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6222714 |
Microprocessor based setting group controller for protective relay operations
A substation for distributing electric power includes protective relays whose trip points are made to be a function of temperature, the protective relays being used to control the opening and...
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6219623 |
Anti-islanding method and apparatus for distributed power generation
The invention in the simplest form is a method and apparatus for reliably protecting against island situations with one or multiple power sources connected to an electric distribution grid. The...
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6198613 |
Method and apparatus for distributing alternating electrical current to motors via a direct current bus
A method and apparatus for distributing alternating electrical current to motors via a direct current bus is provided. The method and apparatus is directed towards a system wherein a plurality of...
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6195242 |
Method and system to deter theft of cable television service
A method and system to deter cable television (CATV) service theft is disclosed. The method includes identifying a critical area along the service line of the service installation susceptible to...
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6169337 |
Power supplying apparatus for a vehicle and an intensive wiring apparatus
The electric power breaker for breaking the electric power is placed on the midpoint of the electric power line from the battery power supply, and the electric power line is extracted from the...
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6163082 |
Power supplying apparatus for a vehicle and an intensive wiring apparatus
The electric power breaker for breaking the electric power is placed on the midpoint of the electric power line from the battery power supply, and the electric power line is extracted from the...
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6160696 |
Modular bus bar and switch assembly for traction inverter
An electrical power system includes an inverter having a plurality of insulated gate bipolar transistors (IGBTs) and capacitors for converting DC power to AC power and at least one power bus bar...
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6160690 |
Distribution control system and distribution control method capable of isolating fault section without fail
A distribution control system that can isolate a fault section without fail, even if control of load break switches becomes impossible because of a communication error between a control center and...
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6147845 |
System interconnection device and method of designing same
A system interconnection device connected between two systems, such as a commercial bus line carrying power from a commercial power line and a private bus line carrying power from a private power...
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6141196 |
Method and apparatus for compensation of phasor estimations
A method for obtaining a power system phasor includes sampling a power system signal at instants determined by a nominal power system frequency to provide a plurality of data samples; using the...
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6141192 |
Arcing fault protection system for a switchgear enclosure
An arcing fault protection system for a switchgear enclosure includes a switching device for rapidly diverting current from the source bus of an electrical distribution system in response to the...
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6127741 |
Vehicular use power feed apparatus
A vehicular use power feed apparatus comprising a battery and a plurality of power distribution units connected in a loop via power feed lines. Each power distribution unit has a current monitoring...
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6101075 |
System for improving protective relay coordination with other protective elements in power system
The system first identifies the existence of a fault involving ground using the phase angle difference between negative sequence and zero sequence current on the power line. Phase angle differences...
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6084758 |
Power distribution system with circuit breakers remotely resettable by signals transmitted over the power lines
Circuit breakers in an electric power distribution system, such as in a residence or a light commercial facility, are remotely reclosed using a power line communications system such as an X10 or...
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6037857 |
Serial data isolator industrial control system providing intrinsically safe operation
Low voltage logic circuitry is used to permit an entire subsystem of an industrial controller to be placed within a hazardous environment to receive a high speed serial link and undertake the...
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6034861 |
Four-pole to three-pole bussing for a network protector
A network protector system is provided in which the internal bussing of the network protector enclosure is constructed to adapt a four-pole circuit breaker for a three-pole network protection...
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6023399 |
Decentralized control system and shutdown control apparatus
In a decentralized control system configuring a network between plural field devices for measuring and controlling the controlled objects and plural upper-level apparatus for communicating data to...
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6005759 |
Method and system for monitoring and controlling an electrical distribution network
A system for monitoring and controlling an electrical distribution network comprises an electrical distribution substation having a local area network (LAN), a feeder subsystem and a gateway. The...
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5982595 |
Redundant communications in a protective relay
A redundant communications scheme for a protective relay which allows high-speed, reliable, and fault tolerant communications between peer protective devices in a power distribution network....
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5956220 |
Adaptive distance protection system
An adaptive distance relaying system provides improved performance for parallel circuit distance protection. The system utilizes the parallel circuit's current, when available, in conjunction with...
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5943202 |
Two way packet radio including smart data buffer and packet rate conversion
Intrinsically compressed device coded data is sent in radio packets with end use programs expanding the coded data for other purposes. Intelligent electronic devices are physically combined with...
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5940260 |
Apparatus and method for distributing electrical power
The present invention relates to an apparatus and method for distributing electrical power from power substation circuits. The apparatus of the present invention is responsive to overcurrent...
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5933308 |
Arcing fault protection system for a switchgear enclosure
An arcing fault protection system for a switchgear enclosure includes a grounding device for rapidly grounding the source bus of an electrical distribution system in response to the detection of...
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5895988 |
Safety system for an electronic device having multiple power inputs
A safety system for electronic devices having multiple power inputs includes dedicating a different power detector to each power input and includes disabling all of the power inputs upon detection...
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5892645 |
Protection system for power receiving station
A protection apparatus for a spot network substation has a plurality of receiving lines connected between a network bus and a plurality of power sources. Each receiving line is connected to a...
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5886861 |
Apparatus providing response to arc faults in a power distribution cable protected by cable limiters
An arc fault detector turns on an electronic switch connecting a power distribution cable to ground thereby actuating a cable limiter to isolate the power distribution cable in response to an arc...
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5835319 |
Method and apparatus for circuit breaking
A junction box architecture includes a main circuit breaker, plurality of branch circuit breakers, and an arc detection unit. The main circuit breaker input is connected to main power supply lines,...
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5818673 |
Electric power distribution system having fault bypass feature
An electric power distribution system is shown where even if supply of electric power is interrupted, other normal electric part systems can be operated. A number of electric power distribution...
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5784238 |
Coordinated cluster tool energy delivery system
A coordinated cluster-tool energy distribution system provides a systems level approach to supplying all process energy needs for such industrial applications as those found in the semiconductor...
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5784237 |
Control method and apparatus for power distribution network
A control method and apparatus is provided for isolating network faults via the communication between neighboring network locations and the control of sectionalizing switches at the network...
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5773980 |
One-terminal fault location system that corrects for fault resistance effects
A one-terminal process for locating a fault associated with a multi-phase electric power transmission system is disclosed. The process is based on the principle that the impedance in a fault can be...
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5754382 |
Gas insulated switchgear and power transmission system using the switchgear
A power transmission system includes a transmission line unit for three phases connected to three gas insulated transmission lines and a standby transmission line unit for a phase connected to a...
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5737166 |
Protective equipment in a bipolar HVDC station
Protective equipment in a bipole converter station of an installation for power transmission by means of a high voltage direct current having main circuits on the dc side of the station. The main...
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5719787 |
Method for on-line dynamic contingency screening of electric power systems
A method for on-line dynamic contingency screening of electric power systems employs a sequence of contingency classifiers which are based on a method for finding the controlling unstable...
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5712756 |
Substation with surge arresters
A substation includes standard arresters installed near a bushing of a power transmission line entrance and at a connecting bus of a transformer and one or more high voltage arresters having a...
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5708551 |
Electrical distribution device with preventive checking of the state of the load, particularly for civil and industrial users
An electrical distribution device with preventive checking of the state of the load, particularly for civil and industrial users, having a plurality of electrical tapping outlets which are mutually...
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5706158 |
Method for short-circuit current limiting on an electrical power transmission line and configuration for short-circuit limiting
In order to obtain an improved operating behavior in the event of short circuits on a high-voltage line having a phase shifter, the phase shifter is used as a current limiter in the event of a...
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5689397 |
Arrangement for disconnecting branches of a low voltage supply network under short circuit conditions
A single circuit-breaker is provided in the phase conductor, and the bridging circuit is provided on the load side of the single circuit-breaker, and a magnetically driven switching contact closes...
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5666256 |
Electrical power distribution system apparatus-resident personality memory module
An electrical apparatus (100) line actuator (102), such as a voltage regulator or circuit breaker, has resident therein a personality module, electronically reconfigurable memory device (126) which...
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5654859 |
Fault tolerant power distribution system
A power distribution circuit is provided that isolates both power source and load faults. In one embodiment, the power distribution circuit includes two power MOSFETs connected with the channels of...
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5638244 |
Apparatus and methods for generating uninterruptible AC power signals
A broadband communications network having an uninterruptible power supply. The power supply has one input connected to AC line voltage and another input connected to a gas powered electrical...
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5631795 |
Line fault monitoring apparatus
The present invention relates to a line fault monitor for detecting a short circuit in a terminal-side loop line and disconnecting the short-circuit portion from a power supply, so that the...
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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...
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5581132 |
Peak demand limiter and sequencer
An electrical control system for sensing instantaneous total electrical power consumption being delivered into a facility and for interrupting selected electrical current consuming loads within the...
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5579195 |
Power stoppage minimizing systems for distribution lines and methods of using a distribution line
A power stoppage minimizing system for a distribution line and a method of using a distribution line minimize a power stoppage section and a power stoppage time when a short circuit occurs in the...
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5483462 |
On-line method for determining power system transient stability
A fast and reliable method for determining power system transient stability is presented for on-line power system dynamic security assessment. This method is based on the direct (Lyapunov theory)...
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5479315 |
Protective relay for power systems capable of being tested with low-level voltage and current signals
The relay includes an input module capable of receiving 70 volt and 5 amp signals, respectively, from conventional instrument transformers, which are responsive to power line signals at their...
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5467241 |
Power receiving system
In a power receiving system, a network transformer, a protector breaker and a current detector are connected between the load side of each of a plurality of network lines and a network bus, a...
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5440441 |
Apparatus for protecting, monitoring, and managing an AC/DC electrical line or a telecommunication line using a microprocessor
A NO-BLO-FUSE comprising a current sensing device is used to generate a voltage drop proportional to the current flowing through the device. When the voltage drop reaches a predetermined level,...
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5428494 |
Power line protector, monitor and management system
A micro computer based power line protection, monitoring and management system that manages one or more source(s) and one or more user(s) of the power. Further disclosed are many means of rendering...
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