Double line to ground fault

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Graffeo Ex 53:

Screen Shot 2019-02-20 at 10.35.17 PM.png

In this example, for Double line to ground fault current only Ib is considered here which is incorrect.

I think the fault current shall be "Ib+Ic" or "3 x Ia0" which will lead to the answer "j10.71".

Please correct me if i am wrong.

 
I believe you are right, my notes seem to agree with you. I couldn't find that problem in graffeo but i did find the below one. This looks correct.

image.png

 
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