Patent application number | Description | Published |
20080258600 | High-Frequency, High-Voltage Electron Switch - A high-frequency, high-voltage electron switch includes an electron source, a steering mechanism, a mask or anode plate, and a target. The electron source produces a beam of electrons with a voltage of at least about 1 kV that impinges upon the anode plate. The steering mechanism scans the electron beam across the anode plate at a scanning frequency of at least about 10 MHz. A hole or aperture is provided in the anode plate that allows the electron beam to pass through and produce a pulsed, high-voltage current in the target with a very high-frequency repetition rate and a very fast rise time. The pulsed, high-voltage current produced in the target can be used to cause a high-voltage source to turn on and off. | 10-23-2008 |
20090059449 | Series arc fault current interrupters and methods - A circuit interrupter for interrupting current on a line conductor is provided. The circuit interrupter includes separable contacts, a trip mechanism, a bimetal, a microprocessor, a series arc detection sequence, a low-pass filter circuit, and a high-pass filter circuit. The trip mechanism selectively opens the separable contacts when activated. The series arc detection sequence is resident on the microprocessor and includes a plurality of series fault detection algorithms. The low-pass filter circuit provides a low-pass signal to the series arc detection sequence. The high-pass filter circuit provides a high-pass signal to the series arc detection sequence. The sequence selects a particular algorithm from the plurality of algorithms based on the low-pass signal. The sequence calculates a plurality of statistical features from the high-pass signal and sends an output signal to activate the trip mechanism based on a comparison of the plurality of statistical features to the particular algorithm. | 03-05-2009 |
20100089159 | ELECTRONIC STATOR END WINDING ACCELEROMETER SENSOR - An insulated accelerometer assembly is provided for attachment to a vibrated component. A base has a portion for engagement and connection with the vibrated component and to transmit vibration. An accelerometer senses vibration and is located at least partially within the base. A housing at least partially encloses the accelerometer and inhibits voltage discharge, corona damage, and voltage tracking on the accelerometer. The housing is made of an insulating material and has an interior for the accelerometer. The housing has a plurality of raised fins on the exterior. A mounting cap also inhibits voltage discharge, corona damage, and voltage tracking and secures the housing. The mounting cap is made of insulating material and has an exterior that includes a plurality of raised fins. A cable has an electrically conductive wire and has a shield to inhibit electrical noise. | 04-15-2010 |
20100141294 | WINDING DIAGNOSTIC SYSTEM AND METHOD - A winding diagnostic system is provided. The system includes a core having a winding to generate a magnetic flux. A retention device for holding the winding in place is provided. The system further includes a sensor disposed in a sensing relation with the retention device to generate signals related to at least one aspect of the winding. | 06-10-2010 |
20100148907 | CURRENT TRANSFORMER AND ELECTRICAL MONITORING SYSTEM - A current transformer comprises a magnetic core having a closed central opening, at least two conductors extending through the central opening and positioned symmetrically within the magnetic core, and at least one set of winding turns wound around the core in a balanced configuration with respect to the at least two conductors. | 06-17-2010 |
20100277836 | SMART CAPACITOR - A smart capacitor includes a main capacitor having at least one intelligence mechanism selected from a prognostics mechanism and a high speed protection mechanism integrated within the main capacitor. The at least one intelligence mechanism and the main capacitor are together configured to generate at least one type of output signal selected from long term induced failure mechanism signals and sudden capacitor failure condition signals in response to desired input signals. | 11-04-2010 |
20100315095 | CURRENT TRANSFORMER AND ELECTRICAL MONITORING SYSTEM - A current transformer comprises a magnetic core having a closed central opening, at least two conductors extending through the central opening and positioned symmetrically within the magnetic core, and at least one set of winding turns wound around the core in a balanced configuration with respect to the at least two conductors. | 12-16-2010 |
20110006755 | 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 of conductors extending through the central opening and positioned symmetrically with respect to a center point of the inner magnetic core, and one or more coils disposed on the inner magnetic core, the outer sense core, or both, in a magnetically balanced configuration relative to a magnetic neutral axis of the inner magnetic core. | 01-13-2011 |
20110006802 | HIGH SENSITIVITY DIFFERENTIAL CURRENT TRANSFORMER FOR INSULATION HEALTH MONITORING - A current transformer is provided. The current transformer comprises a magnetic core having a central opening, at least one pair of conductors extending through the central opening and positioned symmetrically with respect to a center point of the magnetic core, one or more coils disposed on the magnetic core along a magnetic neutral axis of the magnetic core and one or more coils disposed on the magnetic core along a reference axis, wherein the reference axis is substantially perpendicular to the magnetic neutral axis. | 01-13-2011 |
20110241695 | METHODS AND SYSTEMS FOR MONITORING CAPACITOR BANKS - A method of monitoring a capacitor bank comprising a plurality of capacitor strings connected in parallel, each capacitor string comprising a plurality of capacitors connected in series is provided. The method includes energizing the capacitor bank. The method includes determining dissipation factors of each of the plurality of the capacitor strings. The method further includes comparing each of the determined dissipation factors with an expected dissipation factor and estimating a health state of the plurality of the capacitor strings based, at least in part, on the comparison of the determined and expected dissipation factors. | 10-06-2011 |
20110296989 | CONTROL OF GROUNDED SURFACE GEOMETRY IN ELECTROSTATICALLY ENHANCED FABRIC FILTERS - An electrostatic filter assembly configured to be installed in equipment for removing particulate matter entrained within a gas stream. The filter assembly functions in the removal and collection of the particulate matter from the gas stream. The equipment for removing particulate matter includes a high voltage discharge electrode for imparting an electric charge to the particulate matter whereby an electrical field is produced at the filter assembly. The filter assembly includes a filter element and a supporting structure for the filter element. The supporting structure is configured to establish at the filter assembly, under the operating conditions of the equipment for removing particulate matter, an electrical field having an intensity that produces no more than a selected amount of degradation at the filter element during operation of the equipment for removing particulate matter. Also a method of manufacturing such an electrostatic filter assembly. | 12-08-2011 |
20120280699 | PARTIAL DISCHARGE ANALYSIS COUPLING DEVICE - A partial discharge analysis (PDA) coupling device is provided. In one embodiment, a device includes: a connector electrically connecting a first coupling capacitor and a second coupling capacitor; a first conductive rod for electrically connecting the first coupling capacitor to a high voltage input; a second conductive rod for electrically connecting the second coupling capacitor to ground; a current transformer substantially surrounding a portion of the second conductive rod, the current transformer configured to generate a pulse signal; and a reference signal generator adjacent to the current transformer configured to generate a reference signal in phase with the pulse signal. | 11-08-2012 |
20130049733 | FAULT DETECTION BASED ON CURRENT SIGNATURE ANALYSIS FOR A GENERATOR - A method of detecting faults in a wind turbine generator based on current signature analysis is disclosed herein. The method includes acquiring a set of electrical signals representative of an operating condition of a generator. Further, the electrical signals are processed to generate a normalized spectrum of electrical signals. A fault related to a gearbox or bearing or any other component associated with the generator is detected based on analyzing the current spectrum. | 02-28-2013 |
20130054160 | SYSTEMS AND METHODS FOR MONITORING THE HEALTH OF AN ELECTRICAL SYSTEM - The subject matter herein generally relates to electrical generators and motors, and more specifically, to electrical turbo-generators. In an embodiment, an electrical system includes a circuit. The circuit includes one or more rotating power delivery assemblies comprising a plurality of sliding surfaces that deliver power to a rotating load. The circuit also includes one or more radio frequency current transformers (RFCTs) that measure radio frequency (RF) signals corresponding to arcing events in the one or more rotating power delivery assemblies. The electrical system also includes a processor that receives the measurements from the one or more RFCTs and determines a health value of the circuit based, at least in part, on the received measurements. | 02-28-2013 |
20130076389 | CURRENT TRANSFORMER ASSEMBLY FOR USE WITH ELECTRICAL MONITORING SYSTEMS AND METHODS OF ASSEMBLING SAME - A current transformer assembly for use in an electrical monitoring system is described herein. The current transformer assembly includes a housing including a plurality of shielding members that at least partially define a cavity therein. The housing further includes an inner surface that defines an opening that extends therethough. A first current transformer is positioned within the housing. A second current transformer is positioned within the housing and is spaced a distance from the first current transformer to facilitate reducing electronic noise interference between the first and second current transformers. | 03-28-2013 |
20130173183 | COLLECTOR MONITORING SYSTEM - A collector monitoring system is disclosed. In one embodiment, the collector monitoring system includes: a sensor connected to an interior surface of a dynamoelectric machine housing, the sensor for sensing a condition of a collector during operation of a dynamoelectric machine; and a diagnostic system operably connected to the sensor, the diagnostic system configured to: obtain data about the condition of the collector from the sensor; compare the data about the condition of the collector with a predetermined condition threshold; and provide an indicator of a collector fault in response to the data about the condition of the collector exceeding the predetermined condition threshold. | 07-04-2013 |
20130234722 | 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 of conductors extending through the central opening and positioned symmetrically with respect to a center point of the inner magnetic core, and one or more coils disposed on the inner magnetic core, the outer sense core, or both, in a magnetically balanced configuration relative to a magnetic neutral axis of the inner magnetic core | 09-12-2013 |
20140084937 | On-Line Monitoring of Stator Insulation in Motors and Generators - Systems and methods are disclosed for on-line monitoring of the condition of the stator insulation of an AC motor or an electric generator. In certain embodiments, the system includes a transformer surrounding each pair of input and output cables associated with a given phase of power provided to the AC motor or generated by the electric generator. In another embodiment, a transformer surrounds the three input cables (for an AC motor) or the three output cables (for an electric generator) that correspond to phases of the AC motor or electric generator. In both embodiments, the transformers generate voltages that may be used to monitor leakage currents associated with the cables. A microcontroller monitors the voltages generated by the transformers and determines the condition of the stator insulation of the AC motor or the electric generator based on the voltages. | 03-27-2014 |