R
X
Distance measuring zone
Phase selection
”Quadrilateral” zone
IEC09000049-1-en.vsd
)
/
(
phase
W
)
/
(
phase
W
IEC09000049 V1 EN-US
Figure 140: Operating 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
. 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 will "shrink" by 2/√3,
from the full
RLdFw and RLdRv reach, which is valid at load or three-phase fault.
Section 7
1MRK 502 066-UUS B
Impedance protection
284
Technical manual
Содержание Relion 670 series
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