Commissioning/Operation; Note On Safety At Work; Preparatory Activities - ABB VM1 Manual

VM1 - INSTRUCTION MANUAL BA 504/05 E
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6. Commissioning / Operation
6.1 Notes on safety at work
(Figure 9/17)
• Operation is only permissible by
specially trained personnel who are
familiar with the characteristics of the
particular switching device.
• Observe the relevant specifications as
set out in section 1.2.
• Before a VM1 on a withdrawable part
is moved it must be verified that the
circuit breaker is switched off. This is
the case when the mechanical position
indicator 6 shows the position "O" and
when "READY" is shining on the ready
lamp 2 while the breaker is supplied with
auxiliary voltage.
• Due to safety reasons, the circuit
breaker has to be treated as "switched
on" if the switching position can not be
clearly determined. In this case all high
voltage connections to the breaker have
to be de-energized and zero potential
on the primary side of the breaker has
to be confirmed prior to commissioning,
operation, maintenance or repair work.
• The discharge energy of the storage
capacitor is greater than 350 mJ. The
procedure for discharge of the storage
capacitor as set out in section 7.1 is to be
observed.
6.2 Preparatory activities (before
connecting the primary
voltage)
• Check the circuit breaker, withdrawable part,
contact arms, insulating parts etc. for damage,
and restore to their proper condition if necessary.
• Remove any dirt collected during transport,
storage or installation (particularly on the
insulating materials) as described in section 7.3.1.
• Remove lifting lugs T (Figures 10/1 to 10/7).
• Check the primary and secondary connections and
the protective earth conductor connection.
• Check the connection of the main earthing bar
with the station earthing conductor (DIN VDE
0141).
• Remove all material residues, foreign bodies and
tools from the switchgear.
• Properly refit all covers, etc., removed during
assembly and testing processes.
• Connect the supply voltage (Figures 9/16b and
10/10 to 10/13) - "READY" will shine. Inputs -RL1:
"Closing lock-out" and -MU
release" (if applicable) must be supplied with
power before the circuit breaker can be closed.
• For this reason, an internal circuit applies a
voltage of 80 V to the input -RL1 (Figure 9/16b), as
soon as the storage capacitor is charged in as-
delivered condition of devices with no connector
wiring.
• In case this input -RL1 is being used for an
interlocking with an external voltage, this internal
connection to 80 V has to be removed.
• "READY" will shine even if the closing operation is
blocked by inputs -RL1 or -MU
• If no voltage is applied to input -RL1, closing is
impossible.
• If no voltage is applied to input -MU
impossible in case of activated -MU
activated closing support (Figure 9/16a).
• Check mechanical and electrical interlocks for
effectiveness, without using force.
• Perform test closing and opening of the circuit
breaker by pressing push-buttons 3 and 4 (see
Figure 9/17).
• For any further questions on the functions of the
withdrawable circuit breaker part and its testing,
see section 7.5.
• Instruct the local operators in the fundamental
details of regular handling of the switchgear.
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