Question
Download Solution PDFWhich of the following is a common internal fault in transformers?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe most common internal fault in transformers is winding inter-turn short circuits.
Winding inter-turn short circuits
An inter-turn short circuit in a transformer refers to a short between adjacent turns of a winding due to insulation failure. Unlike phase-to-phase or winding-to-core faults, these occur within the same winding, making them harder to detect early.
Causes of Inter-Turn Short Circuit in Transformers:
- Insulation degradation due to thermal aging
- Overvoltages / surges
- Mechanical vibrations or shocks during transport or operation
- Moisture ingress leading to partial discharge
- Manufacturing defects
- High inrush or fault currents causing turn displacement
Last updated on Jun 7, 2025
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