[1]周万迪,张 升,张 磊,等.氧化锌电阻片在脉冲电流下的残压分散性研究[J].电瓷避雷器,2020,(01):16-22.[doi:10.16188/j.isa.1003-8337.2020.01.003]
 ZHOU Wandi,ZHANG Sheng,ZHANG Lei,et al.Investigation on the Statistical Deviation of Residual Voltage for ZnO-Based Varistorsunder Impulse Currents[J].,2020,(01):16-22.[doi:10.16188/j.isa.1003-8337.2020.01.003]
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氧化锌电阻片在脉冲电流下的残压分散性研究()
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《电瓷避雷器》[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2020年01期
页码:
16-22
栏目:
避雷器
出版日期:
2020-02-20

文章信息/Info

Title:
Investigation on the Statistical Deviation of Residual Voltage for ZnO-Based Varistorsunder Impulse Currents
作者:
周万迪1 张 升1 张 磊2 冯 恺2 蔺家骏2 武康宁2刘文凤2 李建英2 李盛涛2
(1.先进输电技术国家重点实验室, 北京 102200; 2.西安交通大学电力设备电气绝缘国家重点实验室, 西安 710049)
Author(s):
ZHOU Wandi1 ZHANG Sheng1 ZHANG Lei2 FENG Kai2 LIN Jiajun2WU Kangning2 LIU Wenfeng2 LI Jianying2 LI Shengtao2
(1.State Key Laboratory of Advanced Power Transmission Technology, Beijing 102200, China; 2.State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China)
关键词:
氧化锌电阻片 脉冲电流 分散性 多柱并联避雷器 高压直流断路器
Keywords:
ZnO varistors impulse currents deviation paralleled arrester HVDC circuit breaker
DOI:
10.16188/j.isa.1003-8337.2020.01.003
摘要:
大能量吸收场合用氧化锌避雷器采用多柱并联结构,由于氧化锌电阻片之间电学性能分散性的影响导致各并联柱之间存在分流不均匀现象,制约了避雷器整体的能量吸收能力。研究了商用氧化锌电阻片在不同脉冲电流波形(4/10 μs、8/20 μs、2 ms方波)和能量下残压的分散特性以及相应的失效方式,包括单次脉冲和重复脉冲两类实验。单一脉冲下,不同脉冲波形下的残压分散性随脉冲能量呈现两段特性,即小于阈值能量时残压分散性基本不变化,大于阈值后迅速增大。重复脉冲下,氧化锌电阻片晶界出现劣化,但残压分散性基本保持不变。在大电流区,氧化锌电阻片晶界被击穿,其电流-电压特性主要受晶粒电阻控制。因此,电阻片的残压分散性主要受氧化锌晶粒电阻分布以及脉冲下热特性影响。氧化锌电阻片在4/10 μs、8/20 μs脉冲波形下的主要失效形式为沿面闪络,在2 ms方波下主要发生穿孔和炸裂。
Abstract:
The multi-column parallel-connected arrester was usually adopted inhigh voltage direct current(HVDC)circuit breaker. However, the non-uniform current distribution between different columns restricts the energy absorption capability of whole arrester, which was mainlyaffected by the deviation of electrical properties of the ZnO-based varistors. The statistical deviation of residual voltage and failure modes for commercial ZnO-based varistors under 4/10 μs, 8/20 μs and 2 ms square-wave impulse currents were investigated. Two types of experiments were carried out, including single impulse and repeated impulse experiment. For the single impulse experiment, it was found that under all three types of impulses, the standard deviation of residual voltage exhibited two-stage dependence on the impulse energy, i.e., it was flat under a critical energy and then increased sharply. For the repeated impulse experiment, although the grain boundaries of ZnO-based varistors deteriorated, the standard deviation of residual voltage remained stable. In the large current region, the grain boundaries of ZnO-based varistors are breakdown and the current-voltage properties are controlled by the grain resistance. Therefore, the distribution of grain resistance and its thermal properties determine the standard deviation of residual voltage for ZnO-based varistors. It was found that under 8/20 μs and 4/10 μs impulse currents, flashover was the main failure mode; while puncture and cracking happened under 2 ms square-wave impulse current.

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备注/Memo

备注/Memo:
收稿日期:2018-05-24作者简介:周万迪(1985—),男,硕士,主要研究方向为直流电网及其关键技术等。基金项目:先进输电技术国家重点实验室开放基金项目资助和973项目(编号:2015CB251003)。
更新日期/Last Update: 2020-02-20