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Keywords

zinc oxide resistor; multiple pulses; pulse waveform; thermal characteristics; failure modes

Abstract

Multiple lightning strikes can cause thermal failure of arresters under impact, posing a threat to the safe operation of the power system.This article establishes an electric-thermal instantaneous coupling model for zinc oxide resistors under multiple pulse current waveforms, proposes an integration criterion for equivalent current energy, compares the thermal characteristics of zinc oxide resistors under multiple lightning pulse waveforms, continuous pulse current waveforms, and equivalent current waveforms, and analyzes the influence of pulse current waveforms on the thermal characteristics, degradation forms, and failure mechanisms of zinc oxide resistors based on the simulation test results of impact damage of zinc oxide resistors under continuous pulse currents of different waveforms.The impact time interval influences the thermal characteristics of zinc oxide resistors.The longer the pulse time interval, the more obvious the saturation trend of temperature rise with the increase of pulse frequency.Under the same waveform energy integration conditions, the pulse current waveform has little effect on the thermal characteristics of zinc oxide resistors.However, the pulse current waveform influences the failure mode of the zinc oxide resistor, with insulation perforation being the main mode at 8/20 μs, insulation burning being the main mode at 120 μs sine half wave, and insulation layer carbonization being the main mode at 210 μs sine half wave.

DOI

10.19781/j.issn.1673-9140.2025.05.029

First Page

306

Last Page

314

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