ABB UniSec, Руководство по эксплуатации и обслуживанию

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4
U N I S EC DI G ITA L
O P ER AT I O N A N D M A I N T EN A N C E M A N UA L
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Introduction
Operating conditions
Normal operating conditions
The switchgear is designed for indoor use in normal
operating conditions, as indicated in the respective
IEC regulations (see table 1). Differences with
respect to the normal operating conditions
specified in the IEC standards (IEC 62271-1) must be
defined separately with the manufacturer.
Ambient temperature ° C
Maximum value + 40
Max. mean value in 24 hours + 35
Min. mean value in 24 hours - 5
(1)
Recommended minimum value + 5
Altitude above sea level m
Maximum value 1000
Humidity conditions %
Relative humidity mean value
(24 hours) ≤ 95
Relative humidity mean value
(1 month) ≤ 90
Pollution
The ambient air must not be excessively polluted by dust,
smoke, corrosive and/or inflammable gases, vapours or
salinity
(1) Consult ABB for –25°C operating temperatures and –40°C
storage temperatures
Table 2. Operating conditions
Special operating conditions
The effects of the reduction in the dielectric
strength of the insulating air must be considered at
altitudes exceeding 1000 m (consult standard IEC
61271-1).IEC 61271-1 standards). Environmental
temperature rises must be compensated when the
busbars, branches and components are designed,
otherwise the current carrying capacity will be
limited.
DANGER
Condensation could form if the switchgear is in
service where the humidity level is high and/or
there are considerable temperature variations.
However, the formation of condensation must be
an exception to the rule in the normal operating
conditions of indoor switchgear. Adequate
preventive measures must be taken along with the
manufacturer (e.g. installation of electric heaters)
to prevent condensation from forming and,
consequently, corrosion or other adverse effects.
The operating system of the heaters depends on
the relative design, while the specifications must
be taken from the order documents