| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 95 === In Taiwan, the main protection scheme of transmission lines include current differential relay, distance relay and pilot wire relay. The backup protection scheme of transmission lines include three zone distance relay and directional overcurrent relay. Among them, the settings of the backup protective relays need to be coordinated. According to the principle of the distance relay settings at present, this paper plans to use the relay settings coordination theory, the network admittance matrix abbreviation and the fault current distribution calculation trying to develop the windowlizing calculating program of distance relay settings. Then using ASPEN software to simulate directional overcurrent relay settings to achieve the coordination between distance relays and directional overcurrent relays of the transmission line. This paper hopes to evaluate the coordination situation of the domestic transmission lines by computer procedure immediately and pinpoint the problems. Then studying the way to improve and providing more suitable approach of the Zone-2 setting of the distance relay.
The results of the systematic simulation have been observed, up till now, that the influences of the apparent impedance caused by the infeed and outfeed effects can't be ignored, because the distributed generations are increasing. Or it will cause distance relays to make misjudgment whether the fault point is within the protection zone. this paper further considers the situation in case of one transmission line outage (N-1). The new Zone-2 setting can be used in more extensive power system structure and needn’t change the settings when one transmission line outage temporary. From the results of this paper, the promotion of the Zone-2 protection zone also be observed. So that the approach can be the reference when revising the principle of the distance relay settings at present.
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