12 MVA Three Phase Power Transformer

The 12 MVA three-phase power transformer features a sealed tank structure and operates at a high voltage of 38 kV and a low voltage of 13.2 kV. It is meticulously designed and constructed in accordance with the ANSI C57 standard. Employing a two-stage air cooling system, this transformer ensures efficient heat dissipation.With a temperature rise specification of 55℃/65℃, the transformer is capable of achieving a rated capacity of 12 MVA at a 55℃ temperature rise, extendable up to 20 MVA. Similarly, at a 65℃ temperature rise, it boasts a rated capacity of 13.5 MVA, with the maximum capacity reaching 22.5 MVA.

Three Phase Power Transformer Specifications

12MVA Power Transformer Picturers

Testing Procedure

• By IEEE Std C57.12.00 standards, the following tests are conducted:
• Appearance check
• Transformer oil test
• Measurement of dissolved gases in transformer oil
• Measurement of voltage ratio and verification of phase displacement
• Measurement of winding resistance
• Measurement of DC insulation resistance between each winding to earth and between windings
• Check of core and frame insulation for liquid-immersed transformers with core or frame insulation
• Measurement of determination and dissipation factor of the insulation system capacitances
• Measurement of no-load loss and current
• No-load current harmonics measurement
• Measurement of short-circuit impedance and load loss
• Lightning impulse test
• Applied voltage test
• Induced voltage withstand test
• Induced voltage test with partial discharge (PD) measurement
• Determination of sound levels
• Temperature rise test
• Measurement of frequency response
• Auxiliary wiring insulation test
• Verification of the ratio and polarity of built-in current transformers
• Leak testing with pressure for liquid-immersed transformers
• Inspection and function test of the control circuit

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