Research On Electromagnetic Compatibility For The Microprocessor Based Protective Relay And Automechanism

The micro-computer-based protection and automechanism plays an important role in the power system's safe operation. With the invention of icrocomputer-based protection and automechanism,these device improved the dependability and stability of electric power facility in running greatly,and provides much advantage for mount, test, overhaul, operation. but because it lies in the substation where the EMI is harsh, the scene of project is very complex,so the EMC of the protection is a very serious problem. It becomes a serious problem concerned by the engineers and technicians about how to mediate the operation environment with the microcomputer-based protection and automechanism.The author carries through the some immunity tests to the CSL101B-2 protection according to the IEC60255-22 series standards, and tries modeling the EMC of protection devices with the traditional circuit-theory and some relative electromagnetic-field theory, referring to the results of disturbance tests.The paper is be established in production scene, analysed how to improve the immunity of protection to EMI of the protection and automechanism by expatiated the EMI transmission approach. This paper draws some suggestions about raising anti-interference ability of protection device and automechanism in projects.