Guarding Against Loss in Transformers
Distribution transformers are expected to convert up to 95-98% of the input power into usable output power. A distribution transformers installed within the distribution system gets overloaded. Sizing distribution transformers to meet their expected loading greatly influences transformer efficiency. Oversized transformers could contribute to inefficiency, but while transformers are appropriately matched to their loads, efficiency increases.
Therefore, when the transformer is extremely lightly loaded, the no-load loss of the transformer becomes a prominent element of the input energy and leads to a high percentage energy loss. Specifying a low core loss DT (such as amorphous core transformers) can avoid high energy loss.