Abstract
In this paper an algorithm for directional earth-fault relay without voltage inputs is presented. This relay is intended for use in isolated neutral networks. For a reference quantity the algorithm does not use the zero sequence voltage, but phase currents since in isolated neutral system they vary only slightly when a phase-to-earth fault occurs. Instead of the phase angle between the zero-sequence voltage and current phasors, the integral of the product of the phase and zero-sequence current over one-half period of the signals is calculated. For this reason the algorithm has high speed of response. The algorithm detects not only the line containing a phase-to-earth fault but also the faulted phase.
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.
