MGVCL Exam Paper (30-07-2021 Shift 3)
Consider the following statements associated with Buchholz’s relays.
Statement 1: Buchholz's relay is used for protection of a transformer against incipient faults.
Statement 2: Buchholz's relay can be installed on oil cooled transformers.

Both Statement 1 and Statement 2 are FALSE
Both Statement 1 and Statement 2 are TRUE
Statement 1 is FALSE and Statement 2 is TRUE
Statement 1 is TRUE and Statement 2 is FALSE

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MGVCL Exam Paper (30-07-2021 Shift 3)
Medium voltage covered conductors (MVCC) are produced in voltage rating

beyond 200 kV
between 6.6 kV to 33 kV
between 132 kV to 200 kV
less than 3.3 kV

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MGVCL Exam Paper (30-07-2021 Shift 3)
The DC offset in fault current causes conventional over-current (OC) relays to :

reach remains unaffected due to DC offset
sometimes under-reach and sometimes over-reach
over-reach
under-reach

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