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Voltage sags caused by the shortcircuit faults in
transmission and distribution lines have become one of the
most important power quality problems facing industrial
customers and utilities. Voltage sags are normally described
by characteristics of both magnitude and duration, but phaseangle
jump should be taken into account in identifying sag
phenomena and finding their solutions. In this paper, voltage
sags due to power system faults such as threephasetoground,
single phasetoground, phasetophase, and twophasetoground
faults are characterized by using symmetrical
component analysis and their effect on the magnitude
variation and phaseangle jumps for each phase are examined.
A simple and practical method is proposed for voltage sag
detection, by calculating RMS voltage over a window of one
cycle and onehalf cycle. The industrial distribution system
at Bajaj hospital is taken as a case study. Simulation studies
have been performed by suing MATLAB/SIMULINK and the
results are presented at various magnitudes, duration and
phaseangle jumps.
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