JP6492529B2 - Distribution system disconnection detection system - Google Patents

Description

  The present invention relates to a distribution system disconnection detection system that detects disconnection of a distribution line that supplies power from a high-voltage line connected to a distribution transformer to a low-voltage line via a pole transformer.

  When a disconnection occurs in the distribution system, the voltage of the distribution line tends to decrease, and a power company patrolman discovers the disconnection point by conducting a field survey mainly based on reports from customers. In addition, when natural phenomena such as typhoons and lightning occur, there is a possibility that the distribution line may be broken. In such a case, the power company patrolman will conduct a field survey. Thus, the search for the disconnection of the distribution line is performed when there is an indication of the disconnection of the distribution line.

  As information that automatically detects disconnection of distribution lines, information related to the power consumed by each customer or the voltage received by the customer is tabulated and tabulated using a meter-reading device installed in each customer. There is one in which power or voltage is transmitted to a disconnection location determination device, and the disconnection location determination device identifies a disconnection location or a disconnection area based on information on each voltage or power (for example, see Patent Document 1). ).

JP 2011-250580 A

  However, in the thing of patent document 1, the high performance of a meter-reading apparatus is needed. In order to determine disconnection, it is necessary to calculate and determine the disconnection determination threshold value by storing and sequentially reading the power consumption amount and voltage value over 24 hours. Since it is necessary to call a disconnection alarm by reliable communication even in a state after disconnection, a measure for securing communication power such as battery mounting is necessary.

  Moreover, a high-performance communication function is required for the meter reading device and the disconnection point determination device. Since it is necessary to collect and analyze the disconnection alarms of all the meter reading devices that have been called by the disconnection point determination device, it is necessary to be able to communicate a lot of data instantaneously.

  Furthermore, it is necessary to manage the connection phase of the meter reading device. In order to determine the disconnection section, the alarm attribute data includes information necessary for creating the disconnection section determination table, for example, a correspondence database between the meter reading device, the customer, and the transformer, and the high voltage to which the transformer is connected. A database for the connection phase of the system is required.

  The purpose of the present invention is to reduce the calculation processing of the meter installed in each consumer, to reduce the communication processing between the meter and the disconnection point search unit, and to manage the connection phase of the transformer and the meter is unnecessary. It is to provide a disconnection detection system.

  The distribution system disconnection detection system of the present invention has a plurality of low voltage lines branched from a dendritic high voltage line connected to a distribution transformer via a pole transformer, and the power supply side is a power supply side and the power reception side In the distribution system disconnection detection system that detects the disconnection of the high-voltage line and the low-voltage line of the distribution system that supplies power from the high-voltage line to the low-voltage line, the power supply line is connected from the low-voltage line via a lead-in line. A meter provided at the power receiving end of each consumer and having a function of measuring at least the voltage and transmitting the measured voltage, and the disconnection portion of the high-voltage line based on the voltage of the meter that receives the voltage measured by the meter A high-voltage line break location search unit that receives the voltage measured by the instrument and searches for the break location of the low-voltage line based on the voltage of the meter, the high-voltage line Search for disconnection Is activated when there is a request for detection of disconnection of the distribution line, determines the voltage of the meter at the end of the low-voltage line, and when the voltage of the meter at the end of the low-voltage line is abnormal, the column of the low-voltage line When the upper transformer is a voltage abnormal transformer and the voltage of the meter at the end of the low voltage line is normal, the pole transformer of the low voltage line is a normal voltage transformer, and the voltage normal transformer on the most adjacent load side is adjacent. It is determined that there is a possibility of disconnection in the high-voltage line between the power supply and the voltage abnormal transformer on the most power source side, and the low-voltage line disconnection location searching unit is the high-voltage line disconnection location searching unit. It is activated when the instrument is 1 or less, determines the voltage of the instrument connected to the low-voltage line, the instrument with the abnormal voltage is the abnormal voltage instrument, the instrument with the normal voltage is the normal voltage instrument, and adjacent The voltage normal meter on the most load side and the most on the load side And judging that there is a possibility of breakage to a low pressure line between the voltage abnormality meter source side.

  According to the present invention, since the search for the disconnection point is performed not by the consumer-side instrument but by the high-voltage line disconnection point search unit or the low-voltage line disconnection point search unit, the calculation processing of the instrument can be reduced. In addition, the high voltage line break location search unit is activated when a request for detection of disconnection of the distribution line is made, and the low voltage line break location search unit is also activated by the high voltage line break location search unit. The information to be sent to the power supply section and the low-voltage wire break location search section is only at the time of searching for the break location, and furthermore, the information required for searching for the break location is only the voltage of the instrument, so communication processing can be greatly reduced. Since the disconnection location can be determined from the voltage to which the meter is connected, it is not necessary to manage the connection phase between the transformer and the meter.

The lineblock diagram of the distribution system disconnection detection system concerning the embodiment of the present invention. Explanatory drawing of the meter which takes in data (voltage) in the case of the high voltage line disconnection location search part in embodiment of this invention in the case of a disconnection location search of a high voltage line. Explanatory drawing of the aspect of a pole transformer, a low voltage line, and a meter when a disconnection occurs in a high voltage line of a distribution line. Explanatory drawing of the aspect of a pole transformer, a low voltage line, and an instrument at the time of determining that there is no disconnection in the high voltage line of a distribution line, and there exists one voltage abnormal transformer by the high voltage line break location search part. Explanatory drawing of the meter which takes in data (voltage) in the low voltage line disconnection location search part in the embodiment of this invention mainly in the case of a disconnection location search by the side of a low voltage line. Explanatory drawing of the disconnection search of a low voltage wire disconnection location search part when it determines with there being no voltage abnormal transformer in a high voltage wire disconnection location search part. The flowchart which shows an example of the processing content of the disconnection search of the high voltage line disconnection location search part at the time of applying the distribution system disconnection detection system which concerns on embodiment of this invention to the distribution line whose pole transformer consists only of a power transformer. The flowchart which shows an example of the processing content of the disconnection search of the low voltage wire disconnection location search part at the time of applying the distribution system disconnection detection system which concerns on embodiment of this invention to the distribution line whose pole transformer consists only of a power transformer. It is a schematic explanatory drawing of the disconnection search of the high voltage line disconnection location search part at the time of applying the distribution system disconnection detection system which concerns on embodiment of this invention to the distribution line whose pole transformer consists only of an electric light transformer. The flowchart which shows an example of the processing content of the disconnection search of the high voltage line disconnection location search part at the time of applying the distribution system disconnection detection system which concerns on embodiment of this invention to the distribution line in which a pole transformer consists only of an electric light transformer. The flowchart which shows an example of the processing content of the disconnection search of the low voltage line disconnection location search part at the time of applying the distribution system disconnection detection system which concerns on embodiment of this invention to the distribution line in which a pole transformer consists only of an electric light transformer. Processing content of disconnection search of high-voltage line disconnection location search unit when the distribution system disconnection detection system according to the embodiment of the present invention is applied to a distribution line in which a pole transformer is a mixture of a power transformer and a light transformer The flowchart which shows an example. The flowchart which shows an example of the processing content of the search (a) of an electric transformer in FIG. The flowchart which shows an example of the processing content of the search (b) of the light transformer in FIG.

  Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of a distribution system disconnection detection system according to an embodiment of the present invention. The distribution transformer 11 of the substation is connected to a high voltage line 13 via a circuit breaker 12. The high-voltage line 13 is provided with switches 14a, 14b, 14c. The switches 14a, 14b are always closed, and the switch 14c is always open. The switch 14c is closed when power is exchanged with other distribution lines not shown. A plurality of low voltage lines 16a to 16f that are stepped down are connected from the high voltage line 13 via pole transformers 15a to 15f.

  Each of the low-voltage lines 16a to 16f is connected to a consumer's load via a lead-in line, and an instrument S is connected to the power receiving end of the load. In FIG. 1, the illustration of the load is omitted, and only the instrument S is illustrated. That is, the instruments Sa1 to Sa3 are connected to the low voltage line 16a corresponding to the load, the instruments Sb1 to Sb4 are connected to the low voltage line 16b corresponding to the load, and the instrument Sc1 is connected to the low voltage line 16c corresponding to the load. To Sc3 are connected. Similarly, the low-voltage line 16d is connected to the instruments Sd1 to Sd4 corresponding to the load, the low-voltage line 16e is connected to the instruments Se1 to Se4 corresponding to the load, and the low-voltage line 16f is corresponding to the load. Instruments Sf1 to Sf4 are connected. These meters S provided in correspondence with the load have a function of measuring the voltage at the power receiving end of the load and transmitting the measured voltage.

  The high-voltage wire break location searching unit 17 is activated when there is a request for detecting a break in the distribution line. The distribution line disconnection detection request is input to the high-voltage line disconnection location search unit 17 when there is an indication of a disconnection of the distribution line. For example, when there is a report from a customer or when a natural phenomenon such as a typhoon or lightning occurs, the information is input to the high voltage line break location search unit 17. When activated, the high voltage line break location searching unit 17 receives the voltage measured by the meter S via the data receiving unit 18 and searches for the break location of the high voltage line 13 based on the voltage of the meter S. And a search result is output to the output device 19 as needed.

  In addition, the low voltage line break location searching unit 20 is activated by the high voltage line break location searching unit 17 and when activated, the voltage measured by the instrument S is received, and the low voltage lines 16a to 16f are received based on the voltage of the instrument S. Search for disconnection points. And a search result is output to the output device 19 as needed.

  Here, the high voltage line break location search unit 17 basically acquires the voltage of the meter S at the end of the low voltage line 16 and determines whether the voltage is normal or abnormal. When the voltage at the terminal S of the low voltage line 16 is normal, the pole transformer 15 of the low voltage line 16 is a normal voltage transformer, while the voltage at the terminal S of the low voltage line 16 is abnormal. Uses the pole transformer 15 of the low-voltage line 16 as an abnormal voltage transformer. Finally, it is determined whether or not the most normal voltage transformer on the load side and the abnormal voltage transformer on the power supply side are adjacent to each other, and when adjacent, the normal voltage transformer and the abnormal voltage transformer are determined. It is determined that there is a possibility of disconnection in the high-voltage line between This is because the pole transformer 15 on the power supply side from the normal voltage transformer is considered to be a normal voltage transformer, and the pole transformer 15 on the load side from the abnormal voltage transformer becomes an abnormal voltage transformer due to disconnection. It is because it is thought that there is. A meter S surrounded by a dotted line in FIG. 1 is a meter at the end of the low-voltage line 16 that is a candidate for determination of normality / abnormality of voltage in the search for the disconnection location by the high-voltage disconnection location search unit 17. Here, the power supply side in the high-voltage line break location searching unit 17 refers to the power supply side when viewed from a specific position of the high-voltage line, and the load side refers to the power receiving side when viewed from a specific position of the high-voltage line. In addition, the power supply side in the low voltage line disconnection location search unit 20 refers to the pole transformer side as viewed from a specific position of the low voltage line, and the load side refers to the low voltage line end side as viewed from the specific position of the low voltage line.

  A three-phase transformer is used as the distribution transformer 11 of the substation. A power transformer or a light transformer is connected as a pole transformer to the high voltage line on the secondary side of the distribution transformer. In general, the pole-mounted power transformer is a three-phase transformer, and the pole-mounted light transformer is a single-phase transformer. The low-voltage side of the pole-mounted power transformer is a three-phase three-wire system, and the low-voltage side of the pole-mounted light transformer is a single-phase three-wire system.

  Therefore, when the pole transformer is a power transformer, the voltage between the three lines (between the three lines) is taken from the three phases of the high voltage line to the low voltage side, and the power from the three lines to the low voltage line. Is supplied. That is, the line voltage between three two phases is taken out from the three phases of the high voltage line. As a result, power is supplied to the low-voltage power line between the three lines from the power transformer, which is a pole transformer.

  On the other hand, when the pole transformer is an electric transformer, unlike a power transformer, the electric transformer takes out one line (one line) voltage from three phases of the high voltage line. The electric power taken out from is supplied to the low-voltage line. That is, electric power is supplied to the low voltage line of the electric lamp from one electric line transformer to the high voltage line.

  The actual distribution lines are mostly distribution lines in which a power transformer and a light transformer are mixed. In the following description, for the sake of convenience of explanation, only a power transformer is connected as a pole transformer. In the case of a distribution line in which only a light transformer is connected as a pole transformer, the case of a distribution line in which a power transformer and a light transformer are mixed will be sequentially described.

  At that time, in the case of a distribution line to which only a power transformer is connected as a pole transformer, the pole transformer is referred to as a power transformer, and the power low-voltage line gauge is referred to as a power gauge. Similarly, in the case of a distribution line in which only a light transformer is connected as a pole transformer, the pole transformer is referred to as a light transformer, and the low voltage line meter of the light is referred to as a light meter.

  FIG. 2 is an explanatory diagram of an example of an instrument S that takes in data (voltage) when the high-voltage line break location search unit 17 searches for a break location of the high-voltage line 13. FIG. 2 (a) shows various branches of the high-voltage line. FIG. 2B is a distribution system diagram when the high voltage line is simplified.

  FIG. 2 shows an example in which the pole transformer 15 is a power transformer. As described above, the high voltage line break location searching unit 17 basically acquires the voltage of the meter S at the end of the low voltage line 16 and determines whether the voltage is normal or abnormal. A meter S surrounded by a dotted line in FIGS. 2 (a) and 2 (b) is a meter that is a candidate for determination of normality / abnormality of the voltage in the search for the disconnection location by the high-voltage disconnection location search unit 17. And in acquiring the voltage of the meter S at the terminal of the low voltage line 16 and determining whether the voltage is normal or abnormal, there are as many instruments S at the terminal of the low voltage line 16 as the number of low voltage lines. Obtain the voltage of the meter S at the end of the low-voltage line 16 at the load end of the high-voltage main line, determine the normality of the voltage, and sequentially obtain the voltage of the meter S at the end of the low-voltage line 16 at the load side of the high-voltage branch line Determine normal or abnormal. When there is a voltage abnormality, the pole transformer on the low voltage line connected to the meter is a voltage abnormality transformer, and the meter S at the end of the low voltage line connected to the high voltage line on the power supply side from the voltage abnormality transformer The voltage is acquired to determine whether the voltage is normal or abnormal.

  For example, in the power distribution system of FIG. 2A, the low voltage line 16 at the load side end of the high voltage main line is the low voltage line 16f. The low voltage line 16 at the load side end of the high voltage line branch line is 16g, 16e.

  First, the voltage of the instrument Sf4 at the end of the low-voltage line 16f at the load side end of the high-voltage main line is acquired. If the voltage of the instrument Sf4 at the end of the low voltage line 16f is normal, the pole transformer 15f of the low voltage line 16f is a normal voltage power transformer, and if abnormal, the pole transformer 15f of the low voltage line 16f is abnormal in voltage. A power transformer. Similarly, the voltages of the low-voltage lines 16g and 16e at the end of the load side of the high-voltage line branch line are acquired to determine whether the voltage is normal or abnormal.

  If the voltage of the meter Sf4 at the end of the low-voltage line 16f is abnormal and the voltage of the meter Se4 at the end of the low-voltage line 16e at the load-side end of the high-voltage line branch line is abnormal, the high-voltage line on the power supply side from the low-voltage line 16e This is considered to be 13 disconnection.

  Therefore, the voltage of the meter S at the end of the low-voltage line 16 intermediate between the low-voltage line 16a and the low-voltage line 16e, which is the most connected to the low-voltage line 16e and the low-voltage line 16e on the most power supply side, is obtained. Determine whether normal or abnormal and narrow the disconnection. This is to efficiently perform the disconnection search. The low voltage line 16 in the middle between the low voltage line 16a and the low voltage line 16e on the most power source side is the low voltage lines 16b and 16c, and the measuring instruments S at their ends are the measuring instruments Sb4 and Sc3.

  Now, it is assumed that the low voltage line 16c is selected as the intermediate low voltage line 16 between the low voltage line 16a and the low voltage line 16e on the most power supply side, and the voltage of the instrument Sc4 at the end of the low voltage line 16c is acquired. If the voltage of the meter Sc4 is normal, the pole transformer 15c of the low voltage line 16c is set as a voltage normal power transformer. Then, it is determined whether or not the voltage normal power transformer on the most load side and the voltage abnormal power transformer on the most power source side are adjacent to each other.

  In this case, the voltage normal power transformer on the most load side is the pole transformer 15c of the low voltage line 16c, and the voltage abnormal power transformer on the most power supply side is the pole transformer 15e. The pole transformer 15 c and the pole transformer 15 e are not adjacent to each other on the high voltage line 13.

  Since the pole transformer 15c of the low voltage line 16c is normal, the disconnection point is considered to be on the load side from the pole transformer 15c of the low voltage line 16c, so the low voltage line 16c and the low voltage line 16e confirmed last time If the voltage of the meter Sd4 at the end of the intermediate low voltage line 16d is obtained and the voltage is normal, the pole transformer 15d of the low voltage line 16d is a normal voltage power transformer, and the pole transformer 15d is the most load side transformer. A normal voltage power transformer. Since the pole transformer 15d and the pole transformer 15e are adjacent to each other, it is determined that the high voltage line 13 between the low voltage line 16d and the low voltage line 16e may be disconnected.

  In the distribution system of FIG. 2 (a), the case where the branches of the high-voltage lines are diversified and the low-voltage line 16 at the load side end of the plurality of high-voltage line branch lines is described, but in the following description, the description will be simplified. Therefore, as shown in FIG. 2B, a simplified distribution system having one load-side end low voltage line 16 will be described as an example. In FIG. 2B, first, the voltage of the instrument Sf4 at the terminal of the low voltage line 16f at the load side terminal is acquired to determine whether the voltage is normal or abnormal. If the voltage of the meter Sf4 at the end of the low-voltage line 16f is abnormal, it is considered that the high-voltage line 13 on the power supply side is disconnected from the low-voltage line 16f at the end of the load side. Therefore, the high-voltage line 13 in which the most power-side low-voltage line 16a and the most-load-side low-voltage line 16f are linearly connected, and the intermediate low-voltage line 16 between the most power-side low-voltage line 16a and the most load-side low-voltage line 16f. The voltage of the terminal instrument S is acquired, the normality / abnormality of the voltage is determined, and the disconnection portion is narrowed. Finally, it is determined whether the voltage normal power transformer on the most load side and the voltage abnormal power transformer on the most power source side are adjacent to each other. It is determined that there is a possibility of disconnection in the high voltage line between the abnormal power transformer.

  FIG. 3 is an explanatory diagram of aspects of the pole transformer, the low voltage line, and the meter when the high voltage line 13 is disconnected. FIG. 3A is a branch point of the low voltage line 16b of the high voltage line 13 and the low voltage line. FIG. 3B is an explanatory diagram of the aspect of the pole transformer, the low voltage line, and the meter when a disconnection occurs at a point Fa between the branch point of 16c. FIG. FIG. 3C is an explanatory view of the aspect of the pole transformer, the low voltage line, and the meter when the disconnection occurs at the position Fb between the branch point of the line 16d and FIG. 3C is a branch point of the low voltage line 16e of the high voltage line 13. It is explanatory drawing of the aspect of a pole transformer, a low voltage line, and a meter when a disconnection generate | occur | produces in the location Fc between the branch points of the low voltage line 16f. 3A, FIG. 3B, and FIG. 3C is a low voltage that is subject to determination of normality / abnormality of voltage when the instrument S surrounded by the dotted line is searched for a broken point by the high voltage line broken point search unit 17. Line end instrument.

  As shown in FIG. 3A, if a break occurs at a location Fa between the branch point of the low-voltage line 16b and the branch point of the low-voltage line 16c in the high-voltage line 13, the high-voltage line on the load side from the break location Fa. The pole transformers 15c to 15f of the low-voltage lines 16c to 16f connected to 13 are voltage abnormal power transformers. In this case, the search for the broken line by the high-voltage line broken line searching unit 17 is performed as follows.

  First, the high-voltage line break location searching unit 17 determines whether the voltage of the instrument Sf4 at the terminal of the low-voltage line 16f at the load side is normal or abnormal, and the voltage of the instrument Sf4 at the terminal of the low-voltage line 16f is abnormal. The pole transformer 15f is a voltage abnormal power transformer. At this stage, the pole transformer 15f is the most abnormal power transformer on the power supply side. Since the pole transformer 15f of the low-voltage line 16f at the load end is a voltage abnormal power transformer, it is considered that a disconnection has occurred at a location on the power source side.

  Therefore, the voltage of the meter S at the end of the low-voltage line 16 between the low-voltage line 16a and the low-voltage line 16f on the most power source side is acquired, the normality / abnormality of the voltage is determined, and the disconnection portion is narrowed. Suppose now that the low voltage line 16c is selected as the intermediate low voltage line 16 between the low voltage line 16a and the low voltage line 16f on the most power source side, the voltage of the instrument Sc3 at the end of the low voltage line 16c is acquired, and the normality of the voltage is determined. Since the voltage of the meter Sc3 at the end of the low voltage line 16c is abnormal, the pole transformer 15c of the low voltage line 16c is used as a voltage abnormal power transformer, and the voltage abnormal power transformer on the most power source side is used as the pole transformer. Update to the device 15c. Since the pole transformer 15c of the low voltage line 16c is a voltage abnormal power transformer, it is considered that a disconnection has occurred at a location on the power source side.

  Therefore, the voltage of the meter Sb4 at the end of the low-voltage line 16b that is intermediate between the low-voltage line 16a and the low-voltage line 16c on the most power supply side is further acquired to determine whether the voltage is normal or abnormal. Since the voltage of the meter Sb4 is normal, the pole transformer 15b is a normal voltage power transformer and the voltage normal power transformer on the most load side.

  Then, it is determined whether or not the voltage normal power transformer on the most load side and the voltage abnormal power transformer on the most power source side are adjacent to each other. The most normal voltage transformer on the load side is the pole transformer 15b, the most abnormal voltage transformer on the power supply side is the pole transformer 15c, and the pole transformer 15b and the pole transformer 15c are adjacent to each other. Therefore, it is determined that there is a possibility of disconnection in the high-voltage line 13 between them.

  Next, as shown in FIG. 3B, if a disconnection occurs at a point Fb between the branch point of the low-voltage line 16c and the branch point of the low-voltage line 16d in the high-voltage line 13, the load side from the disconnection point Fb. The pole transformers 15d to 15f of the low voltage lines 16d to 16f connected to the high voltage line 13 are voltage abnormal power transformers. In this case, the search for the broken line by the high-voltage line broken line searching unit 17 is performed as follows.

  First, the high-voltage line break location searching unit 17 determines whether the voltage of the instrument Sf4 at the terminal of the low-voltage line 16f at the load side is normal or abnormal, and the voltage of the instrument Sf4 at the terminal of the low-voltage line 16f is abnormal. The pole transformer 15f is a voltage abnormal power transformer. At this stage, the pole transformer 15f is the most abnormal power transformer on the power supply side. Since the pole transformer 15f of the low-voltage line 16f at the load end is a voltage abnormal power transformer, it is considered that a disconnection has occurred at a location on the power source side.

  Therefore, the voltage of the meter S at the end of the low-voltage line 16 between the low-voltage line 16a and the low-voltage line 16f on the most power source side is acquired, the normality / abnormality of the voltage is determined, and the disconnection portion is narrowed. Suppose now that the low voltage line 16c is selected as the intermediate low voltage line 16 between the low voltage line 16a and the low voltage line 16f on the most power source side, the voltage of the instrument Sc3 at the end of the low voltage line 16c is acquired, and the normality of the voltage is determined. Since the voltage of the instrument Sc3 at the end of the low voltage line 16c is normal, the pole transformer 15c of the low voltage line 16c is a normal voltage power transformer, and the voltage normal power transformer on the most load side is the pole voltage transformer. The container 15c is used. Since the pole transformer 15c of the low-voltage line 16c is a normal voltage power transformer, it is considered that a disconnection has occurred at the load side.

  Next, it is determined whether the most normal voltage power transformer on the load side and the abnormal voltage power transformer on the most power source side are adjacent to each other. The most normal voltage transformer on the load side is the pole transformer 15c, and the most abnormal power transformer on the power supply side is the pole transformer 15f. Therefore, the pole transformer 15c and the pole transformer 15f are Are not adjacent.

  The pole transformer 15c of the low-voltage line 16c confirmed last time is a normal voltage power transformer, and it is considered that a disconnection has occurred at a location on the load side from this. The voltage of the meter S at the end of the low voltage line 16 in the middle of the low voltage line 16f is acquired to determine whether the voltage is normal or abnormal. For example, the voltage of the meter Sd4 at the end of the intermediate low-voltage line 16d is acquired to determine whether the voltage is normal or abnormal. Since the voltage of the instrument Sd4 at the end of the low-voltage line 16d is abnormal, the pole transformer 15d of the low-voltage line 16d is replaced with a voltage abnormal power transformer, and the pole transformer 15d is updated to the most abnormal voltage transformer on the power supply side. .

  Then, it is determined whether or not the voltage normal power transformer on the most load side and the voltage abnormal power transformer on the most power source side are adjacent to each other. The most normal voltage transformer on the load side is the pole transformer 15c, the most abnormal voltage transformer on the power supply side is the pole transformer 15d, and the pole transformer 15c and the pole transformer 15d are adjacent to each other. Therefore, it is determined that there is a possibility of disconnection in the high-voltage line 13 between them.

  Next, as shown in FIG. 3 (c), if a disconnection occurs at a location Fc between the branch point of the low-voltage line 16e and the branch point of the low-voltage line 16f in the high-voltage line 13, the load side from the disconnection location Fc The pole transformer 15f of the low voltage line 16f connected to the high voltage line 13 is a voltage abnormal power transformer. In this case, the search for the broken line by the high-voltage line broken line searching unit 17 is performed as follows.

  First, the high-voltage line break location searching unit 17 determines whether the voltage of the instrument Sf4 at the terminal of the low-voltage line 16f at the load side is normal or abnormal, and the voltage of the instrument Sf4 at the terminal of the low-voltage line 16f is abnormal. The pole transformer 15f is a voltage abnormal power transformer. At this stage, the pole transformer 15f is the most abnormal power transformer on the power supply side. Since the pole transformer 15f of the low-voltage line 16f at the load end is a voltage abnormal power transformer, it is considered that a disconnection has occurred at a location on the power source side.

  Therefore, the voltage of the measuring instrument S at the end of the low-voltage line 16 that is intermediate between the low-voltage line 16a and the low-voltage line 16f on the most power source side is acquired to determine whether the voltage is normal or abnormal. For example, the voltage of the meter Sc3 at the end of the intermediate low voltage line 16c is acquired to determine whether the voltage is normal or abnormal. Since the voltage of the meter Sc3 at the end of the low voltage line 16c is normal, the pole transformer 15c of the low voltage line 16c is a normal voltage power transformer, and the voltage normal power transformer on the most load side is the pole transformer 15c. And Since the pole transformer 15c of the low-voltage line 16c is a normal voltage power transformer, it is considered that a disconnection has occurred at the load side.

  Next, it is determined whether the most normal voltage power transformer on the load side and the abnormal voltage power transformer on the most power source side are adjacent to each other. The most normal voltage transformer on the load side is the pole transformer 15c, and the most abnormal power transformer on the power supply side is the pole transformer 15f. Therefore, the pole transformer 15c and the pole transformer 15f are Are not adjacent.

  The pole transformer 15c of the low-voltage line 16c confirmed last time is a normal voltage power transformer, and it is considered that a disconnection has occurred at a location on the load side from this. The voltage of the meter S at the end of the low voltage line 16 in the middle of the low voltage line 16f is acquired to determine whether the voltage is normal or abnormal. For example, the voltage of the meter Sd4 at the end of the intermediate low-voltage line 16d is acquired to determine whether the voltage is normal or abnormal. Since the voltage of the instrument Sd4 at the end of the low voltage line 16d is normal, the pole transformer 15d of the low voltage line 16d is used as a voltage normal power transformer, and the pole transformer 15d is updated to the voltage normal power transformer on the most load side. .

  Then, it is determined whether or not the voltage normal power transformer on the most load side and the voltage abnormal power transformer on the most power source side are adjacent to each other. The most normal voltage transformer on the load side is the pole transformer 15d and the most abnormal power transformer on the power supply side is the pole transformer 15f. Therefore, the pole transformer 15d and the pole transformer 15f Are not adjacent.

  Since the pole transformer 15d and the pole transformer 15f are not adjacent to each other, a disconnection occurs at the load side of the voltage abnormal power transformer of the pole transformer 15d of the low voltage line 16d previously confirmed. Therefore, the voltage of the meter Se4 at the end of the low-voltage line 16e, which is intermediate between the low-voltage line 16d and the low-voltage line 16f at the end of the load side, which have been confirmed last time is acquired to determine whether the voltage is normal or abnormal. Since the voltage of the meter Se4 at the end of the low voltage line 16e is normal, the pole transformer 15e of the low voltage line 16e is used as a voltage normal power transformer, and the pole transformer 15e is updated to the voltage normal power transformer on the most load side. .

  Then, it is determined whether or not the voltage normal power transformer on the most load side and the voltage abnormal power transformer on the most power source side are adjacent to each other. The most normal voltage transformer on the load side is the pole transformer 15e, the abnormal voltage power transformer on the most power supply side is the pole transformer 15f, and the pole transformer 15e and the pole transformer 15f are adjacent to each other. Therefore, it is determined that there is a possibility of disconnection in the high-voltage line 13 between them. As described above, the high-voltage line break location searching unit 17 determines that there is a possibility that the high-voltage line between the adjacent most load-side voltage normal power transformer and the most power-side voltage abnormal power transformer is broken. .

  By the way, when there is only one voltage abnormal power transformer determined by the high voltage line break location searching unit 17, it cannot be determined that the high voltage line 13 is broken. When there is no disconnection in the high-voltage line 13 and there is a disconnection on the low-voltage line side, the high-voltage line disconnection location search unit 17 determines that there is one voltage abnormal power transformer.

  FIG. 4 is an explanatory diagram of the aspect of the pole transformer, the low voltage line, and the meter when it is determined that there is no disconnection in the high voltage line 13 and there is one voltage abnormal power transformer by the high voltage line disconnection location search unit 17. FIG. 4 (a) is an explanatory diagram of the appearance of the pole transformer, the low-voltage line, and the state of the instrument when a disconnection occurs at the point Fd between the instrument Sf1 and the instrument Sf2 of the low-voltage line 16f at the load end. (B) is explanatory drawing of the aspect of a pole transformer, a low voltage line, and a meter at the time of a disconnection having generate | occur | produced in the place Fe of the drawing-in line of the meter Sf4 of the low voltage line 16f of the load side terminal.

  As shown in FIG. 4A, if a disconnection occurs at a point Fd between the instrument Sf1 and the instrument Sf2 of the low voltage line 16f at the load side end, the high voltage line disconnection point search unit 17 Since the voltage of the instrument Sf4 at the end of the line 16f is acquired and the normality / abnormality of the voltage is determined, even if the high-voltage line 13 is not disconnected, the pole transformer 15f of the low-voltage line 16f to which the instrument Sf4 is connected is Judge as a transformer. Further, as shown in FIG. 4B, if a break occurs at the lead-in point Fe of the meter Sf4 at the end of the low-voltage line 16f at the load side end, the high-voltage line break point searching unit 17 is similarly Since the voltage of the instrument Sf4 at the end of the load side low voltage line 16f is acquired and the normality of the voltage is judged, the pole transformer of the low voltage line 16f to which the instrument Sf4 is connected even if the high voltage line 13 is not disconnected 15f is determined as an abnormal voltage power transformer.

  Therefore, when the high voltage line break location search unit 17 determines that there is one voltage abnormal power transformer, the low voltage line break location search unit 20 disconnects the high voltage line 13 or the pole transformer 15 or the low voltage line 16. Judgment is made on the disconnection. In addition, when it is determined that there is no abnormal voltage power transformer in the high voltage line break location search unit 17, it is considered that the disconnection of the lead-in wire or the fuse on the pole has occurred, so the low voltage line break location search unit 20 Activated when the high voltage line break location search unit 17 determines that the voltage abnormal power transformer is 1 or less.

  FIG. 5 is an explanatory diagram of the instrument S in which the low-voltage line break location searching unit 20 mainly takes in data (voltage) when searching for a disconnect location on the low-voltage line side. FIG. FIG. 5B is an explanatory diagram of determination of a disconnection location when a disconnection occurs in FIG. 5, and FIG. 5B is a diagram in the case where a disconnection occurs at a location Fd between the instrument Sf1 and the instrument Sf2 of the low voltage line 16f at the load side end in the high voltage line. FIG. 5C is an explanatory diagram of the determination of the disconnection location when a disconnection occurs at the location Fe of the lead-in wire of the instrument Sf4 of the low voltage line 16f at the load side end of the high voltage line. Meter S surrounded by a dotted line in FIGS. 5 (a), 5 (b), and 5 (c) is a target of determination of normality / abnormality of voltage by searching for a broken point by low voltage line broken point searching unit 20 It is.

  As with the high voltage line break location search unit 17, the low voltage line break location search unit 20 basically calculates the voltage of the instrument S intermediate between the power source meter S and the load side meter S of the low voltage line 16. Obtain and determine whether the voltage is normal or abnormal, and narrow the disconnection. At that time, when the voltage of the meter S is normal, the meter S is a normal voltage meter, and when the voltage of the meter S is abnormal, the meter S is a voltage abnormality meter. Then, it is determined that there is a possibility of disconnection in the low voltage line between the adjacent most normal voltage measuring instrument on the load side and the most abnormal voltage measuring instrument on the power supply side.

  Further, the low voltage line disconnection location search unit 20 is provided between the most load side normal voltage power transformer and the most power side voltage abnormal power transformer when all the meters S of the low voltage line 16 are voltage abnormal meters. It is determined that the high-voltage line 13 is broken or the pole transformer 15 or the low-voltage line 16 between the pole transformer 15 and the voltage abnormality meter closest to the power source is broken. Furthermore, when there is only one voltage abnormality meter, it is determined that the low voltage line between the adjacent voltage normal meter on the most load side and the voltage abnormality meter on the most power source side is broken, the lead wire is broken, or the pole fuse is blown. To do.

  In FIG. 5A, when a disconnection occurs at a location Fc of the high voltage line 13, the high voltage disconnection location search unit 17 determines that there is one voltage abnormal power transformer, and the high voltage disconnection location search unit 17 has already been established. Therefore, it is determined that the voltage of the instrument Sf4 at the end of the low voltage line 16f is abnormal. Therefore, the low-voltage wire break location searching unit 20 acquires the voltage of the meter Sf2 that is intermediate between the meter Sf1 and the meter Sf4 on the most power supply side, and determines whether the voltage is normal or abnormal. Since the disconnection has occurred at the location Fc of the high-voltage line 13, the voltage of the meter Sf2 is abnormal, so that the meter Sf2 is a voltage abnormality meter.

  Since the meter Sf2 is a voltage abnormality meter, it is considered that there is a disconnection on the power source side from the meter Sf2. Therefore, the voltage of the most power source meter Sf1 on the power source side is obtained from the previously confirmed meter Sf2, and the normal voltage abnormality is detected. judge. Since the disconnection has occurred at the location Fc of the high-voltage line 13, the voltage of the meter Sf1 is abnormal, so that the meter Sf1 is a voltage abnormality meter. Although the voltage of the meter Sf3 is not checked, since the meter Sf3 is on the load side of the voltage abnormality meter Sf2, it can be determined that the meter Sf3 is a voltage abnormality meter. As a result, since all the meters Sf1 to Sf4 of the low voltage line 16f are voltage abnormality meters, the low voltage line disconnection location searching unit 20 is connected to the low voltage line 16f on the power source side from the meter Sf1, the pole transformer 15, or the high voltage line 13. It is determined that the wire is disconnected.

  In FIG. 5B, when a disconnection occurs at a point Fd between the instrument Sf1 and the instrument Sf2 of the low voltage line 16f at the load side end of the high voltage line, one voltage abnormality is detected by the high voltage line disconnection part search unit 17. It is determined that there is a power transformer, and the voltage of the instrument Sf4 at the end of the low voltage line 16f is already determined to be abnormal by the high voltage line disconnection location search unit 17. Similarly to the case of FIG. 5A, the low-voltage wire break location searching unit 20 acquires the voltage of the instrument Sf2 that is intermediate between the instrument Sf1 and the instrument Sf4 on the most power supply side, and determines whether the voltage is normal or abnormal. Since the disconnection has occurred between the meter Sf1 and the meter Sf2, the voltage of the meter Sf2 is abnormal. Therefore, the meter Sf2 is changed to a voltage abnormal meter, and the meter Sf2 is updated to the voltage abnormality meter on the most power supply side. To do.

  Since the meter Sf2 is a voltage abnormality meter, it is considered that there is a disconnection on the power source side from the meter Sf2. Therefore, the voltage of the most power source meter Sf1 on the power source side is obtained from the previously confirmed meter Sf2, and the normal voltage abnormality is detected. judge. Since the disconnection has occurred at the point Fd between the meter Sf1 and the meter Sf2, the voltage of the meter Sf1 is normal, so that the meter Sf1 is a voltage normal meter.

  Then, it is determined whether the most load side voltage normal meter and the most power source side voltage abnormality meter are adjacent to each other. The most normal voltage meter on the load side is the meter Sf1, the most abnormal voltage meter on the power supply side is the meter Sf2, and since the meter Sf1 and the meter Sf2 are adjacent to each other, it is determined that the low voltage line 16f between them is broken. To do.

  In FIG. 5C, when a disconnection occurs in the lead-in wire of the instrument Sf4 of the low-voltage line 16f at the load side end in the high-voltage line, the high-voltage line disconnection location search unit 17 determines that there is one voltage abnormal power transformer. The voltage of the instrument Sf4 at the end of the low voltage line 16f has already been determined to be abnormal by the high voltage line disconnection location searching unit 17. Similarly to the case of FIG. 5A, the low-voltage wire break location searching unit 20 acquires the voltage of the instrument Sf2 that is intermediate between the instrument Sf1 and the instrument Sf4 on the most power supply side, and determines whether the voltage is normal or abnormal. Since the disconnection has occurred in the lead-in wire of the meter Sf4, the voltage of the meter Sf2 is normal, so that the meter Sf2 is a voltage normal meter.

  Then, it is determined whether the most load side voltage normal meter and the most power source side voltage abnormality meter are adjacent to each other. The voltage normal meter on the most load side is the meter Sf2, the voltage abnormality meter on the most power supply side is the meter Sf4, and the meter Sf2 and the meter Sf4 are not adjacent to each other. Therefore, since it is considered that a disconnection has occurred at the load side of the voltage normal meter of the meter Sf2 confirmed last time, the meter Sf2 confirmed last time and the meter Sf4 which is the voltage normal meter on the most load side. The voltage of the intermediate instrument Sf3 is acquired to determine whether the voltage is normal or abnormal. Since the disconnection has occurred at the lead-in point Fe of the meter Sf4, the voltage of the meter Sf3 is normal, so that the meter Sf3 is a normal voltage meter and the meter Sf3 is updated to the most normal voltage meter on the load side. .

  Then, it is determined whether the most load side voltage normal meter and the most power source side voltage abnormality meter are adjacent to each other. The voltage normal meter on the most load side is the meter Sf3, the voltage abnormality meter on the most power supply side is the meter Sf4, and since the meter Sf3 and the meter Sf4 are adjacent to each other, it is determined that the low voltage line 16f between them is broken. To do. In this case, the low-voltage line 16f in between includes a lead-in line connected to the instrument Sf4. That is, since the voltage abnormality meter is only the meter Sf4 and there is a single voltage abnormality meter, it is determined that the low voltage line 16f between the meters Sf3 and Sf4, the lead-in wire of the meter Sf4, or the fuse on the column is blown.

  Next, the disconnection search of the low voltage line disconnection location search unit 20 when it is determined by the high voltage line disconnection location search unit 17 that there is no abnormal voltage power transformer will be described. FIG. 6 is an explanatory diagram of the disconnection search of the low voltage line disconnection location search unit 20 when it is determined by the high voltage line disconnection location search unit 17 that there is no abnormal voltage power transformer, and FIG. FIG. 6B is an explanatory diagram for determining the disconnection location when there is a disconnection at the location Ff between the meter Se1 and the meter Se2. FIG. 6B is a diagram when the disconnection location Fg of the instrument Se2 of the low voltage line 16e is disconnected. It is explanatory drawing of determination of a disconnection location.

  When the high voltage line break location search unit 17 determines that there is no abnormal voltage power transformer, the high voltage line 13 is not broken. Therefore, it is considered that the pole transformer 15 and the low voltage line 16 that have not been determined by the high voltage line break location search unit 17 are broken, the lead wire is broken, or the pole fuse is blown. The low-voltage wire disconnection location searching unit 20 basically acquires the voltage of the intermediate instrument S between the power-supply-side instrument S and the load-side instrument S of the low-voltage line 16 and determines whether the voltage is normal or abnormal. Narrow the point. Then, it is determined that there is a possibility of disconnection in the low voltage line between the adjacent most normal voltage measuring instrument on the load side and the most abnormal voltage measuring instrument on the power supply side. However, when it is determined that there is no abnormal voltage power transformer in the high voltage line break location search unit 17, there is no voltage abnormality meter. Therefore, all the low voltage line 16 terminals that are not determined by the high voltage line break location search unit 17. Check the voltage of S. Therefore, when there is a voltage abnormality meter S at the terminal of the low voltage line 16, it is considered that the pole transformer 15 and the low voltage line 16 are disconnected. The voltage of the intermediate instrument S is acquired, the normality / abnormality of the voltage is determined, and the disconnection portion is narrowed. Moreover, when there is no voltage abnormality meter S at the terminal of the low voltage line 16, it is considered that the lead wire is disconnected or the pole fuse is blown, so the voltage of the meter S of the unconfirmed low voltage line 16 is confirmed. In addition, the voltage of the unconfirmed meter S is confirmed in order from the end of the low voltage line 16 at the load side end in the high voltage line. A meter S surrounded by a dotted line in FIG. 6A and FIG. 6B is a meter that is a target of determination of normality / abnormality of the voltage in the search for the disconnection point by the low-voltage line disconnection point search unit 20.

  In FIG. 6A, since the high-voltage line disconnection point search unit 17 has already determined that the instrument Sf4 at the load-side low voltage line 16f end in the high-voltage line is normal, the low-voltage line disconnection point search unit 20 Check the voltage of meter S at the end of all low voltage lines 16. In FIG. 6 (a), the voltage of the meter Se4 becomes abnormal because it is disconnected at the point Ff between the meter Se1 and the meter Se2 of the low voltage line 16e. Since the meter Se4 is a voltage abnormality meter, it is considered to be a pole transformer on the power source side and a disconnection of the low voltage line from the meter Se4. Therefore, the meter Se1 and the meter Se4 on the most power source side closer to the power source side than the previously confirmed meter Se4 The voltage of the middle instrument Se2 is acquired and the normality / abnormality of the voltage is determined. Since the disconnection has occurred between the meter Se1 and the meter Se2, the voltage of the meter Se2 is abnormal, so the meter Se2 is changed to a voltage abnormality meter, and the meter Se2 is updated to the voltage abnormality meter on the most power supply side. To do.

  Since the meter Se2 is a voltage abnormality meter, it is considered that there is a disconnection on the power source side from the meter Se2. Therefore, the voltage of the most power source meter Se1 on the power source side is obtained from the previously confirmed meter Se2, and the normality of the voltage is judge. Since the disconnection has occurred at the point Ff between the meter Se1 and the meter Se2, the voltage of the meter Se1 is normal, so that the meter Se1 is a voltage normal meter.

Then, it is determined whether the most load side voltage normal meter and the most power source side voltage abnormality meter are adjacent to each other. The voltage normal meter on the most load side is the meter Se1, the voltage abnormality meter on the most power supply side is the meter Se2, and since the meter Se1 and the meter Se2 are adjacent to each other, it is determined that the low voltage line 16e between them is broken. To do.

In FIG. 6 (b), since the high-voltage line disconnection point search unit 17 has already determined that the instrument Sf4 at the load-side low-voltage line 16f end of the high-voltage line is normal, the low-voltage line disconnection point search unit 20 Check the voltage of the instrument S at the end of all low voltage lines. In FIG. 6 (b), since the disconnection is caused by the lead-in wire of the meter Se2, the voltages of the meters S at all terminals of the low-voltage line 16 are normal. Since the voltages of the meters S at the terminals of all the low-voltage lines 16 are normal, it is considered that the lead-in wire is broken or the pole fuse is blown, so the voltage of the meter S of the unidentified low-voltage line 16 is confirmed. Here, the voltage of one power-supply-side instrument Sf3 is acquired from the instrument Sf4 to determine whether the voltage is normal or abnormal. The voltage of the meter Sf3 is normal because it is not disconnected by the lead-in wire of the meter Sf3. In the same manner, the voltage of the power supply side instrument Sf2 and the instrument Sf1 is obtained from the instrument Sf3 at the end of the low voltage line 16f to determine whether the voltage is normal or abnormal. Since the wires of the instruments Sf2 and Sf1 are not disconnected, the voltages of the instruments Sf2 and Sf1 are normal . Since all of the instruments Sf1 to Sf4 of the low voltage line 16f are normal, the voltage of the instrument S of the next low voltage line 16e on the power supply side in the high voltage line is acquired to determine whether the voltage is normal or abnormal. Since the meter Se4 at the end of the low-voltage line 16e has already been determined to be normal, the voltage of the one meter Se3 on the power supply side is acquired from the meter Se4 to determine whether the voltage is normal or abnormal. Since it is not disconnected by the lead-in wire of the meter Se3, the voltage of the meter Se3 is normal. Hereinafter, similarly, the voltage of the power source side meter Se2 is obtained from the meter Se3 of the low voltage line 16e to determine whether the voltage is normal or abnormal. Here, since the instrument Se2 is disconnected at the lead-in point Fg, the voltage of the instrument Se2 becomes abnormal. Therefore, the low-voltage wire break location searching unit 20 determines that it is a lead-in wire of the instrument Se2 or a break of the pole fuse.

  As described above, the low voltage line break location searching unit 20 confirms the voltages of the meters S at all the low voltage line ends when the high voltage line break location searching unit 17 determines that there is no abnormal voltage power transformer. Search for an abnormal instrument S. And when there are a plurality of measuring instruments S that are abnormal in voltage, it is determined that the pole transformer 15 or the low voltage line 16 is disconnected, and the disconnection portion is narrowed. Only one measuring instrument S that becomes abnormal in voltage is present. In this case, it is determined that the lead-in wire of the instrument S or the fuse on the pole is broken. Moreover, when there is no instrument that causes voltage abnormality, it is determined that there is no disconnection.

  FIG. 7 shows an example of processing contents of disconnection search of the high-voltage line disconnection location search unit when the distribution system disconnection detection system according to the embodiment of the present invention is applied to a distribution line whose pole transformer is composed only of a power transformer. It is a flowchart to show.

  In FIG. 7, when the high-voltage line break location searching unit is activated, first, the positional information of the most abnormal power transformer on the power supply side and the normal voltage power transformer on the most load side is initialized (S1). This is because the high voltage line disconnection location search unit determines that there is a possibility of disconnection between the adjacent most abnormal power transformer on the power supply side and the most normal voltage power transformer on the load side. This is because these data are initialized prior to the search.

  Next, the high voltage line break location search unit performs a high voltage line break search in the procedure described based on FIG. The voltage of the dynamometer at the end of the low-voltage line at the load-side end of the high-voltage main line and branch line is confirmed (S2). As described above, in order to efficiently perform the disconnection search, the voltage of the dynamometer at the end of the low voltage line at the load side is acquired to determine whether the voltage is normal or abnormal, and the voltage of the dynamometer at the end of the low voltage line is sequentially acquired to obtain the voltage. The normality / abnormality is determined.

  That is, it is determined whether or not the voltage of the dynamometer at the low-voltage line at the load-side end of the high-voltage main line and branch line is normal (S3). Is normal, it is determined whether or not there is an unidentified low-voltage line power meter at the load-side end of the high-voltage main line or branch line (S4), and an unidentified low-voltage line end at the load-side end. If there is a dynamometer, the process returns to step S2. If it is determined in step S4 that there is no unidentified low-voltage line terminal dynamometer at the load-side end of the high-voltage main line or branch line, the power-meter at the low-voltage line end of the load-side end of all high-voltage line main lines or branch lines Since the voltage is normal, the process proceeds to a low-voltage line search process in a low-voltage line disconnection location search unit that mainly searches for a disconnection location on the low-voltage line side (S5).

  If it is determined in step S3 that the voltage of the dynamometer at the end of the low voltage line at the load side is abnormal, the position information of the most abnormal power transformer on the power supply side or the normal voltage power transformer on the load side is updated. (S6). In step S6, at the stage when it is first determined that the voltage of the power meter at the end of the low-voltage line is abnormal, there is no information on the normal voltage power transformer, so the position information of the voltage normal power transformer on the most load side is updated. Is not done. On the other hand, when it is first determined that the voltage of the dynamometer at the end of the low voltage line is abnormal, the power transformer of the low voltage line at the end of the load side to which the dynamometer at the end of the low voltage line is connected is an abnormal voltage power transformer. Therefore, the position information is updated with the load-side low-voltage line power transformer connected to the low-voltage line terminal power meter as the most abnormal voltage transformer on the power supply side.

  Then, it is determined whether the most abnormal voltage power transformer on the power supply side and the normal voltage power transformer on the most load side are adjacent positions (S7). At the stage when it is first determined that the voltage of the dynamometer at the end of the low-voltage line is abnormal, there is no information on the normal voltage power transformer, so the process proceeds to step S8.

  In step S8, it is determined whether or not the voltage of the dynamometer at the end of the low-voltage line at the previous confirmation position is normal (S8). When the voltage of the dynamometer at the end of the low-voltage line is first determined to be abnormal, the voltage of the dynamometer at the end of the low-voltage line at the previous confirmation position is abnormal, so the process proceeds to step S9. In step S9, the voltage of the dynamometer at the end of the low-voltage line that is intermediate between the most power supply side position and the previous confirmation position is confirmed (S9). And it returns to step S6 and performs the process after step S6.

  When the voltage of the dynamometer at the end of the low voltage line between the power supply side position and the previous confirmed position is normal in the voltage confirmation processing in step S9, the power transformer of the low voltage line to which the dynamometer is connected is The position information is updated as the voltage normal power transformer on the most load side (S6). Then, it is determined whether or not the most abnormal power transformer on the power source side and the normal voltage power transformer on the most load side are adjacent positions (S7). It is determined whether the voltage of the instrument is normal (S8). Since the voltage of the dynamometer at the end of the low-voltage line at the previous confirmation position is normal, the process proceeds to step S10, and the voltage of the dynamometer at the end of the low-voltage line between the load-side end position and the previous confirmation position is confirmed (S10). And it returns to step S6 and performs the process after step S6.

  If it is determined in step S7 that the most abnormal voltage power transformer on the power supply side and the normal voltage power transformer on the most load side are adjacent positions, it is determined whether there are a plurality of abnormal voltage power transformers. If it is determined (S11) and there are a plurality of abnormal voltage power transformers, it is a disconnection of the high voltage line between the adjacent most abnormal power transformer on the power supply side and the normal voltage power transformer on the most load side. (S12). On the other hand, when it is determined in step S11 that there are not a plurality of voltage abnormal power transformers, the process proceeds to low-voltage line search processing in the low-voltage line disconnection location search unit that mainly searches for a disconnection location on the low-voltage line side. (S5).

  If it is determined in step S11 that there are not a plurality of abnormal voltage power transformers, the low voltage line search process is performed as described above when there is only one abnormal voltage power transformer. This is because it may not be determined that there is a disconnection in the high voltage line.

  FIG. 8 shows an example of processing contents of disconnection search of the low voltage line disconnection location search unit when the distribution system disconnection detection system according to the embodiment of the present invention is applied to a distribution line whose pole transformer is composed only of a power transformer. It is a flowchart to show. In the low-voltage line break location searching unit, first, the voltage of the dynamometer at the low-voltage line end confirmed by the high-voltage line break location searching unit is taken in (T1). Then, the low-voltage line break location searching unit performs a low-voltage line break search according to the procedure described with reference to FIGS. 5 and 6.

  First, it is determined whether or not the voltages of the dynamometers at the end of the low-voltage line at the load side end of the high-voltage main line and branch line are all normal (T2). When the voltage of the dynamometer at the end of the low-voltage line at the load side end of the high-voltage main line and branch line is all normal, check the unidentified dynamometer at the end of the low-voltage line (T3). Is normal (T4), and when the voltages of all the low-voltage line dynamometers are normal, the unidentified low-voltage line dynamometer is checked (T5). It is determined whether or not the voltages of all dynamometers on the low-voltage line are normal (T6). If the voltages on all dynamometers on the low-voltage line are normal, it is determined that there is no disconnection (T7). If the voltage of the dynamometer of the low-voltage line is abnormal, it is determined that the lead-in wire to which the abnormal voltage dynamometer is connected or the pole fuse is blown (T8). This is the case of FIG. 6B, and since the voltages of the meters S at the terminals of all the low-voltage lines 16 are normal, it is considered that the lead-in wire is broken or the pole fuse is blown. This corresponds to checking the voltage of the meter S.

  If the voltage of the dynamometer at the end of the low-voltage line is abnormal in the determinations of step T2 and step T4, the position information of the most abnormal voltage dynamometer on the power supply side or the normal dynamometer on the load side is updated (T9). In step T9, when it is first determined that the voltage of the dynamometer is abnormal, there is no information on the normal voltage dynamometer, so the position information of the voltage normal dynamometer on the most load side is not updated. On the other hand, when it is first determined that the voltage of the dynamometer is abnormal, the dynamometer updates the position information as the voltage abnormal dynamometer on the most power supply side (T9).

  Then, it is determined whether or not the voltage abnormality meter on the most power source side and the voltage normal power meter on the most load side are adjacent positions (T10). If it is not an adjacent position, the process proceeds to step T11.

  In step T11, it is determined whether or not the dynamometer at the previous confirmation position is normal in voltage. At the stage when it is first determined that the voltage of the dynamometer is abnormal, there is no information on the normal voltage dynamometer, so the process proceeds to step T12. In Step T12, the voltage of the dynamometer intermediate between the power supply side position and the previous confirmation position is confirmed. Then, it is determined whether or not the voltages of all the dynamometers on the low-voltage line are abnormal (T13). If the voltages on all the dynamometers on the low-voltage line are not abnormal, the process returns to step T9, and the processes after step T9 are performed. .

  Here, when it is determined in the voltage confirmation process in step T12 that the voltage of the dynamometer between the most power supply side position and the previous confirmation position is normal, the voltages of all dynamometers on the low-voltage line are abnormal. Therefore, the process returns to step T9 by the determination in step T13, but in step T9, the position information is updated with the intermediate power meter as the voltage normal power meter on the most load side (T9).

  Then, when the position information of the voltage normal dynamometer on the most load side is updated in step T9, it is determined whether or not the voltage abnormal dynamometer on the power supply side and the voltage normal dynamometer on the most load side are adjacent positions. If it is not the adjacent position (T10), it is determined whether or not the dynamometer at the previous confirmation position has a normal voltage (T11).

  Next, if it is determined in step T11 that the voltage of the dynamometer at the previous confirmation position is normal, the process proceeds to step T14 to confirm the voltage of the dynamometer intermediate between the load-side end position and the previous confirmation position ( T14). And it returns to step T9 and performs the process after step T9.

  If it is determined in step T10 that the most abnormal voltage dynamometer on the power supply side and the normal dynamometer on the most load side are adjacent positions, it is determined whether there are a plurality of abnormal voltage dynamometers. If there are a plurality of abnormal voltage dynamometers, it is determined that the low voltage line is disconnected (T16). That is, it is determined that this is a disconnection in the low-voltage line between the adjacent most abnormal voltage dynamometer on the power supply side and normal dynamometer on the most load side. This is the case of FIGS. 5B and 6A. On the other hand, when it is determined in step T15 that there are not a plurality of abnormal voltage dynamometers, either the low voltage line between the most abnormal voltage motive power instrument on the power supply side and the normal dynamometer on the most load side or the abnormal voltage motive power thereof. It is determined that the lead-in wire to which the instrument is connected is broken or the fuse on the column is blown (T8). This is the case of FIG.

  If the voltage of all dynamometers on the low-voltage line is abnormal in the determination of step T13, it is determined that the power-side low-voltage line, pole transformer, or high-voltage line is disconnected from the most power-side dynamometer. (T17). This is the case shown in FIG. 5A, and FIG. 5A shows the case where the high-voltage line is disconnected.

  Next, the case where the distribution system disconnection detection system according to the embodiment of the present invention is applied to a distribution line in which the pole transformer includes only the light transformer will be described. As described above, when the pole transformer is a light transformer, unlike the power transformer, the light transformer takes one line from the three phases of the high voltage line to the low voltage side, and the low voltage line on the low voltage side. Is supplied with power between one line.

  FIG. 9 is a schematic explanatory diagram of the disconnection search of the high-voltage line disconnection location search unit when the distribution system disconnection detection system according to the embodiment of the present invention is applied to a distribution line in which the pole transformer includes only the light transformer. FIG. 9A is an explanatory diagram when a disconnection occurs at the T-phase location F1 of the three-phase RST of the high-voltage line 13, and FIG. 9B is an R-phase of the three-phase RST of the high-voltage line 13. FIG. 9C is an explanatory diagram when a disconnection occurs in the S-phase portion F3 of the three-phase RST of the high-voltage line 13. FIG. In addition, in FIG. 9, illustration of a distribution transformer, a circuit breaker, a switch, a high voltage line branch line, and a low voltage line is omitted. In FIG. 9, pole transformers 15 a and 15 d take out one-line RS from the three-phase RST of the high-voltage line 13, and pole transformers 15 b and 15 e take the one-line RT from the three-phase RST of the high-voltage line 13. The take-out and pole transformers 15c and 15f show the case where the one-line ST is taken out from the three-phase RST of the high-voltage line 13.

  As shown in FIG. 9A, when a disconnection occurs at the T-phase location F1, the pole transformers 15e and 15f on the load side from the disconnection location F1 become voltage abnormal lamp transformers. This is because the pole transformers 15e and 15f are connected to the T phase where the disconnection has occurred. On the other hand, the pole transformers 15a to 15d on the power supply side from the disconnection point F1 are voltage normal lamp transformers. This is because the pole transformers 15a to 15d are located on the power supply side from the portion F1 where the disconnection occurs. In the case of FIG. 9 (a), there is a possibility that a disconnection may have occurred between the adjacent most normal voltage transformer 15d on the load side and the most abnormal voltage transformer 15e on the power supply side. Can be judged.

As shown in FIG. 9B, when disconnection occurs at the R-phase location F2, the pole transformers 15d and 15e on the load side from the disconnection location F2 become voltage abnormal lamp transformers. The transformer 15f does not become a voltage abnormal light transformer. This is because the pole transformers 15d and 15e are connected to the R phase where the disconnection has occurred, but the pole transformer 15f is not connected to the R phase where the disconnection has occurred. Thus, when the pole transformer 15 is a light transformer, the low-voltage line light meter at the load end is normal, and the pole transformer 15f at the load end is a normal voltage light transformer. However, the pole transformers 15e and 15d on the power supply side may be abnormal voltage lamp transformers. This is because the light transformer takes out one line from the three phases of the high voltage line to the low voltage side, and power is supplied to the low voltage line on the low voltage side from one line, so it is connected to the phase where the disconnection occurred. This is because, in the case of no electric load, even a pole transformer on the load side from the disconnection occurrence point becomes a normal voltage electric light transformer.

  In the case of FIG. 9B, since there is an adjacent most normal voltage transformer 15c on the load side and an abnormal voltage transformer 15d on the most power supply side, there may be a disconnection between them. Can be judged. Even if the pole transformer 15f at the end of the load side is a normal voltage light transformer, there is a possibility that a disconnection point has occurred on the power source side, so in the distribution line to which the light transformer is connected, Even if the pole transformer 15f at the load side end is a normal voltage light transformer, it is necessary to use search logic for determining whether or not an abnormal voltage light transformer exists on the power source side.

  Next, as shown in FIG. 9 (c), when a disconnection occurs at the S-phase point F3, the pole transformers 15c, 15d, 15f on the load side from the disconnection point F3 are the abnormal voltage lamp transformers. However, the pole transformer 15e is not a voltage abnormal light transformer. This is because the pole transformers 15c, 15d and 15f are connected to the S phase where the disconnection has occurred, but the pole transformer 15e is not connected to the S phase where the disconnection has occurred.

In the case of FIG. 9C, even if the most adjacent load-side voltage normal light transformer 15e and the most power-side voltage abnormal light transformer 15f are detected first, the most load adjacent to the power supply side is detected. Since there is a normal voltage transformer 15b on the side and an abnormal voltage transformer 15c on the most power source side, it is necessary to use search logic for determining whether or not there is an abnormal voltage transformer on the power source side. Become.

  Therefore, in the case of a distribution line to which only a light transformer is connected as a pole transformer, even if the pole transformer 15f at the load side end is a normal voltage lamp transformer, a voltage abnormal lamp is provided on the power source side. In order to determine whether or not a transformer exists, the voltage of the electric light meter at the end of the low voltage line is checked in order from the load side end. Further, even when the adjacent most normal voltage transformer 15b on the load side and the most abnormal voltage transformer 15c on the power supply side are detected, whether or not there is an abnormal voltage transformer on the power supply side. Therefore, the voltage of the electric light meter at the end of the low voltage line on the power supply side from the normal voltage electric light transformer is checked.

  FIG. 10 shows an example of processing contents of disconnection search of the high-voltage line disconnection location search unit when the distribution system disconnection detection system according to the embodiment of the present invention is applied to a distribution line in which the pole transformer is composed only of the light transformer. It is a flowchart to show. In contrast to steps S1 to S12 of the process of searching for a disconnection of a distribution line in which the pole transformer shown in FIG. 7 is composed only of a power transformer, the corresponding steps are set to steps U1 to U12, and the power transformer is a light transformer, The power meter is an electric light meter. Instead of steps S2 to S4 for checking the voltage of the low-voltage line dynamometer at the load-side end of the high-voltage main line and branch line, the voltage of the electric light meter at the low-voltage line end of the high-voltage main line and branch line is changed to the load side. Steps U2A to U4A to be checked in order, and after the step U12 corresponding to step S12 that determines that the high-voltage line is disconnected, the voltage of the electric light meter at the end of the low-voltage line on the power supply side from the normal voltage light transformer Steps U13A to U15A for confirming the above are additionally provided.

  In FIG. 10, when the high voltage line disconnection location search unit is activated, first, the position information of the most abnormal voltage transformer on the power supply side and the normal voltage transformer on the most load side is initialized (U1). This is because the high voltage line disconnection location search unit determines that there is a possibility of disconnection between the adjacent most abnormal voltage transformer on the power supply side and the most normal voltage transformer on the load side. This is because these data are initialized prior to the search.

  Next, the high-voltage line break location search unit checks the voltage of the electric light meter at the end of the high-voltage main line and the low-voltage line of the branch line in order from the load side (U2A). As described above, in the case of a distribution line in which only a light transformer is connected as a pole transformer, even if the pole transformer 15f at the load side end is a normal voltage light transformer, This is for searching for an abnormal voltage lamp transformer on the power supply side.

  That is, it is determined whether the voltage of the electric light meter at the end of the high voltage main line and the low voltage line of the branch line is normal (U3A). If the voltage of the electric light meter is normal, the high voltage main line and the branch line are not confirmed. It is determined whether or not there is a light meter at the end of the low-voltage line (U4A). If there is an unconfirmed light meter, the process returns to step U2A. If it is determined in step U4A that there is no unidentified electric light meter, the voltages of the electric light meters at the ends of all the low-voltage lines of the high-voltage main line and branch line are normal. The process proceeds to a low-voltage line search process in the broken line location search unit (U5).

If it is determined in step U3A that the voltage of the high-voltage main line and branch line lamp meters is abnormal, the position information of the most abnormal voltage transformer on the power supply side or the normal voltage transformer on the most load side is updated. (U6). In step U6, at the stage when it is first determined that the voltage of the electric light meter is abnormal, there is no information on the voltage normal light transformer, so the position information of the voltage normal light transformer on the most load side is not updated. . Then, it is determined whether the most abnormal voltage transformer on the power supply side and the normal voltage transformer on the most load side are adjacent positions (U7). When it is first determined that the voltage of the electric light meter is abnormal, there is no information on the normal voltage electric light transformer, so the process proceeds to Step U8.

  In step U8, it is determined whether or not the voltage meter at the end of the low-voltage line at the previous confirmation position is normal (U8). At the stage when it is first determined that the voltage of the electric light meter at the low-voltage line terminal is abnormal, the electric light meter at the low-voltage line terminal at the previous confirmation position is abnormal in voltage, so the process proceeds to step U9. In step U9, the voltage of the electric light meter at the end of the low-voltage line that is intermediate between the most power supply side position and the previous confirmation position is confirmed (U9). And it returns to step U6 and performs the process below step U6.

  When the voltage of the electric light meter at the end of the low voltage line between the most power supply side position and the previous confirmation position is normal in the voltage confirmation processing at step U9, the electric light transformer is the most normal voltage transformer on the load side. Then, the position information is updated (U6). Then, it is determined whether the most abnormal voltage transformer on the power supply side and the normal lamp transformer on the most load side are adjacent positions (U7). If not, the lamp at the end of the low voltage line at the previous confirmation position is determined. The instrument determines whether the voltage is normal (U8). Since the voltage at the end of the low-voltage line at the previous confirmation position is normal, the process proceeds to step U10, where the voltage at the end of the low-voltage line between the load-side end position and the previous confirmation position is confirmed (U10). And it returns to step U6 and performs the process below step U6.

  If it is determined in step U7 that the most abnormal voltage transformer on the power source side and the normal voltage transformer on the most load side are adjacent positions, it is determined whether there are a plurality of abnormal voltage lamp transformers. Judgment (U11), when there are a plurality of abnormal voltage lamp transformers, it is a disconnection of the high voltage line between the adjacent abnormal voltage lamp transformer on the most power supply side and the most normal voltage transformer on the load side (U12). On the other hand, when it is determined in step U11 that there are not a plurality of abnormal voltage lamp transformers, the process proceeds to a low-voltage line search process in the low-voltage line disconnection location search unit that searches for a disconnection location in the low-voltage line (U5). ).

  If it is determined in step U11 that there are not a plurality of abnormal voltage lamp transformers, the low voltage line search process is mainly performed when the number of abnormal voltage lamp transformers is one as described above. This is because there is a possibility of disconnection of the pole transformer on the line side or the low voltage line, and it may not be determined that the high voltage line is disconnected.

  Next, the voltage of the electric light meter at the end of the low-voltage line on the power supply side from the normal voltage electric light transformer is confirmed (U13A). That is, it is determined whether or not the voltage of the electric light meter at the end of the low-voltage line on the power supply side from the normal voltage light transformer is abnormal (U14A), and if abnormal, the process returns to step U9 to move from the normal voltage light transformer to the power supply side. Search for another adjacent most load normal voltage transformer and most power abnormal voltage transformer that are present. If it is determined in step U14A that the voltage of the lamp instrument at the end of the low-voltage line on the power supply side from the normal voltage light transformer is normal, the voltage normal light transformer on the most load side and the power supply side that are most recently searched for. A high-voltage disconnection section is determined assuming that a disconnection has occurred between the voltage abnormal electric light transformer (U15A).

  FIG. 11 shows an example of processing content of disconnection search of the low voltage line disconnection location search unit when the distribution system disconnection detection system according to the embodiment of the present invention is applied to a distribution line in which the pole transformer is composed only of the light transformer. It is a flowchart to show. The steps corresponding to steps T1 to T17 of the distribution line disconnection search process in which the pole transformer shown in FIG. 8 is composed only of the power transformer are set as steps V1 to V17, and the power meter is an electric light meter. The processing contents of steps T1 to T17 shown in FIG. 8 and the processing contents of steps V1 to V17 shown in FIG. 11 are substantially the same.

  In FIG. 11, the low voltage line break location searching unit first takes in the voltage of the electric light meter at the end of the low voltage line confirmed by the high voltage line break location searching unit (V <b> 1). Then, the low-voltage line break location searching unit performs a low-voltage line break search according to the procedure described with reference to FIGS. 5 and 6.

  First, it is determined whether or not all the voltages of the electric light meters at the low-voltage line terminals at the load-side terminals of the high-voltage main line and branch line are normal (V2). When the voltage of the electric light meter at the end of the low-voltage line at the load side end of the high-voltage main line and branch line is normal, check the unidentified electric light meter at the end of the low-voltage line (V3). Is determined to be normal (V4), and when the voltage of all the low-voltage line lighting instruments is normal, the unidentified low-voltage line lighting instrument is confirmed (V5). It is determined whether or not the voltages of all the electric light meters on the low voltage line are normal (V6). If the voltages of all the electric light meters on the low voltage line are normal, it is determined that there is no disconnection (V7). When the voltage of the low-voltage line electric light meter is abnormal, it is determined that the lead-in wire to which the voltage abnormal electric light meter is connected is broken or the pole fuse is blown (V8). This is the case of FIG. 6B, and since the voltages of the meters S at the terminals of all the low-voltage lines 16 are normal, it is considered that the lead-in wire is broken or the pole fuse is blown. This corresponds to checking the voltage of the meter S.

  If the voltage of the low-voltage line end lamp instrument is abnormal in the determinations at step V2 and step V4, the position information of the most abnormal voltage lamp instrument on the power supply side or the normal voltage lamp instrument on the load side is updated (V9). In step V9, at the stage when it is first determined that the voltage of the electric lamp instrument is abnormal, there is no information on the normal voltage electric lamp instrument, so the position information of the voltage normal electric lamp instrument on the most load side is not updated. On the other hand, when it is first determined that the voltage of the electric light meter is abnormal, the electric light meter updates the position information as the voltage abnormal electric light meter on the power supply side (V9).

  Then, it is determined whether or not the most abnormal voltage instrument on the power supply side and the normal lamp instrument on the most load side are adjacent positions (V10). If it is not an adjacent position, the process proceeds to step V11.

  In Step V11, it is determined whether or not the electric light meter at the previous confirmation position is normal. At the stage when it is first determined that the voltage of the electric light meter is abnormal, there is no information on the normal voltage electric light meter, so the process proceeds to Step V12. In Step V12, the voltage of the electric light meter intermediate between the most power supply side position and the previous confirmation position is confirmed. Then, it is determined whether or not the voltages of all the electric light meters on the low-voltage line are abnormal (V13). If the voltages of all the electric light meters on the low-voltage line are not abnormal, the process returns to step V9, and the processing after step V9 is performed. .

  Here, in the voltage confirmation process in step V12, when it is determined that the voltage of the lighting instrument intermediate between the most power supply side position and the previous confirmation position is normal, the voltages of all the lighting instruments on the low voltage line are abnormal. Therefore, the process returns to step V9 by the determination in step V13, but in step V9, the position information is updated with the intermediate lamp instrument as the voltage normal lamp instrument on the most load side (V9).

  In step V9, when the position information of the most normal voltage lighting instrument on the load side is updated, it is determined whether or not the abnormal voltage lighting instrument on the power supply side and the normal voltage lighting instrument on the most load side are adjacent positions. If it is not an adjacent position (V10), it is determined whether or not the voltage meter at the previous confirmation position is normal (V11).

  Next, if it is determined in step V11 that the voltage of the electric light instrument at the previous confirmation position is normal, the process proceeds to step V14, and the voltage of the electric light instrument intermediate between the load-side end position and the previous confirmation position is confirmed ( V14). Then, the process returns to Step V9, and the processes after Step V9 are performed.

  When it is determined in step V10 that the most abnormal power lamp instrument on the power supply side and the normal lamp instrument on the most load side are adjacent positions, it is determined whether there are a plurality of abnormal voltage lamp instruments. If there are a plurality of abnormal voltage lamps (V15), it is determined that the low voltage line is disconnected (V16). That is, it is determined that this is a disconnection in the low-voltage line between the adjacent most abnormal voltage lamp on the power supply side and the most normal voltage lamp on the load side. This is the case of FIGS. 5B and 6A. On the other hand, if it is determined in step V15 that there are not a plurality of abnormal voltage lamps, the low voltage line between the most abnormal voltage lamp on the power source side and the normal voltage lamp on the most load side, or the abnormal voltage lamp It is determined that the lead-in wire to which the instrument is connected is broken or the fuse on the column is blown (V8). This is the case of FIG.

  Further, if the voltage of all the electric light meters on the low-voltage line is abnormal in the determination at step V13, it is determined that the low-voltage line, pole transformer, or high-voltage line on the power source side is disconnected from the most power-side electric light meter. (V17). This is the case shown in FIG. 5A, and FIG. 5A shows the case where the high-voltage line is disconnected.

  Next, the distribution system disconnection detection system according to the embodiment of the present invention will be described in the case where the pole transformer is a distribution line in which a power transformer and a light transformer are mixed. When the pole transformer is a distribution line in which a power transformer and a light transformer are mixed, a disconnection search is performed between the power transformers, and then a disconnection search is performed between the light transformers.

  FIG. 12 shows power by the high-voltage line break location search unit when the distribution line break detection system according to the embodiment of the present invention is applied to a distribution line in which a pole transformer is a mixture of a power transformer and a light transformer. It is a flowchart which shows an example of the processing content of the disconnection search between transformers. In contrast to steps S1 to S12 in the process of searching for disconnection of a distribution line in which the pole transformer shown in FIG. 7 is composed only of a power transformer, an electric lamp is connected to the load side from the power transformer at the end of the load side after step S4. Step S14A for determining whether or not there is a transformer and Step S14A for performing the process of searching for a light transformer (a) when there is a light transformer on the load side from the power transformer at the end of the load side are added. Step S15A for determining whether or not there is a light transformer in the adjacent section of the power transformer between Step S7 and Step S11 and if there is a light transformer in the adjacent section of the power transformer Step S16A for performing the process of transformer search (b) is additionally provided. The same processing contents as those in FIG. 7 are denoted by the same reference numerals, and redundant description is omitted.

  In FIG. 12, when the voltage of the dynamometer at the end of the low-voltage line at the load-side end of the high-voltage main line and branch line is normal in the determination of step S3, It is determined whether or not there is a dynamometer at the end of the line (S4), and if there is an unidentified low-voltage line dynamometer at the load side end of the high-voltage main line or branch line, the process returns to step S2. On the other hand, if it is determined in step S4 that there is no unidentified low-voltage line power meter at the load-side end of the high-voltage main line or branch line, is there a light transformer on the load side from the power transformer at the load-side end? If it is determined (S13A) and it is determined that there is no light transformer on the load side from the power transformer at the end of the load side, the process proceeds to a low-voltage line search process in the low-voltage line disconnection location search unit (S5). ). The low-voltage line search process in step S5 is the same as the process shown in FIG.

  If it is determined in step S13A that there is a light transformer on the load side from the power transformer on the load side end, the search for the light transformer (a) is performed (S14A), Search for disconnection of the light transformer existing on the load side from the power transformer. The processing content of the search for the electric transformer (a) will be described later.

  On the other hand, if it is determined in step S7 that the most abnormal power transformer on the power supply side and the normal voltage power transformer on the most load side are adjacent positions, the light transformer is located in the adjacent section of the power transformer. If there is no lamp transformer in the adjacent section of the power transformer, it is determined whether there are a plurality of abnormal voltage power transformers (S11). When there are a plurality of transformers, it is determined that the high-voltage line is disconnected between the adjacent most abnormal power transformer on the power supply side and normal voltage power transformer on the most load side (S12). If it is determined in step S11 that there are not a plurality of abnormal voltage power transformers, the process proceeds to a low-voltage line search process in the low-voltage line disconnection part search unit that searches for a disconnection part in the low-voltage line (S5). ). The low-voltage line search process in step S5 is the same as the process shown in FIG.

  If it is determined in step S15A that there is a light transformer in the adjacent section of the power transformer, search for the light transformer (b) is performed (S16A), and the light in the adjacent section of the power transformer is processed. Search for transformer disconnection. The processing content of the electric transformer search (b) will be described later.

  FIG. 13 is a flowchart showing an example of the processing content of the search for the electric transformer (a) in FIG. For the steps U1 to U15A of the content of the disconnection search process of the distribution line in which the pole transformer shown in FIG. 10 is composed only of the light transformer, the voltage of the light meter at the end of the high voltage main line and the low voltage line of the branch line is loaded Instead of step U2A for confirming in turn, step U2B for confirming the voltage of the light meter at the low-voltage line end of the light transformer to the power transformer at the load-side end of the high-voltage main line and branch line in order from the load side. Instead of step U3A for determining whether or not the voltage of the low-voltage line terminal of the high-voltage main line and branch line is normal, the voltage of the low-voltage line terminal of the light transformer up to the power transformer at the load end is determined. Step U3B is used to determine whether the voltage is normal. The same processing contents as those in FIG. 10 are denoted by the same reference numerals, and redundant description is omitted.

  The search (a) for the light transformer in FIG. 12 is a search for a break in the light transformer when the high voltage line break location search unit 17 determines that there is a light transformer on the load side from the power transformer at the end of the load side. Therefore, the voltage of the electric light meter at the end of the low voltage line of the electric light transformer from the load side to the power transformer at the end of the load side is confirmed in order (U2B).

  That is, in order from the load side, it is determined whether or not the voltage of the low-voltage line end of the light transformer to the power transformer at the end of the load side is normal (U3B). If it is normal, it is determined whether or not there is an unconfirmed low-voltage line end electric light meter (U4A), and if there is an unconfirmed low-pressure line end electric light meter, the process returns to step U2B. If it is determined in step U4A that there are no unidentified low-voltage line terminal lighting instruments, the voltage of all low-voltage line terminal lighting instruments is normal, so the low-voltage line disconnection point is searched for a disconnection point on the low-voltage line. The process proceeds to a low-pressure line search process in the search unit (U5). The low-voltage line search process in step U5 is the same as the process shown in FIG.

  FIG. 14 is a flowchart showing an example of the processing content of the search for the electric transformer (b) in FIG. For the steps U1 to U15A of the content of the disconnection search process of the distribution line in which the pole transformer shown in FIG. 10 is composed only of the light transformer, the voltage of the light meter at the end of the high voltage main line and the low voltage line of the branch line is loaded Instead of step U2A for confirming in turn, step U2C for confirming the voltage of the light meter at the end of the low voltage line of the light transformer between adjacent power transformers in order from the load side is used. Instead of step U3A for determining whether or not the voltage at the line end electric light meter is normal, step U3C for determining whether or not the voltage at the low voltage line end of the light transformer between adjacent power transformers is normal. It is what. The same processing contents as those in FIG. The same processing contents as those in FIG.

  The search (b) for the light transformer in FIG. 12 is a process of searching for a break in the light transformer when the high voltage line break location search unit 17 determines that there is a light transformer between adjacent power transformers. Therefore, the voltage of the electric light meter at the end of the low voltage line of the electric light transformer between the adjacent power transformers is confirmed in order from the load side (U2C).

  That is, it is determined whether or not the voltage of the low-voltage line end of the light transformer between the adjacent power transformers is normal (U3C). It is determined whether there is an electric light meter at the end of the low-voltage line (U4A), and if there is an unidentified electric light meter at the end of the low-pressure line, the process returns to step U2A. If it is determined in step U4A that there are no unidentified low-voltage line terminal lighting instruments, the voltage of all low-voltage line terminal lighting instruments is normal, so the low-voltage line disconnection point is searched for a disconnection point on the low-voltage line. The process proceeds to a low-pressure line search process in the search unit (U5). The low-voltage line search process in step U5 is the same as the process shown in FIG.

  In this way, for distribution lines in which pole transformers are a mixture of power transformers and light transformers, first search for disconnection between power transformers, and then between power transformers. Search for disconnection. In the search for disconnection between power transformers, if there is a light transformer on the load side from the power transformer at the end of the load side, search for the light transformer (a) is performed, and within the adjacent section of the power transformer If it is determined that there is an electric light transformer, the process of searching for an electric light transformer (b) is performed to search for a disconnection point.

  Here, when the voltage of the instrument S cannot be received, the high voltage disconnection location search unit 17 and the low voltage disconnection location search unit 20 perform disconnection search processing by determining that the voltage of the instrument S is abnormal. That is, as a case where the voltage of the meter S cannot be received, a case where the meter itself becomes unable to respond is considered. However, a disconnection occurs in the low-voltage side distribution line, and the voltage of the low-voltage side distribution line becomes a predetermined value or less. Sometimes the instrument will not be able to transmit the measured voltage. Therefore, in the embodiment of the present invention, when the voltage of the meter S cannot be received, the disconnection search process is performed by determining that the voltage of the meter S is abnormal.

  Further, the high voltage line disconnection location search unit 17 is activated when a disconnection detection request is input when there is a disconnection sign in the distribution line. The disconnection indication may be a case where there is a report from a customer or a typhoon or lightning. In addition to the occurrence of natural phenomena such as, when the instrument S is monitored by a ring number, when the voltage of the instrument S monitored by the ring number is abnormal, the protection relay of the distribution substation is activated, built in the switch 14 When the sensor detects a voltage abnormality, a disconnection detection request may be input to the high-voltage line disconnection location search unit 17 assuming that a disconnection sign has occurred.

  According to the embodiment of the present invention, the only information necessary for searching for the disconnection location is the voltage measured by the meter S, and the disconnection search logic can determine the disconnection location using the voltage. There is no need to manage the connection phase. In addition, the voltage measured by the instrument S is transmitted to the high voltage line break location search unit 17 and the low voltage line break location search unit 20, and the high voltage line break location search unit 17 and the low voltage line break location search unit 20 perform the disconnection search process. Therefore, the meter S only needs to transmit the measured voltage, the amount of data transmitted from the meter S to the high voltage line break location search unit 17 and the low voltage line break location search unit 20 can be reduced, and the performance of the meter S can be improved. There is no need to secure a large communication capacity.

  In addition, since the high voltage line break location search unit 17 and the low voltage line break location search unit 20 are activated only when a disconnection detection request is input to the high voltage line break location search unit 17 because a disconnection sign has occurred, the instrument side Therefore, there is no need for judgment processing and call processing in the above, and it is not necessary to improve the performance of the instrument S or to provide a high-performance communication function. Therefore, it is possible to detect disconnection with the specifications of current general instruments (smart meters) and communication equipment, and it is possible to construct a distribution system disconnection detection system with inexpensive equipment.

  Although the embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 11 ... Distribution transformer, 12 ... Circuit breaker, 13 ... High voltage line, 14 ... Switch, 15 ... Pillar transformer, 16 ... Low voltage line, 17 ... High voltage line disconnection part search part, 18 ... Data receiving part, 19 ... Output device, 20 ... low-voltage wire disconnection location search unit

Claims (5)

The power supply side of the distribution line having a plurality of low voltage lines connected from the high voltage line connected to the distribution transformer via the pole transformer is the power source side and the power receiving side is the load side, and from the high voltage line In the distribution system disconnection detection system for detecting disconnection of the high-voltage line and the low-voltage line of the distribution system that supplies power to the low-voltage line,
An instrument having a function of measuring at least a voltage value and transmitting a measured voltage value provided at a receiving end of each consumer connected via a lead-in line from the low-voltage line;
Receiving a voltage value measured by the instrument and searching for a disconnection part of the high-voltage line based on the voltage value of the instrument;
A low voltage line break location search unit that receives a voltage value measured by the meter and searches for a break location of the low voltage line based on the voltage value of the meter;
The high-voltage wire break location searching unit is activated when a disconnection request for the distribution line is requested, and determines the voltage value of the terminal instrument of the low-voltage line, and the voltage value of the terminal instrument of the low-voltage line is abnormal. In some cases, the pole transformer of the low voltage line is a voltage abnormal transformer, and when the voltage value of the terminal gauge of the low voltage line is normal, the pole transformer of the low voltage line is a voltage normal transformer. It is determined that there is a possibility of disconnection in the high voltage line between the voltage normal transformer on the most load side and the voltage abnormal transformer on the most power source side,
The low-voltage wire break location search unit is activated when the voltage abnormal transformer is 1 or less in the high voltage line break location search unit, determines a voltage value of a meter connected to the low voltage line, and the voltage value is A voltage abnormality meter is an abnormal meter, a voltage normal meter is a voltage normal meter, and a low voltage line between the voltage normal meter closest to the load side and the voltage abnormal meter closest to the power supply side It is determined that there is a possibility of disconnection in the distribution system disconnection detection system. The low-voltage wire disconnection location search unit is
2. When all the meters on the low voltage line are voltage abnormality meters, it is determined that the voltage abnormality meter on the power source side is the low voltage line on the power source side, or that the pole transformer and the high voltage line are disconnected. Distribution system disconnection detection system described in 1.   When there is only one voltage abnormality meter, the low-voltage wire breakage location search unit is either a low-voltage line between the most abnormal voltage meter on the power supply side and the most normal voltage meter on the load side, or the disconnection of the lead-in wire or on the column The distribution system disconnection detection system according to claim 1, wherein it is determined that the fuse is blown. When the distribution system is an electric power distribution system in which only the electric light transformer is connected as the pole transformer, the end of the low voltage line is connected from the load side to the power source side. After determining the voltage value of the meter in order, it is determined that there is a possibility of disconnection in the high voltage line between the adjacent voltage normal transformer on the most load side and the voltage abnormal transformer on the most power supply side. , Confirm the voltage value of the terminal gauge of the low-voltage line on the power supply side from the voltage normal transformer to check whether there is a new voltage abnormal transformer on the power supply side, If not, it is determined that there is a disconnection in the high-voltage line between the adjacent voltage normal transformer on the most load side and the voltage abnormal transformer on the most power source side that have been determined earlier, and a new voltage abnormal transformer If there is a container, again the most adjacent load side Distribution system disconnection detection system according to any one of claims 1 to 3, characterized in that searching and said voltage abnormality transformer of the voltage normal transformer most the power supply side.   5. The high voltage line break location search unit and the low voltage line break location search unit determine that the voltage of the meter is abnormal when the voltage of the meter cannot be received. The distribution system disconnection detection system according to any one of the above.

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