ABB
24
Uniswitch Operation and
Maintenance Manual
UNIS14GB 05-02
• Check readiness for operation and the switching status of electrical
systems upstream and downstream of the switchgear.
Reference For any other matters regarding operation of the withdrawable circuit-
breaker part and testing facilities for the withdrawable part, see section
5.6.
Other checkpoints Depending on the allocation of responsibilities, it may also be necessary
to check the following equipment in areas adjacent to the switchgear:
• power cables
• auxiliary cables
• auxiliary power source
• remote control system
• complete earthing system
• switchroom equipment
• switchroom conditions
4.2.2 Start-up
Instructions
• Comply with all relevant safety regulations.
• Ensure that the switch-disconnectors and circuit-breakers in the
system are in the OPEN position.
• Remove any existing earthing and short circuiting connections in the
critical switching area.
• Energize the feeder cables.
• Connect the switchgear step by step, observing the signals and
indicators.
• Check that relative conductors are in phase, where necessary,
when there are several incoming feeder cables and switchgear
sections.
• Carry out all measurements and check all functions which depend
on the high-voltage power supply being connected.
• Watch out for irregularities of any kind.
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