Transformer Protection Devices Explained | Buchholz Relay, REF, Differential, OTI, WTI Working

In this video, we have explained Transformer Protection Devices in simple and easy language.

✅ What is Buchholz Relay and how it detects internal faults
✅ How Differential Relay 87T protects a transformer
✅ Working of REF Relay / Restricted Earth Fault Protection
✅ Difference between OTI and WTI and their working
✅ Over Current Relay and Earth Fault Protection
✅ Use of MOG, PRV, Sudden Pressure Relay, and Tripping Relay
✅ How Lightning Arrester protects the transformer from surge voltage
✅ How alarm and trip signals work in transformer protection

This video is very useful for electricians, electrical technicians, ITI students, diploma students, and anyone working in electrical maintenance or power systems.

Watch the full video to understand how a transformer is protected from burning, internal damage, pressure rise, and major faults.

📌 Topics Covered:
In this video, we explained transformer protection devices including Buchholz Relay, OTI, WTI, MOG, Silica Gel Breather, PRV, Differential Protection 87T, REF Protection 64H, Over Current Protection, and DO Fuse Protection.

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Time Stamp
00:00 Transformer Protection Devices Explained
00:36 Transformer me kaun-kaun se fault aate hain?
01:13 Buchholz Relay kya hota hai?
01:58 Buchholz Relay Internal Fault kaise detect karta hai?
04:26 Buchholz Relay Alarm aur Trip Working
05:21 OTI – Oil Temperature Indicator Working
07:13 OTI Alarm and Trip Circuit
08:27 WTI – Winding Temperature Indicator Working
09:41 OTI and WTI Temperature Setting in Transformer
13:40 MOG – Magnetic Oil Gauge Working
10:15 Transformer Oil Level Low Protection
13:41 Silica Gel Breather ka kaam
14:56 PRV – Pressure Relief Valve Working
15:57 Differential Protection 87T Working
19:35 REF Protection – Restricted Earth Fault Relay
23:32 Over Current Protection in Transformer
24:52 DO Fuse Protection Working