Electrical Knowledge by Sachin Sir
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The relay used for phase fault protection of short transmission lines is
A) Reactance relay B) Impedance relay C) Mho relay D) IDMT relay
For ground fault we prefer :
A) Plain impedance relay B) Directional relay C) Reactance relay D) Over current relay
Reactance relay is normally used for protection against
A) Earth fault only B) Phase fault only C) Both Earth and Phase faults D) None of the above
Earth fault relays are
A) Directional relays B) Non-Directional relays C) Short operate time relays D) None of these
Buchholz relay are used on
A) Air cooled transformers B) Instrument transformers C) Distribution transformers D) Oil immersed power transformers of rating above 500 kVA
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