When a line-to-ground fault occurs, the current in the

When a line-to-ground fault occurs, the current in the phase is 100 A. The zero sequence current in this case will be _______ A

For a L – G fault,
I_a0 = I_a1 = I_a2 and I_a = 3 I_a1

∴ I_a0 =	I_a	=	100	= 33.3 A 212
	3		3

I_a =(400 + j 100), I_b = (75 – j 600), I_c = (– 300 + j 500)
I_a2 = 1/3 (I_a + α² I_b + αI_c)

=	1	[(400 + j100) + (75 - j 600) \|240° + (-300 + j 500)\|120°]
	3

=	1	[400 + j100 + (75 - j 600) + (-300 + j 500)(-0.5 + j0.86)]
	3

=	1	[(400 + j100) + -553.5 + j235.5 - 280 - j 508]
	3

=	1	[ - 415.5 - j 172.5]
	3

= 149.96 |202.5°