US2032360A - Power line carrier system - Google Patents

Power line carrier system Download PDF

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Publication number
US2032360A
US2032360A US501985A US50198530A US2032360A US 2032360 A US2032360 A US 2032360A US 501985 A US501985 A US 501985A US 50198530 A US50198530 A US 50198530A US 2032360 A US2032360 A US 2032360A
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US
United States
Prior art keywords
line
power
impedance
current
transformers
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 - Lifetime
Application number
US501985A
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English (en)
Inventor
Estill I Green
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.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
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 American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Priority to US501984A priority Critical patent/US2048091A/en
Priority to US501985A priority patent/US2032360A/en
Priority to FR726876D priority patent/FR726876A/fr
Application granted granted Critical
Publication of US2032360A publication Critical patent/US2032360A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/56—Circuits for coupling, blocking, or by-passing of signals

Definitions

  • the present invention resides in a network for terminating a power line at high frequencies, which network isieifectively connected with the system by utilizing a portion of the apparatus normally employed in the power system-namely, the current transformers that are connected with the powerline for the purpose o f measuring the magnitudes 'of the power currents flowing thereover.
  • FIG. 1 shows schematically a network to terminate completely a three-phase transmission line at 'carrier fre- "quencies
  • Fig. 2 shows a modincation of cthe invention for use' in terminating a single phase o carrier circuit derived from a three-phase power line.
  • I, 2 and 3 represent the conductors of a three-phase spurrline L, which is connected with the main transmission line at the point X.'
  • apparatus 4 is llocated are the currrent transformers T1, Tz and Ts', having their primary windings connectedin series with the said conductors. lIhese transformers forni part of the 55 apparatus normally employed at a power station quencies.
  • the secondary winding of -transformer T1 is 'connected with a current measuring instrument A1, and in like manner the corresponding windings of Atransformers T2 5 and T: are connected with the instruments Az and Aa.
  • Such instruments would normally be connected in series with the said secondary windings and -ground to indicate the magnitudes of the currents flowing over the conductors of the lo line L.
  • inductances I2 and I3 andv condenser I4 are connected between conductors 30 5 and 1; and likewise, inductances I5 and I6 and condenser I1 are ⁇ connected between coni ductors 5 and G;
  • the resistance I8 is shunted across inductance I0, resistance I9 across inductance I3, and resistance 20 across inductance 35 ⁇ I6.
  • , 22 and 23 shunt the current measuring instruments A1, A2 and A3, respectively, for the carrier frequencies.
  • the combination of the terminating networks and the impedancenetworks, as shown in 'th'e spur line, provides a smooth termination of that line at carrier frequencies and thus elim; inates an impedance irregularity in the system.
  • the terminating arrangement of Fig. 1 may bef advantageously lemployed in reducing the en'ect upon a power ⁇ system of transient currents that result from short circuits, lightning, etc. Since the arrangement effectively terminates the line in an impedance approximating its characteristic impedance, it prevents the building up of high potentials by shocked by transients, lightning, etc.
  • Fig. 42 shows the applicationof the invention for'terminating one phase of a three-phase translthe condenser 32, and as the other pillar the inductance .33, a terminating resistance 34 being shunted across the inductance 33.
  • a network may be designed to give a constant impedance of suitable value atall frequencies above the critical frequency of the iilter, while the inductance aiords free passage to the power currents.
  • a multi-phase transmission line each conductor of said line having connected in series therewith the primary winding of a current transformer, all secondary windings of said current transformers having one terminal connected to a common conductor,- an inductance connected "line at frequencies substantially .frequency of vsaid power, currents.
  • each of said current measuring devices being shunted by a condenser, said inductances forming partl of a 5 multi-phase wave filter, said wave filter being terminated inv resistances, the combination of said current transformers, current measuring devices, wave filter and terminating resistances presenting a low impedance to said power cur- 10 rents and being so proportioned as to terminate saidtransmission line at canier frequencies Ain p former, each .ofsaid current measuring devices 25 being shunted by a condenser, said4 inductances v 'forming partA of a multi-phase wave lter, said f wave filter being terminated in resistances, the Y impedance presented by saidwave iiltery at carrier frequencies being approximately equal to the 3o characteristic impedance vof said transmission line divided by the-impedance 'transformation ratio of said current" transformers.
  • a multi-,phase transmission line each 3'5 conductor of said line having connected in se ries therewith the primary winding of arcurrent rtransformer, all secondary windings ⁇ oi said vcurrent transformers having one terminal connected Y to a common conductor, an inductance connect- 40 ed in series with'a currentmeasuring device beY tween said common conductor and the other ter ⁇ minal of the secondary winding of each current transformer, each of ysaid current-measuring de vices being shunted bya condenser, each ofthe u saidinductances being.' shunted/by-*a condenser in seriesrwith another inductance and each 6i" said other inductances being shunted by a resistance.
  • the said inductances and intermediate condensers ⁇ being -so proportioned as to form a 50 multi-phase wave filter capable of passing frequencies substantially higher than the frequency l of said power currents.

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  • 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)
  • Measurement Of Resistance Or Impedance (AREA)
US501985A 1930-12-12 1930-12-12 Power line carrier system Expired - Lifetime US2032360A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US501984A US2048091A (en) 1930-12-12 1930-12-12 Power line carrier system
US501985A US2032360A (en) 1930-12-12 1930-12-12 Power line carrier system
FR726876D FR726876A (fr) 1930-12-12 1931-11-25 Systèmes électriques de signalisation par ondes porteuses utilisant des lignes à haute intensité

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US501984A US2048091A (en) 1930-12-12 1930-12-12 Power line carrier system
US501985A US2032360A (en) 1930-12-12 1930-12-12 Power line carrier system

Publications (1)

Publication Number Publication Date
US2032360A true US2032360A (en) 1936-03-03

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
US501985A Expired - Lifetime US2032360A (en) 1930-12-12 1930-12-12 Power line carrier system
US501984A Expired - Lifetime US2048091A (en) 1930-12-12 1930-12-12 Power line carrier system

Family Applications After (1)

Application Number Title Priority Date Filing Date
US501984A Expired - Lifetime US2048091A (en) 1930-12-12 1930-12-12 Power line carrier system

Country Status (2)

Country Link
US (2) US2032360A (fr)
FR (1) FR726876A (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2743434A (en) * 1952-12-27 1956-04-24 Hugh B Fleming System of carrier current distribution
US3895370A (en) * 1972-07-04 1975-07-15 Sits Soc It Telecom Siemens High-frequency communication system using A-C utility lines
US3924223A (en) * 1974-02-21 1975-12-02 Westinghouse Electric Corp Power line communication system having a protective terminating impedance arrangement
US3993989A (en) * 1975-05-19 1976-11-23 Trw Inc. ELF communications system using HVDC transmission line as antenna
EP0115815A1 (fr) * 1983-02-08 1984-08-15 Siemens Aktiengesellschaft Circuit pour la transmission de signaux à fréquence acoustique sur un transformateur de réseau
US5554968A (en) * 1994-08-22 1996-09-10 Lee; Raymond Data communication using power lines
US6492897B1 (en) 2000-08-04 2002-12-10 Richard A. Mowery, Jr. System for coupling wireless signals to and from a power transmission line communication system
US20050254516A1 (en) * 2000-04-19 2005-11-17 Serconet, Ltd. Network combining wired and non-wired segments
US20070147413A1 (en) * 1998-07-28 2007-06-28 Israeli Company Of Serconet Ltd. Local area network of serial intelligent cells
US20070147433A1 (en) * 2003-03-13 2007-06-28 Serconet Ltd. Telephone system having multiple distinct sources and accessories therefor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324417A (en) * 1965-03-25 1967-06-06 Gen Cable Corp Shielded common return pairs and coaxial cable
US3964048A (en) * 1974-01-28 1976-06-15 General Public Utilities Corporation Communicating over power network within a building or other user location

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2743434A (en) * 1952-12-27 1956-04-24 Hugh B Fleming System of carrier current distribution
US3895370A (en) * 1972-07-04 1975-07-15 Sits Soc It Telecom Siemens High-frequency communication system using A-C utility lines
US3924223A (en) * 1974-02-21 1975-12-02 Westinghouse Electric Corp Power line communication system having a protective terminating impedance arrangement
US3993989A (en) * 1975-05-19 1976-11-23 Trw Inc. ELF communications system using HVDC transmission line as antenna
EP0115815A1 (fr) * 1983-02-08 1984-08-15 Siemens Aktiengesellschaft Circuit pour la transmission de signaux à fréquence acoustique sur un transformateur de réseau
US5554968A (en) * 1994-08-22 1996-09-10 Lee; Raymond Data communication using power lines
US8867523B2 (en) 1998-07-28 2014-10-21 Conversant Intellectual Property Management Incorporated Local area network of serial intelligent cells
US7978726B2 (en) 1998-07-28 2011-07-12 Mosaid Technologies Incorporated Local area network of serial intelligent cells
US20070147413A1 (en) * 1998-07-28 2007-06-28 Israeli Company Of Serconet Ltd. Local area network of serial intelligent cells
US8908673B2 (en) 1998-07-28 2014-12-09 Conversant Intellectual Property Management Incorporated Local area network of serial intelligent cells
US7424031B2 (en) 1998-07-28 2008-09-09 Serconet, Ltd. Local area network of serial intelligent cells
US8885659B2 (en) 1998-07-28 2014-11-11 Conversant Intellectual Property Management Incorporated Local area network of serial intelligent cells
US7852874B2 (en) 1998-07-28 2010-12-14 Mosaid Technologies Incorporated Local area network of serial intelligent cells
US8885660B2 (en) 1998-07-28 2014-11-11 Conversant Intellectual Property Management Incorporated Local area network of serial intelligent cells
US8873586B2 (en) 2000-04-19 2014-10-28 Conversant Intellectual Property Management Incorporated Network combining wired and non-wired segments
US7933297B2 (en) 2000-04-19 2011-04-26 Mosaid Technologies Incorporated Network combining wired and non-wired segments
US8848725B2 (en) 2000-04-19 2014-09-30 Conversant Intellectual Property Management Incorporated Network combining wired and non-wired segments
US8867506B2 (en) 2000-04-19 2014-10-21 Conversant Intellectual Property Management Incorporated Network combining wired and non-wired segments
US20050254516A1 (en) * 2000-04-19 2005-11-17 Serconet, Ltd. Network combining wired and non-wired segments
US8873575B2 (en) 2000-04-19 2014-10-28 Conversant Intellectual Property Management Incorporated Network combining wired and non-wired segments
US7876767B2 (en) 2000-04-19 2011-01-25 Mosaid Technologies Incorporated Network combining wired and non-wired segments
US8982904B2 (en) 2000-04-19 2015-03-17 Conversant Intellectual Property Management Inc. Network combining wired and non-wired segments
US8982903B2 (en) 2000-04-19 2015-03-17 Conversant Intellectual Property Management Inc. Network combining wired and non-wired segments
US6492897B1 (en) 2000-08-04 2002-12-10 Richard A. Mowery, Jr. System for coupling wireless signals to and from a power transmission line communication system
US7656904B2 (en) 2003-03-13 2010-02-02 Mosaid Technologies Incorporated Telephone system having multiple distinct sources and accessories therefor
US20070147433A1 (en) * 2003-03-13 2007-06-28 Serconet Ltd. Telephone system having multiple distinct sources and accessories therefor

Also Published As

Publication number Publication date
US2048091A (en) 1936-07-21
FR726876A (fr) 1932-06-04

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