Installation; General; Unpacking; Storage - GE MVAX 11 Technical Manual

Service Manual
MVAX
1.

INSTALLATION

1.1

General

Protective relays, although generally of robust construction, require careful treatment prior to
installation on site. By observing a few simple rules the possiblity of premature failure is
eliminated and a high degree of performance can be expected.
Relays are either despatched individually or as part of a panel/rack mounted assembly in
cartons specifically designed to protect them from damage.
Relays should be examined immediately they are received to ensure that no damage has
been sustained in transit.
If damage has been sustained in transit, a claim should be made to the transport
company concerned immediately, and the nearest General Electric representative
should be promptly notified.
1.2

Unpacking

Care must be taken when unpacking and installing the relays so that none of the parts are
damaged or their settings altered, and must at all times be handled by skilled persons only.
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.
1.3

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 ambient 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.
The storage temperature range is –25°C to +70°C.
1.4

Relay mounting

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 centers.
For individually mounted relays these dimensions will also be found in Publications R6103
MVAX 11 and R6010 MVAX 12, 21, 31 and 91.
Publication R7012 is a Parts Catalogue and Assembly Instructions. This document will be
useful when individual relays are to be assembled as a composite rack or panel mounted
assembly.
Publication R6001 is a leaflet on the modular integrated drawout system of protective relays.
Publication R6014 is a list of recommended suppliers for the pre-insulated connectors.
R8010RB
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