690V 50Hz

[JJAC]

I am looking at a project in Mongolia where the voltages appear to go from 230V 1 ph, 380 3 ph then to 690V 3 ph with distribution at 10.5kV Of interest 690 V for >200 kW.
690 V appears to be 400xroot3 indicating a 400V motor winding in star rather than delta.
Is 690 V a common Non US voltage? IEC perhaps?
International drive manufacturers appear to list it as do foreign motor manufacturers.
Any comments

 

[jraef]

Common in some applications, such as undergound mining where distribution distances can be great. Higher volage = lower current = more distance out of a given wire size.

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[Skogsgurra]

Many industrial installations in Europe have 690 V isolated (IT) with no neutral. It is the standard used for most new paper mills where many drives are in the 1+ MW range.

The former 500 V system is not used much any more. The 690 V systems have been around for more then ten years and seem to replace the earlier 500 V IT systems.

Gunnar Englund

http://www.gke.org

 

[taylorg]

Many wind turbines generate at 690V.