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ß
ANSI11000300_1_en.vsd
1
2
Vcomp
VAB IAB Z FW
=
-
×
2
2
Vcomp
VAB IAB Z REV
=
+
×
IAB jX
×
2
IAB Z REV
-
×
IAB jX
×
2
IAB Z FW
×
ANSI11000300 V1 EN-US
Figure 242: Simplified offset mho characteristics for A-to-B 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-US
(Equation 118)
Voltage and current phasors selected for different measuring loops:
Phase Phase:
Sl.No
Measuring Loop
Voltage Phasor
Current Phasor
1
A-B
VAB
IAB
2
B-C
VBC
IBC
3
C-A
VCA
ICA
Enhanced Reach:
1MRK 502 066-UUS B
Section 7
Impedance protection
443
Technical manual
Summary of Contents for Relion 670 series
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