Star Rated Transformers are energy efficient transformers started as a “Green Campaign”. These are transformers that carry standard specifications as per Bureau of Energy Efficiency (BEE). The referred Indian Standard are IS1180 (part 1) Outdoor type three-phase distribution transformers upto and including 200kVa, 11kV – specification, IS2026 (part 2). The standard ratings covered under this pilot energy labelling scheme is 16, 25, 63, 100, 160 and 200kVa and non standard ratings from 16 to 200kVa.
The salient feature of the star rating transformer is the fact that only total losses are specified, both at 50% loading and at 100% loading, so that the manufacturer may use his design expertise and optimum materials to achieve the given losses. Individual loss figures (no load loss and load loss) are not specified.

Star Rated Transformers are energy efficient transformers started as a “Green Campaign”. These are transformers that carry standard specifications as per Bureau of Energy Efficiency (BEE). The referred Indian Standard are IS1180 (part 1) Outdoor type three-phase distribution transformers upto and including 200kVa, 11kV – specification, IS2026 (part 2). The standard ratings covered under this pilot energy labelling scheme is 16, 25, 63, 100, 160 and 200kVa and non standard ratings from 16 to 200kVa.
The salient feature of the star rating transformer is the fact that only total losses are specified, both at 50% loading and at 100% loading, so that the manufacturer may use his design expertise and optimum materials to achieve the given losses. Individual loss figures (no load loss and load loss) are not specified.