SSE JE Electrical Engineering 24 March 2021 Shift 2 Paper

Question : 134 of 200

Marks: +1, -0

When a V-V system is converted into a Δ-Δ system, the capacity of the system increases by ______.

Solution:

The capacity of the transformer is measured in

\VA =√{3} \V _{ \L } \I _{ \L }

For closed delta, transformer output

\VA =3 \V _{ \L } \I _{ \ph }

For open delta, transformer output

\VA=√{3} \V_{\L} \I_{ \ph }

\%

increase in capacity

={(\VA )_{\Δ-\Δ}-( \VA )_{ \V - \V }}/{( \VA )_{ \V - \V }} ×100

={3-√{3}}/{√{3}} ×100

=73.2 \%

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