MV SWITCHGEAR – METAL-CLAD AND GIS

OBJECTIVES:
• Understand differences between Metal-Clad and GIS for MV applications.
• Select appropriate switchgear type based on project constraints.

KEY TOPICS:
• Metal-Clad vs Metal-Enclosed vs GIS.
• Withdrawable vs fixed circuit breakers.
• Internal arc classification (IAC – AFL/AFR).
• Compartmentalization (busbar, breaker, cable, LV).
• Applications: urban, industrial, offshore, rural.
• Cost, footprint, and maintenance comparison.

PRACTICAL FOCUS:
• Compare cost and footprint of Metal-Clad (33kV) vs GIS (33kV).
• Exercise: Propose switchgear type for urban substation (land constraint).
• Review real GIS and Metal-Clad drawings.

SUGGESTED DIAGRAMS:
• Metal-Clad cross-section.
• GIS single line and layout.
• Internal arc test setup.

KEY TAKEAWAYS:
• Ability to justify switchgear selection.
• Understanding of operational and maintenance requirements.

STANDARDS & REFERENCES:
• IEC 62271-200 (Metal-Clad), IEC 62271-203 (GIS).
• Client switchgear specifications.

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

PREREQUISITES:
• Completion of previous sessions (SLD, Layout, CB selection).