Power Transformers Market (By Core: Closed, Shell, Berry; By Winding: Two Winding, Auto-Transformer; By Installation: Outdoor, Indoor; By Cooling: Dry type, Oil Immersed; By Phase: Single phase, 3 - phase; By Application: Residential & Commercial, Utility, Industrial) - Global Industry Analysis, Market Size, Opportunities and Forecast 2021 - 2028