This book will be useful for fresh graduate and post graduate Electrical engineering students & Working professional. This book convers basic Design concept with theory and practical project calculation related to Transformer & it will be a very good handbook for fresh engineer & also experienced professionals. This book contains following THEORY AND PRINCIPLES AIR CORE TRANSFORMER IRON OR STEEL CORE TRANSFORMER TYPES OF TRANSFORMERS POWER TRANSFORMERS INTRODUTION RATING AND CLASSIFICATIONS INSULATION CLASS COOLING CLASSES SHORT-CIRCUIT DUTY EFFICIENCY, LOSSES, AND REGULATION CONSTRUCTION(CORE, WINDINGS) TAPS-TURNS RATIO ADJUSTMENT,ACCESSORY EQUIPMENT LIQUID-PRESERVATION SYSTEMS “BUCHHOLZ” RELAY 31 GAS-ACCUMULATOR RELAY INRUSH CURRENT TRANSFORMERS CONNECTED DIRECTLY TO GENERATORS MODERN AND FUTURE DEVELOPMENTS HIGH-VOLTAGE GENERATOR TEMPERATURE SUPERCONDUCTING (HTS) TRANSFORMER DISTRIBUTION TRANSFORMERS GENERAL TRANSFORMER DESIGN TRANSFORMER CONNECTIONS SINGLE-PHASE PRIMARY CONNECTIONS THREE-PHASE CONNECTIONS OPERATIONAL CONCERNS TRANSFORMER LOSSES TRANSFORMER PROTECTION GOALS OF PROTECTION ECONOMIC APPLICATION PHASE-SHIFTING TRANSFORMERS RECTIFIER TRANSFORMERS BACKGROUND AND HISTORICAL PERSPECTIVE DRY-TYPE TRANSFORMERS TRANSFORMER TAPS COOLING CLASSES FOR DRY-TYPE TRANSFORMERS WINDING INSULATION SYSTEM SURGE PROTECTION FOR TRANSFORMER INSTRUMENT TRANSFORMERS APPLICATIONS OF REACTORS CURRENT-LIMITING REACTORS NEUTRAL-GROUNDING REACTORS TRANSFORMER CONNECTIONS POLARITY OF SINGLE-PHASE TRANSFORMERS ANGULAR DISPLACEMENT OF THREE-PHASE TRANSFORMERS THREE-PHASE TRANSFORMER CONNECTIONS TRANSFORMER TESTING POWER TRANSFORMER PROTECTION TRANSFORMER DIFFERENTIAL PROTECTION MAGNETIZING INRUSH, OVEREXCITATION, AND CT SATURATION TRANSFORMER OVEREXCITATION ON-LINE MONITORING OF LIQUID-IMMERSED TRANSFORMERS LOAD TAP CHANGERS TRANSFORMER SIZING CALCULATION 122 GENERATOR STEP UP TRANSFORMER SIZING CALCULATION AUXILIARY TRANSFORMER SIZING CALCULATION