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公开(公告)号：US10775332B2
公开(公告)日：2020-09-15
申请号：US15311055
申请日：2015-05-13
IPC分类号： G01N27/02 , G01N33/38 , C04B40/00 , G01M5/00 , G01R27/16 , C04B111/00 , C04B111/92
摘要： Concrete can be one of the most durable building materials and structures made of concrete can have a long service life. Consumption is projected to reach approximately 40 billion tons in 2017. Despite this the testing of concrete at all stages of its life cycle is still in its early stages although testing for corrosion is well established. Further many of the tests today are time consuming, expensive, and provide results only after it has been poured and set. Embodiments of the invention provide concrete suppliers, construction companies, regulators, architects, and others with rapid testing and performance data regarding the cure, performance, corrosion of concrete at different points in its life cycle based upon a simple electrical tests that remove subjectivity, allow for rapid assessment, are integrable to the construction process, and provided full life cycle assessment. Wireless sensors can be embedded from initial loading through post-cure into service life.
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32.发明申请公开(公告)号：US20200241059A1
公开(公告)日：2020-07-30
申请号：US16637301
申请日：2018-07-31
申请人： LEONI KABEL GMBH
发明人： SERGEY INTELMAN
IPC分类号： G01R27/16 , G01R27/04 , G01R23/163
摘要： The invention relates to a device for determining a temperature-dependent impedance curve along an electrical conductor, which device has a signal generator unit, which is arranged and designed to generate a multi-frequency electrical signal, which passes through an electrical conductor. The device also has a frequency spectrum sensing unit, which is arranged and designed to sense a frequency spectrum of a multi-frequency electrical signal leaving the conductor at least in a predefined frequency range. The device also has a frequency spectrum difference determination unit, which is arranged and designed to determine a frequency difference between the sensed frequency spectrum and a predefined frequency spectrum. The device also has a frequency difference conversion unit, which is designed and arranged to determine an amplitude curve of the determined frequency difference along the electrical conductor.
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公开(公告)号：US10724977B2
公开(公告)日：2020-07-28
申请号：US16459329
申请日：2019-07-01
申请人： Itron, Inc.
IPC分类号： G01N27/02 , G01R19/25 , G06Q50/06 , G01R27/16 , G01R31/08 , G06Q10/06 , G01R22/06 , G01R27/08 , H02J3/00
摘要： Techniques for detecting high impedance conditions in an electrical grid are described herein. In one example, impedance is calculated for each of a plurality of locations within the electrical grid, such as at electrical meters. The impedances may be calculated as a change in voltage divided by a change in current, such as between sequential voltage/current measurements. Statistics may be maintained, including the calculated impedances. In three examples, statistics may be used to identify growth in impedance over multiple days, to identify growth in impedance over multiple hours, and to identify a meter for which impedance is higher than impedance for other meters attached to a single transformer. In a further example, instances of impedance over a threshold value may be identified, from among the maintained statistics. The instances of high impedance may be reported for reasons including cost and safety.
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公开(公告)号：US10698007B2
公开(公告)日：2020-06-30
申请号：US15612550
申请日：2017-06-02
申请人： NXP B.V.
发明人： Fred Mostert , Gertjan van Holland , Paul Wielage
IPC分类号： G01R17/02 , H03F3/217 , H04R3/00 , G01R31/28 , H03F3/181 , H03M1/12 , G01R27/16 , H03M1/66 , G01R31/00
摘要： A method and apparatus of load detection for an audio amplifier system is described. A load detector includes a first load terminal and a second load terminal; a controller coupled to the first and second load terminals and configured to in a first control loop, vary a first current supplied to a first load terminal dependent on the difference between a first reference signal and the detected first load terminal voltage; and in a second control loop, vary a second current supplied to the second load terminal dependent on the difference between a second reference signal and the detected second load terminal voltage; and to determine a current through a load connected between the first load terminal and the second load terminal from the second current value, and a voltage across the load from the detected voltage difference between the first load terminal voltage and the second load terminal voltage.
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公开(公告)号：US10547958B2
公开(公告)日：2020-01-28
申请号：US15963127
申请日：2018-04-26
发明人： Michael Klose
摘要： The invention relates to a sound reproduction device which comprises a signal source, a power source, an amplifier, and a loudspeaker. The sound reproduction device further comprises an impedance measuring device and an analysis device. The impedance measuring device is connected to loudspeaker leads of the loudspeaker in order to measure impedance values, and the impedance measuring device is connected to the analysis device in order to forward the measurement results. The analysis device is also connected to the signal source and/or to the amplifier in order to adapt a signal fed to the loudspeaker.
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公开(公告)号：US10528112B2
公开(公告)日：2020-01-07
申请号：US15684999
申请日：2017-08-24
申请人： Microsemi P.O.E Ltd.
发明人： Yair Darshan
IPC分类号： G06F1/3209 , H04L12/40 , G06F1/26 , G06F1/3206 , G01R27/16 , G05F1/70 , G05F3/30 , H02J3/02 , H04L12/10
摘要： An MPS generation method, the method constituted of: at a predetermined frequency, alternately outputting a first MPS current pulse for a predetermined first time period and not outputting the first MPS current pulse for a predetermined first off time period; during the first time period, determining the magnitude of a current drawn by an input capacitor of a DC to DC converter; and responsive to the determined input capacitor current magnitude, outputting between the first terminal and the second terminal a second MPS current pulse for a predetermined second time period during the predetermined first off time period.
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公开(公告)号：US20190391191A1
公开(公告)日：2019-12-26
申请号：US16315665
申请日：2016-07-08
申请人： ABB Schweiz AG
摘要： A method and system is provided for locating a fault in a mixed power transmission line. The method is implemented by an Intelligent Electronic Device (IED) of the mixed line. The IED detects a travelling wave from one or more signals received from one or more measurement equipment. Thereafter, the IED identifies a line section with the fault, and generates two or more estimates for the location of the fault based on a time difference between arrival of two peaks of the travelling wave, a velocity of propagation of the travelling wave in the line section identified with the fault, and a length of one or more line sections. The IED determines the location of the fault based on a comparison of each estimate with a threshold, wherein the threshold is estimated based on the one or more signals, equivalent source impedance of each source and total line impedance.
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38.发明授权公开(公告)号：US10367410B2
公开(公告)日：2019-07-30
申请号：US14914957
申请日：2014-07-07
申请人： Yushan Hao
发明人： Yushan Hao
摘要： The invention discloses a method and system for identifying an element parameter and a power correction factor of an electric power system. The method comprises: inputting an active power telemetering steady state value {circumflex over (P)}, a reactive power telemetering steady state value {circumflex over (Q)}, and a voltage telemetering state value Û of a power grid with n elements, to establish P+jQ={circumflex over (P)}+j{circumflex over (Q)}+G(β,{circumflex over (P)},{circumflex over (Q)}) for telemetering power, where G(β,{circumflex over (P)},{circumflex over (Q)}) is power correction function regarding {circumflex over (P)} and {circumflex over (Q)}, and β is power correction factor; establishing F(Y,P,Q,Û)=0, where Y is an admittance matrix of the n elements; setting F(Y,P,Q,Û)=ε and J=εT·ε, minimizing J, and determining Y and β; restoring element parameters including resistance R, reactance X and susceptance B from Y; and outputting R,X,B and β. The method can identify element parameters and power correction factor with high identification accuracy improve qualified rate of state estimation and improve accuracy of applications such as stability analysis, stability checking and stability control, etc.
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公开(公告)号：US20190212374A1
公开(公告)日：2019-07-11
申请号：US15865456
申请日：2018-01-09
申请人： Eurotherm Limited
发明人： Remi CABAUSSEL , Loris MORASSUTTO
CPC分类号： G01R21/1331 , G01R27/08 , G01R27/16 , G01R29/16 , H02M1/4216 , H02M5/14 , H02M5/4585 , H02M7/23 , H02P23/14
摘要： In accordance with an example embodiment of the invention, a three-phase power control device is configured to synchronize firing thyristor or SCR sets in consecutive combinations of two of the three phases, to supply current to consecutive combinations of two of the three loads in a three-phase load configuration, to determine real branch impedance of each load from three combinations of two supplied loads, without need of any electrical neutral reference.
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公开(公告)号：US10348065B1
公开(公告)日：2019-07-09
申请号：US15233533
申请日：2016-08-10
发明人： Alan A. Libby
摘要： A method of connecting electrical substation wiring in an electrical substation provides pre-bundled yard cables configured to connect between field devices in the substation and a yard interface connection cabinet. The yard interface connection cabinet has an outside plug bulkhead plate that is accessible from outside of a control house that houses the yard interface connection cabinet. The outside plug bulkhead plate has a plurality of connectors configured to mate with the yard cables. The yard interface connection cabinet further has internal wires extending from an inside plug bulkhead plate and terminating at a terminal block. The connections and wires in the yard interface connection cabinet are tested with the yard cables before installation of the yard interface connection cabinet and yard cables in the substation. The yard cables are connected between the field devices and the outside plug bulkhead plate from outside of the control house.
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