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Application of df/dt in power system protection and its implementation in microcontroller based intelligent load shedding relay

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4 Author(s)
Shih, L.J. ; Energy Syst. Res. Center, Texas Univ., Arlington, TX, USA ; Lee, W.J. ; Gu, J.C. ; Moon, Y.H.

Several practical intelligent setting schemes that consider the effect of df/dt are suggested and simulated for a power system operating in an underfrequency situation. Considerations for df/dt relay setting are discussed. These intelligent setting schemes have made a positive improvement in the underfrequency condition. As an extension of these new intelligent control schemes, a microcontroller based intelligent under/over frequency relay is introduced. With its advanced hardware and intelligent software, this microcontroller has the advantages of high flexibility, less cost, and high communication ability

Published in:

Industrial and Commercial Power Systems Technical Conference, 1991. Conference Record. Papers presented at the 1991 Annual Meeting

Date of Conference:

6-9 May 1991

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