Title :
Thermoelectric ageing of cable grade XLPE in dry conditions
Author :
Griffiths, C.L. ; Betteridge, S. ; Hampton, R.N.
Author_Institution :
BICC Cables Ltd., Wrexham, UK
Abstract :
In the literature there are many papers that allude to the endurance of dielectric materials subjected to electrical stress. Generally it is noted that the endurance performance is reduced by stressing in moist conditions. However, it is important to realise that moisture barriers are often incorporated in cable designs so that the dielectric actually operates in a dry environment. In this paper we present the results on a series of dry thermoelectric ageing experiments. There is clear evidence of curvature associated with the endurance data. We have subsequently fitted our data to three models, the Thermodynamic Ageing model, the Space Charge Life model and the Electrokinetic Ageing model. All models purport to being physically based. The preferred model and the most satisfactory fits are achieved with the Electrokinetic Ageing model. This model predicts threshold ageing fields in excess of 21 kV/mm. The relative merits of each model are discussed
Keywords :
XLPE insulation; ageing; power cable insulation; XLPE cable insulation; dielectric material; dry environment; electrical stress; electrokinetic ageing model; endurance; space charge life model; thermodynamic ageing model; thermoelectric ageing; Aging; Cables; Dielectrics; Electrokinetics; Moisture; Polymers; Space charge; Stress; Thermodynamics; Thermoelectricity;
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1998. ICSD '98. Proceedings of the 1998 IEEE 6th International Conference on
Conference_Location :
Vasteras
Print_ISBN :
0-7803-4237-2
DOI :
10.1109/ICSD.1998.709279