关于单相三线供电制式的分析

居民用电是单相负荷。单相负荷供电有种制式：单相二线、单相三线和三相四线（Ｙ０）。我国目前采用三相四线制供电．这种制式可以向单相、三相和单、三相混合负载灵活供电，但对单相负荷来说，不如单相三线制经济、合理。本文对单相三线供电制式的经济、安全合理性做了简要分析．

Analysis on the Single-phase Tri-wire Power Supply System

The power for living is a single-phase. Thete are three systems for single load power supply,single-Phase two-wire,single-phase tri-wire and tri-Phase four-wire(YO). Nowadays,the tri-phase four-wire system is used in our country. This system can make power adaptable to the single-Phase load.tri-phase load and single-tri phase load,but to the single-Phase load,it is not as economical and rational as the single-phase tri-wire system. This paper gives a brief analysis on the economical and rational qualities of the singl-phase triwire system.