Effect of Fe3O4 and Al2O3 Nanoparticles on Creeping Discharges Propagating Over Solid-Natural Ester FR3 Interface Under Lightning Impulse Voltage

This paper aims to study the impact of conducting
$(Fe3O_{4},2\theta nm)$
and insulating
$(Al_{2}O_{3},20-30 nm)$
nanoparticles
$(NPs)$
on the creeping discharges propagating over solid-liquid interfaces under positive lightning impulse voltage. Five nanoparticles' concentrations ranging from
$0.1 g/L$
to
$0.5 g/L$
are considered. First, the nanofluids preparation procedure is presented; it combines high-speed agitation and ultra-sonication. Then, radial creeping discharges were characterized by the Measurement of their stopping length
$(L {f);}$
the stopping length characteristic versus the applied voltage is plotted. It is shown that the addition of
$Fe3O_{4}$
and
$Al_{2}O_{3}$
nanoparticles improves the resistivity against the propagation of creeping discharges at specific concentrations
$(\theta.3g/L$
and 0.4
$g/L)$
in the case of
$Fe3O_{4}$
nanoparticles and all concentrations in the case of
$Al_{2}O_{3}$
nanoparticles. Compared to base liquid, the best performances are observed at
$56 kV$
with
$Fe3O_{4}$
nanoparticles
$(L_{f}$
is reduced by 18.61%) at
$0.3 g/L$
and
$Al_{2}O_{3}$
nanoparticles
$(L_{f}$
is reduced by 23.00%) at
$0.4 g/L$
.