Electrical energy is the paramount need in a nation’s development. To cater for large demand for electricity there is a need for reliable and proficient power system. For a power system to work reliably, the role of Transformers is critical. Health of the transformer mainly depends on its insulation. Among the different insulating material used in transformers, mineral oil is the most widely us...

The Oil-Impregnated Paper (OIP) insulation is commonly utilized as the foremost type in case of a converter transformer, which constantly and unavoidably affected by elevated temperature different stresses arising during mode operation. It causes safety risk to system transformer. Because this, present study examines effect on OIP using FDS technique function frequency temperature. Frequency Do...

The reliability of electrical energy networks depends on the quality and availability of electrical equipment like power transformers. Local failures inside their insulation may lead to catastrophic breakdowns and can cause high outage and penalty costs. Beside the strength and type of a PD, the geometric PD position is of major interest concerning risk evaluation of the flaw. Conventional PD m...

Transformer fault detection and diagnosis is becoming more important due to the restructuring of the electric power industry. In this era of deregulation, loading transformers to their optimum capacity is becoming normal practice, which in turn applies high stresses on the insulation of the transformers and increases the probability of occurrence of internal incipient faults. Such faults can le...

Considering the number of failures in high voltage power transformers caused by problems in bushing and winding insulation, it is important to study means for diagnosing incipient failures, to avoid long unavailability periods and its consequences. The aim of this work is to study detection and measurement procedures, concerning the evaluation of position of partial discharge inside the transfo...

Random energisation of power transformers often causes significant inrush currents and steep switching voltage wave fronts that are responsible for several adverse effects like huge current forces in the transformer windings, dielectric stress of the transformer winding insulation and temporary overvoltages. Controlled switching taking into account the residual flux is able to eliminate these i...

In recent years, the use of biodegradable fluids as liquid insulation for distribution and power transformers is spreading. The main used are natural synthetic esters, although hydrocarbons have been recently proposed. Biodegradable a much lower environmental impact than mineral oil, limiting risk soil contamination in leaks, which makes them suitable solution applications such offshore or rail...