ß
IEC11000300-2-en.vsd
1
1 2
1 2
2
Ucomp
UL L
IL L Z Fwd
2
1 2
1 2
2
Ucomp
UL L
IL L Z REV
1 2
IL L
R
1 2
2
IL L Z REV
1 2
IL L
jX
1 2
2
IL L Z Fwd
IEC11000300 V2 EN
Figure 153:
Simplified offset mho characteristics for L1-to-L2 fault in zone 2
Operation occurs if 90° ≤ β ≤ 270°.
Impedance defined in the Figure
.
2
2
Z Fwd
Z Fwd
ImpedanceAng
=
Ð
2
2
Z R
Z Rev ImpedanceAng
ev
=
Ð
GUID-007D6357-B7CF-4C21-B772-2245F06C83A2 V2 EN
(Equation 56)
Voltage and current phasors selected for different measuring loops:
Phase Phase:
Sl.No
Measuring Loop
Voltage Phasor
Current Phasor
1
L1-L2
1 2
UL L
1 2
IL L
2
L2-L3
2 3
UL L
2 3
IL L
3
L3-L1
3 1
UL L
3 1
IL L
Enhanced Reach:
1MRK502052-UEN B
Section 7
Impedance protection
329
Technical manual
Summary of Contents for Relion REG670
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