JP5615770B2 - Accident section judgment device and system in dendritic distribution system - Google Patents

Description

  The present invention corrects the accident information of the switch that is inconsistent with the surrounding accident information in the dendritic distribution system divided into sections by the sensor built-in switch, and consistency of the accident direction data in the entire accident distribution line It is related with the accident area determination apparatus and system in a dendritic power distribution system which confirms and determines an accident area.

  As a method for determining an accident section of a distribution system, in Patent Document 1, Patent Document 2, and Patent Document 3, a section where a ground fault direction detected by a ground fault direction detection relay provided for each section is determined to be an accident section. A method is disclosed.

  In Patent Document 4 and Patent Document 5, a case where a ground fault current in the load direction is detected by the substation side switch in contact with the section, and a ground fault current in the load direction is not detected by all the load side switches. A method for determining an accident is disclosed.

  Patent Document 6 describes a method for determining a section having the maximum sum of ground fault currents flowing into a section as an accident section.

JP 2001-352668 A Japanese Patent Laid-Open No. 10-032924 Japanese Patent Laid-Open No. 07-163047 Japanese Patent Laid-Open No. 07-015867 JP 05-292659 A JP 2006-258485 A

  In the above-described method, there is a problem in that when there is a sensor abnormality in the switch, a plurality of sections are extracted as accident sections and an appropriate accident section cannot be determined.

  The present invention solves these problems, estimates the sensor abnormality of the switch, corrects the data, confirms the consistency of the accident direction data in the entire accident distribution line, and determines the accident section in the dendritic distribution system An object of the present invention is to provide an accident section determination device and system.

  A feature of the present invention is that a dendritic distribution system connected to a substation switch, a plurality of switches arranged in various sections of the dendritic distribution system and dividing the distribution system into appropriate sections, and connected to the switch In an accident section determination system for a distribution system having a communication network and an accident section determination apparatus connected to the communication network, the accident section determination apparatus is configured to be installed at each installation point of a plurality of switches when an accident occurs in a dendritic distribution system. A first process for determining an accident direction, identifying a faulty switch by correcting consistency between a plurality of accident directions for a plurality of switches in a dendritic distribution system, and correcting the detected accident direction; A second process for determining an accident section using a plurality of accident directions for the plurality of switches of the dendritic distribution system including the accident direction corrected in the first process;

  In addition, as a first criterion for consistency determination, the number of accidents detected by the target switch is the substation direction, and the number of loads on the load side of the switch is the load direction is two or more. Then, when the number of the substation-side switches of the switch whose number of faults is the substation direction is zero, the fault direction detected by the target switch is corrected to the load direction.

  In addition, as a second criterion for consistency judgment, the number of accidents detected by the switch of interest is the load direction, and the number of accidents in the substation side of the total number of substation switches of the switch is two. As described above, when the number of load-side switches of the switch whose number of accidents is the load direction is zero, the accident direction detected by the target switch is corrected to the substation direction.

  Further, in the second process, it is determined whether or not there is a switch that does not detect accident information among the plurality of switches of the dendritic distribution system, and different accident section determination processes are executed depending on the presence or absence of the switch. To do.

  Also, when all switches detect the accident information and the accident directions detected by the switches at both ends that divide the section of the dendritic distribution system indicate the inside of the section, the section is set as a temporary accident section, When there is only one temporary accident section on the power distribution system, for all switches except the switches at both ends of the section, when the detected accident direction and the provisional accident section all match, The provisional accident section is defined as an accident section.

  Also, when there is a switch that has not detected accident information, give the substation direction as the accident direction to the switch for which no accident information has been detected, and determine the substation direction first in the switch connection sequence from the substation. The switch in front of the selected switch is set as the disconnect switch, and the disconnect switch at the position closest to the substation is used as the range switch with the possibility of an accident, and the fault section is cut off.

  Correcting accident information of switches that cannot be matched with surrounding switch accident information using a simple technique, assuming that there is a low probability of failure of multiple sensor built-in switches at the same time on a single distribution line. Is possible.

  In addition, according to the embodiment of the present invention, since the accident section determination is performed by confirming the consistency of the accident direction data in the entire accident distribution line, it is possible to perform the accident section determination on the safe side from the conventional method. is there.

  In addition, according to the embodiment of the present invention, even when there is a sensor abnormality or the like, even when the accident section cannot be specified as one, it is possible to extract a group of switches for separating a possible accident area from the healthy section. In addition, after opening this switch, it is not necessary to perform a test transmission from a substation as in the past, but to perform a test transmission using this accident section disconnect switch as the starting position, so a healthy section is unnecessary. It is possible to improve the supply reliability without any power outage.

The figure which shows the processing flow of the whole accident area determination method. The figure which shows the accident direction judgment result example in process step S2 of FIG. 1 when there exists a sensor abnormality in a power distribution system. The figure which shows the example of an accident direction judgment result in process step S2 of FIG. 1 when there is no sensor detection in a power distribution system. The figure which shows the structural example of the distribution line accident area determination system of this invention. The figure which shows the detailed process flow of accident direction data correction | amendment which considered the sensor abnormality in process step S3 of FIG. The figure which shows the accident direction data list produced by process step S31 of FIG. 5 in the case of FIG. The figure which shows the accident direction data list produced by process step S31 of FIG. 5 in the case of FIG. The figure which shows the other example of the accident direction data list produced by process step S31 of FIG. The figure which shows the process of process step S5 of FIG. 1 in the case of FIG. 6a. The figure which shows the process of process step S5 of FIG. 1 in the case of FIG. 6c. The figure which shows the process of process step S7 of FIG. 1 in the case of FIG. 7a. The figure which shows the process of process step S7 of FIG. 1 in the case of FIG. 7b. The figure which shows the detail of step S11 of FIG. The figure which shows the relationship between a power distribution route and the accident direction data of a switch.

  Embodiments of the present invention will be described below with reference to the drawings.

  In describing an embodiment of the present invention, an example of a distribution system to which the present invention can be applied and a typical accident direction determination result will be described with reference to FIGS. 2 and 3.

  2 and 3 show the same distribution system. In these figures, FCB is a switch installed in a substation, 121 to 127 are sensor built-in switches provided in the distribution system, and the distribution system is divided into sections 131 to 138 by the sensor built-in switch. ing. In the illustrated example, the distribution system is a branch distribution system that branches in the section 135 in the direction of the section 136 and in the directions of the sections 137 and 138.

  Of these, FIG. 2 shows an accident direction determination result when there is a sensor abnormality, and FIG. 3 shows an accident direction determination result when no sensor is detected. In the example of FIG. 2 showing the accident direction determination result when there is a sensor abnormality, the original accident section is 137, but it is assumed that there is a sensor abnormality in the switch 122 at the same time. In this case, the accident direction detected by each sensor built-in switch 121-127 should indicate the direction of the accident section 137 originally assumed, but the sensor built-in switch 122 is in the opposite direction (substation side) due to its abnormality. Is shown.

  However, in the case of FIG. 2, in the method of Patent Document 1, sections having different determination directions at both ends of the section are selected as accident sections, so four sections 132, 133, 135, and 137 are extracted. For this reason, an appropriate accident section cannot be determined. Further, in the method of Patent Document 2, since a section in which the determination directions at both ends of the section are both inflow directions is selected as the accident section, two sections 132 and 137 are extracted. For this reason, an appropriate accident section cannot be determined.

  In the example of FIG. 3 showing the accident direction determination result when the sensor is not detected, it is assumed that the original accident section is 133, and the switch 122 cannot detect the accident current due to the sensor abnormality. In this case, in the method described in Patent Document 3, the fault section is determined as the fault section in order to determine the fault section based on the logic that the ground fault current flowing from the substation side is larger than the ground fault current flowing from the load side. It is not possible to determine the appropriate accident section.

  All of the conventional techniques are section determination methods by comparing accident directions of sensors provided individually at both ends of a section in section units.

  On the other hand, it is possible to specify the sensor abnormality location by obtaining the determination result of the sensor of the entire power distribution system and logically determining the consistency. For example, in the case of FIG. 2, there are three switches (123, 124, 126) indicating that the accident data is in the load direction on the load side of the switch 122. On the other hand, there is no switch whose accident data is in the direction of the substation on the substation side of the switch 122. If it judges for the whole power distribution system for this, it turns out that the possibility of the sensor abnormality of the switch 122 is high.

  In the present invention, the sensor abnormality is confirmed by logically judging the consistency of the determination result of the sensor of the entire distribution system, and then the accident section is determined. That is, the present invention intends to perform a two-stage process of consistency check and accident section calculation.

  FIG. 4 is a diagram illustrating a configuration example of a distribution line accident section determination system according to the present invention. Here, the sensor built-in switch 120 of the power distribution system 100 is connected to the accident section determination device 10 via the communication line 210 and the communication network 200. The power distribution system 100 includes a distribution substation 110, a sensor built-in switch 120, and a section 130 connecting them. The sensor measures the current passing through the switch, the voltage reached by the switch, and the accident direction, and sends information to the accident section determination device 10 via the communication network 200.

  The accident section determination device 10 includes a display device 11, an input means 12, such as a keyboard and a mouse, a computer (CPU) 13, a communication means 14, a RAM 15, and various databases (a program database 21, a measurement database 22, and an equipment database 23). These are connected to the bus line 30.

  A computer (CPU) 13 executes a calculation program to instruct image data to be displayed, search data in various databases, and the like. The RAM 15 is a memory that temporarily stores calculation result data such as accident direction data correction results and accident section determination results, and the CPU 13 generates necessary data and displays it on the display device 11 (for example, a display screen).

  The database in the accident section determination apparatus 10 is roughly divided into two types of databases. One of the databases is a database for storing data, and the databases such as the measurement database 22 and the facility database 23 correspond to this. The other is a program database 21 that stores a program for determining an accident section using data stored in the measurement database 22 or the facility database 23.

  Among them, the measurement database 22 includes information on the distribution system (switch passing current, switch arrival voltage) collected from the sensor built-in switches 120 in each part of the distribution system, information on the accident direction obtained from the result, and the like. Is accumulated. The facility database 23 stores basic information (switch attribute, section attribute, phase attribute) and the like necessary for determining the accident direction. In the facility database 23, sections and switch names at both ends are recorded in association with each other, and the number of terminals in the section is stored.

  The program database 21 stores an accident section determination program, which is a calculation program, and an accident direction data correction program.

  FIG. 1 shows a processing flow of the entire accident section determination method realized by the accident section determination program among the calculation programs stored in the program database 21.

  FIG. 5 shows a process flow of accident direction data correction in consideration of sensor abnormality realized by the accident direction data correction program among the calculation programs stored in the program database 21.

  First, the overall process flow of the accident section determination method in FIG. 1 will be described. This overall flow is roughly classified into two functions. One of them is a function for confirming sensor abnormality by logically judging the consistency of the judgment results of the sensors in the entire distribution system, and the second is a function for confirming an accident section thereafter. The former consistency check function is executed in step S3 of FIG. 1, and details are shown in the flow of FIG. The latter function is an accident section calculation function after step S4 in FIG. As described above, the present invention performs two-stage processing of consistency check and accident section calculation.

  In executing the series of processes shown in FIG. 1, in step S1, which is the first step, from all of the sensor built-in switches installed in the accident distribution line (except for switches with a standard operating state of OFF), Collect accident information. The collected information is accumulated in the measurement database 22.

  In step S2, ground fault current direction determination is performed using the phase characteristics or the like stored in advance in the equipment database 23 based on the accident information collected in step S1, and “substation direction T” or “ “Load direction L” is given. The accident direction data obtained by performing the ground fault current direction determination is stored in the measurement database 22.

  In addition, regarding the processing so far, the accident section determination device 10 has obtained information such as the accident current from the sensor built-in switch and calculates each accident direction in step S2. The accident direction may be calculated and the result may be collected in the accident section determination device 10.

  In the ground fault current direction determination result, in the case of FIG. 2, the switches 121, 123, 124 and 126 are “load direction L”, and the switches 122, 125 and 127 are “substation direction T”. In the case of FIG. 3, only the switch 121 is “load direction L”, and the switches 123, 124, 125, 126, and 127 are “substation direction T”. However, since the switch 122 does not give accident information, it does not do either.

  Next, the process proceeds to step S3. Since the details of the process in step S3 are shown in the accident direction data correction program in FIG. 5, the process proceeds to the flow in FIG. 5 and will be described first.

  In the flow of FIG. 5, in the first step S31, an accident direction data list is created from the accident direction data (load direction L, substation direction T) at each switch determined in step S2. This is like FIG. 6a in the case of FIG. In FIG. 6a, data of the load direction L or the substation direction T is recorded for each switch number 121-127. The accident direction data list in the case of FIG. 3 is as shown in FIG. 6b.

  In step S32, the total number of switches (load side switches) determined to be the load direction L is extracted for each switch in the accident direction data list, and the number of those switches is counted. Further, in step S33, the total number of switches (substation side switches) determined as the substation direction T is extracted for each switch in the accident direction data list, and the number of those switches is counted.

  As a result, in the case of FIG. 2 (FIG. 6 a), four are “load direction L” and three are “substation direction T”. In the case of FIG. 3 (FIG. 6 b), one (switch 121) is “load direction L”, and switches 123, 124, 125, 126, 127 are “substation direction T”.

  In step S34, corrected accident direction data is created. The corrected accident direction data is for evaluating the validity of the determination result for each switch and correcting the determination result of the accident direction. Specifically, the correction process is executed according to the following criteria.

  The first criterion is that the accident direction data is “substation direction T” and the number of load side switches of the switch is “load direction L”, and there are two or more units. If the number of accident direction data in the “substation direction T” among the total number of switches at the substation side is zero, the load direction L is corrected.

  When this criterion is applied to FIG. 6 a, the switches whose accident direction data is “substation direction T” are 122, 125 and 127. Of these, when attention is paid to the first switch 122, the number of load side switches (five units) in which the accident direction data is “load direction L” is two or more (three units 123, 124, 126). Of the total number (1 unit) of the substation-side switches of the switch 122, the number in which the accident direction data is “substation direction T” is 0. As a result, the switch 122 is corrected in the “load direction L” according to the first reference.

  In addition, if the same first standard is applied to the next switch 125 or 127, “the number of the load direction switches with the accident direction data“ load direction L ”out of the total number of the load side switches” does not match “two or more units”. The load direction L is not corrected.

  In short, the first standard specifies the sensor built-in switch that has caused an error that the direction determination result should be the load direction and the substation direction.

  The second criterion is that the accident direction data is “load direction L”, and the number of accident direction data “substation direction T” out of the total number of substation switches of the switch is two or more. If the number of load-side switches in the unit where the accident direction data is “load direction L” is zero, the number is corrected to “substation direction T”.

  In conclusion, this logic specifies the sensor built-in switch that has caused an error that the direction determination result should be the substation direction and the load direction. FIG. 6c shows this example, and in this example, the correctness of the logic is verified. The case of FIG. 6c is an error case in which the load direction is determined on the downstream side (load side) even though there is an accident point in the section 132 on the upstream side (substation side).

  When this second criterion is applied to FIG. 6 a, the switches whose accident direction data is “load direction L” are 121 and 124. Among these, when paying attention to the first switch 121, the total number of substation-side switches of the switch 121 is zero. Accordingly, among these, the number of accident direction data “substation direction T” cannot be more than two. There is a switch 124 whose accident direction data is “load direction L” out of the total number of load side switches (122 to 127) of the switch 121. Therefore, since the number is not zero, it cannot be corrected to “substation direction T”.

  For this reason, when the application of the second standard is focused on the next switch 124, the fault direction data among the total number of substation side switches (121, 122, 123) of the switch 124 is “substation”. The number in the direction T ”is two or more (122, 123), and the accident direction data of the total number of load side switches (125, 126, 127) of the switch 124 is“ load direction L ”. The number is zero. As a result, in the case of the switch 124, the correction is made in the “substation direction T”.

  In the third standard, in the case other than the above, the accident direction data is the same (not changed).

  The series of criteria in step S34 is basically based on the premise that there is a low probability of failure of a plurality of sensor built-in switches at the same time with one distribution line, and the accident directions of switches that cannot be matched with the fault direction data of surrounding switches. It shows the idea of correcting the data.

  In the next step S35 in FIG. 5, the accident direction data obtained in step S31 in FIG. 5 and the corrected accident direction data obtained in step S34 in FIG. 5 for each switch in the first step S1 in FIG. And compare. The comparison results are shown in FIGS. 6a and 6c. In short, in the case of FIG. 6a, the judgment result of the switch 122 should be changed from the substation side T to the load side L. In the case of FIG. The determination result of the device 124 should be from the load side L to the substation side T.

  In the next step S36, the number of switches whose judgment results are different before and after correction is determined, and only when there is only one switch with different accident direction data and corrected accident direction data, Make corrections. As a result, in the case of FIG. 6a, the judgment result of the switch 122 is changed from the substation side to the load side, and in the case of FIG. 6c, the judgment result of the switch 124 is changed from the load side to the substation side.

  In the last step S37 of FIG. 5, “accident direction data” is corrected. Specifically, the accident direction data is replaced with corrected accident direction data.

  The series of processes in FIG. 5 described above is realized by executing the accident direction data correction program among the programs in the program database 21 in the accident section determination apparatus 10 in FIG. 4, and as accident direction data in the measurement database 22, The accident direction of each switch after correction is newly stored. After these processes are completed, the process returns to the process flow of FIG. 1 again, and step S4 is executed. In the processing after step S4, the accident section is specified using the corrected accident direction data.

  First, in step S4, the presence / absence of a switch with no accident information detection is determined. If yes, step S10 is executed. If not, step S5 is entered. Thereby, according to the presence or absence of a switch without accident information detection, the accident section calculation process suitable for each is performed. In the process of FIG. 5, among the various failure modes of the switch, countermeasures have been taken for failure modes in which the accident direction is misjudged, but on the side of step S10, countermeasures for failure modes in which there is no switch output are executed. .

  First, a process when there is no switch for which no accident information has been detected in the process of step S4 will be described. An example of this case is FIG. 6a.

  In the first step S5 after the determination, a provisional accident section is extracted. For this reason, here, the total number (131-138) of the section number of the accident distribution line is extracted, and all the accident direction data of the switches adjacent to the section (except for the switch whose standard operation state is off) are all in the section. The section that is in the direction toward is the provisional accident section. In other words, a section in which current flows from both ends is set as a provisional accident section. Needless to say, the accident direction data used here is the accident direction data corrected in step S3.

  FIG. 7 shows the relationship between the section number in each case of FIG. 6 and the accident direction data of the switch adjacent to the section. FIG. 7a is that of FIG. 6a, and it can be seen that section 137 is a provisional accident section. Similarly, FIG. 7b is that of FIG. 6c, and it can be seen that the section 132 is a provisional accident section. In this figure, a right arrow or a downward arrow means a load direction L, and a left arrow and an upward arrow mean a substation direction T.

  In step S6, the number of provisional accident sections is determined. In both cases of FIG. 7a and FIG. 7b, the number of provisional accident sections is single (one), so in this case, the process proceeds to step S7. If there are a plurality of provisional accident sections, the process proceeds to step S11, where a group of switches for separating a possible accident area from the healthy section is extracted.

  In step S7, the provisional accident section direction and the accident direction data are compared for all the switches that do not contact the provisional accident section. That is, for all the switches that do not contact the provisional accident section, the direction of the provisional accident section viewed from the switch is compared with the accident direction data.

  FIG. 8 arranges FIG. 7 from this viewpoint. In the case of FIG. 7a, since the provisional accident section is 137 as shown in FIG. 8a, the provisional accident direction and accident direction data from the switch 121-125 excluding the switches 126, 127 in contact therewith are shown. Is described. Both switches have the same direction. In addition, since the switch 125 is a switch provided in the three-terminal section of the branch, it is considered that the actual fault current flows to the load side of another circuit (section 137 side). It is assumed that the provisional accident direction and accident direction data viewed from the equipment flowed to the substation side regardless of the presence of other branch terminals.

  Similarly, in the case of FIG. 7b, as shown in FIG. 8b, the provisional accident section is 132. Therefore, for the switches 123-127 excluding the switches 121 and 122 in contact therewith, the provisional accident direction from the switch and the accident The direction data is described. Both switches have the same direction.

  In step S8, it is determined whether or not there is a mismatch. If there is an inconsistency in the comparison result in step S7, the process proceeds to step S11, and the determination of the accident section is not performed, but the switch group for separating the range where the accident is likely from the healthy section is extracted. Since there is no inconsistency in the above case, the process proceeds to step S9 to determine the accident section. Here, the provisional accident section that was provisionally handled is officially determined as the accident section.

  The series of processing from processing step S1 to processing step S9 in FIG. 1 has been described above with reference to FIG. This explanation has consistently explained the accident case of FIG. Here, the accident example of FIG. 3 was postponed in the branch determination step S4 of FIG.

  Since the explanation of the sensor abnormality case in FIG. 2 has been described above, the description returns to the branch determination step S4 in FIG. 1 and the handling in the case of the accident in FIG. 3 will be described. Note that the data prepared in the accident example of FIG. 3 up to step S4 is only the accident direction data (FIG. 6b) in step S2.

  In branch determination step S4, it was determined whether or not there was a switch without accident information detection. With this judgment, it was found that the switch 122 in the example of FIG. 3 was a switch without accident information detection, and the process proceeds to the next step S10.

  In step S10, accident direction data for the switch 122 without accident information detection is created. Here, “substation direction T” is given as accident direction data to the switch for which no accident information has been detected. FIG. 6 b describes that “no signal” has been changed to T meaning “substation direction”. After giving the information of “substation direction T”, the process proceeds to the next step S11. In step S11, the possibility of accident possible range switching switches is extracted, and the details are shown in FIG.

  In FIG. 9 showing the details of step S11, a series of processing from step S111 to step S115 is to identify the connection order of the switches of the distribution system installed on the load side of the substation switch FCB. This is the identification of the distribution system route. This route may have a connection relationship stored in advance, or may be confirmed each time. In the latter case, the switch connection information (information such as the names of the sections and the switches at both ends) stored in the equipment database 23 of the accident section determination device 10 in FIG. 4 is used.

  Here, the case where this route is confirmed when an accident occurs will be described. For this purpose, first, in the first step S111 in FIG. 9, the switch closest to the distribution system installed on the load side of the substation switch FCB in FIG. 3 is extracted. This switch is the switch 121 of FIG.

  In the next step S112, a route (first stage) to the end is created. Here, specifically, for the substation switch FCB and the switch data acquired in the first input capture step S1 in FIG. 1, data combining each of a plurality of switches is created and stored. .

  The processing from step S113 to step S115 is repeatedly executed until there is no corresponding load-side switch. For example, after the switch 121 is first extracted as the most recent switch in the distribution system installed on the load side of the substation switch FCB, the switch is then switched as the load-side switch of the switch 121. The vessel 122 is extracted, and a route to the end is formed in the order of extraction.

  If the load-side switch does not exist or if the standard operation state is a switch that is off even if it exists, this is not extracted and stored as “end”. When there are no more load-side switches to be extracted, the derivation of the route from the FCB to the terminal ends.

  As a result, route 1 to FCB-121-122-123-124-125 and route 2 to FCB-121-122-123-124-126-127 are extracted and stored. After route extraction, the process proceeds to step S116.

  In step S116, the accident direction data of the switch is extracted in order from the FCB to the end for each of the data of the plurality of routes from the extracted FCB to each end. The relationship between the extracted route and the accident direction data of the switch is as shown in FIG. 10 in the example of FIG. The upper part of FIG. 10 shows the relationship between route 1 and the accident direction data of the switch, and the lower part shows the relationship between route 2 and the accident direction data of the switch. In addition, since the switch 122 is a switch without a detection signal, it is defined as the substation direction T in the preceding step S10.

  In step S117, the disconnect switch is extracted. For this determination, the fault direction data is checked in order from the FCB to the end for each of the plurality of routes (route 1 and route 2) obtained in step S116, and before “substation direction T” appears first. This switch is called a “separated switch”. In the case of the route 1 in FIG. 10, the switch 122 is the switch in which the “substation direction T” first appears, and therefore the switch 121 in front of the switch 122 is referred to as a “separated switch”. In addition, since the case of FIG. 3 shows the case where the accident occurred before the branch point, the determination results for the two routes are the same.

  In step S117, the overlap is deleted from the derived “separation switch”. For example, in the two cases of FIG. 10, since the switches derived for each route are the same, duplication is eliminated.

  In step S118, the total number of substation-side switches is extracted for each of the remaining “separation switches”, and the data of “separation switches” remaining in step S118 is extracted into the substation-side switches. Any data that exists is deleted. In step S119, the “separated switch with possibility of accident” obtained by the “isolated switch” data remaining in this way is obtained. In other words, in the case where a plurality of “separation switches” are generated on the same route, the upstream side is designated as “range switch with possibility of accident”.

  In the determination of the accident section of the present invention shown in FIG. 1 described above, a sensor abnormality (no signal) of the switch 122 is estimated for the above-described reason, and correction of this data (information on the substation side T in FIG. 6b is given). Process). Further, the section with only the inflow of the fault current is only the section 137, and the fault direction data of the entire fault distribution line that all the fault direction data of the switches not in contact with the section 137 are directed to the section 137. It is determined that the accident section is the section 137 after confirming the consistency. As described above, by confirming the consistency of the accident direction data in the system twice, it is possible to determine an appropriate accident section.

  In the accident section judgment of the present invention, when there is a switch for which no accident information has been detected, the accident section is not specified, and accident direction data in the direction of the substation is given to the switch, and continuously from the substation. In order to open the switch on the most substation side of the group of switches whose accident direction data is the load direction, the switch 121 is opened, and the accident section standing on the safe side can be separated.

  The present invention can be applied to an accident section determination device that corrects accident direction data and determines an accident section from an accident direction observation value from a sensor installed in a power distribution system. Moreover, since the accident section can be determined, it can be used as a function of the power distribution automation system.

10: Accident section determination device 11: Display device 12: Input means 13: CPU
14: Communication means 15: RAM
21: Program data 22: Measurement database 23: Equipment database 30: Bus line 100: Distribution system 110: Distribution substation 120: Sensor built-in switch 130: Section 140: Accident point 200: Communication network 210: Communication line

Claims (10)

A dendritic distribution system connected to a substation switch, a plurality of switches arranged in various sections of the dendritic distribution system and dividing the distribution system into appropriate sections, a communication network connected to the switch, and the communication network In the accident section judgment system of the distribution system having the fault section judgment device connected to
The accident section determination device obtains an accident direction at an installation point of each of the plurality of switches when an accident occurs in the dendritic distribution system, and a plurality of accident directions for the plurality of switches of the dendritic distribution system A first process for identifying the abnormal switch and correcting the accident direction detected by the consistency judgment between
A second process for determining an accident section using a plurality of accident directions for the plurality of switches of the dendritic distribution system including the accident direction corrected in the first process ;
As a first criterion for the consistency judgment, the fault direction detected by the target switch is the substation direction, and the total number of load side switches of the switch is that the fault direction is the load direction is two or more. If the number of substation-side switches in the switch whose number of faults is the substation direction is zero, the fault direction detected by the target switch is corrected to the load direction. Characteristic distribution system fault section judgment system. In the accident section determination system for the distribution system according to claim 1 ,
As a second criterion for the consistency judgment, the number of accidents detected by the target switch is the load direction, and the number of accidents in the substation side is two or more. Then, when the number of load-side switches of the switch whose number of faults is the load direction is zero, the fault direction detected by the switch of interest is corrected to the substation direction. System fault section judgment system. In the accident section determination system for the distribution system according to claim 1,
In the second process, it is determined whether or not there is a switch that does not detect accident information among the plurality of switches in the dendritic distribution system, and a different accident section determination process is executed depending on the presence or absence A system for determining an accident section of a power distribution system. In the accident section judgment system for the distribution system according to claim 3 ,
When all the switches detect accident information and the accident directions detected by the switches at both ends that divide the section of the dendritic distribution system indicate the inside of the section, the section is set as a provisional accident section, and the tree branch When there is only one temporary accident section on the power distribution system, for all switches except the switches at both ends of the section, when the detected accident direction and the provisional accident section all match,
An accident section determination system for a distribution system, wherein the provisional accident section is an accident section. In the accident section determination system for the power distribution system according to claim 3 or claim 4 ,
When there is a switch that has not detected the accident information, give the substation direction as the accident direction to the switch that has not detected the accident information.
The switch in front of the switch that was first determined to be in the direction of the substation in the switch connection sequence from the substation is the disconnect switch,
A fault section judgment system for a power distribution system, wherein fault section disconnection is executed by using the disconnecting switch closest to the substation as a possible fault disconnecting switch. In the fault section judgment device of the distribution system in which a plurality of switches arranged in appropriate sections and arranged in various sections of the dendritic distribution system connected to the substation switch are connected by a communication network,
Upon occurrence of an accident in the dendritic distribution system, determine the accident direction at each installation point of the plurality of switches, and by determining consistency between the plurality of accident directions for the plurality of switches in the dendritic distribution system A first process for identifying a faulty switch and correcting an accident direction detected by the first process, and a plurality of switches for the plurality of switches of the dendritic distribution system including the accident direction corrected in the first process. a second process for determining fault section with accidents direction,
As a first criterion for the consistency judgment, the fault direction detected by the target switch is the substation direction, and the total number of load side switches of the switch is that the fault direction is the load direction is two or more. If the number of substation-side switches in the switch whose number of faults is the substation direction is zero, the fault direction detected by the target switch is corrected to the load direction. A characteristic fault section judgment device for the distribution system. In the accident section determination device for the distribution system according to claim 6 ,
As a second criterion for the consistency judgment, the number of accidents detected by the target switch is the load direction, and the number of accidents in the substation side is two or more. Then, when the number of load-side switches of the switch whose number of faults is the load direction is zero, the fault direction detected by the switch of interest is corrected to the substation direction. System fault section judgment device. In the accident section determination device for the distribution system according to claim 6 ,
In the second process, it is determined whether or not there is a switch that does not detect accident information among the plurality of switches in the dendritic distribution system, and a different accident section determination process is executed depending on the presence or absence A fault section determination device for a power distribution system. In the accident section determination device for the distribution system according to claim 8 ,
When all the switches detect accident information and the accident directions detected by the switches at both ends that divide the section of the dendritic distribution system indicate the inside of the section, the section is set as a provisional accident section, and the tree branch When there is only one temporary accident section on the power distribution system, for all switches except the switches at both ends of the section, when the detected accident direction and the provisional accident section all match,
An accident section determination device for a distribution system, wherein the provisional accident section is an accident section. In the accident section determination device for a power distribution system according to claim 8 or claim 9 ,
When there is a switch that has not detected the accident information, give the substation direction as the accident direction to the switch that has not detected the accident information.
The switch in front of the switch that was first determined to be in the direction of the substation in the switch connection sequence from the substation is the disconnect switch,
A fault section judging device for a distribution system, wherein fault section disconnection is executed by using the disconnect switch located closest to the substation as a fault disconnect range switch.

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