CATALOGUE

The EdM technology
Low voltage winding
The Low Voltage winding, made with special
automatic winding machines, consists of one
aluminium strip with an intermediate class F or
class H insulating sheet.
This solution gives the winding a certain
compactness capable of forming a one-piece
cylinder that can withstand possible axial
and radial stresses resulting from short circuit
phenomena within the system and at the
downstream side of the transformer.
All the welds of the conductor strip with the
output bars are made by butt welding in inert
atmosphere and under electronic control, so as to
avoid possible damage.
This winding is then vacuum-impregnated
with epoxy resin so as to give it the required
compactness and uniformity and to avoid the
absorption of humidity throughout the life of
the machine, whatever environment it needs to
operate in.
This treatment also allows EdM cast resin
transformers to comply with the F1 classification
according to the Standards and IEC 60076-11.
LV winding system
EdM
CAST RESIN TRANSFORMERS
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HIGH POWER GENERAL CATALOGUE