Condition for Parallel Operation of Transformer: ◾For parallel - TopicsExpress

Condition for Parallel Operation of Transformer: ◾For parallel connection of transformers, primary windings of the Transformers are connected to source bus-bars and secondary windings are connected to the load bus-bars. ◾Various conditions that must be fulfilled for the successful parallel operation of transformers: 1. Same voltage Ratio & Turns Ratio (both primary and secondary Voltage Rating is same). 2.Same Percentage Impedance and X/R ratio. 3.Identical Position of Tap changer. 4.Same KVA ratings. 5.Same Phase angle shift (vector group are same). 6.Same Frequency rating. 7.Same Polarity. 8.Same Phase sequence. ◾Some of these conditions are convenient and some are mandatory. ◾The convenient are: Same voltage Ratio & Turns Ratio, Same Percentage Impedance, Same KVA Rating, Same Position of Tap changer. ◾The mandatory conditions are: Same Phase Angle Shift, Same Polarity, Same Phase Sequence and Same Frequency. ◾When the convenient conditions are not met paralleled operation is possible but not optimal.

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