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 .