问题描述：
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.
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.
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