ABB TAS.580.0560G00 After sales service is provided for the control card of the power supply device

Description

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Equipment likely to cause significant harmonic currents are, for example, fluorescent lighting banks and dc power supplies such as those found in computers
(for further information on harmonic disturbances see the IEC 61000).
The reduction factors given in Table 16 only apply in the balanced three-phase
circuits (the current in the fourth conductor is due to harmonics only) to cables
where the neutral conductor is within a four-core or five-core cable and is of
the same material and cross-sectional area as the phase conductors. These
reduction factors have been calculated based on third harmonic currents. If
significant, i.e. more than 10 %, higher harmonics (e.g. 9th, 12th, etc.) are
expected or there is an unbalance between phases of more than 50 %, then
lower reduction factors may be applicable: these factors can be calculated only
by taking into account the real shape of the current in the loaded phases.
Where the neutral current is expected to be higher than the phase current then
the cable size should be selected on the basis of the neutral current.
Where the cable size selection is based on a neutral current which is not significantly higher than the phase current, it is necessary to reduce the tabulated
current carrying capacity for three loaded conductors.
If the neutral current is more than 135 % of the phase current and the cable size
is selected on the basis of the neutral current, then the three phase conductors
will not be fully loaded. The reduction in heat generated by the phase conductors offsets the heat generated by the neutral conductor to the extent that it is
not necessary to apply any reduction factor to the current carrying capacity for
three loaded conductors.

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 cable to be dimensioned is a multi-core cable and therefore constitutes
a single circuit;
the total number of circuits is 7.
Referring to the row for the arrangement (cables bunched) 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 = 212.85 A, is obtained. A 95 mm2
cross section cable can
carry, under Standard reference conditions, 238 A.
The current carrying capacity, according to the actual conditions of installation,
is Iz
= 238 . 0.87. 0.54 = 111.81 A