Transformer Differential Protection and REF (Restricted Earth Fault)

Objectives
• Understand transformer protection differential schemes.
• Learn REF (Restricted Earth Fault) application.
• Analyze stability and inrush.

Key Topics
• 87T differential protection.
• REF (Restricted Earth Fault) principles.
• Inrush and harmonic restraint.
• CT matching and vector group

Practical Focus
• Differential setting example
• REF scheme review.

Suggested Diagrams
• Differential curve.
• REF scheme diagram.

Key Takeaways
• Ability to propose transformer differential settings.
• Ability to understand restricted earth fault scheme.

Standards & References
• Vendor and manufacturer’s manuals.
• ESI – Standard for Electricity Supply Industry.

Certification & Delivery
• Certificate of Completion awarded.
• Delivery Mode: Online (On-demand).
• Corporate and customized training available on request.

Prerequisites
• Transformer basics and Restricted Earth Fault
Schemes.