=====标称电压=====
根据GB/156标准
  *低压电压范围交流100-1000V
 
  *国内常用220/380V(国外常用230/400V)
  
  *中压10kV,20kV,35kV

  *高压/超高压110kV,220kV,330kV/500kV
  
  *线电压和相电压U/V= 380V/220V =1.732
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