ABB UniGear ZS1 User Manual

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2. Summary
Special operating conditions
The switchgear is suitable for operation in the
WDa 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 (Figure 1).
• Increased ambient temperatures must be
compensated in the design of the busbars
and branch conductors, otherwise the
current carrying capacity will be limited.
Note on special climatic operating conditions:
When 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
conditions for indoor 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 resulting
corrosion or other adverse effects.
Figure 1: Curve for determining the altitude factor k in
relation to the altitude H

ABB UniGear ZS1 Specifications

General

Rated Voltage	up to 24 kV
Rated Current	up to 4000 A
Frequency	50/60 Hz
Rated Short-Circuit Breaking Current	up to 50 kA
Rated Peak Withstand Current	up to 125 kA
Insulation	Air-insulated
Type of Switchgear	Metal-clad
Rated Short-time Withstand Current	up to 50 kA for 3s
Internal Arc Classification	IAC AFLR
Protection Degree	IP4X
Busbar System	Single and double busbar
Type Tested Assembly	IEC 62271-200
Dimensions	Varies depending on configuration
Weight	Varies depending on configuration