Partial Discharge Location of Transformers Based on Multi-polynomial Resultants Approach and 2-Lattice Search
In order to quickly screen the location of transformer partial discharge, the paper presents a design for an inte-grated ultrasound and ultra-high frequency sensor array layout, and proposes a searching and positioning method for multiple polynomial roots-double grid local discharge based on this design. The basic principle of this method is as fol-lows: Firstly, a two-layer grid is generated offline to search the virtual space to benchmark the real space; secondly, the multi-polynomial resultants approach is used to solve the time difference equations, and the initial coordinates are ob-tained; then, based on the initial coordinate points, the 2-Lattice search method is used to solve the target fault coordinate points. In order to verify the effectiveness of the method, a transformer partial discharge test platform was built with built-in needle-board defects, and the fault location deviation under the method was calculated and analyzed. The results show that the delay difference of the integrated sensor array designed in this paper is significant. Compared with the re-sults directly obtained by the traditional multiple polynomial roots method, the deviation values of the localization results after the double-grid search are reduced by 40％ and 16.7％, and the 2-norm values are reduced by 53.5％ and 6.0％, with a maximum positioning error of no more than 5 cm. This method can provide theoretical reference for the practical appli-cation of discharge localization in oil-immersed distribution transformers.
transformerpartial dischargelocationultra high frequencyultrasonic
万方数据
维普
