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| Number | Title | Issue Date |
| 7450362 | Method and apparatus for disconnection of a fault current which has occurred in an AC power supply system A method and an apparatus are disclosed for disconnection of a fault current which has occurred in an AC power supply system. A disconnection command which is produced in a protective device is supplied to a synchronization controller in order to open a circuit brea... | 11/11/2008 |
| 7352545 | Compressor terminal fault interruption method and apparatus A compressor terminal fault interruption method and interrupter for disconnecting power to a compressor terminal when terminal venting failure is imminent including a current sensing circuit for sensing current provided to the terminal by a power source and outputti... | 04/01/2008 |
| 7332894 | Power generation apparatus using AC energization synchronous generator and method of controlling the same In a power generation apparatus equipped with an AC energization synchronous generator, when energization of a secondary winding starts to conduct connecting to the network of the AC energization synchronous generator to a network voltage, energization of the second... | 02/19/2008 |
| 7301743 | Device and a method for advanced protection from short circuit current A two channel universal device for advanced protection from a short circuit current which evaluates a rate-of-change of current in a supply feeder and compares the current in the supply feeder and the current in load phases generating a differential signal in such a... | 11/27/2007 |
| 7282893 | Method and apparatus for generator control A generator control circuit is provided that includes a first circuit (44) monitoring a generator voltage change rate and producing a first output when the voltage change rate is above a first level, a second circuit (48) monitoring a generator current... | 10/16/2007 |
| 7253637 | Arc fault circuit interrupter system In order to determine whether arcing is present in an electrical circuit, a sensor signal corresponding to current in said electrical circuit is processed. The sensor signal is filtered to determine the presence of noise in a predetermined frequency range and produc... | 08/07/2007 |
| 7233463 | Method and apparatus for detecting electrical faults and isolating power source from the electrical faults The present invention is a method and apparatus for protecting a power supply from electrical faults. The present invention operates substantially independently of the current drawn by the load. In addition, the present invention includes a time delay circuitry for ... | 06/19/2007 |
| 7170262 | Variable frequency power system and method of use A variable frequency power system with a power source having a rotating output and a speed control to regulate rotational speed of the rotating output. A generator coupled to and driven by the rotating output of the power source, whereby the speed control of the pow... | 01/30/2007 |
| 7151656 | Arc fault circuit interrupter system A system for determining whether arcing is present in an electrical circuit in response to a sensor signal corresponding to current in the circuit includes a circuit for analyzing the sensor signal to determine the presence of broadband noise in a predetermined rang... | 12/19/2006 |
| 7152173 | Method and control apparatus for controlling startup of multiple IDEHDDs The present invention provides a method and a control apparatus (1) for sequentially controlling the spinning up of a number of IDE_HDDs (30) included in one computer or network server. The method and apparatus works by assigning different ID numbers t... | 12/19/2006 |
| 7136265 | Load recognition and series arc detection using bandpass filter signatures A method and system for determining whether arcing is present in an electrical circuit includes sensing a change in an alternating current in the circuit and developing a corresponding input signal, analyzing the input signal to determine the presence of broadband n... | 11/14/2006 |
| 7117105 | Method and apparatus for ground fault protection A method and apparatus for monitoring a centrally controlled power distribution system is provided. The method includes sampling an electrical current flow in the centrally controlled power distribution system, transmitting the sampled current signals to a central c... | 10/03/2006 |
| 7085662 | Power quality indicator There is provided a method and a power quality indicator coupled to an electrical circuit. The indicator comprises the summing device configured to received a sensed wave form from the electrical circuit, including at least one voltage wave form. A summing device is... | 08/01/2006 |
| 7068480 | Arc detection using load recognition, harmonic content and broadband noise A method of determining whether arcing is present in an electrical circuit includes sensing a change in current in the circuit and developing a corresponding input signal, analyzing the input signal to determine the presence of broadband noise in a predetermined ran... | 06/27/2006 |
| 7045913 | Microturbine engine system A microturbine engine that includes a compressor that is operable to provide a flow of compressed air. The compressed air flows through a recuperator where it is preheated before delivery to a combustor. The preheated compressed air mixes with a fuel and is combuste... | 05/16/2006 |
| 7023196 | High level arc fault detector Apparatus and methods for detecting high level arc faults in aircraft power systems are disclosed. One embodiment of the invention with reduced susceptibility to nuisance trips includes three low pass filters each having an output connected to a threshold detector. ... | 04/04/2006 |
| 6998782 | Circuit for generating a process-independent current Based, in part, on an input video signal, an autobias circuit generates red, green, and blue channel video signals, which are received by external drivers to drive cathodes in a CRT. The autobias circuit also provides gain and bias control signals based on a sense c... | 02/14/2006 |
| 6936996 | Control apparatus for electrical generator of vehicle In a vehicle generator control which detects an abnormal operating condition of a generator of a vehicle, and includes a transistor which drives a charging lamp to emit a warning indication when such a condition is detected, with the value of a quantity indicative o... | 08/30/2005 |
| 6927563 | Method and device for current value determination using a current transformer which operates in the core saturation region The invention relates to a method for determining a value of a current using a current transformer that operates in the core saturation region. A peak value detector determines a peak value of one half-cycle of the secondary current. The peak value is stored in a st... | 08/09/2005 |
| 6654216 | Distributed monitoring and protection system for a distributed power network A distributed monitoring and protection system for a distributed power network. The system includes a plurality of high-speed measuring units (MUs), wherein each MU is coupled to a power line to measure values of electrical parameters of the power line. E... | 11/25/2003 |
| 6633474 | Selective electronic tripping element The instantaneous tripping threshold of the selective tripping device is a decreasing function of a quantity representative of the time necessary for the current to reach the peak value. The variation curve is disposed between first and second curves, obt... | 10/14/2003 |
| 5627717 | Electronic processing unit, and circuit breaker including such a unit Digital processing of current signals allows close matching of arbitrary time delay curves for a circuit breaker. An analog signal proportional to the current is sampled and digitized. Digital samples, with or without further processing, are used to selec... | 05/06/1997 |
| 5546265 | Digital circuit interrupter shunt trip control circuit An integrated circuit breaker is described having shunt trip capability along with automatic overcurrent protection. The shunt trip unit provides auxiliary power to the trip unit and allows the trip unit to report and record the shunt trip operation. A co... | 08/13/1996 |
| 5467248 | Relay control circuit A relay control circuit in which a capacitor is used as a power source of a transistor which prohibits operation of the transistor which is operated by input by switch operation. If power is no longer supplied to the entire relay control circuit while the... | 11/14/1995 |
| 5390068 | Microprocessor based integrated generator set controller apparatus and method An electrical generator system integrated controller device utilizing PID control and capable of regulating voltage or current, and frequency simultaneously. The device utilizes a micro-controller (30.1) to monitor the engine generator set (20), then dete... | 02/14/1995 |
| 5241444 | Adaptive trip fault current indicator The disclosed fault indicator which senses current in a cable, resets in response to a minimum current and arms a trip arrangement in response to current rising a predetermined amount with respect to time. If the rising current also opens a circuit breake... | 08/31/1993 |
| 5224006 | Electronic circuit breaker with protection against sputtering arc faults and ground faults A circuit breaker bandwidth limits a sensed rate of change of current, di/dt, in the neutral conductor of a protected electrical system and fullwave rectifies the bandwidth limited di/dt signal for comparison with an instantaneous trip reference signal. T... | 06/29/1993 |
| 5191501 | Fast lamp current limiting apparatus and method A sensitive and fast low voltage lamp system controller to provide safe operation of "bare wire" systems that are particularly attractive for use in exhibition and tradeshow booth lighting. The high sensitivity is achieved by emphasizing high frequency no... | 03/02/1993 |
| 5165107 | Electronic delay timer and alarm system A time delay and alarm system is provided to ensure safe operation of periodically activated apparatus having potentially dangerous moving parts. The system preferably employs a 555 type integrated timer circuit, a horn, and a pulse generator which causes... | 11/17/1992 |
| 5029039 | Current adaptive fault indicator A fault indicator which senses current in a cable, resets in response to a minimum current and arms a trip arrangement in response to current rising a predetermined amount with respect to time. If the rising current also opens a circuit breaker within a p... | 07/02/1991 |
| 4962439 | Squaring circuit A squaring circuit and an i2 t circuit utilizing the squaring circuit. The squaring circuit comprises a voltage-controlled oscillator and a frequency/current converter which are connected to one another, with the input voltage signal being supp... | 10/09/1990 |
| 4949214 | Trip delay override for electrical circuit breakers An automatic override circuit is responsive to the magnitude of instantaneous current flow through a monitored conductor to produce an output signal which can actuate a solenoid or a ground fault interrupter to automatically trip a circuit breaker in reps... | 08/14/1990 |
| 4943888 | Electronic circuit breaker using digital circuitry having instantaneous trip capability Instantaneous trip capability is provided to an electronic circuit breaker, which is of the type that generates trip signals by accumulating squares of power line current samples and thresholds the accumulation results. Samples of power line current are t... | 07/24/1990 |
| 4914541 | Solid-state trip device comprising an instantaneous tripping circuit independent from the supply voltage In a system-powered solid-state trip device, the measurement voltage Vm, representative of the current flowing in the conductor to be protected and applied to the input of an electronic processing unit, can also be applied to the cathode of a thyristor co... | 04/03/1990 |
| 4897756 | Add-on ground fault module An add on ground fault detection system including a module readily connected to the distribution line and to the associated circuit breaker, and including circuit means for sensing a metering signal while providing a low resistance burden to summing trans... | 01/30/1990 |
| 4862308 | Power bus fault detection and protection system A power bus fault detector for detecting faults in a predefined portion of an electrical power bus having at least one phase. Power feed lines are coupled to the predefined portion of the power bus by circuit breakers. Current transformers are used to det... | 08/29/1989 |
| 4825330 | Ultra-fast solid state power interrupter A power interrupter for non-destructively protecting for instance 120 Vac equipment test when that equipment is likely (i.e., expected or designed) to develop a short circuit across the ac power line. The speed of response (50-microsecond turn-off) is sig... | 04/25/1989 |
| 4812943 | Current fault protection system An overcurrent protection system (10) for a power supply is disclosed. The system monitors the instantaneous flow of current between a power supply (12) and an electrical load (16) to detect when the flow of current exceeds a maximum rated amount. A count... | 03/14/1989 |
| 4794485 | Voltage surge protector A device for suppressing transient surges in electrical power available from an electrical outlet is disclosed. The device is adapted for mounting on a back side portion of the electrical outlet. Surge protection components, such as planar varistors are d... | 12/27/1988 |
| 4722024 | Device for detecting excess-current in a direct-current generator with controlled rectifier The apparatus relates to an excess-current monitoring device in a direct-current generator having a controlled rectifier, and is particularly useful for electro-chemical machining. A reference signal is generated by a signal generator in accordance with t... | 01/26/1988 |
