Title :
Diagnostics of medium voltage PVC cables by dissipation factor measurement at very low frequency
Author :
Lelak, Jaroslav ; Durman, Vladimir ; Packa, Juraj ; Olach, Ondrej
Author_Institution :
Dept. of Electrotechnol., Slovak Univ. of Technol., Bratislava, Slovakia
Abstract :
This paper reports on the phenomena related to degradation of medium and high voltage PVC cables due to ageing. It was shown, that at the highest operating temperature, values of the cable dissipation factor (tan δ) significantly increased with ageing. In practice, the cable insulation is subjected to a positive feedback, leading to rise of temperature breakdown risk. In this paper a method is proposed for indication of insulation degradation at room temperature. It is based on measurement of tan δ in the frequency range of 0.02 to 50 Hz. The changes of tan δ at temperatures near the highest operating temperature can be indicated by measurements at room temperature.
Keywords :
ageing; dielectric loss measurement; insulation testing; organic insulating materials; polymers; power cable insulation; power cable testing; 0.02 to 50 Hz; ageing; breakdown risk; dissipation factor measurement; highest operating temperature; insulation degradation; medium voltage PVC cables; positive feedback; room temperature; tan δ measurement; Aging; Cable insulation; Degradation; Dielectrics and electrical insulation; Electrical resistance measurement; Frequency measurement; Manufacturing; Medium voltage; Temperature distribution; Temperature measurement;
Conference_Titel :
Electrical Insulation, 2002. Conference Record of the 2002 IEEE International Symposium on
Print_ISBN :
0-7803-7337-5
DOI :
10.1109/ELINSL.2002.995885
