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US2385673A - Carrier current system - Google Patents

Carrier current system Download PDF

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Publication number
US2385673A
US2385673A US49629943A US2385673A US 2385673 A US2385673 A US 2385673A US 49629943 A US49629943 A US 49629943A US 2385673 A US2385673 A US 2385673A
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Grant
Patent type
Prior art keywords
carrier
current
system
feeder
generator
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
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John L Woodworth
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General Electric Co
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General Electric Co
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    • 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
    • H02J13/0006Circuit 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 for single frequency AC networks
    • H02J13/0013Circuit 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 for single frequency AC networks characterised by transmission structure between the control or monitoring unit and the controlled or monitored unit
    • H02J13/0086Circuit 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 for single frequency AC networks characterised by transmission structure between the control or monitoring unit and the controlled or monitored unit with transmission using plurality of intermediate treatment level between the control or monitoring unit and the controlled or monitored unit
    • H02J13/0089Circuit 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 for single frequency AC networks characterised by transmission structure between the control or monitoring unit and the controlled or monitored unit with transmission using plurality of intermediate treatment level between the control or monitoring unit and the controlled or monitored unit using the power network as transmission support
    • 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 GASES [GHG] EMISSION, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/70Systems integrating technologies related to power network operation and communication or information technologies mediating in the improvement of the carbon footprint of electrical power generation, transmission or distribution, i.e. smart grids as enabling technology in the energy generation sector not used, see subgroups
    • Y02E60/78Communication technology specific aspects
    • Y02E60/7807Details of the transmission structure or support between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y02E60/7815Details of the transmission structure or support between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission
    • 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
    • Y04S40/00Communication or information technology specific aspects supporting electrical power generation, transmission, distribution or end-user application management
    • Y04S40/10Communication technology specific aspects
    • Y04S40/12Details of the transmission structure or support between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/121Using the power network as support for the transmission

Description

' Sept25, 1945. J, L. WOODWbRTH 2,385,673

CARRIER CURRENT SYSTEM Filed July 27, 1943 Fig.1,

/ TRANSMITTER Elk His Attorney.

Patented Sept. 25, 1945 I UNITED STATES PATENT OFFICE CARRIER CURRENT SYSTEM John L. Woodworth, Schenectady, N. Y., assignor to General Electric Company, a corporation of New York Application July 27, 1943, Serial No. 496,299

7 Claims.

The present invention relates to a carrier current system for application to a plurality of interconnected feeders each having a carrier current transmitter and one or more carrier current receivers. In such systems it is desirable that the carrier current transmitter for one of the feeders affect only the receivers associated with that feeder, particularly in the case where the receivers are relays for carrying out switching operations.

' Under some circumstances it has been found.

that the carrier current voltage at the interconnection of the feeders from one of the, transmit ters is sufiiciently great to affect receivers associated with another of the transmitters.

stood by reference to the following description taken in connection with the accompanying drawing in which Fig. 1 represents a carrier current system embodying my invention; Fig. 2 is a modification of the transmitter for substitution in Fig. l; and Fig. 3 represents another carrie current system.

Referring to Fig. 1 of the drawing there is shown a carrier current system comprising transmitters I and 2 and receivers 3 and 4 respectively primary windings l I of the coupling transformers which parallel tune the coupling transformers to serve as wave traps. The parallel tuning of the coupling transformers presents a high impedanceto carrier current voltages fed from one of the transmitters through the interconnecting power transmission line to a feeder associated with the other transmitter. For example, under the condition under which the transmitter l is sending and the transmitter 2 is idle, the carriercurrent voltage from the transmitter I encounters a high impedance at the coupling transformer of the transmitter 2 and accordingly cannot affect the receiver 4. For effective operation it is obviously necessary that the transmitters be arranged intermediate the associated receivers and the interconnection between the feeders.

The system of Fig. 1 does not provide protcc tion for the case in which the transmitters I and 2 are'simultaneously energized. For this condition, which may occur at infrequent intervals,

the parallel tuning of the coupling transformers is impaired by the parallel circuit through condenser lfl, key 9, and generator 8, and the carrier current voltage from on of the transmitters may affect a receiver associated with the other transinitter.

stituted for either of the transmitters in Fig.1.

the coupling transformer 12 is shunted by two parallel circuits each of which includes a conassociated with feeders 5 and 6 interconnected by a power transmission line I. l and 2 operate at or near the same carrier frequency and are intended to control only the re-' ceivers 3 and 4 respectively. Each of the transmitters comprises a generator 8 connected through a key 9 and a blocking condenser 10 across the primary ll of a coupling transformer I! having a secondary l3 connected in series with one of the feeders 5 or 6. When one of the keys 9 is closed, a carrier current voltage is impressed onthe associated feeder through the coupling transformer and provides the signal for operating the associated. receiver. A carrier .current voltage is also impressed across the impedance of the circuit comprising the power generator 35 and the interconnecting power transmission line 1 and, while the voltage across the power transmission line is generally small, it is under some conditions sufficient to result in the impression of The transmitters denser M or iii and one of the poles I6 or H of a two-pole keying switch l8. The carrier current generator 8, which has an inductance 'represented at I9, is connected across one of the poles H of the keying switch so that the generator is shorted when the keying switch is closed. When the keying switch is closed, the condensers H and I5 in parallel tune the coupling transformer I! as a wave trap. When the keying switch is open, the circuit through the condenser H is opened and the condenser I5 is connected in series with the generator 8 across the primary winding H. The condenser l5 parallel tunes the coupling transformer as a wave trap. With the transmitter of Fig. 2 the coupling transformer I2 is at all times tuned as a wave trap to prevent interference due to other carrier signals.

. 'In-the modification shown in Fig. 3 feeders 20 and 2|, having respectively associated therewith erator 28 having an inductance represented at 30 connected through a keying switch 3| and a series circuit including condensers 32 andinductance 33 across the feeder conductors. The

keying switches 3| have two positions, one con- This disadvantage is overcome by the transmitter shown in Fig. 2 which may be submy invention.

erator so as to impress a carrier current. voltage fromthe generator across the respective feeder,

and the other position in which th'ecircuit to the generator is opened and the keying switch is closed on an inductance 34,'having the same value as the inductance 30, which completes an sisting of the condensers 32, inductance l3, and either of identical inductances 30 or 34. These alternative series circuit across the" respective feeder. In either position of the keying switch there is a series circuit across the feeders con- 1 series circuits are tuned for resonance at the carrier current frequency and accordingdy short circuit carrier current voltages fed to the respective feeders from the transmission line 26.v Since the transmitters are located intermediate the associated receivers and the interconnecting transmission line 26, a carriercurrent-voltage fed from one of the transmitters through the interconnecting transmission lineto another feeder is short circuited by the seriescoupling circuit associated with that feeder. This prevents undesired operation of one of the receivers by signals from a transmitter associated with another feeder.

Itis importantthat the coupling circuit be i tunedso as to short circuit thepundesired carrier voltage at the points of connection of the series circuit to the feeder. If the tuning of the series circuit were such as to provide series resonance at carrier frequency for the circuit, which also included the feeder to the'assocl'ated receiver,

under some conditions. the series circuit associated with the transmitter would increase rather than decrease interference due to'carrier voltages fed through the interconnecting trans mission line 26.

While I have shown particular embodiments of my invention. it will be understood that many modifications may be made from the spirit thereof, and the appended claims to cover tions as fall within without departing I contemplate by any such modifiesthe true'spirit and scope of desire to secure by States, is.

What I claim as new and Letters Patent of theUnited 1. In a carrier current system for a' power sys-Z tem including a plurality of feeders, a carrier rent transmitter associated with each of said.

feeders, each said transmitter including a carrier nested inseries with the carrier current gene 'rent signals from another source in both open and closed positions of the keying switch.

3. In a carrier current system. a feedercon nected to,,.a power system, a carrier current receiver associated with the feeder, a carrier current generator having a predetermined inductance, a series resonant circuit shunted across the feeder intermediate the receiver and the power system for short circuiting signalsof car-v rier current from the power system and thereby preventing false operation of the receiver, saidnected to a power system, a carriercurrent receiver associated with the feeder, a carrier cur-j rent generator having a predetermined induc tance, a series resonant circuit shunted across the feeder intermediate the receiver and thepower system for short. circuiting signals of carrier current from the power system and thereby A preventing false operation of the receiver, said series circuit including a keying switch in one position connecting the generator as part of the circuit and in another position disconnecting the generator and connecting an inductance. of said predetermined value as part of said circui 5. In a carrier system, a coupling transformer having a secondary for connection in series with a feeder and a primary having shunt connected tuning means, switching means for connecting the carrier current generator to said primary and for switching said tuning means so that the transformer is a parallel tuned trap for carrier current signals from another source when the generator is either connected to or. disconnected from said primary.

6. In a carrier current system for a power system including a plurality of interconnected feeders, a carrier current receiver and a carrier cur-- current generator, means for coupling said generator to its feeder intermediate the associated receiver andthe interconnection of said feeders,

two-position keying means for selectively disabling said transmitter or rendering said transmeans'including a resonant circuit tuned to the carrier current frequency for selectively 0011-" nesting each said transmitter to the associated feeder at a point intermediate the connected receiver and. power system, the resonantcircults associated with non-selected feeders serving as wave traps for signals of carrier frequency fed through the power system from selected transmitters thereby to render receivers connected tench-selected feedersmon-responsive to carrier current signals on selected feeders.-

2. In a carrier current system, a coupling transformer having a secondary for connection in series with a feeder and aprimary'shunted by two parallel circuits, each circuit including a parallel tuned as a wave trap for carrier curmitter operative to'impress a carrier current signal upon the associated feeder, and means including said coupling means for tuning each said transmitter as a wave trap for undesired carrier current signals from any other transmitter through said interconnection in both positions of said keying means. I

' '1. In a carrier current system .for a power system including a plurality of interconnected feeders. a carrier current receiv'enand a carrier current transmitter associated with each feeder. each said transmitter including a carrier current generator, means for coupling each said generator toits feeder intermediate the associated receiver and the interconnection of said feeders, and keying means for selectively disconnecting each said generator or connecting said generator to impress a carrier current signal upon its feeder, said keying means including switching means for tuning the associated coupling means alone as a wave trapwhen said generator is disconnected and tuning said coupling means and a generator together as a wave trap when said generator is connected to its feeder, thereby to preclude the reception of signals by any receiver through said interconnection.

' JO HN L. WOODWQBTB, a,

US2385673A 1943-07-27 1943-07-27 Carrier current system Expired - Lifetime US2385673A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2551696A (en) * 1945-07-06 1951-05-08 Landis & Gyr Ag Transformer
US2567148A (en) * 1946-06-15 1951-09-04 Nederlanden Staat Telephone signaling device
DE963526C (en) * 1952-10-16 1957-05-09 Standard Elektrik Ag Transmitting arrangement to Signaluebertragung on telephone lines
US3229300A (en) * 1961-01-31 1966-01-11 Ralph J Thompson Data gathering and recording system
US3388389A (en) * 1964-06-09 1968-06-11 Davis Foreman Alarm systems
US3393365A (en) * 1963-11-21 1968-07-16 Nippon Electric Co Transmitter system comprising a plurality of interswitchable transmitters
US4032911A (en) * 1976-02-26 1977-06-28 Westinghouse Electric Corporation Signal repeater for power distribution line communication systems
US4319224A (en) * 1978-06-08 1982-03-09 Siemens Aktiengesellschaft Powerline carrier control system with powerline current compensation
EP0093882A1 (en) * 1982-04-22 1983-11-16 Siemens Aktiengesellschaft Coupling stage for coupling coded information on a phase line of an electric network
US4417207A (en) * 1981-03-13 1983-11-22 Tohoku Metal Industries, Ltd. Circuit for injecting simulating-noise signals in a power line
US4766414A (en) * 1986-06-17 1988-08-23 Westinghouse Electric Corp. Power line communication interference preventing circuit
US5070328A (en) * 1986-08-25 1991-12-03 N.V. Nederlandsche Apparatenfabriek Method of checking the loading and unloading of tankers by means of an electromagnetic identification system, and an identification system for use in said method
US20110196541A1 (en) * 2010-02-09 2011-08-11 Nelson Irrigation Corporation Inductively coupled distributed control system

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2551696A (en) * 1945-07-06 1951-05-08 Landis & Gyr Ag Transformer
US2567148A (en) * 1946-06-15 1951-09-04 Nederlanden Staat Telephone signaling device
DE963526C (en) * 1952-10-16 1957-05-09 Standard Elektrik Ag Transmitting arrangement to Signaluebertragung on telephone lines
US3229300A (en) * 1961-01-31 1966-01-11 Ralph J Thompson Data gathering and recording system
US3393365A (en) * 1963-11-21 1968-07-16 Nippon Electric Co Transmitter system comprising a plurality of interswitchable transmitters
US3388389A (en) * 1964-06-09 1968-06-11 Davis Foreman Alarm systems
US4032911A (en) * 1976-02-26 1977-06-28 Westinghouse Electric Corporation Signal repeater for power distribution line communication systems
US4319224A (en) * 1978-06-08 1982-03-09 Siemens Aktiengesellschaft Powerline carrier control system with powerline current compensation
US4417207A (en) * 1981-03-13 1983-11-22 Tohoku Metal Industries, Ltd. Circuit for injecting simulating-noise signals in a power line
EP0093882A1 (en) * 1982-04-22 1983-11-16 Siemens Aktiengesellschaft Coupling stage for coupling coded information on a phase line of an electric network
US4766414A (en) * 1986-06-17 1988-08-23 Westinghouse Electric Corp. Power line communication interference preventing circuit
US5070328A (en) * 1986-08-25 1991-12-03 N.V. Nederlandsche Apparatenfabriek Method of checking the loading and unloading of tankers by means of an electromagnetic identification system, and an identification system for use in said method
US20110196541A1 (en) * 2010-02-09 2011-08-11 Nelson Irrigation Corporation Inductively coupled distributed control system
US9128489B2 (en) * 2010-02-09 2015-09-08 Nelson Irrigation Corporation Inductively coupled distributed control system

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