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2529results about "Emergency protection detection" patented technology
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Protective relay with synchronized phasor measurement capability for use in electric power systems
InactiveUS6845333B2Current/voltage measurementResistance/reactance/impedenceDigital protective relayEngineering
The relay system obtains voltage and current values from a power line and uses a first sampling element to sample the voltage and current values at selected intervals of time. The resulting sampled signals are used for power system-wide protection, control, monitoring and metering. The sampled signals are then resampled at a rate which is a selected multiple of the power system frequency. The results of the resampling are used by processing circuitry for protection functions including fault determinations.
Owner:SCHWEITZER ENGINEERING LABORATORIES
Signal Activated Circuit Interrupter
InactiveUS20140098445A1Invention is simpleElectric devicesEmergency protection detectionSpace heaterRadon
The current invention is an automatic AC power interruption system built into a portable power strip or a portable casing or integrated into an appliances control circuitry. The invention monitors the environment for hazard alarms, for example, a T3 signal smoke detector alarm, and responds by tripping open the power supply circuit to the power strip's receptacles and thus interrupts AC power to the protected appliances the user has chosen to plug into them. One alternate form of the invention uses a portable casing that can be plugged into a power receptacle and, when a hazard alarm is detected, trip off the nearest GFCI. Other alternate forms of the invention are integrated within an individual appliance's control circuitry and may interrupt power using a built-in switch or by tripping off the nearest GFCI device. The invention's purpose is to help prevent death, injury, and property damage by preventing fires or facilitating fire suppression; more particularly, by interrupting electrical power to problematic appliances, such as toasters, space heaters, battery chargers, stoves, and motors, when a hazardous condition alarm is emitted. It further interrupts power to the problematic appliances when a detector emits an alarm indicating toxic fumes, natural gas, radon, carbon monoxide, or whatever other detector-alarm the consumer installs in the area to be protected.
Owner:HOOPER DONALD RANDOLPH
Hybrid DC circuit breaking device
InactiveUS20150022928A1Emergency protection detectionHigh-tension/heavy-dress switchesDc circuit breakerEngineering
A dc breaker is connected in a main current path between a first dc circuit and a second dc circuit. The dc breaker has a primary current path connected to the main current path. A mechanical interrupter switch and an electronic breaker switch are connected in series in the primary current path. A secondary current path is provided in parallel with the primary current path. A capacitor is arranged in the secondary current path so as to be connected in parallel with the series-connected switches of the primary current path.
Owner:SIEMENS AG
Voltage detector and protection apparatus using the same
ActiveUS20110249476A1Reduce power lossCurrent/voltage measurementDc-dc conversionEngineeringField-effect transistor
A voltage detector includes a zener diode having a cathode connected to a detect terminal of the voltage detector, a junction field effect transistor having an input terminal connected to an anode of the zener diode, and a resistor connected between an output terminal and a control terminal of the junction field effect transistor. When the voltage on the detect terminal is higher than the breakdown voltage of the zener diode, the junction field effect transistor produces a current flowing through the resistor, and thereby a detection signal can be obtained from the voltage across the resistor.
Owner:RICHTEK TECH
Electric Grill With Current Protection Circuitry
ActiveUS20180007738A1Overcome deficienciesEasy to useElectric heatingEmergency protection detectionElectricityTRIAC
Provided is an apparatus and method for protecting against unsafe electric current conditions. A protections circuit may be used in a device, as an electric grill, that has one or more electric loads, such as heating elements. The protection circuit may protect against various failure scenarios, including, without limitation, instances of ground fault, over current, driver failure, and failure of a microprocessor. In response to a failure, the protection circuit may trip a latch relay or disable a triac driver to stop current from flowing.
Owner:WEBER-STEPHEN PRODUCTS
Signal-Activated Circuit Interrupter
InactiveUS20150077243A1Electric devicesFrequency-division multiplex detailsSmoke detectorsEngineering
The current invention is an automatic AC power interruption system built into a portable apparatus or integrated into electrical systems and appliance control circuitry. Power is interrupted in potentially hazardous conditions, for example, when a T3 smoke detector alarm signal is detected. Alternatively, a portable device may be plugged into a power outlet having a GFCI breaker and, when a hazard alarm condition is detected, trip off power to the outlet. Signal-activated circuit interrupters (SACIs) may be integrated into appliance control circuitry and interrupt power to a problematic device when a hazard alarm condition is detected. In addition to fire prevention, other hazard alarm conditions may include alarms indicating toxic fumes, motor overload, natural gas, radon, or carbon monoxide. Interconnected networks of signal-activated circuit interrupters are also disclosed.
Owner:HOOPER DONALD RANDOLPH +1
Apparatus for detecting fault of power relay of inverter
ActiveUS20180254624A1Current/voltage measurementConversion with intermediate conversion to dcElectrical resistance and conductanceVoltage drop
An apparatus for detecting a fault in a power relay of an inverter is disclosed. The apparatus for detecting a fault in a power relay includes: a voltage sensor configured to measure a voltage of a DC link; a current sensor configured to measure an output current applied to an inverter stage; a storage unit configured to store resistance of an initial charge resistor, a time constant of a capacitor, and a reference voltage measured when voltage drop of the DC link does not occur; and a controller configured to determine, when the voltage drop of the DC link occurs, the presence or absence of a fault in the power relay based on a difference between the reference voltage and a voltage measured after lapse of a period corresponding to the time constant.
Owner:LSIS CO LTD
Electrical switching apparatus including a plurality of rogowski coils and method of calibrating the same
ActiveUS20110050154A1Improve system accuracySensitive high resistance ground fault detectionParameter calibration/settingMotor/generator/converter stoppersElectricityElectrical conductor
An electrical switching apparatus includes a plurality of poles each having a Rogowski coil and a conductor passing through an opening thereof, and a processor circuit including a sensor circuit including a plurality of inputs each electrically interconnected with an output of the Rogowski coil of a corresponding pole. The sensor circuit further includes a number of outputs having values each corresponding to current flowing through the conductor, a memory including for each corresponding pole an offset value and a gain correction factor for the sensor circuit, and a gain correction factor for the Rogowski coil, a number of routines, and a processor cooperating with the sensor circuit and the routines to provide for each pole a corrected current value as a function of a corresponding one of the values, the sensor circuit offset value and gain correction factor, and the Rogowski coil gain correction factor.
Owner:EATON INTELLIGENT POWER LIMITED
Leakage current detection and interruption circuit powered by leakage current
InactiveUS20100020452A1Emergency protection detectionEmergency protective arrangements for limiting excess voltage/currentElectrical conductorEngineering
A circuit is disclosed for disconnecting a power source upon the detection of a leakage current from one of a first and a second wire connected to the power source. A sensing conductor is located adjacent to one of the first and second wires for sensing a leakage current from one of the first and second wires. A disconnect switch is interposed within the first and second wires connected to the power source. A disconnect switch control circuit is connected to the sensing conductor for opening the disconnect switch upon the presence of a leakage current from the sensing conductor. The disconnect switch control circuit operates solely from the leakage current from the sensing conductor.
Owner:TECH RES
Diagnostic system and method for electric leak detecting device
InactiveUS6970807B2Guaranteed uptimeVehicle testingPlural diverse prime-mover propulsion mountingElectricityElectrical battery
A power supply unit includes a battery, a motor which is driven by the battery, an electric power converting device which is provided between the battery and the motor, a simulated electric leak generating device which generates an electric leak state between the battery and a vehicle body, and an electric leak detecting device which detects a simulated electric leak. A diagnostic system which performs a diagnosis of operating performance of the electric leak detecting device includes an opening / closing device which connects / disconnects the electric power converting device to / from the battery, and an opening / closing detecting device which detects opening / closing of the opening / closing device and which outputs a result of detection to the simulated electric leak generating device and the electric leak detecting device. When opening / closing of the opening / closing device is detected by the opening / closing detecting device, both generation of a simulated electric leak and detection of an electric leak are retried.
Owner:TOYOTA JIDOSHA KK
Powered panel moving system
InactiveUS7312591B2High mechanical advantageDC motor speed/torque controlAc motor stoppersDriver circuitCurrent sensor
A powered panel moving system includes a motor, electronic drive circuitry, a mechanism, a coupler, and electronic function circuitry. The drive circuitry drives a rotor of the motor. The coupler couples rotational output of the rotor to the mechanism to drive the mechanism in order to move the panel. The function circuitry is integrated with the drive circuitry for providing additional functionality beyond driving the motor for panel movement. The drive circuitry includes a current sensor for determining rotor position based on motor current, a back emf sensor for determining rotor position based on back emf of the motor, and an impedance sensor for determining rotor position based on motor impedance. The function circuitry may include an analyzer to determine presence of an obstruction to the motion of the panel based on at least one of the rotor position, the motor current, and the back emf of the motor.
Owner:UUSI
Built-in instrumentation integrating power measurement, distribution and management, power safety, and automation control
PendingUS20200328586A1Power distribution line transmissionCoupling device detailsControl engineeringInstrumentation
Built-in instrumentation for power measurement integrating power monitoring, delivery and management, power safety, and automation control.
Owner:BRAINWAVE RES CORP
Solid-state line disturbance circuit interrupter
ActiveUS20190207375A1Reduce power consumptionLow costAc-dc conversion without reversalEmergency protection detectionLow voltageHigh pressure
The invention relates to a novel approach for the protection of electrical circuits from ground faults and parallel and series arc faults in a fully solid-state circuit configuration. Solid-state circuits and methods of use are described that provide the key functions of low-voltage DC power supply, mains voltage and current sensing, fault detection processing and high voltage electronic switching.
Owner:INTELESOL LLC
Inverter system
InactiveUS20070103163A1Delay detectionChange detectionTransformersCurrent/voltage measurementPower inverterTransformer
An inverter system which converts DC input into AC output and supplies the AC output to a load such as an FL tube detects change in a circuit current due to anomaly such as discharge without contacting with a current route. Relating to an inverter which converts DC input into AC output and supplies the AC output to a load, change in a circuit current of the inverter is detected through the medium of magnetic flux change due to the change in the circuit current caused by discharge. For example, if change in a current occurs in the circuit current of the inverter by disconnection discharge or ground-fault discharge occurring in a current route including a load of the inverter, magnetic flux change occurs in circuit wiring and a space of a core gap of a transformer of the inverter. The change in the circuit current is detected through the medium of the magnetic flux change without contacting with the circuit wiring or the transformer.
Owner:FUJITSU LTD
Combination current sensor and relay
InactiveUS6888712B2Reduce the numberShorten the timeCircuit-breaking switches for excess currentsEmergency protection detectionElectricityPower cable
Owner:VERIS INDS
Overcurrent Protective Device, Electronic Apparatus, Integrated Circuit, and Signal Transmission Circuit
ActiveUS20170063074A1Suppresses passagePrevent erroneous operation of loadTransistorSolid-state devicesElectric equipmentElectrical current
The present overcurrent protective device comprises an input terminal configured to receive a power supply voltage, an output terminal, a switch, a detector, and a controller. The switch is provided between the input terminal and the output terminal. The detector is configured to output a limitation signal without delay when a current flowing through the switch exceeds a prescribed tolerance value. The controller is configured to receive the limitation signal and control the switch to prevent the current from exceeding the tolerance value. The detector is configured output a turn-off signal to the controller when a first state continues for a delay time determined depending on the current's magnitude. The first state is a state where the current is smaller than the tolerance value and the current exceeds a first threshold value smaller than the tolerance value. The controller turns off the switch in response to the turn-off signal.
Owner:ROHM CO LTD
Power Supply Apparatus With Function of Detecting Abnormality of Current Sensor
InactiveUS20080094762A1Improve accuracyAC motor controlDC motor speed/torque controlCurrent sensorEngineering
A current detector (60) samples a motor current (MCRT_A) from a controlling sensor and a motor current (MCRT_B) from a monitoring sensor, and holds respective motor current maximum values (MCRT_Amax, MCRT_Bmax) at each prescribed operation cycle. An abnormality determiner (62a) detects that the motor current maximum value (MCRT_Amax) is in GND short-circuiting range and that the current difference between the maximum values exceeds a prescribed threshold value at each of successive operation cycles, to thereby determine an abnormality of the controlling sensor. Then, the abnormality determiner (62a) generates a detect signal (DET) specifying the current sensor abnormality and outputs it to a relay driver (64) and an alarm (66). Relay driver (64) receives the detect signal (DET) and generates a signal (SE) to turn off a system relay. The alarm (66) generates a signal (AL) and outputs it to display means arranged outside a power supply apparatus.
Owner:TOYOTA JIDOSHA KK
Energy-feeding flexible grounding device for power distribution network, fault arc extinction method and direct-current-side-voltage control method and system of energy-feeding flexible grounding device
InactiveCN107482607AImprove reliabilityKeep constantAc-dc conversion without reversalEmergency protection detectionCapacitor voltageControl manner
The invention discloses an energy-feeding flexible grounding device for a power distribution network, a fault arc extinction method and a direct-current-side-voltage control method and system of the energy-feeding flexible grounding device. The fault arc extinction method includes the steps that when a single-phase grounding fault is generated, a neutral point of the power distribution network is grounded through a flexible grounding device, the flexible grounding device is controlled to inject a resistive current and a reactive current into the neutral point in sequence, a fault feeder line is judged, and arc extinction of a fault point is promoted. The direct-current-side-voltage control method includes the step that energy exchanging between the flexible grounding device and the power distribution network is achieved through a direct-current-side capacitor voltage outer loop and a three-phase input current inner loop, and therefore it is guaranteed that the direct-current-side voltage is constant. By means of the direct-current-side-voltage control method, the problems that the direct-current-side voltage of a traditional flexible grounding device is difficult to stabilize, the harmonic content of an injected current is high, and system stability is poor can be solved; by switching control modes, the fault feeder line can be accurately identified, an instant grounding fault electric arc can be eliminated, and the power supply reliability of the power distribution network can be improved.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
Apparatus and method for filtering current sensor output signals
ActiveUS7304829B2Parameter calibration/settingEmergency protection detectionCurrent sensorThird harmonic
An electronic filter for filtering the output signal of a current sensor of a circuit breaker is disclosed. The current sensor has an output signal characteristic similar to that of a Rogowski coil output signal characteristic that includes a third harmonic noise component in response to a switching primary current of the circuit breaker, and the circuit breaker has an electronic trip unit with an instantaneous pick-up setting responsive to the output signal of the current sensor. The electronic filter includes a first stage and a second stage. The first stage has a first transfer function that defines first characteristic poles and permits passage of the third harmonic noise component. The second stage has a second transfer function that defines second characteristic poles and filters the third harmonic noise component.
Owner:ABB SPA
Apparatus and method for identifying a loss of a current transformer signal in a power system
ActiveUS7345863B2Circuit-breaking switches for excess currentsEmergency protection detectionControl signalElectric power system
Owner:SCHWEITZER ENGINEERING LABORATORIES
Method for processing interphase short circuit of three-phase non-effective grounding power supply system
ActiveCN113725823AAuto excludeAutomatic tripping to quickly rule outEmergency protection detectionShort-circuit testingClosed loopControl switch
The invention discloses a method for processing interphase short circuit of a three-phase non-effective grounding power supply system. The method comprises the following steps: when two-phase or three-phase interphase short circuit occurs in a line, maintaining one fault phase of the line to be conducted and tripping off other fault phases, and artificially grounding the other fault phase conducted with the fault phase or directly utilizing the existing grounding point; enabling a live-line phase or a neutral point of the three-phase non-effectively grounded power supply system except the fault phase to be circularly connected and disconnected with the ground, so that the live-line phase or the neutral point and the fault phase form a closed loop and generate a current pulse, and detecting the current pulse by a controlled switch; when a certain controlled switch reaches a trigger condition and cuts off a line, eliminating a fault. According to the method, the inter-phase short-circuit fault point interval can be quickly positioned, the fault can be automatically, quickly and accurately removed, the processing quality of the inter-phase short-circuit fault can be well improved, and the power supply safety is improved.
Owner:BAODING YUXIN ELECTRICAL TECH
Ground fault detection system and method
A ground fault detection system is provided. The ground fault detection system includes a magnetic core having first and second primary legs and a secondary leg disposed between the first and second primary legs. The ground fault detection system also includes first and second primary windings disposed around the first and second primary legs respectively and configured to introduce current in the first and second primary legs. Further, the ground fault detection system includes first and second secondary windings disposed around the first and second primary legs respectively and configured to detect a ground fault based upon a magnetic flux generated in response to the introduced current.
Owner:ROCKWELL AUTOMATION TECH
Protective relay device, system and methods for Rogowski coil sensors
Relay devices, systems and methods for obtaining an accurate representation of a current monitored with a Rogowski coil, without integration of the Rogowski coil output voltage signal in the time domain.
Owner:EATON INTELLIGENT POWER LTD
Circuit interrupter with optical connection
Circuit interrupter positioned between supply circuit and load circuit includes fault detection circuit that senses wave forms to the load circuit, fault processing circuit that detects presence of fault and generates fault output signal when fault detected, and control circuit switch connected to fault processing signal output, wherein control circuit switch is opened by presence of fault output signal, thus isolating load circuit from supply circuit. Preferably fault processing circuit and control circuit are optically linked, such that when fault is detected, control circuit switch is opened by optical fault output signal, thus isolating load circuit from the supply circuit. Circuit interrupter may couple another circuit interrupter via power distribution control unit, optionally manageable remotely via automated control interface.
Owner:INTELESOL LLC
Simultaneous Fault Detection and Location of Power Distribution Systems
ActiveUS20200326363A1Quick checkReduce decreaseEmergency protection detectionFault location by conductor typesPhase currentsElectric network
Systems and methods are configured for detecting and locating simultaneous faults in a distribution network having primary and secondary buses connected with two-terminal sections. The measured three-phase voltages and currents from the primary buses are received via a communication network, and the series impedances and shunt admittances and the pre-fault connectivity topology are retrieved from the storage. Simultaneous faults are determined to occur by verifying at least one phase of at least three buses having phase current mismatches determined as the differences between the measured values and calculated values using normal topology and phase voltages that are greater than a threshold. A location for each fault is determined individually if the faults are occurring at non-adjacent sections in the distribution network, or jointly if the faults are occurring at adjacent sections in the distribution network. Faulted line sections are isolated by activating switching operations for connected switches to the faulted line sections that communicatively linked to distribution system grid via communication network.
Owner:MITSUBISHI ELECTRIC RES LAB INC +1
Line protection circuit and LCD
InactiveCN105162077AAvoid burnsStatic indicating devicesEmergency protection detectionLiquid-crystal displaySupply management
The invention discloses a line protection circuit and an LCD. The circuit comprises a detection module and a feedback module, wherein the output terminal of a power supply management module is in connection with one terminal of a level transfer module, the other end of the level transfer module is in connection with the first terminal of the detection module, the second terminal of the detection module is in connection with a WOA line module or a GOA line module, the third terminal of the detection module is in connection with one terminal of the feedback module, and the other terminal of the feedback module is in connection with the enabled terminal of the power supply management module. The detection module is used for detecting whether the WOA line module or the GOA line module exists short circuit, and feeding back short circuit signals to the feedback module if the WOA line module or the GOA line module exists short circuit; the feedback module is used for receiving the short circuit signals fed back by the feedback module, and sending non-enabled signals to the enabled terminal of the power supply management module according to the short circuit signals to forbid a voltage management module.
Owner:TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
Hand-held electronic device and method for preventing fall of the same
ActiveUS20110109170A1Reduce current consumptionLenientBoards/switchyards circuit arrangementsPower network operation systems integrationCapacitanceElectrical battery
The hand-held electronic device includes a central processing unit, a memory unit, a state-detecting unit, a state-determining unit, a main power supply unit, a standby power supply unit, and a power supply switching unit. After determining the presence of a fall state, the state-determining unit will output a fall prevention instruction and which causes the central processing unit to enter a low-potential current mode; meanwhile, the power supply switching unit monitors power output and continues to supply low-potential power. In case of a fall of the hand-held electronic device, the device and method protect operation data and reduce the otherwise power-consuming current. The less power-consuming current is conducive to the reduction of capacitance required for a backup battery. The low-potential current mode is effective in reducing the time taken to recover the operation mode of the electronic device.
Owner:ASKEY COMP
Overcurrent detection circuit
ActiveUS20150309090A1Accurate and stable detectionStable generationCurrent/voltage measurementDc-dc conversionElectrical resistance and conductanceAudio power amplifier
An overcurrent detection circuit includes a current detection resistor that generates a voltage in proportion to current flowing through a switching element and a comparator that compares the voltage detected via the current detection resistor and a reference voltage generated by a reference voltage generation circuit to thereby detect overcurrent flowing through the switching element. In particular, the reference voltage generation circuit includes: a first resistance voltage dividing circuit that resistance-divides a standard voltage by connecting, in series, two types of resistors having different temperature characteristics; a second resistance voltage dividing circuit that resistance-divides the standard voltage by connecting, in series, resistors having the same temperature characteristics; and an instrumentation amplifier that generates the reference voltage according to the difference between the divided output voltages of the first and second resistance voltage dividing circuits.
Owner:FUJI ELECTRIC CO LTD
Power supply apparatus with function of detecting abnormality of current sensor
InactiveUS7450355B2Improve accuracyDC motor speed/torque controlTemperatue controlCurrent sensorContinuous operation
A current detector (60) samples a motor current (MCRT_A) from a controlling sensor and a motor current (MCRT_B) from a monitoring sensor, and holds respective motor current maximum values (MCRT_Amax, MCRT_Bmax) at each prescribed operation cycle. An abnormality determiner (62a) detects that the motor current maximum value (MCRT_Amax) is in GND short-circuiting range and that the current difference between the maximum values exceeds a prescribed threshold value at each of successive operation cycles, to thereby determine an abnormality of the controlling sensor. Then, the abnormality determiner (62a) generates a detect signal (DET) specifying the current sensor abnormality and outputs it to a relay driver (64) and an alarm (66). Relay driver (64) receives the detect signal (DET) and generates a signal (SE) to turn off a system relay. The alarm (66) generates a signal (AL) and outputs it to display means arranged outside a power supply apparatus.
Owner:TOYOTA JIDOSHA KK
Fault current limiter having self-checking power electronics and triggering circuit
InactiveUS20170244241A1Facilitate checking componentIncrease currentCurrent/voltage measurementElectronic switchingElectricityCurrent limiting
A fault current limiter may include a current limiting leg to transmit a first current and a control leg in parallel with the current limiting leg, the control leg to transmit a second current. The control leg may include a plurality of solid state switches arranged in electrical series with one another; a plurality of current monitors arranged in electrical series with the plurality of solid state switches; and at least one triggering circuit, wherein the plurality of current monitors are electrically coupled to the at least one triggering circuit, and wherein the at least one triggering circuit is optically coupled to the plurality of solid state switches.
Owner:VARIAN SEMICON EQUIP ASSOC INC
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