CALCULATION OF POWER TRANSFORMERS HEALTH INDEXES
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2010, Vol 34, Issue 34
Abstract
In order to prevent possible defects of power transformers and to avoid losses which occur after taking them out of service, it is important to know the state of their insulation systems. For this purpose, health index is used, which quantifies the global state of power transformers. To determine power transformers state, a multitude of factors are taken into consideration and a number of tests are conducted, in order to evaluate their global state as accurate as possible. In literature, Health index is calculated based on the model of twenty-four diagnostic factors. In this paper, expanding the list with three factors (loss factor at very low frequency, conductivity factor and polarization index) is a new model proposed. The health index was determined using special software, which has the values of the twenty-seven diagnostic factors as entry data. Using the health index, the condition of a power transformer can be assessed. This factor allows the estimation of remaining transformer lifetime, taking into account some of the most important characteristics of its insulation system. The health index is strongly influenced by the dielectric losses which occur inside electro-insulating components volumes, but also by the conductivity factor and the polarization index.
Authors and Affiliations
Bogdan GORGAN, Petru NOTINGHER, Laurenţiu BADICU, Gabriel TĂNĂSESCU
Keywords
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