Matches 1 - 50 out of 235 1 2 3 4 5 >


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US20130082715 INSULATION STATE DETECTION CIRCUIT FOR UNGROUNDED POWER SOURCE  
An insulation state detection circuit includes a first charging circuit, a second charging circuit and a third charging circuit. A charging resistance value in the case that a capacitor is charged...
US20130082714 METHOD FOR INSULATION FAULT MONITORING WITH DYNAMIC RESPONSE CHARACTERISTIC  
A method and device for insulation fault monitoring in ungrounded electrical networks. The method includes the following steps: measuring an insulation resistance, determining a responding value...
US20140046534 METHOD AND SYSTEM FOR ISOLATING VOLTAGE SENSOR AND CONTACTOR FAULTS IN AN ELECTRICAL SYSTEM  
A method for isolating voltage sensor errors from contactor errors in an electrical system includes measuring a voltage between ground and a voltage bus rail when a contactor is open, and...
US20150022216 GROUND POTENTIAL RISE WITH DEPTH SENSING  
Ground Potential Rise (GPR) systems and methods with depth sensing measure the GPR between the ground grid and the remote earth. Methods and systems described herein may provide a GPR measurement...
US20120299740 Method and Apparatus Pertaining to Automatic Electrical-Fault Detection  
An automatic fault detector momentarily interrupts a provision of operating power to a load having a minimal forward-bias voltage requirement to thereby provide a testing window and then applies a...
US20110153234 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...
US20150192632 Detecting Ground Fault Location  
A technique and system for detecting a location of a ground fault in an electrical system are provided. The technique and system include steps or components for determining a ground fault voltage,...
US20120257315 ARRANGEMENT FOR GROUND-FAULT DETECTION IN AN AC CIRCUIT AND POWER SUPPLY ARRANGEMENT WITH GROUND-FAULT DETECTION  
The invention relates to an arrangement (10) for ground fault monitoring of an AC circuit between, on one hand, a neutral conductor (N′) of the AC circuit and, on the other hand, a protective...
US20140266234 GROUNDING DETECTION DEVICE AND METHOD  
There is provided a grounding detection device and method. The grounding detection device may include an insulation tester and a grounding resistance providing unit. The insulation tester may be...
US20130169284 UTILITY GROUND DETECTION  
In an embodiment, a missing utility ground detection circuit includes a pair of balanced resistors each connected to receive utility voltage from a different one of a pair of utility power lines,...
US20150042355 Cable System and Test Cable Therefore  
An earth ground testing cable is configured to electrically couple an electrode to a measurement unit. The cable may comprise an outer surface having at least a first marking and a second marking....
US20110012606 INSULATION STATE DETECTOR  
An insulation state detector detects an insulation state with respect to a ground potential portion of a DC power source on the basis of a charging voltage of a flying capacitor. The insulation...
US20150091582 HRG GROUND FAULT DETECTOR AND METHOD  
A HRG ground fault detector and method for detecting a ground fault in a High Resistance Ground (HRG) system are provided. The HRG ground fault detector in one example embodiment includes a first...
US20140015538 Method of Measuring Earth Ground Resistance of a Pylon  
The present disclosure relates generally to a facilitated method for accurately measuring the earth ground resistance of a ground rod, in particular a footing of a pylon acting as a ground rod or...
US20130319862 LEAKAGE CURRENT SENSE CIRCUIT FOR ERROR DETECTION IN AN IMPROVED CAPILLARY ELECTROPHORESIS-ELECTROSPRAY IONIZATION- MASS SPECTROMETRY SYSTEM  
Aspects of the present innovations relate to improved systems that may perform capillary electrophoresis (CE) and CE in conjunction with electrospray ionization (ESI) as an input to a mass...
US20140035594 ELECTRIC LEAKAGE DETECTING APPRATUS  
An electric leakage detecting apparatus is provided with: a first protective resistor in which one end is connected to the positive terminal of a battery; a first detecting resistor in which one...
US20140253138 GROUND FAULT DETECTION DEVICE, GROUND FAULT DETECTION METHOD, SOLAR ENERGY SYSTEM, AND GROUND FAULT DETECTION PROGRAM  
In a ground fault detection device, two photovoltaic strings are disconnected from a photovoltaic power generation system, measurement for one photovoltaic string is performed by a measuring...
US20150002163 DEVICE FOR ESTIMATING THE IMPEDANCE OF AN ELECTRIC EARTH CONNECTION, ASSOCIATED ESTIMATION METHOD AND ELECTRIC POWER SUPPLY SYSTEM  
The device according to the invention for estimating the impedance of an ground connection, the ground connection being connected to the ground of an alternating electric network (14) comprising a...
US20140225625 SYSTEM FOR DETECTION OF A GROUND FAULT IN A HIGH RESISTANCE GROUND NETWORK  
A method is provided for detection of a ground fault in a high resistance network in a voltage source power conversion circuit comprising a power converter that converts incoming AC power to DC...
US20120086458 SYSTEM FOR DETECTION OF A GROUND FAULT IN A HIGH RESISTANCE GROUND NETWORK  
A method is provided for detection of a ground fault in a high resistance network in a voltage source power conversion circuit comprising a power converter that converts incoming AC power to DC...
US20110068802 GROUND FAULT DETECTION DEVICE  
A device and method to determine the presence of a ground fault that distinguishes between the capacitive portion of the currents to ground, and the resistive portion of the currents to ground by...
US20130285669 GROUND FAULT DETECTION CIRCUIT  
A ground fault detection circuit includes an AC power supply and a plurality of resonance circuits. The plurality of resonance circuits are connected between at least one current path formed of a...
US20120299599 ELECTRIC LEAKAGE SENSING APPARATUS  
An electric leakage sensing apparatus includes a pulse generator that supplies a pulse to a coupling capacitor, a voltage detector that detects a voltage at the coupling capacitor, an electric...
US20130088240 METHOD AND APPARATUS FOR DETERMINING AN INSULATION RESISTANCE IN GROUNDED IT SYSTEMS  
The invention relates to a method and an apparatus for determining an actual insulation resistance RISO in IT systems grounded with a functional grounding resistance RHRG, comprising constant...
US20130229189 Defect Detection on Characteristically Capacitive Circuit Nodes  
A test circuit for detecting a leakage defect in a circuit under test includes a test stimulus circuit operative to drive an otherwise defect-free, characteristically capacitive node in the...
US20140239967 Ground Fault Detection Circuit  
A ground fault detection circuit comprising a fuse and a fuse detect circuit. The fuse and the fuse detect circuit are arranged to be coupled in parallel between a reference point and a second...
US20110148428 METHOD FOR MONITORING INSULATION FAULTS IN AN ELECTRIC NETWORK AND VEHICLE COMPRISING AN INSULATION FAULT MONITOR  
A method for monitoring an insulation fault in an electric network with at least one electric power system supplying electric power to one or more electric loads, and at least one insulation...
US20140266236 EARTHED CONNECTION DETECTION  
A mechanism is described for determining whether or not a ground connection is properly earthed by determining whether or not a potential difference exists between a voltage measuring point and a...
US20140225444 EARTH FAULT DETECTION DEVICE, EARTH FAULT DETECTION METHOD, SOLAR POWER GENERATION SYSTEM, AND EARTH FAULT DETECTION PROGRAM  
In a ground fault detection device, two photovoltaic strings are disconnected from a photovoltaic power generation system, a measurement of a first voltage value is performed for the one...
US20130063152 ELECTRIC LEAKAGE SENSING APPARATUS  
An electric leakage sensing apparatus includes a coupling capacitor having one end connected to a DC power supply, a pulse generator that supplies a pulse to the other end of the coupling...
US20140125350 CONNECTOR AND ELECTRICAL LEAKAGE DETECTION DEVICE  
A connector includes a first terminal to which a power supply is connected, the power supply being a direct current power supply, a second terminal to which a signal ground of the direct current...
US20110025341 GROUND FAULT DETECTION  
A ground fault detection system detects an earth fault or ground fault in a network device. The network device may be used in a fire alarm network. The ground fault detection system includes a...
US20150048840 NEUTRAL GROUNDING RESISTOR MONITOR  
A device for monitoring a neutral grounding resistor (NGR), including first and second NGRs electrically connected in parallel, a rectifier circuit electrically connected in series with the second...
US20140049261 PULSED MISSING GROUND DETECTOR CIRCUIT  
In one implementation, a method is provided to detect a ground fault. This includes applying a pulsed test impedance and detecting a utility power voltage with and without the pulsed test...
US20150091583 METHOD FOR DETECTING AN ELECTRICAL CONTINUITY FAULT IN A NETWORK OF METALLIZATION STRIPS AND DEVICE FOR IMPLEMENTING SAME  
A method and device for detecting an electrical continuity fault between a first and a second points of a network of metallization strips, including determining, from mapping, a length or a...
US20150009726 GROUND SCHEME IDENTIFICATION METHOD  
The present techniques include methods and systems for detecting the grounding condition of an electrical system to automatically determine a suitable electrical drive configuration. The drive...
US20140239968 GROUND FAULT DETECTION DEVICE, GROUND FAULT DETECTION METHOD, SOLAR ENERGY SYSTEM, AND GROUND FAULT DETECTION PROGRAM  
A first predetermined point of a photovoltaic circuit insulated with respect to a ground is grounded to the ground by a first electrical ground path, a first direct current voltage value is...
US20130307556 Abnormality Detection Architecture and Methods For Photovoltaic Systems  
One aspect of the inventive technology disclosed herein, in certain embodiments, may involve the determination of at least one measured, instantaneous intra-string current difference for each of...
US20140361783 Detecting Faults in a Two-Wire Power Line  
An apparatus and method for detecting faults in a two-wire electric power line isolated from ground includes substantially identical high impedance voltage dividers connected between each of the...
US20130088239 FAULT-TYPE IDENTIFICATION FOR ELECTRIC POWER DELIVERY SYSTEMS  
Disclosed herein are systems and methods for identifying a fault type in an electric power delivery system using an angle difference between a total zero-sequence current and a total...
US20150212140 NEUTRAL FAULT CURRENT DETECTION DEVICE  
A passive neutral fault current detection device fastened to cable television equipment detects the presence of a neutral fault within a subscriber's premises when the outer conductor of the...
US20110267070 Ground Fault Detection For An Electrical Subsea Control System  
A ground fault detection circuit for detecting ground faults in electrical subsea conductor lines including a first electrical conductor line, a second electrical conductor line, a first ground...
US20130063842 EARTH LEAKAGE DETECTOR WITH SUFFERED CURRENT-BLOCKING FUNCTION  
A leakage detector is provided with the addition of an output control circuit that monitors a circuit wire-to-ground voltage, which is at the root of a suffered operation and produced between a...
US20130234722 HIGH SENSITIVITY DIFFERENTIAL CURRENT TRANSFORMER FOR INSULATION HEALTH MONITORING  
A current transformer is provided. The current transformer comprises an inner magnetic core having a central opening, an outer sense core circumscribing the inner magnetic core, at least one pair...
US20140292347 Low Cost Circuit to Detect Faults of ISC Outputs and/or HV Bus Shorted to Chassis  
A low cost fault detection and protection method and embodiment circuit can detect short circuit faults between an inverter system control (ISC) circuit outputs and a chassis, an electrical...
US20150228407 ZERO-PHASE-SEQUENCE CURRENT TRANSFORMER, GROUND FAULT CURRENT DETECTION DEVICE, POWER CONDITIONER, AND METHOD FOR DETECTING MALFUNCTION OF ZERO-PHASE-SEQUENCE CURRENT TRANSFORMER  
An abnormality occurring in a ZCT is detected simply and reliably. A zero-phase-sequence current transformer (ZCT) (11) detects zero-phase-sequence current in power wires inserted therethrough,...
US20140197843 Plug-In Electric Vehicle Charger Validation and Test Device  
A process and apparatus for performing a ground fault test of a device is disclosed. A current level may be selected from a plurality of predetermined current levels. A ground fault current may be...
US20100315091 Detecting a Short Circuit in an Inductive Load Current Path  
A method detects a short circuit in a load current path that includes an inductive load.
US20120249154 GROUND FAULT DETECTION SYSTEM  
The present application describes, among other things, a ground fault detection system. The system includes an optocoupler, a current sink, and a first voltage source connected in series. The...
US20130221976 MONITORING A POWER SUPPLY LINE SUPPLIED AT ONE END FOR GROUND FAULTS  
A method and a protective device for monitoring a power supply line supplied at one end in a three-phase electrical power supply system with regard to the presence of a ground fault. The power...

Matches 1 - 50 out of 235 1 2 3 4 5 >