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7528611 |
Methods and system for detecting winding faults in a generator with parallel windings
A method for detecting stator ground faults in a generator is described. The method includes receiving a neutral voltage signal from a neutral point of a stator, receiving a plurality of terminal...
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7528608 |
Sensor device for a household appliance
Sensor device for a household appliance that includes a body ( 2 ), detector device to measure at least one variable of a fluid and which includes a conductivity sensor, and a printed circuit ( 3 )...
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7456635 |
Circuit arrangement comprising a multi-wire line for supplying current and emitting signals
A circuit arrangement with a multi-wire line for supplying current to a sensor and for emitting a signal that corresponds to a measured value to an evaluation module via a signal line. To eliminate...
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7411404 |
Apparatus, system, and method for detecting an electrical short condition in a dynamoelectric machine
A system, apparatus, and method ( 10 ) for detecting an electrical short condition in a dynamoelectric machine are described. The method includes determining an operating parameter of a...
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7337081 |
Metering device with control functionality and method thereof
A metering device of a power substation and method are provided for operating on a secondary analog waveform output by a transformer assembly receiving a primary waveform. The method includes...
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7323878 |
Ground testing method and apparatus
The present invention is directed to a ground-current isolating circuit for providing a low voltage barrier between a service neutral conductor and an associated grounding system. The voltage...
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7253634 |
Generator protection methods and systems self-tuning to a plurality of characteristics of a machine
A method for detecting stator ground faults in a generator is described. The method includes receiving a neutral voltage signal from a neutral point of a stator, receiving a plurality of terminal...
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7253629 |
Circuit protection device with grounded neutral half cycle self test
The present invention is directed to a circuit and method for self-testing a protection device for use in an AC power distribution system. The device is configured to be coupled between an AC power...
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7154277 |
Method and apparatus for detecting faults in AC to AC, or DC to AC power conversion equipments when the equipment is in a high impedance mode
A system for use in ac to ac or dc to ac power conversion equipment to detect faults in an inverter when the inverter is in a high impedance mode. The system detects ground faults or cross wiring...
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7154278 |
Arrangement for detecting a leakage current or defect current
The invention is based on a circuit arrangement for the detection of a leakage current or defect current, by means of which the power supply of an electronic circuit can be switched off. It is...
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7118380 |
Connector arrangement in wrist strap monitors
A connector assembly for a wriststrap jack is provided wherein the jack may be easily replaced in accordance with the invention.
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7110895 |
Leakage current or resistance measurement method, and monitoring apparatus and monitoring system of the same
A method for measuring the resistance component current included in the leakage current is provided. In a monitoring apparatus and system for measurement the signal waveform of at least one AC...
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7102356 |
Electrical leakage detection circuit
A method is provided for detecting electrical leakage between a power supply and a frame of a vehicle or machine. The disclosed method includes coupling a first capacitor between a frame and a...
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7102355 |
Method, apparatus and computer-readable code for magnifying an incipient ground fault and enable quick detection of such fault
Method, apparatus and computer-readable code are provided for detecting a location of an incipient ground fault in an electrical propulsion system of a relatively large land-based vehicle, such as...
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7068037 |
Method of diagnosing inverter trouble
Disclosed is a method of diagnosing inverter trouble capable of improving convenience of use and safety of the user by notifying the user of the error of switching devices used for outputting AC...
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7005995 |
System and method for remotely detecting and locating damaged conductors in a power system
A system is provided for remotely detecting and locating damaged conductors. The system includes at least one slave controller disposed proximate at least one load and electrically connected to the...
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6963216 |
Method and apparatus for detecting shorted rectifying control elements of an engine driven power source for welding-type system
An apparatus for electrical protection of an electrical system includes a protection circuit for detecting when silicon controlled rectifier (SCR) or other control elements in an engine driven...
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6940413 |
Method and apparatus for monitoring operation of electrical household appliances
Discloses is a method and a corresponding apparatus for monitoring operation of electrical household appliances (such as a freezer). The method includes checking the temperature inside the freezer...
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6914440 |
Welding system and method utilizing a ground integrity monitor
A welding system having a welding gun, comprising a casing that is grounded through a ground conductor, and a monitoring device, which detects the resistance of the ground conductor. A blanking...
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6906525 |
Ground detection apparatus for electric vehicle
A ground detection apparatus for electric automobile having a high-voltage DC power supply ( 31 ) which is electrically insulated from a body and a three-phase AC motor ( 33 ) which is driven by a...
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6876222 |
Automated stator insulation flaw inspection tool and method of operation
An automated tool for performing an EL CID inspection of the step iron region of a generator stator that can be employed with the rotor in place. The tool has a track that is axially cantilevered...
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6856137 |
Ground fault detection system and method
In one embodiment, an AC ground fault detector system senses an AC signal indicative of an unintended electrical path between a load driven by a power source and a reference potential using a...
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6844736 |
Systems and methods for locating a ground fault without de-energizing the circuit
Systems and methods for locating any grounded circuit on an ungrounded AC or DC system without de-energizing the circuit, and enabling isolation of the grounded component of the circuit. A load is...
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6829556 |
Method and system for detecting incipient failures in a traction system
A method and system for operating an electrical system including an electrical machine to predict an incipient fault in the electrical machine. A neutral-to-ground leakage signal representative of...
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6798210 |
Speed sensitive field ground detection mode for a generator field winding
A method for locating a speed sensitive ground condition in a field winding of an electromagnetic synchronous machine having a rotor and an excitation circuit, the method including: sensing a...
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6777954 |
Faulty wiring detection device for air conditioner
An air conditioner includes an air conditioning unit, and three wiring lines for supplying power to the air conditioning unit. The three wiring lines are a pair of single phase AC power lines and...
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6633169 |
Monitoring leakage currents from high-voltage devices
Monitoring a leakage current from an isolator for a high voltage conductor to ground includes directing the leakage current through a primary wire inductively coupled to a secondary winding...
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6593767 |
Leak detection method for electrical equipment
A leak detection method for electrical equipment provided with an electric motor, includes the step of detecting, during non-energization of the motor, a voltage generated in a voltage-dividing...
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6504382 |
Electrical system with a stress shield system for partial discharge on-line monitoring of the state of high-voltage insulation
An electrical system and a sensor for on-line monitoring of the state of high-voltage insulation in the electrical system. In this arrangement, the signals associated with partial discharge...
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6496012 |
Apparatus and method for detecting a short circuit in a lighting system
An apparatus and method for detecting a short in a load which receives power from a transformer having a primary winding and a secondary winding with the load being connected to the secondary...
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6496015 |
Method of performing a dielectric voltage-withstand test on a wire harness
A method of performing a dielectric voltage-withstand test on a wire harness having a plurality of conductors includes applying voltage simultaneously to a first subset of the conductors. The first...
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6489782 |
Electrical system with a stand-off insulator-sensor for on-line partial discharge monitoring of the state of high-voltage insulation
For an electrical system a sensor and associated circuits are provided for on-line monitoring of the state of the high-voltage insulation in the electrical system. In this arrangement, both the...
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6456085 |
Diagnostic device for detecting short circuits or line interruptions in an inductive sensor
A symmetrical voltage divider whose tap is supplied with a reference voltage via a resistor is connected between the terminals of an inductive sensor. A diagnostic voltage is applied to the tap....
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6445188 |
Intelligent, self-monitoring AC power plug
Disclosed is an electronic circuit assembled onto a miniature printed circuit board and assembled into an AC plug body such that the AC mains connect to terminals on or connected to the printed...
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6433557 |
Electrical system with capacitance tap and sensor for on-line monitoring the state of high-voltage insulation and remote monitoring device
A sensor and associated circuits are provided for on-line monitoring of the state of the high-voltage insulation in electrical equipment with capacitance tap. In this arrangement, both the power...
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6377054 |
Test device for electrical voltages with integrated illumination unit
A test device is described for testing an electromagnetic quantity, such as a voltage or a magnetic field. The test device includes a housing, a sensor arranged in the housing and sensing the...
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6313642 |
Apparatus and method for testing an arcing fault detection system
A system for testing an arcing fault detection system in an electrical distribution network having a line conductor carrying an electrical signal between a power source and a load, the arcing fault...
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6313639 |
Method and configuration for identifying short circuits in low-voltage networks
A method for identifying short circuits in a low-voltage network includes the step of determining a first envelope and a second envelope for a plurality of locus curves of a current steepness as a...
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6297642 |
Partial discharge detection method
An electromagnetic waveform developing in synchronism with a system power supply by a partial discharge of electric equipment such as a power distribution device is received by an antenna 1. From...
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6208149 |
Method and apparatus for monitoring electric insulation conditions in energized electric systems
A method and an apparatus for monitoring conditions of electric insulation in a live or energized electric system. The invention takes into account the fact that, when the insulation resistance of...
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6140929 |
Self-testing grounding device
A resistance tester is incorporated into a grounding device. The resistance tester includes a test circuit, a battery, a switch and a set of indicator devices. With the grounding device being worn...
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6081122 |
Electrical ground fault detection apparatus
A ground detection apparatus for sensing the presence of a malfunction within an electronic instrument. The apparatus includes an active electrical circuit for delivering electrical energy from a...
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6011398 |
Current-leakage tester
A leakage tester includes multiple circuits capable of simulating the impedance of the human body to electrical current under a variety of conditions, and in which the multiple circuits can be...
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6005393 |
Method of determining an earth-fault current
A method of determining the ground-fault current flowing in a multi-phase circuit is based on the use of standard current transformers having iron cores for the phase conductors and the neutral...
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5977662 |
Electronic switching device and circuits with a plurality of such switching devices
An electronic proximity switching device with a proximity indicator and with an electronic switch which can be controlled by the proximity indicator. A plurality of these switching devices can be...
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5969626 |
ESD ground monitor for electrostatic safe work tables
A device and method for monitoring the integrity of a ground connection between an electrostatic apparatus and earth ground. The device and method provide for continuous monitoring of the...
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5909181 |
Method and apparatus for indicating electrical connection
A ground and bond detection device for ensuring that a conductive material, such at a metal container, is properly grounded to prevent electrostatic charge buildup. The device indicates whether a...
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5872455 |
Wrist strap test mode circuitry
Improved electronic circuitry incorporated into a tag attached to a user worn wrist strap of a static electrical discharge dissipation system. The electronic circuitry monitors the electrical...
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5818236 |
Method and apparatus for checking insulation of ungrounded power source
An apparatus includes an insulated first switching element and a capacitor which are connected in series between one of positive and negative main circuit wirings connected to an ungrounded power...
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5814996 |
Leakage detector having shielded contacts
The noise received by the unused connectors limits the accuracy of a device for measuring the leakage from a piece of electronic medical equipment. To reduce noise the device is surrounded by a...
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