Power & instruments transformers

Contents:

• Transformer Theory
• Mutual Induction, Turns Ratio, Impedance Ratio, Efficiency, Theory of Operation, Voltage Ratio, Current Ratio, Three-Phase Transformer Connections, Delta Connection, Wye Connection, Combinations of Delta and Wye Transformer Connections, Transformer Losses and Efficiency, Transformer Operation Under No-Load Coil Polarity, Transformer Theory Summary.
• Transformer Types
• Different types of transformers, Power Transformer, Control Transformer, Auto Transformer, Isolation Transformer, Instrument Potential Transformer, Instrument Current Transformer, Transformer Types Summary.
• Types of Power Transformer
• Oil Immersed Power Transformers, Dry type Power Transformers, Special Power Transformers
• Protection of Transformers
• Maintenance Testing Overview
• Insulation tests, DC tests, Insulation resistance tests, High-potential testing, AC tests, Power-factor testing dielectric loss angle (DLA) testing, Transformer turns ratio (TTR) testing, Infrared scanning, Oil testing, Grounding tests, Grounding electrode test, Two-point resistance tests, Soil resistivity test, Functional testing, Functional testing, Testing procedures and specifications, Sources of electrical equipment testing and maintenance information, NFPA 70B-1998, Electrical Equipment Maintenance.

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