JP5518926B2 - Distribution automation system - Google Patents

Description

  The present invention relates to a distribution automation system, and in particular, when a high-voltage distribution line fails due to a ground fault or a short-circuit accident, the distribution automation system controls an automatic switch arranged in the high-voltage distribution line in order to identify the accident section. It is about.

  Conventionally, in a load automation system that changes the route of a high-voltage distribution line by controlling an automatic switch in a wiring automation system that accompanies a power outage, the control screen of the wiring automation system and the change (increase / decrease) in current before and after the rolling operation It was confirmed with. FIG. 7 is a schematic diagram showing a change in current flowing in an automatic switch between substations for each procedure of a conventional rolling load operation. It is assumed that the circuit breakers CB52 and 59 are arranged in each substation, and the current ICB flows from there. The automatic switch is denoted as DM.

Before the rolling load in FIG. 7A, when DM54 is “ON” and DM56 is “OFF”, a current of ICB = 10 A flows in section 1, section 2, and section 3, respectively, and a total current of 30 A is generated. Assume that it was flowing. These current values are confirmed in advance by a distribution automation system (not shown). Next, as shown in FIG. 7B, the DM 56 is “on” controlled to execute a loop operation (a state where the substations A51 and B58 are connected). In this state, ICB = 15 A respectively flows through the distribution lines a53 and b57. And the total value substantially corresponds with 30A before rolling load. These current changes are also confirmed by the distribution automation system. Next, as shown in FIG. 7C, in order to switch the distribution line a53 (section 2) to the distribution line b57, the DM54 is "turned off" and the post-rolling operation is performed. As a result, a current of ICB = 10A flows through the distribution line a53 and ICB = 20A flows through the distribution line b57. These current changes are also confirmed by the distribution automation system. As a result, the following current changes can be confirmed.
(A) Before rolling load (b) In loop (c) After rolling load Distribution line a53: 20A->15A-> 10A
Distribution line b57: 10A->15A-> 20A
However, from substation A51 to substation B58, if all conditions such as electric wire, load current, voltage, distance, etc. are the same, the loop current will be 15A, but the actual distribution line characteristics are different. The loop current varies depending on the conditions. That is, the current does not change as described above before the rolling load, during the loop, and after the rolling load. That is, there is a problem that it is not possible to confirm whether the automatic switch is operating correctly only by a change in current, and eventually an operator must go to the site to check.

Patent Document 1 compares the line voltage measured at each terminal of the line with the phase difference of the zero-phase current and the magnitude of the zero-phase current to detect the failure section, and the failure section from the system without power failure. A failure section detection device to be separated is disclosed.
Patent Document 2 discloses a ground fault protection system that can avoid a power failure in all sections of an accident line.

JP 2007-116893 A JP 2010-161865 A

The prior art disclosed in Patent Document 1 is a system that measures and detects a fault section by measuring a line short-circuit voltage and a zero-phase current, separates the section from the fault section, and switches a healthy section to a cooperative line. The configuration is similar to that of the present application, but there is a problem that it cannot be confirmed whether or not the switch has operated normally.
In the prior art disclosed in Patent Document 2, the slave station installed for each section detects the absolute value of the zero-phase current and transmits the determination result to the power distribution control device. The power distribution control device is a system that identifies the accident section and opens the switch in the section on the power supply side from the accident section before being interrupted by the OVG relay. Similarly to the above, there is a problem that it cannot be confirmed whether or not the switch operates normally.
The present invention has been made in view of such a problem. By confirming the switching operation of the automatic switch from the change of the zero-phase voltage or the zero-phase current of the high-voltage distribution line, the switching operation can be performed accurately and quickly. It is an object of the present invention to provide a power distribution automation system capable of making a determination.

In order to solve such a problem, the present invention provides a distribution automation system that identifies and isolates an accident section and automatically transmits power to a healthy section when a high-voltage distribution line fails due to an accident. An automatic switch that is installed in each of a plurality of sections that divide the high-voltage distribution lines connecting the plurality of substations, and that detects and detects a plurality of information related to the high-voltage distribution lines. A sensor unit that outputs information, a disconnection and connection of the automatic switch when the accident occurs, and a slave station that generates measurement information from sensor information detected by the sensor unit, and a supply from the high-voltage distribution line to the slave station A distance control facility comprising a transformer for generating electric power, and a distance control master station connected to the distribution distance control facility via a communication line and controlling the distribution distance control facility. The master station The zero-phase voltage varying by disengaging the automatic switch included in the measurement information received from Noriko station, or by determining the change in increase and decrease with respect to the value of the zero-phase current, the automatic switch is instructed It is determined whether or not connected to the street, and based on the determination result , the accident section is identified and separated, and control information is transmitted to the slave station so that power is transmitted to the healthy section. It is characterized by transmitting.
In order to prevent the accident range from spreading when the high-voltage distribution line causes an accident such as a ground fault or a short circuit, the distribution automation system identifies an accident section by placing an automatic switch at a predetermined location on the high-voltage distribution line. This is a system for automatically transmitting power to a healthy section as quickly as possible by separating the accident section and the healthy section. In the present invention, a power distribution distance control facility composed of an automatic switch, a sensor unit, a slave station, and a transformer, and a distance control master station connected to a plurality of power distribution distance control facilities through a communication line are provided. Configure an automation system. When an accident occurs, measurement information is generated from the sensor information received by the slave station and transmitted to the remote control station. The remote control master station that received the information analyzes the information and identifies in which section the accident occurred. When a section is specified, the automatic switch in that section is controlled to separate the accident section from the healthy section. Furthermore, it instructs to transmit power in the healthy section. Thereby, with the occurrence of an accident, the separation of the accident section and the power transmission to the healthy section can be performed quickly and accurately.

According to a second aspect of the present invention, when the automatic switch is in a disconnected state, the slave station determines a charging state of the high-voltage distribution line from a power supply state from the transformer.
In the transformer, the power received from the high-voltage distribution lines on the power source side and load side of the automatic switch is stepped down and supplied to the slave station. Therefore, when the automatic switch is off, high voltage power is not generated on the load side, and power is supplied only from the power source side. From this, when electric power is supplied from the power source side, it can be determined that the high-voltage distribution line is charged.
According to a third aspect of the present invention, when the high-voltage distribution line goes out of power, the automatic switch is automatically turned off when power supply to the transformer is stopped.
When the high-voltage distribution line fails, high-voltage power is not supplied to the transformer, inevitably no voltage is generated from the transformer, and power is not supplied to the slave stations. Since the slave station drives the contact of the automatic switch by a relay, the contact returns to the initial position (position where the contact is opened) when power supplied to the relay is lost. Thereby, when the high-voltage distribution line is in a power failure state, the load side and the power source side of the high-voltage distribution line are automatically disconnected, so that the safety on the load side can be maintained when the power failure is restored.

According to a fourth aspect of the present invention, when the backup power source is built in the slave station and the high-voltage distribution line has a power failure, the automatic switch can be locked and monitored from the remote control master station by using the backup power source. It is characterized by that.
When the high-voltage distribution line fails, the slave station stops operating completely and the automatic switch is also disconnected. In such a case, the slave station cannot transmit measurement information to the remote control master station. Therefore, in the present invention, when a backup power source is built in the slave station and the high-voltage distribution line goes out of power, the slave station is driven by the backup power source to lock the automatic switch from the remote control master station or to monitor the state. . Thereby, even if a high voltage distribution line carries out a power failure, measurement information can be transmitted to a remote control master station.

According to the present invention, when an accident occurs, measurement information is generated from the sensor information received by the slave station and transmitted to the remote control master station. The remote control master station that has received the information analyzes the information to identify in which section the accident has occurred, and controls the automatic switch in that section to separate the accident section from the healthy section. Furthermore, since it is instructed to transmit power to the healthy section, it is possible to quickly and accurately perform the separation of the accident section and the power transmission to the healthy section when an accident occurs.
Also, the voltage, current, zero-phase voltage, zero-phase current, ground fault direction, overcurrent, and power factor information related to the high-voltage distribution line change when the high-voltage distribution line is grounded or short-circuited. By analyzing this information, it can be determined whether the high-voltage distribution line is normal or abnormal.
In addition, since the capacitance changes depending on the connection / disconnection state of the automatic switch, the magnitude of the zero-phase voltage or zero-phase current flowing there also changes, so the change in the magnitude of the zero-phase voltage or zero-phase current By confirming, it is possible to determine the connection / disconnection state of the automatic switch.
In addition, when the automatic switch is off, high voltage power is not generated on the load side, and power is supplied only from the power source side. It can be determined that the battery is charged.
Further, when the high-voltage distribution line is in a power failure state, the load side and the power source side of the high-voltage distribution line are automatically disconnected, so that safety on the load side can be maintained when the power failure is restored.
In addition, when a backup power supply is built in the slave station and the high-voltage distribution line goes out of power, the slave station is driven by the backup power supply to lock the automatic switch from the remote control master station and monitor the status. Even if the power distribution line fails, measurement information can be sent to the remote control station.

1 is a schematic block diagram of a distribution automation system according to an embodiment of the present invention. It is a block diagram which shows schematic structure of the distribution and distribution control equipment which concerns on embodiment of this invention. It is a block diagram which shows the wiring state of the power distribution distance control equipment of this invention. It is a block diagram explaining the interface of MDMR and a slave station. It is a flowchart which shows the procedure of the rolling load operation of this invention. It is a schematic diagram explaining the zero phase voltage or zero phase current which changes for every procedure of the rolling load operation of this invention. It is a schematic diagram which shows the change of the electric current which flows into the automatic switch between substations for every procedure of the conventional rolling load operation.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. .

  FIG. 1 is a schematic block diagram of a distribution automation system according to an embodiment of the present invention. The distribution automation system 50 of the present invention is a distribution automation system that identifies a fault section and separates the fault section when a high-voltage distribution line fails due to a ground fault or a short circuit accident, and automatically transmits power to a healthy section. It is installed between a high-voltage distribution line (hereinafter simply referred to as distribution line) a and distribution line b that connects between substation A1 and substation B8, and will be described later with automatic switch 20, slave station 29, and transformer The power distribution distance control facility (details will be described later) 10 and 11 and the distance control master station 13 that controls the power distribution distance control facilities 10 and 11 are configured. The two distribution distance control facilities 10 and 11 and the distance control master station 13 are connected by a communication line 12. FIG. 1 illustrates a distribution automation system with a minimum configuration as an example, but in reality, there are a large number of substations, and a number of distribution distance control facilities are installed between them. As a whole, a network is constructed. Then, the remote control master station 13 identifies the accident section based on the measurement information received from the slave station 29 in the distribution distance control equipment 10 and 11, separates the accident section, and transmits power to the healthy section. The control information is transmitted to the slave station 29 so that

  That is, the distribution automation system 50 arranges the automatic switch 20 at a predetermined location of the distribution lines a and b in order to prevent the accident range from spreading when the distribution line a or b causes an accident such as a ground fault or a short circuit. Thus, the accident section is identified, the accident section and the healthy section are separated, and the power is automatically transmitted to the healthy section as quickly as possible. In the present embodiment, the power distribution distance control facilities 10 and 11 including the automatic switch (including the sensor unit) 20, the slave station 29, and the transformer 31, the plurality of power distribution distance control facilities 10 and 11, and the communication line 12. The remote control master station 13 connected by the above configuration constitutes a power distribution automation system 50. When an accident occurs, the slave station 29 generates measurement information from the sensor information received from the sensor unit and transmits it to the remote control master station 13. The remote control master station 13 that has received the information analyzes the information and identifies in which section the accident has occurred. When the section is specified, the automatic switch 20 in the section is controlled to separate the accident section from the healthy section. Furthermore, it instructs to transmit power in the healthy section. Thereby, with the occurrence of an accident, the separation of the accident section and the power transmission to the healthy section can be performed quickly and accurately.

  FIG. 2 is a block diagram showing a schematic configuration of the distribution and distribution equipment according to the embodiment of the present invention. The distribution distance control facilities 10 and 11 of the present invention are installed in a plurality of sections that divide a distribution line connecting a plurality of substations, respectively, an automatic switch 20 that connects and disconnects the distribution line 24, and a ground fault or short circuit accident. The automatic switch 20 is connected and disconnected at the time of occurrence, and a substation 29 that generates measurement information from sensor information detected from a sensor unit (not shown), and a dual power source transformer that generates power to be supplied from the distribution line 24 to the substation 29 (Hereinafter simply referred to as a transformer) 31. In the present embodiment, it is assumed that the sensor unit is built in the automatic switch 20. The automatic switch 20 includes a contact 21 for connecting / disconnecting the distribution line 24, a spring 19 for returning the contact 21 to an initial position, a closing coil 23 for bringing the contact 21 into contact, and a holding for holding the contact 21 in contact. A coil 22 and a manual lever 14 for manually bringing the contact 21 into contact are provided. The slave station 29 includes a closing contact 28 controlled by a remote control station 13 described later, a holding contact 27 closed by the holding coil 22, and a DC power supply 30 that generates a DC voltage from 100 V generated by the transformer 31. It has. Further, a transformer 31 is provided which generates a power source for the slave station 29 by reducing the high voltage (6600V) of the power supply side distribution line 24a and the load side distribution line 24b to 100V (details will be described later).

Next, the operation of the distribution and distribution control facility according to the present embodiment will be described. In the slave station 29, when the closing contact 28 is brought into a contact state according to an instruction from the remote control master station 13 (not shown), a current flows from the DC power source 30 to the closing coil 23 and the holding coil 22 to bring the contact 21 into a contact state. At the same time, even if the holding contact 27 is in a contact state and the closing contact 28 is in a disconnected state, the contact 21 is locked by the holding coil 22. In this state, in order to turn off the contact 21, the holding contact 27 is turned off according to an instruction from the remote control station 13, or the distribution line 24 becomes a power failure, and 100 V supplied from the transformer 31 is This is when a power failure occurs. Even if the contact 21 is disconnected, the contact 21 can be manually set by the manual lever 14.
The slave station 29 of this embodiment measures sensor information detected by the sensor unit and generates measurement information. Measurement information includes voltage, current, zero-phase voltage, zero-phase current, ground fault direction, overcurrent, and power factor related to the high-voltage distribution line. Such information changes when the high-voltage distribution line 24 is grounded or short-circuited. In other words, by analyzing these pieces of information, it is possible to determine whether the high-voltage distribution line is normal or abnormal.

In addition, the transformer 31 reduces the power received from the power supply distribution line 24 a and the load distribution line 24 b of the automatic switch 20 and supplies the power to the slave station 29. Therefore, when the automatic switch 20 is off, high voltage power is not generated on the load side, and power is supplied only from the power source side. From this, when electric power is supplied from the power source side, it can be determined that the distribution line is charged.
Further, when the power distribution line fails, high voltage power is not supplied to the transformer 31, and voltage 100 V is inevitably not generated from the transformer 31, and power is not supplied to the slave station 29. Since the slave station 29 drives the contact 21 of the automatic switch 20 by a relay, the contact 21 returns to the initial position (position where the contact 21 is opened) when power supplied to the relay is lost. Thereby, when the distribution line is in a power failure state, the load side and the power source side of the distribution line are automatically disconnected, so that safety on the load side can be maintained when the power failure is restored.

FIG. 3 is a block diagram showing the wiring state of the power distribution control equipment of the present invention. The same components will be described with the same reference numerals as in FIG. The automatic switch 20 is arranged so as to connect and disconnect the distribution lines 24 a and 24 b, and a sensor signal 34 that detects a plurality of information related to the distribution line from the automatic switch 20 is input to the MDMR 37. The automatic switch 20 is connected to a control signal 33 that controls connection / disconnection of the contact 21. The transformer 31 has one input 25 connected to the power distribution line 24a and the other input 26 connected to the load distribution line 24b. A control power supply (100 V) 32 stepped down from the transformer 31 is connected to the MDMR 37. This power supply is converted into a DC voltage by the MDMR 37. Further, the MDMR 37 is provided with a cam switch 35 and a sequential input non-display LED 36. In addition, the slave station 29 is connected to the MDMR 37 and the cable 39, and is connected to a backup power source 38 when the power distribution line 24 fails. Further, a communication line 12 for transmitting / receiving information to / from the remote control master station 13 is connected.
When the power distribution line 24 is interrupted, the slave station 29 completely stops operating, and the automatic switch 20 is also disconnected. In such a case, the slave station 29 cannot transmit measurement information to the remote control master station 13. Therefore, in the present embodiment, when the backup power source 38 is built in the slave station 29 and the distribution line 24 fails, the slave station 29 is driven by the backup power source 38 to lock the automatic switch 20 from the remote control master station 13. Or monitor the status. Thereby, even if the power distribution line 24 is blacked out, measurement information can be transmitted to the remote control master station 13.

  FIG. 4 is a block diagram for explaining the interface between the MDMR and the slave station. The MDMR 37 receives the sensor signal 34 transmitted from the automatic switch 20, and the voltage, current, zero phase voltage, zero phase current, ground fault direction, overcurrent, and power factor related to the distribution line 24 are measured by the measurement unit 37a. Measure. Those pieces of measurement information are input to the logic unit 37b, and the state display LED is turned on by determining the state display. In addition, measurement information is exchanged with the slave station by serial communication. Further, the power source / control unit 37c receives the control power sources A, B, and C from the transformer 31 and converts them to a DC power source. Then, the control signal 33 transmitted from the slave station 29 is transmitted to the automatic switch 20. Further, a cam switch 35 and a sequential input non-display LED 36 are provided.

FIG. 5 is a flowchart showing the procedure of the rolling load operation of the present invention. FIG. 6 is a schematic diagram for explaining a zero-phase voltage or a zero-phase current that changes for each procedure of the rolling load operation of the present invention. The substation A1 is provided with a circuit breaker CB2 and the substation B8 is provided with a circuit breaker CB9. The substation A1 and the substation B8 are connected by a distribution line a and a distribution line b. DM6 is arranged. In addition, there are electrostatic capacitances Ca and Cb between the distribution line a and DM4 between the ground and between DM4 and DM6, there are electrostatic capacitances Cc and Cd between the ground and DM6 and the distribution line b. , It is assumed that capacitances Ce and Cf exist with the ground. For convenience of explanation, the section between substations A1 and DM4 is referred to as section a, the section between DM4 and DM6 is referred to as section b, and the section between DM6 and substation B8 is referred to as section c.
First, in the state of FIG. 6A, the zero-phase current and zero-phase voltage of the distribution line a and distribution line b before the rolling load are confirmed on the remote control station 17 side (not shown) (S1). In this case, the zero-phase current and zero-phase voltage of the distribution line a are values proportional to the capacitances Ca to Cd existing there. Further, the zero-phase current and the zero-phase voltage of the distribution line b are values proportional to the capacitances Ce to Cf existing there.

Next, as shown in FIG. 6B, the DM 6 is set to the “ON” state (S2). In the loop, the characteristics of the distribution lines a and b (type of distribution line, distance, etc.) differ in the loop point 10 (the point where the voltage and current are balanced when the distribution lines a and b are connected). Therefore, in FIG. 6B, it is set as the center point. This state is determined by the remote control master station 17, and it is determined whether or not the zero-phase current and the zero-phase voltage have changed (increase / decrease) (S3). That is, by setting DM6 to the “ON” state, the zero-phase current and zero-phase voltage of the distribution line a become values proportional to the capacitances Ca to Cc existing there. Further, the zero-phase current and the zero-phase voltage of the distribution line b are values proportional to the capacitances Cd to Cf existing there.
When the zero-phase current and the zero-phase voltage change in step S3d (Yes in S3), a control signal for turning off DM4 is transmitted from the remote control master station 17 to the corresponding slave station (S4). As a result, the distribution line a is separated, and power is transmitted to the section b and the section c by the sound distribution line b. Also in this case, the zero-phase current and the zero-phase voltage of the distribution line a are values proportional to the capacitances Ca to Cb existing there. Further, the zero-phase current and zero-phase voltage of the distribution line b are values proportional to the capacitances Cc to Cf existing there.

On the other hand, if the zero-phase current and the zero-phase voltage do not change in step S3 (No in S3), no control signal is transmitted from the remote control master station 17 to the DM 4 (S5).
During the rolling load operation, the zero-phase current and zero-phase voltage values are displayed in a dialog on the screen of the remote control station so that they can be confirmed visually. Thus, by enabling automatic execution by the distribution automation system, it is possible to surely confirm the state of connection / disconnection instruction of the automatic switch of the target distribution line at the time of the rolling load operation, and a safer operation operation is possible.
In the electric power system, there is a capacitance between the overhead wires and cables and the ground. The capacitance exists in each distribution line, and its magnitude is proportional to the magnitude of the zero-phase voltage or zero-phase current. Therefore, the change in the capacitance of the power system can be confirmed by examining the change in the magnitude of the zero-phase voltage or the zero-phase current. That is, since the capacitance changes depending on the connection / disconnection state of the automatic switch 20, the magnitude of the zero-phase voltage or the zero-phase current flowing therethrough also changes. By confirming the change, the connection / disconnection state of the automatic switch can be determined.

  1 Substation A, 2, 9 CB, 3, 5 Distribution line a, 4, 6 DM, 7 Distribution line b, 8 Substation B, 10, 11 Distribution distance control equipment, 12 Communication line, 13 Distance control station, 14 Manual Lever, 20 Automatic Switch, 21 Contacts, 22 Holding Coil, 23 Input Coil, 24 Distribution Line, 25 Power Distribution Line, 26 Load Distribution Line, 27 Holding Contact, 28 Input Contact, 29 Slave Station, 30 DC Power supply, 31 Transformer, 32 Control power supply, 33 Control signal, 34 Sensor signal, 35 Cam switch, 36 No turn-on display LED, 37 MDMR, 38 Backup power supply, 39 Interface, 50 Distribution automation system

Claims (4)

When a high-voltage distribution line has a power failure due to an accident, it is a distribution automation system that identifies and isolates the accident section and automatically transmits power to a healthy section,
An automatic switch that is installed in each of a plurality of sections that divide the high-voltage distribution lines connecting between a plurality of substations, and that detects and detects a plurality of information related to the high-voltage distribution lines as sensor information A sensor unit for outputting, a slave station for connecting and disconnecting the automatic switch when the accident occurs, and generating measurement information from sensor information detected by the sensor unit, and power supplied to the slave station from the high-voltage distribution line Power distribution control equipment with a transformer to generate,
A distance control master station connected to the distribution distance control facility via a communication line and controlling the distribution distance control facility,
The remote control master station determines an increase / decrease change with respect to the zero-phase voltage or the zero-phase current value that changes due to the connection / disconnection of the automatic switch included in the measurement information received from the slave station. To determine whether or not the automatic switch has been connected or disconnected as instructed, and based on the determination result , the accident section is identified and separated, and the power is transmitted to the healthy section. A distribution automation system characterized by transmitting control information to a slave station.   2. The distribution automation system according to claim 1, wherein the slave station determines a charging state of the high-voltage distribution line from a supply state of power from the transformer when the automatic switch is in a disconnected state. .   2. The distribution automation system according to claim 1, wherein when the high-voltage distribution line goes out of power, the automatic switch is automatically turned off by stopping power supply to the transformer. 3.   A backup power supply is built in the slave station, and when the high-voltage distribution line goes out of power, the automatic switch can be locked and monitored from the remote control station by using the backup power supply. The distribution automation system according to any one of claims 1 to 3.

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