WO2005064562A1 - Multi-function electric power supply automation system that use plc modem - Google Patents

Multi-function electric power supply automation system that use plc modem Download PDF

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Publication number
WO2005064562A1
WO2005064562A1 PCT/KR2004/003397 KR2004003397W WO2005064562A1 WO 2005064562 A1 WO2005064562 A1 WO 2005064562A1 KR 2004003397 W KR2004003397 W KR 2004003397W WO 2005064562 A1 WO2005064562 A1 WO 2005064562A1
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WO
WIPO (PCT)
Prior art keywords
electric power
power distribution
distribution automation
data
electric
Prior art date
Application number
PCT/KR2004/003397
Other languages
French (fr)
Inventor
Weon-Young Jang
Original Assignee
Sodiff E & T Co., Ltd
Woolim Dasys Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sodiff E & T Co., Ltd, Woolim Dasys Co., Ltd filed Critical Sodiff E & T Co., Ltd
Publication of WO2005064562A1 publication Critical patent/WO2005064562A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D4/00—Tariff metering apparatus
    • G01D4/002—Remote reading of utility meters
    • G01D4/004—Remote reading of utility meters to a fixed location
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2513—Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/30—Smart metering, e.g. specially adapted for remote reading

Definitions

  • the present invention relates to a multi-function electric power distribution automation system using a power line communication (PLC) modem, which constructs an independent system using electric power distribution automation terminals including PLC modems in order to remotely check the meter of a consumer, remotely monitor and control a line switch, manage a transformer and detect a failed section of an electric power supply line when the electric power supply line has, a trouble, to thereby extend the range of electric power supply.
  • PLC power line communication
  • the present invention relates to a multi-function electric power distribution automation system using a PLC modem, which includes electric power distribution automation terminals having PLC modems, a low-voltage power line for transmitting data through the PLC modems, and an electric power distribution management system for remotely controlling transformers and the electric power distribution automation terminals.
  • electric power distribution automation which means remote distribution system monitoring control, usually monitors a trip of a line switch and estimates a failed section of a line when the line has a trouble to remotely switch the line switch so as to reduce a service interruption range (an inspection range for detecting a failed point) .
  • a service interruption range an inspection range for detecting a failed point
  • This trouble management method takes the magnitude of fault current into account or detects the operation state of the line switch to estimate a failed section and puts a line switch into the failed .section to confirm the failed section and separate it. When the failed section is confirmed, the area having the trouble is found in order to find out the cause of the trouble and recover the failed section.
  • a remote metering system using a wireless mobile communication network such as CDMA and PCS has been developed and remote metering for high voltage consumption has been partly performed.
  • a remote metering system using various methods including RF communication, telephone lines, wired/wireless Internet and so on has been developed and proposed.
  • this system has not been spread because of the costs required for construction of communication infrastructure . and communications.
  • a method of newly constructing an optical communication network for multifunction electric power distribution automation is being proposed, this method is not economical. Accordingly, economical problems and problems in construction must be solved preferentially in order to enable remote metering.
  • prior arts proposed the method of acquiring supervision data of electric power supply load devices and metering data of each consumer and remotely collecting the acquired data through a predetermined wireless mobile communication network or wired/wireless Internet.
  • it is difficult to practically use the conventional method because costs needed for communications and construction of communication lines connected to remote places are generated.
  • the present invention has been made to solve the above problems occurring 1 in the prior art, and it is an object the present invention to provide an electric power distribution automation system, which installs an electric power distribution automation terminal including a PLC modem at each electric pole in the current system of supplying electric power from a substation, connects a power line for power line communication between electric power distribution automation terminals to collect secondary voltage and current data of a transformer, collects metering data from each consumer via PLC communication and allows a remote electric power distribution management system to collect and process the data through relay between adjacent electric poles, to thereby operate electric power distribution automation at low construction and operation costs.
  • Another object of the present invention is to provide an electric power distribution automation system, which transmits a correct fault point through local area wireless communication using an RF module included in the electric power distribution automation terminal to the remote electric power distribution management system when interruption of electric power is generated due to a line trouble to control recognition of the line trouble and the place having the trouble, operation state and operation response of a line switch.
  • Another object of the present invention is to newly install a power line of approximately 2m/m between electric poles for power line communication without newly constructing an optical communication network for multi- function electric power distribution automation, to facilitate the maintenance of electric power distribution automation system and improve economical effect.
  • the present invention provides a multJL-function electric power distribution automation system using a power line communication (PLC) modem, which constxucts an independent system using electric power distribution automation terminals including PLC modems in order to remotely check the meter of a consumer, remotely monitor and control a line switch, manage a transformer and detect a failed section of an electric power supply line when the electric power supply line has a trouble, to thereby extend the range of electric power supply.
  • PLC power line communication
  • the present invention provides a multi-function electric power distribution automation system using a PLC modem, which includes electric power distribution automation terminals having PLC modems, a low- voltage power line for transmitting data through the PLC modems, and an electric power distribution management system for remotely controlling transformers and the electric power distribution automation terminals.
  • the electric power distribution automation terminal is installed at each electric pole, monitors the secondary load of a transformer and carries out power line communication with a watthour meter, a controller and a load switch, which are electrically connected to the secondary side of the transformer, to control the watthour meter, controller and load switch and acquire metering data of the watthour meter and supervision data of the watthour meter, controller and load switch.
  • the electric power distribution automation terminal includes a PLC modem that enables power line communication via a power line. Furthermore, the electric power distribution automation terminal processes and relays a control signal of the remote electric power distribution management system, transmits acquired data, and relays data received from other electric power distribution automation terminals. Moreover, the electric power distribution automation terminal includes an RF module and, in the event of interruption of electric power due to a line trouble or other reasons, transmits the correct location of the trouble to the remote electric power distribution management system through local area wireless communication, to deliver data about the line trouble and location of trouble, operation state and operation response of the line switch to the electric power distribution management system.
  • the power line is a low-voltage power line that is extended from the end point of a low-voltage power line of an electric pole to a low-voltage power line of the next electric pole and coupled to a condenser, a line coupler or a PLC repeater included in the electric power distribution automation terminal installed at each electric pole. In this manner, the power line is connected to the PLC modem
  • the low-voltage power line is used as the power line in order to pass a communication frequency and prevent interference between neighboring electric poles to prepare against accidents. While the power line for power line communication, connected between adjacent electric poles, can be attached to the main power supply line irrespective of presence or absence of a low-voltage power line in preparation for the case where new electric poles will be added, the electric power distribution automation terminal must include a part serving as an interface between the power line and PLC modem, such as a condenser, a line coupler or a PLC repeater.
  • the line coupler filters only an information signal component from a signal including a power signal (220V, 60Hz) and the information signal loaded on the power line, insulates the power signal from the PLC modem, and loads the information signal generated by the PLC modem on the power signal.
  • a high-voltage power line can be used as a medium of power line communication.
  • the electric power distribution management system ⁇ s connected to the electric power distribution automation terminal through the low-voltage power line.
  • the electric power distribution management system controls the electric power distribution automation terminal and devices electrically connected to the terminal, and stores, analyzes and processes supervision data of a distribution load or supervision data of the devices, obtained through power line communication, and watthour meter metering data .
  • Identification information is given to the electric power distribution automation terminal installed at each electric pole and communication object information making an adjacent electric power distribution automation termina.1 as a PLC object is set to the electric power distribution automation terminal such that data is sequentially relayed and transmitted according to the terminal set as the communication object when an event is generated at the request of the electric power distribution management system or in response to a supervision result to relay the control signal of the final electric power supply system.
  • FIG. 1 shows the construction of a multi-function electric power distribution automation system according to the present invention
  • FIG. 2 shows an example of data transmitted using PLC according to the present invention
  • FIG. 3 is a block diagram of the PC interface according to the present invention.
  • FIG. 1 shows the construction of a multi-function electric power distribution automation system according to the present invention.
  • the multi-function electric power distribution automation system includes a plurality of electric power distribution automation terminals 300 each of which is installed at an electric pole 200 and includes a communication means electrically connected to a load monitoring unit at the secondary side of a transformer 100 to perform communication and a PLC modem through which power line communication with an adjacent electric power distribution automation terminal 300 is carried out, a low- voltage power line 600 for data transmission between the electric power distribution automation terminals, and a power distribution management system 400 for storing, calculating and processing data transmitted from the electric power distribution automation terminals 300 and controlling devices connected to the electric power distribution automation terminals 300.
  • the electric power distribution automation terminals are installed close to the low-voltage power lines of the respective electric poles 200.
  • the electric power distribution automation terminals 300 can be located within a visibility range from upper or lower electric power distribution automation terminals if circumstances allow to improve the wireless RF data communication environment.
  • the power distribution management system 400 includes a PC interface 410 and a control PC 420.
  • the PC interface 410 outputs data received from the electric power distribution automation terminals 300 for transmission to the control PC 420.
  • the control PC generates a control signal, stores and calculates data received through the PC interface 410. Referring to FIG.
  • the PC interface 410 includes a CPU 412, a PLC ' modem 415, an RF module 411, an RS232C connector 413, and a power supply 414.
  • the CPU controls the output of the control signal transmitted from the control PC ' 420 through the PLC modem 415 used for carrying out power line communication with the electric power distribution automation terminals 300 and the output of the data transmitted from the electric power distribution automation terminals 300 to the control PC 420.
  • the PLC modem 415 is used for power line communication in a normal state.
  • the RF module 411 used for local area wireless communication in the event of interruption of electric power.
  • the RS232C connector 413 is used as an input/output interface for serial data communication with the control PC 420.
  • the power supply 414 provides power to the components of the PC' interface 410.
  • the electric power distribution automation terminals 300 installed at respective electric poles 200 sequentially perform power line communication with adjacent electric power distribution automation terminals 300 such that the control signal of the power distribution management system 400 and supervision data acquired from the electric power distribution automation terminals 300 are relayed and transmitted while passing the electric power distribution automation terminals 300.
  • the voltage of each phase of the secondary side of the transformer 100 is provided to the corresponding electric power 'distribution automation terminal 300, and a unit for monitoring a load at the secondary side of the transformer 100 includes a current transformer CT for detecting each phase current of the transformer, an image current transformer Z-CT installed on a common neutral line to detect the position of a line trouble, and a temperature sensor for sensing the temperature of the transformer 100.
  • the present invention transmits data through power line communication between the electric power distribution automation terminals respectively installed at the electric poles and allows the electric power distribution automation terminals sequentially relay the data to the upper electric power distribution management system 400 or lower electric power distribution automation terminals.
  • the electric power distribution automation terminals have a function of partly or thoroughly sensing the temperature, load current for each phase and voltage of the transformer and fault grounding currents of lines.
  • the electric power distribution automation terminals 300 perform power line communication with devices including a controller, a load switch and a watthour meter, installed at the secondary side of the transformer, to obtain desired data or remotely control the devices.
  • each electric power distribution automation terminal 300 including the PLC modem is installed close to the low-voltage power line of each electric pole 200 having the transformer 100 such that the low-voltage power line is connected to the PLC modem.
  • the low-voltage power line is connected to the PLC modem of an upper or lower electric power distribution automation terminal 300. That is, the electric power distribution automation terminal 300 located at the position ⁇ c' carries out power line communication with the upper electric power distribution automation terminal 300 located at the position b' and the lower electric power distribution automation terminal 300 placed at the position ⁇ d' . Accordingly, data of the electric power distribution automation terminal 300 at the position ⁇ c' is transmitted in the order of c ⁇ b ⁇ a — * ⁇ power distribution management system 400.
  • electric power distribution automation terminals 300 have their own IDs such that they can be identified.
  • the PLC modem included in each electric power distribution automation terminal 300 is electrically connected to the secondary side of the transformer 100 to receive control and current state data through power line communication with various devices such as a controllers, a load switches and a watthour meter including a PLC modem.
  • Each electric power distribution automation terminal 300 basically stores specified voltage and sets information of the transformer 100 managed the terminal 300, such as rated current and allowable temperature of the transformer 100.
  • the electric power distribution automation terminal 300 uses the information of the transformer as a condition for determining whether an event is generated.
  • the event includes deviation from specified voltage or zero voltage, exceeding a specified rated load current, exceeding a specified temperature, and sensing s fault grounding current .
  • the RF module included in the electric power distribution automation terminal 300 is converted into a transmission mode and data including the ID of the electric power distribution automation terminal 300 and the ID of the upper terminal is transmitted to the RF module of the upper electric power distribution automation terminal because data cannot be transmitted through power line communication.
  • the electric power distribution automation terminal determines whether the ID of the upper electric power distribution automation terminal and the ID of a control object, included in the received signal, correspond to information thereof and, when the IDs correspond to the information, performs an operation corresponding to the control signal.
  • the electric power distribution automation terminal carries out a relay function of transmitting data including its ID and the ID of the control object to the lower electric power distribution automation terminal. That is, the power distribution management system 400 transmits control signals for controlling the devices together with the ID of the control object to control the devices through the aforementioned process.
  • the electric power distribution automation terminal receives a signal from the lower electric power distribution automation terminal, the electric power distribution automation terminal compares its ID with the ID of the lower terminal and, when they are identical to each other, relays the received signal to the upper terminal. When the two IDs do not correspond to each other, the electric power distribution automation terminal ignores the received signal. When the electric power distribution automation terminal relays the received signal to the upper terminal, the electric power distribution automation terminal transmits data including its ID and the ID of the upper terminal to the upper terminal.
  • the electric power distribution automation terminal 300 located at the final position ⁇ a' sets the PC interface 410 of the power distribution management system 400 as the upper terminal so that the final electric power distribution automation terminal 300 transmits data to the PC interface 410.
  • the PC interface 410 transmits the received data to the control PC 420 connected thereto through serial communication.
  • the control PC 420 stores, calculates and processes the received data.
  • the above-described multi-function electric power distribution automation system using PLC enables integrative remote metering of all data using electric power of an electric power company, such as gas, sewage and wastewater, water supply, reclaimed water, hot water supply and electricity, as shown in FIG. 2.
  • the multi-function electric power distribution automation system of the present invention can provide services including gas leakage detection, fire detection, monitoring intruders and robbery to consumers.
  • Industrial Applicability As described above, the present invention can online- collect data about the operation of distribution lines through one collecting window and remotely manage transformers to enable remote supervision and remote metering.
  • the multi-function electric power distribution automation system of the present invention does not require line inspection for detecting a troubled point and thus the time for which electric power is interrupted can be remarkably reduced.
  • the multifunction electric power distribution automation system can be connected with a high-voltage remote metering system to effectively perform load management in real time.
  • the present invention can transmit a correct troubled spot to a remotely located power distribution management system through wireless communication using the RF module included in the electric power distribution automation terminal to detect the generation of line trouble and the troubled position in real time.
  • the multi-function electric power distribution automation system when used in connection with a watthour meter using a PLC modem, remote metering can be carried out and even a grounding accident after the secondary side of a transformer can be remotely detected. In addition, a behavior of illegally installing electric facilities without having contract with an electric power company can be detected in real time to prevent transformer damage and distribution loss. Moreover, the multi-function electric power distribution automation system is more economical than the conventional system using a wireless mobile communication network, wired/wireless Internet or optical communication network. While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention.

Abstract

Disclosed herein is an electric power distribution automation system that can be easily applied to a general power supply system for supplying electric power from a substation. The electric power distribution automation system collects voltage and current data transmitted to the secondary load device of a transformer of an electric pole and metering data from each consumer and transmits the collected data to a remotely located power distribution management system through power line communication using a PLC modem included in an electric power distribution automation terminal, to enable remote management and operation. The electric power distribution automation system can online-collect data about the operation of distribution lines through one collecting window and remotely manage transformers enable remote monitoring and remote metering. Furthermore, the multi-function electric power distribution automation system does not require line inspection for detecting a troubled point and thus the time for which electric power is interrupted can be remarkably reduced.

Description

MULTI-FUNCTION ELECTRIC POWER SUPPLY AUTOMATION SYSTEM THAT USE PLC MODEM
Technical Field The present invention relates to a multi-function electric power distribution automation system using a power line communication (PLC) modem, which constructs an independent system using electric power distribution automation terminals including PLC modems in order to remotely check the meter of a consumer, remotely monitor and control a line switch, manage a transformer and detect a failed section of an electric power supply line when the electric power supply line has, a trouble, to thereby extend the range of electric power supply. More particularly, the present invention relates to a multi-function electric power distribution automation system using a PLC modem, which includes electric power distribution automation terminals having PLC modems, a low-voltage power line for transmitting data through the PLC modems, and an electric power distribution management system for remotely controlling transformers and the electric power distribution automation terminals.
Background Art In general, electric power distribution automation, which means remote distribution system monitoring control, usually monitors a trip of a line switch and estimates a failed section of a line when the line has a trouble to remotely switch the line switch so as to reduce a service interruption range (an inspection range for detecting a failed point) . When an electric power supply line has a trouble, a large current flows such that a line switch or a supervision relay of a substation can recognize the trouble. This trouble management method takes the magnitude of fault current into account or detects the operation state of the line switch to estimate a failed section and puts a line switch into the failed .section to confirm the failed section and separate it. When the failed section is confirmed, the area having the trouble is found in order to find out the cause of the trouble and recover the failed section. However, a wide area should be searched when there is no eyewitness and, in the case of fault recovery instantaneous trouble, its cause cannot be found out. To manage the load, temperature, voltage and load unbalance of a transformer installed at an electric pole, a periodical spot measurement has been carried out. Recently, an alarm or an infrared temperature checker has been used together with the spot measurement. This increases necessity for an electric power distribution automation system that enables remote management through electric power distribution automation. While electricity, water supply, reclaimed wastewater, hot water, gas, sewage and wastewater have been metered by spot measurement, a remote metering system gradually replace the spot measurement. In the case of electricity, a remote metering system using a wireless mobile communication network such as CDMA and PCS has been developed and remote metering for high voltage consumption has been partly performed. In the case of low voltage consumption, a remote metering system using various methods including RF communication, telephone lines, wired/wireless Internet and so on has been developed and proposed. However, this system has not been spread because of the costs required for construction of communication infrastructure . and communications. Furthermore, though a method of newly constructing an optical communication network for multifunction electric power distribution automation is being proposed, this method is not economical. Accordingly, economical problems and problems in construction must be solved preferentially in order to enable remote metering. As described above, prior arts proposed the method of acquiring supervision data of electric power supply load devices and metering data of each consumer and remotely collecting the acquired data through a predetermined wireless mobile communication network or wired/wireless Internet. However, it is difficult to practically use the conventional method because costs needed for communications and construction of communication lines connected to remote places are generated.
Disclosure of Invention Accordingly, the present invention has been made to solve the above problems occurring1 in the prior art, and it is an object the present invention to provide an electric power distribution automation system, which installs an electric power distribution automation terminal including a PLC modem at each electric pole in the current system of supplying electric power from a substation, connects a power line for power line communication between electric power distribution automation terminals to collect secondary voltage and current data of a transformer, collects metering data from each consumer via PLC communication and allows a remote electric power distribution management system to collect and process the data through relay between adjacent electric poles, to thereby operate electric power distribution automation at low construction and operation costs. ( Another object of the present invention is to provide an electric power distribution automation system, which transmits a correct fault point through local area wireless communication using an RF module included in the electric power distribution automation terminal to the remote electric power distribution management system when interruption of electric power is generated due to a line trouble to control recognition of the line trouble and the place having the trouble, operation state and operation response of a line switch. Another object of the present invention is to newly install a power line of approximately 2m/m between electric poles for power line communication without newly constructing an optical communication network for multi- function electric power distribution automation, to facilitate the maintenance of electric power distribution automation system and improve economical effect. The present invention provides a multJL-function electric power distribution automation system using a power line communication (PLC) modem, which constxucts an independent system using electric power distribution automation terminals including PLC modems in order to remotely check the meter of a consumer, remotely monitor and control a line switch, manage a transformer and detect a failed section of an electric power supply line when the electric power supply line has a trouble, to thereby extend the range of electric power supply. More particularly, the present invention provides a multi-function electric power distribution automation system using a PLC modem, which includes electric power distribution automation terminals having PLC modems, a low- voltage power line for transmitting data through the PLC modems, and an electric power distribution management system for remotely controlling transformers and the electric power distribution automation terminals. The electric power distribution automation terminal is installed at each electric pole, monitors the secondary load of a transformer and carries out power line communication with a watthour meter, a controller and a load switch, which are electrically connected to the secondary side of the transformer, to control the watthour meter, controller and load switch and acquire metering data of the watthour meter and supervision data of the watthour meter, controller and load switch. The electric power distribution automation terminal includes a PLC modem that enables power line communication via a power line. Furthermore, the electric power distribution automation terminal processes and relays a control signal of the remote electric power distribution management system, transmits acquired data, and relays data received from other electric power distribution automation terminals. Moreover, the electric power distribution automation terminal includes an RF module and, in the event of interruption of electric power due to a line trouble or other reasons, transmits the correct location of the trouble to the remote electric power distribution management system through local area wireless communication, to deliver data about the line trouble and location of trouble, operation state and operation response of the line switch to the electric power distribution management system. The power line is a low-voltage power line that is extended from the end point of a low-voltage power line of an electric pole to a low-voltage power line of the next electric pole and coupled to a condenser, a line coupler or a PLC repeater included in the electric power distribution automation terminal installed at each electric pole. In this manner, the power line is connected to the PLC modem
• of the electric power distribution automation terminal to carry out power line communication. The low-voltage power line is used as the power line in order to pass a communication frequency and prevent interference between neighboring electric poles to prepare against accidents. While the power line for power line communication, connected between adjacent electric poles, can be attached to the main power supply line irrespective of presence or absence of a low-voltage power line in preparation for the case where new electric poles will be added, the electric power distribution automation terminal must include a part serving as an interface between the power line and PLC modem, such as a condenser, a line coupler or a PLC repeater. The line coupler filters only an information signal component from a signal including a power signal (220V, 60Hz) and the information signal loaded on the power line, insulates the power signal from the PLC modem, and loads the information signal generated by the PLC modem on the power signal. In the case of non-grounding electric power supply line, there is no need for the power line for power line communication to be installed between electric poles but a high-voltage power line can be used as a medium of power line communication. The electric power distribution management system ±s connected to the electric power distribution automation terminal through the low-voltage power line. The electric power distribution management system controls the electric power distribution automation terminal and devices electrically connected to the terminal, and stores, analyzes and processes supervision data of a distribution load or supervision data of the devices, obtained through power line communication, and watthour meter metering data . Identification information is given to the electric power distribution automation terminal installed at each electric pole and communication object information making an adjacent electric power distribution automation termina.1 as a PLC object is set to the electric power distribution automation terminal such that data is sequentially relayed and transmitted according to the terminal set as the communication object when an event is generated at the request of the electric power distribution management system or in response to a supervision result to relay the control signal of the final electric power supply system.
Brief Description of the Drawings Further objects and advantages of the invention can be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. 1 shows the construction of a multi-function electric power distribution automation system according to the present invention; FIG. 2 shows an example of data transmitted using PLC according to the present invention; and FIG. 3 is a block diagram of the PC interface according to the present invention.
Best Mode for Carrying Out the Invention The present invention will now be described in detail in connection with preferred embodiments with reference to the accompanying drawings . FIG. 1 shows the construction of a multi-function electric power distribution automation system according to the present invention. The multi-function electric power distribution automation system includes a plurality of electric power distribution automation terminals 300 each of which is installed at an electric pole 200 and includes a communication means electrically connected to a load monitoring unit at the secondary side of a transformer 100 to perform communication and a PLC modem through which power line communication with an adjacent electric power distribution automation terminal 300 is carried out, a low- voltage power line 600 for data transmission between the electric power distribution automation terminals, and a power distribution management system 400 for storing, calculating and processing data transmitted from the electric power distribution automation terminals 300 and controlling devices connected to the electric power distribution automation terminals 300. Preferably, the electric power distribution automation terminals are installed close to the low-voltage power lines of the respective electric poles 200. To improve reliability of local area wireless communication, the electric power distribution automation terminals 300 can be located within a visibility range from upper or lower electric power distribution automation terminals if circumstances allow to improve the wireless RF data communication environment. Furthermore, it is possible to. install an antenna at the upper part of the electric pole 200 to improve the RF data communication environment. The power distribution management system 400 includes a PC interface 410 and a control PC 420. The PC interface 410 outputs data received from the electric power distribution automation terminals 300 for transmission to the control PC 420. The control PC generates a control signal, stores and calculates data received through the PC interface 410. Referring to FIG. 3, the PC interface 410 includes a CPU 412, a PLC ' modem 415, an RF module 411, an RS232C connector 413, and a power supply 414. The CPU controls the output of the control signal transmitted from the control PC' 420 through the PLC modem 415 used for carrying out power line communication with the electric power distribution automation terminals 300 and the output of the data transmitted from the electric power distribution automation terminals 300 to the control PC 420. The PLC modem 415 is used for power line communication in a normal state. The RF module 411 used for local area wireless communication in the event of interruption of electric power. The RS232C connector 413 is used as an input/output interface for serial data communication with the control PC 420. The power supply 414 provides power to the components of the PC' interface 410. In response to the generation of event or at the request of the electric power distribution management system 400, the electric power distribution automation terminals 300 installed at respective electric poles 200 sequentially perform power line communication with adjacent electric power distribution automation terminals 300 such that the control signal of the power distribution management system 400 and supervision data acquired from the electric power distribution automation terminals 300 are relayed and transmitted while passing the electric power distribution automation terminals 300. The voltage of each phase of the secondary side of the transformer 100 is provided to the corresponding electric power 'distribution automation terminal 300, and a unit for monitoring a load at the secondary side of the transformer 100 includes a current transformer CT for detecting each phase current of the transformer, an image current transformer Z-CT installed on a common neutral line to detect the position of a line trouble, and a temperature sensor for sensing the temperature of the transformer 100. The present invention transmits data through power line communication between the electric power distribution automation terminals respectively installed at the electric poles and allows the electric power distribution automation terminals sequentially relay the data to the upper electric power distribution management system 400 or lower electric power distribution automation terminals. The electric power distribution automation terminals have a function of partly or thoroughly sensing the temperature, load current for each phase and voltage of the transformer and fault grounding currents of lines. In addition, the electric power distribution automation terminals 300 perform power line communication with devices including a controller, a load switch and a watthour meter, installed at the secondary side of the transformer, to obtain desired data or remotely control the devices. ' The operation of the multi-function electric power distribution automation system of the present invention will now be explained with reference to the attached drawings . First of all, the operation of the multi-function electric power distribution automation system using power line communication when electricity is normally supplied is described. As shown in FIG. 1, each electric power distribution automation terminal 300 including the PLC modem is installed close to the low-voltage power line of each electric pole 200 having the transformer 100 such that the low-voltage power line is connected to the PLC modem. The low-voltage power line is connected to the PLC modem of an upper or lower electric power distribution automation terminal 300. That is, the electric power distribution automation terminal 300 located at the position λc' carries out power line communication with the upper electric power distribution automation terminal 300 located at the position b' and the lower electric power distribution automation terminal 300 placed at the position λd' . Accordingly, data of the electric power distribution automation terminal 300 at the position Λc' is transmitted in the order of c → b → a — *■ power distribution management system 400. Here, electric power distribution automation terminals 300 have their own IDs such that they can be identified. The PLC modem included in each electric power distribution automation terminal 300 is electrically connected to the secondary side of the transformer 100 to receive control and current state data through power line communication with various devices such as a controllers, a load switches and a watthour meter including a PLC modem. Each electric power distribution automation terminal 300 basically stores specified voltage and sets information of the transformer 100 managed the terminal 300, such as rated current and allowable temperature of the transformer 100. Thus, when there is a problem in phase voltage and current values of the secondary side of the transformer 100, the electric power distribution automation terminal 300 uses the information of the transformer as a condition for determining whether an event is generated. Here, the event includes deviation from specified voltage or zero voltage, exceeding a specified rated load current, exceeding a specified temperature, and sensing s fault grounding current . When the event is generated, interruption of electric power is generated due to a line trouble, or power line communication is impossible, the RF module included in the electric power distribution automation terminal 300 is converted into a transmission mode and data including the ID of the electric power distribution automation terminal 300 and the ID of the upper terminal is transmitted to the RF module of the upper electric power distribution automation terminal because data cannot be transmitted through power line communication. A method of transmitting and receiving data between the electric power distribution automation terminals 300 using the PLC modem or RF module will now be explained. When an electric power distribution automation terminal receives a control signal from the upper electric power distribution ■ automation terminal 300, the electric power distribution automation terminal determines whether the ID of the upper electric power distribution automation terminal and the ID of a control object, included in the received signal, correspond to information thereof and, when the IDs correspond to the information, performs an operation corresponding to the control signal. When the IDs no not correspond to the information of the electric power distribution automation terminal, the electric power distribution automation terminal carries out a relay function of transmitting data including its ID and the ID of the control object to the lower electric power distribution automation terminal. That is, the power distribution management system 400 transmits control signals for controlling the devices together with the ID of the control object to control the devices through the aforementioned process. When. the electric power distribution automation terminal receives a signal from the lower electric power distribution automation terminal, the electric power distribution automation terminal compares its ID with the ID of the lower terminal and, when they are identical to each other, relays the received signal to the upper terminal. When the two IDs do not correspond to each other, the electric power distribution automation terminal ignores the received signal. When the electric power distribution automation terminal relays the received signal to the upper terminal, the electric power distribution automation terminal transmits data including its ID and the ID of the upper terminal to the upper terminal. The electric power distribution automation terminal 300 located at the final position λa' sets the PC interface 410 of the power distribution management system 400 as the upper terminal so that the final electric power distribution automation terminal 300 transmits data to the PC interface 410. The PC interface 410 transmits the received data to the control PC 420 connected thereto through serial communication. The control PC 420 stores, calculates and processes the received data. The above-described multi-function electric power distribution automation system using PLC enables integrative remote metering of all data using electric power of an electric power company, such as gas, sewage and wastewater, water supply, reclaimed water, hot water supply and electricity, as shown in FIG. 2. Furthermore, the multi-function electric power distribution automation system of the present invention can provide services including gas leakage detection, fire detection, monitoring intruders and robbery to consumers. Industrial Applicability As described above, the present invention can online- collect data about the operation of distribution lines through one collecting window and remotely manage transformers to enable remote supervision and remote metering. Furthermore, the multi-function electric power distribution automation system of the present invention does not require line inspection for detecting a troubled point and thus the time for which electric power is interrupted can be remarkably reduced. Moreover, the multifunction electric power distribution automation system can be connected with a high-voltage remote metering system to effectively perform load management in real time. Particularly, in the event of interruption of electric power due to a line trouble, the present invention can transmit a correct troubled spot to a remotely located power distribution management system through wireless communication using the RF module included in the electric power distribution automation terminal to detect the generation of line trouble and the troubled position in real time. Furthermore, when the multi-function electric power distribution automation system is used in connection with a watthour meter using a PLC modem, remote metering can be carried out and even a grounding accident after the secondary side of a transformer can be remotely detected. In addition, a behavior of illegally installing electric facilities without having contract with an electric power company can be detected in real time to prevent transformer damage and distribution loss. Moreover, the multi-function electric power distribution automation system is more economical than the conventional system using a wireless mobile communication network, wired/wireless Internet or optical communication network. While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention.

Claims

What Is Claimed Is :
1. A multi-function electric power distribution automation system using a PLC mode for remotely monitoring and controlling a distribution system, comprising : electric power distribution automation terminals each of which ' is installed at an electric pole to perform power line communication together with devices electrically connected to the secondary side of a transformer and includes a PLC modem connected to upper and lower electric power distribution automation terminals through power lines; a power line connected to the PLC modem of each electric power distribution automation terminal to transmit data; and a power distribution management system for remotely controlling the transformer, electric power distribution automation terminals and the devices at the secondary side of the transformer, and storing, calculating and processing data transmitted from the electric power distribution automation terminals.
2. The multi-function electric power distribution automation system according to claim 1, the distribution system can be remotely monitored and controlled using an electric, power distribution automation terminal including a local area wireless data communication means used for local area data communication with an adjacent electric power distribution automation terminal or the power distribution management system when electric power is interrupted or power line communication becomes impossible, and a power supply for operating the local area wireless data communication means.
3. The multi-function electric power distribution automation system according to claim 1 or 2, wherein the power distribution management system comprises: a PC interface including a PLC modem used for power line communication and an RF module used for local area wireless data communication for outputting data received from the electric power distribution automation terminals; and a control PC for receiving the data from the PC interface and generating control signals, storing and calculating the received data.
PCT/KR2004/003397 2003-12-24 2004-12-22 Multi-function electric power supply automation system that use plc modem WO2005064562A1 (en)

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