中文摘要：

为了抑制电快速瞬变脉冲群（简称EFT/B）对微机保护装置的干扰,首先分析EFT/B干扰微机保护装置使其发生显示不正常、误动、拒动、甚至系统死机的原因。然后,通过对微机保护装置的外部端口施加EFT/B的试验方法来测试各种保护措施抑制EFT/B的效果。最后,对一套真空度在线监测系统进行EFT/B抗扰度试验测试,试验结果表明,改进的分布式电源、铁氧体磁珠、去耦电容等保护措施对EFT/B具有较好的抑制作用。

英文摘要：

In order to protect microprocessor protection devices from EFT/B,the cause about abnormal of display,malfunction,rejecting act and even a crash of microprocessor protection devices when it suffer from EFT/B was analyzed firstly.Then,effect of each EFT/B countermeasure was tested when external port of microprocessor protection devices was suffering from EFT/B.Finally,a set of vacuum monitoring system on-line was under EFT/B immunity test.The experiment indicated that EFT/B countermeasures such as improved distribution power supply,ferrite bead and decoupling capacitor were effective.