Consider the distribution line system shown in Figure $1.$ The protection scheme used for protecting this system uses an SEL$-751$A Feeder Relay with the setting described as follows:

Programmed with C$1$ Characteristic Curve. Time dial $($TD$)$ of $1.$ Maximum $($all$)$ Phase TOC of $1$ Amp

Figure $1$: Distribution line supply system with SEL$-751$A Feeder Relay $751$A$11$D$1$D$0$X$76811610,$ and $2011$

$1\mathrm{.}1$ Calculate, the flow of current in the feeder when the load is operating at its maximum capacity.

$1\mathrm{.}2$ Determine in seconds how long the IED will take to send the trip signal to the circuit breaker when the current flow in the system is double the maximum rated current of the load.