What provisions should be complied with for the installation

The corresponding protective equipment should be installed for the short-circuit defects of the lead-out wire, bushing and the inside of the transformer, and should comply with the following provisions: 1)10MVA and above a single working transformer and 6.3MVA and above a side-by-side working transformer, should be installed with longitudinal differential protection. 6.3 MVA and below are also suitable for the installation of Longitudinal differential protection. 2) the transformer below 10MVA can be equipped with current quick break protection and over-current protection. 2MVA and above transformers should be installed with longitudinal differential protection when the current quick-break activation coefficient does not meet the requirement. 3) transformer with 0.4 mva and above, primary voltage 10 kv and below, winding triangle-star connection, can adopt two-phase three-relay type over-current protection. 4) the protective equipment specified in this article shall operate to disconnect the circuit breakers on each side of the transformer.