ABB RET670 Applications Manual page 398

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IED application

FDPSPDIS (21)

ANSI06000552 V2 EN

The connection of Phase preference logic function PPLPHIZ between

Distance protection zone, quadrilateral characteristic ZMQPDIS (21)

and ZMQAPDIS (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)

W2_FSD1-BLKZ

W2_FSD1-BLKZ

1MRK504116-UUS C

ZMQAPDIS (21)

ZMQPDIS (21)

ANSI06000552-2-en.vsd

Application manual

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