微机继电保护硬件系统的抗电磁干扰设计策略

Design strategy of electromagnetic anti-jamming for hardware system of microcomputer relay protection

针对电磁干扰可能导致的误跳闸或误报警,提出了改进硬件平台系统的抗电磁干扰设计理念。对微机继电保护系统所处的电磁环境,电磁干扰源、抗电磁干扰机理和数字电路在干扰下的行为作了详细剖析,研究了设计电磁兼容性问题,总结出了微机保护系统硬件设计中应采取的抑制电磁干扰的措施。实验效果表明,所总结出的合理布局与布线及良好的接地措施是可行和有效的。

Aiming at the mistake switch and misinformation resulted from electromagnetism interference,the paper proposes an improved design thought of electromagnetic anti-jamming in hardware platform system.The electromagnetism environment located by microcomputer relay protection system,sources of electromagnetic interference,mechanism of electromagnetic anti-jamming,and behavior of digital circuits under the interference are analyzed in detail.Also the design compatibility of electromagnetic anti-jamming is studied,and the measures of electromagnetic anti-jamming should be taken in the hardware design of microcomputer relay protection system are summarized.The experiment result shows that the above summarized measures of reasonable composition and cabling as well as better grounded are feasible and effective.