Two synchronous machines are connected through three$-$phase transformers to the

transmission line. The ratings and reactances of the machines and transformers are:

Machines $1$ and $2$: $100$ MVA, $20$ kV$,\%2021$ XX $,\%60$X $,\%3$nX $.$

Transformers T$1$ and T$2$: $100$ MVA, Y$345/20$ kV$,$ X $=6\%$