Four-phase overhead transmission lines have special advantages in high phase order transmission lines, because of the good symmetry and the simple structure of its lines and poles.
四相架空输电线路对称性好，线路及杆塔结构简单，在多相输电线路中具有独特的优势。
Because four-phase transmission system has the advantages of good symmetry and simple structure of its lines and poles, it has obvious superiority over other multi-phase power transmission system.
四相架空输电线路对称性好，线路及杆塔结构简单，在多相输电线路中具有独特的优势。
Because four-phase transmission system has the advantages of good symmetry and simple structure of its lines and poles, it has obvious superiority over other multi-phase power transmission system.
四相架空输电线路对称性好，线路及杆塔结构简单，在多相输电线路中具有独特的优势。
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