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If you are involved in transformer (oil immersed) maintenance in your company, here is a list of common tests required to be done on oil immersed transformers according to IEC 60076-1 :
| Routine Tests |
| Measurement of winding resistance |
| Measurement of voltage ratio and check of phase displacement |
| Measurement of short-circuit impedance and load loss |
| Measurement of no-load loss and current |
| Dielectric routine tests |
| Tests on on-load tap-changers, where appropriate |
| Special Tests |
| Dielectric special tests |
| Determination of capacitances windings-to-earth, and between windings |
| Determination of transient voltage transfer characteristics |
| Zero-sequence impedance(s) on three-phase transformers |
| Short-circuit withstand test |
| Determination of sound levels |
| Measurement of the harmonics of the no-load current |
| Measurement of the power taken by the fan and oil pump motors |
| Measurement of insulation resistance to earth of the windings, and/or measurement of dissipation factor (tan δ) of the insulation system capacitances |
| Type Tests |
| Temperature-rise test |
| Dielectric type tests |
