138 5.7 Consider the multiterminal line in the system shown in Figure 5.27. Each of the buses C, D, G, H, and J has a source of power behind it. For a three-phase fault on bus B, the contributions from each of the sources are as follows: 6+/60 + Source Current, I J 600 C 200 D 300 G 800 H 400 1+/10 2+/15 6+/60 G B 6+/60 4+140 www D 0+/10 TH 3+/20 D с Figure 5.27 System diagram for Problem 5.7 You may assume that the fault current contributions from each of these sources remain unchanged as the fault is moved around throughout the system shown. Determine the Power System Relaying zones 1, 2, and 3 settings for the distance relays at buses A and B. Remember to take into account the effect of the infeed for determining the zones 2 and 3 settings, while no infeeds are to be considered for the zone 1 settings.