英语翻译In many areas,"delta" three phase service is common.Delta service has no distributed neutral wire and is therefore less expensive.The three coils in the generator rotor are in series,in a loop,with the connections made at the three joints

英语翻译In many areas,"delta" three phase service is common.Delta service has no distributed neutral wire and is therefore less expensive.The three coils in the generator rotor are in series,in a loop,with the connections made at the three joints
英语翻译
In many areas,"delta" three phase service is common.Delta service has no distributed neutral wire and is therefore less expensive.The three coils in the generator rotor are in series,in a loop,with the connections made at the three joints between the coils.
Many areas in the world use single phase 220 V or 230 V residential and light industrial service.In this system,a high voltage distribution network supplies a few substations per city,and the 230V power from each substation is directly distributed.A hot wire and neutral are connected to the building from one phase of three phase service.
Ground is provided as a low resistance earth ground,sometimes attached to a synthetic ground made by a transformer in a substation.High frequency noise (like that made by arc furnaces) can sometimes cause transients on a synthetic ground.
In North America and Latin America,three phase service is often a Y (wye) in which the neutral is directly connected to the center of the generator rotor.Wye service resists transients better than delta,since the distributed neutral provides a low-resistance metallic return to the generator.Wye service is recognizable when a grid has four wires,one of which is lightly insulated.

英语翻译In many areas,"delta" three phase service is common.Delta service has no distributed neutral wire and is therefore less expensive.The three coils in the generator rotor are in series,in a loop,with the connections made at the three joints
很多地区,“三角接线（delta）”三项供电是共同的.三角供电没有配电中性线,因此比较便宜.靠线圈之间三个节点维系的连接,发电机转子中的三个线圈是串联的,成回线.
世界上许多地区使用单项220 V 或 230 V住宅和轻工业供电.在该系统中,高电压供电网在每个城市配备几个供电站.输往每个变电站的230 V电力是直接配电的.带电电线和中性线从三项中的单项供电连接到建筑物.
接地是作为低电阻地线配置的,有时候在变电站附设一个用变压器制成的人造接地.高频噪声（像电弧炉发出的声音）有时候会在人造接地上引起瞬变现象.
在北美和拉丁美洲,三相供电总是 Y型（星形接线）,中性线在Y接线中直接连接到发动机转子的中心.星形接线供电比三角接线更经得住瞬变现象,因为配电中性线向发动机配置低电阻金属回线.栅格具有四根线的时候,星形接线供电很容易辨认,其中一根轻度绝缘.