Air cooled transformers
Dry type air cooled transformers can be manufactured suitable for indoor or outdoor application, They are widely used for marine and offshore service and are fitted where it is not possible to fit liquid filled equipment, such as in the roof of a building or other confined areas. The modern insulation systems and materials employed in these transformers are Class F, H and C.
Minimum periodic maintenance is required.
Illustrated - right
Set of three 11000 Volts ± 2.5% / 5% // 271 Volts, Hexaphase, 2 x 1251 kVA, 50 Hz, Class H, insulated dry type transformer with 100 Volt, IPT assembly for Middle East application.
Left - One of two dry type naturally air cooled transformers, Class C, insulation system, being fitted on the base of an IP23 robust sheet steel cubicle.
The equipment is for use offshore on an oil platform rig.
Ratio: 6000Volts //
600 / 440 Volts,
3 phase, 60 Hz,
group rating each
transformer 6MVA,
connection delta //
delta / star,
loosely coupled windings.
In addition to routine
and temperature rise
type testing, the
equipment was also
successfully lightning
impulse voltage
BIL (Break Impulse
Level) tested.
.