WO2003071659A1 - Power cut-off system with remote automatic alarm and meter reading service using power line communication network - Google Patents

Power cut-off system with remote automatic alarm and meter reading service using power line communication network Download PDF

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Publication number
WO2003071659A1
WO2003071659A1 PCT/KR2002/001277 KR0201277W WO03071659A1 WO 2003071659 A1 WO2003071659 A1 WO 2003071659A1 KR 0201277 W KR0201277 W KR 0201277W WO 03071659 A1 WO03071659 A1 WO 03071659A1
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WO
WIPO (PCT)
Prior art keywords
power
communication network
accident
electric
line communication
Prior art date
Application number
PCT/KR2002/001277
Other languages
French (fr)
Inventor
Hoy-Shin Park
Original Assignee
Hoy-Shin Park
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 Hoy-Shin Park filed Critical Hoy-Shin Park
Priority to AU2002346334A priority Critical patent/AU2002346334A1/en
Publication of WO2003071659A1 publication Critical patent/WO2003071659A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions
    • H02H3/105—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions responsive to excess current and fault current to earth
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H02H3/044—Checking correct functioning of protective arrangements, e.g. by simulating a fault
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/40—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to ratio of voltage and current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00028—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment involving the use of Internet protocols
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
    • H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses

Definitions

  • the present invention relates to a power cut-off system, and more particularly to a power cut-off system having functions of automatic remote alarm and meter inspection.
  • the power cut-off system of the present invention is able to obtain information with respect to an electric shock, an electric lealcage, gas leakage, a fire and a security accident for the purpose of alarm. Also, it is able to transmit data for power consumption to a remote spot for the purpose of meter inspection. Such can be achieved by making use of a power line communication network.
  • a user should check out the cut-off device in order to confirm whether the cut-off device is normally operated or not.
  • the whole power system should be cut-off even when an electric disorder occurs at an inner part of the system.
  • the whole power system will not be available even though the electric disorder is limited to a certain part of the system.
  • an object of the present invention is to provide a power cut-off system with functions of automatic remote alarm and meter inspection which use power communication network and self-diagnosis function set by an user- in order to maintain prevention of accidental electric disorder in the best condition.
  • Another object of the present invention is to provide a power cut-off system with functions of automatic remote alarm and meter inspection by using power line communication network, which employs high-speed b-type contact point as a relay contact point and provides data for cause of accident by means of memory for electric accident, so that it may minimize victims of the electric accident and damage to property by reducing power cut-off time.
  • Another object of the present invention is to provide a power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network, which provides power of best quality by filtering any of noise, higher harmonics, flicker etc. when one of those is sensed, i.e., when supplying power is not in a good condition.
  • Another object of the present invention is to provide a power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network, which automatically transmits metering signal, measuring signal and alarm signal to corresponding government offices at remote location by means of power line modem.
  • Another obj ect of the present invention is to provide a power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network, which includes a function of alarming of gas leakage, bugler's intrusion etc.
  • a power cut-off system with functions- of automatic remote alarm and meter inspection using ' power line communication network comprising: a plurality of a fist current detecting means for detecting over-current, which is mounted to a main electric line from the outside of the building and to diverging lines diverged from the main electric line; a plurality of a second detecting means for detecting a falling of a thunderbolt to ground, which is mounted to the electric lines; a voltage detecting means for detecting voltage inputted from the main electric line and phase difference of the voltage; an impedance detecting means for detecting impedances of the diverging lines in order to determine whether the restoration of the' diverging lines should be attained; an input signal converter for converting analogue signals inputted from the first and the second current detecting means into programmable signals; a computing process unit for computing the programmable signals converted by the input signal converter, controlling each components and proceeding with self-diagnosis flinction; an auxiliary interrupter
  • Figure 1 is an explanatory view of power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network according to the present invention.
  • Figure 2 is a block diagram representing an input signal fransforming unit and a computing process unit of the power cut-off system shown in Figure 1.
  • Figure 3 shows a network structure constructed by a power line network extending from homes or offices to a service organization wherein the homes or the offices have a power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network according to the present invention.
  • Figure 4 is a flow chart showing a sequence in which a power is cut-off when an electric accident occurs in accordance with a preferred embodiment of the present invention.
  • Figure 5 is a flow chart showing a performance of self-diagnosis in accordance with present invention.
  • Figure 6 is a flow chart in which power is automatically re-applied in accordance with the present invention.
  • a power cut-off system 100 with functions of automatic remote alarm and meter inspection using power line communication network in accordance with a preferred embodiment of the present invention includes, as shown in Figure 1, a main electric line extending from an outside transformer so as to be supplied with power from an outsider, i.e., a power supplier, electric lines extending and diverging from the main electric line to an inside of the building so as to supply the power to an iUimination device in the building, a current detecting CT 100 (converter) mounted on the respective electric lines so as to detect electric cunent flowing through plug receptacle group 1 and group 2, and through diverging lines among electric lines.
  • a main electric line extending from an outside transformer so as to be supplied with power from an outsider, i.e., a power supplier
  • electric lines extending and diverging from the main electric line to an inside of the building so as to supply the power to an iUimination device in the building
  • a current detecting CT 100 (converter) mounted on the respective electric lines so as to
  • diverging lines shown in Figure 1 include three groups only, the numbers of the diverging lines are not limited thereto.
  • a ZCT 103 for detecting current from the electric line to the ground is included in the electric line as shown in the drawing.
  • the ZCT 103 detects current flowing through electric lines located under the ground, on surface of the ground, and inside and outside of buildings.
  • PT 105 is mounted on the main electric line.
  • the detected signals are transformed into programmable digital signals through an input signal transformer 110.
  • the input signal transformer 110 includes an amplifier 111 for amplifying the detected signals and a filter 113 for filtering noise affecting the amplified signal.
  • the amplifier 111 and the filter 113 are connected with the CT 101, ZCT 103, and PT 105 byway of signal fransmitting line.
  • the input signal transformer 110 includes a multiplexor 115 for multiplexing an analogue signal that has been amplified and filtered.
  • a line detector 107 for detecting impedance in the electric line is input-connected to the multiplexor 115 in order to sense whether the restoration of the electric lines is achieved after the electric accident.
  • the line detector 107 is also connected to the multiplexor 115 via the amplifier 111 and the filter 113.
  • the multiplexer 115 is connected to a S/H 117 (sample/holder) in order to hold and sample the input analogue signal in an instant.
  • the S H 117 is connected to an A D transformer 119 in ordef to transform the sampling analogue values to the digital values that may be processed by a software program in accordance with the present invention.
  • the S/H 117 and A D transformer 119 are components of the input signal transformer 110.
  • the transformed digital value is computed by a computing process unit 120 including CPU
  • the computing process unit 120 includes the CPU 121, a ROM 125 including software program and reference value with respect to input currents and voltages, a RAM 123 for data-basing the input digital data and computing the input digital data with respect to the reference data set by the program, and a RTC 127 (real time clock) for setting time in order to perform ftmctions of self diagnosis and time-memorization at the time of the electric accident.
  • a ROM 125 including software program and reference value with respect to input currents and voltages
  • RAM 123 for data-basing the input digital data and computing the input digital data with respect to the reference data set by the program
  • RTC 127 real time clock
  • the RAM is constructed by combining a flash memory, which maintains data even when the power rums off, with a static memory.
  • the computing process unit 120 includes an auxiliary power 129, such as a backup battery in order to prevent an important operation of an alarm system 100 from stopping and to prevent the stored data from being lost when the main power supply is not available on account of a certain cause.
  • auxiliary power 129 such as a backup battery
  • the power cut-off system 100 of the present invention includes a plurality of interrupters 140, 141 so that the whole power lines are not allowed to be interrupted at the same time by interrupting the power supply to the electric line in a ' state of the electric accident and by letting the power being supplied to the electric line in a normal state when the electric accident is sensed by comparing the input value into the input computing process unit 120 to the reference value.
  • the interrupter 140, 141 is quickly restored in an automatic manner.
  • the main interrupter 140 is provided for interrupting the power of the main electric line extending from the outside of the building to the inside thereof
  • the main'interrupter 140 is mounted to automatically and manually inteixupt all powers in the building both in automatic and manual manners only when it is needed to cut-off the entire powers in the building as a result of computation by the computing process unit 120.
  • the auxiliary inte ⁇ upter 141 is so mounted to each of the diverging lines extending from the main interrupter 140 that the interruption of the power supply is restricted to a certain zone and that the restoration of the power supply will be more quickly achieved.
  • Such auxiliary interrupter 141 makes it possible to interrupt and restore the electric lines in the state of the electric accident according to the computation of the computing process unit 120. Therefore, a disadvantage in that whole indoor power system should be inteirupted can be overcome.
  • the main interrupter 140 and the auxiliary interrupter 141 are constructed to quickly operate by an interrupter driver 145 which is controlled by the program installed in the computing process unit 120.
  • an electro-mechanical interrupter 143 is also included.
  • the power cut-off system with the function of automatic remote alarm using the power communication network includes a power filtering means for removing noises in order to prevent deterioration of the power due to higher harmonics, noise and flickers.
  • the power cut-off system with the functions of automatic remote alarm and meter inspection using the power communication network includes a display means 133 in order to enable a user to recognize the operation of the system with naked eyes.
  • the display means 133 includes one of an LCD, an LED, a lamp and a composite thereof.
  • the power cut-off system 100 of the present invention includes a RS-232 serial port 153 for interfacing an external controller, such as a personal computer so as to control the system.
  • the power cut-off system 100 of the present invention includes a power line cornmunication modem 150 in order to transmit an alarm signal via power line internet communication network to an emergency station as well as men dwelling in the building when the electric accident occurs.
  • the alarm signal includes information data stored in the RAM 123 by means of the installed software program.
  • the power line communication modem 150 of the power cut-off system 100 is connected to the power line in the building and connected to the internet server via the internet backbone performing the power line communication function.
  • the power cut-off system 100 is connected to the internet server installed at a fire station or the power service station, so that it is possible to be informed through the automatic alarm function and take measures, such as rescue of a person and extinguishments of fire when the electric shock and the fire due to the electricity occur.
  • An interface part of the power cut-off system of the present invention is shown with a dotted line in Figure 1.
  • the interface part serves to send gauge examination record for power consumption to the power service station by a remote meter inspection method in order to perform a function of wattmeter.
  • the power cut-off system 100 may include various kinds of interface devices 155 and the detecting means for detecting the fire, the ' gas leakage, the prevention of the bugler's intrusion.
  • the detecting means for detecting the fire, the gas leakage and the prevention of the bugler's intrusion is connected to the computing process unit 120 or to the external device through an RS-232 serial port. Further, the buzzer 130 is included in order to give the alarm to the dwellers in the building when the accident info ⁇ nation is detected.
  • the power cut-off system 100 of the present invention is connected to' the internet server located at the power service station, the gas service station, the fire station, and the police station through the power line and the internet backbone performing the power line communication function.
  • the electric shock, the falling of a thunderbolt to the ground, and the over-current may be sensed by analyzing the current signal which is inputted through the CT 101, the ZCT 103, and etc.
  • the CT 101, the ZCT 103, etc.. are installed at the main electric line and the diverging lines. If the electric accident is sensed, it should be determined whether it is the electric shock to the man. In case of the electric shock to the man, the power supply to the electric line involved in the electric shock should be interrupted by the b-type contact point of the auxiliary interrupter 141, so that the power is not supplied to the corresponding electric line.
  • the power is immediately interrupted through the b-type contact point of the auxiliary interrupter 141 by the control action of the software program in the computing process unit 120. Afterward, if it is found that the electric shock is settled, the power is immediately supplied according to a power supplying sequence as described herein below.
  • the electric accident is not the electric shock, it should be determined whether the electric accident is due to the over-current or not. If the accident is due to the over-current, similar to the electric shock case, the power supply to the electric line involved in the over-current will be interrupted by the auxiliary interrupter 141 in the type of b-type contact point by the control action of the computing process unit 120, so that the power is not supplied to the corresponding electric line.
  • the power is immediately supplied according to the power supplying sequence.
  • the power supply to the entire lines will be immediately interrupted in order to protect against risks of the human life loss and the fire. If the electric accident is not either the electric shock or the over-current, the entire power is intemipted, the alarm sound is given to the user and the alarm message will be displayed on the display means 133.
  • the content relating to the accident and the alarm information will be transmitted to the service serve through the power line communication network so as to settle the accident.
  • FIG. 5 a sequence for performing self-diagnosis is shown. The self-diagnosis is performed in order to maintain an optimum operation of the power cut-off system 100.
  • 121 starts the self-diagnosis operation whenever the time set by a time counter 127 (RTC) included in the computing process unit 120 is up.
  • the time set by the time counter 127 is programmed by the user and is not limited an hour, a day and a welt.
  • a signal for the self-diagnosis is generated.
  • a system error for each of the components is examined, an error of a power unit for supplying the power to the system is examined and an alarm enor for each buzzer 130 and etc is examined.
  • the buzzer 130 immediately gives the alarm sound. Also, the display means 133 displays which of the system, the power unit, the buzzer has the error.
  • the communication error is examined by confirming whether the connection to the service server is properly attained. If the connection to the service server is not properly attained through the internet communication network, the ercor is represented by the alarm sound or the display means 133.
  • Figure 6 shows a sequence in which the power is automatically re-supplied after the electric accident. When the accident occurs, the interrupter interrupts one of the electric lines.
  • the line detector 107 which is connected to the corresponding electric line, provides the computing process unit 120 with the impedance information related to that electric line.
  • the diverging lines are intemipted by the b-type contact point of the auxiliary interrupter 141.
  • the impedance detected by the line detector 107 approaches to the impedance of the certain falling, it is detennined that the falling of the munderbolt to the ground or the electric accident has occurred.
  • the impedance value varies gradually, or it approaches to a value corcesponding to the electric short, or it deviates greatly from a value conesponding to the falling of the thunderbolt to the ground, it is determined that the over-current has occurred.
  • the filtering operation is provided as an additional function.
  • the CT 101, the PT 105 and etc. can detect the deterioration of the power due to the higher harmonics, the noise and flicker.
  • the filtering means 151 may remove the higher harmonics, the noise, and the flicker so that the power is maintained in the best condition.
  • the power cut-off system with the function of automatic remote alarm of the present invention may fransmit the information related to the accident to the server ofthe service centers through the power line modem 150 and the when the accident occurs.
  • the informationjrelated toJhe accident is stored in the RAM as the data for the accident
  • the data stored in the RAM is processed into a packet data including the alarm signal.
  • the packet data is transmitted to the service center in order to alarm the service center and manage the accident. Further, the service center may recognize the content ofthe accident through the packet data.
  • the power cut-off system with functions of automatic alarm and meter inspection of the present invention may be maintained in the best condition by means ofthe self-diagnosis function which is operated on a daily basis or a monthly basis depending on the user's setting.
  • the power interruption is limited only to the electric line involved in the accident and not to the whole electric lines.
  • the power is able to be immediately interrupted so that the electric shock to the human lifer and the damage to the property may be minimized.
  • the data by which the cause ofthe accident, such as the fire or, the electric shock can be analyzed is provided by means ofthe memory function at the time ofthe accident.
  • the alarm information related to the accident, the metering record and the record related to the security, the fire and the gas leakage may be transmitted to the server of the service station through the power line communication network.
  • the power may be maintained in the best condition and the deterioration ofthe power may be prevented by the power filtering means.

Abstract

This invention relates to distribution line interrupting system having a remote auto alarm and a meter inspection function using communication network. This system comprise first and second current detectors for detecting the groundfault overcurrent, voltage detector, impedance detector, control unit and circuit breakers. The present system breaks only the line which has problems such as groundfault overcurrent and restore the line after the problems are solved.

Description

POWER CUT-OFF SYSTEM WITH REMOTE AUTOMATIC ALARM AND METER READING SERVICE USING POWER LINE COMMUNICATION NETWORK
BACKGROUND OF THE INVENTION
Field of the invention
The present invention relates to a power cut-off system, and more particularly to a power cut-off system having functions of automatic remote alarm and meter inspection. The power cut-off system of the present invention is able to obtain information with respect to an electric shock, an electric lealcage, gas leakage, a fire and a security accident for the purpose of alarm. Also, it is able to transmit data for power consumption to a remote spot for the purpose of meter inspection. Such can be achieved by making use of a power line communication network.
Description of the Prior Art A conventional cut-off system currently used at home and office, which is intended for
•.prevention of over-current and for protection against falling of a thunderbolt to the ground, was developed by combining electronics with mechanics. Such conventional cut-off system lacks most pieferable stability that is requisite at present, so that an accident from an electric shock due to a current leakage, damage to an electric appliance due to an over-current and a fire accident due to an electiicity occur frequently. As a result, a number of man may become a victim of such accidents.
In this type of the cut-off device, it is often too late to cut-off the power when a man is struck by electricity. Thus, it is not possible to protect the man against an accident due to the electric shock.
Also, a user should check out the cut-off device in order to confirm whether the cut-off device is normally operated or not. Also, the whole power system should be cut-off even when an electric disorder occurs at an inner part of the system. Thus, there is a disadvantage in that the whole power system will not be available even though the electric disorder is limited to a certain part of the system.
Also, because there is not provided with any means for alarming of the electric accident and for analyzing cause of the electric accident, it is difficult to find out what causes the electric accident. SUMMARY OF THE TNVENπON
Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a power cut-off system with functions of automatic remote alarm and meter inspection which use power communication network and self-diagnosis function set by an user- in order to maintain prevention of accidental electric disorder in the best condition.
Another object of the present invention is to provide a power cut-off system with functions of automatic remote alarm and meter inspection by using power line communication network, which employs high-speed b-type contact point as a relay contact point and provides data for cause of accident by means of memory for electric accident, so that it may minimize victims of the electric accident and damage to property by reducing power cut-off time.
Another object of the present invention is to provide a power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network, which provides power of best quality by filtering any of noise, higher harmonics, flicker etc. when one of those is sensed, i.e., when supplying power is not in a good condition.
Another object of the present invention is to provide a power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network, which automatically transmits metering signal, measuring signal and alarm signal to corresponding government offices at remote location by means of power line modem. Another obj ect of the present invention is to provide a power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network, which includes a function of alarming of gas leakage, bugler's intrusion etc.
In order to accomplish this object, there is provided a power cut-off system with functions- of automatic remote alarm and meter inspection using 'power line communication network, the system comprising: a plurality of a fist current detecting means for detecting over-current, which is mounted to a main electric line from the outside of the building and to diverging lines diverged from the main electric line; a plurality of a second detecting means for detecting a falling of a thunderbolt to ground, which is mounted to the electric lines; a voltage detecting means for detecting voltage inputted from the main electric line and phase difference of the voltage; an impedance detecting means for detecting impedances of the diverging lines in order to determine whether the restoration of the' diverging lines should be attained; an input signal converter for converting analogue signals inputted from the first and the second current detecting means into programmable signals; a computing process unit for computing the programmable signals converted by the input signal converter, controlling each components and proceeding with self-diagnosis flinction; an auxiliary interrupter mounted to the diverging lines, which is controlled by the computing result from the computing process unit, interrupts the electric lines involved in the accident when the accident such as an electric shock or an over-current is sensed, and restoring the electric lines after the treatment of the accident, and a main interrupter which is mounted to the main electric line and interrupts the whole power system both in automatic and manual manners when the auxiliary interrupter fails to interrupt the electric line involved in the accident; a modem connected to a power line communication network, which transmits power consumption record obtained by remote meter inspection, and converts alarm signals including accident-related data obtained from the time before the accident to the time after the accident to signals capable of rransmitting through the communication network and transmits those signals when the accident occurs. BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:
Figure 1 is an explanatory view of power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network according to the present invention.
Figure 2 is a block diagram representing an input signal fransforming unit and a computing process unit of the power cut-off system shown in Figure 1.
Figure 3 shows a network structure constructed by a power line network extending from homes or offices to a service organization wherein the homes or the offices have a power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network according to the present invention. Figure 4 is a flow chart showing a sequence in which a power is cut-off when an electric accident occurs in accordance with a preferred embodiment of the present invention.
Figure 5 is a flow chart showing a performance of self-diagnosis in accordance with present invention.
Figure 6 is a flow chart in which power is automatically re-applied in accordance with the present invention.
DETAILED DESCRIPπON OF THE PREFERRED EMBODIMENTS
Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the following description and drawings, the same reference numerals are used to designate the same or similar components, and so repetition of the description on the same or similar components will be omitted.
A power cut-off system 100 with functions of automatic remote alarm and meter inspection using power line communication network in accordance with a preferred embodiment of the present invention includes, as shown in Figure 1, a main electric line extending from an outside transformer so as to be supplied with power from an outsider, i.e., a power supplier, electric lines extending and diverging from the main electric line to an inside of the building so as to supply the power to an iUimination device in the building, a current detecting CT 100 (converter) mounted on the respective electric lines so as to detect electric cunent flowing through plug receptacle group 1 and group 2, and through diverging lines among electric lines.
Even though diverging lines shown in Figure 1 include three groups only, the numbers of the diverging lines are not limited thereto.
A ZCT 103 for detecting current from the electric line to the ground is included in the electric line as shown in the drawing. The ZCT 103 detects current flowing through electric lines located under the ground, on surface of the ground, and inside and outside of buildings.
In order to detect input voltage of the main electric line and voltage phage difference, PT 105 is mounted on the main electric line.
In order to detect abnormality of the power in each of the electric lines and the electric accident, such as an electric shock, current leakage and overload by inputting signals detected form the CT 101, the ZCT 103 and the PT 105, the detected signals are transformed into programmable digital signals through an input signal transformer 110. As shown in Figure 2, the input signal transformer 110 includes an amplifier 111 for amplifying the detected signals and a filter 113 for filtering noise affecting the amplified signal. The amplifier 111 and the filter 113 are connected with the CT 101, ZCT 103, and PT 105 byway of signal fransmitting line. The input signal transformer 110 includes a multiplexor 115 for multiplexing an analogue signal that has been amplified and filtered.
In accordance with one aspect of the present invention, beside the input-connection from the ZCT 103, the CT 101 and the PT 105 to the multiplexor 115, a line detector 107 for detecting impedance in the electric line is input-connected to the multiplexor 115 in order to sense whether the restoration of the electric lines is achieved after the electric accident.
The line detector 107 is also connected to the multiplexor 115 via the amplifier 111 and the filter 113.
The multiplexer 115 is connected to a S/H 117 (sample/holder) in order to hold and sample the input analogue signal in an instant. The S H 117 is connected to an A D transformer 119 in ordef to transform the sampling analogue values to the digital values that may be processed by a software program in accordance with the present invention.
As shown in Figures 1 and 2, the S/H 117 and A D transformer 119 are components of the input signal transformer 110. The transformed digital value is computed by a computing process unit 120 including CPU
121. The computing process unit 120 includes the CPU 121, a ROM 125 including software program and reference value with respect to input currents and voltages, a RAM 123 for data-basing the input digital data and computing the input digital data with respect to the reference data set by the program, and a RTC 127 (real time clock) for setting time in order to perform ftmctions of self diagnosis and time-memorization at the time of the electric accident.
The RAM is constructed by combining a flash memory, which maintains data even when the power rums off, with a static memory.
The computing process unit 120 includes an auxiliary power 129, such as a backup battery in order to prevent an important operation of an alarm system 100 from stopping and to prevent the stored data from being lost when the main power supply is not available on account of a certain cause.
The power cut-off system 100 of the present invention includes a plurality of interrupters 140, 141 so that the whole power lines are not allowed to be interrupted at the same time by interrupting the power supply to the electric line in a 'state of the electric accident and by letting the power being supplied to the electric line in a normal state when the electric accident is sensed by comparing the input value into the input computing process unit 120 to the reference value. When it is sensed by detecting the impedance of the electric lines after the electric accident that the electric accident is settled, the interrupter 140, 141 is quickly restored in an automatic manner.
The main interrupter 140 is provided for interrupting the power of the main electric line extending from the outside of the building to the inside thereof The main'interrupter 140 is mounted to automatically and manually inteixupt all powers in the building both in automatic and manual manners only when it is needed to cut-off the entire powers in the building as a result of computation by the computing process unit 120.
The auxiliary inteπupter 141 is so mounted to each of the diverging lines extending from the main interrupter 140 that the interruption of the power supply is restricted to a certain zone and that the restoration of the power supply will be more quickly achieved. Such auxiliary interrupter 141 makes it possible to interrupt and restore the electric lines in the state of the electric accident according to the computation of the computing process unit 120. Therefore, a disadvantage in that whole indoor power system should be inteirupted can be overcome. " The main interrupter 140 and the auxiliary interrupter 141 are constructed to quickly operate by an interrupter driver 145 which is controlled by the program installed in the computing process unit 120. However, in order to interrupt the power supply either in electronic or mechanical manner regardless of the CPU 121 at the computing process unit 120, when the self-diagnosis function finds out that the programmed control does not work properly, an electro-mechanical interrupter 143 is also included. Also, the power cut-off system with the function of automatic remote alarm using the power communication network includes a power filtering means for removing noises in order to prevent deterioration of the power due to higher harmonics, noise and flickers.
Also, the power cut-off system with the functions of automatic remote alarm and meter inspection using the power communication network includes a display means 133 in order to enable a user to recognize the operation of the system with naked eyes. The display means 133 includes one of an LCD, an LED, a lamp and a composite thereof.
Also, keys 131 for enabling the user to set the power cut-off system 100 of the present invention and an alarm buzzer for alarming the user the electric accidents are included. In addition to the control action performed by the computing process unit 120, the power cut-off system 100 of the present invention includes a RS-232 serial port 153 for interfacing an external controller, such as a personal computer so as to control the system.
The power cut-off system 100 of the present invention includes a power line cornmunication modem 150 in order to transmit an alarm signal via power line internet communication network to an emergency station as well as men dwelling in the building when the electric accident occurs.
Here, the alarm signal includes information data stored in the RAM 123 by means of the installed software program.
In other words, as shown in Figure 3, the power line communication modem 150 of the power cut-off system 100 is connected to the power line in the building and connected to the internet server via the internet backbone performing the power line communication function.
In other words, the power cut-off system 100 is connected to the internet server installed at a fire station or the power service station, so that it is possible to be informed through the automatic alarm function and take measures, such as rescue of a person and extinguishments of fire when the electric shock and the fire due to the electricity occur. An interface part of the power cut-off system of the present invention is shown with a dotted line in Figure 1. The interface part serves to send gauge examination record for power consumption to the power service station by a remote meter inspection method in order to perform a function of wattmeter. Also, the power cut-off system 100 may include various kinds of interface devices 155 and the detecting means for detecting the fire, the' gas leakage, the prevention of the bugler's intrusion.
More specifically, the detecting means for detecting the fire, the gas leakage and the prevention of the bugler's intrusion is connected to the computing process unit 120 or to the external device through an RS-232 serial port. Further, the buzzer 130 is included in order to give the alarm to the dwellers in the building when the accident infoπnation is detected. As shown in Figure 3, the power cut-off system 100 of the present invention is connected to' the internet server located at the power service station, the gas service station, the fire station, and the police station through the power line and the internet backbone performing the power line communication function.
Herein below, the operation and the effect of the present invention will be described. Referring to Figure 4 in which a sequence for interrupting the power at the time of the electtic shock and the over-current is shown, the electric shock, the falling of a thunderbolt to the ground, and the over-current may be sensed by analyzing the current signal which is inputted through the CT 101, the ZCT 103, and etc. The CT 101, the ZCT 103, etc.. are installed at the main electric line and the diverging lines. If the electric accident is sensed, it should be determined whether it is the electric shock to the man. In case of the electric shock to the man, the power supply to the electric line involved in the electric shock should be interrupted by the b-type contact point of the auxiliary interrupter 141, so that the power is not supplied to the corresponding electric line.
At this time, the power is immediately interrupted through the b-type contact point of the auxiliary interrupter 141 by the control action of the software program in the computing process unit 120. Afterward, if it is found that the electric shock is settled, the power is immediately supplied according to a power supplying sequence as described herein below.
In case that the electric shock is not settled even by the interruption of the electric line in the state of the accident, the entire power system is interrupted in order to mirώnize the damage due to the electric shock.
If the electric accident is not the electric shock, it should be determined whether the electric accident is due to the over-current or not. If the accident is due to the over-current, similar to the electric shock case, the power supply to the electric line involved in the over-current will be interrupted by the auxiliary interrupter 141 in the type of b-type contact point by the control action of the computing process unit 120, so that the power is not supplied to the corresponding electric line.
Afterward, if it is found that the over-current is settled, the power is immediately supplied according to the power supplying sequence.
Otherwise, the power supply to the entire lines will be immediately interrupted in order to protect against risks of the human life loss and the fire. If the electric accident is not either the electric shock or the over-current, the entire power is intemipted, the alarm sound is given to the user and the alarm message will be displayed on the display means 133.
Also, the content relating to the accident and the alarm information will be transmitted to the service serve through the power line communication network so as to settle the accident. Referring to Figure 5, a sequence for performing self-diagnosis is shown. The self-diagnosis is performed in order to maintain an optimum operation of the power cut-off system 100. The CPU
121 starts the self-diagnosis operation whenever the time set by a time counter 127 (RTC) included in the computing process unit 120 is up. The time set by the time counter 127 is programmed by the user and is not limited an hour, a day and a welt. A signal for the self-diagnosis is generated. Next, a system error for each of the components is examined, an error of a power unit for supplying the power to the system is examined and an alarm enor for each buzzer 130 and etc is examined.
Here, if the enor is sensed from any of the components, the buzzer 130 immediately gives the alarm sound. Also, the display means 133 displays which of the system, the power unit, the buzzer has the error.
Finally, the communication error is examined by confirming whether the connection to the service server is properly attained. If the connection to the service server is not properly attained through the internet communication network, the ercor is represented by the alarm sound or the display means 133. Figure 6 shows a sequence in which the power is automatically re-supplied after the electric accident. When the accident occurs, the interrupter interrupts one of the electric lines. The line detector 107, which is connected to the corresponding electric line, provides the computing process unit 120 with the impedance information related to that electric line.
When the falling of the thunderbolt to the ground is detected at the ZCT 103, the diverging lines are intemipted by the b-type contact point of the auxiliary interrupter 141. Afterward, the impedance detected by the line detector 107 approaches to the impedance of the certain falling, it is detennined that the falling of the munderbolt to the ground or the electric accident has occurred. In case that the impedance value varies gradually, or it approaches to a value corcesponding to the electric short, or it deviates greatly from a value conesponding to the falling of the thunderbolt to the ground, it is determined that the over-current has occurred.
If the impedance of the electric lines detected by the line detector 107 is infinite, it is determitied that the electric line is severed.
When such accidents as the over-current, the electtic shock, and the severance of the electric lines are sensed, the alarm is given and the information related to the accident is transmit through the power line communication network. However, if the impedance is in a normal state but the electric power is interrupted due the accident, the power is immediately re-supplied by the control action ofthe computing process 120.
The filtering operation is provided as an additional function. The CT 101, the PT 105 and etc. can detect the deterioration of the power due to the higher harmonics, the noise and flicker. When the deterioration ofthe power, which is detected by the CT 101, the PT 105 and etc, is sensed at the computing process unit 120 as a wave pattern in the current and the voltage, the filtering means 151 may remove the higher harmonics, the noise, and the flicker so that the power is maintained in the best condition.
The power cut-off system with the function of automatic remote alarm of the present invention may fransmit the information related to the accident to the server ofthe service centers through the power line modem 150 and the when the accident occurs.
The informationjrelated toJhe accident is stored in the RAM as the data for the accident The data stored in the RAM is processed into a packet data including the alarm signal. The packet data is transmitted to the service center in order to alarm the service center and manage the accident. Further, the service center may recognize the content ofthe accident through the packet data.
The advantages ofthe present invention will be listed herein below:
The power cut-off system with functions of automatic alarm and meter inspection of the present invention may be maintained in the best condition by means ofthe self-diagnosis function which is operated on a daily basis or a monthly basis depending on the user's setting. When the electric accident occurs, the power interruption is limited only to the electric line involved in the accident and not to the whole electric lines. Also, by employing the b-type contact point of the auxiliary interrupter, the power is able to be immediately interrupted so that the electric shock to the human lifer and the damage to the property may be minimized.
The data by which the cause ofthe accident, such as the fire or, the electric shock can be analyzed is provided by means ofthe memory function at the time ofthe accident. The alarm information related to the accident, the metering record and the record related to the security, the fire and the gas leakage may be transmitted to the server of the service station through the power line communication network.
The power may be maintained in the best condition and the deterioration ofthe power may be prevented by the power filtering means.
Although a preferred embodiment ofthe present invention has been described for illustrative piuposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without dφartrng from the scope and spirit ofthe invention as disclosed in the accompanying claims.

Claims

WHAT IS CLAIMED IS:
1. A power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network, the system comprising: a plurality of a fist current detecting means for detecting over-current, which is mounted to a main electric line from the outside ofthe building and to diverging lines diverged from the main electric line; a plurality of a second detecting means for detecting a falling of a thunderbolt to ground, which is mounted to the electric lines; a voltage detecting means for detecting voltage inputted from the main electric line and phase difference ofthe voltage; an-impedance-detecting means for detecting impedances of the dvergmgjines n order to deteirnine whether the restoration ofthe diverging lines should be attained; an input signal converter for converting analogue signals inputted from the first and the second current detecting means into programmable signals; a computing process unit for computing the programmable signals converted by the input signal converter, controlling each components and proceeding with self-diagnosis function; an auxiliary interrupter mounted to the diverging lines, which is controlled by the computing result from the computing process unit, interrupts the electric lines involved in the accident when the accident such as an electric shock or an over-current is sensed, and restoring the electric lines after the treatment ofthe accident, and a main interrupter which is mounted to the main electric line and inteiτupts the whole power system both in automatic and manual manners when the auxiliary inteiTiipter fails to interrupt the electric line involved in the accident; a modem connected to a power line communication network, which transmits power consmnption record obtained by remote meter inspection, and converts alarm signals including accident-related data obtained from the time before the accident to the time after the accident to signals capable of fransmitting through the communication network and transmits those signals when the accident occurs.
2. A power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network as claimed in claim 1 , wherein the first detecting means is a CT.
3. A power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network as claimed in claim 1, wherein the second detecting means is a ZCT.
4. A power cut-off system with ftmctions of automatic remote alarm and meter inspection using power line communication network as claimed in claim 1, wherein the input signal converter comprises: a filter for removing noises included in amplified signals; a MUX for switching analogue signals from which the noises have been removed; a S/H for catching and sampling the switched analogue signals; an A/D converter for converting the sampled analogue signal into digital signals.
5. A power cut-off system with ftmctions of automatic remote alarm and meter inspection using power line communication network as claimed in claim 1 , wherein the computing process unit comprises: a first memory means including software program and reference value with respect to value of input signal; a second memory means for data-basing the input signal and comparing the reference value 1277
to the input signal; a time counter for confrolling execution time in order to carry out data-basing ofthe accident time record and the self-diagnosis; a CPU for confrolling the components.
A power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network as claimed in claim 1 or 4, wherein the computing process unit comprises an auxiliary power in order to preserve the memorized data when the main power is cut-off.
7. A power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network as claimed in claim 1 , wherein the main intermpter comprises an a-type contact point, and automatic and manual type contact point, and the auxiliary intermpter comprises a b-type contact point. . A power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network as claimed in claim 1, wherein it further comprises a filtering means for filtering power-deteriorating elements, such as higher haπnonics, noises and etc, if any. . A power cut-off system with functions of automatic remote alarm and meter inspection using power line communication network as claimed in claim 1, wherein it further comprises an electro-mechanical inteπupter in order to mechanically intemipt the main power when tliere happens a problem in the software during the execution ofthe self-diagnosis.
PCT/KR2002/001277 2002-02-20 2002-07-05 Power cut-off system with remote automatic alarm and meter reading service using power line communication network WO2003071659A1 (en)

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