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以电流分档的热稳定试验方法的不足及试验分析
投稿时间:2012-04-16    点此下载全文
引用本文:胡东,钱文海,杜志航,于月东,杨文炳.以电流分档的热稳定试验方法的不足及试验分析[J].南京信息工程大学学报,2014,6(1):47~51
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作者单位
胡东 枣庄市气象局,枣庄,277000 
钱文海 枣庄市气象局,枣庄,277000 
杜志航 西安交通大学 电气工程学院,西安,710049 
于月东 南京云凯防雷科技有限公司,南京,210039 
杨文炳 德和盛电气(上海)有限公司,上海,201108 
基金项目:国家自然科学基金(41075025)
中文摘要:为了验证电涌保护器(SPD)的热稳定性能,需要按IEC61643.1进行以电流分档的热稳定性试验,研究中发现:1)热稳定测试中实验室环境下无法模拟真实环境下氧化锌压敏电阻的老化劣化效果,热稳定试验模拟真实环境的充分性有待考量;2)不同参考电压的压敏电阻对电压的敏感程度不一样,当交流电压从640 V变化到680 V时,导通时间变化68.3%,电流变化了289.6%;3)标准要求的电流±10%误差,很大程度上受设备灵敏度的限制而达不到要求.在现有电涌保护器热稳定测试技术的基础上,发现并分析了以电流分档进行的热稳定试验对实际情况模拟的不足之处,这对提高电涌保护器的热稳定测试技术有一定的工程价值.
中文关键词:电涌保护器  压敏电阻  热稳定性试验  分档试验
 
Experiment analysis on deficiencies of thermal stability experiment based on stepping current
Abstract:According to IEC61643.1,the thermal stability experiment based on stepping current should be carried out to test the thermal stability characteristics of Surge Protective Devices (SPD).However,we found some deficiencies in the thermal stability experiment based on stepping current through practical tests.Firstly,the actual degradation of Metal Oxide Varistor (MOV) cannot be exactly simulated in laboratory environment,therefore the simulated thermal stability environment is not sufficient for actual thermal conditions.Secondly,the MOV sensitivity to voltage varied under different voltages.When voltage increased from 640 V to 680 V,the breakdown time changed by 68.3%,while the current changed by 289.3%.Thirdly,the experiment is required to be carried out under a constant current within only ±10% fluctuation,which is unavailable due to the limited sensitivity of test instruments.The above deficiencies,found in thermal stability experiment based on stepping current,are believed to be of engineering values for improvement in thermal stability measuring technology for SPD.
keywords:surge protective devices  metal oxided varistor  the thermal stability experiment  the stepping current experiment  the deficiencies
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