Partial Discharge Localization Using Electromagnetic Time Reversal: A Performance Analysis

IEEE Access

Gevork B. Gharehpetian¹  Ali Ghasemi²  Farhad Rachidi³  Zhaoyang Wang³  Hamidreza Karami³  Hossein Karami⁴  Marcos Rubinstein⁵  Mohammad Azadifar⁵ 

[1] Department of Electrical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran;Department of Electrical Engineering, Shahed University, Tehran, Iran;Electromagnetic Compatibility Laboratory, Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland;High-Voltage Research Group, Niroo Research Institute, Tehran, Iran;Institute for Information and Communication Technologies (IICT), University of Applied Sciences of Western Switzerland (HES-SO), Yverdon-les-Bains, Switzerland;

关键词: Experimental analysis;    partial discharge localization;    time difference of arrival;    electromagnetic time reversal process;    transformer tank;   

DOI  :  10.1109/ACCESS.2020.3015973

来源: DOAJ

【 摘 要 】

In this study, first, a comparison on the application of electromagnetic time reversal (EMTR) and time difference of arrival (TDoA) in partial discharge localization in power transformers is presented. A two-dimensional finite-difference time-domain simulation is used to calculate the signal recorded by the sensors. Results show that, in a transformer tank excluding its windings, both methods yield similar results in terms of location accuracy, although the EMTR method only needs one sensor to localize the partial discharge (PD) source while the TDoA method needs at least three sensors in the 2D localization problem. However, the presence of transformer windings leads to a degradation of the performance of the TDoA method if the line of sight from the source to the sensor is blocked by any of the winding blocks. On the other hand, the presence of the transformer windings has an effect on the localization of PD sources that occur between two adjacent phase windings when the distance between the outer winding distances is shorter than the minimum wavelength, λ_min. The degradation is directly caused by the diffraction limit. It is shown that, if the distance between two adjacent phase windings is greater than λ_min, the EMTR process can locate PD sources occurring between two adjacent phase windings with acceptable accuracy. A case of occurrence of PDs in close proximity (less than λ_min/2) to a single metallic object is analyzed both numerically and experimentally. The analysis reveals that although a degradation in the accuracy of the localization is observed compared to the case of longer distances between the PD source and the metallic object, a reasonable localization error of 10 mm (corresponding to λ_min/10) is obtained.

【 授权许可】

Unknown