R
X
Distance measuring zone
Phase selection
”Quadrilateral” zone
(ohm/phase)
(ohm/phase)
en05000674.vsd
IEC05000674 V1 EN-US
Figure 161: Operation characteristic for FRPSPDIS 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
162. 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.
1MRK 506 369-UEN B Section 8
Impedance protection
Line distance protection REL670 2.2 IEC 317
Application manual
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