GATE Electrical Engineering (EE) 2019 Solved Paper

Question : 25 of 65

Marks: +1, -0

Five alternators each rated

5 {MVA}, 13.2 {kV}

with

25 \%

of reactance on its own base are connected in parallel to a busbar. The short-circuit level in MVA at the busbar is _____________.

Solution:

Five alternatnators are in parallel

Thevenin's equivalent reactance,

X_{\;\text "th "\;}=\;{0.25}/{5} {pu}

{f}

short circuit level at the bus bar,

{SCMVA}_{(3 . ϕ)}=\;{ {Base} {MVA}(3-φ)}/{ {X}_{ {tin}}( {pu})}=\;{5}/{(\;{0.25}/{5})}=\;{25}/{0.25}=100 {MVA}

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