Feasibility and impact of using six-phase line in a specific distribution and sub-transmission system

Power loss issue is one of the most significant issues encountered in electrical industry and it is essential to note. System design is essentially to ensure that the increased electricity demand could be meeting by power system development, so that it becomes technically a suitable and economical system. Distribution system has a particular importance in electrification due to: 1) near perfectly to the consumers 2) high investment cost. On the other hand, about 67% of power grid loss is related to the distribution system. Beside, conversion of 3-Phase Double-Circuit (3PDC) to 6-Phase Single-Circuit (6PSC) line is known as a well method to increase the power transfer capability of existing ROWs. Thus, in this paper, an investigation of conversion of existing 3-Phase Single-Circuit (3PSC) lines to the 3PDC to 6PSC lines is studied and compared. It is found that with the same transmitted power in the 3PDC and 6PSC states, using the 6PSC line in suitable places of sub-transmission and distribution systems will dramatically result in decreased loss and improved voltage regulation. In all the cases, test power system is assumed as a balanced system.