Matches 201 - 250 out of 337 < 1 2 3 4 5 6 7 >
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3944885 Electric load restriction unit  
An electric load restriction device which conserves the secondary use of electricity during a period of a power shortage by causing selected load circuit breakers to open, in response to a change...
3746938 INTERLOCK CIRCUIT  
An interlock circuit providing electric power to a transformer or other electric device in response to one or more sensed conditions interrupts such power upon the cessation of one of the sensed...
3714452 CIRCUIT BREAKER MONITOR FOR UNINTERRUPTABLE POWER SYSTEMS INCLUDING A STATIC BYPASS  
An uninterruptable power system including main apparatus for supplying power to a critical bus, the main apparatus includes electromechanical circuit breakers and a static switch. Bypass apparatus...
3697773 METHOD AND APPARATUS FOR NON-OSCILLATORY REMOVAL OF TRANSIENTS IN MINIMUM TIME BY BANG-BANG CONTROL OF REACTANCE IN A POWER SYSTEM  
In a power transmission system involving parallel tie-lines extending between a generating station and a large power grid, transients are removed, upon the opening of one tie-line, by inserting two...
3686534 FLOAT CONTROLLED CIRCUIT BREAKER MEANS  
A float controlled circuit breaker means operatively associated with an electrical cord capable of conducting electrical current to an electrically operable utilization means wherein the float...
3660721 PROTECTIVE EQUIPMENT FOR AN ALTERNATING CURRENT POWER DISTRIBUTION SYSTEM  
Protective equipment for an electric power distribution system comprising a bus, a supply circuit connected to the bus through a main circuit breaker, and feeder circuits connected to the bus...
3644787 UNDERSEA WYE CONNECTION FOR A SUBMARINE CABLE SYSTEM  
A simple and reliable diode and avalanche diode network for use at the undersea branch point of a submarine cable system having a main section and two branch sections which permit powering of the...
3567954 INTERCONNECTING MEANS FOR ELECTRIC POWER SYSTEMS  
An interconnecting means for AC electric power systems is composed of a plurality of DC excited saturable reactors located within a tie line connecting said electric power systems. These DC excited...
3551746 VOLTAGE ACCEPTOR CIRCUIT AND OVERVOLTAGE UNDERVOLTAGE DETECTOR FOR USE THEREIN  
3543045 METHOD AND APPARATUS FOR CONNECTING AND DISCONNECTING CONVERTER STATION BETWEEN TRANSMISSION LINES  
3530360 HIGH-SPEED PROTECTIVE MEANS FOR UNINTERRUPTIBLE POWER SYSTEMS  
3519883 FREQUENCY-RESPONSIVE CONTROL APPARATUS IN ELECTRIC POWER SUPPLY SYSTEMS  
3515893 METHOD OF IMPROVING THE STABILITY OF INTERCONNECTED POWER SYSTEMS  
3513352 DEVICES FOR PROTECTING THREE-PHASED ELECTRIC LINES  
3453495 REVERSE CURRENT FLOW PROTECTOR FOR ELECTRIC POWER SYSTEMS  
3423637 CONTROL OF A RELAY CHAIN CIRCUIT  
3383562 Electirical distribution system  
3315127 Restoring circuit means for isolating the defective branch and reconnecting the remaining branches  
3233151 Electrical protective systems  
3226561 Synchronizing devices between alternating current systems  
3214639 Fault clearance devices for electric power transmission and distribution polyphase feeder systems  
3156828 Protective control for paralleled alternator systems  
3121826 Phase failure protective circuit  
3113244 Ground fault responsive protective system for electric power distribution apparatus  
3059166 Arrangement for the protection of semi-conductor rectifiers connected in parallel  
3054039 Plural channel servo systems  
3045168 Electrical circuit for indicating the failure of diodes  
3045167 Detection circuit  
3026396 Busway switch  
2840725 Alternating current generator system  
2759177 Polyphase power failure indicator  
2747142 Automatic line sectionalizing and service restoration device  
2691889 Plural zone measuring bridge  
2614160 Indicating system  
2534902 Automatic switching system  
2525527 Ring main distribution protection system  
2523148 Phase balance protective relay system  
2472657 Means for disconnecting a faulted feeder circuit from a power circuit  
2471216 Low-voltage rectifier protection  
2414932 Lighting system for automobiles or the like  
2388845 Electric control system  
2376775 Electrical testing equipment  
2356373 Overload relay  
2356083 Electrical distribution system  
2354138 Electrical distribution system  
2352556 Apparatus for protecting power lines  
2341932 Protective system  
2329083 Control system  
2317552 Electrical distribution system  
2264982 Motor-control circuit for circuitbreaker closing mechanisms  
Matches 201 - 250 out of 337 < 1 2 3 4 5 6 7 >