GETCO Exam Paper (30-11-2008)
Directional over current relays have two exciting coils connected across _____ secondary's of two _____ phases

T., different
T. & P.T., different
P.T., different
T. & P.T., same

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GETCO Exam Paper (30-11-2008)
A buchholz will operate in a transformer whenever there is

saturation of magnetic circuit
large internal fault
any of the above
over load

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