Question $2$: $($Part A $-15$ points; Part B $-5$ points$)$

A$.$ Figure $1$ shows the characteristics of fuse $($F$)$ and recloser $($R$).$ The sectionaliser $($S$)$ has a pickup value of $300$ A $.$

For the distribution network shown in Figure $2,$ discuss the sequence of operation of $R$ and $S$ under temporary fault with fault current $1000$ A and duration $5$ ms $.$

For the distribution network shown in Figure $3,$ discuss the sequence of operation of R and F under temporary fault with fault current $1000$ A and duration $500$ ms $.$

For the distribution network shown in Figure $3,$ discuss the sequence of operation of $R$ and $F$ under permanent fault with fault current $500$ A and duration $500$ ms $.$