Abstract
Modern power grids that have complicated network structures and changeful operating conditions bring challenges to conventional backup protection. A novel fault detection algorithm based on pilot impedances using the synchronized data for transmission line is proposed to improve the sensitivity and reliability of the protection. The novel pilot impedances at both sides of the line are respectively defined by the fault components of positive-, negative-, zero-sequence currents and voltages. The fault judging quantities that fuse pilot impedances are given to establish the protection criterion. The blocking measures are taken to overcome the maloperation problem during power swing and open-phase operation. The proposed algorithm is extensively validated on IEEE 39 bus system and 500kV two-machine system under various conditions, including internal and external faults, the load encroachment, open-phase operation, power swing and unsynchronized data. The simulation results on PSCAD/EMTDC illustrate that the proposed algorithm can reliably detect the faulted line under various conditions, and have good abilities to resist the fault types, transition resistance, and unsynchronized data.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
