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If a three-phase load is connected to a three-phase network, there are two basic possible configurations. One is `star connection' (symbol Y) and the other is `delta connection' (symbol Δ).
In a three-phase star connection, the line voltage is always root 3 times the phase-to-neutral voltage.
in this video we have practically proved the relationship between Line voltage & phase voltage of Star connections.
Application of star connection: Alternators and secondary of distribution transformers, have their three, single-phase coils interconnected in star.
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