REF Protection Made Easy | Transformer Restricted Earth Fault Scheme Explained

Описание: Restricted Earth Fault (REF) protection is one of the most sensitive protection schemes used in power transformers, especially for detecting internal earth faults near the neutral point.
In this video, you will learn the complete working principle of REF protection in transformers, including CT connections, relay operation, spill current concept, internal vs external fault behavior, and why REF is more sensitive than differential protection for certain faults.

✅ Topics Covered in This Video:
✔ What is Restricted Earth Fault (REF) protection?
✔ Internal earth fault vs external fault explanation
✔ Why differential protection is not sensitive near neutral point
✔ REF relay working principle with CT secondary connections
✔ Spill current formation and tripping logic
✔ Importance of PS class CTs in REF scheme
✔ Backup protection using overcurrent relay

📌 If you are learning power system protection, transformer protection schemes, and numerical relays, this video will be very helpful.

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