Mineral oil or synthetic fluid filled equipment are robust can be installed indoors or outdoors in harsh environments and require minimum periodic maintenance.

Illustrated - right
A range of mineral oil filled, outdoor transformers for rail traction applications Ratio: 33 kV + 7.5%, ± 5%, ± 2.5 % // 2 x 294 Volts, 3 phase, 50 Hz Ratings for: 2.5, 3 and 4 MW 12 pulse series bridge systems.