Abstract: A distribution substation including a transformer module and a feeder module. The transformer module including a tank, a transformer having primary and secondary windings immersed in insulating oil within the tank, a radiator connected to the tank for cooling the oil in the tank, a primary bushing mounted on one of the side walls of the tank at an angle and being connected to the primary of the transformer, a secondary bushing mounted on the top of the tank connected to the secondary winding of the transformer, a primary circuit breaker mounted on the tank in close proximity to the primary bushing, a lightning arrester mounted on the top of the tank in close proximity to the primary bushing. The feeder module including a transition cubicle and a feeder cubicle.