Variable-window algorithm for ultra-high-speed distance protection

This paper presents a new concept in ultra-high speed distance relay for power line protection. The idea is based on the use of a sampling window shorter than usual to speed commutation. The reduction in protection time is obtained through a variable window that is expanded sample by sample until a...

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Veröffentlicht in:IEEE transactions on power delivery 2003-04, Vol.18 (2), p.412-419
Hauptverfasser: Fazio, G., Lauropoli, V., Muzi, F., Sacerdoti, G.
Format: Artikel
Sprache:eng
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Zusammenfassung:This paper presents a new concept in ultra-high speed distance relay for power line protection. The idea is based on the use of a sampling window shorter than usual to speed commutation. The reduction in protection time is obtained through a variable window that is expanded sample by sample until a satisfactory precision is reached in the calculation of fault quantities. The right window length is obtained automatically via software and time-by-time changes depending on the characteristics of the fault. The algorithm is based on the equation associated to the R-L fault circuit, whose solution is obtained using the phase modified Fourier transform. To validate the proposed procedure, a large number of simulations are performed with reference to an existing 150-kV subtransmission line. In comparison with other solutions, the relay proposed here is very cost-effective and makes it possible to achieve ultra-high speed fault localization not only on high-voltage (HV) networks but also on medium-voltage (MV) distribution networks.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2002.807159