Differential Protection of Alternator Explained | Merz-Price Scheme, CTs & Numerical Relay in Action

Unlock the core concept behind Differential Protection of Alternators — one of the most crucial protection systems used in power plants. In this video, we break down how this method detects and isolates internal faults using Merz-Price circulating current principle, current transformers (CTs), and modern numerical relays.
We’ll take you through clear visuals, fault scenarios, schematic diagrams, and a deep understanding of balancing resistors used to ensure accurate relay operation. Whether you're a student, electrical engineer, or preparing for exams like GATE, this is your complete visual guide.
🔌 What you'll learn in this video:
• How differential protection works in alternators
• Schematic arrangement and CT placement
• Fault detection and relay activation
• Role of numerical relays in modern systems
• Importance of balancing resistances
• Real-world limitations of protection coverage
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OUTLINE:

00:00:00 Introduction to Alternator Protection
00:01:01 Differential Protection Explained
00:01:41 Schematic Arrangement and Function
00:02:38 Relay Coil Connections and Operation
00:03:21 Fault Conditions and System Response
00:04:19 Modern Numerical Relay Implementation
00:05:09 Balancing Resistances for Accuracy
00:06:14 Limitations and Practical Considerations
00:07:02 Outro and Call to