组合波负峰对浪涌防护影响研究  

Study on Influence of Combination Wave Undershoot on Surge Protection

作　　者：武海军 

机构地区：[1]乌海职业技术学院电力工程系,内蒙古乌海016000

出　　处：《电瓷避雷器》2017年第5期160-164,共5页Insulators and Surge Arresters

摘　　要：组合波是电涌保护器性能试验与浪涌抗扰度试验的必备波形,但是目前IEC和IEEE相关规范针对组合波的定义存在一定差别,主要在于波形是否存在负峰,因此需要组合波负峰存在与否对浪涌防护的影响。利用EMTP软件搭建两种组合波发生电路,分别产生不存在负峰与存在负峰的组合波,同时结合IEEE压敏电阻模型进行仿真冲击,分析压敏电阻残压与吸收能量的差异。最后讨论不同负载性质下连接电缆长度对两种组合波冲击后负载端电压的影响。分析结果表明:组合波负峰存在与否对压敏电阻残压数值影响不大,但对残压波形影响较大;压敏电阻在存在负峰的组合波冲击下的箍位时间较短。存在负峰的组合波冲击时压敏电阻吸收的能量始终小于不存在负峰组合波冲击情况。两种组合波冲击后负载端相对电压差异随着电缆长度的增加而增大,阻性负载和容性负载变化更为明显。Combination wave is essential in surge protection device （SPD） performance test and surge immunity test. But IEEE Std. C62.41.2and IEC Std. 61000-4-5 have some difference in waveform undershoot definition. So study on influence of combination wave undershoot on surge protection is necessary. The combination wave generator （CWG） with and without undershoot are established in EMTP while the IEEE varistor model is also applied. Residual voltage and its waveform with different types of loads are analyzed. Voltage differenees with and without undershoot under different lengths of cable are also dis- cussed. Results show that the presence or absence of undershoot has no effect on residual voltage, but the presence of undershoot will reduce the clamping time. Energy absorbed by varistor without undershoot is always higher than that with undershoot. Voltage differences with and without undershoot increase with the increasing of cable length which is particularly obvious under resistive and capacitive loads.

关 键 词：组合波 负峰 压敏电阻 负载 

分 类 号：TM862[电气工程—高电压与绝缘技术]