New selective earth leakage protection scheme based on zero-sequence current amplitude and phase comparison
WANG Yan-wen
LIU Wen-jun
GAO Yan
WANG Nian-bin
QIU Yuan-jun
Abstract：Deduced zero-sequence current formulae when single-phase earth leakage happened in underground low voltage distribution networks' different places, compared zero-scquence current amplitude relationships and phase relationships with current phasor' s real part and imaginary part, and proposed a new selective earth leakage protection scheme. The scheme was verified by simulation via Matlab and calculation via Fast Fourier Transform. The results indicate that this method achieves lateral and longitudinal selectivity, avoids zero-sequence voltage' s collection, enhances protection reliability, and cuts hardware' s cost.
Keywords：zero-sequence currentamplitude and phase comparisonearth leakage protectionlow voltage distribution networksFast Fourier Transform(FFT)
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 515-519 )