48V & 110V DC Battery Systems (Review & Loading)

Objectives
• Understand the roles of 48V (telecom/control) and 110V (protection/trip) DC systems.
• Learn to review battery sizing and loading calculations.
• Identify components of a DC auxiliary system: battery, charger, distribution.

Key Topics
• System Architectures: 48V for communications, HMI, and remote I/O; 110V/125V for protection, control, and trip circuits.
• Battery Types: Vented Lead-Acid (VLA), Valve-Regulated Lead-Acid (VRLA), Nickel-Cadmium (Ni-Cd).
• Battery Loading Calculations: Continuous loads (relays, panels), momentary loads (trip coils, spring charging motors), and emergency backup time.
• Charger Sizing: Meeting continuous load, recharging capacity, and redundancy (N+1).
• DC Distribution: MCB selection and discrimination, DC board configurations.

Practical Focus
• Walk-through of a battery sizing calculation using IEEE 485 method.
• Case study: Reviewing a 110V DC scheme during a station blackout.

Suggested Diagrams
• Single Line Diagram of a 110V DC system with dual battery banks and chargers.
• Load profile curve for a substation during a 24-hour emergency period.

Key Takeaways
• Ability to review and validate DC system designs.
• Understanding of the critical role of DC power in substation automation and protection.

Standards & References
• IEEE 485 – Recommended Practice for Sizing Lead-Acid Batteries for Stations.
• IEEE 946 – Recommended Practice for the Design of DC Auxiliary Power Systems.

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