Calculation method for the resistive current of metal-oxide surge arresters using model parameters solved by the Levenberg-Marquardt algorithm

Abstract

Listen

Translate article

Abstract Resistive current analysis is a crucial technique for evaluating the operational status of metal-oxide surge arresters (MOSAs). Various precise methods for calculating resistive current have been proposed. However, most existing approaches focus on simulation rather than experimental validation, and comprehensive studies on the performance of these methods in site tests are lacking. This paper introduces a resistive current calculation method based on the Levenberg-Marquardt (LM) algorithm. This method determines the fitting parameters of the MOSA equivalent model using the LM algorithm and then calculates the resistive current based on the solved parameters and voltage waveforms. Experimental validation on a 10 kV arrester demonstrates that the LM algorithm has significant accuracy and speed advantages over heuristic algorithms in parameter estimation. Additionally, while the fundamental components of the resistive current calculated by the LM method are consistent with those obtained by existing current orthogonality and harmonic analysis methods, significant differences are observed in the harmonic components. The resistive current calculated by the proposed method aligns more closely with theoretical expectations, rendering the results more reliable.