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8183718 |
Method and device for controlled reclosing of a circuit breaker
A method for controlled reclosing of branch elements in an electric power system that has been subjected to a disturbance and that includes at least one branch element and at least one circuit...
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8145443 |
Fourier transform-based phasor estimation method and apparatus capable of eliminating influence of exponentially decaying DC offsets
Disclosed herein is a Fourier transform-based phasor estimation method and apparatus capable of eliminating the influence of exponentially decaying DC offsets. According to a Fourier...
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8139333 |
Short circuit protection circuit
A short circuit protection circuit which readily recovers a relay drive circuit to an output operation state after a short circuit is cancelled while preventing the relay drive circuit from being...
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8125750 |
Street furniture safety device
An electrical isolation system specifically adapted for use in street furniture (10) having an electrical supply (24) to working electrical components (20) is described. The system includes an...
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8116050 |
Semiconductor integrated circuit
To provide a semiconductor integrated circuit including: a detection circuit that detects an occurrence of latch up and can be configured while adopting a layout configuration that suppresses the...
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7961445 |
Method of detecting fault extinction during a three-phase autoreclosing cycle in an AC transmission line
A new method for three-phase reclosing of transmission lines is disclosed. According this method, after the type of fault is identified and the faulted line is opened for all three phases from both...
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7911753 |
Method and apparatus for detecting and recovering from external electrical disturbances
Apparatus and method are described, illustratively in an LVLS master/slave system, for detecting a circuit failure, shutting down the system as if a normal power down function has occurred, but...
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7889471 |
Power supply particularly for a meter-bus
A power supply providing current interruption based on the energy from the supply over a sliding window of time is disclosed. The output current from the supply is periodically reestablished.
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7876539 |
Electrical apparatus with current dampening device
Various electrical apparatuses which include a current dampening device are disclosed. In one embodiment, an electrical apparatus is provided which includes a motor and a switch having an “on” pos...
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7656628 |
Apparatus for providing fault protection in a circuit supplying power to an electronic device
Apparatus is provided to limit the current drawn from a power supply output connected to furnish power to a docking station or electronic device, when a fault connects the output to ground or other...
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7565459 |
Combination I/O modules in a modular automation controller
The invention describes combination I/O modules for automation. Various combinations of inputs and output with different electrical interfaces are offered providing greater flexibility in...
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7436290 |
Sensor discrimination apparatus, system, and method
A first and second node configured to couple to a load. A current source is adapted to drive a first current to the load through at least one of the first and second nodes. A first switch is...
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7369921 |
Power distribution expert system
A power distribution expert system is provided to determine an optimal power distribution configuration, and also to determine an optimal transition path to reach said optimal configuration. An...
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6768620 |
Adaptive reclosing method using variable dead time control algorithm in power transmission line
Disclosed in an adaptive reclosing method using a variable dead time control algorithm in a power transmission line. The method is used to remove faults induced by a circuit breaker being operated...
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6747458 |
Method for monitoring the ground potential of a rectifier drive
A method for ground potential monitoring of a rectifier drive, having a capacitor which is connected with a voltage source via a switching device. The method including applying a test voltage...
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6683768 |
Circuit topology for protecting vulnerable micro electro-mechanical system (MEMS) and electronic relay devices
The present invention discloses systems and methods for protecting electronic devices (switching and non-switching) such as micro electro-mechanical system (MEMS) devices and solid state relays due...
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6674625 |
Lightning protection systems
A lightning protection system including a monitoring system (10) for detecting dangerous atmospheric conditions within specific geographic zones, a transmission system (12) for sending control...
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6667869 |
Power control system and method for illumination array
A power control system and method controls power supplied from a power source to a resistive load, such as a LED illumination array, to prevent the load from exceeding a high temperature limit. The...
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6651036 |
RMS-to-DC converter with fault detection and recovery
A circuit that provides the root-mean-square (RMS) value of an input signal and that detects and independently recovers from an output fault condition is provided. The circuit includes...
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6539287 |
Distribution control system capable of isolating fault section without using time limited sequential shift function
A distribution control system includes in each of feeder terminal units a controller that updates a value in a latest current value storage area of a memory, every time a current value is detected...
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6532424 |
Electrical fault detection circuit with dual-mode power supply
An arcing fault protection assembly and a corresponding method determine whether arcing is present in electrical circuits. The assembly powers-up quickly without dissipating excessive heat while...
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6507470 |
Method and arrangement for shortening the recovery time of a line driver
To shorten the recovery time of a line driver (1) after an overvoltage on its output terminal (3), a current generating device (5) senses a voltage difference between the output voltage of the line...
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6424510 |
ESD structure for IC with over-voltage capability at pad in steady-state
The present invention provides an ESD structure that can tolerate voltages at the I/O pin, or pad, higher than the voltage allowed for such technology. More particularly, the present invention...
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6417579 |
Electrical system with security battery disconnection
A starter circuit for a motor vehicle includes a circuit breaker responsive to a crash senor for disconnecting the starter circuit. A bypass switch is provided, which responds to a control circuit...
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6349023 |
Power control system for illumination array
A power control system, which serves to protect a dissipative/resistive load from exceeding a predetermined temperature limit. The power control system accurately models the temperature of the load...
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6154081 |
Load circuit having extended reverse voltage protection
An improved reverse voltage protection circuit that protects sensitive electronic devices from damage due to both reversed battery connections and source voltage interruptions. An N-channel...
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6150792 |
Phase monitor
A phase monitor for a short-circuited asynchronous three-phase motor comprises a first and a second sensing unit, both of which are connected to a supply voltage line to the motor in order to sense...
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6147616 |
Automatic power interruption and re-supply relay for an electric power line
The present invention provides a digital automatic power interruption and re-supply relay for performing detection and comparing operation to inform a state of an accident with voice and numerals...
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6141195 |
Data and/or energy transmission device with a disconnecting unit
Short-circuits are liable to occur between the two conductors in a system in which data and/or energy is transmitted to a plurality of receivers/users via two conductors. Transmission is then...
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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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6115230 |
Method and apparatus for detecting arcs and controlling supply of electrical power
A method and apparatus for detecting electromagnetic noise generated by an arc and controlling a power supply that powers the arcs. In an embodiment of the invention, the apparatus includes an arc...
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6081123 |
Device for preventive detection of faults with identification of the type of load
During a first test phase, the device, after detecting the presence of a load, enables the nature of the load to be identified. For this, a control circuit connects the load to an AC main power...
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6023402 |
Software controlled fan with hardware fail-safe restart
A control circuit for the regulation of fan speed control in a computer power supply with software controlled shutdown and automatic restart for over-temperature protection. The control circuit...
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5982594 |
Intrinsically safe power source
An intrinsically safe power supply unit is provided for conditioning power supplied by a power source. An input power converter connected to the power source receives current from the power source....
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5968083 |
Active overload detection and protection circuit for implantable cardiac therapy devices
An active overload detection and protection circuit for protecting a host device (e.g., an implantable cardiac therapy device) from potential damage due to high voltage transients applied to an I/O...
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5959537 |
Variable trip fault indicator
In a power distribution system, a reliable, accurate, and energy efficient fault circuit indicator is provided through a microcomputer-based fault current indicator design. First, reliability is...
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5883578 |
Loss of potential determination for use in protective relays for electric power systems
The positive sequence voltage on the power line is measured at a given time, i.e. the present time, and also for one cycle earlier, and the ratio thereof is then compared against a threshold value...
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5835324 |
Programmable electronic fuse box having a key pad which does not require fuse elements
A electronic fuse box is provided with an input device such as a keypad with alphanumeric and data entry keys, a central processing unit made from one or more integrated circuits that is...
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5784239 |
Drive to last reclosure operation in a protective relaying system
A reclosing relay in accordance with the disclosed invention comprises a reclose initiate (RI) input and a drive to last reclosure (DTLR) input, and an output at which a close signal is provided to...
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5760499 |
Safety device for socket which is connected to electrical power supply
A safety device includes a comparator circuit includes three resistors arranged in series. An IC has a positive pole coupled to the resistors and has a negative coupled to the positive pole of...
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5748428 |
Pulse width modulation and protection circuit
A pulse width modulation circuit includes a transistor pass element alternately switched on and off by an oscillator and connecting a power source to a load. Current through the transistor pass...
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5731942 |
Load protector
The instant invention is a protection device for electrical equipment operating on a single or three phase alternating current power supplies. The device consists of an electrical circuit having at...
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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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5703744 |
Circuit substrate including anodization control means
A circuit substrate includes a plurality of semiconductor devices including electrodes, a wiring having a plurality of branched portions and mainly formed of a metal material, a terminal for...
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5657194 |
Circuit and method for automatically resetting a solid state relay
A reset circuit for an overload relay includes a timing circuit coupled to a switching circuit for automatically resetting the relay a predetermined time after a trip. The timing circuit includes a...
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5585994 |
Battery over-current protection circuit
A first series circuit of a current detector and a first switch is connected in series with a battery, and a second series circuit of a resistor and a second switch is connected in parallel with...
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5511183 |
Non-volatile memory controlling apparatus and applications of the same to electronic computer peripheral equipments
A control apparatus for a non-volatile memory and applications of the control apparatus to electronic computer peripheral equipments are disclosed. For example, a NOVRAM (non-volatile static random...
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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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5414344 |
Non-contact apparatus for sensing energization of high voltage signal line
An E-field sensing apparatus detects the energization of high voltage utility transmission and distribution lines. An external housing substantially shields internal components of the apparatus...
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5390066 |
Protection device for electrical appliances, machines and installations
User lines connected to power supply lines can be disconnected therefrom by a connect/disconnect switch. At least one resistor bridge connects the user lines and forms a connection point at a...
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