Design Strategy of Anti-Electromagnetic Interference for Microcomputer Relay Protection System

Microcomputer relay protection hardware system reliability design is directly related to power system safe and stable operation. Aiming at the mistake switch and misinformation resulted from electromagnetism interference of microcomputer relay protection system based on the fourth age´s high performance microprocessor, the paper presented improving design concept of anti-electromagnetic interference in the hardware platform system. It was analyzed in detail to the electromagnetism environment located by microcomputer relay protection system, electromagnetic interference sources, anti-electromagnetic interference mechanism, and behavior of digital circuits under the interference. Also it was studied to the design compatibility of anti-electromagnetic interference, and summarized up that the measures of anti-electromagnetic interference should be taken in the hardware design of microcomputer relay protection system. Experimental results show that these measures are feasible and effective.