Installation; Precautions; Packing; Inspection - Melitta LOOK Operating Instructions Manual

Section 3. INSTALLATION
3.1

Precautions

Protective relays, although generally of robust construction, require careful treatment
prior to installation and a wise selection of site. By observing a few simple rules the
possibility of premature failure is eliminated and a high degree of performance can
be expected.
3.2

Packing

The relays are either despatched individually or as part of a panel/rack mounted
assembly, in cartons specifically designed to protect them from damage.
3.3

Inspection

Relays should be examined immediately they are received to ensure that no damage
has been sustained in transit. If damage due to rough handling is evident, a claim
should be made to the transport company concerned immediately, and the nearest
ALSTOM T&D Protection & Control representative should be promptly notified.
Relays which are supplied unmounted and not intended for immediate installation
should be returned to their protective polythene bags.
3.4

Unpacking

Care must be taken when unpacking and installing the relays so that none of the
parts is damaged or their settings altered; they should only be handled by skilled
persons.
Relays should be examined for any wedges, clamps or rubber bands necessary to
secure moving parts to prevent damage during transit and these should be removed
after installation and before commissioning.
Relays which have been removed from their cases should not be left in situations
where they are exposed to dust or damp. This particularly applies to installations
which are being carried out at the same time as constructional work.
3.5

Storage

If relays are not installed immediately upon receipt they should be stored in a place
free from dust and moisture in their original cartons and where de-humidifier bags
have been included in the packing they should be retained. The action of the de-
humidifier crystals will be impaired if the bag has been exposed to humid conditions
and may be restored by gently heating the bag for about an hour, prior to replacing
it in the carton.
Dust which collects on a carton may, on subsequent unpacking, find its way into the
relay; in damp conditions the carton and packing may become impregnated with
moisture and the de-humidifying agent will lose its efficiency.
Storage temperature –25 to +70°C.
3.6

Siting

The installation should be clean, dry and reasonably free from dust and excessive
vibration. The site should preferably be well illuminated to facilitate inspection.
An outline diagram is normally supplied showing panel cut-outs and hole centres.
For individually mounted MVTU relays these dimensions will also be found in
Publication R6041.
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