Protection Notes – Part 1: Feasibility & Overall Strategy

Objectives
• Learn to define an overall protection strategy at the feasibility stage.
• Understand the factors influencing protection scheme selection.
• Produce high-level protection notes for a project.

Key Topics
• Feasibility Considerations: Grid code compliance, fault level studies, clearance times.
• Overall Strategy: Redundancy (main & back-up protection), stability requirements, and selectivity.
• Scheme Selection: When to use distance, overcurrent, or differential protection for feeders.
• Interface with system studies (load flow, short circuit).
• Defining zones of protection.

Practical Focus
• Workshop: Developing a protection philosophy for a new 132/33kV substation.
• Reviewing a single line diagram and proposing zones of protection.

Suggested Diagrams
• A single line diagram of a substation with clearly marked primary and backup protection zones.
• Flowchart for selecting protection schemes based on voltage level and configuration.

Key Takeaways
• Ability to develop a coherent and compliant protection strategy for new projects.
• Skills to write clear and concise protection philosophy notes.

Standards & References
• National Grid / Utility specific Protection Policies.
• IEC 60255 series – Measuring relays and protection equipment.

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