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| Number | Title | Issue Date |
| 7301440 | Power line communication system and method The present invention provides a device for providing communications through power lines comprised of multiple conductors by transmitting the data signals through a plurality of the conductors. One embodiment of the present invention may be comprised of a transmit c... | 11/27/2007 |
| 7231003 | System and method for aligning data between local and remote sources thereof The communication system includes two communication channels for communication of protection and control information between two protective relays on a power line portion of an electric power system. A switch provided at the receiving relay connects one communicatio... | 06/12/2007 |
| 7154722 | Loop control for distribution systems The invention contemplates a technique for providing loop control on a faulted overhead or underground loop system, while preventing restored current from being fed or back fed into the fault. In particular, the invention provides a method, device, and system for re... | 12/26/2006 |
| 7102478 | Power line coupling device and method of using the same The coupling device of the present invention includes a housing, a first fastening member attached to said housing and coupled to the power line, a second fastening member attached to the housing and coupled to the power line, an inductor providing an impedance to d... | 09/05/2006 |
| 7103240 | Method and apparatus for providing inductive coupling and decoupling of high-frequency, high-bandwidth data signals directly on and off of a high voltage power line The present invention is drawn to an electrically “closed” method and apparatus for transmitting and receiving data signals over a high voltage power line. Inductive coupling is employed for coupling and decoupling the data signal directly on to and off of a sin... | 09/05/2006 |
| 7075414 | Device and method for communicating data signals through multiple power line conductors The present invention provides a device for providing communications through power lines comprised of multiple conductors by transmitting the data signals through a plurality of the conductors. One embodiment of the present invention may be comprised of a transmit c... | 07/11/2006 |
| 7061370 | High current inductive coupler and current transformer for power lines There is provided an inductive power line data coupler. The coupler includes (a) a magnetic core having a high magnetic permeability at a data communication frequency and being configured to allow a power line of a power distribution system to be routed through the ... | 06/13/2006 |
| 7053756 | Facilitating communication of data signals on electric power systems The invention includes a method, system, and device for communicating a data signal on an electric power system. The inventive method includes communicating the data signal to the electric power system, and modifying the characteristics of the electric power system ... | 05/30/2006 |
| 7046124 | Power line coupling device and method of using the same The coupler of the present invention couples broadband RF signals to and from a power line conductor. The coupler of one embodiment that is for use with overhead power lines includes a length of URD MV cable with the neutral conductor removed and that is communicati... | 05/16/2006 |
| 7042351 | Data communication over a power line Data signals are communicated between a power line and a computer, wherein the power line provides power to the computer via a distribution transformer and the computer is in communication with a wireless communication path. A first data signal is communicated with ... | 05/09/2006 |
| 6998962 | Power line communication apparatus and method of using the same A communication device for use with a power line communication system is provided. One embodiment forms a bypass device and comprises a low voltage coupler, a low voltage signal conditioner, a controller, a medium voltage modem, a first medium voltage signal conditi... | 02/14/2006 |
| 6998848 | Method for producing a fault signal which indicates a short to ground A method and apparatus for producing a fault signal are disclosed which indicate a short to ground on a polyphase power transmission line, in which, the phase currents on the power transmission line are detected by means of current transformers in order to form a su... | 02/14/2006 |
| 6980091 | Power line communication system and method of operating the same The present invention provides a system for operating a power line communications system that is comprised of a plurality of network elements, which may take the form of repeaters, bypass devices, backhaul devices, wireless backhaul devices, enhanced bypass device, ... | 12/27/2005 |
| 6980090 | Device and method for coupling with electrical distribution network infrastructure to provide communications A device for providing communications through power lines that are communicatively coupled to an electrical distribution network infrastructure and to the internal wiring of at least one customer premises having one or more communication devices therein is provided.... | 12/27/2005 |
| 6980089 | Non-intrusive coupling to shielded power cable The invention describes a method and a device for transporting a signal over a power line. The inventive method includes inducing an alternating current (AC) voltage from the power line, powering a transceiver device with the induced AC voltage, communicating the si... | 12/27/2005 |
| 6977578 | Method of isolating data in a power line communications network Isolating data in a power line communications system. Although plural subscribers receive electric power distributed from a common distribution transformer, it is desirable to isolate their branch lines from one another when those branch lines are used to conduct da... | 12/20/2005 |
| 6965302 | Power line communication system and method of using the same The communication system of one embodiment is for communicating data through a power distribution system having a medium voltage power line and low voltage power line and comprises a first device comprising a first wireless transceiver, a first modem in communicatio... | 11/15/2005 |
| 6965303 | Power line communication system and method A method of communicatively coupling power line communication (PLC) devices to a first and second overhead power line conductor that travel in a substantially parallel physical arrangement and in spaced-apart relation is provided. The method may comprise coupling a ... | 11/15/2005 |
| 6958680 | Power line communication system and method of using the same The last portion of the electrical distribution system is used to provide high-speed communications to residential homes. An aggregation point interfaces a medium voltage power line with a point-of-presence, and a power line bridge enables flow of communications sig... | 10/25/2005 |
| 6950567 | Method and apparatus for providing inductive coupling and decoupling of high-frequency, high-bandwidth data signals directly on and off of a high voltage power line The present invention is drawn to an electrically “closed” method and apparatus for transmitting and receiving data signals over a high voltage power line. Inductive coupling is employed for coupling and decoupling the data signal directly on to and off of a sin... | 09/27/2005 |
| 6933835 | Data communication over a power line A signal is received from a first portion of a power line and at least a portion of the signal is converted to a non-electrically conducting signal. The non-electrically conducting signal may be communicated to a non-electrically conductive communication path. In th... | 08/23/2005 |
| 6914762 | Protection of electrical power lines A method of protecting a section of a three phase power line uses superimposed current components in the power line to enable a local relay to detect operation of remote circuit breakers of remote relays in response to a fault on at least one phase of the power line... | 07/05/2005 |
| 6678182 | Electrical bus with associated porous metal heat sink and method of manufacturing same A module is formed in which semiconductor components are soldered to an electrically conductive heat sink. The electrically conductive heat sink is formed so that it will serve as an electrical bus in an electronic device. The chips of the semiconductor c... | 01/13/2004 |
| 6529394 | Inverter for an electric motor An oil-cooled inverter for an electric traction motor that uses six IGBT switches to generate 3-phase AC electrical current as its output. The switches are mounted on heat sinks that use hot motor oil (hydraulic fluid) as the heat transfer fluid. An inter... | 03/04/2003 |
| 6469629 | Distributed logic in multiple protective relays A protective relay, system, and relay operation method which allows logic functions to be distributed amongst multiple protective relays associated with a power distribution system. The protective relays include communications ports for exchanging message... | 10/22/2002 |
| 6373670 | Fault protection apparatus A fault protection apparatus is disclosed for use in a time graded fault protection scheme. The apparatus comprises a circuit breaker having a normally closed trip contact provided in a line, current measurement apparatus adapted to produce an output sign... | 04/16/2002 |
| 5838525 | High speed single-pole trip logic for use in protective relaying A protective relaying system includes a local protective relay operatively coupled to a protected line segment at a first location, and a remote protective relay operatively coupled to the protected line segment at a second location. The remote protective... | 11/17/1998 |
| 5592354 | Audio bandwidth interface apparatus for pilot wire relays An apparatus for enabling pilot wire relays to communicate across voice-grade, non-metallic communication channels converts sinusoid signals representative of phase currents at a location in an electric power distribution system to audio band signals repr... | 01/07/1997 |
| 5574611 | Service interruption minimizing system for power distribution line Upon the occurrence of a fault on the first distribution line, a faulty section on the distribution line is pinpointed, then a tie point switchgear at the tie point between the first distribution line in which the fault occurred and the other normal secon... | 11/12/1996 |
| 4675774 | Direct transfer trip apparatus for use with an active pilot wire communications channel Direct transfer trip apparatus for sharing a common active communication channel utilized for signal transfer between at least two electromechanical units which form a current differential protective relay for protecting at least one power line in a power... | 06/23/1987 |
| 4675775 | Active pilot wire apparatus for electromechanical current differential relays Active pilot wire apparatus for replacing a passive continuous metallic wire pair coupling between the electromechanical units of a conventional electromechanical pilot wire protective relay is disclosed. For the protection of a power line section, an ele... | 06/23/1987 |
| 4674002 | Directional comparison blocking system An echo-keyed directional comparison blocking system for protecting an electrical power transmission path in a power system network against internal faults is disclosed. The system includes a terminal unit disposed at each end of the transmission path for... | 06/16/1987 |
| 4464697 | Protective relay system Protective relaying apparatus of the pilot type, incorporating a direct transfer trip function (DTT) which reliably and securely utilizes the same communication channel utilized by the pilot relaying function. The DTT function operates within the constrai... | 08/07/1984 |
| 4317151 | Apparatus for fault direction-comparison protection With heretofore known directional comparison protection systems working with fault direction detectors at both ends of a line section which is to be protected and data transmission between both end stations as well as transmitters and receivers and compar... | 02/23/1982 |
| 4295175 | Pilot wire relay protection system for electrical distribution networks A pilot wire relay protection system for detecting and responding to phase-to-phase, three-phase, phase-to-phase to ground, and ground current faults including relatively low level ground current faults occurring within an electrical power network is disc... | 10/13/1981 |
| 4173774 | Parallel AC electrical system with differential protection immune to high current through faults In systems, such as aircraft electric power generation systems, three phase AC generators are often operated in parallel when supplying power to load busses and differential protection networks are utilized in each phase of each generator for detecting cu... | 11/06/1979 |
| 4164773 | Transfer trip circuit with pilot wire monitoring A transfer trip circuit has a first station which contains a circuit breaker and a source of control current in which the control current is increased from a first value to a second value in response to the operation of the circuit breaker. A second stati... | 08/14/1979 |
