JP2012065389A - Accident time waveform data collection method of power distribution system and switch sub-station used for implementation thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to perform collection of waveform data of voltage and current at the time of an accident without trouble even in a distribution system without a communication infrastructure capable of high-speed and large-capacity communication.SOLUTION: Each switch sub-station 6 comprises an accident time waveform data storage part 605 which stores and retains waveform data of zero-phase voltage and zero-phase current measured from the fixed time before the time of detecting an accident to the time of detecting the accident with time information for specifying the time of detecting the waveform data. Depending on a request from a master station 9, the waveform data stored in the accident time waveform data storage part 605 in each of the switch sub-station 6 is transmitted to the master station 9. When data amount stored in the accident time waveform data storage part 605 in each of the switch sub-station 6 reaches determined reference data amount, the waveform data stored in the accident time waveform data storage part 605 is transmitted to the master station 9 and cleared after that.

Description

  The present invention relates to a method of collecting data of voltage and current waveforms measured when an accident occurs in a power distribution system, and a switch slave station used to implement this method.

  In the distribution system, multiple slave stations are installed on the distribution line, and each slave station detects system voltage and load current, and records accident information such as the presence of an accident, the type of accident, and the direction in which the accident occurred. Detection is performed. Usually, the slave station is provided in a form attached to a section switch inserted in the middle of the distribution line. A slave station provided for each section switch is called a switch slave station. Each switch slave station has a function to control the turning on and off of the division switch, and also detects accident information based on voltage and current information detected by sensors provided in the division switch. It has a function and a communication function, and in response to a request from a master station installed at a power company sales office, various detected information is transmitted to the master station. Or relay signals to be sent to Based on the information collected from each slave station, the master station grasps the load situation and locates the accident point, performs remote system switching in response to changes in the load situation, and restores the accident based on the orientation result. For example, the remote control of the section switch necessary for this is performed.

  In order to accurately operate the distribution system and improve the quality of electric power, it is necessary to analyze accidents that occur in the distribution system and eliminate the causes of accidents as much as possible. For example, when a micro ground fault occurs frequently due to the trees coming into contact with the distribution line during a strong wind, it is necessary to identify the section where the accident occurs and take measures such as cutting the trees. In order for the master station to accurately analyze the accident, it is desirable to be able to analyze the waveform data of the zero-phase voltage and zero-phase current at the time of the accident.

  As a method of collecting various waveform data acquired in each slave station in the master station, a data collection method disclosed in Patent Document 1 is known. In the data collection method disclosed in Patent Document 1, each slave station includes a waveform storage unit that sequentially stores waveform data such as system voltage, phase current, zero phase current, and zero phase voltage together with time information. Every time the data stored in the storage unit exceeds the storage capacity, the old data is erased and the new data is stored, so that the voltage and current waveforms measured during a certain time are always waveformd together with the time information. It is stored in the storage unit. Each slave station also constantly monitors the presence or absence of an accident and transmits the occurrence of the accident to the parent station when an accident is detected. When the master station receives information on the occurrence of an accident from any slave station, the master station instructs each slave station to stop data collection. After confirming that each slave station has stopped collecting data, the master station gives an instruction to each slave station, and records the waveform data at the time of the accident stored in the waveform data storage section of each slave station along with time information. Instructs to transmit, receives the waveform data and time information transmitted from each slave station in response to the command, and stores the received waveform data and time information in the storage unit.

  As described above, if the master station collects the waveform data immediately before the accident acquired by each slave station, it is possible to accurately identify the type of accident such as ground fault, short circuit, disconnection, etc. Of course, the cause of the accident can be identified accurately.

JP 2008-8669 A

  When the waveform data stored in the waveform storage unit by each slave station is transmitted to the master station when an accident occurs as in the method disclosed in Patent Document 1, each slave station transmits to the master station when an accident occurs. Since the amount of data to be transmitted is very large, if the communication speed of the communication line connecting the slave station and the master station is slow, it takes a long time to communicate from each slave station to the master station, which hinders recovery from accidents. Will come. The method disclosed in Patent Document 1 is based on the premise that the master station and each slave station are connected by a communication line that can transmit a large amount of data at high speed, such as an optical cable. In an area where a communication infrastructure capable of high-speed and large-capacity communication such as an optical cable is not established in the distribution system, waveform data at the time of an accident cannot be collected by the method disclosed in Patent Document 1.

  An object of the present invention is to collect waveform data at the time of an accident without affecting the recovery process of the accident even in an area where a communication infrastructure capable of high-speed and large-capacity communication such as an optical cable is not established in the distribution system. An object of the present invention is to provide a method for collecting waveform data at the time of an accident in a distribution system and a switch slave station used for carrying out this method.

In the present specification, at least the following first to eighth inventions are disclosed.
1st invention 1st invention is provided with the switch substation with respect to each division switch inserted in the distribution line, and the switch substation and the master station are connected through the communication means. The present invention relates to an accident waveform data collection method for collecting the waveform data of load current, zero phase voltage and zero phase current measured at the time of an accident as distribution waveform data.

  In the present invention, a sampling unit for sampling the instantaneous value of each output of the load current detector, the zero-phase voltage detector and the zero-phase current detector provided in the section switch corresponding to each switch slave station, The load current, zero-phase voltage and zero-phase current detection signal data sampled by the sampling unit during a predetermined time is used as the load current, zero-phase voltage and zero-phase current waveform data, and the waveform data is Each switch slave station is provided with a sampling data storage unit that stores time information indicating the time at which the instantaneous value was sampled, and an accident waveform data storage unit that stores waveform data at the time of the accident. And when an accident in the distribution system is detected in each switch slave station, the waveform data stored in the sampling data storage section in each switch slave station is used as the waveform data at the time of the accident together with the time information and the waveform data storage section at the time of the accident And store the waveform data at the time of the accident and the time information stored in the waveform data storage unit at the time of the accident at each switch slave station when a request is received from the master station. .

  As described above, the waveform data storage part at the time of accident is stored in each switch slave station to store and hold the waveform data at the time of accident, and when there is a request from the master station, the accident of each switch slave station If the accident waveform data stored in the hourly waveform data storage unit is transmitted to the master station, the accident waveform data is sent to the parent station over a sufficient period of time after the accident recovery process is completed. Even in a power distribution system that does not have a communication infrastructure that can perform high-speed and large-capacity communication, such as optical fiber, it can be transmitted to a station without any trouble in the recovery process of the accident. Waveform data can be collected.

2nd invention 2nd invention is applied to 1st invention, and in this invention, the data amount memorize | stored in the waveform data storage part at the time of an accident provided in each switch slave station is set. When the specified reference data amount is reached, the accident waveform data and time information stored in the accident waveform data storage unit are transmitted to the master station, and then stored in the accident waveform data storage unit. Clear the contents.

  If comprised in this way, the amount of data memorize | stored in the waveform data storage part at the time of an accident provided in each switch slave station will exceed the storage capacity, and the situation where it becomes impossible to memorize | store new waveform data at the time of an accident will arise Can be prevented.

Third Invention The third invention is applied to the first invention or the second invention. In the present invention, each switch slave station uses the waveform data stored in the waveform data storage unit at the time of accident as a parent. When it is detected that an accident has occurred in the power distribution system during transmission to the station, the transmission of the accident waveform data stored in the accident waveform data storage means to the master station is interrupted.

  With this configuration, it is possible to prevent the transmission of the waveform data at the time of the accident from affecting the accident recovery processing by the master station, and thus it is possible to prevent the accident recovery from being delayed.

4th invention 4th invention is applied to either 1st invention thru | or 3rd invention, In this invention, the said sampling part is a division switch corresponding to each switch substation. The instantaneous value of the detection signal of the system voltage detected at the installation location is also sampled. In this case, the sampling data storage unit is configured to store the waveform data of the system voltage including the instantaneous value of the detection signal of the system voltage sampled by the sampling unit for a certain time as the waveform data at the time of the accident. When an accident in the distribution system is detected at the slave station, the waveform data of the system voltage is also stored in the accident waveform data storage unit as the waveform data at the time of the accident.

  If comprised in this way, not only the zero phase voltage and zero phase current waveform at the time of an accident but the waveform data of system voltage and load current can be collected. Therefore, the situation of the system at the time of the accident can be grasped in more detail, and the accident can be analyzed more accurately.

Fifth Invention The fifth invention relates to a switch slave station provided for each section switch inserted in a distribution line in order to implement the above waveform data collection method.

  The switch slave station according to the present invention includes a sampling unit that samples an instantaneous value of each output of a load current detector, a zero-phase voltage detector, and a zero-phase current detector provided in a corresponding section switch, and a constant The data of the instantaneous values of the detection signals of the load current, zero phase voltage and zero phase current sampled by the sampling unit during the time are used as the waveform data of the load current, zero phase voltage and zero phase current, and the waveform data is A sampling data storage unit that stores time information indicating the time of instant sampling, and an accident detection unit that detects the occurrence of an accident from load current, zero phase voltage, and zero phase current detection signals; An accident waveform data storage unit that stores and saves waveform data at the time of an accident, and a sampling data storage unit when the accident detection unit detects the occurrence of an accident. There is a request from the master station and a waveform data storage control unit that transfers the stored load current, zero-phase voltage, and zero-phase current waveform data to the accident waveform data storage unit together with time information as accident waveform data. A communication control unit that reads out the waveform data at the time of the accident and the time information stored in the waveform data storage unit at the time of the accident and transmits them to the master station.

6th invention 6th invention is applied to 5th invention. In this invention, a communication control part transmits the data memorize | stored in the waveform data storage part at the time of an accident to a master station. During this time, when the accident detection unit detects the occurrence of the accident, transmission of the waveform data at the time of the accident to the master station is interrupted.

7th invention 7th invention is applied to 5th or 6th invention, and in this invention, the waveform data storage control part is the amount of data memorize | stored in the waveform data storage part at the time of an accident. After requesting the communication control unit to transmit the waveform data at the time of accident and the time information stored in the waveform data storage unit at the time of accident when the set reference data amount is reached, a reset command is given. It is configured to clear the stored contents of the waveform data storage unit at the time of accident. In this case, the communication control unit performs the process of transmitting the waveform data at the time of the accident and the time information stored in the waveform data storage unit at the time of the accident to the master station in response to a request from the waveform data storage control unit. The data storage control unit is configured to give the reset command.

Eighth Invention The eighth invention is applied to any of the fifth to seventh inventions. In the present invention, the system detected by the sampling unit at the location of the corresponding section switch. An instantaneous value of the voltage detection signal is also sampled. The sampling data storage unit is configured to store the instantaneous sampling value of the system voltage detection signal as the system voltage and load current waveform data, and also to store the system voltage and load current waveform data. The control unit transfers the waveform data of the system voltage and load current stored in the sampling data storage unit when the accident detection unit detects the occurrence of the accident to the waveform data storage unit at the time of accident and stores them as waveform data at the time of the accident. Configured to let

  In the present invention, an accident waveform data storage unit for storing and storing waveform data at the time of an accident is provided in each switch slave station, and waveform data at the time of the accident is transmitted to the master station immediately when an accident occurs. Instead, when there was a request from the master station, the accident waveform data stored in the waveform data storage section of each switch slave station was sent to the master station, so the accident recovery process was completed. It is possible to send a transmission request from the master station to each switch slave station in a time zone when there is a margin, and to send the waveform data at the time of the accident to the master station over a sufficient time. Therefore, according to the present invention, even in a power distribution system that does not have a communication infrastructure capable of performing high-speed and large-capacity communication, such as an optical fiber, the waveform data at the time of the accident is obtained without causing any trouble in the recovery process of the accident. Can be collected.

  In the present invention, when the amount of data stored in the waveform data storage unit at the time of accident provided in each switch slave station reaches the set reference data amount, the data is stored in the waveform data storage unit at the time of accident. If the stored data in the accident waveform data storage section is cleared after the processing to transmit the waveform data and time information that has been performed to the master station, the accident waveform provided in each switch slave station It is possible to prevent a situation in which the amount of data stored in the data storage unit exceeds the storage capacity and new waveform data at the time of accident cannot be stored.

  Further, in the present invention, when each switch slave station transmits the waveform data stored in the accident waveform data storage unit to the master station, it is detected that an accident has occurred in the power distribution system. If the transmission of the waveform data at the time of accident stored in the storage means to the master station is interrupted, the transmission of the waveform data at the time of accident can be prevented from affecting the accident recovery processing by the master station. , It can prevent the recovery of accidents from being delayed.

It is the circuit diagram which showed an example of the structure of a power distribution system. It is the circuit diagram which showed an example of the structure of the division switch provided in a power distribution system. It is the block diagram which showed the structure of one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a configuration example of a power distribution system. In the figure, 1 is a substation comprising a transformer 2 and a circuit breaker 3 connected to the secondary side of the transformer 2. Electric power is supplied to the primary side of the transformer 2 from a power plant or an upper substation, and a distribution line 4 is connected to the secondary side of the transformer 2 through a circuit breaker 3.

  In the middle of the distribution line 4, section switches 5, 5,... Are inserted at predetermined intervals, the distribution line 4 is divided into a plurality of sections, and power is supplied from the distribution lines in each section to the customer's load. Yes. As will be described later, the section switch 5 has a configuration in which a switch for turning on and off a load current and sensors such as a zero-phase current transformer and a zero-phase voltage transformer are accommodated in a case.

  Reference numeral 6 denotes a switch slave station provided for each section switch 5, and each switch slave station 6 is connected to the corresponding section switch 5 through the single-phase step-down transformers 7 and 8 from the distribution lines on both sides. A voltage between two of the phases is given as a power supply voltage. Each switch slave station 6 is connected through a communication line 10 to a master station 9 installed at a sales office of an electric power company. Although a distribution line or an optical cable is used as the communication line 10, in this embodiment, a distribution line is used as the communication line 10, and communication between each slave station and the master station is performed by the power line conveyance method. Shall.

  The division switch 5 is configured, for example, as shown in FIG. In the figure, 4a to 4c are inserted in series in a three-phase distribution line, and the three-phase main circuit conductors 5a to 5c forming a part of the distribution line are inserted in series in the middle of the main circuit conductors 4a to 4c. Switch. The switches 5a to 5c are, for example, a known electromagnetic switch having a making coil and a holding coil (both not shown) connected in series with each other, and are turned on when the making coil is energized. After that, the holding current limited through the series circuit of the closing coil and the holding coil is energized to be held in the on state, and the holding current is cut off to be in the off state.

  ZCT is a zero-phase current transformer that detects a zero-phase current flowing through the three-phase main circuit conductors 4a to 4c on the power source side of the switches 5a to 5b and outputs a zero-phase current detection signal Io, and ZPD is a switch 5a to 5b. It is a capacitor type zero phase voltage transformer that detects a zero phase voltage on the load side and outputs a zero phase voltage detection signal Vo. The zero-phase voltage transformer ZPD includes capacitors C1a to C1c having one end connected in common and the other end connected to the main circuit conductors 4a to 4c, and a capacitor C2 having one end connected to a common connection point of these capacitors. And an instrument transformer PT in which the output voltage of the capacitor divider circuit obtained at both ends of the capacitor C2 is applied to the primary winding.

  In this example, in order to detect the load current, current transformers CTa and CTc for detecting the A-phase current and the C-phase current on the load side of the switches 5a to 5c are provided in the section switch 5. Yes. The zero-phase current detection signal Io output from the zero-phase current transformer ZCT, the zero-phase voltage detection signal Vo output from the zero-phase voltage transformer ZPD, and the load current detection signals Ia and Ic output from the current transformers CTa and CTc are: It is given to the switch slave station 6 through a signal cable (not shown). The output voltages V1 and V2 of the transformers 7 and 8 are used as system voltage detection signals.

  The segment switch 5 shown in FIG. 2 is controlled by a switch slave station 6. The switch slave station 6 includes a power supply unit (not shown) that rectifies the output voltage of the transformer 7 or the output voltage of the transformer 8 and outputs a constant DC voltage. Depending on the presence / absence of distribution line voltage (voltage at the left end of the main circuit conductors 4a to 4c) and load side distribution line voltage (voltage at the right end of the main circuit conductors 4a to 4c), the power supply unit uses the output voltage V1 of the transformer 7 as the power supply voltage. And a state in which the output voltage V2 of the transformer 8 is received by the power supply unit as a power supply voltage, and whether there is a command given from the master station 9, the distribution line voltage on the power supply side, and the distribution line voltage on the load side. Accordingly, the switches 5a to 5c are controlled to be turned on or off.

  For example, when a voltage is applied to both the power supply distribution line and the load distribution line and both the output voltage V1 of the transformer 7 and the output voltage V2 of the transformer 8 exist, one of the voltages V1 and V2 is set. When the voltage of one of the power supply side distribution line and the load side distribution line is lost and one of the output voltages V1 and V2 of the transformers 7 and 8 is lost, The transformers 7 and 8 and the input terminal of the power supply unit in the slave station 6 are switched and connected so that the existing one of the output voltages V1 and V2 is input to the power supply unit.

  In the steady state, a drive current is supplied from the power supply unit (not shown) in the slave station 6 to the input coil and the holding coil of the switches 5a to 5c to keep these switches in an on state, and an accident occurs in the distribution system. When it is necessary to open the section switch, the supply coil of the switches 5a to 5c is turned off from the power supply unit so that the supply of drive current to the input coil and the holding coil is stopped and the switches 5a to 5c are turned off. And the supply of drive current to the holding coil.

  FIG. 3 shows a configuration of a part related to the main part of the present invention in the configuration of the switch slave station 6. The switch slave station 6 according to the present embodiment includes an A / D conversion unit 601, a voltage / current sampling unit 602, a sampling data storage unit 603, an accident detection unit 604, an accident waveform data storage unit 605, A waveform data storage control unit 606, a communication control unit 607, and a switch control unit 608 are provided. In addition to these components, the switch slave station 6 includes a power supply unit provided with a rectifier for rectifying the output voltage of the transformer 7 or 8 shown in FIG. 1, power supply side distribution line voltage, and load side distribution line voltage. A switching circuit for switching and connecting the output terminal of the transformer 7 or 8 to the input terminal of the power supply unit depending on the presence or absence of the power supply and a backup power supply (battery) for operating the microprocessor in the slave station in the event of a power failure are provided. It is omitted.

  As the A / D conversion unit 601, one provided in the input interface unit of the microprocessor is used. The voltage / current sampling unit 602, the sampling data storage unit 603, the accident detection unit 604, the waveform data storage control unit 606, and the like. The communication control unit 607 is realized by causing a microprocessor to execute a predetermined program. The accident waveform data storage unit 605 includes a rewritable nonvolatile memory such as an EEPROM.

  The A / D converter 601 shown in FIG. 3 includes load current detection signals Ia, V2 obtained from the output voltages V1, V2 of the transformers 7, 8 and current transformers CTa, CTc, which are voltages proportional to the system voltage. This is a part that receives the instantaneous values of Ic, the detection signal Vo obtained from the zero-phase voltage transformer ZPD, and the detection signal Io obtained from the zero-phase current transformer ZCT, and converts these input signals into digital signals.

  The voltage / current sampling unit 602 includes output voltages V1 and V2 of the transformers 7 and 8 converted into digital signals by the A / D conversion unit 601, detection signals Ia and Ic obtained from the current transformers CTa and CTc, and a zero-phase voltage. The instantaneous values of the detection signal Vo obtained from the transformer ZPD and the detection signal Io obtained from the zero-phase current transformer ZCT are sampled at a constant sampling interval. The timing for sampling each signal is determined by clock pulses generated by an oscillator provided in the microprocessor.

  The sampling data storage unit 603 stores the system voltage detection signals V1, V2, the load current detection signals Ia, Ic, the zero phase voltage detection signal Vo, and the zero phase current detection signal Io sampled by the voltage / current sampling unit 602 at regular time intervals. A series of sampling values (instantaneous values) as system voltage, load current, zero-phase voltage, and zero-phase current waveform data, and these waveform data are used as sampling times for the sampling values constituting each waveform data. Is stored together with time information (including date information).

  The accident detection unit 604 detects the occurrence of an accident by detecting the occurrence of a ground fault, a short circuit accident, and a disconnection accident from the zero phase voltage detection signal Vo, the zero phase current detection signal Io, and the load current detection signals Ia and Ic. Sometimes an accident detection signal is given to the waveform data storage control unit 606 and the communication control unit 607.

  The accident waveform data storage unit 605 is a part that stores and stores waveform data at the time of the accident. In the present embodiment, the waveform data storage unit 605 at the time of the accident has the waveform data of the zero-phase voltage detection signal Vo at the time of the accident and the waveform data of the system voltage detection signals V1, V2 at the time of the accident as the waveforms of the zero-phase voltage at the time of the accident. The voltage waveform data storage unit 605A at the time of accident stored as data and waveform data of system voltage, the waveform data of the zero phase current detection signal Io at the time of the accident, and the waveform data of the load current detection signals Ia and Ic at the time of the accident, respectively An accident current waveform data storage unit 605B that stores waveform data of zero phase current at the time of accident and waveform data of load current at the time of the accident.

  The waveform data storage control unit 606 controls the storage of data in the accident waveform data storage unit 605. When an accident detection signal is given from the accident detection unit 604 (the accident detection unit 604 detects the occurrence of an accident). The stored data in the sampling data storage unit 603 is transferred to the waveform data storage unit 605 at the time of the accident, and the waveform data of the zero-phase voltage detection signal Vo at the time of the accident and the waveform data of the system voltage detection signal at the time of the accident Are stored in the accident voltage waveform data storage unit 605A together with time information (including date and time information) indicating the time at which the sampling values constituting each waveform data were obtained, and a zero-phase current detection signal at the time of the accident Io waveform data and waveform data of load current detection signals Ia and Ic at the time of an accident are sampled for sampling values constituting each waveform data. Stored in the accident current waveform data storage unit 605B together with the time information indicating the time.

  The waveform data storage control unit 606 used in this embodiment also stores in the accident waveform data storage unit 605 when the data amount stored in the accident waveform data storage unit 605 reaches the set reference data amount. After requesting the communication control unit 607 to transmit the waveform data and time information that has been transmitted to the master station 9, the stored contents of the waveform data storage unit 605 at the time of the accident are stored when a reset command is given from the communication control unit 607. It is configured to perform a clearing process.

  The communication control unit 607 basically transmits a signal indicating accident information such as the type of accident and the direction in which the accident occurred to the master station 9 when an accident occurs and the substation breaker is opened. This is the part that performs the process and the process of reading out the waveform data and the time information at the time of the accident stored in the waveform data storage unit 605 at the time of the request from the master station 9 and transmitting them to the master station 9 .

  In addition to performing the above processing, the communication control unit 607 used in the present embodiment detects an accident from the accident detection unit 604 while transmitting the data stored in the waveform data storage unit 605 at the time of the accident to the master station. When a signal is given (when an accident occurs), the transmission of the waveform data at the time of the accident to the master station 9 is interrupted, and after the accident is recovered, the waveform data at the time of the accident is retransmitted to the master station, or It is also configured to perform processing for transmitting an untransmitted portion of the waveform data at the time of the accident to the master station. With this configuration, it is possible to prevent the transmission of the waveform data at the time of the accident from affecting the recovery process of the accident.

  The communication control unit 607 used in the present embodiment also stores the waveform data and time stored in the accident waveform data storage unit 605 when the master station 9 is requested to transmit the waveform data and time information at the time of the accident. It is configured to give a reset command to the waveform data storage control unit 606 after performing processing for transmitting information to the master station 9.

  The accident detection unit 604 detects that the zero-phase voltage detection signal Vo and the zero-phase current detection signal Io obtained from the zero-phase voltage transformer ZPT and the zero-phase current transformer ZCT in the corresponding section switch have exceeded the threshold values. Detect that a ground fault has occurred. The accident detection unit 604 also detects the ground fault direction from the phase relationship between the zero-phase voltage detection signal Vo and the zero-phase current detection signal Io. The accident detection unit 604 also detects a short-circuit accident because the load current detection signal Ia or Ic exceeds the judgment value, and causes a disconnection accident due to an increase in the zero-phase voltage on the load side of the segment switch or a decrease in the load current. Detect outbreaks.

  When the accident detection unit 604 detects an accident, the waveform data storage control unit 606 transfers the stored contents of the sampling data storage unit 603 to the accident waveform data storage unit 605, so that the waveform data stored in the sampling data storage unit 603 is stored. (Waveform data measured from a certain time before the time when the accident occurred until the time when the accident occurred) is stored in the accident waveform data storage unit 605 as the accident waveform data.

  When an accident occurs, the circuit breaker 3 at the substation opens, causing a power failure in the distribution system. At this time, the master station 9 instructs each slave station to transmit accident information. The communication control unit 607 of each switch slave station 6 transmits accident information such as the type of accident and the direction of the accident point to the master station in response to a command from the master station 9. The master station 9 turns on the circuit breaker 3 when a predetermined time elapses after the power distribution system fails. As a result, if no accident occurs, power supply to the distribution system is continued. If an accident occurs even after several reclosings, the power distribution system is cut off and the accident point is determined based on the accident information sent from each slave station. After that, the section switch 5 is manually opened at the site where the accident occurred to separate the accident section and perform the accident recovery work.

  In this embodiment, after the accident recovery process is completed, the master station 9 gives an accident waveform data transmission command to each switch slave station. When an accident waveform data transmission command is given to each switch slave station 6, the accident waveform data and time information stored in the accident waveform data storage unit 605 of each switch slave station are transmitted to the master station 9. Then, the waveform data and time information at the time of the accident are collected in the master station. Since the waveform data and time information at the time of the accident need only be transmitted slowly over time, even if the communication line connecting each switch slave station and the master station cannot perform high-speed and large-capacity communication, Time waveform data can be collected without any trouble. The waveform data at the time of the accident collected at the master station is used for analyzing the cause of the accident in preparation for system operation.

  If the accident detection unit 604 detects an accident while the communication control unit 607 is transmitting the accident waveform data, the communication control unit 607 interrupts the transmission of the accident waveform data to the master station. Therefore, even if transmission of the waveform data at the time of the accident is performed over time, the processing necessary for the accident recovery such as the location of the accident point is not affected.

  The waveform data storage control unit 606 constantly monitors the amount of waveform data stored in the accident waveform data storage unit 605, and the amount of data stored in the accident waveform data storage unit 605 is set. When the reference data amount is reached, the communication control unit 607 is requested to transmit the accident waveform data and time information stored in the accident waveform data storage unit 605 to the master station 9. At this time, the communication control unit 607 receives permission from the master station 9 and transmits the waveform data at the time of accident and the time information stored in the waveform data storage unit 605 at the time of the accident to the master station 9, and then the waveform data storage control unit 606. Is given a reset signal to cause the waveform data storage control unit 606 to perform a process of clearing the stored contents of the accident waveform data storage unit 605.

  Like the above embodiment, the waveform data storage unit 605 at the time of the accident stores the waveform data of the system voltage at the time of the accident together with the waveform data at the time of the accident of the load current, the zero phase voltage and the zero phase current. It is preferable because the amount of information used for accident analysis can be increased, but the system voltage waveform is not directly used for detection of ground faults and short-circuit accidents. The waveform data storage unit 605 may not be stored.

DESCRIPTION OF SYMBOLS 1 Substation 2 Transformer 3 Circuit breaker 4 Distribution line 5 Division switch 6 Switch slave station 7,8 Transformer 601 A / D conversion part 602 Voltage / current sampling part 603 Sampling data storage part 604 Accident detection part 605 Waveform at the time of an accident Data storage unit 606 Waveform data storage control unit 607 Communication control unit 608 Switch control unit

Claims (8)

A load measured at the time of an accident in a distribution system in which a switch slave station is provided for each section switch inserted in the distribution line, and the switch slave station and the master station are connected through communication means A waveform data collection method at the time of an accident that collects each waveform data of current, zero phase voltage and zero phase current,
A sampling unit that samples the instantaneous value of each output of the load current detector, the zero-phase voltage detector, and the zero-phase current detector provided in the section switch corresponding to each switch slave station, and a fixed time The load current, zero-phase voltage and zero-phase current detection signal data sampled by the sampling unit is used as load current, zero-phase voltage and zero-phase current waveform data, and the waveform data is sampled for each instantaneous value. A sampling data storage unit that stores time information indicating the time of the performed timing and an accident waveform data storage unit that stores waveform data at the time of an accident are provided in each switch slave station,
When an accident of the distribution system is detected in each switch slave station, the waveform data stored in the sampling data storage unit in each switch slave station is used as the waveform data at the time of accident together with the time information and the waveform data at the time of the accident Store it in the storage unit,
Transmitting the waveform data at the time of accident and time information stored in the waveform data storage unit at the time of accident of each switch slave station when requested from the master station to the master station;
A method for collecting waveform data at the time of an accident in a power distribution system. When the amount of data stored in the waveform data storage unit at the time of accident provided in each switch slave station reaches the set reference data amount, the waveform at the time of accident stored in the waveform data storage unit at the time of the accident Clearing the stored contents of the waveform data storage unit at the time of the accident after transmitting data and time information to the master station,
The method for collecting waveform data at the time of an accident of the distribution system according to claim 1. When it is detected that an accident has occurred in the power distribution system while each switch slave station transmits the waveform data stored in the waveform data storage unit at the time of the accident to the master station, the waveform data storage unit at the time of the accident The transmission of the waveform data at the time of accident stored in
The method for collecting waveform data at the time of an accident in the distribution system according to claim 1 or 2. The sampling unit is configured to sample the instantaneous value of the detection signal of the system voltage detected at the installation location of the section switch corresponding to each switch slave station,
The sampling data storage unit is configured to also store system voltage waveform data including instantaneous values of system voltage detection signals sampled by the sampling unit during the predetermined time period,
When an accident of the distribution system is detected in each switch slave station, the waveform data of the system voltage is also stored in the waveform data storage unit at the time of the accident as waveform data,
The method for collecting waveform data at the time of an accident in a power distribution system according to claim 1, 2, or 3. A switch slave station provided for each section switch inserted in the distribution line,
A sampling unit that samples the instantaneous value of each output of the load current detector, the zero-phase voltage detector, and the zero-phase current detector provided in the corresponding section switch;
The waveform data of load current, zero-phase voltage and zero-phase current as the waveform data of the load current, zero-phase voltage and zero-phase current is used as the load current, zero-phase voltage and zero-phase current detection signal data sampled by the sampling unit during a predetermined time. A sampling data storage unit that stores the time information indicating the time at which the sampling of each instantaneous value was performed,
An accident detection unit for detecting whether or not an accident has occurred from detection signals of the load current, zero phase voltage and zero phase current;
Accident waveform data storage unit that stores and stores waveform data at the time of the accident,
When the accident detection unit detects the occurrence of an accident, the waveform data of the load current, zero phase voltage, and zero phase current stored in the sampling data storage unit as the waveform data at the time of the accident together with the time information, the waveform at the time of the accident A waveform data storage control unit to be transferred and stored in the data storage unit;
A communication control unit that reads out the waveform data at the time of the accident stored in the waveform data storage unit at the time of the accident and the time information when there is a request from the master station, and transmits to the master station;
A switch slave station comprising:   The communication control unit is in the event of an accident to the parent station when the accident detection unit detects the occurrence of an accident while transmitting the data stored in the accident waveform data storage unit to the parent station 6. The switch slave station according to claim 4, wherein transmission of waveform data is interrupted. The waveform data storage control unit is configured so that the accident waveform data stored in the accident waveform data storage unit when the data amount stored in the accident waveform data storage unit reaches a set reference data amount. And after requesting the communication control unit to transmit the time information to the master station, when the reset command is given, it is configured to clear the stored content of the waveform data storage unit at the time of the accident,
The communication control unit, after performing the process of transmitting the waveform data at the time of accident and time information stored in the waveform data storage unit at the time of the accident in response to a request of the waveform data storage control unit, Being configured to give the reset command to the waveform data storage control unit;
The switch slave station according to claim 5 or 6. The sampling unit is configured to sample the instantaneous value of the detection signal of the system voltage detected at the installation location of the corresponding section switch,
The sampling data storage unit is configured to store the sampling value of the instantaneous value of the detection signal of the system voltage as the waveform data of the system voltage, and also store the waveform data of the system voltage,
The data storage control unit also stores the waveform data of the system voltage stored in the sampling data storage unit when the accident detection unit detects the occurrence of an accident in the accident waveform data storage unit as waveform data at the time of an accident The switch slave station according to claim 5, wherein the switch slave station is configured to be configured to be

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