⚡🌡️ What Is OTI in a Transformer? | Oil Temperature Indicator

 ⚡🌡️ What Is OTI in a Transformer? | Oil Temperature Indicator

An OTI (Oil Temperature Indicator) monitors the temperature of the insulating oil inside an oil-filled transformer. It helps operators identify overheating and may initiate alarms or cooling controls.

🔧 How It Works

1️⃣ Temperature Sensing

A temperature-sensing bulb or probe measures the transformer oil temperature.

2️⃣ Temperature Indication

The indicator displays the measured oil temperature, commonly in °C.

3️⃣ High-Temperature Alarm 🚨

If the temperature reaches a preset threshold, the OTI may activate an alarm.

4️⃣ Cooling Control

Depending on the transformer design, contacts may start cooling fans or pumps.

5️⃣ Trip Function

Some installations provide a high-high temperature trip, subject to the protection scheme.

🔄 Simple Sequence

Oil Temperature Rises → OTI Senses → Temperature Display → Alarm / Cooling Control → Trip If Configured

💡 Key Point: OTI measures oil temperature; it is different from a Winding Temperature Indicator (WTI), which estimates or measures winding temperature using its own sensing arrangement.

⚠️ Alarm, cooling and trip settings must follow the transformer manufacturer's recommendations and approved protection scheme.

Save this for your next electrical/MEP project! ⚡🔧

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