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Thermal and Electrical Stresses Effect on the XLPE-EPR DC Cable Joints Insulations

This paper deals with the thermal, electrical and combined thermo-electrical ageing of some XLPE and EPR flat samples. The samples were aged for different ageing times and electric fields. Before and after ageing, the electrical properties (e.g. electrical conductivity and permittivity) were measured. The physical modifications of the specimens were analyzed, also.
Combined stresses (electrical and thermal) lead to significant variations for the specimens properties, compared to the variations caused by uni-factor stresses. For the electrical and thermo-electrical stresses, color changes of the specimens and thermal breakdown occur.

Author(s):

Cristina STANCU    
University Politehnica of Bucharest
Romania

Petru NOTINGHER    
University Politehnica of Bucharest
Romania

Lucian TARANU    
University Politehnica of Bucharest
Romania

Adelina CERNAT    
University Politehnica of Bucharest
Romania

Alexandra CONSTANTIN    
University Politehnica of Bucharest
Romania