What faults will appear in the operation of power transforme

For the following faults and abnormal operation methods of power transformer, the corresponding protective devices should be installed: 1) the short circuit between the windings and their leads and the single-phase-to-ground short circuit at the side of the direct ground at the neutral point; 2) the Short Circuit between the windings; 3) the over-current caused by the short circuit between external phases; 4) the over-current and over-voltage caused by the short circuit of the external ground in the direct ground power network at the neutral point; 5) the overload; 6) the oil level drop; 7) the transformer temperature increase or the tank pressure increase or the cooling system failure