ABB UniSec Kullanım ve Bakım Kılavuzu - Sayfa 4

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U N I S E C D I G I TA L M A N U A L E D I F U N Z I O N A M E N TO E M A N U T E N Z I O N E

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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

Maximum value

Max. mean value in 24 hours

Min. mean value in 24 hours

Recommended minimum value

Altitude above sea level

Maximum value

Humidity conditions

Relative humidity mean value

(24 hours)

Relative humidity mean value

(1 month)

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.

° C

+ 40

+ 35

- 5

(1)

Condensation could form if the switchgear is in

+ 5

service where the humidity level is high and/or

there are considerable temperature variations.

1000

However, the formation of condensation must be

an exception to the rule in the normal operating

≤ 95

conditions of indoor switchgear. Adequate

preventive measures must be taken along with the

≤ 90

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

DANGER