REVISION IN IS 1180: HIGHLIGHTED POINTS (PART 1)

Recently Bureau of Indian Standards issued the Fourth revision of IS 1180 (Part1): Outdoor Type Oil Immersed Distribution Transformers upto 2500kVA, 33KV Specification.

Some of the major highlighted points are as below:

In revised IS, transformers have been divided in three categories, which are as below:

a) Three phase distribution transformers upto and including 200KVA

b) Three phase distribution transformers higher than 200KVA upto and including 2500KVA

c) Single phase distribution transformers upto and including 25KVA

In revised IS specification, losses for each rating for each category have been defined in three levels which are denoted by as follows;

a) Energy Efficiency Level 1,

b) Energy Efficiency Level 2

3) Energy Efficiency Level 3

In each level maximum losses (No Load Loss + Load Loss) at 50% load & 100% load have been specified for each rating in all categories. Losses in Energy Efficiency Level 1 is almost equal to ECBC 2009 guidelines.

In revised IS 1180 there are also some change in oil & winding temperature rise parameters for each category and also included the specification for corrugated type transformers.

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