| Summary: | 碩士 === 崑山科技大學 === 電機工程研究所 === 94 === The differential relays are the fast movement types to protect the electric systems. Therefore, it can be the main protection using in the power system, and doesn’t need to coordinate with the other electric protection. In addition, the differential relays protected the electric system is similar to the over-current relays. Both apply to the protection of different kinds of electric equipment in power system. However, when the electric equipment, which is protected by over-current relays, occurs troubles, it takes more time to alienate and remove those faults. Hence, it lighter changes structure due to electromagnetic and mechanical strength. It may get serious to produce electric arc and fire in electric equipment so as to result in the destruction of the switch equipment or the explosion of sleeve pipe. Hence, the electric differential relays are the most efficent way to rapidly isolate inner troubles in electric equipment and to protect power system.
This thesis is using electromagnetic transients program to combine with simulator F6150 in order to investigate the influence of temporary behavior in accidental process of power system on the electric differential relays, and then to improve the electric relays to mark and put, and to prevent and protect electric mistakes in the process of troubles. The project is based on practical model to realize the digitalization of protecting the electric transients performance.
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