5SHY6545L0001 ABB Silicon controlled module IGCT high voltage control spare parts

Description

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If no harmonics are present, from Table 8, for a multi-core copper cable with
PVC insulation, method of installation E, with three loaded conductors, a cross
section with current carrying capacity of I0 ≥ I’b = 115 A, is obtained. A 35 mm2
cross section cable can carry, under Standard reference conditions, 126 A.
The current carrying capacity, according to the actual conditions of installation,
is still 126 A, since the value of factors k1 and k2 is 1.
The third harmonic content is assumed to be 28%.
Table 16 shows that for a third harmonic content of 28% the cable must be
dimensioned for the current that flows through the phase conductors, but a
reduction factor of 0.86 must be applied. The current I’b becomes:
From Table 8, a 50 mm2 cable with carrying capacity of 153 A shall be selected.
If the third harmonic content is 40 %, Table 16 shows that the cable shall be
dimensioned according to the current of the neutral conductor and a reduction
factor of 0.86 must be applied.
The current in the neutral conductor is:
and the value of current I’b is:
From Table 8, a 70 mm2 cable with 196 A current carrying capacity shall be
selected.
If the third harmonic content is 60 %, Table 16 shows that the cable shall be
dimensioned according to the current of the neutral conductor, but a reduction
factor of 1 must be applied