Matches 1 - 35 out of 35


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US20150042093 METHOD FOR AVOIDING VOLTAGE INSTABILITY IN AN ELECTRICAL GRID OF AN OFFSHORE WIND PARK  
Method for avoiding voltage instability in an electrical grid of an offshore wind park, the offshore wind park electrical grid being connected at a first end of a high voltage alternating current...
US20110153244 Individualized self-monitoring system for transformers in power measurement installations and method of self-monitoring and diagnosis of transformers in power measurement installations  
The present invention relates to an individualized self-monitoring system for transformers (31, 33) in a electric power measurement installation that comprises at least a transformer (31, 33) and...
US20110082654 POWER GRID WITH COMPARISON OF DIFFERENCES IN REMOTE PHASOR CHANGES  
The invention compares geographically remote locations on a power grid by determining at each location the amount of change to phasor measurements for a period of time, and then comparing the...
US20110130991 PHASE IDENTIFICATION SYSTEM AND METHOD  
A method to identify phase is presented. The method includes obtaining electrical parameters at a node and a substation of an electrical grid, processing the electrical parameters of the node and...
US20080172195 SEMICONDUCTOR DEVICE, AND TEST CIRCUIT AND TEST METHOD FOR TESTING SEMICONDUCTOR DEVICE  
A semiconductor device includes a CDR (Clock Data Recovery) circuit and a frequency tracking control circuit. The CDR (Clock Data Recovery) circuit executes a clock data recovery on a serial data...
US20100088053 PHASE DETECTION DEVICE AND POSITION DETECTION DEVICE  
Provided is a phase detection device which can detect a phase by using a simple configuration. The phase detection device 5 has the section specifying part 27 specifying which of the eight...
US20130024149 IDENTIFICATION OF ELECTRICAL GRID PHASE INFORMATION FOR END-POINTS IN A GRID NETWORK  
In one embodiment, a requesting device (e.g., head-end application) requests a phase-related response from an end-point that does not know its phase in a polyphase power source system. In...
US20080309946 Differential-phase interferometric system  
A differential-phase interferometric system includes a polarized heterodyne interferometer for generating reference and signal beam that travel along reference and signal channels, respectively....
US20130304407 CHANNEL INTEGRITY DETECTION  
A computer-implemented method can include determining an amplitude for each of a plurality of input channels, corresponding to respective nodes. A measure of similarity can be computed between the...
US20140180617 INVERTER-DRIVEN ROTARY ELECTRIC MACHINE, PHASE-TO-PHASE INSULATION PARTIAL DISCHARGE INSPECTION METHOD AND PHASE-TO-PHASE INSULATION PARTIAL DISCHARGE INSPECTION APPARATUS  
A phase-to-phase insulation partial discharge inspection apparatus includes: an impulse power supply (1) configured to apply an impulse voltage having a voltage rise time period tr which satisfies...
US20120232820 GRID OSCILLATION ANALYSIS METHOD AND APPARATUS THEREFOR  
A method for determining the contribution of a grid subsystem (12) to oscillations in grid frequency experienced by an external electrical grid (14) in an electrical power network (10). A...
US20120239329 SAGNAC PHASE SHIFT TRACKING METHOD FOR FIBER-OPTIC GYROSCOPES  
A Sagnac phase shift tracking method of fiber-optic gyroscopes comprises determining, for both a current time and a previous time, a value of a primary harmonic demodulated signal and a value of a...
US20110022340 Measuring Quantum States of Superconducting Resonators  
A method for measuring the quantum state of a resonator includes, exciting an input port of a circuit with signal, measuring a phase shift of the signal at an output port of the circuit, wherein...
US20100067622 Circuit, Controller and Methods for Dynamic Estimation and Cancellation of Phase and Gain Imbalances in Quadrature Signal Paths of a Receiver  
A controller and a circuit work together to enable a selective and dynamic adjustment to correct phase and gain imbalances in quadrature signal paths of a receiver. Under select conditions, it has...
US20120109559 DISCRETE FOURIER TRANSFORM IN A COMPLEX VECTOR SPACE  
An image-based phase retrieval technique has been developed that can be used on board a space based iterative transformation system. Image-based wavefront sensing is computationally demanding due...
US20110288801 METHOD AND SYSTEM FOR DETERMINING THE TIME-OF-FLIGHT OF A SIGNAL  
A method of estimating the time of flight of a burst signal includes: receiving the burst signal; determining the slope of the phase characteristic of the Fourier transform of the received burst...
US20130030726 CIRCUITRY FOR MEASURING AND COMPENSATING PHASE AND AMPLITUDE DIFFERENCES IN NDT/NDI OPERATION  
Disclosed are a method and an NDT/NDI inspection device deploying digital circuitry to conduct detection and compensation of phase and amplitude shift in responding signals. A digital waveform...
US20090105979 Fixed reference frame phase-locked loop (FRF-PLL) for unbalanced line voltage conditions  
The present invention is an algorithm to implement a phase-locked loop (PLL) which is able to provide an estimation of the angular frequency, and both the positive and negative sequences of the...
US20090112500 Memory-Based High-Speed Interferometer  
An interferometer produces a first optical signal and a second optical signal interfering with each other. The optical signals are converted digital signals form addresses. A memory stores data...
US20130035887 METHOD AND SYSTEM OF PHASE IDENTIFICATION  
Described herein are embodiments of methods and systems of phase identification. One embodiment of the method comprises adjusting one or more operational characteristics of an electrical device;...
US20120150468 Method and System for Estimating and Tracking Frequency and Phase Angle of 3-Phase Power Grid Voltage Signals  
A method estimates parameters of 3-phase voltage signals to synchronize a power grid in a presence of a voltage unbalance by transforming the 3-phase voltage signals to αβ-reference signals using...
US20110301895 PHASE MEASURING DEVICE AND FREQUENCY MEASURING DEVICE  
This disclosure provides a phase measuring device that can measure phase differences with high precision using the digital circuits. A phase measuring device includes a buffer delay measuring...
US20110130992 PHASE IDENTIFICATION SYSTEM AND METHOD  
A phase identification system is proposed. The system includes a sensor coupled to a terminal of a distribution transformer. A processor is coupled to the sensor for processing phase information...
US20130090875 PROTECTIVE RELAYING DEVICE  
According to one embodiment, a protective relaying device includes a phase difference calculating unit configured to calculate a phase difference between a phase obtained by shifting a phase of...
US20100161263 INDEPENDENT FREQUENCY MEASUREMENT AND TRACKING  
Independent frequency measurement and tracking of a signal using a measurement interval where the frequency of the signal is measured and a sampling rate is calculated, and a settling interval...
US20100241379 METHOD OF ANALYZING AN INTEGRATED CIRCUIT, METHOD OF OBSERVATION AND THEIR ASSOCIATED INSTALLATIONS  
A method for analyzing an integrated circuit includes: a step (102) for applying laser radiation at a point on the surface of the circuit; a step (106) for exciting the circuit thus subjected to...
US20110080197 APPARATUS AND METHODS FOR POWER QUALITY MEASUREMENT  
A method for measuring characteristics of a power line signal having a fundamental frequency is provided. The method includes estimating the fundamental frequency of the power line signal, and...
US20100134092 PHASE-DIFFERENCE-CORRESPONDING-VALUE MEASUREMENT DEVICE, GAIN IMBALANCE MEASUREMENT DEVICE, METHOD, PROGRAM, AND RECORDING MEDIUM  
A modulation error measurement device according to the present invention receives a demodulated signal containing a demodulated I signal and a demodulated Q signal from a quadrature demodulator...
US20070225927 Method and an apparatus for measuring noise  
A method for measuring noise of signals under test by frequency converting the signals under test to generate a first intermediate signals, frequency converting the signals under test to generate...
US20170023627 Method and Apparatus for Precision Phasor Measurements Through a Medium-voltage Distribution Transformer  
A means and method for measuring precise voltage phasors on medium-voltage alternating current (AC) distribution grids, using existing distribution transformers as voltage sensors. The errors...
US20170003332 CHANNEL INTEGRITY DETECTION  
A computer-implemented method can include determining an amplitude for each of a plurality of input channels, corresponding to respective nodes. A measure of similarity can be computed between the...
US20160003879 OSCILLATION ANALYSIS METHOD AND APPARATUS THEREFOR  
The present invention relates to apparatus (10) for determining a contribution of at least one grid subsystem of plural grid subsystems to oscillation in angle or grid oscillation in an electrical...
US20140088902 METHOD AND APPARATUS FOR DIGITAL DEMODULATION AND FURTHER PROCESSING OF SIGNALS OBTAINED IN THE MEASUREMENT OF ELECTRICAL BIOIMPEDANCE OR BIOADMITTANCE IN AN OBJECT  
Methods and apparatus for digital demodulation of signals obtained in the measurement of electrical bioimpedance or bioadmittance of an object. One example comprises: generating an excitation...
US20120236428 Systems and Methods for Sync Mark Detection  
Various embodiments of the present invention provide systems and methods for data processing. As an example, a data processing circuit is disclosed that includes an equalizer circuit and a data...
US20110251810 METHOD AND SYSTEM FOR POWERLINE LENGTH MEASUREMENT  
A method and system are provided for determining a length quantity of a power transmission line, which connects a first location with a second location. A first signal having a first carrier...

Matches 1 - 35 out of 35