ARTICLE INFO ABSTRACT ARTICLE HISTORY: Received 23 October 2013 Revised 11 December 2013 Accepted 20 December 2013 Pulse-width modulated (PWM) adjustable frequency drives (AFDs) are extensively used in industries for control of induction motors. It has led to significant advantages in terms of the performance, size, and efficiency but the output voltage waveform no longer remains sinusoidal. He...

The stability of transmission lines relies on the health of the insulators, such as glass string insulators, which may occasionally flashover during an overvoltage. The likelihood of flashover increases notably when the glass insulator is wrapped by a wet contaminant layer. In this paper a study of the surface thermal profile of glass disc insulators insulation had been carried out for both cle...

Electrical insulation materials are advancing rapidly due to several advantages including light weight, better performance in polluted environment and reduced installation cost. In polymeric micro-composites, enhancing one property of the insulator may affect adversely on the other desired properties. This problem can be addressed practically with the invention of nanocomposites. This article p...

Aging mechanisms of two polymeric insulation materials that are used widely in nuclear power plant low-voltage cables; cross-linked polyethylene (XLPE) and ethylene propylene rubber/ethylene propylene diene terpolymer (EPR/EPDM), are reviewed. A summary of various nondestructive methods suitable for evaluation of cable insulation is given. A capacitive sensor capable of making local nondestruct...

Polymeric insulators need proper management and maintenance. Without proper management, the electric devices can be affected by factors such as leakages in the electricity system. In outdoor insulation, the environment subjects the material to a variety of stresses simultaneously that can lead to rapid degradation and loss of the insulation properties. Contamination of the surface of the insula...

Abstract The aim of this work is to highlight the evolution physico-chemical properties peroxide crosslinked polyethylene (XLPE) insulation material exposed electrical aging. Specific analysis and characterization studies were carried out determine effect aging on different samples at micro macro levels. Based analytical investigations, it was shown that yielded significant changes in chemical ...

Analyzing the concentration of low molecular acids dissolved in oil is vital in the oil-paper insulation aging diagnostic procedure of power transformers. The existing methods cannot distinguish between different acid types and their strengths. In this study, an improved solution Raman detection platform is fabricated. The direct measurement of dissolved acetic acid, a kind of low molecular aci...