电瓷避雷器Issue(3)：54-60,7.DOI:10.16188/j.isa.1003-8337.2025.03.007
动车组车顶避雷器ZnO压敏电阻片老化现象分析
Aging Phenomenon of ZnO Varistors in Electric Multiple Unit(EMU)Roof Arrester
摘要
Abstract
The segmented power supply of the EMU poses severe challenges to the roof arrester due to the rich harmonics and transient overvoltage.The operating condition of the EMU is investigated,suggesting that the harmonics are mainly 25th,27th,and 29th,and the maximum of total harmonic distortion(THD)even reaches to79.8%.Aging tests of ZnO varistors are conducted after precise simulation of voltage waveforms.Current density-electric field curves are not symmetric for the positive and negative direction,and ZnO varistors degrade more severely in the negative direction,where α decreases from 43.4 to 30.8 and JL increases from 0.85 μA/cm2 to 2.51 μΑ/cm2.It is obtained that two dynamics are predominant during aging,that is,trapping of electrons by the empty interface states and the migration of adsorbed oxygen(Oad).The findings provide data support for the improvement in stability of ZnO varis-tors against complicated conditions and benefit the understanding of aging mechanism.关键词
ZnO压敏电阻片/老化/动车组车顶避雷器/波形畸变率Key words
ZnO varistors/aging/EMU roof arrester/THD引用本文复制引用
赵霞,雷挺,沈海滨,张搏宇,吕雪斌,郭子炘..动车组车顶避雷器ZnO压敏电阻片老化现象分析[J].电瓷避雷器,2025,(3):54-60,7.基金项目
中国电力科学研究院有限公司研究开发项目"高频复杂工况下避雷器用ZnO电阻片劣化机理研究"(编号:GY83-22-003、524200220015).Project supported by the Science and Technology Project of China Electric Power Research Institute"Research on the Aging Mechanism of ZnO Varistors in Metal Oxide Arrester under Complicated Operation Conditions with High Frequencies"(No.GY83-22-003 and 524200220015). （编号:GY83-22-003、524200220015）
