The protection we need to take when install Oil Immersed Transformer

When installing an oil-immersed transformer, several key protection measures must be taken to ensure safety, reliability, and longevity of the equipment. Here are the essential protections to implement:

1. Buchholz Relay (for conservator-type transformers)

Detects gas accumulation due to internal faults or oil level changes.

Triggers alarms or trips the breaker during serious internal faults.

2. Oil Temperature Protection

Uses temperature sensors to monitor oil temperature.

High temperature triggers alarms or trips to prevent overheating.

3. Winding Temperature Protection

Monitors transformer winding temperature through embedded sensors or thermal image relays.

Helps prevent insulation damage.

4. Pressure Relief Device

Provides mechanical protection against excessive internal pressure buildup.

5. Oil Level Indicator (OLI)

Ensures that oil is maintained at a safe level; low levels can lead to overheating or insulation failure.

6. Breather with Silica Gel

Prevents moisture ingress while allowing air exchange.

Silica gel color change indicates need for replacement.

7. Surge Arresters

Protect against overvoltages from lightning or switching operations.

8. Earth Fault and Differential Protection

Detects internal faults and ensures quick disconnection from the system.

9. Overcurrent Protection

Prevents damage from excessive load currents.

10. Proper Grounding and Bonding

Prevents build-up of dangerous voltages and ensures safety for maintenance staff.

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