基于PSPICE仿真与试验的压敏电阻并联性能  

Performance of MOV Parallel Connection Based on PSPICE Simulation and Test

作　　者：应凌云[1] 孙涌 张雷[1] 

机构地区：[1]福建省南平市气象局,福建南平353000 [2]北京雷电防护装置测试中心,北京100176

出　　处：《电瓷避雷器》2011年第3期56-60,64,共6页Insulators and Surge Arresters

摘　　要：金属氧化物压敏电阻(MOV)是防护电气电子设备因受雷电闪击及其他瞬态电磁干扰造成传导过电压危害的有效器件,它的性能直接影响安全保护效果。国内外常将几片MOV并联在一起使用,这样不仅可降低残压,还可起到分流延长MOV寿命的作用。利用PSPICE仿真工具,对不同并联片数MOV进行大量仿真模拟,绘制出残压、通流的变化关系,得到推论:5片以上并联设计可使残压降低大约35%;当并联片数达到6片时,再增加MOV,对残压和通流的优化作用已相当有限;MOV的并联使用情况依然符合伏-安特性,而且残压的降低不随冲击幅值的变化出现折点。针对推论结果使用冲击发生器Haefly PSURGER30.2进行试验验证。结果表明:从残压参数的优化和成本控制角度考虑,6片MOV的并联是最佳方案;由于ΔU在不同幅值冲击时为线性单调函数,可根据ΔU的斜率推算残压值。Metal oxide varistor （MOV） is the effective component which protects electronic devices from overvohage which caused by lightning strike or other instantaneous electromagnetic interferences, and its performance directly influences the security effect. Some MOV pieces was used in parallel connection together, that not only can reduce the residual pressure, but also can shunt current and extended life time of MOV. Through the PSPICE simulation method, different pieces MOV parallel connection is simulated, the changing relationship of residual voltage and current is drew. The residual voltage can be re.dueed about 35% with 5 or more pieces MOV parallel connection design; the optimization of residual and current is quite finity with more than 6 pieces MOV parallel connection design. The use condition of MOV parallel connection is still in accordance with the characteristic of V-I, and reduce of residual voltage will not appear turning point with the changing of impact amplitude. According to the inference result, the test validation is carried out through Haefly PSURGER30.2 impulse generator. The result showed that： from the point of residual voltage parameters optimization and cost control, 6 pieces of MOV parallel connection is the best scheme. Cause △U in different amplitude impulses show a linear drab function form, the residual voltage value can be calculated by slope of △U.

关 键 词：金属氧化物压敏电阻 PSPICE仿真 冲击试验 

分 类 号：TM862[电气工程—高电压与绝缘技术]