کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
703890 | 1460917 | 2013 | 6 صفحه PDF | دانلود رایگان |

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.
► The method is based on digital phase comparison.
► The procedure is intended for use in isolated neutral networks.
► Instead of voltage as a reference quantity the algorithm uses phase currents.
► The algorithm detects the line that contains an earth-fault and faulted phase.
Journal: Electric Power Systems Research - Volume 96, March 2013, Pages 144–149