Vague reliability analysis for fault diagnosis of cannula fault in power transformer

Abstract

Due to information transmission mistakes as well as arisen errors while processing data in surveying and monitoring state information of any system, uncertain and incomplete information may be produced. Based on these points, present paper extends our study for the development of a vague scheme for fault tree analysis of any general system. The functioning of the developed vague scheme is demonstrated for diagnosis of cannula fault in power transformers using vague fault tree analysis (VFTA) and beta distribution for failure possibility estimation. By using these techniques we have proposed herein, the extension of Pandey et al., in 2011 to define the continuous attribute values transformed into the vague numbers to give a realistic estimate of failure possibility of a basic event in VFTA. Further, it explains a new approach based on Euclidean distance between vague numbers, to rank the basic events in accordance with their Vague Importance Index (VII). 852 M. K. Sharma et al.

Hydrodynamic Radiating Fluid Flow Past an Infinite Vertical Porous Plate in Presence of Chemical Reaction and Induced Magnetic Field

“…Using the transformations (22) and with help of (21), (20), (19), (18), (16), (15) and (14) the non-dimensional forms of (6), (8), (10) and 12…”

“…Muthucumaraswamy and Valliammal [14] have presented the theoretical study of unsteady flow past an exponentially accelerated infinite isothermal vertical plate with variable mass diffusion in the presence of homogeneous chemical reaction of first order. Sharma et al [15] have investigated the influence of chemical reaction and radiation on an unsteady magnetohydrodynamic free convective flow and mass transfer through viscous incompressible fluid past a heated vertical porous plate immersed in porous medium in the presence of uniform transverse magnetic field, oscillating free stream and heat source when viscous dissipation effect is also taken into account. A finite difference solution of mass transfer effects on MHD flow of incompressible viscous dissipative fluid past an exponentially accelerated isothermal vertical plate, on taking into account the viscous dissipative heat, under the influence of chemical reaction through porous medium is evaluated by Gireesh et al [16].…”