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Evaluation of transformer core contribution to partial discharge electromagnetic waves propagation

Rostaminia, R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijepes.2016.03.054
  3. Publisher: Elsevier Ltd
  4. Abstract:
  5. Accurate Partial Discharge (PD) measurement requires the expansion of the measurement frequency range to Ultra High Frequency (UHF) band. For this it is needed to implement modern techniques when monitoring an important element of power system, such as power transformer. Different kind of experimental models, such as insulation defect models, and the complete transformer windings models are used to simulate the partial insulation failure situations which occur in a real transformer. However, since in these models, some kind of simplifications are employed which may result in an electromagnetic waves (EM) propagation pattern different from what exists in a real transformer and encounter errors in its PD measurement results. In this paper, the transformer core effects on PD EM wave propagation are investigated. To address this concern, different core designs are simulated. Finite Integration Time (FIT) method is used for electric field calculation through application of Microsoft CST microwave studio Software. The probes recorded electric fields are analyzed using wavelet transform (WT). A new approach based on energy scale coefficient (for each decomposition level) is used for mother wavelet selection. Results of these simulations demonstrate how existence of core and its design affect the characteristics of measured PD signal
  6. Keywords:
  7. Core modeling ; Power transformer ; UHF method ; Wavelet transform ; Application programs ; Circular waveguides ; Electric fields ; Electric windings ; Electromagnetic waves ; Partial discharges ; Transformer windings ; Wave propagation ; Wavelet decomposition ; Core model ; CST microwave studio ; Electric field calculations ; Measurement frequency ; Partial discharge measurements ; Propagation pattern ; Ultra-high frequency bands ; Electric discharges
  8. Source: International Journal of Electrical Power and Energy Systems ; Volume 83 , 2016 , Pages 40-48 ; 01420615 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0142061516305828