Primary – MECHANICAL INTERLOCKING SLD

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OBJECTIVES: 

• Understand the purpose of mechanical interlocking for operator safety. 
• Design interlocking schemes to prevent unsafe operations.
• Integrate interlocking logic into SLD.   

KEY TOPICS: 

• Interlocking logic between disconnectors and circuit breakers. 
• Key interlock systems (Castell, SEL, Kirk). 
• Integration with SLD and mimic panels. 
• Maintenance isolation requirements. 
• Interlocking for busbar earthing switches. 

PRACTICAL FOCUS: 

• Case study: Incorrect interlocking leading to hazard or flashover. 
• Exercise: Develop a mechanical interlocking SLD for a double busbar scheme. 
• Review the real project interlocking schedule

SUGGESTED DIAGRAMS: 

• Mechanical interlocking logic diagram. 
• Key interlock sequence chart. 
• Interlocking SLD with lock symbols. 

KEY TAKEAWAYS: 

• Ability to design safe switching sequences. 
• Understanding of maintenance isolations

STANDARDS & REFERENCES: 

• IEC 62271, SSEN interlocking standards. 
• Manufacturer manuals (Castell, SEL). 

CERTIFICATION & DELIVERY: 

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

PREREQUISITES: 

• Completion of Session 01 (SLD). 
• Familiarity with disconnectors and earth switches.