What is the delta connection rule?

3 phase system can be connected in two different styles I.e. star or delta. In star connection, line to line current is equal to line to neutral current. But, line to line voltage is root 3 times the line to neutral voltage. In delta connection, voltage across each element is equal to line voltage.



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The main disadvantage of the delta-delta transformer is that there is no star-point or neutral terminal available. Therefore, the delta-delta connected transformer is used when neither primary nor secondary requires neutral terminal and the voltages are low and moderate.

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