Patents Assigned to British Columbia Transmission Corporation
  • Publication number: 20110139503
    Abstract: A cross arm is provided, for use in a support structure for conductors within an electrical grid. The cross arm is made of a cementitious composite and has a rough ā€œCā€ cross sectional shape. Pairs of the cross arms are attached to utility poles in a parallel position on opposite sides of the utility pole. Alternatively, a single cross arm may be attached to a utility pole. Embedded metal or glass fibre reinforced polymer bars extend along the length of the cross arms.
    Type: Application
    Filed: December 11, 2009
    Publication date: June 16, 2011
    Applicants: British Columbia Transmission Corporation, Lafarge Canada Inc.
    Inventors: Juan Ignacio CARIAGA CRESPO, Adelana R. GILPIN-JACKSON, Janos Csaba TOTH
  • Patent number: 7710729
    Abstract: A system and method for estimating parameters of transmission lines employing phasor measurement units is provided, wherein measurements are provided from the phasor measurement units relating to a transmission line. These measurements are filtered to remove invalid measurements. Using the remaining valid measurements, resistance, reactance and grounding admittance are calculated and estimated and checked for errors.
    Type: Grant
    Filed: September 25, 2007
    Date of Patent: May 4, 2010
    Assignee: British Columbia Transmission Corporation
    Inventors: Wenyuan Li, Paul Choudhury, Jun Sun
  • Publication number: 20090027067
    Abstract: A method of identifying voltage instability in a power system via identification of a weakest line and bus that contribute to the collapse of the system is provided. The method includes periodically calculating an extended line stability index for the transmission lines monitored in the power system; and using the extended line stability index to determine the distance of an operation state in the power system from a collapse point of the system caused by voltage instability.
    Type: Application
    Filed: September 25, 2007
    Publication date: January 29, 2009
    Applicant: BRITISH COLUMBIA TRANSMISSION CORPORATION
    Inventors: Wenyuan Li, Juan Yu, Yang Wang, Paul Choudhury, Jun Sun
  • Publication number: 20090027066
    Abstract: A system and method for estimating parameters of transmission lines employing phasor measurement units is provided, wherein measurements are provided from the phasor measurement units relating to a transmission line. These measurements are filtered to remove invalid measurements. Using the remaining valid measurements, resistance, reactance and grounding admittance are calculated and estimated and checked for errors.
    Type: Application
    Filed: September 25, 2007
    Publication date: January 29, 2009
    Applicant: BRITISH COLUMBIA TRANSMISSION CORPORATION
    Inventors: Wenyuan Li, Paul Choudhury, Jun Sun
  • Publication number: 20080059088
    Abstract: A method of state estimation is provided, including: (a) acquiring a plurality of positive sequence voltage and current phasor measurements; (b) designating a reference positive sequence voltage phasor measurement from the acquired phasor measurements; (c) correcting the acquired phasor measurements to account for the reference phasor measurement; (d) calculating complex power having a real component and an imaginary component, using the corrected positive sequence voltage and current phasor measurement; (e) using the real component of said complex power as a calculated mega-watt and the imaginary component of the complex power as a calculated mega-volt-ampere; and (f) using the mega-watt and mega volt-ampere calculations in a state estimation algorithm.
    Type: Application
    Filed: August 24, 2007
    Publication date: March 6, 2008
    Applicant: BRITISH COLUMBIA TRANSMISSION CORPORATION
    Inventors: Djorde Atanackovic, Greg Dwernychuk, Jose Clapauch