I did not get what you meant.

Firstly 440V is not a transmission voltage level. Secondly, are you interested in the effect on the transmission line and associated protection equipment and transformers or the equipment supplied finally at load end? Thirdly, do you mean unidirectional pulsating DC train of pulses at some fixed frequency ? Finally, why this strange idea?

The pulsating DC - unidirectional DC pulses - will be at the end DC voltage. Transformers will work, but, their cores will magnetically saturate, thus they will not continue working properly. On the other hand, harmonics are there, in the DC pulsated voltage, that have many negative effects.

But, what is the benefit of pulsated DC in transmission or distribution?

Salah, thanks for adding your comments to mine. In addition to what you have said, pulsating unidirectional pulses, when sent through a transmission line (L-C network), will be reproduced at the receiving end with a superimposed ringing at the leading edge, such that the peak voltage can be several times higher than the original flat top ! That may be enough to damage receiving end equipment existing insulation.

Great thanks Prof. Biswas for the knowledge you share .. Your interaction and support by sharing your knowledge with the following generations is highly appreciated.

I can see only disadvantages of such strange concept and no single advatage as compare to the conventional AC or Dc transmission system

well if your system operates at DC then i don't think so it make much of difference, if your rectifying circuit can handle it