Introductory technical guidance for electrical engineers and construction managers interested in electric power step-up transformers. Here is what is discussed:1. INTRODUCTION2. PRINCIPLE OF OPERATION3. TRANSFORMER VOLTAGE AND CURRENT4. THE MAGNETIC CIRCUIT5. CORE LOSSES6. COPPER LOSSES7. TRANSFORMER RATING8. PERCENT IMPEDANCE9. INTERNAL FORCES10. AUTOTRANSFORMERS11. INSTRUMENT TRANSFORMERS12. POTENTIAL TRANSFORMERS13. CURRENT TRANSFORMERS14. TRANSFORMER TAPS15. TRANSFORMER BUSHINGS16. TRANSFORMER POLARITY17. SINGLE-PHASE TRANSFORMER CONNECTIONS FOR TYPICAL SERVICE TO BUILDINGS18. PARALLEL OPERATION OF SINGLE-PHASE TRANSFORMERS FOR ADDITIONAL CAPACITY19. THREE-PHASE TRANSFORMER CONNECTIONS20. WYE AND DELTA CONNECTIONS21. THREE-PHASE CONNECTIONS USING SINGLE-PHASE TRANSFORMERS22. PARALLELING THREE-PHASE TRANSFORMERS23. METHODS OF COOLING24. OIL-FILLED - SELF-COOLED TRANSFORMERS25. FORCED-AIR AND FORCED-OIL-COOLED TRANSFORMERS26. TRANSFORMER OIL27. CONSERVATOR SYSTEM28. OIL-FILLED, INERT-GAS SYSTEM29. INDOOR TRANSFORMERS.