电快速瞬变脉冲群耦合到微机保护装置的途径  

EFT Coupling Path to Microprocessor Protection Device

作　　者：吴文波[1] 王玉峰[1] 孙鹏[1] 乔大为 

机构地区：[1]辽宁科技大学 [2]海城市农电局

出　　处：《安全与电磁兼容》2008年第6期64-67,共4页Safety & EMC

摘　　要：为了抑制电快速瞬变脉冲群(EFT)对微机保护装置的干扰,研究了 EFT 的耦合机理,并采取电磁隔离措施切断 EFT 从一次回路耦合到微机保护装置的途径。首先,开关柜的屏蔽隔板可靠接地并在其表面涂导电涂料;其次,采用转移阻抗小的双层屏蔽电缆与微机保护装置相连;最后,将屏蔽电缆的两端接对地去耦电容。研究结果表明,上述措施可以有效抑制 EFT 对微机保护装置的干扰。EFT coupling mechanism was studied and anti-jamming measures were adopted in order to protect microprocessor protection device from EFF. At first, shielding clapboard should be earthed and coated with conductive paint. Then, microprocessor protection device should be connected with double-deck shielded cables which has small transfer impedance. Finally, shielded cables should connect to decoupling capacitor at both ends. The study results indicate that the above countermeasures protect microprocessor protection device from EFT effectively.

关 键 词：电快速瞬变脉冲群 微机保护 耦合机理 屏蔽电缆 

分 类 号：TM774[电气工程—电力系统及自动化]