Protection Engineering Basics and Schemes Protection Engineering | Page 100

Let we discuss A-G fault, In this condition,

I b and I c both equal to zero, V a = I a Z f I a = I a1 + I a2 + I a0 … … …( SQ1) We need to find values of sequence currents, as I b and I c Is zero then,

I a0 = 1 3( I a + I b + I c)

I a0 = 1 3 I a

I a1 = 1 3( I a)

I a2 = 1 3( I a)

I a0 = I a1 = I a2 = 1 3 I a pg. 100