A $50Hz,3$ phase generator with rated capacity $200$ MVA $,$ and rated voltage $10$ kV $($line to line$),$ is operated with an internal voltage of $1\mathrm{.}1$ pu$.$ Assume a solid $3$ phase fault occurs on the generator's terminal and that the circuit breaker operates after five cycles. $($base values $200$MVA and rated voltage $V=10KV)$

Assume that:

$x^{\text{'}\text{'}}=0\mathrm{.}15pu$

$x^{\text{'}}=0\mathrm{.}24pu$

$xd=1\mathrm{.}1pu$

$T_d^{\text{'}}=0\mathrm{.}035s$

$T_d^{-}=2s$

$T_A=0\mathrm{.}2s$

The base current of generator Ibase is

A $($No digits after decimal point$)$

At starting of fault, at time $t=0,$ Find

a$)$ The symmetrical fault current at $t=0$ is acc$(0)=$

A $($No digits after decimal point$)$

b$)$ The maximum DC offset current $t=0$Idc$(0)=$

c$)$ The RMS value of fault current at $t=0$ is$,I_{rms}(0)=$

A $($No digits after decimal point$)$

After five cycle, Find

a$)$ find the time of the five cycles $t=,s($put the exact value$)$

b$)$ The symmetrical fault current at time $t,$ is $ac(t)=$

A $($No digits after decimal point$)$

$q,$