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| Number | Title | Issue Date |
| 7414819 | Methods and systems for sectionalizing a looped distribution line in a power distribution system A plurality of preprogrammed switches is disposed in a looped distribution line downstream from a source of power to respond to a short circuit and to reconfigure the line to isolate the short circuit. Some of the preprogrammed switches are each provided with a uniq... | 08/19/2008 |
| 7403837 | Portable device used to at least visualize the process data of a machine, a robot or a technical process A portable device (1) with at least one optical output device (2) for displaying at least process data of a machine, a robot or a technical process, with at least one input device (3) for at least intervening in the operating functions of the de... | 07/22/2008 |
| 7369389 | Electronic trip unit for circuit breakers An electronic trip unit for a circuit breaker is disclosed. The electronic trip unit has a processing circuit, a real time clock chip, and a power source for powering the real time clock chip in the absence of current in the circuit breaker. The processing circuit i... | 05/06/2008 |
| 7304829 | Apparatus and method for filtering current sensor output signals An electronic filter for filtering the output signal of a current sensor of a circuit breaker is disclosed. The current sensor has an output signal characteristic similar to that of a Rogowski coil output signal characteristic that includes a third harmonic noise co... | 12/04/2007 |
| 7301742 | Method and apparatus for accessing and activating accessory functions of electronic circuit breakers An electronic trip unit for a circuit breaker includes a programmed microprocessor and a module plug in removable signal communication with the microprocessor. The module plug includes a program identifier. The microprocessor recognizes the program identifier and ac... | 11/27/2007 |
| 7265516 | Linear electric motor controller and system for providing linear control The invention relates to a method of, and system for, linear speed control for an electric motor, in which a digital to analog converter means is used for converting an 8-bit digital signal to an analog voltage for setting voltage across a motor, a digital state mac... | 09/04/2007 |
| 7075767 | Fault current limiting system and method A fault current limiting system includes switching means for providing a fast switching operation; a parallel current path comprising a limiting fuse; and a switching system to automatically replace a blown set of fuses with an unblown set of fuses after a fault cur... | 07/11/2006 |
| 7068483 | Circuit breaker lockout A circuit breaker lockout device is provided that prevents the breaker contacts from being closed when the circuit breaker is in a lockout state in response to a lockout signal and permits the breaker contacts to be closed when the circuit breaker is an enable state... | 06/27/2006 |
| 7035165 | Imaging near-borehole structure using directional acoustic-wave measurement Directional acoustic measurements made in the borehole are used for imaging a near-borehole geological formation structure and determination of its orientation. Four-component cross-dipole data set measured in a deviated borehole in combination with the directionali... | 04/25/2006 |
| 6934187 | Programmable soft-start control for charge pump A programmable soft-start control circuit having two memory registers for regulating the ramp-up time period of charging current in a charge pump of an integrated circuit. The two memory registers are programmed to provide two different soft-start settings for two d... | 08/23/2005 |
| 6917856 | Robot It is constructed so as to detect a joint movement position of a robot arm by a position detector and a joint movement speed is calculated from change amounts of the joint movement position and elapsed time and is compared with an allowable movement speed and unlock... | 07/12/2005 |
| 6735533 | Only picked up phases recloser control A recloser trips on one phase for single-phase only fault conditions, two phases for two-phase fault conditions, or all three phases for three-phase fault conditions. During power delivery, the recloser monitors the three phases of a power line (e.g., phases A, B, a... | 05/11/2004 |
| 6735534 | One or all phases recloser control A recloser trips on one phase for single-phase only fault conditions, or all phases for multi-phase fault conditions. During power delivery, the recloser monitors the three phases of a power line (e.g., phases A, B, and C). If a fault is detected on one phase, then ... | 05/11/2004 |
| 6388852 | Flicker protection circuit A power line flicker protection circuit, used to protect electronic equipment, features the following: A transformer (T1), provides power to the DC power supply (FIG. 2), and signaling to the auto reset watchdog circuit (FIG. 3) and the timer circuit (FIG... | 05/14/2002 |
| 6356806 | Method for handling a voltage drop in the control of a robot and for restarting a robot following a voltage drop A method for handling the voltage drop, at least in the control unit of a robot with a PC control is provided that minimizes the time of a plant stoppage and avoids wasteful process interruptions. The PC control has a real time operating system for the ti... | 03/12/2002 |
| 6201676 | Time delay device A hydraulic time delay device couples to a fault-sensing element in a circuit recloser. The time delay device includes a piston that has an external connection and is operable to move through a housing in the device to cause hydraulic fluid in the housing... | 03/13/2001 |
| 6100605 | Neutral bonding system for uninteruptible power supply A UPS device of universal application provides a pair of backfeed relays, which are mandated by certain countries outside the United States, controlled by an overall control circuit to perform in conjunction with the connection of neutral to system ground... | 08/08/2000 |
| 6008971 | Fault protection arrangement for electric power distribution systems A fault protection arrangement for electric power distribution systems includes a plurality of power sources connected to a distribution bus through circuit breakers and a plurality of loads connected through switches to the distribution bus, along with f... | 12/28/1999 |
| 5943203 | Electronic circuit breaker A monolithic electronic circuit breaker having an input terminal, an output terminal, and a controllable impedance connected between the input and output terminals. A current sensor generates a current magnitude signal indicative of the current flowing be... | 08/24/1999 |
| 5896302 | System and method for providing integrated reclosing of circuit breakers in a power substation The present invention provides a system and method for integrated reclosing of circuit breakers in a power substation by providing a programmable controller which is programmed to detect the opening of a circuit breaker and initiate a reclosing window dur... | 04/20/1999 |
| 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 least one relay which is energized by at least one leg of... | 03/24/1998 |
| 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 capacitor and a resistor in parallel with a reset coil. T... | 08/12/1997 |
| 5638021 | Power semiconductor component with temperature sensor A power semiconductor component assembly includes a power semiconductor component having a semiconductor body. A controllable switch is connected to the power semiconductor component. A temperature sensor has a given reset time. The temperature sensor is ... | 06/10/1997 |
| 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 the first series circuit. A control device controls an on an... | 12/17/1996 |
| 5574346 | On and off state fault detection circuit for a multi-phase brushed or brushless DC motor A fault detection circuit monitors voltage drops associated with phase windings of a brushed or brushless reversible multi-phase motor and compares them with reference voltages to determine if the motor is out of normal operating range parameters and if a... | 11/12/1996 |
| 5568342 | Apparatus and method for protecting an amplifier circuit Circuit for protection of an amplifier stage comprising circuit switching means for turn-off of the stage and piloted through a logic gate OR by a monostable, which generates upon arise of abnormal operating conditions turn-off command signals having a pr... | 10/22/1996 |
| 5319514 | Digital voltage and phase monitor for AC power line A digital voltage protection circuit (138) and a phase monitor circuit (154, 160, 162, 168) disconnect AC-powered user equipment (22,182) from the AC power supply (141) whenever the AC power line voltage is outside a predetermined operating voltage window... | 06/07/1994 |
| 4999730 | Line voltage monitor and controller A line voltage monitor and controller disconnects AC-powered user equipment from an AC power line whenever the AC power line voltage is outside a predetermined operating voltage window. The equipment is automatically reconnected to the power line only aft... | 03/12/1991 |
| 4999728 | Power surge protection circuit A circuit for protecting electronic equipment such as computers, laser printers, fax machines, and the like from damage due to electrical transients associated with a temporary power interruption is connectable between a source of A.C. power and the elect... | 03/12/1991 |
| 4994934 | Microcomputer based reclosing relay A microcomputer based reclosing relay performs a number of sequences to generate a succession of reclosure signals for a circuit breaker at timed intervals. The digital processing unit of the relay maintains flags, counts and running times for generating ... | 02/19/1991 |
| 4991049 | Anti-short-cycle circuit A protective time delay delay circuit delays energization to an electric load until a predetermined time has elapsed from a previous deenergization. A transistor has its emitter connected to an ac conductor and has its base coupled to an RC timing circuit... | 02/05/1991 |
| 4965692 | Overload detector and protection circuit An overload protection circuit for power supplies and telecommunications apparatus such as multifrequency ringing generators causes the output voltage to become zero when a current overload is detected. The voltage is kept at zero for a predetermined peri... | 10/23/1990 |
| 4912591 | Distribution line switchgear control employing a precision rectifier A distribution line switchgear control which is particularly suitable for use with recloser switchgear which requires small amounts of power from the control for operation. The control is most usefully powered for continued operation by small amounts of l... | 03/27/1990 |
| 4899247 | Auto recloser coil burn-out protection An auto-recloser for a power line has a high voltage closing coil (12) for closing the main contact (14) in the power line, the closing coil being energized via a non-latching switching (18) in turn controlled by a low voltage closing coil (20). A time cl... | 02/06/1990 |
| 4878034 | Digital protection circuit and method for linear amplifier An overload protection circuit for a disableable amplifier includes a sensing resistor connected to provide indication of the current supplied to the amplifier and includes logic circuitry for producing a disabling control signal for a selected time inter... | 10/31/1989 |
| 4860150 | Protector network for A-C equipment A power cutoff circuit is added to the protector network disclosed in U.S. Pat. No. 4,675,772 so that when an interruption in power occurs, at least one suppressor remains connected to a load even though a source is disconnected from the load. In one embo... | 08/22/1989 |
| 4853820 | Electronic circuit breaker systems Electronic circuit breakers safeguard a load connected to a power supply against damage from overload conditions. These circuit breakers interrupt flow of overload currents to the load by instantaneously reducing flow of such current from the power supply... | 08/01/1989 |
| 4788619 | Protective relays and methods Protective relay for use in an electrical power system having electrical conductors which are energizable with an AC voltage. The protective relay includes a circuit for sensing the AC voltage to produce an AC output that has zero crossings and a time per... | 11/29/1988 |
| 4761702 | CMOS latch-up recovery circuit An overcurrent shut down circuit for use in a switching regulator power supply comprised of circuitry for detecting the average current of a pulse width modulated input signal, comparing the average current with a predetermined threshold level and reducin... | 08/02/1988 |
| 4757415 | Power active filter employing positive sequence filtering A power active filter circuit for an electric power system includes a reference generator for producing a plurality of balanced, constant amplitude, positive sequence, AC reference voltages, each being phase-locked to a corresponding phase voltage of the ... | 07/12/1988 |
