The main aim of this study is to investigate the ageing process of low voltage cables in smart grid. In addition the behavior of ageing phenomenon is also been investigated. The low voltage cable networks were developed decades ago and it is of utmost importance to make comprehensive study over the health of existing low voltage cable networks so as to avoid any unprecedented damage. Incessantly increasing energy demand and distributed generation makes it among top priorities to investigate the aging process of low voltage cables.
In the first part of this comprehensive study we made extensive literature review over previously done work and researches so as to get clear insights about the topic. Therefore, fundamental properties of the topic such as smart grid, low voltage distribution systems, cable structure etc. are investigated. Insulating materials that are used for low voltage distribution cables such as PVC, XLPE, EPR, OIP and their strong and weak points are examined. Thereafter, stressors were investigated (thermal stress, water ingress, mechanical stress, etc.) because of their direct influence on the ageing process of cable.
The second part of my work was mainly comprised of laboratory measurements. The effect of thermal stress over dielectrics was investigated as a part of research. To be able to determine these effects the measurements were done on PVC insulated (both cores and jacket) cable by measuring tanδ (dissipation factor), capacitance, return voltage of cable and hardness of insulations. In order to determine thermal effects on dielectric, the measurements were done in different temperature ranges i.e. at 110°C, 125°C and 140°C