dry cast resin transformer

11kv dry type transformer are available in three general classes of insulation. The main features of insulation are to provide dielectric strength and to be be able to withstand certain thermal limits. dry electric transformer insulation classes are 220(degrees) C (Class H). 185 (degrees) C (Class F), and 150 (degrees) C (Class B). Temperature rise ratings are based on full-load rise over ambient (usually 40 (degrees) C above ambient and are 150 (degrees) C (available only with Class H insulation), 115 (degrees) C (available with Class H and Class F insulation) and 80 (degrees) C (available with Class H, F, and B insulation). A 30 (degrees) C winding hot spot allowance is provided for each class of dry cast resin transformer.