First
zone distance relay protects a transmission line section upto about
50%
of its full length
25%
of its full length
Its
full length
80% of its full length
80% of its full length
Zone-1
is meant for protection of the primary line. Typically, it is set to cover 80%
of the line length.
Zone-2
provides fastest protection because there is no relational time delay associated
with it. Operating e of Zone-1 can be of the order of 1 cycle.
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