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8150557 Method and system for reducing feeder circuit loss using demand response  
A system and method that analyzes at least one aspect of the power grid for demand response in order to reduce feeder circuit losses is provided. The system and method may use a demand response...
8134820 Contactor control circuit  
A contactor control circuit is disclosed for controlling a contactor connecting an alternating current electrical power source to a load. The contactor control circuit comprises a switching circuit...
7970650 POS device  
A POS device includes a rotation shaft vertically fixed, a rotary plate provided so as to be rotatable about the rotation shaft, a rotating portion placed on the rotary plate and having at least a...
7875822 Ablative-based multiphase current interrupter  
A multiphase current interrupter is provided for interrupting a phase current between two contacts in an electrical phase. The current interrupter includes a first ablative chamber disposed around...
7778738 Method and system for reducing feeder circuit loss using demand response  
A system and method that analyzes at least one aspect of the power grid for demand response in order to reduce feeder circuit losses is provided. The system and method may use a demand response...
7660083 Electromechanical and solid-state AC relay with reduced arcing  
An electromechanical/solid-state AC relay has an electromechanical winding coil that moves an armature to force mechanical contacts to open or close. Electrical arcing across the mechanical...
7542250 Micro-electromechanical system based electric motor starter  
A motor starter is provided. The motor starter includes micro-electromechanical system switching circuitry. The system may further include solid state switching circuitry coupled in a parallel...
6687100 Method of dissipating energy from a contactor coil  
A method of rapidly dissipating energy from a contactor controlled by a switching device, the steps comprising: operably connecting a metal oxide varistor to the switching device; interrupting...
6466420 High voltage disconnector having a moving contact that is moved at high speed  
A high voltage electrical disconnector that has a moving contact that moves at high speed comprises a moving first contact which is mounted to move along an axial direction relative to a fixed...
6075684 Method and arrangement for direct current circuit interruption  
In the direct current circuit interruption arrangements disclosed in the specification, a solid state circuit interrupter interrupts the connection in a circuit path between a power source and a...
5854729 Power system device and method for actively interrupting fault current before reaching peak magnitude  
A device/method for actively interrupting fault current in an ac or dc power system before the fault current is capable of growing to peak magnitude or steady state condition, respectively, is...
5703743 Two terminal active arc suppressor  
The arc suppression circuit includes an insulated gate bipolar junction transistor (IGBT) connected across the electrical switch contacts to be protected. When the contacts open, the combination of...
5517378 Direct-current breaker for high power for connection into a direct-current carrying high-voltage line  
A high power d.c. breaker for connection into a d.c. carrying high-voltage line (L), has two normally closed and electrically series-connected mechanical breaks (BSI, BSII) adapted to be traversed...
5502609 Electric circuitry for preventing contactor tip contamination in dry switching applications  
A contactor control system for a DC electric power system for reducing contactor tip contamination from dry-switching includes a first switch connected in circuit between a power source and a...
5452170 Commutation type DC breaker  
A commutation type DC breaker having a commutation circuit electrically connected in parallel to a main contact. The main contact is connected between a DC power supply and a load. The commutation...
5402297 Commutating type DC circuit breaker arrangement  
A commutating type DC circuit breaker arrangement comprising: a vacuum circuit breaker having a movable electrode and stationary electrode; a series circuit of a capacitor, a saturation reactor and...
5214557 D.C. vacuum circuit breaker for an electric motor vehicle  
A vacuum circuit breaker particularly suitable for use in an electric motor vehicle. The circuit breaker includes a vacuum interrupter to which a voltage is applied, the series combination of a...
4805062 DC circuit breaker and method of commutation thereof  
A DC circuit breaker and a method of commutation during a commutation capacitor capable of being directly charged from a main DC line are disclosed. A breaker unit is inserted in a main DC line and...
4740858 Zero-current arc-suppression dc circuit breaker  
A zero-current arc-suppression circuit breaker arrangement having a series circuit including a capacitor power source previously charged and a switch connected in parallel with a series circuit...
4618905 DC circuit breaker  
A line voltage charging type DC circuit breaker for use in DC transmission, having a series circuit connected in parallel with a commutation breaker, the series circuit being constituted by a...
4578730 High-voltage DC circuit breaker apparatus  
There is disclosed a high-voltage DC circuit breaker apparatus with reverse current insertion system by line voltage charge, which comprises a commutation switch, a series circuit of a capacitor, a...
4544978 Circuit for the arcless de-energization of a direct current load  
A circuit for the arcless de-energization of a direct current load receiving direct current from a rectified alternating current source. The circuit includes a means for rectifying alternating...
4449162 Drive circuit  
A drive circuit for an electromagnetic device includes an inductor which can be connected across a pair of supply lines by way of a first switch. Energy is stored in the core of the inductor which...
4442469 DC Circuit breaker apparatus  
A DC circuit breaker apparatus comprises a first interrupter and a second interrupter connected in series. A first capacitor and a discharge gap are respectively connected in parallel with the...
4356525 Method and circuit for controlling a hybrid contactor  
A method and circuit for minimizing DC current offset generated by the voltage-integrating property of an inductive load. First, second and third hybrid contactors connect first, second, and third...
4346420 Magnetoplasmadynamic switch  
A magnetoplasmadynamic switch adapted to be coupled in parallel with an ictive energy storage circuit carrying current through an initially closed circuit interrupter. The switch includes an...
4319296 Series connected oscillating transverse field interrupter and method  
The invention provides a technique for interrupting current employing a plurality of series connected vacuum arcs in parallel with a resonating circuit. At least one of the series vacuum arcs is...
4307428 Circuit breaker apparatus for high voltage direct currents  
A circuit breaker apparatus of high voltage direct currents is connected in series with an external circuit comprising an AC-DC converting device connected to an AC power supply and a DC reactor...
4305107 DC Interrupting apparatus  
A DC interrupter unit as provided between a DC power source unit and a load unit. The DC interrupter unit includes a DC interrupter section having at least one interrupter to interrupt a DC current...
4300181 Commutation circuit for an HVDC circuit breaker  
A commutation circuit for a high voltage DC circuit breaker incorporates a resistor capacitor combination and a charging circuit connected to the main breaker, such that a commutating capacitor is...
4287436 Electrical circuit for driving an inductive load  
An electrical circuit for driving an inductive load includes an output transistor of one conductivity type and a detector transistor of the other conductivity type. The output transistor has an...
4249223 High voltage DC contactor with solid state arc quenching  
An arc quenching circuit senses initiation of an arc across the contacts of a contactor, commutates a capacitor discharge to the contacts that brings the contact voltage to zero for arc extinction...
4216513 D.C. Circuit breaker  
A capacitor and an inductance are connected in parallel with an interruptor disposed in a d-c circuit before the interruptor is mechanically opened. An oscillating current io occurs in a circuit...
4172268 Direct current circuit interrupting apparatus  
A direct current circuit interrupting apparatus of the type wherein the arc of the circuit interruptor is extinguished by passing an oscillatory current from an oscillating circuit to the...
4110806 Circuit interrupting apparatus for use in direct current circuits  
Circuit interrupting apparatus for interrupting large direct currents comprising a plurality of parallelly connected branch circuits each including a circuit breaker and a saturable reactor...
4056836 Method and apparatus for interrupting large current  
Large current is interrupted against high voltage by a high speed mechanical opening line switch connected in series with a saturable reactor. A commutation capacitor is discharged through the...
4036199 Device for protecting an ignition device for motor vehicles  
A device for protecting an ignition device, particularly for motor vehicles, equipped with an internal combustion engine, in which a zener diode controls, by means of at least two transistors the...
3949239 Circuit for actuating a monostable or bistable inductive device  
This relates to an ac circuit for actuating a monostable or bistable inductive device in response to the opening of a normally closed switch. A capacitor is provided in series with the parallel...
3868550 Circuit breaker  
The circuit breaker interrupts current against a high voltage source by opening an in-line switch and causing termination of conduction therethrough by discharging a parallel capacitor to produce a...
3818311 PROTECTIVE CIRCUIT FOR SEMI-CONDUCTOR SWITCH  
A clamp circuit for the protection of a semiconductor switch. The circuit has particular value in a stored energy inverter. The energy which is not delivered to the secondary winding would normally...
3796891 CIRCUIT ARRANGEMENT FOR THE INTERRUPTION OF CURRENT  
A circuit arrangement for current limiting interruption of current at high voltage includes a plurality of series connected individual commutation stages. Each stage has an energy dissipating...
3753042 APPARATUS FOR THE CURRENT LIMITING INTERRUPTION OF CURRENTS AT HIGH VOLTAGES  
An improved circuit for the current limiting interruption of currents in a power main at high voltages of the type wherein an energy absorbing circuit and a capacitor are each connected across the...
3746927 CIRCUIT FOR SWITCHING CURRENTS THROUGH INDUCTIVE LOADS  
A circuit for switching current through an inductive load including a source of potential applying a current to a load having an inductive component, a switch for switching said load from a first...
3731149 ARC SUPPRESSION, MOTOR PROTECTION AND DYNAMIC BRAKING NETWORK FOR A.C. MOTORS  
Arc suppression, motor protection, and dynamic braking network for A.C. motors. Rectifying means are used to provide positive polarity half-cycle power or interrupted pulsating current to one side...
3708718 ELECTRICAL SWITCHING DEVICE  
An electronic switch is connected in series circuit arrangement with a capacitor. The series circuit arrangement is connected in parallel with a vacuum switch. A control circuit coupled between the...
3633069 ALTERNATING CURRENT CIRCUIT-INTERRUPTING SYSTEM COMPRISING A RECTIFIER SHUNT PATH  
A medium- or high-voltage switching system for AC current comprising two series-connected switches substantially simultaneously opened by random operated opening means. The first switch is shunted...
3562585 ELECTROGASDYNAMIC SYSTEMS ADAPTED FOR CIRCUIT BREAKING AND OTHER PURPOSES  
An electrogasdynamic tube is coupled in parallel with a switch for interrupting high voltage direct current. In course of opening the switch, a flow of ionized fluid in the tube conducts current to...
3548256 HIGH VOLTAGE D-C CIRCUIT BREAKER  
3544843 HIGH-VOLTAGE DIRECT CURRENT CIRCUIT INTERRUPTER  
3499220 METHOD OF AND APPARATUS FOR MAKING A FLEXIBLE,PRINTED ELECTRICAL CIRCUIT  
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