ABB RELION 670 SERIES Applications Manual page 344

Line distance protection

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Impedance protection

Phase selection

"Quadrilateral" zone

IEC05000674 V1 EN

Operation characteristic for FRPSPDIS (21) in forward direction for

three-phase fault, ohm/phase domain

The result from rotation of the load characteristic at a fault between two phases is

presented in fig 164. Since the load characteristic is based on the same measurement as the

quadrilateral characteristic, it will rotate with the quadrilateral characteristic clockwise by

30 degrees when subject to a pure phase-to-phase fault. At the same time, the

characteristic "shrinks" by 2/√3, from the full RLdFw/RLdRv reach, which is valid at load

or three-phase fault.

Distance measuring zone

Line distance protection REL670 2.2 ANSI

1MRK 506 369-UUS -

en05000674.vsd

Application manual