engineering recuitment HPCL Junior Executive 2025 Mock Test Electrical Machines Transformer Parallel Operation of Three Phase Transformers
Which of the following condition is essential for parallel operation of two 3-ϕ transformer?
1
Same voltage ratio and same voltage referring to the primary ratio and same voltage the transformer to be connected in parallel.
2
The phase displacement between primary and secondary must be the same for all transformers connected in parallel.
3
The phase sequence must be the same.
4
All of the above