ABB UniGear ZS1 User Manual

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4. Panel design and equipment
4.4 Interlock/protection
against incorrect operation
Important note:
All manipulations must be performed in
accordance with description in manual. Every
operation must be finished to its end position.
Intermediate positions are not allowed.
Panel internal interlocking
To prevent hazardous situations and incorrect
operation, there is a series of interlocks to
protect both personnel and equipment:
• The withdrawable part can only be moved
from the test / disconnected position (and
back) when the circuit-breaker and earthing
switch are off (i.e. the switch must be off
before hand.) In the intermediate position,
the switch is mechanically interlocked. When
the circuit-breakers have an electrical
release, the interlock is also electrical.
• The circuit-breaker can only be switched on
when the withdrawable part is in the test or
service position. In the intermediate position
the switch is mechanically interlocked. When
the circuit-breakers have an electrical
release, the interlock is also electrical.
• If required, prevention of malfunction of the
switch can also be achieved by means of the
control terminal (i.e. Relion®).
• In the service or test positions, the circuit-
breaker can only be switched off manually
when no control voltage is applied and it
cannot be closed (electromechanical
interlock).
• Connecting and disconnecting the control
wiring plug is only possible in the test /
disconnected position of the withdrawable
part.
• The earthing switch can only be switched on
if the withdrawable part is in the test /
disconnected position or outside of the
panel (mechanical interlock).
• If the earthing switch is on, the withdrawable
part cannot be moved from the test /
disconnected position to the service position
(mechanical interlock).
• Optionally there can be interlocking on
shutters to prevent manual opening. If it is
applied then a shutter device must be
specified.
• Details of other possible interlocks, e.g. in
connection with a locking magnet on the
withdrawable part and / or earthing switch
drive, can be obtained from the relevant
order documents.

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