Mm. Eissa et Op. Malik, Investigation of impedance based protection technique for EHV 3-terminal double circuit lines, IEE P-GEN T, 147(6), 2000, pp. 317-321
Citations number
12
Categorie Soggetti
Eletrical & Eletronics Engineeing
Journal title
IEE PROCEEDINGS-GENERATION TRANSMISSION AND DISTRIBUTION
A digital impedance based protection scheme for a 3-terminal transmission l
ine has been implemented on a digital signal processor board and tested on
a physical model of a double-circuit 3-terminal line with a source at each
end. One combined relay at each terminal of the double-circuit line, instea
d of two relays, is proposed. Each relay is fed by three voltage and six cu
rrent signals. Realtime tests conducted on the physical model for various f
aults show that high fault resistance at the teed point, current infeed, re
mote-end infeeds, fault location, source impedance and far-end faults cause
no problem in proper relay operation. Also, 100% of the lines are protecte
d.