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Electric Power Research Institute, Inc. Patents
Assignee:
Electric Power Research Institute, Inc.
Address:
Palo Alto, CA
No. of patents:
660
Patents:


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Patent Number Title Of Patent Date Issued
RE34055 Vertically tiered particle filtering apparatus September 8, 1992
An apparatus especially suitable for filtering out a particulate material from a carrier fluid such as flue gases is disclosed herein. This assembly utilizes a main vessel defining an interior compartment and having an inlet and separate outlet. A number of filter assemblies are disposed
8575942 Non-contacting method and apparatus for determining contact voltage sources and providing a warn November 5, 2013
This invention relates to non-contact measurement methods and an apparatus for the identification of hazardous contact voltages on energized objects and surfaces. The apparatus includes an electric field sensor structured to sense an electric field and a gain amplifier electrically c
8241398 Method and apparatus for the enhanced removal of aerosols and vapor phase contaminants from a ga August 14, 2012
The invention provides methods and apparatuses for removing aerosols and, in some cases, vapor phase contaminants, such as mercury, from a gas stream. One method is directed to the removal of additional aerosols from a gas stream from which aerosols have previously been removed by using
8204632 Emergency frequency load shedding scheme June 19, 2012
A load shedding system and method for controlling imbalances in a power system includes a signal generator adapted to generate a signal representative of a local system, and a modifying circuit adapted to adjust set frequencies. The system also includes a processing circuit adapted t
8182776 Process for operating a fossil fuel fired power plant May 22, 2012
An integrated process for operating a fossil fuel fired power plant including: producing hydrogen gas and an aqueous solution of hydrogen peroxide via a process including: dissociating hydrogen gas and oxygen gas from water; pressurizing the hydrogen gas and the oxygen gas; and mixin
8165261 Chemical enhancement of ultrasonic fuel cleaning April 24, 2012
A method for cleaning an irradiated nuclear fuel assembly includes chemically enhancing a technique utilizing an apparatus including a housing adapted to engage a nuclear fuel assembly. A set of ultrasonic transducers is positioned on the housing to supply radially emanating omnidire
8126667 Measurement based voltage stability monitoring and control February 28, 2012
A measurement base voltage stability monitoring and control scheme having a means for measuring current and voltage phasors at a boundary bus of a load center; and an equivalent network having a fictitious bus with an aggregate load representative of all loads of the load center. The sch
8097164 Process for preparing magnetic particles for selectively removing contaminants from solution January 17, 2012
A process for selectively removing contaminant ions from a solution includes: a) contacting the solution with magnetic particles coupled to selectively chelating ion exchange functionality containing moieties prepared by: i) activating carboxyl groups on the selectively chelating
8029600 Sorbent filter for the removal of vapor phase contaminants October 4, 2011
Methods and apparatuses are described for removing a contaminant, such as a vaporous trace metal contaminant like mercury, from a gas stream. In one embodiment, a primary particulate collection device that removes particulate matter is used. In this embodiment, a sorbent filter is pl
7850764 Reactive membrane process for the removal of vapor phase contaminants December 14, 2010
Generally, the present invention provides a method and apparatus for removing a vapor phase contaminant from a gas stream, thereby reducing the concentration of the vapor phase contaminant in the gas stream. In one embodiment, the present invention provides a method for removing a va
7806010 Test port assembly for allowing a test probe to be inserted into a conduit October 5, 2010
This invention relates to a rotating test port assembly for measuring air flow and particulate matter in conduits. The test port assembly includes a first end section, a second end section, and a rotating section adapted for rotation between the first and second end sections. The assembl
7731781 Method and apparatus for the enhanced removal of aerosols and vapor phase contaminants from a ga June 8, 2010
The invention provides methods and apparatuses for removing aerosols and, in some cases, vapor phase contaminants, such as mercury, from a gas stream. One method is directed to the removal of additional aerosols from a gas stream from which aerosols have previously been removed by using
7708803 Method and apparatus for the enhanced removal of aerosols from a gas stream May 4, 2010
The invention provides methods and apparatuses for removing additional aerosols and in some cases additional particulate matter from a gas stream, wherein a certain portion of such aerosols and particulate matter has already been removed using a primary aerosol and particulate collec
7701087 Integrated closed loop control method and apparatus for combined uninterruptible power supply an April 20, 2010
The present invention provides a method, computer program product, and apparatus and control system and method for providing substantially uninterrupted power to a load. The apparatus includes a control system coupled with an electrical power storage subsystem and a electrical power
7654160 Sampling probe enabling the measurement of gaseous species in particle-laden flue gas February 2, 2010
A sampling probe for enabling the analysis of gaseous species in a particle-laden flue gas. The sampling probe includes a tube for being inserted into a fluid stream of a particle-laden flue gas substantially perpendicular thereto to cause the fluid stream to separate and flow around
7617603 Method for inspection and repair November 17, 2009
A method for the inspection and repair of a tube includes electrical discharge machining an access hole into the tube, optionally at or near the uppermost location on the tube, near the upper header; performing inspection of the tube, optionally using a visual or an eddy current insp
7603203 Method for voltage instability load shedding using local measurements October 13, 2009
A method of voltage instability load shedding, that includes the steps of measuring current and voltage waveforms of an electrical system at a local bus estimating the Thevenin equivalent admittance based on Kalman Filter techniques, then a voltage stability margin index is calculated
7591410 Methods for extending the life of alloy steel welded joints by elimination and reduction of the September 22, 2009
In one embodiment, the present invention provides a method for welding together two metal pieces, comprising buttering a surface of a first metal piece with a first nickel-based filler metal at a thickness sufficient to isolate a heat-affected zone in the first metal piece from subse
7547859 Method for repairing heat recovery steam generator tube-to-header damage June 16, 2009
A method for repairing a heat recovery steam generator (HSRG) header to tube attachment damage, includes providing an access window in the header opposite the damaged header to tube attachment location; removing the header to tube attachment damage; inserting a tapered stub tube into a
7542539 Apparatus and method for ultrasonically cleaning irradiated nuclear fuel assemblies June 2, 2009
An apparatus for cleaning an irradiated nuclear fuel assembly includes a housing adapted to engage a nuclear fuel assembly. A set of ultrasonic transducers is positioned on the housing to supply radially emanating omnidirectional ultrasonic energy to remove deposits from the nuclear
7518266 Method and apparatus for improving AC transmission system dispatchability, system stability, and April 14, 2009
An electric power transmission system that isolates a local AC transmission network from a surrounding AC system includes a local AC load center having a plurality of local AC loads, and a distribution feeder serving the plurality of local AC loads and at least one distant electric p
7486084 Apparatus and method for identifying the presence of high conductivity or permittivity condition February 3, 2009
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 placed in spaced-apart relation on an insulator to be tested for a high conductivity or
7484955 Method for controlling air distribution in a cyclone furnace February 3, 2009
Methods for cyclone boiler flame diagnostics and control, including methods for monitoring the operating state of a cyclone furnace using linear and nonlinear signal analysis techniques, including temporal irreversibility and symbol sequence. Adjustments may be made in the air flow d
7484651 Method to join or repair superalloy hot section turbine components using hot isostatic processin February 3, 2009
Accordingly, the present invention provides a method for joining metallic members, which can be used to join component sub-assemblies. Further, the present invention provides a method for repairing a component by replacing a damaged portion and re-inserting a replacement section. In
7416646 Fly ash treatment by in situ ozone generation employing a venturi August 26, 2008
Disclosed is a method of treating, fly ash having an unacceptably high concentration of carbon, with ozone produced in situ by corona discharge. This method will allow high carbon-content fly ash to be used with air entrainment agents as an additive to cement. The corona discharge can be
7413593 Polarity reversing circuit for electrostatic precipitator systems August 19, 2008
A gas separation apparatus using electrostatic precipitators and mechanical rappers is enhanced by the addition of an opposite polarity refreshing power supply and a switching arrangement. The switching components selectively disconnect the primary power supply and connect the refres
7405910 Multifunction hybrid solid-state switchgear July 29, 2008
A universal hybrid solid-state switchgear for power transmission or distribution systems incorporates a fast mechanical switch and solid-state power electronics switching circuits to provide circuit breaker and fault current limiting applications.
7392585 Method for electrically and mechanically connecting and disconnecting a power line July 1, 2008
The present invention provides an apparatus for connecting two pairs of conductors and one pair of ground wires and for allowing separation of the same upon the application of a tensional force upon at least one of the conductors or ground wires. The apparatus comprises two plates that
7388369 Method and apparatus for measuring hydrogen concentration in zirconium alloy components in the f June 17, 2008
The present invention provides a method for measuring hydrogen concentration in an electrically conductive material, such as a nuclear fuel rod, comprising calibrating an eddy current probe at a plurality of hydrogen concentrations; measuring eddy currents at a plurality of positions
7371988 Methods for extending the life of alloy steel welded joints by elimination and reduction of the May 13, 2008
In one embodiment, the present invention provides a method for welding together two metal pieces, comprising buttering a surface of a first metal piece with a first nickel-based filler metal at a thickness sufficient to isolate a heat-affected zone in the first metal piece from subse
7353140 Methods for monitoring and controlling boiler flames April 1, 2008
The current invention provides a method and apparatus, which uses symbol sequence techniques, temporal irreversibility, and/or cluster analysis to monitor the operating state of individual burner flames on a appropriate time scale. Both the method and apparatus of the present invention m
7306774 Reactive membrane process for the removal of vapor phase contaminants December 11, 2007
Generally, the present invention provides a method and apparatus for removing a vapor phase contaminant from a gas stream, thereby reducing the concentration of the vapor phase contaminant in the gas stream. In one embodiment, the present invention provides a method for removing a va
7141091 Method and apparatus for removing particulate and vapor phase contaminants from a gas stream November 28, 2006
The present invention provides methods for removing particulate and a vapor phase contaminant from a gas stream including, in one embodiment, directing a gas stream comprising fly ash and a vapor phase contaminant into a particulate collection device, wherein the particulate collection
7053625 Method and apparatus for detecting wear in components of high voltage electrical equipment May 30, 2006
A tracer material is embedded in a component of electrical equipment to detect excessive wear of the component when it is exposed to an electrical arc. As the component wears, the tracer material becomes exposed to the electrical arc and emits electromagnetic radiation, which is moni
7050311 Multilevel converter based intelligent universal transformer May 23, 2006
A multilevel converter-based, intelligent, universal transformer includes back-to-back, interconnected, multi-level converters coupled to a switched inverter circuit via a high-frequency transformer. The input of the universal transformer can be coupled to a high-voltage distribution
6971898 Apparatus and method for electrically and mechanically connecting and disconnecting a power line December 6, 2005
An apparatus for connecting two pairs of conductors and one pair of ground wires and for allowing separation of the same upon the application of a tensional force upon at least one of the conductors or ground wires. The apparatus includes two plates that each defines three holes configur
6953520 Capillary electrophoresis probes and method October 11, 2005
A novel class of capillary electrophoresis probes and a method of employing the same are described. The novel class of capillary electrophoresis probes are comprised of one or more vinylogous carboxylic acid compounds or their derivatives. In another aspect of the present invention, a me
6905534 Method and apparatus for removing vapor phase contaminants from a flue gas stream June 14, 2005
The present invention provides a method and apparatus for removing trace contaminants from a gas stream or flue gas. In one embodiment, the present invention an apparatus for removing a trace contaminant from a gas stream, comprising a gas duct configured to receive a gas stream comprisi
6901351 Application of symbol sequence analysis and temporal irreversibility to monitoring and controlli May 31, 2005
The current invention provides a method and apparatus, which uses symbol sequence techniques and/or temporal irreversibility derived from chaos theory to monitor the operating state of individual burner flames on a appropriate time scale. Both the method and apparatus of the present
6884959 Controlled composition welding method April 26, 2005
This invention relates to a method and apparatus for controlling the composition of a weld. More particularly it relates to welding using an electric circuit, thereby creating a weld puddle, and adding at least one filler that is electrically independent from the electric circuit to the
6873746 Apparatus and method for monitoring a cable March 29, 2005
In one embodiment the present invention provides a device for monitoring a cable, comprising an imaging device having a field of view; a target, distinguishable within the field of view of the imaging device, associated with a cable; and a computer processor connected to the imaging devi
6865410 Apparatus and method for measuring current flow in an animal or human body March 8, 2005
An apparatus for measuring contact current includes data acquisition circuitry with at least two sensor contacts to measure the voltage drop across an animal or human body. A portable data processing unit is connected to the data acquisition circuitry to process the voltage data to p
6818043 Vapor-phase contaminant removal by injection of fine sorbent slurries November 16, 2004
A method for efficiently removing vapor-phase contaminants from gas streams is described. A powdered adsorbent such as activated carbon is ground into a fine powder by wet grinding to form a slurry. Chemicals are added to the slurry to impregnate the sorbent to enhance sorbent effectiven
6795801 Apparatus and method for analyzing anisotropic particle scattering in three-dimensional geometri September 21, 2004
The disclosed method, a technique for analyzing anisotropic particle scattering, includes the step of establishing a three-dimensional geometric representation of an object. A set of rays is then projected through the three-dimensional geometric representation to produce simulated an
6777948 Method and apparatus for detecting wear in components of high voltage electrical equipment August 17, 2004
A tracer material is embedded in a component of electrical equipment to detect excessive wear of the component when it is exposed to an electrical arc. As the component wears, the tracer material becomes exposed to the electrical arc and emits electromagnetic radiation, which is monitore
6775645 Application of symbol sequence analysis and temporal irreversibility to monitoring and controlli August 10, 2004
The current invention provides a method and apparatus, which uses symbol sequence techniques and/or temporal irreversibility derived from chaos theory to monitor the operating state of individual burner flames on a appropriate time scale. Both the method and apparatus of the present
6736011 Inspection of shrunk-on steam turbine disks using advanced ultrasonic techniques May 18, 2004
A method of ultrasonically testing the disk bore and keyway area of a shrunk-on steam turbine rotor disk or hub is provided. The method employs a one or more scanning ultrasonic phased linear array probes mounted on the disk to inspect the disk bore and keyway area on the opposite side o
6712878 Method and apparatus for renewable mercury sorption March 30, 2004
A method of removing trace contaminants, such as mercury, from a flue gas by passing the gas over a sorbent structure on which is coated a renewable layer of sorbent. The sorbent structure can be a tube or plate and can be porous or non-porous and is placed inside a duct through which th
6710994 Low power gate trigger circuit for controlling a silicon-controlled rectifier circuit March 23, 2004
A circuit for controlling a silicon-controlled rectifier includes a high breakdown voltage metal-oxide semiconductor field-effect transistor (MOSFET) connected to drive the gate of the silicon-controlled rectifier. The high breakdown voltage MOSFET is itself controlled by a gate voltage.
6706344 Controlled fumigation of wooden structures March 16, 2004
The present invention provides an apparatus and method for controlled release of a fumigant into a wooden structure to prevent decay of that structure. According to the present invention, a fumigant in an ampule or container is inserted into the wooden structure. The ampule or container
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