The mechanical effects of short-circuit currents in - Montefiore

d) Determination of the forces at the supports
using Table 2 of the standard:
*
*
'
N
F d (15)
Y
'
Y
'
N
reclosing N
Y
End 1
In case of a single conductor, σtot is to be replaced
by σ m.
* for short-circuit in single-phase systems, 2,7 is
to be replaced by 2,0
138
e) Calculation of the stress due to the forces
between the main conductors and between the
sub-conductors during second short-circuit current
flow; check of the short-circuit withstand of main
and sub-conductors:
Stop 4
Y
N σm ≤ qRp0,2
(11)
= 1,8 T2
σ m (9)
n = 1
N
Y Y
V σs V rs = 1,8 T2
σ s (10)
σ s
σ tot (12)
σ tot
≤ Rp0,2 (14)
Y
N
≤ qR
N
p0,2
(13)
Stop 3
Stop 4