KR20170093037A - Feeder remote terminal unit and controlling apparatus in distribution management system - Google Patents

Abstract

A control device in a distribution operation system according to an embodiment of the present invention includes a failure indicator communicating with a remote terminal device to notify that a fault current flows in an interval where the remote terminal device is located, and a transmission/reception module for receiving information on the fault current and information on a time when the fault current is generated; and a processor which calculates a fault distance based on the information on the fault current, determines at least one fault candidate location based on it, and decides one among at least one fault candidate locations by referring to at least one of the fault indicator and a time when the fault indicator was generated. It is possible to accurately detect a fault section.

Description

TECHNICAL FIELD [0001] The present invention relates to a remote terminal apparatus and a control apparatus in a distribution operation system,

More particularly, the present invention relates to a remote terminal apparatus, a control apparatus, and a control method thereof in a distribution operation system, and more specifically, a more accurate fault region is detected by detecting a fault position in consideration of a fault indicator, a fault distance, And more particularly, to a remote terminal apparatus, a control apparatus, and a control method thereof in a distribution operation system that provides an improved failure detection method.

The distribution operation system is a system for improving the stability of the power system by establishing a reliable power distribution system and a power transmission system to provide stable power supply. In distribution operation system, it is important to prevent breakdown due to unexpected accident such as short circuit or ground fault, to detect fault section in case of an accident and to take quick follow-up action.

The failure detection method in the distribution operation system mainly generates a fault indicator (FI) which is information indicating whether or not the fault current is experienced in a remote terminal device called a Feeder Remote Terminal Unit (FRTU) and judges a fault section based on FI Algorithm. In addition, the distribution operation system also uses a method of determining the fault section using the variation of the fault current magnitude per section.

1 is a diagram for explaining a fault section detection method using an existing fault indicator.

In the case of a distribution line, a unidirectional current flows from the substation 110 to the loads 131, 132, and 133 due to the distribution system characteristic of a radial structure as shown in FIG. Depending on the time and location, the load current will flow to the power distribution line at such an extent that the effective value does not exceed approximately 250 amperes.

However, when an accident occurs due to various causes such as a short circuit or a ground fault, the impedance is sharply reduced due to a short circuit between the phase wires constituting the three phases or between the phase wire and the neutral wire. Accordingly, a fault current of several hundred to several thousand amperes . These fault currents flow from the substation 110 on the power source side to the distribution line via the power line 120 and return to the substation through the medium line so that power terminals A, B, C, and D of the high- And a fault current does not flow to the lower end E of the high-resistance 120. [

Accordingly, the remote terminal devices are installed at a predetermined interval in the distribution line, and when the remote terminal device detects that a fault current exceeding a predetermined value flows, a fault indicator is generated and transmitted to the control device. In this case, in an upper operating system such as a control device, it is possible to obtain a failure indication from the remote terminal device and judge that a failure has occurred between the position of the remote terminal device which transmitted the failure indication and the position of the remote terminal device which has not transmitted the failure indication In FIG. 1, remote terminal devices are located corresponding to A, B, C, D and E, respectively. In this case, a failure indicator is generated in the remote terminal devices located at A, B, C, and D, and is transmitted to the control device. In the remote terminal device located at E, a failure indicator is not generated. Thereby, the control device can determine that a failure has occurred between D and E.

Such a fault zone determination method basically starts from the assumption that the information of the remote terminal devices normally arrives within a limited time, and as the time passes, information is not generated in the system installed in the field due to aging of the remote terminal devices, Errors may occur. However, during the operation of the system, there is no basis or method to make an error judgment on the fault information uploaded from the remote terminal device in case of an accident.

In case of normal operation, most of the information uploaded from the remote terminal device does not have any problem, and if the information is not normally transmitted, it can be handled through an alarm. However, even if the remote terminal devices experiencing fault currents of several thousand amperes in the event of an accident include the grounding function, there are cases where normal information can not be transmitted due to deterioration of the remote terminal device or various variables in the field. In this case, the FI may not occur due to the occurrence of an accident, the fault current may not be transmitted normally, and this information may be generated in an area not related to the accident. Therefore, there is a lot of difficulty for the operator of the power distribution system to determine the fault zone in case of an accident.

Further, information may not be generated suddenly or incorrect information may be generated due to damage of the remote terminal device due to the fault current or communication failure or device error due to the field situation. Therefore, operators are not entirely trustworthy even if FI occurs.

The present invention provides a remote terminal apparatus, a control apparatus, and a control method thereof in a distribution operation system capable of detecting a fault location by detecting a fault location in consideration of a fault indicator, a fault distance, and a generation point of the fault indicator .

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. It can be understood.

A remote terminal apparatus in a distribution operation system according to an embodiment of the present invention includes a fault current flowing in a section where the remote terminal apparatus is located among a plurality of sections included in a power distribution line, A measurement unit for measuring a time at which the failure indicator is generated; A communication unit for transmitting the failure indicator, information on a time at which the failure indicator is generated, and information on the failure current to the control device; And generating a fault indicator by determining that the fault current flows in a corresponding section when a current flowing in a section in which the remote terminal apparatus is located is in a predetermined range or more and detecting the fault indicator and the fault indicator measured by the measuring section And a control unit for controlling the communication unit to transmit information on the generated time and information on the fault current to the control device.

The control device in the distribution operation system according to an embodiment of the present invention may further include a failure indicator communicating with the remote terminal device to notify that a fault current flows in a section where the remote terminal device is located, A transmission / reception module for receiving information on the time and the information about the fault current; And determining at least one failure candidate position based on the failure distance based on the information on the failure current and referring to at least one of the failure indicator and information on the time at which the failure indicator was generated, And a processor for determining a fault location among the one fault candidate location.

According to the embodiments of the present invention, the verification of the failure of the failure indicator is improved by the calculation of the failure distance, and the failure locations on the plurality of branch lines caused by the calculation result at the time of the failure distance estimation, The generation time point of the failure indicator can be determined from the time stamp generated in the indicator, thereby improving the reliability of the failure detection in the distribution operation system.

Accordingly, even if an error occurs in the remote terminal apparatus, the reliability of the fault section can be improved, and the operator can more quickly cope with the fault in the power distribution system accident by improving the system operation efficiency based on the reliable fault location detection.

1 is a diagram for explaining a fault section detection method using an existing fault indicator.
2 is a diagram illustrating a configuration of a distribution operation system according to an embodiment of the present invention.
3 is a block diagram illustrating a configuration of a remote terminal apparatus in a distribution operation system according to an embodiment of the present invention.
4 is a block diagram illustrating a configuration of a control apparatus in a distribution operation system according to an embodiment of the present invention.
5 is a view for explaining a fault section detection method according to an embodiment of the present invention.
6 is a diagram for explaining a fault section detection method according to an embodiment of the present invention.
7 is a diagram illustrating a process of detecting a fault section according to an embodiment of the present invention.
FIG. 8 is a flowchart illustrating a fault section detection process according to an embodiment of the present invention. Referring to FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the technical spirit of the present invention is not limited by the embodiments described below, and other degenerative inventions such as addition, change and deletion of another constituent element and other embodiments included in the technical idea of the present invention Examples can be easily suggested.

The terms used in the present invention are selected as general terms that are widely used in connection with the present technology as much as possible. However, in some cases, there are some terms selected arbitrarily by the applicant. Therefore, it should be understood in advance that the present invention should be grasped as a meaning of a term that is not a name of a simple term. In the following description, the word 'comprising' does not exclude the presence of other elements or steps than those listed.

2 is a diagram illustrating a configuration of a distribution operation system according to an embodiment of the present invention.

A distribution management system (DMS) 200 according to an embodiment of the present invention prevents a failure due to an unexpected accident such as a short circuit or a ground fault and detects a fault section in the event of an accident Rapid follow-up measures can be taken to ensure that the effects of accidents do not spread to the power grid.

To this end, the distribution operation system 200 may include a control device 210, a plurality of protection devices 220, and a plurality of remote terminal devices 300.

The control device 210 may control the distribution operation system 200 and the subsystems and components of the distribution operation system 200 as a whole. Specifically, the controller 210 transmits the power generated by the power plant through the transmission system, lowers the transmitted high-voltage power to an appropriate level in the substation, and distributes the power having an appropriate level of voltage to the user Can supply.

In addition, the controller 210 detects a fault section occurring in a distribution line included in or connected to the distribution operation system 200, and detects that the influence due to the failure is not transmitted to the power system through the distribution line The plurality of protection devices 220 can be selectively operated based on the failure period.

In order to detect a fault section, the controller 210 may receive a fault indicator (FI) from a plurality of remote terminal apparatuses 300, which will be described later. When a failure indicator is received, the control device 210 displays a message indicating that a failure has occurred in the remote terminal device 300 on the screen for remote control, generates an alarm by an alarm or the like, The lamp corresponding to the remote terminal apparatus 300 may be blinked.

The control device 210 selectively transmits a control command to the plurality of remote terminal devices 300 or opens a plurality of protection devices 220 to minimize an accident by opening a distribution line of an accident point And can be selectively operated.

The control device 210 may be, for example, a power system operator.

The protection device 220 may be a device for protecting the distribution line from a fault current. The protection device 220 is a circuit breaker (CB) that cuts off or stops the flow of current when an overcurrent flows through the distribution line, blocks the current flow for a short time when an instantaneous overcurrent flows through the distribution line, A switch for connecting or disconnecting the distribution line, and a protection relay for performing a circuit-to-circuit insulation operation to the distribution line, and the like.

A remote terminal unit (FRTU) 300 is installed in the distribution line. In this case, the remote terminal device 300 measures the current, voltage, and power flowing through the power distribution line at all times, detects a load current in the power distribution line, and senses a state of the load current and transmits the load current to the control device 210. Specifically, the remote terminal apparatus 300 may generate a failure indicator indicating that a fault current flows, and transmit the failure indicator to the control apparatus 210.

In addition, the remote terminal device 300 may store all the events generated on the distribution line and provide the control device 210 with an analysis of the cause of the accident.

The control device 210, the plurality of protection devices 220 and the plurality of remote terminal devices 300 are connected to the distribution line and are connected to a remote terminal device such as a master station and an RTU (Remote Terminal Unit) (DNP protocol) defined for communication with an electronic device (IED).

3 is a block diagram illustrating a configuration of a remote terminal apparatus in a distribution operation system according to an embodiment of the present invention.

The remote terminal apparatus 300 in the distribution operation system 200 according to an embodiment of the present invention may be a Feeder Remote Terminal Unit (FRTU).

The remote terminal apparatus 300 may include a measuring unit 310, a communication unit 320, and a control unit 330.

The measuring unit 310 can measure the time at which the fault indicator that indicates the fault current flowing in the section where the remote terminal apparatus 300 is located and the fault current that flows in the section are generated in a plurality of sections included in the power distribution line have.

For this purpose, the measuring unit 310 may include an amperemeter (not shown), which measures the current value of the direct current or the alternating current, and a timer for measuring the time. The ammeter may be located at an input terminal through which current flows into the remote terminal device 300 or may be located at an output terminal through which the current is outputted from the remote terminal device 300.

The communication unit 320 may transmit the failure indicator, information on the time at which the failure indicator was generated, and information on the failure current to the controller 210. [

The information on the fault current may include at least one of a voltage value of the fault current, a current value of the fault current, and a line impedance value to the power distribution line.

Meanwhile, the communication unit 320 can perform communication with the control device 210 according to the DNP protocol.

The control unit 330 determines that the fault current flows in the corresponding section when the current flowing in the section in which the remote terminal apparatus 300 is located is in the predetermined range or more and generates the fault indicator. In this case, the control unit 330 controls the communication unit 310 to transmit information on the time at which the failure indicator measured by the measurement unit 310 is generated, and information on the failure current to the control device 210 (320).

4 is a block diagram illustrating a configuration of a control apparatus in a distribution operation system according to an embodiment of the present invention.

The control unit 210 in the distribution operation system according to an embodiment of the present invention detects a fault section occurring in the distribution line and detects a failure section detected so that the influence of the failure does not spread to the power system through the distribution line. The plurality of protection devices 220 can be selectively operated.

To this end, the control device 210 may include a transmission / reception module 212 and a processor 214.

The transmission / reception module 212 communicates with the remote terminal device 300 to detect a failure indicator indicating that a fault current flows in an interval where the remote terminal device 300 is located, information on the time when the failure indicator is generated, Information about the current can be received.

In this case, the transmission / reception module 212 can perform communication using the DNP protocol with the remote terminal device 300.

The processor 214 may calculate the fault distance based on information about the fault current and determine at least one fault candidate location based thereon. If at least one failure candidate location is determined, the processor 214 may determine at least one failure location among the at least one failure candidate location by referring to at least one of the failure indicator and information on the time at which the failure indicator was generated.

Here, the information on the fault current may include at least one of a voltage value of a fault current, a current value of a fault current, and a line impedance value to a power distribution line.

The processor 214 may verify the validity of the failure indicator by referring to information on the time at which the failure indicator was generated.

Specifically, the processor 214 compares information on the time when the fixed indicator is generated and information on the time when the fixed indicator is received, and determines whether the fixed indicator is received within a predetermined range of time.

If it is determined that the failure indicator has been received within a predetermined range of time, the processor 214 determines that the corresponding fixing indicator is valid and uses it to detect the failure location.

However, if it is determined that the failure indicator has not been received within a predetermined range of time, the processor 214 requests the remote terminal 300 that has transmitted the failure indication to re-request the failure indicator, ) Can be confirmed.

According to one embodiment, the processor 214 compares the first failure candidate position determined based on the failure indicator with the second failure candidate position determined based on the failure distance, and if the two candidate positions are judged to be the same, It is possible to determine the position as the failure position.

If it is determined that the first failure candidate position determined based on the failure indicator is different from the second failure candidate position determined based on the failure distance, the processor 214 determines that the error has occurred in the remote terminal device 300 Can be determined to have occurred.

In this case, the processor 214 may request the at least one remote terminal 300 that has transmitted the failure indication to request at least one of information on the time at which the failure indicator was generated, information on the failure current, 212, and can determine the failure position based on the received information.

5 is a view for explaining a fault section detection method according to an embodiment of the present invention.

According to the fault section detection method according to an embodiment of the present invention, the fault section can be detected using the fault distance and the fault indicator.

The fault zone can be detected by calculating the fault distance. The method of calculating the fault distance is a method of calculating the fault location by the magnitude of the fault current with the information of the relay of the substation leading end and the fixed data such as the line impedance when an accident occurs. The failure distance is obtained by the following equation (1).

Here, V is the breakdown voltage (V), I is the fault current (A), Z _l is the line impedance (Ω / km), d represents a fault distance (km). Fault voltage, fault current, and line impedance can be data on the fault current measured at the substation dropout. According to the embodiment, data regarding such a fault current may be measured by the remote terminal apparatus 300. [

In this case, the controller 210 can calculate the failure distance according to Equation (1) based on the data on the failure voltage, the failure current, and the line impedance. When the failure distance is calculated, the controller 210 determines that a failure has occurred at a position distant from the current substation by a failure distance.

In this way, the fault location can be estimated using the fault distance calculation. However, because of the structural characteristics of the radially arranged distribution lines, there may be various branch lines within the calculated fault distance, so that there are many fault candidate locations even if the fault distance is calculated.

In FIG. 5, both X and Y and Z are spaced the same distance from the substation 110. Therefore, even when the actual failure occurs at Z 520, the controller 210 determines both X, Y, and Z as the failure candidate position by calculating the failure distance. Therefore, it is difficult to detect the actual failure position only by the failure distance, and in this case, the accuracy of the failure position is also lowered.

In addition, the electrical resistance may not be able to predict the fault resistance, and usually unbalance occurs between the three phases. If the line impedance information for the single phase load is insufficient, the distance error may be several tens of meters there is a problem. Furthermore, when the previously recorded information arrives delayed, a failure indicator is generated even after the failure processing, and it is difficult to accurately detect the failure section.

Therefore, according to the present embodiment, the failure position is detected using the failure distance and the failure indicator. First, the control device 210 calculates the failure distance. The fault distance can be calculated by Equation (1) based on the data relating to the fault current measured at the substation outgoing end as described above with reference to Fig. Specifically, when an accident occurs in the power distribution system, the relay of the substation outgoing end trips for the protection operation, and the fault current information transmitted from the protection device 220 and the fault current information transmitted from the distribution operation system 200 The fault distance is calculated based on the line impedance and positive information stored in the database. Here, the positive term means the horizontal distance of the designated section of the electric line.

Once the fault distance is calculated, the controller 210 determines a plurality of fault candidate locations based on the calculated fault distance.

Thereafter, the control device 210 selects a branch line in which a failure indicator among various branch lines is displayed within the calculated failure distance. In FIG. 5, since a failure indicator is displayed in A, B, C, and D, a branch line in which the corresponding sections are displayed is selected. The control device 210 can determine that a failure has occurred in the failure candidate position Z (520) located on the selected branch line.

As described above, according to the present embodiment, it is possible to detect a more reliable and accurate failure position by considering both the failure distance and the failure indicator.

6 is a diagram for explaining a fault section detection method according to an embodiment of the present invention.

According to the fault section detection method according to an embodiment of the present invention, the fault section can be detected using the time stamp for the time at which the fault indicator is generated as well as the fault distance and the fault indicator.

The resistance of the fault current varies depending on the incident, and is generally calculated assuming 0 to 30 ohms. However, when calculating the fault distance, the above-mentioned problem is a major factor causing an error with the actual fault distance . In addition, even if the fault distance is calculated with the fault current information measured at the substation withdrawal terminal, many fault location candidates may appear because there are many branch lines in the distribution line. Therefore, the fault location can not be detected completely depending on the fault distance.

In order to compensate for this, in the embodiment described with reference to FIG. 5, failure indicators as well as fault distances are considered together. When considering the failure indicator, the control device 210 basically assumes that the failure indicator arrives from the remote terminal devices 300 within a normally limited time. However, even if a previously generated failure indicator arrives due to a communication problem between the control device 210 and the remote terminal device 300, and a failure indicator is generated after the failure of the remote terminal device 300 is processed do.

To prevent this problem. In the past, when receiving the failure indicator from the remote terminal device 300, it is determined whether or not the failure indicator is erroneous based on the time when the failure indicator is received. However, since this is not a time stamp generated by the remote terminal apparatus 300, there is an error from the time when a substantial failure indicator is generated. Therefore, information in which time synchronization is severely disturbed due to communication delay or the like can be delayed and received, thereby causing a problem in accurate determination of a fault location after an accident process or in a temporary accident.

That is, the time when the existing measurement information is generated is not the time when the remote terminal 300 has time synchronization but the time when the data transmitted by the remote terminal 300 arrives at an upper operating server such as the controller 210 Most of them were stored based on time.

Therefore, in the present embodiment, when the remote terminal device 300 generates a failure indicator, the time stamp for the time at which the failure indicator is generated is tagged to the failure indicator, and the failure indicator tagged with the generated time is controlled To the device 210. In this case, the controller 210 can detect the fault section using the time stamp for the time at which the fault indicator is generated, as well as the fault distance and the fault indicator.

In FIG. 6, both X and Y and Z are spaced the same distance from the substation 110. Therefore, even if the actual failure occurs at Z (620), the controller 210 determines both X, Y, and Z as the failure candidate position by calculating the failure distance. In this case, it is impossible for the control apparatus 210 to detect the actual failure position only by calculating the failure distance, and further consideration should be given to the failure indicator information.

On the other hand, in the case of D, although the original failure indicator should have been generated and transmitted to the controller 210, the controller 210 did not receive the failure indicator due to a communication error, data loss, or the like. As a result, the control device 210 can not determine which of the Y and Z the failure has occurred.

In this case, the control device 210 requests the remote terminal devices 300 located at Y and Z, respectively, for information on the failure indication, and confirms the state of the remote terminal device 300. Since the failure occurrence position of the distribution line may change with time, a failure occurs at the Z position originally, but a failure may occur at the Y position when the failure indication is requested again. However, the controller 210 can determine the time at which the actual failure indicator was generated from the time stamp tagged to the failure indicator, and determine the correct failure location from the time.

As described above, according to the present embodiment, a more accurate fault section can be detected using the time stamp for the time at which the fault indicator is generated, as well as the fault distance and the fault indicator.

7 is a diagram illustrating a process of detecting a fault section according to an embodiment of the present invention.

The control device 210 operates the protection device 220 (S701).

In the event of an accident in the distribution system, the relay at the substation outlet can stop for protection operation. In this case, the protection device 220 can transmit information on the fault current to the control device 210. [ The information on the fault current may include a fault voltage and a fault current.

The control device 210 receives information on the fault current from the protection device 220 (S702).

The control device 210 judges the positive information (S703). Here, the positive information means a horizontal distance of a designated section of the electric line, and may be stored in the database of the distribution operation system 200. The control device 210 also determines the line impedance information. The line impedance information may also be stored in the database of the distribution operation system 200.

The control device 210 determines the failure candidate position (S704).

Specifically, the control device 210 calculates the failure distance based on the information on the failure current, the line impedance and the positive information, and determines the failure candidate position from the calculated failure distance. Due to the nature of the radially arranged distribution lines, there may be various branch lines within the calculated fault distance, so that even if the fault distance is calculated, there can be multiple fault candidate locations.

The control device 210 determines whether the fault candidate position is one (S705).

If the failure candidate position is one (S705-Yes), the control device 210 determines the failure candidate position as the failure position (S706).

On the other hand, if there is not one failure candidate position (S705-No), that is, if there are a plurality of failure candidate positions, the controller 210 determines a failure position among the failure candidate positions based on the failure indicator (S707).

The control device 210 selects the branch line where the failure indicator among the various branch lines is generated and transmitted within the calculated failure distance. Thereafter, the control device 210 can determine that the position at the farthest end from the power source side among the positions where the failure indicator is transmitted is the failure position.

FIG. 8 is a flowchart illustrating a fault section detection process according to an embodiment of the present invention. Referring to FIG.

The control device 210 receives a failure indication from the remote terminal device 300 (S801).

The failure indicator may be tagged with a time stamp for the time at which the remote terminal device 300 generated the failure indicator. From the time stamp tagged to the fault indicator, the control device 210 can determine the actual time at which the fault indicator was generated.

The control device 210 confirms the time at which the failure indicator is received (S802).

The control device 210 determines whether the failure indicator is received within a normal time range (S803).

A normal time range for receiving the failure indicator is set in the control device 210. [ For example, the failure indicator can normally reach the control device 210 within 5 seconds from the point in time at which it is generated. In this case, the time range for receiving the failure indicator is set to 5 seconds, and the controller 210 determines that the failure indicator that has exceeded 5 seconds or has not reached within 5 seconds is erroneous information.

Accordingly, when receiving the failure indicator, the control device 210 compares the time when the failure indicator is received with the time stamp included in the failure indicator, verifies whether the failure indicator is received within the normal time range, and verifies the validity of the failure indicator .

If it is determined that the failure indicator is received within the normal time range (S803-Yes), the control device 210 determines that the failure indicator is a valid failure indicator (S804). If it is determined to be a valid failure indicator, the failure indicator can be used for determining the failure position.

On the other hand, if it is determined that the failure indicator has not been received within the normal time range (S803-No), the control device 210 determines the failure indicator as an effective failure indicator. Since it has not been received within the normal time range, the corresponding fault indicator may be that the previously generated fault indicator has been received in a delayed manner, or that the fault indicator has been erroneously generated. Therefore, the control device 210 does not use the failure indicator for determining the failure position. In this case, the control device 210 checks the status of the remote terminal device 300 and requests a failure indicator again (S805).

The control device 210 determines the first failure position candidate based on the failure indicator (S806).

6, the fault current flows from the substation 110, which is the power source side, to the substation 110 through the power line Z, through the high-strength line 620, and then to the substation 110, A large current flows only to the power supply terminals A, B, C, and D of the power supply 620 and a fault current does not flow to the negative terminal E of the high power supply 620. [ From this characteristic, the control device 210 can determine the point where the fault indicator transmitted from the power source side at the end of the fault indicator transmitted to the control device 210 is generated as the fault location candidate. Also, when the failure indicator is in the middle, the control device 210 can determine that an error has occurred in the remote terminal device 300.

The control device 210 calculates the fault distance based on the information on the fault current (S807). The fault distance can be calculated by Equation (1) based on the data relating to the fault current measured at the substation outgoing end as described above with reference to Fig. Alternatively, data regarding the fault current according to the embodiment may be measured by the remote terminal device 300 and received from the remote terminal device 300.

The control device 210 determines a second failure position candidate based on the failure distance (S808).

Since the distribution line is arranged radially, there may be various branch lines within the calculated fault distance, so there may be a plurality of second fault location candidates as the case may be. In this case, the controller 210 can additionally refer to the previously determined failure indicator to determine one failure location candidate.

The control device 210 determines whether the first fault location candidate and the second fault location candidate are the same (S809).

If it is determined that the first fault location candidate and the second fault location candidate are identical (S809-Yes), the control device 210 determines the fault location candidate as the fault location (S810). That is, when the fault location candidates using the fault indicator and the fault location candidates estimated through the fault distance calculation show the same position, the controller 210 determines the corresponding location as a reliable fault location.

On the other hand, if the first fault location candidate and the second fault location candidate are not the same (S809-No), the control device 210 determines that the remote terminal device 300 is faulty (S811). That is, when the fault location candidate estimated by the fault indicator differs from the fault location candidate estimated through the calculation of the fault distance, the controller 210 determines that an error has occurred in the remote terminal apparatus 300. In this case, the control device 210 requests the remote terminal device 300 suspected of occurrence of an error again for a failure indication and confirms the status of the remote terminal device 300. The control device 210 can again determine the actual failure location based on the status of the remote terminal device 300 and the failure indicator received by the re-request.

A delay indicator or information may be delayed due to a communication error or data loss due to a traffic load. The generation time of the failure indicator is based on the time when the failure indication is received from the upper operation server due to the time synchronization problem. However, in this case, there is a serious error in the time synchronization, which may interfere with the operation due to the transmission delay and the like. Therefore, polling is delayed until all information is received. Further, in the past, the accuracy of the detection of the fault section is higher as the system deteriorates, and the time when the fault indicator is generated can not be known. Therefore, if an error occurs in the remote terminal apparatus, .

According to the present embodiment, by utilizing the generation time and the failure distance of the failure indicator tagged by the remote terminal apparatus 300 when the failure position is detected using the failure indicator and the failure position is determined, For the fault locations on the multiple branch lines caused by the calculation results in the fault distance estimation, it is necessary to determine the generation time of the fault indicator from the fault indicator and the time stamp generated in the fault indicator do. This makes it possible to improve the reliability of the failure detection in the distribution operation system.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various variations and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

110: Substation 131, 132, 133: Load
200: distribution operation system 210: control device
212: Transmitting / receiving module 214: Processor
220: Protective device 300: Remote terminal device
310: measuring unit 320: communication unit
330:

Claims (7)

A remote terminal apparatus in a distribution operation system,
A measuring unit for measuring a fault current flowing in a section where the remote terminal device is located among a plurality of sections included in the power distribution line and a time at which a fault indicator indicating that a fault current flows in the section is generated;
A communication unit for transmitting the failure indicator, information on a time at which the failure indicator is generated, and information on the failure current to the control device; And
When the current flowing in a section in which the remote terminal device is located is equal to or greater than a predetermined range, it is determined that the fault current flows in the corresponding section to generate the fault indicator, and the fault indicator and the fault indicator measured by the measuring section And a control unit for controlling the communication unit to transmit information on the time and the failure current to the control device. A control device in a distribution operation system,
A transmission / reception module for communicating with the remote terminal device and receiving a fault indicator indicating that a fault current flows in an interval where the remote terminal device is located, information on a time when the fault indicator is generated, and information on the fault current; And
Calculating at least one fault candidate location based on information on the fault current based on the information on the fault current and referring to at least one of information about the time at which the fault indicator and the fault indicator were generated, And a processor for determining a fault location among the fault candidate locations of the processor. 3. The method of claim 2,
Wherein if the failure indicator is determined not to have been received within a predetermined range of time based on the information on the time at which the failure indicator is generated, the processor may cause the remote terminal device And performs at least one of a request or a status check of the remote terminal device. 3. The method of claim 2,
The processor comprising:
And judges the position as the failure position when it is determined that the first failure candidate position determined based on the failure indicator is the same as the second failure candidate position determined based on the failure distance. 3. The method of claim 2,
The processor comprising:
When it is determined that the first failure candidate position determined based on the failure indicator is different from the second failure candidate position determined based on the failure distance, it is determined that an error has occurred in the remote terminal apparatus that has transmitted the failure indicator Control device. 6. The method of claim 5,
The processor comprising:
And controls at least one of the remote terminal apparatus that has transmitted the failure indicator to request the at least one of the information on the time at which the failure indicator was generated, information on the failure current, and the failure indicator, And determines the failure position based on the received information. 3. The method of claim 2,
Wherein the information on the fault current includes at least one of a voltage value of the fault current, a current value of the fault current, and a line impedance value to a power distribution line.

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