The integrity of the cellulosic insulation in power transformers is considered one of the most
relevant parameters that affects their performance and reliability. Electric faults, such as …

The cellulose based oil impregnated insulating system of power transformers is exposed to
significant aging due to heat, oxygen, moisture and acids during operation time. This …

The dielectric paper of power transformers is subjected to ageing caused by high
temperatures and chemical reactions in the dielectric oil. The electromagnetic forces that …

Power transformers are essential elements in electrical systems and the end of their useful
life is frequently conditioned by the state of the cellulosic insulation materials inside them …

Natural esters have become of interest for the industry in recent years as dielectric liquids for
power transformers, and many studies are focused on their dielectric and chemical …

The original properties of solid (cellulose) insulation in a transformer deteriorate under
thermal stress. Decomposition products (gases and furanic compounds) are released, which …

Power transformers life is limited fundamentally by the insulation paper state, which can be
analysed through different techniques such as furanic compound concentration, dissolved …

Nowadays, reliability of power system is of great importance. Therefore, the condition of
transformers as the expensive and critical components of a power system should be …

This paper presents the remaining lifetime calculation of power transformers paper
insulation and consequently of power transformers. The calculations are performed based …

58 PT&D June/July 2003 www. powertrans. com. au 20% of its initial value. This point is
regarded as the end of life criterion for transformer insulation, because the paper loses its …