Question $2$

$5$ pts

We have a $21$ relay installed in substation a looking over Line A$-$B$,$ as well as Line B$-$C and Line C$-$D as backup protection.

Line A$-$B length is $44$ km $.$

Line B$-$C length is $107$ km $.$

Line C$-$D length is $56$ km $.$

ZLine $=0\mathrm{.}033$ per km$.$

In the $21$ relay we need to program the impedance for the Zone $3$ reach. From the given information above, calculate the primary impedance that the Zone $3$ will reach to$.$

Hint: Primary impedance is the actual impedance of the line, so you do not have to take into account the CT and VT at this point.

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