Which of the following statements is/are correct regarding the Bipolar HVDC system?
(i) The two six-pulse converters are fed from delta-delta and delta-star transformers.
(ii) The two secondaries cause displacement of 120°.
(iii) The two-six pulse converters are connected in series on the AC side.
(iv) The two-six pulse converters are connected in parallel on the DC side.
1
Both (i), (ii) and (iv)
2
Both (i) and (ii)
3
Only (i)
4
Only (iv)