ABB REB500 Commissioning Manual

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Contents

ABB REB500 Commissioning Manual Manual pdf 23 page image

1MRK 505 351-UEN Section 3MaintenanceCommissioning Manual 15Distributed busbar protection REB500Section 3 Maintenance3.1 Periodic MaintenanceDepending on the ambient conditions, we recommend removing the dust (e.g. witha vacuum cleaner) and wiping the front of the LCD with a damp cloth (perhapswith a little washing up liquid) from time to time. Do not use petrol or cleaningagents containing alcohol.The REB500 includes continuous and comprehensive self-supervision anddiagnosis of the software and hardware components. Since the protection functionsare implemented and computed in software, they do not require any periodicmaintenance.The protection equipment, however, is only part of the overall protection system,we recommend periodically checking all the parts that are not automaticallysupervised.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 HMI3.2 Replacing unitsThe best time to replace assemblies is when the station is out of operation, but evenin this case, care must be taken that no unintentional operation of switchgear cantake place (danger to persons close to the item of plant).While the station is in operation, care must be taken that the station is stilladequately protected when REB500 is switched off.

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