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Time Coordination by Time Adaptive Function

Keywords: time overcurrent relay, coordination, distributed generation.

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Abstract:

this paper presents a new coordination process for time overcurrent relays. the purpose of the coordination is to find a time element function that allows it to operate using a constant back-up time delay for any fault current. then, a simple methodology is proposed that improves the time coordination even with the presence of distributed generation. experiments were carried out in a laboratory test situation using signals from a power electrical system physics simulator. a virtual prototype of the time overcurrent relay with adaptive algorithms was developed using real time acquired signals. the tests showed the enhanced performance of the overcurrent relay.

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