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Document |
Document Title |
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8154836 |
Line current differential protection upon loss of an external time reference
A line current differential protection system that uses an external time reference continues providing protection to a power apparatus upon the loss of the external time reference. An external time...
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7864533 |
Semiconductor device
A semiconductor device includes: a first output unit configured to output a first phase; a second output unit configured to output a second phase different from the first phase, the second output...
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7846027 |
Handheld electronic devices
A handheld electronic device, the device comprising a housing and a retractable handle, the device being arranged to allow the handle to be retracted into the housing along a sliding axis to...
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7570470 |
Self-powered communications link for smart circuit breakers
A circuit breaker communication system is provided including a circuit breaker, an electronic module to record and store data associated with the operation of the circuit breaker, and a portable...
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7558038 |
Field upgradeable circuit breaker firmware and programmer therefor
A system (10) is provided for communicating with a residential electronic circuit breaker (18, 20, 22, 24). The system (10) comprises a residential electrical wiring system (16) including a power...
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7558033 |
Arc fault circuit interrupter and method of parallel and series arc fault detection
An arc fault circuit interrupter includes separable contacts, a neutral conductor, an operating mechanism structured to open and close the separable contacts, at least one current sensor structured...
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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...
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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...
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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...
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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...
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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,...
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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...
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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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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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3912979 |
Pilot wire protective relaying apparatus
The disclosed apparatus comprises a conventional pilot wire exclusively used for the operating force and a separate pilot wire exclusively used for the restraining force. At each of terminals of a...
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3796920 |
ARRANGEMENT FOR A REPEATERED POWER LINE CARRIER SYSTEM THAT PROVIDES PROTECTIVE RELAYING
In power line carrier systems, repeaters are provided at station or switchyard locations between line sections to transmit signals in both directions around the location. In some systems tones are...
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3497772 |
PILOT WIRE PROTECTIVE ARRANGEMENT FOR ALTERNATING CURRENT SYSTEM WHEREIN RELAY OPERATING AND RESTRAINT SIGNALS ARE DERIVED DURING HALF CYCLES OF OPPOSITE POLARITIES
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3588824 |
SPARE CHANNEL SYSTEM FOR SECTIONALIZING A COMMUNICATION LINE CIRCUIT
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3296495 |
Polyphase protective relay circuits
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2974257 |
Protective apparatus for power systems
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2849660 |
Protective circuit for high tension lines with series condensers
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