| Popis: |
High Impedance Faults (HIFs) are commonly known for their unpredictable, nonlinear, and unstable nature, due to the presence of electric arcs. Considering the low current amplitude of these faults, reliable detection and discrimination from typical power system events have proven to be troublesome. Conventional over-current relaying techniques are insensitive to the similar behavior of these faults and single phase loads. Extraction of harmonic patterns from FFT spectrum as HIF signature, along with joint execution of abnormal condition detection, has led to the design of a new FFT based scheme. In this paper, an in-depth performance evaluation has been executed to verify its functionality. Simplicity, low computational burden and high accuracy in successful fault and switching event detection are some of its virtues. Simulation of an IEEE standard distribution system and performance evaluations in regard to conventional methods have provided proof to this claim. |
