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power transformer type test

Preparation Phase

Review the testing requirements and standards applicable to the transformer type.

Ensure that the transformer is correctly installed and accessible for testing.

Gather necessary test equipment and tools, ensuring they are calibrated and in good working condition.

Prepare a safety plan, including necessary PPE and emergency procedures.

Visual Inspection

Inspect the transformer for physical damage or leaks.

Check all connections and terminations for tightness and integrity.

Verify labeling and identification plates for correctness.

Insulation Resistance Tests

Perform insulation resistance testing on windings to ground.

Record insulation resistance values and compare them against specified limits.

Conduct polarization index (PI) testing if required.

Power Factor Testing

Measure the power factor of the transformer insulation system.

Compare power factor values against manufacturer specifications.

Transformer Turns Ratio (TTR) Test

Perform turns ratio testing on all windings.

Document the turns ratio measurements and compare with design specifications.

Sweep Frequency Response Analysis (SFRA)

Conduct SFRA to assess mechanical integrity and winding displacement.

Analyze results for signs of deformation or winding movement.

Temperature Rise Test

Perform the temperature rise test under controlled load conditions.

Measure and record temperature differences between winding and ambient temperature.

Short-Circuit Impedance Test

Test the short-circuit impedance (or voltage drop) of the transformer.

Compare the results with the design specifications.

Frequency Response Test

Conduct frequency response testing to evaluate frequency characteristics.

Analyze the data for any anomalies that may indicate issues.

Vacuum and Pressure Tests

If applicable, perform vacuum and pressure tests on the transformer tank.

Ensure no leaks are present and the integrity of the tank is maintained.

Functional Testing

Test all protective relays and control systems for correct operation.

Conduct operational tests to verify that the transformer operates as intended under load.

Documentation

Compile all test results and document any discrepancies or issues encountered.

Prepare a comprehensive test report summarizing findings and recommendations.

Final Review

Review all test results with the engineering team for validation.

Discuss any necessary follow-up actions or repairs based on the test outcomes.

Archiving

Archive all documentation and test records for future reference and compliance.

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