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Transformer site acceptance tests including electrical tests and functional tests.

Electrical Tests

1. Insulation Resistance Test: Measure the insulation resistance between windings and between windings to ground to verify integrity.

2. Dielectric Strength Test (Hi-Pot Test): Apply a high voltage to check the transformer's ability to withstand electrical stress without breakdown.

3. Winding Resistance Test: Measure the resistance of each winding to detect any abnormalities.

4. No-Load Test: Perform with the transformer energized but without load to measure no-load losses and excitation current, indicating core condition and efficiency.

5. Load Test: Apply a specified load to the transformer and measure voltage drops, currents, and losses to confirm performance under actual operating conditions.

6. Temperature Rise Test: Monitor the temperature rise of the transformer under rated load to ensure it stays within allowable limits.

Functional Tests

1. Control and Protection System Verification: Test all control and protection functions, including Buchholz relay, oil level indicators, temperature sensors, and cooling systems.

2. Auxiliary Systems Check: Inspect and test auxiliary systems like fans, pumps, and heating systems for correct operation.
   

3. Interlocking and Safety Features: Verify that all interlocks and safety mechanisms function correctly, preventing unauthorized access or operation under unsafe conditions.