A 220/66 kV sub station has 50MVA 220/66 kV incoming Transformer feeding to 66 kV bus which has 1 No 5MVA Tx 66/0.440 kV and 1 No.10MVA Tx 66/11 kV and the total existing load is about 10 MW . I want to connect 1 No. 40MVA 66/33kV Tx on this 66 kV bus. Whether I switching on this new 40 MVA Tx will be safe and will not affect the existing Txs by insrush current of 40 MVA Tx.
Need comments. In my opinion it is not safe because of 40 MVA inrush current on only one 50 MVA main incoming Tx supplying the 66kV bus.