Liquid-immersed Distribution Transformers • TRANSTECH TRANSFORMERS LLC

Multi-step lap, grain-oriented, cold-rolled, silicon alloyed, electric sheet steel core with insulation on both sides
Strip or flat-wire low-voltage copper or aluminum windings
Round or profile wire elliptical high voltage copper or aluminum windings
Epoxy resin coated insulation paper
Large scale winding oil channels
Multi-coat surface protection tailored to client operating requirements

Low core mechanical tension
Winding protection against electrical and mechanical stress
Ample cooling for elimination of winding hot spots
Short-circuit and surge proof
External protection against corrosion, temperature fluctuations, humidity and other environmental factors
Easy to handle, operate and maintain

Product Specification

Type	Hermetically sealed with or without gas cushion Breathing type with or without conservator
Rated Power	Up to 6.3 MVA
Voltage Class	Up to 36 kV
Tank Construction	Corrugated fin wall tank or plain wall tank with radiator (Bolted or welded cover)
Winding Material	Copper/ Copper, Aluminum/ Aluminum (or as requested)
Basic Insulation Level	Up to 200 kVp
Phases	3 Phase
Tappings	2± x 2.5 % (or different range or as requested)
Voltage Regulations	With off-circuit tap changer
Rated Frequency	50 Hz or 60 Hz
Vector Groups	According to IEC standards
Material Thermal Class Insulation	According to IEC 60085 class A
Temperature Rise	As per IEC 60076 or as requested
Type of Cooling	ONAN (Oil Natural Air Natural) or other type of cooling like ONAF, KNAN
Dielectric Liquid	Mineral oil according to IEC standard, silicon oil or synthetic ester
Short-circuit Withstand Ability	The transformers are designed to withstand the thermal and the dynamic effects resulting from a secondary short-circuit in accordance with IEC 60076-5
Sound Level	EC 60076-10 or NEMA – TR1 or as requested
Installations	Indoor or outdoor
HV/ LV Terminals	HV Terminals: Plug-in or porcelain bushings with or without cable box LV Terminals: Cast resin, bar type or porcelain bushings with or without cable box, Cable box if required can be air insulated or fully insulated as per BS EN 503366:2002,(IP55 class or as requested)