What are Transformers General Protections?

Over current, Transformer Differential, Phase Imbalance, loss of power, reverse power, Temperature of windings , power factor in Oil Transformers, Low oil,

General Protections are Buchholz  Relay,Over Current,Over/Under Voltage,Flux Leakage,Zone Fault,Phase to Phase Fault,Under Frequency,Differential Relay,Breaker Failure,Overexcitation,Earth Fault etc

Transformer main protection is buchhloz realy (mechanical protection). Over current differential protection is usually used as a backup for buchhloz relay. Other protections are Voltage controlledOver current protection Oil level indicator Winding temperature protection Under voltage protection etc