Preliminary Operations; Auxiliary Circuits - ABB eVM1 Installation And Service Instructions Manual

Note
Warning!
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9.3. Preliminary operations

– Clean the insulating parts with clean dry cloths.
– Check that the top and bottom terminals are clean and free of any deformation caused by shocks
received during transport or storage.
9.4. Installation of fixed circuit-breakers
The circuit-breaker can be mounted directly onsupporting frames to be provided by the cus-tomer,
or on a special supporting truck (avail-able on request).The circuit-breaker, with supporting truck,
mustbe suitably fixed to the floor of its own compart-ment by the customer. The floor surface in
corre-spondence with the truck wheels must be care-fully levelled.A minimum degree of protection
(IP2X) must beguaranteed from the front towards live parts.
9.5. Installation of withdrawable circuit-breakers
The withdrawable circuit-breakers are preset for use in UniGear ZS1 type switchgear and PowerCube
modules.
For racking-in/racking-out of the switchgear: connect the auxiliary circuits thereby supplying the
locking electromagnet in the truck, fully insert the crank handle (1) (fig. 13) in the appropriate seat
(2) and work it clockwise for racking-in, and anti-clockwise for racking-out, until the end-of-run
positions are reached.
Circuit-breaker racking-in/-out must be carried out gradually to avoid shocks which may deform
the mechanical interlocks and the end-of-runs.
The torque normally required to carry out racking-in and racking-out is <25 Nm.
This value must not be exceeded. If operations are prevented or difficult, do not force them and
check that the operating sequence is correct.
To complete the racking-in/out operation, about 20 turns of the crank handle are required for circuit-
breakers up to 17.5 kV. When the circuit-breaker has reached the isolated for test/isolated position it
can be considered as racked into the switchgear and, at the same time, earthed by means of the truck
wheels. Withdrawable circuit-breakers of the same version, and therefore with the same dimensions,
are interchangeable.
For the circuit-breaker installation operations, also refer to the technical documentation of the above-
mentioned switchgear.
The racking-in/-out operations must always be carried out with the circuit-breaker open.

9.6. Auxiliary circuits

The auxiliary circuits of withdrawable circuit-breakers are fully cabled in the factory as far as the
multi-pole connector (fig. 14). For the external connections, refer to the electric wiring diagram of the
switchgear.