StandardsInternational : IEC 60076
National : NF C 52-100; NF C 52-100; NF C 52-112/1; NF C 52-112/1
These transformers are manufactured by NEXANS MAROC under ALSTOM licence.
The usual powers are: 5-10-20-36 and 47MVA. We can find other powers as: 7.5- 12 and 15MVA
HV: 60 or 63KV
MV: From 5.5 up to 22KV on load
It can be by:
ONAN system: Natural circulation of oil in radiators cooled by the ambien air
ONAF system: Air circulation by motor driven fans
ODAF system: Forced oil circulation in an aero-refrigerant
It is done on the the high voltage winding and is available in two designs:
-Off-load regulation with manually controlled tap-chagerwith 3 or 5 positions
-On-load regulation on full scale of 17 or 21 steps.
Special design studies are required in order to answer to customer needs.