Reactance relays are employed for phase fault in
Long line
Medium line
Short line
Any of these
Short line
For
very short line sections the reactance type relay is preferred for the reason
that more of the line can be protected at high speed. This is because the
reactance relay is practically unaffected by arc resistance, which may be large
compared with the line impedance.
Hence, the correct option is (C).
&Key Points:-
Impedance
relay and mho relay is used for medium transmission lines and long transmission
lines respectively.
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