组合波负峰对浪涌防护影响研究

发布时间：2018-06-29 23:41

本文选题：组合波 + 负峰　；参考：《电瓷避雷器》2017年05期

【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。
[Abstract]:Combination wave is a necessary waveform for surge protector performance test and surge immunity test. However, there are some differences in the definition of combined wave between IEC and IEEE standards at present, which mainly depend on whether the waveform has negative peak or not. Therefore, the influence of the existence of combined negative peaks on surge protection is needed. Two kinds of combinational wave generation circuits are constructed by using EMTP software to produce the combination wave with no negative peak and negative peak respectively. At the same time, the difference between residual voltage and absorption energy of varistor is analyzed by using IEEE varistor model. Finally, the influence of the cable length on the load terminal voltage after the impact of two combined waves under different load properties is discussed. The results show that the existence of negative peak of combined wave has little effect on the residual voltage of varistor, but has great influence on the residual voltage waveform, and the hoop time of varistor under the impact of combined wave with negative peak is shorter. The energy absorbed by varistors with negative peaks is always smaller than that without negative combined waves. The relative voltage difference between the two combined waves increases with the increase of cable length, and the change of resistive load and capacitive load is more obvious.
【作者单位】：乌海职业技术学院电力工程系;
【分类号】：TM862

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