JP5822742B2 - Distribution line monitoring control system and distribution line monitoring control method - Google Patents

Description

  The present invention relates to a distribution line monitoring control system suitable for detecting that an abnormality has occurred in a distribution line constituting a distribution system and determining an abnormality occurrence section.

  The distribution system is provided by connecting a plurality of distribution lines for supplying power from a high-voltage distribution bus to general consumers in a resinous manner. A protection relay is provided at the outlet of each distribution line to detect distribution line accidents by taking in various amounts of electricity from the distribution lines. When these protection relays detect distribution line accidents, the distribution line feeder is shut off. The device is shut off. Each distribution line is connected to be disconnected by a section switch, and the distribution lines are connected to each other by a connection switch that is normally open.

  Here, when a disconnection occurs in the distribution system in the distribution system, the decrease in load current generated by the disconnection, the change in ground capacitance, etc. are very small. It becomes difficult, and it becomes difficult to detect the disconnection phenomenon only by monitoring the amount of electricity by the protective relay on the power supply side. Therefore, the actual situation is that electric power companies grasp disconnection accidents by reporting complaints from general customers.

  In the event of a disconnection accident in the power distribution system as described above, a power distribution automation system based on remote operation of the switch of the power distribution system and system status monitoring is known as a system that quickly detects the location of the accident. . The distribution automation system has a configuration in which a master station installed in a control center and a slave station attached to each switch of distribution lines are connected by transmission means, and the transmission means transmits high-voltage distribution lines. There are a power line carrier system used as a path, a wired system provided with a dedicated transmission line such as a metal line and an optical fiber, and a wireless system, but most of them are distribution automation systems to which the power line carrier system is applied at present.

  As such a distribution automation system, for example, in Japanese Patent Application Laid-Open No. 2004-53554 (Patent Document 1), by first performing a polling monitoring on a disconnection detection device provided in an interconnection switch located at the end of a distribution line. A method is described in which a disconnection occurrence distribution line is specified, and then a disconnection section is determined in a short time by performing polling monitoring of a disconnection detection device installed in the distribution line.

JP 2004-53554 A

  The distribution automation system mainly for remote operation of the distribution system and monitoring the system status as described above is a means to transmit the master station installed in the control station and the slave stations attached to each distribution switch of the distribution line. It is the structure connected by. As this transmission means, a power line carrier system using a high-voltage distribution line as a transmission line, a wired system provided with a dedicated transmission line such as a metal line or an optical fiber, and a wireless system are used. Many have been applied.

  However, in the distribution automation system using the power line conveyance system that uses the high-voltage distribution line as the transmission line, a failure also occurs as the transmission line after the disconnection point. Therefore, in the technique described in Patent Document 1, after the disconnection point However, there is a problem that it is difficult to minimize the disconnection section.

  In addition, most of the disconnection detection devices provided in the section switch are configured such that the control power is supplied from the representative phase of the high-voltage distribution line. Therefore, when the power supply phase is disconnected, the control power supply of the disconnection detector is lost, and the information on the disconnection detector is collected in the same way as when the phase of the high-voltage distribution line used as the transmission line is disconnected. There is a problem that it is difficult to minimize the disconnection section.

  On the other hand, in response to the above-mentioned transmission line disconnection or loss of control power, a method of transmitting information by selecting the remaining healthy phase as a transmission line at the same time as detecting a disconnection phase, and a control power source of the disconnection detection device as a three-phase power supply A system configuration can be considered in which the control power supply is not lost when the one or two wires are disconnected. However, in this case, it becomes necessary to add a healthy phase selection circuit and a power transformer to each disconnection detector, and the configuration becomes complicated. In addition, such a system can handle 3-wire disconnection. There is a problem that it is not possible.

  The purpose of the present invention is to quickly detect the location of an accident with a simple configuration when an accident such as a disconnection in the power distribution system occurs, and to disconnect the accident occurrence section from a healthy power distribution system. Is to provide a distribution line monitoring and control system and a distribution line monitoring and control method that can be separated from an accident section.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-described problems. To give an example, a first disconnection detecting device that connects a plurality of distribution lines to a distribution bus and is provided at a plurality of locations of each distribution line, The second disconnection detection device provided on the distribution distribution line interconnecting each distribution line, the first disconnection detection device and the second disconnection detection device are polled to monitor the presence or absence of the disconnection, A supervisory control device for outputting a control command to the divisional switch installed in the first disconnection detection device or the interconnection switch installed in the second disconnection detection device to disconnect the disconnection portion from a healthy distribution system; In the distribution line disconnection detection system, the monitoring control device polls the second disconnection detection device to detect a disconnection of the distribution line, and at least one of the first disconnection detection devices provided in the distribution line. Distribution line for interconnection Outputs a control command to the communication system switching device so that power is supplied, characterized in that in order to determine the polling to broken portion a plurality providing said first disconnection detecting device to the distribution line.

  According to the present invention, when an accident such as a disconnection in a distribution system occurs, a distribution line monitoring and control system and a distribution system that can quickly detect the location of the accident with a simple configuration and further reduce the impact of the accident on consumers. An electric wire monitoring and control method can be provided.

It is a block diagram of the disconnection detection system using a power line conveyance system. It is a block diagram of a typical slave station of a power line carrier system. It is a figure which shows a disconnection area determination and a disconnection area isolation | separation main flow.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a disconnection detection system according to an embodiment of the present invention. The high-voltage distribution bus 5 located on the secondary side of the distribution transformer 4 is normally connected with the distribution lines 1 to n of 3 to 7 feeders via feeder circuit breakers FCB1 to FCBn at the distribution line outlets. Section switches DM11 to DMn3 that can be disconnected in the middle of the wires 1 to n, and the distribution switches that are connected to the distribution lines 1 to n and that are normally open, respectively, and that are not shown in the drawing. Are provided in the distribution line for interconnection, and are provided with normally-connected interconnection switches DM100 to DM (n-1) 00, and a dendritic distribution network is formed as a whole. Power is being supplied.

  Each of the division switches DM11 to DMn3 and the connection division switches DM100 to DM (n-1) 00 are provided with a disconnection detection device that also serves as a slave station of the distribution automation system. The disconnection detectors FD11 to FDn3 and FD100 to FD (n-1) 00, which are also used as slave stations, have an information transmission function based on a power line conveyance method using a distribution line as a transmission line. From the coupler 8 connected to the distribution bus 5 via the relay station 7 installed in the distribution substation, it is connected to the control station connected to the communication path 9 or the master station 6 that performs remote monitoring control installed in the sales office. ing.

  Normally, when a short circuit of the substation distribution lines 1 to n or a ground fault is detected by a protective relay device (not shown) provided in the substation, the feeder circuit breakers FCB1 to FCBn are operated to disconnect the distribution line where the accident is detected. Prevents the spread of accidents. However, if there is a break in the middle of the distribution line that does not cause a ground fault or the like, the load current generated by the break may decrease, the change in ground capacitance, etc. may be very small. It may be difficult to detect the disconnection phenomenon only by monitoring the amount. Therefore, in this embodiment, the disconnection detecting device provided in each of the division switches DM11 to DMn3 and the connection division switches DM100 to DM (n-1) 00 is polled to identify the disconnection location.

  FIG. 2 is a circuit diagram showing an example of a disconnection detecting device also used as a slave station of the above-described distribution automation system. This disconnection detection apparatus 10 includes a disconnection detection process 101 that takes in an electric quantity from the R phase, S phase, and T phase to detect the presence / absence of a disconnection, a transmission process 102 that transmits / receives information to / from the master station 6, and a transmission / reception by a power line carrier system The circuits 103 and 104, a distribution automation system slave station (not shown), a segment switch control circuit that issues a switch command to the segment switch, various electric quantity measurement circuits, and the like.

  At the installation location of the section switch 11, power supplies TR 111 and 112 that supply power to the disconnection detector (slave station), couplers 113 and 114 that are necessary for the power line carrier system, and PD 115 for detecting each phase voltage of the distribution line. , 116 are arranged as existing components. These power supplies TR, couplers, and PDs are usually arranged on both sides of the section switch 11 as shown.

  In the example of FIG. 2, the control power source of the disconnection detection device is supplied from the power sources TR 111 and 112 connected between the distribution lines R and T, and usually one of the preset power sources is selectively used. Has a circuit that automatically switches to the other when the power source is lost. Transmission / reception by the power line carrier system is performed through the couplers 113 and 114 connected to the S phase of the distribution line, and usually a circuit on the power source side is selectively used.

  In the disconnection detection processing 101, the phase voltages of the phase voltage detectors PD115 and 116 of the impedance voltage dividing system arranged at both ends of the section switch 11 are input, and the zero phase voltage or the reverse phase obtained by vector synthesis of the phase voltages. The voltage is calculated, an overvoltage at the time of disconnection of one or two wires is detected, and a no-voltage at each phase at the time of disconnection of the three wires is detected.

  Such disconnection detection processing can be used without adding a new disconnection detection device if only detection processing is added based on the amount of electricity in each phase that has already been taken into the distribution automation slave station as in this example. Is possible. Electrical quantity for disconnection detection section switches is possible disconnection detected only in one of the electric quantity detecting the electric quantity at both ends is the same in the closed state. When the section switch is in the open state, the disconnection detection information can be handled as information on the differently distributed wires from the amount of electricity at each end. In addition to the method that uses each phase voltage as an input in this example, the detection method that uses each phase current as an input, and even if each phase voltage input uses a detection method other than zero-phase voltage and reverse-phase voltage, disconnection detection processing is realized. However, since the detection method with high accuracy in the disconnection detection method is a detection method using the amount of electricity measured on the load side from the disconnection location, it is assumed here that disconnection detection is performed on the load side of the disconnection location. The following explanation will be given. In addition, the transmission process 102 performs a process of transmitting by adding disconnection detection information to transmission / reception information implemented in a normal power distribution automation system.

  Next, disconnection detection by the above-described disconnection detection system will be described with reference to FIG. As mentioned above, the current distribution system operation employs a distribution automation system mainly for the status monitoring and switching control of the division switch, and many of them are systems using transmission means by the power line carrier system. However, although it will be described by incorporating disconnection detection information into the information transmission of this distribution automation system, the configuration of the distribution automation system is generally widely known, so a detailed description thereof is omitted here, and a part of the configuration is illustrated. This will be described with reference to the flowchart shown in FIG. In addition, the state monitoring by the power line carrier distribution automation system uses a method called a polling method in which the monitoring target devices are called and communicated one by one.

  Now, assuming that a disconnection accident occurs at the disconnection point 13 shown in FIG. 1, a power distribution failure occurs after the disconnection point 13, and depending on the disconnection phase, a failure may occur as a transmission line. Power loss may occur.

  For example, in the connection configuration of FIG. 2, if the disconnection accident at the disconnection point 13 is, for example, the S-phase disconnection, the control power supply is present but the transmission path is disconnected, and if the R-phase disconnection, the transmission path is normal but the control power supply is lost. As a result, when a disconnection occurs, the disconnection detection device after the disconnection point 13 cannot transmit the disconnection information to the upper master station 6 and becomes a no-response state. However, the disconnection detection device attached to the connection division switch is Since the transmission path and the control power source on the side opposite to the distribution line 2 with the disconnection point 13 in the open state are always secured, the disconnection detection information can be transmitted to the master station 6.

  The description of the flowchart of FIG. First, when the disconnection detection processing start timing is reached in step S1 shown in FIG. 3, the disconnection detectors FD100 to FD (n (n) attached to the connection division switches DM100 to DM (n-1) 00 located at the ends of the distribution lines. -1) 00 polling is started. In this embodiment, it is assumed that polling of the disconnection detection devices FD100 to FD (n-1) 00 is performed in one cycle in several seconds to several tens of seconds. Next, in step S2, disconnection detection information is collected by individually monitoring each target disconnection detection device. In step S3, the presence or absence of disconnection detection information is checked. Conduct wire specific processing.

  In the case of the present embodiment, disconnection detection is enabled on the distribution line 2 side of the disconnection detection device FD100 and on the distribution line 2 side of the disconnection detection device FD200, and the disconnection detection device provided along with the other segmentation switch is not detected. Therefore, it is possible to specify that the disconnection point is in the distribution line 2, and in step S5, an alarm output for disconnection is issued.

  Next, the disconnection detecting device installed in the specified distribution line 2 is monitored in step S6. In the present embodiment, state monitoring is performed in order from the disconnection detecting device on the distribution bus 5 side, and the disconnection detecting device DM21 can acquire information that no disconnection is detected. And when the phase used for power line conveyance and the phase that is not the phase used for the power source of the disconnection detection device are disconnected, the disconnection detection device DM22 can acquire information that the disconnection is detected, The disconnection location 13 can be specified. In this case, the section switches DM21 and DM22 are opened so that the disconnection point 13 is disconnected from the healthy distribution line, and power is supplied from the other distribution lines 1 or 3 after the section switch DM22. The accident section can be minimized by closing the connection division switch DM100 or DM200.

  On the other hand, if the phase used for power line conveyance or the phase used for the power source of the disconnection detection device is disconnected, the disconnection detection devices DM22 and DM23 can acquire no-response information, so that the disconnection occurs in step S7. The section can be provisionally determined to be a section on the load side from the section switch 21 and the power supply side from the section switch DM23, and the disconnection section provisionally determined in step S8 is displayed.

  The section determination in step S7 is tentatively determined. The section with the original disconnection point 13 is a section sandwiched between the division switches DM21 and DM22 as shown in FIG. 1, but the disconnection detection devices FD22 and FD23 are This is because it is necessary to consider that no disconnection is detected and disconnection detection information cannot be acquired. Since it is certain that the disconnection provisional judgment section has at least a disconnection portion in the section, the disconnection section minimization is performed while disconnecting the disconnection section from the power distribution system in the next step S9 and subsequent steps.

  First, in step S9, in order to secure the transmission path and eliminate the supply failure after the disconnection point, the connection section switch DM200 is controlled to enter from far away to close the DM200 from open to close. The section switch DM21 is controlled to be turned off from a distance so that the DM21 is closed to an open state, and the end of the disconnection portion is set to a non-voltage state.

  Next, in step 11, the disconnection detection device is sequentially polled from the load side of the distribution line 2, and when the disconnection detection information of the disconnection detection devices FD23 and FD22 is acquired, the power source side / load side of the FD23 and FD22 are reversed. In step S12, both of them move from the information of no disconnection detection to the processing of step S13, and it can be determined that there is no disconnection point in the direction from the section switch DM22 to the connection section switch DM200, and the disconnection section is separated from the section switch DM21. It can be specified that the section is sandwiched between DMs 22.

  In step S14, the confirmed disconnection section is displayed, and in step S16, the section switch DM22 is controlled to be turned off from a distance to open the DM22, and the remaining end of the disconnection point 13 is set to no voltage to minimize the accident section. it can. Thereby, for example, power can be supplied to the consumer connected between the section switch DM22 and the section switch DM23 through the distribution distribution line.

  As described above, according to the present invention, when an accident such as a disconnection in a power distribution system occurs, the location where the accident occurred can be detected quickly with a simple configuration, and the impact on the consumer due to the accident can be further reduced. can do.

  Further, in this embodiment, existing components can be used together and new equipment investment can be made, and the disconnection section can be minimized in a short time and separated from the power distribution system to ensure public safety.

  Further, in this embodiment, when polling is performed from the connection section switch side, the section switch DM22 is opened from the closed state after the disconnection point 13 is specified, but the connection section switch DM200 is controlled to be turned on. Immediately after this, the section switches DM22 and DM23 are disconnected, and when performing polling monitoring, the DM23 and DM22 are sequentially closed from the open to the closed, and the disconnection location can be determined. Thereby, since the time which a power supply is connected to the disconnection location 13 can be shortened, public safety can be ensured more.

1 to 3 Distribution lines 4 Distribution transformer 5 High voltage distribution bus 6 Master station 7 Relay device 8 Coupler 9 Communication path 10, FD11 to FDn3 Disconnection detection device (slave station)
11, DM11 to DMn3 Sectional switch 101 Disconnection detection processing 102 Transmission processing 103, 104 Transmission / reception circuits 111, 112 Power supply TR
113, 114 Coupler 115, 116 PD
FCB1 to FCBn Feeder circuit breaker DM100 to DM (n-1) 00 Interconnection switch

Claims (5)

A plurality of distribution lines connected to the distribution bus, and a first disconnection detector provided at a plurality of locations of each distribution line;
A second disconnection detection device provided on the distribution distribution line connecting the distribution lines;
The first disconnection detection device and the second disconnection detection device are polled to monitor the presence or absence of disconnection, and are attached to the section switch provided in the first disconnection detection device or the second disconnection detection device. In a distribution line disconnection detection system having a monitoring control device that outputs a control command to the interconnection switch to be disconnected from a healthy distribution system,
When the monitoring control device detects disconnection of the distribution line by polling of the second disconnection detection device, the monitoring control device sequentially monitors the state of the first disconnection detection devices provided on the distribution line where the disconnection is detected, and monitors the state. When there is no response from any of the first disconnection detection devices, the interconnection is configured such that power is supplied from the interconnection distribution line to at least one first disconnection detection device provided in the distribution line. Distribution line disconnection detection system, characterized in that a control command is output to a switch for a power supply . In claim 1 ,
The monitoring control device outputs a control command to any one of the division switches provided in the distribution line so as to cut off the distribution line after the disconnection detection device that does not respond to state monitoring. Disconnection detection system. In claim 1,
The distribution control system according to claim 1, wherein the monitoring control device communicates with the first disconnection detection device and the second disconnection detection device using power line carrier communication. In claim 1,
When the monitoring and control device detects disconnection of the distribution line by polling of the second disconnection detection device, the monitoring control device is provided on the distribution bus side among the first disconnection detection devices provided on the distribution line in which disconnection is detected. The state of the distribution line where the first disconnection detection device without the response is installed when the state is monitored in order from the first disconnection detection device and there is no response from any of the first disconnection detection devices Output the control command to the section switch on the distribution bus side from the first disconnection detection device so as to be disconnected from the distribution bus,
Outputting a control command to the interconnection switch so that power is supplied from the interconnection distribution line to at least one first disconnection detection device provided in the distribution line in which the disconnection is detected;
Among the first disconnection detection devices provided on the distribution line in which disconnection is detected, the state is monitored in order from the first disconnection detection device provided on the connection switch side to determine the disconnection location,
A distribution line disconnection detection system that outputs a control command from the disconnection point to the section switch on the connection distribution line side so as to disconnect the disconnection point from the distribution line. Connect a plurality of distribution lines to the distribution bus, and poll the disconnection detection device provided in the distribution distribution line that connects the distribution lines.
When disconnection of any of the distribution lines is detected, the disconnection detection devices provided at a plurality of locations of the distribution line are sequentially monitored, and if there is no response from any of the disconnection detection devices that have been monitored, the distribution line at least one distribution line break detection method and outputs a control command to the tie-switching device provided in the communication system for distribution lines as power to breakage detecting device is supplied to provide the.