MGVCL Exam Paper (30-07-2021 Shift 1)
For protection of inter-turn fault in transformer, the relays preferred are

Buchholz's relay and differential relay
Overcurrent relay and Buchholz's relay
Buchholz's relay, overcurrent relay and differential relay
Overcurrent relay and differential relay

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MGVCL Exam Paper (30-07-2021 Shift 1)
The necessary equation to be solved during the load flow analysis using Fast-Decoupled methid is given below:
where B' and B'' are formed using the imaginary part of the bus admittance matrix Ybus, n is the total number of buses in the system, m is the number of voltage regulated buses. The size of matrix B' is
∆P/|Vi|= -B' ∆δ
∆Q/|Vi| = -B'' ∆|Vi|

(n-m) x (n-m)
(n-m-1) x (n-m-1)
(n-1) x (n-1)
(m-1) x (m-1)

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MGVCL Exam Paper (30-07-2021 Shift 1)
The normal percentage bias setting of differential relay used for transformer protection will be

above 75%
between 10% and 50%
between 50% and 75%
below 10%

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