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7538519 Information handling system with battery protected from non-permanent failures  
In a method and system for protecting a battery being charged by an electrical device, a current flowing through a cell stack of the battery is measured. If the measured current is greater than a...
7218496 Overcurrent protection circuit  
The voltage generator circuit includes a regulator, a first sensor circuit, and a second sensor circuit. The first sensor circuit includes a first transistor, a first resistor, and an error...
7170732 Surge delay for current limiter  
A surge current delay time period is added to a current limit delay time period in order to permit a longer time for a possibly temporary larger-than-steady-state electrical current, such as for a...
6985784 Configuring a centrally controlled circuit breaker protection system  
There is provided a computer-implemented method for configuring a centralized circuit breaker protection system. The method includes determining configuration data for a processor in the...
6798630 Trip device comprising an improved man-machine interface and circuit breaker comprising such a trip device  
The electronic trip device includes a processing unit having inputs to receive electrical signals representative of electrical quantities and an output to supply a tripping signal to a tripping...
6788513 Switching power supply circuit  
A switching power supply circuit is protected from degradation and breakage of a MOS transistor when the inductive load is short-circuited or overloaded. To do this, the magnitude of the load...
6683766 DC arc detection and prevention circuit and method  
A circuit and method are disclosed for detecting an imminent arc prior to the ignition of the arc in a system having a DC power supply that provides power to a load through a conductor. The...
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...
6625551 Fault current and differential current detection system capable of preventing spurious triggering of a protection system due to transient interference pulses  
A fault or differential current detection system is provided. The detection system detects a fault or differential current generated on a conductive path supplying power to an electric device and...
6385022 Method and apparatus for deriving power system data from configurable source points  
A protective relay that derives and processes power system data from multiple user-configurable data source points. Data from multiple source points can be combined in the relay as a single source...
6324041 Protection circuit for traveling wave tubes having multiple input tones  
A protection circuit (30) for a Traveling Wave Tube having multiple tone operation. The protection circuit (30) is a dual sensor (52, 54) arrangement. One sensor (52) is an operational amplifier...
6297939 Zone selective interlock for a circuit breaker system  
A circuit breaker system 10 using electronic trip units 35. The electronic trip units 35 are coupled to a communications bus 30 whereby the electronic trip units 35 can be reconfigured, controlled,...
6279115 Circuit arrangement for monitoring of an electric tripping device for low-voltage switches  
A circuit arrangement is described for monitoring an electronic tripping device for low-voltage switches having a microprocessor device which, in conjunction with a digital-analog converter,...
6195243 Method and apparatus for adaptive configuration and control in a network of electronic circuit breakers  
A system including a load center monitor (10) connected to a plurality of digitally enhanced circuit breakers (40) by a communication bus (26) forms a network of reconfigurable circuit breakers...
6175479 Instantaneous protection device and method for a circuit breaker  
The present invention involves a power circuit breaker that conditionally and temporarily enables instantaneous trip protection. A position sensor senses whether the breaker contacts are open or...
6141197 Smart residential circuit breaker  
A circuit interrupter of the type including an electronic trip unit for overcurrent determination includes a separate circuit to power the trip unit along with a Hall Effect or GMR Device to sense...
6069780 Electronic trip device comprising, in series, finite and infinite impulse response filters  
The electronic trip device comprises in series for each phase of a power system a sampler, a squaring circuit and a finite impulse response (FIR) filter. A maximum circuit is connected to the...
6067218 Electronic trip device comprising at least one setting device  
The trip device comprises a processing unit which gives a tripping order according to the value of the current supplied by current sensors, and to threshold and time delay values defined by setting...
6018300 Fault monitoring  
5995347 Method and apparatus for multi-function electronic motor protection  
A multi-function protection system (8) for protecting electrical equipment such as a screw compressor motor is shown having a housing (10, 20) mounting current sensing toroids (CT1, CT2, CT3) and...
5943201 Method and apparatus for setting trip profiles in electrical switches using a portable unit with a non-volatile memory  
Trip profiles for electrical switches such as circuit breakers and overload relays can be generated, and when appropriate, coordinated, in a remote processor such as a personal computer. The...
5808844 Current differential protection arrangement  
A current differential protection arrangement for an electric power supply unit with a measured value pre-processing device and an analysis device that checks on the basis of a predefined...
5793595 Multi-application relay for power systems  
A microprocessor-based multifunction overcurrent relay for protecting power systems has a plurality of overcurrent elements implemented in a software program. Sufficient overcurrent elements are...
5764460 Circuit for the protection against overcurrents in power electronic devices and corresponding method  
A circuit for protecting from overload currents includes an electronic power device having at least first and second terminals and at least one control terminal. The circuit also includes at least...
5710690 Method and apparatus for protecting an integrated circuit from current overload  
A non-dissipative device for protecting an integrated circuit having multiple independent channels against overloading. The non-dissipative device includes an input terminal and an output terminal...
5657193 Electronic control module for motor controller units  
A motor controller unit that employs standard motor contactors and electronic circuit breakers includes an electronic control module (ECM) for interfacing with the contactors and circuit breakers....
5648887 Electric current limiting device for winch responsive to multiple device states  
A winch system including an electric motor is protected against an overload condition by use of a current sense device and a current limiting device. The current limiting device employs multiple...
5627718 Apparatus providing protection and metering in an ac electrical system utilizing a multi-function sampling technique  
A circuit interrupter samples waveforms in a protected circuit by taking samples in pairs spaced 90 electrical degrees apart. The sum of the squares of samples in each pair, which is representative...
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...
5627713 Protective device for electric distribution system  
A protective device for an electric distribution system capable of providing an easy inspection and confirmation of the setting for the operation characteristics of the device. The device includes...
5596473 Electrical switches with current protection interfaced with a remote station and a portable local unit  
An electrical switch with overcurrent protection communicates as a slave with a remote master station by sending return messages to the remote master station only in response to messages addressed...
5500781 Digital circuit interrupter with multiple accessory function  
An integrated circuit breaker having several accessory functions along with automatic overcurrent protection, allows selection between the various accessory functions in different combinations....
5485343 Digital circuit interrupter with battery back-up facility  
A digital circuit interrupter utilizing current transformers for operating power is provided with a re-chargeable battery to power-up the trip unit as well as to power the display after an...
5483408 Overcurrent trip unit with separately adjustable neutral protection  
A circuit interrupting device provides for operator selection of protection parameters for a neutral conductor separate from operator selected phase protection.
5452173 Diagnostic circuit protection device  
A circuit protection device for use with an electrical unit comprises driver circuitry connected to the electrical unit and connecting means electrically connecting the device to the electrical...
5452174 Power source circuit incorporating a protection device therein and a printer device employing the same  
A power source circuit is provided having a high frequency transformer 16, a switching control circuit 15 connected with the primary winding of the transformer 16, rectifier circuits 17, 18 and 20...
5384678 Control and self-monitoring system, in particular for a multipole electrical apparatus such as a high tension circuit breaker  
Control and self-monitoring system for an electrical apparatus comprising three poles, each including a closing coil and an opening coil, an opened auxiliary contact, and a closed auxiliary...
5367427 Overcurrent trip unit with indication of dependency of trip functions  
A graphical representation of the current/time trip characteristic displayed on the operator's panel of an electronic trip unit for a circuit interrupter, has different indicia, such as different...
5353188 Overcurrent detector circuit for a circuit-breaker  
An overcurrent detector circuit for a circuit-breaker includes two systems for overcurrent detection. In the first system, the level of the current detected by the current detectors 41 is converted...
5307230 Circuit breaker with protection against sputtering arc faults  
A circuit breaker includes an electronic trip device which responds to sputtering arc-type faults. Level detectors compare the current in the protected circuit to a plurality of threshold levels...
5299087 Overload protection circuit  
The overload protection circuit 12 comprises a resistor bridge 20 with a low impedance sensing resistor r and high impedance resistors R1 to R4 which generates voltages Va and Vb at the inputs 32...
5220479 Electronic trip device whose front panel is formed by a flat screen display  
The front panel of the trip device is formed by a flat screen display, for example liquid crystal, controlled by the trip device microprocessor. The display provides a permanent display of the...
5214560 Microprocessor watch-dog monitor for electronic trip units  
A microprocessor watch-dog monitor for electronic trip units includes an input transistor (Q1), a timing circuit (16), and a comparator circuit (18). The comparator circuit is formed of a first...
5208720 Electronic trip device with short delay function  
The short time delay circuit comprises a counter which is zero reset when the signal representative of the current is greater than or equal to a threshold, and controls count-down of an up-down...
5204797 Solid state overcurrent protection system for circuit breakers  
A device for detecting a primary fault current at a three phase current system and converting the detected fault current into mechanical action for breaking the circuit includes circuitry for...
5159519 Digital circuit interrupter with an improved sampling algorithm  
A digital circuit interrupter having a keypad and display for entering and viewing the trip parameters utilizes a sampling algorithm to periodically sample the current within a protected circuit....
5115371 Circuit breaker comprising an electronic trip device  
The circuit breaker comprises a thermistor located in a cold zone, near the front face of the trip device and at least one thermistor located in a hot zone, at the bottom of the circuit breaker...
5113304 Digital protective circuit breaker  
A circuit breaker includes a current detector for generator analog voltage signals in accordance with load current of respective phases and a control circuit for executing a tripping operation in...
5086366 Prealarm circuit breaker  
In a prealarm circuit breaker which can issue a prealarm signal before occurrence of trip, a pair-transistor is employed in a charging circuit of a pair of capacitors, one of which serves to make a...
5077629 Switch with pre-alarms means  
In a switch with pre-alarm means (101) having pre-alarming apparatus (20, 21) and an indicator (103) for alarming that value of current flowing on a load is above a predetermined alarming level,...
Matches 1 - 50 out of 124 1 2 3 >