Quantifying time-dependent structural and mechanical properties of UV-aged LDPE power cables insulations.

This paper reports effects of ultraviolet (UV) light radiation on the physicochemical, electrical and mechanical properties of low-density polyethylene (LDPE) cable insulating materials. Changes in structural and morphological properties of UV-aged samples were characterized by various analytical methods such as attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Additionally, elongation at break, tensile strength, dielectric strength, and optical properties were also evaluated.

Analysis of Gaseous By-Products of CFI and CFI-CO after High Voltage Arcing Using a GCMS.

Increasing demand for an alternative insulation medium to sulphur hexafluoride (SF) has led to the investigation of new environmentally friendly insulation gases which could be used in high voltage equipment on the electrical power network. One such alternative, which is currently being explored by researchers, is Trifluoroiodomethane (CFI) which could potentially be used in a gas mixture with carbon dioxide (CO) as an insulation medium. In this paper an analysis of gaseous by-products detected as a result of high voltage breakdown through pure CFI and a CFI-CO gas mixture across a sphere-sphere electrode arrangement is given.