ABB REL650 Applications Manual page 161

Line distance protection relion 650 series

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1MRK 506 334-UUS A

Application manual

FDPSPDIS (21)

ANSI10000194 V1 EN

The connection of Phase preference logic function (PPLPHIZ) between

Five zone distance protection, quadrilateral and mho characteristic

(ZQMPDIS, 21) and Phase selection with load encroachment,

quadrilateral characteristic function (FDPSPDIS, 21)

As the fault is a double ground-faults at different locations of the network, the fault current

in the faulty phase on each of the lines will be seen as a phase current and at the same time

as a neutral current as the remaining phases on each feeder virtually carries no (load)

current. A current through the grounding impedance does not exist. It is limited by the

impedance to below the typical, say 25 to 40 A. Occurring neutral current is thus a sign of

a cross-country fault (a double ground- fault)

ANSI06000553 V1 EN

The currents in the phases at a double ground fault

en06000553_ansi.vsd

Impedance protection

ZQDPDIS (21)

ANSI10000194_1_en.vsd

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