NDLI: Variable-Window Algorithm for Ultra-High-Speed Distance Protection

Content Provider	IEEE Xplore Digital Library
Author	Fazio, G. Lauropoli, V. Muzi, F. Sacerdoti, G.
Copyright Year	1981
Abstract	This paper presents a new concept in ultra-high-speed distance relays 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 change 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 EHV networks but also on HV distribution networks.
Starting Page	66
Ending Page	66
Page Count	1
File Size	355024
File Format	PDF
ISSN	02721724
Volume Number	22
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-08-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Protection Gas insulated transmission lines Circuit faults Optical fiber devices Protective relaying Temperature sensors Monitoring System testing Optical fiber sensors Optical fiber testing computer relaying Distance protection transmission and distribution systems
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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