Patent ID: 11948705
Assignee: NEXANS
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An insulated electrically conductive element limiting the occurrence of partial discharges, comprising:
an elongate electrically conductive element surrounded by a tri-layer insulation system comprising
at least one electrically insulating layer surrounding the elongate electrically conductive element,
at least a first semiconductor layer of a thickness e1 surrounding said electrically insulating layer, and
a third layer, said third layer being a second semiconductor layer of a thickness e2 surrounding the elongate electrically conductive element, and being placed between the elongate electrically conductive element and the electrically insulating layer, the first semiconductor layer, the electrically insulating layer and the second semiconductor layer constituting said tri-layer insulation system,
wherein said electrically insulating layer has a thickness the value of said thickness ei being determined according to the operating voltage U of the insulated electrically conductive element, the value of the electric field emax, and an inner diameter d1 of the electrically insulating layer,
wherein the thickness ei of the insulating layer is determined according to a ratio of the operating voltage U to the diameter d1, such that the thickness ei simultaneously satisfies the following relationship:

  ei
  ≥
  
    
      
        d
        1
      
      2
    
    [
    
      
        exp
        (
        
          U
          
            
              E
              max
            
            ×
            
              
                d
                1
              
              2
            
          
        
        )
      
      -
      1
    
    ]
  

and

the thickness el≥e1+e2.