which switch is the switch closest to the point of failure by communicating with the peripheral switches managed by the user, and in six sections (the section in which the user opens the track again). The switch closest to the advantage controls to open the distribution line. Thereafter, the line opening and closing control device 300 may close the distribution line 301 again to detect a normal current instead of a fault current in the seven sections.

In other words, when the reclosing ends in the section to which the fast curve is applied and enters the section to which the delayed curve is applied, the communication process is performed with the switch that recognizes the switch closest to the point of failure. After the end of the section, the open command is sent to the switchgear that detects a fault current in the open state, and after confirming that the switchgear has opened the line, he may close the line again.

For example, when the TC curve is applied in the form of 2F2D or 1F3D, communication can be performed with the switch in 5 sections in 2F2D and 3 sections in 1F3D, and in 6 sections in 2F2D and 1F3D. In this case, the switch open command can be transmitted in four sections, and the result can be confirmed.

If the line open / close control device 300 is determined to be the breaker closest to the point of failure, the line open / close control device 300 may maintain the open state without the distribution line 301.

The fault point separation operation of the distribution line according to the main control unit 340 will be described in more detail with reference to FIG. 4.

4 is a diagram illustrating an entire network of a distribution line in which a fault current occurs according to an embodiment of the present invention.

According to FIG. 4, a first current source 400 for supplying power to a plurality of consumers is located at one end of a distribution line, and four line opening / closing control devices 411 to 414 and eight switches 421 to 421 are provided on the distribution line. 428 is located, and the second current source 440 may be located at the other end of the distribution line.

The line open / close control device shown in FIG. 4 is represented by R / C because it is implemented as a recloser, and the switch is made by G / S since a switch operated by a gas switch method is used. . In addition, the first current source 400 and the second current source 440 may be implemented including a substation or a power plant.

In FIG. 4, when an accident occurs in the distribution line section between the switch 3 423 and the switch 4 424, the line opening and closing control device located between the first current source 400 and the failure point 430 where the accident occurs. 1 411 and the line open / close control device 2 412 detect a fault current. That is, the circuit break control device between the fault point 430 and the first current source 400 may detect the fault current. However, the line open / close control device 3 413 which is not located between the fault point 430 and the first current source 400 cannot detect the fault current, which means that the line open / close control device 4 414 has a fault point. This is because it is located at the pick (load side) of.

The line open / close control device 1 411 and the line open / close control device 2 412 which detect the fault current perform a reclose operation of the line, which is located farthest from the first current source 400 according to a preset program. The line open / close control device 2 412 operates to open the line before the line open / close control device 1 411. Thereafter, since the track opening and closing control device 1 411 is to detect the normal current again as the line opening and closing control device 2 412 opens the line, the line opening and closing control device 1 411 maintains the closing of the line without performing the line opening and closing operation.

The line opening and closing control device 2 412 closes the line again after a predetermined time after opening the line. Since the failure point 430 is not recovered even after the closing of the line, the line opening and closing control device 2 412 detects a failure current again, so that the line opening and closing control device is located closest to the failure point 430. It can be recognized. As described above, the line open / close control device 2 412 may recognize that the line open / close control device needs to perform a line fault section separation by performing a line reclose operation with a minimum number of times. Accordingly, the line opening and closing control apparatus according to the present invention can separate the failure section more quickly.

After the recognition, the line opening and closing control device 2 (412) receives the fault current detection information from the switch 3 (423), switch 4 (424), switch 7 (427), and switch 8 (428) that they manage on the distribution line. Receive each. In FIG. 4, since the fault point 430 is located between the switch 3 423 and the switch 4 427, the line open / close control device 2 412 detects a fault current from the switch 3 423. Receive In addition, the switch 4 (424) receives the fault current detection information indicating that the fault current was not detected. This is the same as the reason why the line open / close control device 3 413 does not detect the fault current as described above. As a result of reading the received fault current detection information, the line open / close control device 2 412 determines that the fault point 430 is located in the line section of the switch 3 423 and the switch 4 424.

After determining the location of the fault point 430 as described above, the line opening and closing control device 2 (412) communicates with the switch 3 (423) and the switch 4 (424), the switch 3 (423) and switch 4 (424). Control to open the track. In addition, the line opening and closing control device 2 (412) after confirming that the separation of the failure section was successful through the opening of the switch 3 (423) and the switch 4 (424), he himself maintains the closing of the line to maintain the blackout section Minimize and secure the health section as much as possible. The line opening control of the switch 3 (423) and the switch 4 (424) has a master position with respect to the switch 3 (423) and the switch 4 (424) of the line opening and closing control device 2 (412) using the DNP 3.0 protocol. Can be performed.

In addition, the line open / close control device 3 (413) and the line open / close control device 4 (414) of which power supply from the first current source 400 is interrupted in accordance with the open lines of the switch 3 (423) and the switch 4 (424). The distribution line section may receive power from the second current source 440 again. In general, the trunk section of the distribution line is connected in a loop form through a normally open line opening and closing control device such as the line opening and closing control device 4 (414).

At this time, when the line open / close control device 4 (414) closes the line, the section in which the power supply is stopped through the second current source 440 may be supplied with power again. In this case, since the switch 4 424 has already opened the line, the fault current does not flow to the line open / close control device 3 413 even if the line open / close control device 4 414 closes the line. In order to resume the power supply, the line open / close control device 2 414 may control a line close by transmitting a line close command with a master status of the DNP 3.0 protocol to the line open / close control device 4 414.

As described above, the line opening and closing device of the present invention can minimize the power failure section and quickly recover when a fault current of the distribution line occurs. That is, by performing the line opening operation of the line opening and closing control device 1 (411) later than the line opening operation of the line opening and closing control device 2 (412), by preventing the unnecessary opening of the line opening and closing control device 1 (411), It is possible to prevent the occurrence of a power failure in the section between the unrelated line opening and closing control device 1 (411) and the line opening and closing control device 2 (412).

Further, by performing communication with the switch and controlling the line opening of the switch, by separating the section between the switch narrower than the section between the line opening and closing control device, it is possible to minimize the blackout section. That is, in FIG. 4, the switch opening and closing control device 2 412 does not open the track, but the switch 3 423 opens the track, so that the switch 7 427 and the switch 8 428 irrelevant to the failure section. It is possible to prevent the power from being supplied to the section.

Figure 5 is a flow chart showing the flow of the line opening and closing control method of the line opening and closing control apparatus according to an embodiment of the present invention.

According to FIG. 5, the line open / close control device measures current of the distribution line to detect whether a fault current is generated (step 511). If a fault current is not detected from the distribution line (step 512), the line opening / closing control device stably supplies power to the customer while maintaining the closing of the distribution line (step 513).

In step 512, when a fault current is detected from the distribution line, the line opening and closing control device opens the distribution line (step 514), and closes the distribution line again after a predetermined time. (Step 515). If the fault current is not detected from the distribution line and the normal current is detected after closing the distribution line in step 515, the line opening / closing control device maintains the closing of the distribution line and resumes supplying power to the customer. (Step 517).

However, if the fault current is still detected even after the closing of the distribution line in step 515, the line opening and closing control device fails from one or more switches located in the distribution line, that is, the switch under the control of the line opening and closing control device. The current sensed information is received and read (step 518).

The line open / closed control device is located at the potential of the fault point (section between the current source and the fault point) of the switch which transmits fault current detection information indicating that the fault current has been detected, and is closest to the fault point. Identify the first switch that is located (step 519). Further, among the switchgear which transmits fault current detection information indicating that the fault current has not been detected as a result of the reading, it is located at the rear of the fault point (section between the fault point and another current source) and is located closest to the fault point. Identify the second switch (step 520).

The line open / close control device determines that a fault point, which is the point at which the fault current occurs, exists in a section between the identified first switch and the second switch, and controls the first switch and the second switch to open the distribution line. (Step 521). After the first switch and the second switch open the distribution line, the line opening and closing control device confirms that the line section separation of the failure point has been successful, and maintains the closing of the line again. As a result, the line open / close control device can minimize the outage section more quickly and secure the health section as much as possible through the minimum fault section separation.

The line open / close control method of the line open / close control device according to the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer-readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

6 is an internal block diagram of a general-purpose computer device that can be employed to perform the method for controlling the opening and closing of the line according to the present invention.

Computer device 600 includes one or more processors 610 connected to a main memory including random access memory (RAM) 620 and read only memory (ROM) 630. The processor 610 may also be called a central processing unit (CPU). As is well known in the art, the ROM 630 serves to transfer data and instructions to the CPU unidirectionally, and the RAM 620 typically transfers data and instructions bidirectionally. Used to. RAM 620 and ROM 630 may include any suitable form of computer readable media. Mass storage 640 is bidirectionally coupled to processor 610 to provide additional data storage capability, and may be any of the computer readable recording media described above. The mass storage device 640 is used to store programs, data, and the like, and is a secondary memory device such as a hard disk which is generally slower than the main memory device. Certain mass storage devices such as CD ROM 660 may be used. The processor 610 may include one or more input / output interfaces such as a video monitor, trackball, mouse, keyboard, microphone, touchscreen display, card reader, magnetic or paper tape reader, voice or handwriting reader, joystick, or other known computer input / output device. 650 is connected. Finally, the processor 610 may be connected to a wired or wireless communication network through the network interface 670. Through this network connection, the procedure of the method described above can be performed. The apparatus and tools described above are well known to those skilled in the computer hardware and software arts.

The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention.

While specific embodiments of the present invention have been described so far, various modifications are possible without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by the equivalents of the claims.

According to the line open / close control device and method thereof, the line open / close control device communicates with at least one switch to identify the switch closest to the point of failure of the distribution line, and control the identified switch to open the line. By maintaining the closing of the line again, one can obtain the effect of ensuring the healthy section of the distribution line where the fault current has occurred.

Further, according to the line open / close control device and method thereof, whether the line open / close control device is a line open / close control device that must be located closest to the point of failure through a single line reclose process to deal with the fault. By judging, it is possible to obtain an effect of more quickly separating the failure sections.

In addition, according to the line open and close control device and method of the present invention, after the fault section is separated, the other current source through the normally open line open and close control unit in the section that does not receive power from the current source (Source) By supplying power from the device, an effect of minimizing the range of the blackout period can be obtained.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible. Accordingly, the spirit of the present invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

1 is a graph showing the flow of current measured during the line opening and closing operation of the recloser according to the prior art.

Figure 2 is a view showing the overall system configuration of the processing distribution line is installed on the ground through the pole in accordance with an embodiment of the present invention.

Figure 3 is a block diagram showing the configuration of the line opening and closing control apparatus according to an embodiment of the present invention.

4 is a diagram illustrating an entire network of a distribution line in which a fault current occurs in accordance with one embodiment of the present invention.

Figure 5 is a flow chart showing the flow of the line opening and closing control method of the line opening and closing control apparatus according to an embodiment of the present invention.

6 is an internal block diagram of a general-purpose computer device that may be employed to perform the method for controlling the opening and closing of the line according to the present invention.

FIG. 7 is a time-current curve graph illustrating a closing state holding time according to an input current.

<Explanation of symbols for main parts of the drawings>

300: line open and close control device 310: line open and close drive unit

320: fault current detection unit 330: communication module

340: main control unit 301: distribution line

Claims (12)

In the line opening and closing control device for controlling the opening and closing of the distribution line for wiring the current supplied from the current source to the customer, A line opening / closing driving unit connected to a distribution line to open and close the distribution line; A fault current sensing unit for measuring a current in the distribution line and detecting generation of a fault current; A communication module for receiving fault current detection information from at least one switch or at least one other line opening / closing control device installed in the distribution line; And When the occurrence of the fault current is continuously detected, the power supply line is opened to a second line open / close control device located closer than the line open / close control device from the current source, and the distribution line is opened after a predetermined time. Main control unit for controlling the line opening and closing driving unit so that the furnace is closed again Including, When the fault current detecting unit detects the occurrence of the fault current again even after the distribution line is closed again, the main control part determines that the line open / close control device is located closest to the fault point. A first switch of the switch which detects the fault current by reading fault current detection information received from the at least one switch and controls the circuit breaker driving unit to maintain the closing of the distribution line. Identifying, and identifying, among the switchgear not detecting the fault current, a second switch closest to the first switch to identify two switchboards associated with the fault point, wherein the identified two switchboards are connected to the distribution line. Line opening and closing control device, characterized in that for controlling to open. delete delete delete The method of claim 1, The at least one other line opening and closing control device includes a normally open line opening and closing control device connected to a second current source, wherein the line opening and closing control device is opened after the distribution line of the switch associated with the failure point is opened. A line open / close control device for controlling a line open / close control device to close the distribution line. The method of claim 1, And the communication module is configured to perform communication using at least one other line open / close control device and at least one switch and a distribution network protocol (DNP) 3.0 communication protocol. The method of claim 6, In the DNP 3.0 communication protocol, the line opening and closing control device and the switch is operated as a master (Master) and a slave (Slave), respectively. delete In the opening and closing control method for each distribution line of the line opening and closing control device for wiring the current supplied from the current source to the customer, 1 step of detecting a fault current by measuring the current of the distribution line; If the detection of the fault current continues, opening the distribution line and closing the distribution line after a predetermined time; Receiving and reading fault current detection information from at least one switch located in the distribution line, if the fault current is still detected after closing of the distribution line; Identifying a first switch, which is located at the potential of the point of failure and is located closest to the point of failure, of the switches that sense the fault current as a result of the reading; Identifying a second switch, which is located at the rear of the fault point and is located closest to the fault point, among the switches which have not detected the fault current as a result of the reading; And Step 6 of controlling the first switch and the second switch to open the distribution line Line opening and closing control method comprising a. The method of claim 9, After step 1, If the detection of the fault current does not continue and the normal current is detected again from the power distribution line, step 2-1 of maintaining the closure of the power distribution line The track opening and closing control method further comprising. The method of claim 9, In the step 3, when the occurrence of the fault current is detected again even after the distribution line is closed again, it is determined that the line opening and closing control device is closest to the failure point, and the closing of the distribution line of the line opening and closing control device is again performed. 7 steps to keep Line opening and closing control method comprising a. A computer-readable recording medium having recorded thereon a program for executing the method of claim 9.