Abstract: A method for detecting a time synchronization ability of the real-time measuring device based on a time variable is provided. On a premise that the real-time measuring device correctly receives time service signals, the method aims at detecting time synchronization signal application ability of the real-time measuring device, and involves a purely resistive loop comprising a value transferring device and a time controllable switch. The method, via a time synchronization performance thereof, relatively completely reflects the time synchronization signal application ability of the device within a value transfer requirement. The method is a development upon power station time synchronization time service signals and transmission accuracy detection and an improvement of power station time synchronization detection procedures. The method facilitates improving real-time analysis and monitoring abilities of a power station and a power grid to a primary device and a primary system.
November 23, 2012
August 28, 2014
STATE GRID HUBEI ELECTRIC POWER RESEARCH INSTITUTE, STATE GRID CORPORATION OF CHINA
Hong Chen, Yongjun Xia, Yuehai Yu, Gang Hu, Yong Cai, Jin Wang, Qian Tao
Abstract: Provided are a connection error detecting apparatus and method. The connection error detecting apparatus, which detects connection errors for each rating of a smart meter, comprises: a parameter calculating unit for calculating connection error detecting parameters including an actual three-phase voltage value, an actual three-phase current value, an effective amount of three-phase power, and an ineffective amount of three-phase power; and a connection error determining unit for setting connection error criteria for detecting connection errors for each rating of the smart meter, and detecting the connection errors for each rating by determining whether or not any one of the connection error detecting parameters satisfies the connection error criteria.
August 17, 2011
July 17, 2014
KOREA ELECTRIC POWER CORPORATION
Sang-Jun Kim, Tae-Hyo Kim, Woo-Yong Kim, Sang-Suh Park, Sung-Min Kim
Abstract: A system is disclosed for monitoring electrical power distribution lines comprising a plurality of mesh networks. Each mesh network monitors electrical power distribution lines at a select location of the power grid. Each mesh network comprises a plurality of wireless sensors adapted for wireless communications therebetween. Each wireless sensor measures attributes of line voltage for an associated electrical power distribution line at the select location. A master sensor collects data from the other sensors in the mesh network and determining voltage in phase attribute data of the electrical power distribution lines at the select location. The master sensor comprises a gateway device for communication outside of the mesh network. A monitor device for communication with master sensors receives voltage and phase attribute data from the master sensors for monitoring operation of the electrical power distribution line power grid.
Abstract: An apparatus and a method for reducing phase noise in measurement signals from a sensor are provided. The apparatus and method, in one aspect, may use a multiphase counter to obtain a count for each sensor signals time cycle and a filter to reduce noise from the obtained counts. A suitable reference frequency, including the reference frequency of the sensor, may be utilized by the multiphase counter.
Abstract: A processing method for an operation system which performs operation processing in accordance with a detection amount detected by detection means and pulse output processing in which an operation result from the operation processing is transmitted as a pulse output, including: controlling transmission of the pulse output performed in the pulse output processing to make the transmission of the pulse output asynchronous with a timing of an end of the operation processing; and transmitting, by repeating the controlling, a pulse train having time-series continuity.
Abstract: The specific phase position detection circuit detects first and second temporal positions which have respective desired phase offsets from an upper peak position and an lower peak position of an analog signal having periodicity. The specific phase position detection circuit then outputs phase signals indicating the detected first and second temporal positions.
Abstract: A designated function or “golden” slot for implementing and managing re-configurable SDR modules is provided. In an embodiment, the slot includes at least one radio frequency (RF) front end for providing an interface with at least one antenna. In addition, the slot may include at least one slot modem coupled to the RF front end for implementing at least one designated function and at least one input/output (I/O) module coupled to the slot modem. The designated function or “golden” slot is capable of implementing and managing the at least one designated function in a re-configurable module during standard and emergency operations.
April 5, 2006
Date of Patent:
June 23, 2009
Rockwell Collins, Inc.
Joel M. Wichgers, Demetri Tsamis, Terrence L. Leier, Gregory A. Arundale
Abstract: The present invention provides an acoustic transmitter for sequentially transmitting a plurality of pulse signals by sound. Each of the plurality of pulse signals is a signal of at least one modulated carrier wave, which has a predetermined frequency. The carrier wave of each of the pulse signals has a mutually different frequency. The transmitter performs amplitude modulation and/or phase modulation based on transmission information, and modulation by a signal indicating a window function, for the carrier wave of each of pulse signals. Then the transmitter sequentially transmits the plurality of pulse signals by sound.
Abstract: A parametric loudspeaker which uses multiple piezoelectric bimorph transducers. These multiple piezoelectric bimorphs have a resonant frequency which varies from unit to unit. The phase response at and near the resonant frequency changes at a very high rate with slight changes in frequency. The associated modulator electronics have a primary carrier frequency that is optimized for maximum parametric output. This is achieved by aligning the carrier frequency with the flattest portions of the phase curve for maximum phase coordination among the multiple devices.
October 29, 1999
Date of Patent:
February 1, 2005
American Technology Corporation
Elwood G. Norris, Joseph O. Norris, James J. Croft, III
Abstract: A fiberoptic transceiver system for use in an industrial paint spraying apparatus where analog information from flow sensors in the flow meter on the spray head is converted to a single channel digital signal for transmission on a fiberoptic cable to a receiver for decoding into an analog signal representing flow rate and a signal indicating flow direction. The encoding of two signals onto one channel is accomplished by encoding the flow rate as the frequency of the digital signal and the direction as the pulse width. The direction of the flow is determined by comparing the two analog signals from the flow meter and determining which signal is lagging the other.
Abstract: A method for remotely monitoring the magnitude and direction of net electrical power and current flow to or from a facility over a prolonged period of time. The method includes detecting and measuring the magnetic field emanating from the monitored line(s), and detecting a signal synchronized to the power system frequency, typically the electric field, emanating from the power lines. The method further includes evaluating, storing, and transmitting the data on the electromagnetic (EM) fields that are recorded.
Abstract: A galvanometer is described which has increased capacitance and which is hardly affected by humidity while maintaining the advantages of low machining precision and being unaffected by temperature variations.
A front bearing and a rear bearing are fixed to a front shaft and a rear shaft, respectively, of a rotor held in a coil of a stator. Only an outer race of the front bearing is slidably inserted without being fixed to a case and has a force applied in a rear shaft direction by springs. A butterfly-shaped common electrode, which is patterned with a conductive thin film, is mounted on the rear shaft through a hub, and a four-division electrode is opposed thereto with an extremely small air gap to the butterfly-shaped common electrode. The four-division electrode is mounted on a spacer, and the spacer is mounted on the case so as to provide the air gap of a desired dimension. The rear shaft, the hub, and the spacer are made of an identical material.
Abstract: There is provided a telemetry system with a receiver which enables detection of pulsed high frequency data (hf) signals in a manner which suppresses noise which may be present within the high frequency bandwidth. The transmitter carrier, which may be subject to some instability, is encoded at a symbol rate which is generated at a lower frequency than the hf, but which is reliably stable. The receiver detects the phase of each received hf pulse, and generates a phase-locked signal which is synchronized to the transmitter symbol signal. The phase-locked signal in turn is used to demodulate the received pulsed signals. In a specific DSP embodiment, the phase-lock loop has a numerically controlled oscillator which has a center frequency which corresponds to the aliased phase difference between the hf carrier phase and the phase of each pulse, thereby obtaining a signal which carries information as to the exact symbol rate.
Abstract: A system for displaying dynamic on-line operating conditions of an interconnected power transmission network including components to monitor the interconnected power transmission network by measuring and correlating voltage magnitude and phase existing at selected station busses of the interconnected power transmission network and to display isovoltage and isophase contour lines on a map representative of the interconnected power transmission network geographic area thereby showing existing operating conditions of the interconnected power transmission network wherein the location and nature of any disturbances occurring on the interconnected power transmission network is indicated on the map by a change in the positions of the isovoltage and isophase contour lines relative to the normal network operating isovoltage and isophase contour lines such that upon detection of an abnormal operating condition a system operator may initiate action within the interconnected power transmission network to correct for the