GB1461912A - Signalling over energised electric power lines - Google Patents

Signalling over energised electric power lines

Info

Publication number
GB1461912A
GB1461912A GB4032573A GB4032573A GB1461912A GB 1461912 A GB1461912 A GB 1461912A GB 4032573 A GB4032573 A GB 4032573A GB 4032573 A GB4032573 A GB 4032573A GB 1461912 A GB1461912 A GB 1461912A
Authority
GB
United Kingdom
Prior art keywords
frequency
mains
power lines
mains frequency
different
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.)
Expired
Application number
GB4032573A
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.)
Electricity Council
Original Assignee
Electricity Council
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 Electricity Council filed Critical Electricity Council
Priority to GB4032573A priority Critical patent/GB1461912A/en
Publication of GB1461912A publication Critical patent/GB1461912A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/542—Systems for transmission via power distribution lines the information being in digital form
    • 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
    • H02J13/00007—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 the power network as support for the transmission
    • H02J13/00009—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 the power network as support for the transmission using pulsed signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
    • H04B2203/5416—Methods of transmitting or receiving signals via power distribution lines by adding signals to the wave form of the power source
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
    • H04B2203/5425—Methods of transmitting or receiving signals via power distribution lines improving S/N by matching impedance, noise reduction, gain control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5433—Remote metering

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

1461912 Signalling over power lines ELECTRICITY COUNCIL 28 Oct 1974 [24 Aug 1973] 40325/73 Heading H4R One or more non-oscillatory loads 13 are switched in and out of shunt connection across power lines 11, 12 for at least one half-cycle at a rate or successively different rates less than power frequency in response to keying 20 according to encoded data for power line transmission. As shown, mains frequency is 90 degrees delayed, 16, then shaped, 17, and divided by two at 18 to produce a square wave signal at half mains frequency and with a 1 : 1 mark/ space ratio causing pulse generator 19 to fire a triac 14 allowing capacitor 13 to charge and discharge once during alternate mains cycles provided the key 20 is closed. The encoded data operates the key at a lower bit frequency than the trigger pulses. The signal so produced contains side-bands spaced at half mains frequency above and below mains frequency which are detected at a central receiver, e.g. for centralized meter reading. Different divisors in divider 18 and different mark/space ratios generate different side-band frequencies. In Fig. 2 (not shown), antiphase trigger pulses alternately shunt the capacitor 13 and an inductor (31) of equal reactance across the power lines. Alternatively, the divisors may be alternately two or four and the relative phases of the trigger pulses may be successively different for frequency and phase shift keying respectively. Knowing the nature of the transmitter keying, the receiver includes a current transformer (50, Figs. 5-8, not shown) feeding bandpass filters tuned to the expected sideband frequencies on either side of mains frequency which are threshold detected and added to produce a logic decision that the information received relates to transmitted data. Only one side-band need be detected if the S/N ratio is high. The received signal may alternatively be mixed with a lower frequency to extract the load switching rate directly. To detect phase shift keyed data, a reference phase signal is derived from the mains by 90 degrees delaying, shaping and dividing down to the load switching rate at the transmitter for comparison with the phases of the received sideband frequencies (Fig. 8, not shown).
GB4032573A 1973-08-24 1973-08-24 Signalling over energised electric power lines Expired GB1461912A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4032573A GB1461912A (en) 1973-08-24 1973-08-24 Signalling over energised electric power lines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4032573A GB1461912A (en) 1973-08-24 1973-08-24 Signalling over energised electric power lines

Publications (1)

Publication Number Publication Date
GB1461912A true GB1461912A (en) 1977-01-19

Family

ID=10414346

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4032573A Expired GB1461912A (en) 1973-08-24 1973-08-24 Signalling over energised electric power lines

Country Status (1)

Country Link
GB (1) GB1461912A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038877A1 (en) * 1980-04-28 1981-11-04 Paul Rouet Process and system for transmitting information and instructions on an alternating current distribution network
WO2000029857A1 (en) * 1998-11-12 2000-05-25 Hunt Technologies, Inc. Integrated power line metering and communication method and apparatus
ITTO20120736A1 (en) * 2012-08-21 2014-02-22 Ecnologica S C P A "CONTROL DEVICE FOR A APPLIANCE"

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038877A1 (en) * 1980-04-28 1981-11-04 Paul Rouet Process and system for transmitting information and instructions on an alternating current distribution network
WO2000029857A1 (en) * 1998-11-12 2000-05-25 Hunt Technologies, Inc. Integrated power line metering and communication method and apparatus
US6177884B1 (en) 1998-11-12 2001-01-23 Hunt Technologies, Inc. Integrated power line metering and communication method and apparatus
ITTO20120736A1 (en) * 2012-08-21 2014-02-22 Ecnologica S C P A "CONTROL DEVICE FOR A APPLIANCE"

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee