Abstract
Transformers are one of the most important components of the power
system. It is important to maintain and assess the condition. Transformer
lifetime depends on the life of its insulation and insulation life is also
strongly influenced by moisture in the insulation. Due to importance of
this issue, in this paper a new method is introduced for determining the
moisture content of the transformer insulation system using dielectric
response analysis in the frequency domain based on artificial bee colony
algorithm. First, the master curve of dielectric response is modeled.
Then, using proposed method the master curve and the measured dielectric
response curves are compared. By analyzing the results of the comparison,
the moisture content of paper insulation, electrical conductivity of the
insulating oil and dielectric model dimensions are determined. Finally,
the proposed method is applied to several practical samples to demonstrate
its capabilities compared with the well-known conventional method.
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