POWER, EARTHING, AND AUXILIARY TRANSFORMERS

OBJECTIVES:
• Understand selection and application of power, earthing, and auxiliary transformers.
• Specify transformer parameters for projects.

KEY TOPICS:
• Power transformers (ONAN/ONAF, vector groups, impedance).
• Earthing transformers (zig-zag, neutral earthing resistor).
• Auxiliary transformers (station service, LVAC supply).
• Cooling classes, tapping ranges, and accessories.
• Transformer specification sheet preparation.

PRACTICAL FOCUS:
• Prepare transformer specification for 132/33kV 60MVA unit.
• Exercise: Select earthing transformers for 33kV system.
• Review real transformer datasheets.

SUGGESTED DIAGRAMS:
• Transformer nameplate parameters.
• Earthing transformer connection diagram.
• Auxiliary transformer SLD.

KEY TAKEAWAYS:
• Ability to specify transformers for different applications.
• Understanding of earthing requirements.

STANDARDS & REFERENCES:
• IEC 60076, IEEE C57.
• Client transformer specifications.

CERTIFICATION & DELIVERY:
• Certificate of Completion awarded.
• Delivery Mode: Online (On-demand).

PREREQUISITES:
• Basic transformer knowledge.