Page 49 - IJEEE-2022-Vol18-ISSUE-1

Saeed, Abdulhassan & Khudair | 45

Fault location B. Simulation result with FFT Analysis
From the proposed simulation model of series and
Fig .13: Simulation result of parallel arc fault using DWT
and db2. parallel arc fault with FFT analysis implementation in
MATLAB/Simulink. The FFT results clearly show that the
harmonic amplitude of arc current is low when the circuit is
operating normally and when an arc fault happens, the
current spectrum's amplitude increases also the numbers of
harmonics are increase. This method determines whether or
not a certain frequency variable occurs and this knowledge
is regardless of where this item occurs in time. This is why
Fourier Transformation is ineffective when the signal's
frequency varies over time, i.e., when the signal is non-
stationary. But to distinguish the arc faults from the healthy
signals, we analyzed these signals using FFT and found that
these results differ in the amplitude of harmonics of the
healthy and arc fault signals. To overcome this drawback of
FFT, we preferred DWT, the results of FFT technique of
series and parallel arc fault are shown in Figures from Fig.14
to Fig.17.

Fig. 14. Series healthy current waveform analyzed online with FFT Simulink
Fig. 15: Parallel healthy current waveform analyzed online with FFT Simulink.