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8125807 Transformerless photovoltaic grid-connecting inverting device and control method thereof  
The present invention relates to a transformerless photovoltaic grid-connecting inverting device and an inverting control method thereof. The inverting device comprising a boosting unit, an...
7944084 Peripheral module and peripheral system for an automation system  
There is described a peripheral module which in addition to the connection terminals for the process data supply has connection terminals for the supply of voltage. Furthermore, the peripheral...
7872447 Electrical storage apparatus for use in auxiliary power supply supplying electric power from electric storage device upon voltage drop of main power supply  
In an electrical storage apparatus including an electric storage device connected between a main power supply and a load, a first bypass FET and a bypass diode which are connected in series between...
7821749 Arc flash elimination apparatus and method  
An arc crowbar with electrodes separated by a gap in a protective case. Each electrode is connected to an electrically different conductor of a circuit. A sensor detects an arc flash condition on...
7633736 Circuit interrupter including nonvolatile memory storing cause-of-trip information  
A circuit breaker includes separable contacts, an operating mechanism structured to open and close the separable contacts, and a trip mechanism. The trip mechanism includes a sensor structured to...
7603243 Method and error location in branched low voltage and medium voltage networks and evaluation circuit used thereof  
The invention relates to a method for error location in branched low voltage and medium voltage networks and to an evaluation network used therefor. The inventive method consists of the following...
7579719 Protector suitable for cascade connections and corresponding method for safety-conditioned switching  
An installation is disclosed which can be switched on again by way of a common switch-on key. A pulse processing device integrated into the respective emergency off device is required for putting...
7542256 Relay device and corresponding method  
A method of operating a relay device, the method comprising the steps of: providing main circuit-breakers and a bus-tie-breaker connecting the main-circuit-breakers; defining a...
7511933 System and method for protecting transient-suppressing elements against over-voltage conditions  
An over-voltage protection system including a phase bus connected to a phase conductor of an electrical system and one or more transient-suppressing lines connected to the phase bus. Each of the...
7457088 Systems and methods for protection of electrical networks  
A system and method for accomplishing power swing blocking and unstable power swing tripping schemes during disturbances of electrical networks is disclosed. The disclosed system and method...
7365451 Power converter  
A power converter that can continue to operate after suffering a partial failure. The power converter includes multiple array transformers; normally-on switches connected respectively in series...
7336165 Retrofitting detectors into legacy detector systems  
The disclosure includes improvements in the field of retrofit-detector installation such as adapters that simplify retrofit of addressable detectors onto previously installed zone-type system...
7291940 Pressure sensitive switches including touch sensor structures  
An electronic circuit for use with an exhaustible power source and at least one load such as a light bulb, a radio or motor, includes a microchip with an input that transmits a signal to the...
7154722 Loop control for distribution systems  
The invention contemplates a technique for providing loop control on a faulted overhead or underground loop system, while preventing restored current from being fed or back fed into the fault. In...
7119459 Intelligent switch for connecting power to a load  
A switching circuit includes a microchip which, in response to a signal from a signal switch, controls the operation of a power switch which, when closed, connects a load to a battery. The...
7110231 Adaptive protection system for a power-distribution network  
A preferred embodiment of a system comprises a recloser electrically coupled to a voltage source of a power-distribution network and adapted to isolate a section of a distribution feeder of the...
6842319 Procedure for producing an initiation signal after the current differential protection principle arrangement  
The invention relates to a method and arrangement for generating a trigger signal according to the current differential protection principle when a fault occurs on a section of an electrical power...
6826027 Audio line isolator  
A method for isolating suites includes the steps of isolating the suites when an alarm is initiated, setting a timer during isolation creating a window of time to clear a short circuit, clearing...
6611409 Line module protection method and device utilizing said method  
The present invention relates to a line module protection method and a device utilizing that method. According to the line module protection method of the present invention, line module protection...
6539287 Distribution control system capable of isolating fault section without using time limited sequential shift function  
A distribution control system includes in each of feeder terminal units a controller that updates a value in a latest current value storage area of a memory, every time a current value is detected...
6373669 Process and arrangement for selective network monitoring for switchgear  
In switchgear with superordinate power circuit-breakers and a plurality of subordinate power circuit-breakers, the superordinate power circuit-breaker must be triggered in the event of failure of...
6160690 Distribution control system and distribution control method capable of isolating fault section without fail  
A distribution control system that can isolate a fault section without fail, even if control of load break switches becomes impossible because of a communication error between a control center and...
6144110 Vehicular use power distribution apparatus and vehicular use power source apparatus  
A vehicular use power distribution apparatus includes a battery mounted in a vehicle; a main control means connected directly to the battery; a first switch means connected to the battery; a power...
6141195 Data and/or energy transmission device with a disconnecting unit  
Short-circuits are liable to occur between the two conductors in a system in which data and/or energy is transmitted to a plurality of receivers/users via two conductors. Transmission is then...
6075378 Electrical energy storage capacitor power supply capable of shorting out defective capacitors  
There is disclosed a power supply for storing electrical energy in capacitors connected in series, the power supply having a function of shorting out capacitors at fault. Shorting means are...
5999389 Repeater for bus with bus fault isolation  
A repeater for a communication network having an isolation circuit for disabling the transmission of a fault-indicative signal through the repeater onto the network. A retriggerable one-shot starts...
5973410 Safety device for linking reference grounds in an integrated circuit  
The safety device, especially in an electronic motor vehicle control system, protects external circuit branches supplied with current from an engine/motor vehicle control unit so that a single...
5973899 Automated power feeder restoration system and method  
A feeder restoration method starts in response to an overcurrent fault on a feeder (22) that causes a circuit breaker (42) to trip open, reclose once, trip again, and attempt to reclose again....
5920129 Uninterruptible power supply having solid state transfer switch and method of operation thereof  
An uninterruptible power supply (UPS) for supplying DC power to a load and a method of providing uninterruptible DC power to a load. In one embodiment, the UPS includes: (1) a first stage rectifier...
5901024 Apparatus and method for circuit protection  
Apparatus for redundancy circuit protection includes a controller (20), a plurality of circuits (22) coupled to the controller (20), and a redundancy switch (50) coupled between the plurality of...
RE36087 Method and system for decoupling inoperative passive elements on a semiconductor chip  
The present invention teaches a method and system for disconnecting shorted decoupling capacitors, wherein a semiconductor chip having a plurality of redundant decoupling capacitors. Each of the...
5631795 Line fault monitoring apparatus  
The present invention relates to a line fault monitor for detecting a short circuit in a terminal-side loop line and disconnecting the short-circuit portion from a power supply, so that the...
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...
5515227 Fault identification system for use in protective relays for power transmission lines  
The angle between the negative sequence and zero sequence currents for a power signal on a transmission line is measured and compared against a plurality of successive angle ranges from 0° to ...
5467241 Power receiving system  
In a power receiving system, a network transformer, a protector breaker and a current detector are connected between the load side of each of a plurality of network lines and a network bus, a...
5402299 Coordination arrangment for protective devices in electrical systems  
An arrangement to coordinate protective devices is provided by defining operation of the instantaneous characteristic portion of an upstream protective device to coordinate with a downstream...
5303112 Fault detection method and apparatus  
Method and apparatus are provided responsive to the circuit parameters at one or more locations of an electrical power transmission and/or distribution network for detecting protective device...
4933802 Gas insulated switchgear system having single phase reserve bus  
A gas insulated switchgear system having two gas insulated switchgear equipments, each of which consists of first disconnecting switches, circuit breakers, and second disconnecting switches, three...
4873601 Spot network type power receiving and transforming protective apparatus  
A device which protects a spot network type power receiving and transforming system when, while the system and an electric generator are operating in parallel, overall interruption of power...
4825323 Out-of-step blocking unit  
An out-of-step blocking unit of a protective relay for detecting faults in a three phase alternating current electrical power distribution system utilizes restraint signals in conjunction with an...
4760488 Transmission control apparatus for duplex loop type transmission system  
This invention relates to a duplex loop type transmission system which is so constructed that a plurality of transmission stations are loop-connected with two transmission lines, and the control...
4758919 Sectionalizer for spur lines  
Fault currents in the phases of a three-phase supply are detected by transformers 28 in respective phase links 14 and are counted by associated circuits 24 when any one of the circuits 24 reaches a...
4733320 Line protection switch equipment  
A line protection switch equipment (LPSW) in a communication system, having a plurality of two-input and two-output switches connected between lines including a protection line and working lines,...
4614906 Series circuit regulating apparatus  
Current regulating apparatus for connecting a plurality of different impedance loads in series across a high voltage power source with protection means in the event of the failure in the shorted or...
4593233 Lamp drive circuit  
An alternator circuit comprises an alternator having an armature winding, a field winding, a voltage regulator, a fault detecting circuit, a lamp drive circuit having its input connected to the...
4562507 Protective relay  
A protective relay which hardly makes maloperation in itself regardless of mixing of low-order higher harmonics in its at least two sinusoidal input signals comprises a first and a second phase...
4541031 Loop fault isolator  
The invention comprises a method and a device for locating, isolating and by-passing a defective electrical device in an electrical circuit, and comprising sensing current and voltage at a first...
4528610 Short circuit fault isolation means for electrical circuit arrangements  
Circuitry is described for isolating a section of a loop circuit (L) from a bi-directional supply unit (20) in the event of a short circuit in the section. One or more circuit elements (21), such...
4502086 Differential protective relay  
A differential protective relay for protecting devices on an ac electrical power system. The protected devices can include a transformer, a generator, or a station bus. The differential protective...
4484246 Reclosing device for transmission line  
When the positive-phase voltage of one terminal of a transmission line involved in a fault detected by a positive-phase relay exceeds a predetermined value, an output is supplied to the reclosing...
Matches 1 - 50 out of 82 1 2 >