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2.4 Operating condition
2.3.1. Normal operating conditions
The
switchgear
is
operating
conditions
accordance
with
IEC
considerations, the following limiting values apply:
Amb i en t temp e ratu re:
Max i mu m
Max i mu m 24 h av era ge
Mi ni mu m (acc ordi ng t o "minus 5 indo or class")
Amb i en t h u mi d i ty:
Max i mu m 24 h av era ge of relat i v e humid it y
Max i mu m 24 h av era ge of wat e r v apour pressure
Max i mu m mont h l y av erage of r elat iv e hu mi dit y
Max i mu m mont h l y av erage of w at er v apour pressur e
The normal operational altitude is up to 1000 m above
sea level. The indoor ambient conditions are free of
significant pollution, such as dust, smoke, corrosive
and/or flammable gases, vapors or salt, etc.
2.3.2. Special operating conditions
The switchgear is suitable for operation in the W Da
type of climate according to IEC 60721 -2-1.
Special
operating conditions must be discussed with
ABB in advance. For example:
At site altitudes above 1000 m, the effects of the
reduction in dielectric strength of the air on the
insulation level must be taken into account
1).
Increased
ambient
compensated in the design of the busbars and
branch conductors, otherwise the current carrying
capacity will be limited.
Note on special climatic operating conditions:
W hen switchgear is operated in areas with high
humidity and/ or major rapid temperature fluctuations,
there is a risk of dew deposits which must be excluded
under
normal
operating
switchgear. Preventive action (e.g. suitable ventilation
and proper air conditioning of the building or housing,
use of dehumidifying equipment, etc.) must be taken
into consideration with ABB to avoid this condensation
phenomenon and any resu lting corrosion or other
adverse effects.
basically
suitable
for
for
indoor
switchgear
62271-200.
Among
temperatures
must
condition s
for
normal
in
other
+ 40 °C
+ 35 °C
- 5 °C
95% RH
F i g u re 1: Cu rve fo r d etermi n in g th e al ti tu d e facto r k in
2. 2 k Pa
rel ati o n to th e al ti tud e H.
90% RH
1. 8 k Pa
(Figure
be
indoor
3
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