If you close both isolators bus bars will get energized from two transformers. Same time if you close the bus coupler there will be a clash of two power source.
@@pazhmalai It will be then Parallel operation of transformers: The line voltage ratio of the transformers must be same. The transformers should have equal per unit leakage impedance. (You may read per unit system) The ratio of equivalent leakage reactance to equivalent resistance should be same for all the transformers. The transformers should have the same polarity. The above four conditions are also applicable for parallel operation of single phase transformers. Apart from the above four condition, there exists two more conditions which should be fulfilled for parallel operation of three phase transformers: The relative phase displacement between the secondary line voltages of all transformers should be zero. This means that transformers to be connected in parallel must belong to same Group number like Yy0 and Dd0 belong to same group number viz. Group 1. The phase sequence of secondary line voltages of all the transformers should be same.
Practical video good sir
Super Sir 👌
Nice explain
Why did u told like both isolator and Bus coupler should not on condition can u pls explain sir?
If you close both isolators bus bars will get energized from two transformers. Same time if you close the bus coupler there will be a clash of two power source.
@@electricalvathiyar1753 we can couple without clash if both Transformers are same vector group ... am I correct?
@@pazhmalai
It will be then Parallel operation of transformers:
The line voltage ratio of the transformers must be same.
The transformers should have equal per unit leakage impedance. (You may read per unit system)
The ratio of equivalent leakage reactance to equivalent resistance should be same for all the transformers.
The transformers should have the same polarity.
The above four conditions are also applicable for parallel operation of single phase transformers.
Apart from the above four condition, there exists two more conditions which should be fulfilled for parallel operation of three phase transformers:
The relative phase displacement between the secondary line voltages of all transformers should be zero. This means that transformers to be connected in parallel must belong to same Group number like Yy0 and Dd0 belong to same group number viz. Group 1.
The phase sequence of secondary line voltages of all the transformers should be same.
@@electricalvathiyar1753 ok sit tnq
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