5SHY5055L0002 ABB Silicon controlled module IGCT high voltage control spare parts

Description

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Procedure:
Type of installation
In Table 3, it is possible to find the reference number of the installation and the
method of installation to be used for the calculations. In this example, the
reference number is 31, which corresponds to method E (multi-core cable on
tray).
Correction factor of temperature k1
From Table 4, for a temperature of 40 °C and PVC insulation material, k1 =
0.87.
Correction factor for adjacent cables k2
For the multi-core cables grouped on the perforated tray see Table 5.
As a first step, the number of circuits or multi-core cables present shall be
determined; given that:
• each circuit a), b) and d) constitute a separate circuit;
• circuit c) consists of three circuits, since it is composed by three cables in
parallel per phase;
the total number of circuits is 7.
Referring to the row for the arrangement (single layer on the perforated tray)
and to the column for the number of circuits (7)
After k1 and k2 have been determined, I’b is calculated by:
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 = 157.4 A, is obtained. A 70 mm2 cross section cable can
carry, under Standard reference conditions, 196 A.
The current carrying capacity, according to the actual conditions of installation,
is Iz = 196 . 0.87. 0.73 = 124 A