Q$2($a$)$ A $3-$phase, $150$MVA,$13\mathrm{.}8kV,$ star$-$connected generator is protected by the current balancing protection system. The ratio of the current transformer is $\frac{1200}{5},$ the minimum operating current of the relay is $2\mathrm{.}5$ A $,$ the synchronous reactance is $2$ and the neutral point earthing resistance is $3.$ Calculate the percentage of each phase of the stator winding which is protected against earth faults when$-$the machine is operating at normal voltage, and suggest what can be done to the relay to increase the portion of protected winding