Answer / k.prakashchandra

LAVT is abbreviation for lightning arrester and voltage
transformer (PT)which can be used for measurement ,synch and
protection.

Answer / sudarshan

excitation transformer is alternate to pmg in case of generator excitation,its rating is same as excitation required by generator.
in case of failure of pmg generator main main exciter can be excited through excitation transformer.

excitation trans----.
......main exciter.....rotor
pmg----------- .

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