The electrical model and harmonic characteristics of ZnO varistor considering unipoilar impulse aging polarity effect

被引：1

作者：

Zhang, Jie ^{[1
]}

Han, Yongxia ^{[1
]}

Li, Licheng ^{[1
]}

Deng, Junwen ^{[1
]}

Luo, Xin ^{[1
]}

Liu, Gang ^{[2
]}

Meng, Yongchang ^{[3
]}

Sun, Quan ^{[4
]}

机构：

[1] South China Univ Technol, Sch Elect Power, Guangzhou 510641, Peoples R China

[2] China Southern Power Grid Co Ltd, Elect Power Res Inst, Guangzhou 510080, Peoples R China

[3] CSG EHV Power Transmiss Co, Guangzhou Bur, Guangzhou 510663, Peoples R China

[4] Xian High Voltage Apparat Res Inst Co Ltd, Xian 710077, Shanxi, Peoples R China

来源：

ELECTRIC POWER SYSTEMS RESEARCH | 2022年 / 212卷

关键词：

Polarity effect; Harmonic characteristics; Impulse aging; Electrical model; ZnO varistor; RESISTIVE LEAKAGE CURRENT; ENERGY-ABSORPTION CAPABILITY; SURGE ARRESTER; OXIDE VARISTORS; MECHANISM; BREAKDOWN; FAILURE; TIME;

D O I：

10.1016/j.epsr.2022.108257

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The frequent and high amplitude unipolar impulse currents during the process of switching-on AC filter banks can accelerate the aging of arresters in some ultrahigh-voltage direct-current (UHVDC) and HVDC transmission systems, and result in polarity effect of zinc-oxide (ZnO) varistors. Hence, an improved ZnO varistor electrical model considering the polarity effect caused by unipolar impulse aging was proposed under power frequency voltage. Accelerated aging test under a negative polarity 15/35 mu s impulse current was conducted on ZnO varistor samples to validate the proposed model. Furthermore, the current waveform and harmonic characteristics of the leakage current and its resistive component were simulated. Comparative analysis revealed that the simulation results were generally consistent with the test results. Based on the results, it's inferred that the variation of even-order harmonics are attributed to the polarity effect, and can be considered as one of the aging criterion of arresters.

引用

页数：11