Discussion
Which of the following is NOT an input used in MHO relay?
Answer: D
A mho relay is a distance relay with a circular characteristic that passes through the origin, and it compares an operating quantity with a restraining quantity, with a polarising input that gives it direction. So its inputs are the operating input, the restraining input and the polarising input. Galvanic input is not one of the inputs of a mho relay (galvanic isolation is a property of circuits and not a relay input). The answer is option D.
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