| Patents for G01R 25 - Arrangements for measuring phase angle between a voltage and a current or between voltages or currents (2,594) |
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| 05/25/2011 | CN101294996B Measuring circuit |
| 05/19/2011 | US20110115468 Receiving apparatus, test apparatus, receiving method, and test method |
| 05/18/2011 | CN201837729U High-density induced polarization phase electrical measuring instrument |
| 05/18/2011 | CN201837682U Nuclear phase detection device provided with insulation sleeve |
| 05/17/2011 | US7945408 Time delay estimation |
| 05/17/2011 | US7945406 Measuring device and method for measuring relative phase shifts of digital signals |
| 05/11/2011 | CN101583047B System and method for generating reset signal |
| 05/10/2011 | US7940088 High speed phase frequency detector |
| 05/05/2011 | US20110102020 Balanced phase detector |
| 05/05/2011 | US20110101955 System and method for implementing low-cost electronic gyroscopes and accelerometer |
| 05/05/2011 | US20110101786 Method and apparatus for anti-islanding of distributed power generation systems |
| 05/05/2011 | DE112009000873T5 Partielle Abtastungen zur Verbesserung der Messung und Messausrüstung Partial scans to improve the measurement and measurement equipment |
| 05/04/2011 | CN102043091A Digitized high-precision phase detector |
| 05/04/2011 | CN102043085A Ultrahigh voltage power grid and current on-load detector |
| 05/03/2011 | US7936348 Methods and apparatuses using control indicators for data processing systems |
| 04/28/2011 | CA2777548A1 Fault detection using phase comparison |
| 04/27/2011 | CN102033177A Method and system for measuring power angle of electric power circuit of distribution network |
| 04/21/2011 | US20110089930 Method for determining at least one first internal parameter of a sensor |
| 04/20/2011 | CN102024624A Device and method to monitor electrical contact status |
| 04/20/2011 | CN101266265B Method for detecting high voltage frequency converter electric network voltage phase |
| 04/14/2011 | DE102009048509A1 Verfahren und Vorrichtung zur Ermittlung einer Eingangsspannung an einer Ortsnetzstation eines Stromnetzes Method and apparatus for determining an input voltage at a local substation of a power network |
| 04/13/2011 | CN102012475A Leakage current detection circuit of circuit |
| 04/13/2011 | CN102012459A Phase detection circuit |
| 04/13/2011 | CN101551418B Method for detecting phase difference between two channels of square wave input signals by using D trigger |
| 04/07/2011 | US20110082654 Power grid with comparison of differences in remote phasor changes |
| 04/07/2011 | US20110080160 Rotational angle detection device and electric power steering system |
| 04/07/2011 | US20110080159 Method for Testing the Operation of a Heating Element Used for an Activated Carbon Filter |
| 04/06/2011 | CN201788226U Radio frequency power phase detection device |
| 04/06/2011 | CN102004241A Autotracking phase zero value calibration device of system for measuring wave beam waveguide receiving on ground |
| 04/06/2011 | CN102004186A High-accuracy sinusoidal signal measuring method and device for removing frequency spectrum leakage |
| 04/06/2011 | CN101614771B Detection method of digital substation PT secondary phase sequence verification |
| 03/31/2011 | WO2011038166A2 Measuring phase noise in radio frequency, microwave or millimeter signals based on photonic delay |
| 03/31/2011 | CA2772941A1 Measuring phase noise in radio frequency, microwave or millimeter signals based on photonic delay |
| 03/30/2011 | CN201780346U Special intelligent wiring detector for watt-hour meter wiring and electricity inspection |
| 03/30/2011 | CN201780333U Single-phase power load angle detection circuit |
| 03/30/2011 | CN101995542A Semiconductor integrated circuit test device |
| 03/30/2011 | CN101995515A Ac voltage phase discriminator for circuit breaker locators |
| 03/24/2011 | US20110068770 Method for Determining the Offset of a Periodic Signal |
| 03/23/2011 | CN101008660B Glue-injection techniques method of phase sensor |
| 03/22/2011 | US7910374 Volumetric induction phase shift detection system for determining tissue water content properties |
| 03/16/2011 | CN101661057B Device for implementing power measurement based on resistance sampling by linear optocoupler |
| 03/10/2011 | WO2011029018A2 Voltage conversion and/or electrical measurements from 400 volts upwards |
| 03/09/2011 | EP2293411A2 Wireless power feeder and wireless power transmission system |
| 03/09/2011 | CN201757772U Power quality recording analyzing system |
| 03/08/2011 | US7902918 Demodulation apparatus, test apparatus and electronic device |
| 03/03/2011 | US20110050283 Synchronous phase detection circuit |
| 03/02/2011 | CN201754167U Handheld nuclear phase instrument for digital transformer substation |
| 03/01/2011 | US7900098 Receiver for recovering and retiming electromagnetically coupled data |
| 02/23/2011 | CN101980030A 串接式零负荷电流相位测量仪 Tandem type zero load current phase meter |
| 02/22/2011 | US7893725 Delay locked loop circuit |
| 02/22/2011 | US7893724 Method and circuit for rapid alignment of signals |
| 02/17/2011 | DE112009000703T5 Messvorrichtung, Parallelmessvorrichtung, Testvorrichtung, elektronische Anordnung Measuring device, parallel measuring device, test device, electronic device |
| 02/16/2011 | CN201749171U Power angle measurement device of experimental synchronous generator |
| 02/09/2011 | EP2281333A2 Transmission line directional awareness |
| 02/09/2011 | CN201740840U Earth fault phase identification device in three-phase unearthed system |
| 02/09/2011 | CN201740815U Synchronous phasor measurement device |
| 02/09/2011 | CN101515003B Method for measuring surface charge density of materials |
| 02/03/2011 | DE102009031017A1 Verfahren und Vorrichtung zur Netzzustandsbeobachtung Method and apparatus for network status monitoring |
| 02/02/2011 | CN101963644A Oscillation center capturing method for out-of-step oscillation of power system |
| 02/02/2011 | CN101963643A Method for judging out-of-step oscillation of power system |
| 01/26/2011 | EP2039008B1 Device and method for high resolution time measurements |
| 01/26/2011 | CN101957401A Power-distribution electric energy comprehensive measuring apparatus and measuring method thereof |
| 01/26/2011 | CN101957400A Distribution electric energy quality analysis meter and analyzing method |
| 01/26/2011 | CN101587159B Power distribution network outgoing feeder fault route selecting method by S transform amplitude detection |
| 01/26/2011 | CN101206236B Device and method for detecting phase difference |
| 01/20/2011 | US20110012586 Method for detecting, identifying and locating partial discharges occurring in a discharge site along an electric apparatus |
| 01/19/2011 | CN201716368U Device for analyzing and identifying phase of cable |
| 01/12/2011 | CN101943719A Shared-frequency asynchronous phase-checking method |
| 01/12/2011 | CN101470143B Apparatus and method for on-line resistance measurement |
| 01/11/2011 | US7870086 Method and apparatus for phase-independent predictable resetting |
| 01/04/2011 | US7865660 Calibration of read/write memory access via advanced memory buffer |
| 12/29/2010 | CN101931219A Phase deviation based auto-disturbance rejection isolated island detecting method |
| 12/29/2010 | CN101930227A State detection and energy-saving control system for electric equipment and control method thereof |
| 12/29/2010 | CN101930028A Power phase detection device, method and computer program product |
| 12/29/2010 | CN101576583B Method for testing voltage ratio of transformer with phase-shifting winding |
| 12/23/2010 | US20100321001 Phase detecting apparatus, test apparatus and adjusting method |
| 12/22/2010 | CN101923126A Digital protecting tester, automatic closed loop test system and method |
| 12/22/2010 | CN101923114A Resistance phasing method for medium-voltage distribution line looped network |
| 12/22/2010 | CN101576586B Phase detection method based on adaptive filtering |
| 12/21/2010 | US7855580 Phase comparator, phase synchronizing circuit, and phase-comparison control method |
| 12/16/2010 | US20100315063 Meter device and method of testing a cut neutral conductor |
| 12/15/2010 | CN201673213U Secondary automatic phase checking device |
| 12/15/2010 | CN101915884A Identification method of ground fault phases in three-phase ungrounded system and identification device thereof |
| 12/15/2010 | CN101915875A Method for measuring phase difference of common-period signals based on delay unit dedicated for FPGA |
| 12/09/2010 | US20100308792 Branch current monitor with configuration |
| 12/08/2010 | CN201666922U High-voltage nuclear phase pen |
| 12/08/2010 | CN101907686A Generator power-angle measuring method based on GPS (Global Positioning System) and Big Dipper binary star system |
| 12/08/2010 | CN101907656A Method for measuring phase difference of common-frequency signal with fixed phase drift |
| 12/08/2010 | CN101907647A Distribution transformer monitoring and metering terminal |
| 12/02/2010 | WO2010136390A1 Transmitter phase shift determination and compensation |
| 12/01/2010 | CN101408568B Method and device for measuring electrical signal phase of alternating current |
| 12/01/2010 | CN101051456B Audio frequency phase detecting and automatic correcting device |
| 11/30/2010 | US7844386 Reference signal generator and method |
| 11/24/2010 | CN101893662A Nuclear phase method for digital transformer substation |
| 11/23/2010 | US7839179 Balanced phase detector |
| 11/23/2010 | US7839177 Techniques for phase detection with fast reset |
| 11/18/2010 | US20100289480 Physical quantity detection circuit |
| 11/17/2010 | CN201637791U Online monitoring system for high-voltage shunt capacitor |
| 11/17/2010 | CN201637784U Phasing contact of switch cabinet of wireless phasing tester |
| 11/17/2010 | CN201637778U Power factor sampling and compensating device |