I think the first link when searching for "bipolar homopolar hvdc" on google pretty much explains it:
http://www.scribd.com/doc/7360181/HVDC-Transmission-Lines <<A Homo polar arrangement consist of two conductors of same polarity on the same tower. In fact, it is a mono polar system having two conducters/pole. The ground is used as a return path. Homo polar system is used for the overhead d.c. line feeding in to the d.c. cable. The bi polar arrangement uses two poles, one positive pole and other negative pole at each conversion substation, the mid-points points of converter are earthed, the current carried by the ground, is However less if one of the poles is out of service, the bi polar arrangement can be used as a mono polar arrangement. Although it is used at a reduced rating. Bi polar arrangement is universally used for bulk power HVDC overhead transmission linear and also for overhead lines for interconnection. >> I hope this can help you in your 20-day search for answers :-) From: bounce-6249237-9864...@list.cornell.edu [mailto:bounce-6249237-9864...@list.cornell.edu] On Behalf Of Ummaiah B Sent: 3. september 2010 07:25 To: MATPOWER discussion forum Subject: Hi.... Dear all, Hi, can someone tell the difference between Bipolar HVDC transmission and Homopolar HVDC transmission system. I have been searching for this answer from last 20 days.. I am sorry if this question does not related to our MATPOWER discussion.. Thanks in advance, B. Ummaiah
