Electrical aging of polymer insulated power cables has been an important subject of investigation in the last several decades. Cable insulation is placed under heavy electrical stress due to overvoltages occurring during switching operations taking place in the power system. Transients overriding the normal ac operation voltage are some of the most hazardous conditions for cable insulation life. Although a good understanding of aging mechanisms under single stress has been achieved, more research work is needed to fully grasp the phenomena taking place under multi-stress conditions. In this study, the electrical aging of 15 kV Ethylene Propylene Rubber (EPR) power cables was undertaken by ac voltage with switching impulses superimposed in wet condition. The experiments aimed at providing a better understanding of the electrical aging phenomenon of EPR cable insulation in wet condition. It also helped to assess the reliability of EPR cables used under such circumstances.

Disposal of waste glass derived from bundling glass, beverage bottles, and so forth is one of the significant issues in the environment. This challenge keeps on expanding with increment the measure of waste glass and reduction the limit of landfill space. Hence, studies have been carried out to locate the handy approaches to reuse waste glass in building material, for example, cement, mortar, and concrete. In this study impact of waste glass powder (WGP) as cement substitution material on the green and mechanical properties of concrete were explored. The properties of concrete researched incorporate, Density, workability, strength activity index and compressive strength. Results from the investigation demonstrate that utilization of 20% WGP in concrete cube substitute to cement increase strength around to 12.5%. Additionally, usage of WGP up to 20% improves the properties of concrete. However, the workability of concrete reduced on the substitution of WGP increases because of the fine surface area of waste glass powder.

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