ABB REL650 series Technical Manual page 108

Section 6
Impedance protection
102
1
5
1
1 4
IEC09000309 V2 EN
Figure 33: Characteristic for phase-to-phase measuring
RFPP
1 0.5 ·
2 Z1
LineAng
3
R1
4
X1
5
The fault loop reach with respect to each fault type is presented as in figure 34. Note in
particular the difference in definition regarding the (fault) resistive reach for phase-to-
phase faults and three-phase faults.
( W /phase)
X
4 1
2
3
R
1
5
1
IEC09000309_2_en.vsd
1MRK 506 335-UUS A
( W /phase)
Technical manual