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7623041 |
Portable partial discharge detection apparatus and method thereof
A portable partial discharge detection apparatus and method thereof are provided. The portable partial discharge detection apparatus includes a detection unit, a control unit and an alarm unit. The...
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7602194 |
Apparatus and method of water absorption test for generator stator winding insulator using cross capacitance
A method of water absorption for a generator stator winding insulator using a cross capacitance involves detecting a state of the insulator of the stator winding of the generator using a theory of...
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7595644 |
Power-over-ethernet isolation loss detector
An AC generator has a first terminal coupled through an Isolation Loss Detect (ILD) capacitor to the positive bus of a Power-Over-Ethernet (POE) system, and has a second terminal coupled through...
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7579843 |
Methods and apparatus for analyzing partial discharge in electrical machinery
Methods and apparatus for analyzing electrical insulation of an electrical machine are provided. The method includes receiving a first signal that includes a plurality of partial discharge pulses...
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7554336 |
Method for measuring the insulation resistance in an IT network
A method for measuring the insulation resistance in an information technology (IT) network. The IT network has a DC voltage intermediate circuit and at least one self-commutated converter having at...
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7486084 |
Apparatus and method for identifying the presence of high conductivity or permittivity conditions in electrically insulating materials
An apparatus and method for detecting the presence of high conductivity or permittivity conditions in electrically insulating materials, including a first electrode and a second electrode for being...
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7348190 |
Method of detecting a defect in a semiconductor device
A method of detecting a defect in a semiconductor device may involve immersing a substrate into a chemical solution. The substrate may support a metal wiring and an insulation layer may cover the...
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7317316 |
Apparatus and method for measuring the insulation resistance of a fuel cell system
A measuring device to measure the insulation resistance (Riso) of a fuel cell system with respect to an electrical ground point comprises a resistor arrangement—formed by a series connection of...
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7292048 |
Method and apparatus for measuring a dielectric response of an electrical insulating system
Method and device for measuring a dielectric response of an electrical insulating system, wherein a first measurement result is determined by a frequency domain method and a second measurement...
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7271598 |
Conductor coil defect identifier
A system and method for detecting a defect in an actuator arm conductor coil is disclosed. An actuator arm including a conductor coil is received. The conductor coil is coupled with a voltage as an...
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7256701 |
Motor driver
A motor driver capable of detecting the insulation deterioration of a motor easily and inexpensively is disclosed. The voltage supplied from an AC power supply ( 1 ) is rectified by a first...
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7253639 |
Insulation resistance deterioration detection method and insulation resistance deterioration detection device for motor, and motor driver
The drive of the motor is stopped, the electromagnetic switch contacts are switched OFF, and thereafter the first and second contact points are closed to form a closed circuit of the smoothing...
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7245976 |
Field apparatus
A field apparatus for controlling a controlled element includes a diagnosis unit for diagnosing abnormality of the field apparatus and/or the controlled element and a bidirectional digital...
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7202672 |
Partial discharge sensor
A RF current transformer sensor includes a first sensor portion and a second sensor portion. The first and second sensor portions are configured to define a fixed opening for receiving a test...
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7183776 |
System and method for performing online partial discharge testing
A partial discharge sensing system and method for conducting testing inside an enclosure includes a partial discharge sensor, an access port, and a signal cable. The partial discharge sensor is...
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7183774 |
Method of detecting partial discharges and diagnostic system for electrical apparatus
The invention provides a method of detecting partial discharges in an electrical appliance insulated in a receptacle and a system of diagnosing the state of the appliance using this method. With...
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7176694 |
Testing device and method of testing insulated handles used for servicing high voltage transmission lines
A hot stick testing apparatus and method including a pair of generally ring-shaped electrodes spaced from one another at a predetermined distance. Each electrode has a central opening configured to...
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7170309 |
TDDB test pattern and method for testing TDDB of MOS capacitor dielectric
A Time Dependent Dielectric Breakdown (TDDB) test pattern circuit, which can reduce testing time and statistically improve a precision of measurement as well as a method for testing the test...
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7167007 |
Apparatus and method for field testing MOV arresters
Embodiments test MOV arresters. One embodiment comprises applying a plurality of voltages to a high voltage lead of the MOV arrester, the plurality of voltages being changed between an initial test...
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7148674 |
Apparatus for automatically measuring a relatively wide range of leakage currents
A leakage current measurement apparatus for measuring leakage currents is disclosed. The leakage current measurement apparatus automatically selects one of non-inductive shunt resistors of 10Ω,...
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7135988 |
Temperature recorder and temperature recording and controlling system for power supply equipment
A temperature recorder capable of storing, in time sequence, measured temperatures and measured times as temperature records in a memory incorporated therein, wherein, the temperature recorder is...
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7135868 |
Method and apparatus for testing gate oxide with fuse
An apparatus and method for testing a dielectric layer. The apparatus includes a first conductive plate and a second conductive plate. The first conductive plate and the second conductive plate are...
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7129710 |
Printed circuit card
A printed circuit card made of plastic has a carbonization sensor for protection against smoldering electrical fires. The carbonization sensor contains a first and a second conductor track disposed...
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7112968 |
Method and apparatus for detecting a partial discharge in a high-voltage transmission and distribution system
A method and an apparatus for detecting a partial discharge in a high-voltage transmission and distribution system include detectors which are respectively attached to a power cable and an antenna,...
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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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7109722 |
Apparatus and method for PCB smoke and burn detection and prevention
An apparatus and method for at least one of detecting and preventing burning of a PCB is disclosed. The method includes configuring a first comb array defined by a plurality of first fingers at a...
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7061253 |
Apparatus and method for field testing polymer insulators
A system and method for testing polymer insulators is provided. One embodiment includes applying a voltage to a grading shield that is oriented about a top region of a polymer insulator and to a...
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7042229 |
System and method for on line monitoring of insulation condition for DC machines
Insulation condition monitoring systems and methods for a rotating DC electric machine, the method comprising: measuring a first set of values for an instantaneous differential current and an...
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7019531 |
Procedure and device for the evaluation of the quality of a cable
A procedure and a system for the evaluation of the quality and/or efficiency of a cable or a cable segment by a current measurement is disclosed. This is achieved by supplying between the core and...
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7013701 |
Inspection method of multilayer gas sensing device
Provided is an inspection method for a multilayer gas sensing device, capable of certainly and easily detecting a defective product originating from faults such as gaps or cracks. For the...
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7012435 |
State detecting method and insulation resistance fall detector
A method of detecting a state of an insulation resistance fall detector that includes: a detection resistance connected in series to an insulation resistance between a vehicle body and a power...
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7005860 |
Insulation resistance drop detector and method of detecting state thereof
An insulation resistance drop detector 50 and a method of detecting a state of malfunction of the detector 50 are provided. When open of a coupling capacitor Co or malfunction of a lowpass...
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6995565 |
Thermographic wiring inspection
A method for inspecting a wire, a cable or a bundle of wires to locate those parts of said wires or cables having damaged insulation before failure of the wire or cable occurs, the method...
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6960915 |
Electric circuit system
An electric circuit system for detecting a short circuit between output PINs of different ICs, particularly CMOS-ICs, which in each case have a first switching element, particularly a highside...
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6937027 |
Hybrid type sensor for detecting high frequency partial discharge
Disclosed herein is a hybrid type sensor for detecting high frequency partial discharge which can detect high frequency partial discharge at a high signal-to-noise ratio without being influenced by...
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6927564 |
Multimeter instrument with touch-sensitive selection device
A multimeter instrument for measuring variables, such as electrical current, voltage, or resistance includes touch-sensitive zones for selection of the variable to be measured. The measurement...
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6927562 |
Power factor/tan δtesting of high voltage bushings on power transformers, current transformers, and circuit breakers
Measurement of power factor to diagnose the condition of high powered stand-off insulators, which include a roll of insulating material carrying an intermediate layer of conductor between layers of...
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6924650 |
Device for generator diagnosis with built-in rotor
In a device for the investigation of components of a generator which border on a machine air gap ( 29 ) between stator and rotor ( 22 ), with the rotor ( 22 ) built in, by means of at least one...
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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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6879164 |
Method and device for insulation monitoring of a DC network
A method and device for insulation monitoring of an electrically insulated DC network by measuring of the insulation resistance using galvanic isolation between a measuring resistor which is...
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6873159 |
Device and method for monitoring a capacitor bushing
The invention relates to a method for monitoring a capacitor bushing ( 1 ) to which an electrical operating voltage (UB) is applied and in which a voltage divider is formed with an electrically...
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6870374 |
Process for identifying abnormalities in power transformers
A preferred method for identifying a type of abnormality in an insulation system of a power transformer comprises measuring dielectric losses in a section of the insulation system, calculating...
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6864688 |
Apparatus and method of monitoring insulation of a DC network that is electrically insulated with respect to the ground potential of a device
Insulation monitoring of an electrical network such as a DC network which is electrically insulated with respect to the ground of a device, includes at least two insulation monitoring devices that...
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6858448 |
Method for evaluating and manufacturing a semiconductor device
A semiconductor device evaluation method includes the steps of measuring a total injected electron quantity before an insulating film causes a dielectric breakdown and obtaining the ratio between...
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6825670 |
Method and device for testing a telecommunication cable
The present invention relates to a method for testing a conductor element ( 20 ) applicable to locating a continuity defect of the conductor element, the conductor element having, relative to a...
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6819076 |
Active EMI filter with magnetoresistive sensor for common mode noise current
A motor drive including an input for alternating current, a rectifier circuit, an inverter, an output which provides the controlled alternating current to drive a motor; and an active EMI filter...
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6806720 |
Method of reliability testing
A method of reliability testing is disclosed. A critical breakdown resistance of a device is determined. The test structure is subjected to stress conditions and electrically tested. The critical...
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6794883 |
Method and system for monitoring winding insulation resistance
A method and system for determining the resistance of a winding insulation. The method includes applying a pulsed voltage having a maximum value and a minimum value to the winding insulation. The...
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6765390 |
Diagnostic wiring verification tester
A tester for verifying the integrity of insulation in a branch circuit of a power distribution system. Two test circuits are included; the first providing an insulation test; and a second, a...
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6753692 |
METHOD AND APPARATUS FOR TESTING SOLAR PANEL, MANUFACTURING METHOD FOR MANUFACTURING THE SOLAR PANEL, METHOD AND APPARATUS FOR INSPECTING SOLAR PANEL GENERATING SYSTEM, INSULATION RESISTANCE MEASURING APPARATUS, AND WITHSTAND VOLTAGE TESTER
A manufacturing method for manufacturing a solar panel including a solar cell and an outer housing and an inspection method for inspecting a solar panel generating system, include a step of...
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