Coordinate the relays for maximum fault currents

Hey guys,

Going though a problem in my book, and I'm stuck on the max fault level used in the solution.


I can get the full load currents at each bus:
I,fl3=100.41A
I,fl2=167.35A
I.fl1=351.43A
Current Tap Settings
Is,3=2.51A--->use 3A
Is,2=4.18A--->use 5A
Is,1=4.39A--->use 5A

This is where I'm confused,
TDS=>ratio3 = If/[I,pickup]
In the solutions, the Max fault current (If) at B3 is 2000A...
Shouldn't it be 1000A?

Thanks guys