Question

Among the following, which is not seen on the name plate of a Power transformer?
1. Vector group
2. Duty
3. Insulation class
4. Frame size

Answer 1

Correct Answer - Option 4 : Frame size

Transformer Nameplate:

Following are he minimum information and Data which to be shown on a transformer nameplate.

• Name of manufacturer
• Serial number
• Year of manufacture
• Number of phases
• kVA or MVA rating
• Duty
• Frequency
• Voltage ratings.
• Tap voltages.
• Connection diagram.
• Insulation class (Cooling class) - The insulation class indicates the type of transformer insulation.
• Rated temperature in °C
• Polarity (for Single Phase Transformers)
• Phasor or vector diagram (For Poly-phase or Three Phase Transformers)
• Percentage Impedance.
• Approximate mass or weight of the transformer
• Type of insulating liquid.
• Conductor material of each winding.
• Oil volume (of each transformer Container/Compartment)
• Instruction for Installation and Operation