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7209048 |
Device for monitoring and alerting of a power disruption to electrical equipment or an appliance
The present invention is a simple, inexpensive and reliable device for monitoring and alerting of a power disruption to an appliance or a piece of equipment. An audible and/or visual alarm may be...
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6909203 |
I/O interface anti-resonance passband shunting technique
A method and apparatus for regulating resonance in a computer system I/O interface is provided. A shunting impedance/resistance is arranged across a power supply of the I/O interface. The shunting...
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6784571 |
Electronic safety switching device and method
The present invention relates to an electronic safety switching device having at least a first and a second signal processing channel. The channels can be supplied with input signals for signal...
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6690565 |
Method and apparatus for neutralizing stray current impulses
The attenuation of the stray current impulse limits the capacitive leakage. The value of the inductance, coupled to the parasitic capacitance of the charge, creates a reactive filter effect. Since...
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5760499 |
Safety device for socket which is connected to electrical power supply
A safety device includes a comparator circuit includes three resistors arranged in series. An IC has a positive pole coupled to the resistors and has a negative coupled to the positive pole of...
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5321318 |
Stray current neutralizing method and device
A method and device neutralize alternating stray current flowing through a ground return circuit in the proximity of an animal susceptible to be affected by this current. The alternating stray...
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4967302 |
Safety barriers for 2-wire transmitters
A single-channel shunt-diode safety barrier for energizing a 2-wire transmitter, particularly for use in process control, incorporates within the barrier a floating d.c. power supply or its...
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4816956 |
Stray voltage reduction apparatus
Stray voltage reduction apparatus for installation in an electrical power system to complete a path of electrical continuity between a primary neutral of a power distribution transformer and a...
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4743998 |
Grounding system
An improved grounding system comprises a tube which is vertically buried under the ground and cut with a plurality of holes at its lower part, and receives a wire inside it. The wire connects at...
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4703195 |
Parallel grounding scheme
Electronic system grounding includes two system grounding paths for card cage electronic modules, with a first grounding path through the card cage and a second grounding path through the system...
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4670663 |
Guarded switches for component scanner
A test voltage is applied through an array of "guarded" switches (58) to selected ones of a plurality of components to be measured. Each switch (58) comprises first and second input terminals (69,...
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4573098 |
Ground voltage suppression
In a power supply system having a grounded neutral and supplying service equipment through a distribution transformer, a ground voltage suppression device comprises a saturating inductor or like...
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4428018 |
Low leakage filtered power supply
An AC power supply system having transformer and filter structures. The electrical center of the filter section, which is normally connected to system ground, floats with respect to system ground...
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4415775 |
Arrangement for exchanging signals between separated circuits
Arrangement for transmitting at least two signals from a first circuit arrangement to a separate second circuit arrangement. In order to realize a disturbance-independent signal transmission with a...
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4371825 |
Method of minimizing the effects of parasitic currents
A method of minimizing the effect of parasitic currents in secondary batteries having a plurality of cells connected electrically in series and a common electrolyte in communication with the cells...
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4367507 |
Apparatus for clearing faults on untransposed transmission lines using single phase switching
A switched four-legged reactor bank which operates in combination with line circuit breakers can be used to extinguish faults on untransposed transmission lines. It comprises three shunt reactors,...
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4051827 |
Selective threshold ignition circuit
A selective threshold ignition circuit adaptable for use in an electronic ignition system for an engine is disclosed. A magnetic pick-up produces an AC signal about a DC reference level which has a...
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3823248 |
BUS INCORPORATING CURRENT LIMITING REACTANCE
A bus duct run, consisting of a rigid tubular conductor supported inside a rigid enclosure, has a current limiting reactance incorporated in the conductor. The reactance is obtained from a portion...
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3793535 |
CIRCUIT FOR PROTECTING SEMICONDUCTORS AGAINST TRANSIENT VOLTAGES
A surge protector is connected in parallel across each of the line-side and load-side circuits, that on the line-side having a relatively high clipping voltage and relatively high energy handling...
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3736437 |
VACUUM SWITCH APPARATUS
A vacuum switch apparatus comprising a vacuum switch having a pair of electrodes, and a series circuit consisting of a resistor and capacitor disposed between one of said electrodes and ground to...
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3710363 |
SIGNAL TRANSMISSION SYSTEM
Noises are generated in signal lines connecting an electronic circuit in the digital controller with a limit switch and a relay in the controlled machine and these noises cause the electronic...
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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...
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3691460 |
APPARATUS FOR THE NOISE-COMPENSATED MEASUREMENT OF HIGH D.C. CURRENTS
The invention relates to an apparatus for measuring current intensity in a direct current circuit through which much current flows, e.g., electrolysis of sodium chloride, by measuring the voltage...
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3688157 |
MOTOR PROTECTION CONTROL APPARATUS
An electric motor protection control apparatus adapted to protect an electric motor being supplied operating power via power conductors, having surge voltage protection apparatus which is connected...
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3681659 |
AMPLIFIER PROTECTIVE CIRCUIT
A protective circuit for protecting transistor amplifiers in which the transistors are interconnected with certain impedances and diodes with switching elements such that voltages and currents...
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3675082 |
DIRECT-CURRENT POWER TRANSMISSION LINE
An improvised a.c. limiter arrangement in a d.c. transmission line having earth wires, comprises connecting a.c. limiters which include reactive elements, in an electric circuit formed by the earth...
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3668465 |
SURGE VOLTAGE PROTECTION FOR CATHODE RAY TUBE DRIVERS
Disclosed in a transient voltage protective network for protecting the transistor of a video amplifier coupled to one of the input terminals of a CRT electron gun from the arcing voltages appearing...
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3662228 |
CIRCUIT ARRANGEMENT FOR GENERATING A SIGNAL AND FOR SUPPRESSING VOLTAGE PEAKS
The diode comprised between two electrodes of a transistor is shunted across the inductor, the third transistor electrode being the output electrode. The diode is connected with respect to its...
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3656024 |
TRANSIENT PROTECTION FOR ELECTRICAL IRRIGATION CONTROL SYSTEMS
Current induced in an electrical irrigation control system by lightning, for example, is delayed and discharged around the relay contacts and solid state components of the individual sprinkler...
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3648110 |
CIRCUIT PROTECTION APPARATUS UTILIZING OPTICAL TRANSMISSION PATH
High-speed circuit protection from high-current pulses is obtained by providing a transmission line loop that includes a light emitter and photodetector at opposite ends of the loop. The optical...
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3617765 |
VARIABLE CLOSING RESISTOR
A source of high-voltage electrical power and an electrical system, comprising transmission lines, which is connectable to the source. Switching means are provided to effect such connection....
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3614530 |
ARRANGEMENT FOR DAMPING ELECTRICAL OSCILLATIONS ON A HIGH-VOLTAGE ALTERNATING CURRENT TRANSMISSION LINE
An arrangement for damping electrical oscillations on a high-voltage line formed in an oscillatory circuit constituted by a compensating inductive reactor and the capacitance of the line itself...
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3614422 |
SURGE REDUCTION RESISTORS BETWEEN A HIGH-VOLTAGE SOURCE AND AN ELECTRON MICROSCOPE ELECTRON GUN
A resistance for adjusting the bias voltage is provided in a high voltage source, a high DC voltage being applied to the resistance, and the high DC voltage and bias voltage are applied to the...
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3590319 |
APPARATUS FOR ATTENUATING VOLTAGE SURGES
In order to attenuate voltage surges which may occur on a high-voltage line upon closing or opening of a power switch located at an end of the line which serves to connect the line to a supply...
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3571658 |
PROTECTIVE SYSTEM FOR CAPACITIVE VOLTAGE TRANSFORMERS INCLUDING A CIRCUIT FOR TFH-COUPLING
A capacitive voltage transformer comprises a transformer having its primary winding connected across an intermediate section of a plurality of capacity sections connected in series between a high...
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3566152 |
HIGH VOLTAGE ELECTRIC CIRCUIT BREAKER INCLUDING A SYNCHRONOUSLY CLOSED RESISTOR SWITCH
Discloses a high voltage circuit breaker for a three-phase AC circuit in which the surge voltages produced by circuit breaker closing are held to a very low value by: (1) preinserting resistance...
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3562544 |
METHOD AND APPARATUS FOR BANG-BANG CONTROL OF REACTANCE TO RESTORE STABILITY IN MINIMUM TIME IN A POWER SYSTEM INVOLVING TIE LINES
The present invention restores a generator or generating station to its original condition of steady state equilibrium following a transient disturbance involving the momentary opening and...
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3558990 |
ARRANGEMENT FOR PROTECTING SEMICONDUCTOR DEVICES CONNECTED IN PARALLEL FROM HOLE-STORAGE VOLTAGE SURGES
In a circuit arrangement wherein a plurality of semiconductor devices such as diodes and thyristors are electrically connected in parallel to divide the load between them, a single capacitor unit...
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3544720 |
PROTECTIVE CIRCUIT FOR LOUDSPEAKER
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3538422 |
R.F. TRANSIENT SUPPRESSION FOR GENERATING MACHINE
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3530349 |
NOISE SUPPRESSION
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3519840 |
REED RELAY SCANNER WITH TRANSIENT SUPPRESSION
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3513327 |
LOW IMPEDANCE PULSE GENERATOR
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3467833 |
DEVICE FOR IN-PHASE CONNECTION OF A LOAD TO AN ELECTRIC POLYPHASE SYSTEM
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3443119 |
SHUNT REACTOR FOR TRANSMISSION LINE
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3414773 |
Automatic relay carrier circuitry for testing multiple terminal points employing timer sampling means
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3401272 |
Ferroresonant transient suppression system
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3388264 |
Nanosecond circuit for eliminating cam bounce
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3385977 |
Electrical noise circuit
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3383519 |
Electric power distribution systems
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