摘要
B+C型电涌保护器是将B级大通流型SPD和C级箝位限压型SPD设计在一个防雷装置中,以降低输出端电压和减小安装空间。笔者运用行波理论阐述了在B+C限压型防雷器中,用电路学原理分析8μH退耦器代替5 m线缆的观点是错误的,并结合实验验证了行波理论的正确性。结果表明,性能相同的压敏电阻并联能起到分流及延长寿命的作用;当退耦器电感量再增大时(≥8μH),对输出端残压的影响不大。
SPD of B＆C type is a device conjoined with lightning protection devices with throughflow functioned B and voltage limiting functioned C in order to decrease the outlet voltage and reduce the installation space. In this kind of SPD, based on the traveling wave theory it is considered that, replacing the 5-meter cable by one 8 μH decoupled device is wrong, and the correctness of traveling wave theory is proved with experiments. The result shows that two or more parallel connected MOV with the same properties can share current and extend the service life when the inductance of the de- coupled device increase again （≥ 8 μH）, that makes little contribution to the residual voltage at outlet.
出处
《电瓷避雷器》
CAS
北大核心
2009年第5期46-49,共4页
Insulators and Surge Arresters
基金
公益性行业科研专项(编号:GYHY200806014)
江苏省大学生实践创新项目(编号:08CX0008)
关键词
电路理论
行波理论
退耦器
能量配合
输出端残压
circuit theory
traveling wave theory
decoupled device
energy coordination
residual output voltage
