A Calculation Method of Transformer Fault BPA Based on Spatial Interpolation and IEC60599

Abstract:

The diagnostic conclusions by IEC60599 gas ratio method cannot be directly applied to DS Evidence Theory for information fusion. In order to solve the problem, this research proposed a calculation method for transformer fault BPA based on spatial interpolation. Firstly, the fault characteristic space defined by IEC60599 gas ratio method was analyzed. Based on the analysis results, the entire fault characteristic space was divided into several rectangular units through spatial discretization. Next, the BPA function of faults in each unit was formulated by 8-node hexahedral unit interpolation. In this way, the continuous BPA function of faults in the entire space was obtained. This method not only met the requirements of BPA function but also enabled the numerical reflection of various fault possibilities in the calculation results. Thus, this method extended the application of IEC60599 gas ratio method. With example calculation, the correctness and feasibility of this method in actual engineering projects were verified.

• Periodical: Applied Mechanics and Materials (Volumes 631-632)
• Pages: 563-567
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.631-632.563
• Online since: September 2014
• Authors: Wei Hua Zhang*, Jin Sha Yuan, Tie Feng Zhang, Hong Yang
• Keywords: Basic Probability Assignment (BPA), Fault Diagnosis, Spatial Interpolation, Transformer

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