Which of the following is the preferred protection for ground fault?
Overcurrent
relay
Plain
impedance relay
Reactance
relay
Directional
relay
Reactance
relay
Reactance
relay is used for ground fault. It is also used for short transmission lines.
(I)
Impedance relay is used for medium transmission line
(II)
The mho relay is used for long transmission lines.
Hence,
the correct option is (C).
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