Power distribution in remote areas with low density load is usually performed with Single Wire Earth Return (SWER) systems. These systems have been shown to be insufficient to meet not only the growing demand but also three-phase loads. The Three-Phase-Two-Wire (TPTW) system is a non-conventional low-cost alternative system for repowering the SWER, as both of them use the ground as conductor. The TPTW system is inherently unbalanced and may have greater voltage drops than a conventional three-phase system. This paper proposes a method to decrease voltage unbalance by choosing the correct spacing between of TPTW System overhead conductors. Additionally, the method eliminates the need for reactive series compensation and reduces working time and installation costs. TPTW System performance was evaluated for different conditions and designs such as cable type, spacing, length and passive compensation. The results show that optimal spacing can be reached among cables, and viable supply can be offered for distant loads with relatively low voltage unbalance.

中文翻译：

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三相两线制农村配电网：设计特性对电压不平衡的影响

具有低密度负载的偏远地区的配电通常使用单线接地回路 (SWER) 系统来执行。事实证明，这些系统不仅无法满足不断增长的需求，也无法满足三相负载。三相双线 (TPTW) 系统是一种非常规的低成本替代系统，用于为 SWER 重新供电，因为它们都使用地面作为导体。TPTW 系统本质上是不平衡的，可能比传统的三相系统具有更大的电压降。本文提出了一种通过选择正确的 TPTW 系统架空导线间距来减少电压不平衡的方法。此外，该方法消除了对无功串联补偿的需要并减少了工作时间和安装成本。针对不同条件和设计（例如电缆类型、间距、长度和无源补偿）评估了 TPTW 系统性能。结果表明，电缆之间可以达到最佳间距，并且可以为电压不平衡度相对较低的远距离负载提供可行的供电。