Protection Engineering Basics and Schemes Protection Engineering | Page 102

Also we knewV a = I a Z f and I a0 = I a1 = I a2 = 1

3( I a), so

( SQ2) now become,

I a Z f =( − 1 3) I a( Z a0 + Z a1 + Z a2) + V f

V f = I a( Z f + Z a0 + Z a1 + Z a2)

3

I a =

Since, I a0 = I a1 = I a2 =( 1

3) I a

Then,

I a0 = I a1 = I a2 =

V f( Z f + Z a0 + Z a1 + Z a2

) 3

V f( 3Z f + Z a0 + Z a1 + Z a2) pg. 102