DocumentCode :
3487783
Title :
Comparative study of space charge in the polymeric insulation of power cables using PEA, isothermal and non-isothermal currents measurements
Author :
Lança, M. Carmo ; Fu, M. ; Neagu, E. ; Dissado, L.A. ; Marat-Mendes, J. ; Tzimas, A. ; Zadeh, S.
Author_Institution :
Departamento de Ciencia dos Materiais, Universidade Nova de Lisboa, Caparica, Portugal
fYear :
2005
fDate :
11-14 Sept. 2005
Firstpage :
284
Lastpage :
287
Abstract :
An understanding of space charge build-up in the polymeric insulation of power cables is important in determining how aging occurs and progresses and, also in predicting cable lifetime. In this investigation electric-field induced space charge in peelings from XLPE (cross-linked polyethylene) cables was measured using two different methods: the pulsed electro-acoustic technique (PEA) and the combined procedure of isothermal and non-isothermal charging/discharging currents (FTSDC). These two methods allow the study of space charge in highly insulating materials. Also, since electric fields of different orders of magnitude are applied to the sample in the two methods, it is possible to analyze different characteristics of the space charge traps. Prior to the measurements the samples were subjected to conditioning to remove volatiles. Cable peelings from various brands aged under different conditions (including field aged and thermally aged samples) were studied as received from the manufacturers. Some of the samples have undergone further ageing in AC electric field (50 Hz) for 1000 h to see the influence of further ageing on space charge build-up. The results for the different types of samples are compared in an attempt to correlate different ageing parameters.
Keywords :
ageing; polymer insulators; power cable insulation; pulsed electroacoustic methods; space charge; 1000 h; 50 Hz; AC electric field; PEA; cable lifetime; cable peeling; cross-linked polyethylene cables; electric-field induced space charge; isothermal charging currents; isothermal discharging currents; nonisothermal charging currents; nonisothermal discharging currents; polymeric insulation; power cables; pulsed electro-acoustic technique; space charge traps; Aging; Cable insulation; Current measurement; Isothermal processes; Plastic insulation; Polyethylene; Polymers; Power cables; Pulse measurements; Space charge;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrets, 2005. ISE-12. 2005 12th International Symposium on
Print_ISBN :
0-7803-9116-0
Type :
conf
DOI :
10.1109/ISE.2005.1612377
Filename :
1612377
Link To Document :
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