FR2391585A1 - Procede de transmission de signaux sur des lignes d'un reseau de distribution de courant alternatif - Google Patents

Procede de transmission de signaux sur des lignes d'un reseau de distribution de courant alternatif

Info

Publication number
FR2391585A1
FR2391585A1 FR7814020A FR7814020A FR2391585A1 FR 2391585 A1 FR2391585 A1 FR 2391585A1 FR 7814020 A FR7814020 A FR 7814020A FR 7814020 A FR7814020 A FR 7814020A FR 2391585 A1 FR2391585 A1 FR 2391585A1
Authority
FR
France
Prior art keywords
network
transmission
lines
signals
distribution network
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
FR7814020A
Other languages
English (en)
French (fr)
Other versions
FR2391585B1 (US06534493-20030318-C00342.png
Inventor
Jean-Gabriel Gander
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Landis and Gyr AG
Original Assignee
Landis and Gyr AG
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 Landis and Gyr AG filed Critical Landis and Gyr AG
Publication of FR2391585A1 publication Critical patent/FR2391585A1/fr
Application granted granted Critical
Publication of FR2391585B1 publication Critical patent/FR2391585B1/fr
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B3/00Line transmission systems
    • H04B3/54Systems for transmission via power distribution lines
    • H04B3/542Systems for transmission via power distribution lines the information being in digital form
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit 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
    • H02J13/00006Circuit 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
    • H02J13/00007Circuit 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 the power network as support for the transmission
    • H02J13/00009Circuit 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 the power network as support for the transmission using pulsed signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B2203/00Indexing scheme relating to line transmission systems
    • H04B2203/54Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5404Methods of transmitting or receiving signals via power distribution lines
    • H04B2203/5416Methods of transmitting or receiving signals via power distribution lines by adding signals to the wave form of the power source
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B2203/00Indexing scheme relating to line transmission systems
    • H04B2203/54Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5404Methods of transmitting or receiving signals via power distribution lines
    • H04B2203/5425Methods of transmitting or receiving signals via power distribution lines improving S/N by matching impedance, noise reduction, gain control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B2203/00Indexing scheme relating to line transmission systems
    • H04B2203/54Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429Applications for powerline communications
    • H04B2203/545Audio/video application, e.g. interphone
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B2203/00Indexing scheme relating to line transmission systems
    • H04B2203/54Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462Systems for power line communications
    • H04B2203/5483Systems for power line communications using coupling circuits
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B2203/00Indexing scheme relating to line transmission systems
    • H04B2203/54Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462Systems for power line communications
    • H04B2203/5491Systems for power line communications using filtering and bypassing
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S40/00Systems 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
    • Y04S40/12Systems 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
    • Y04S40/121Systems 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 the power network as support for the transmission

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Selective Calling Equipment (AREA)
  • Noise Elimination (AREA)
FR7814020A 1977-05-17 1978-05-11 Procede de transmission de signaux sur des lignes d'un reseau de distribution de courant alternatif Granted FR2391585A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH612577A CH604409A5 (US06534493-20030318-C00342.png) 1977-05-17 1977-05-17

Publications (2)

Publication Number Publication Date
FR2391585A1 true FR2391585A1 (fr) 1978-12-15
FR2391585B1 FR2391585B1 (US06534493-20030318-C00342.png) 1984-04-27

Family

ID=4304672

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7814020A Granted FR2391585A1 (fr) 1977-05-17 1978-05-11 Procede de transmission de signaux sur des lignes d'un reseau de distribution de courant alternatif

Country Status (7)

Country Link
US (1) US4307380A (US06534493-20030318-C00342.png)
JP (2) JPS53142114A (US06534493-20030318-C00342.png)
CH (1) CH604409A5 (US06534493-20030318-C00342.png)
DE (1) DE2727263B2 (US06534493-20030318-C00342.png)
FR (1) FR2391585A1 (US06534493-20030318-C00342.png)
GB (1) GB1604136A (US06534493-20030318-C00342.png)
NL (1) NL7805255A (US06534493-20030318-C00342.png)

Families Citing this family (53)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4349896A (en) * 1980-11-26 1982-09-14 Halliburton Company Digital acoustic logging method and apparatus
US4468792A (en) * 1981-09-14 1984-08-28 General Electric Company Method and apparatus for data transmission using chirped frequency-shift-keying modulation
EP0084098B1 (de) * 1982-01-18 1985-03-20 LGZ LANDIS & GYR ZUG AG Empfänger für Tonfrequenz-Signale
EP0085753A1 (de) * 1982-02-05 1983-08-17 LGZ LANDIS & GYR ZUG AG System zur Übertragung digitaler Signalimpulse über Leitungen eines Wechselstrom-Verteilungsnetzes
JPS59148435A (ja) * 1983-02-15 1984-08-25 Matsushita Electric Works Ltd 電力線搬送システム
US4641322A (en) * 1983-10-18 1987-02-03 Nec Corporation System for carrying out spread spectrum communication through an electric power line
JPS6116632A (ja) * 1984-07-03 1986-01-24 Nec Corp 電力線通信方式
JPS6086935A (ja) * 1983-10-18 1985-05-16 Nec Corp スペクトラム拡散電力線通信方式
JPS6116633A (ja) * 1984-07-03 1986-01-24 Nec Corp 電力線通信方式及び送受信装置
FR2577733B1 (fr) * 1985-02-14 1988-03-25 Enertec Procede et systeme de transmission en bande etalee, notamment pour la transmission d'informations sur un reseau de distribution d'energie electrique
DE3515127A1 (de) * 1985-04-26 1986-10-30 Rafi Gmbh & Co Elektrotechnische Spezialfabrik, 7981 Berg Netzgebundene vielfachzugriffseinrichtung
DE3515663A1 (de) * 1985-05-02 1986-11-06 Rafi Gmbh & Co Elektrotechnische Spezialfabrik, 7981 Berg Verfahren zur uebertragung von information ueber elektrische energieversorgungsnetze
JPS6214533A (ja) * 1985-07-11 1987-01-23 Nishimu Denshi Kogyo Kk 配電線を伝送路とする信号伝送方法
EP0211567A3 (en) * 1985-07-24 1989-05-24 Nec Home Electronics, Ltd. Spread spectrum power line communications
US4815106A (en) * 1986-04-16 1989-03-21 Adaptive Networks, Inc. Power line communication apparatus
US4852169A (en) * 1986-12-16 1989-07-25 GTE Laboratories, Incorporation Method for enhancing the quality of coded speech
WO1990015394A1 (en) 1989-06-02 1990-12-13 Aisi Research Corporation Appliance interface for exchanging data
US5090024A (en) * 1989-08-23 1992-02-18 Intellon Corporation Spread spectrum communications system for networks
US5319634A (en) * 1991-10-07 1994-06-07 Phoenix Corporation Multiple access telephone extension systems and methods
EP0748480A1 (en) * 1992-06-30 1996-12-18 Electronic Innovators, Inc. Distributed intelligence engineering casualty and damage control management system using an ac power line carrier-current lan
JPH07509592A (ja) * 1992-07-31 1995-10-19 インテロン コーポレーション Rfネットワーク通信に適したスペクトラム拡散通信システム
US5530737A (en) * 1993-03-22 1996-06-25 Phonex Corporation Secure access telephone extension system and method
US5818821A (en) * 1994-12-30 1998-10-06 Intelogis, Inc. Universal lan power line carrier repeater system and method
CA2154298C (en) * 1995-07-20 2002-06-18 Robert S. Hannebauer Spread spectrum data communicator
US5777544A (en) * 1997-03-17 1998-07-07 Intellon Corporation Apparatus and method for controlling data communications having combination of wide and narrow band frequency protocols
US5970127A (en) * 1997-10-16 1999-10-19 Phonex Corporation Caller identification system for wireless phone jacks and wireless modem jacks
US6055435A (en) * 1997-10-16 2000-04-25 Phonex Corporation Wireless telephone connection surge suppressor
US6107912A (en) * 1997-12-08 2000-08-22 Phonex Corporation Wireless modem jack
US6480510B1 (en) 1998-07-28 2002-11-12 Serconet Ltd. Local area network of serial intelligent cells
US6246868B1 (en) 1998-08-14 2001-06-12 Phonex Corporation Conversion and distribution of incoming wireless telephone signals using the power line
US6243571B1 (en) 1998-09-21 2001-06-05 Phonex Corporation Method and system for distribution of wireless signals for increased wireless coverage using power lines
AU2001247249A1 (en) * 2000-02-29 2001-09-12 Inari, Inc. High data-rate powerline network system and method
US6735561B1 (en) * 2000-03-29 2004-05-11 At&T Corp. Effective deployment of temporal noise shaping (TNS) filters
US7099830B1 (en) * 2000-03-29 2006-08-29 At&T Corp. Effective deployment of temporal noise shaping (TNS) filters
US6842459B1 (en) 2000-04-19 2005-01-11 Serconet Ltd. Network combining wired and non-wired segments
US6417762B1 (en) 2001-03-30 2002-07-09 Comcircuits Power line communication system using anti-resonance isolation and virtual earth ground signaling
US7069091B2 (en) 2001-11-01 2006-06-27 Salton, Inc. Intelligent microwave oven appliance
US7151968B2 (en) 2001-11-01 2006-12-19 Salton, Inc. Intelligent coffeemaker appliance
JP3927463B2 (ja) * 2002-07-30 2007-06-06 トヨタ自動車株式会社 ディジタル信号処理受信装置
US20060152344A1 (en) * 2002-12-07 2006-07-13 Mowery Richard A Jr Powerline Communication Network Handoff
IL154921A (en) 2003-03-13 2011-02-28 Mosaid Technologies Inc A telephone system that includes many separate sources and accessories for it
KR101353005B1 (ko) 2009-05-07 2014-01-21 버지니아 일렉트릭 앤드 파워 컴퍼니 개선된 미터링 인프라구조 및 변전소 중앙 전압 제어를 이용한 전압 보존
JP5637885B2 (ja) * 2011-02-03 2014-12-10 大崎電気工業株式会社 通信装置
US8861154B2 (en) * 2011-06-21 2014-10-14 Consolidated Edison Company Of New York, Inc. Recloser device and method of operation
US8817438B2 (en) 2011-06-21 2014-08-26 Consolidated Edison Company Of New York, Inc. Recloser device and method of operation
US9065544B2 (en) * 2012-09-28 2015-06-23 Osram Sylvania Inc. Pulse-based binary communication
US9379534B2 (en) 2013-03-13 2016-06-28 Consolidated Edison Company Of New York, Inc. Recloser device and method of operation
US9553453B2 (en) 2013-03-15 2017-01-24 Dominion Resources, Inc. Management of energy demand and energy efficiency savings from voltage optimization on electric power systems using AMI-based data analysis
US9582020B2 (en) 2013-03-15 2017-02-28 Dominion Resources, Inc. Maximizing of energy delivery system compatibility with voltage optimization using AMI-based data control and analysis
US9563218B2 (en) 2013-03-15 2017-02-07 Dominion Resources, Inc. Electric power system control with measurement of energy demand and energy efficiency using t-distributions
US9678520B2 (en) 2013-03-15 2017-06-13 Dominion Resources, Inc. Electric power system control with planning of energy demand and energy efficiency using AMI-based data analysis
US9847639B2 (en) 2013-03-15 2017-12-19 Dominion Energy, Inc. Electric power system control with measurement of energy demand and energy efficiency
US10732656B2 (en) 2015-08-24 2020-08-04 Dominion Energy, Inc. Systems and methods for stabilizer control

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH168545A (de) * 1933-03-13 1934-04-15 Siemens Ag Verfahren und Vorrichtung zum Ausgleichen der Steuerfrequenzabweichungen von einem vorbestimmten Steuerplan in Überlagerungsfernsteueranlagen.
FR769955A (fr) * 1933-06-29 1934-09-05 Siemens Ag Schéma pour un dispositif de réglage à distance, pour la transmission à distance de mesures, d'ordres de manoeuvre et de signaux analogues
FR849344A (fr) * 1938-01-24 1939-11-21 Brown Dispositifs de transmission d'ordres à distance, notamment de télécommande ou de télémesure, principalement pour réseaux à courants forts
DE731114C (de) * 1934-03-23 1943-02-03 Siemens Ag Einrichtung zur elektrischen Fernuebertragung von Zeigerstellungen, Kommandos u. dgl.
DE1000511B (de) * 1955-11-22 1957-01-10 Landis & Gyr Ag Verfahren zur tonfrequenten UEberlagerung von Energieuebertragungsnetzen mit Steuerimpulsen
FR1265672A (fr) * 1960-08-20 1961-06-30 Siemens Ag Installation de transmission de signaux par liaisons sujettes à des perturbations, notamment pour lignes à haute tension
US3909618A (en) * 1973-01-19 1975-09-30 Sharp Kk Carrier transmission system utilizing commercial power lines as transmission lines

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH404774A (de) * 1963-03-25 1965-12-31 Electrometre Einrichtung zur Fernübertragung von Signalen über ein Versorgungsnetz für elektrische Energie
CH504139A (de) 1970-06-11 1971-02-28 Landis & Gyr Ag Verfahren zur Signalübertragung über Leitungen eines Wechselstrom-Verteilungsnetzes durch impulsförmige Überlagerung von tonfrequenten Schwingungen
NL7306902A (US06534493-20030318-C00342.png) * 1972-05-26 1973-11-28
JPS5319166B2 (US06534493-20030318-C00342.png) * 1972-06-12 1978-06-19
DE2239113A1 (de) 1972-08-09 1974-02-21 Licentia Gmbh Geraet zur zeitlichen expansion eines zeitkomprimiert uebertragenen signals
US3975763A (en) * 1973-04-30 1976-08-17 Victor Company Of Japan, Limited Signal time compression or expansion system
US3909821A (en) 1973-10-04 1975-09-30 Gen Public Utilities Communicating over power lines
IT1021020B (it) * 1974-05-27 1978-01-30 Telettra Lab Telefon Sistema e dispositivi di comunica zione con segnali codificati p.c.m. a ridondanza ridotta
JPS5124324A (ja) * 1974-06-27 1976-02-27 Otsutoo Boode Taipuraitanoserekutosochi
JPS5125282A (ja) * 1974-08-27 1976-03-01 Yaskawa Denki Seisakusho Kk Roorakonbeanobunkihansosochi

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH168545A (de) * 1933-03-13 1934-04-15 Siemens Ag Verfahren und Vorrichtung zum Ausgleichen der Steuerfrequenzabweichungen von einem vorbestimmten Steuerplan in Überlagerungsfernsteueranlagen.
FR769955A (fr) * 1933-06-29 1934-09-05 Siemens Ag Schéma pour un dispositif de réglage à distance, pour la transmission à distance de mesures, d'ordres de manoeuvre et de signaux analogues
DE731114C (de) * 1934-03-23 1943-02-03 Siemens Ag Einrichtung zur elektrischen Fernuebertragung von Zeigerstellungen, Kommandos u. dgl.
FR849344A (fr) * 1938-01-24 1939-11-21 Brown Dispositifs de transmission d'ordres à distance, notamment de télécommande ou de télémesure, principalement pour réseaux à courants forts
DE1000511B (de) * 1955-11-22 1957-01-10 Landis & Gyr Ag Verfahren zur tonfrequenten UEberlagerung von Energieuebertragungsnetzen mit Steuerimpulsen
FR1265672A (fr) * 1960-08-20 1961-06-30 Siemens Ag Installation de transmission de signaux par liaisons sujettes à des perturbations, notamment pour lignes à haute tension
US3909618A (en) * 1973-01-19 1975-09-30 Sharp Kk Carrier transmission system utilizing commercial power lines as transmission lines

Also Published As

Publication number Publication date
GB1604136A (en) 1981-12-02
DE2727263B2 (de) 1979-03-29
JPS59114647U (ja) 1984-08-02
US4307380A (en) 1981-12-22
DE2727263A1 (de) 1978-11-23
FR2391585B1 (US06534493-20030318-C00342.png) 1984-04-27
JPS53142114A (en) 1978-12-11
NL7805255A (nl) 1978-11-21
CH604409A5 (US06534493-20030318-C00342.png) 1978-09-15

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