ABB Relion REB500, Commissioning Manual

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1MRK 505 351-UEN
Section 3
Maintenance
Commissioning Manual 15
Distributed busbar protection REB500
Section 3 Maintenance
3.1 Periodic Maintenance
Depending on the ambient conditions, we recommend removing the dust (e.g. with
a vacuum cleaner) and wiping the front of the LCD with a damp cloth (perhaps
with a little washing up liquid) from time to time. Do not use petrol or cleaning
agents containing alcohol.
The REB500 includes continuous and comprehensive self-supervision and
diagnosis of the software and hardware components. Since the protection functions
are implemented and computed in software, they do not require any periodic
maintenance.
The protection equipment, however, is only part of the overall protection system,
we recommend periodically checking all the parts that are not automatically
supervised.
The following components have to be tested periodically:
·
all external circuits (e.g. tripping, BFP starting, CT and VT, etc.)
·
all external switching devices (circuit-breakers and isolators)
·
all REB500 tripping and signaling contacts
·
all REB500 optocoupler inputs
·
all REB500 analog inputs
·
the local HMI
3.2 Replacing units
The best time to replace assemblies is when the station is out of operation, but even
in this case, care must be taken that no unintentional operation of switchgear can
take place (danger to persons close to the item of plant).
While the station is in operation, care must be taken that the station is still
adequately protected when REB500 is switched off.