The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 14, 2022
Filed:
Oct. 31, 2018
Hitachi Energy Switzerland Ag, Baden, CH;
Swaroop Gajare, Bangalore, IN;
Obbalareddi Demudu Naidu, Bangalore, IN;
Neethu George, Bangalore, IN;
Sachin Srivastava, Bangalore, IN;
A. V. Sai, Ongole, IN;
HITACHI ENERGY SWITZERLAND AG, Baden, CH;
Abstract
A method and device can be used with a power transmission line. Pre-fault voltage and current phasors and during-fault voltage and current phasors for each of first, second, and third terminals are determined based on disturbance records. Using an assumed faulted section, values for a propagation constant of each section, a surge impedance of each section, and a fault location parameter are computed. The computing is based on simultaneously solving pre-fault and during-fault objective functions for the assumed faulted section with the computed pre-fault and during-fault voltage and current phasors. The pre-fault and during-fault objective functions are formulated based on equating junction voltages determined from two of the terminals, conservation of charge at the junction, and equating fault location voltages determined from one terminal and the junction. The values determined for the propagation constant, the surge impedance, and the fault location parameter can be compared with predefined criteria.