Kc. Lu et Nm. Chen, THE PHASOR COMBINATION DIFFERENTIAL PROTECTION FOR LE-BLANC TRANSFORMERS, IEEE transactions on power delivery, 12(4), 1997, pp. 1434-1438
The main electrical protection of Le-Blanc connection transformers tha
t supply the single-phase power to electric railway in Taiwan is the o
vercurrent protection. This paper presents a mon complete protective s
cheme, the differential protection, for Le-Blanc by phasor combination
method. The calculation procedure and the good mismatch results of a
practical design example using the parameters of a Le-Blanc transforme
r of Taiwan Railway Bureau(Tairail) are described in this paper. In ad
dition, using the normal current transformers and electromagnetic type
transformer differential relays to completely construct the protectiv
e scheme is another merit of this algorithm.