Supply Of Oil Cooling Unit For Transformer/converter Including Motor. Specn/ Drg. No. As Given Below: 1 Oil Cooling Unit For Transformer/converter With Aluminium Impeller And Casing Relevant Specn/drg No. Clw/es/3/0647 Alt-e. 2 30kw Motor For Cooling Unit Centrifugal Design Specification: Rdso Spec No. E- 10/3/09 Motor With Amendment No. 1 To 6.