Figure 50: Resistive Reach Of Phase Elements; Figure 51: Resistive Reach Line Construction - GE MiCOM P40 Technical Manual

Chapter 7 - Distance Protection
Network
V02725

Figure 50: Resistive reach of phase elements

The setting Rx Ph. Resistive defines the complete loop resistive reach R
Since a phase-to-phase distance element measures half of the loop, the right-hand resistive reach R, of the
characteristic is equal to half of the setting value.
R = ½ Rx Ph. Resistive
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Figure 51: Resistive Reach line construction

For all V/I vectors which are on the left side of the right blinder the following condition is true:
Ð (V/I - R) £ Z
or
Ð (V - I.R) £ Ð I. Z
The two signals provided to the comparator are:
S = V - I.R
1
S = I.Z
2
128
IED
Dist
Bus
Z
F
+jX
Z
V / I
R

V I
Half of the loop
A
R
LP B
Line
C
of the Distance Protection.
LP
V / I - R
Ð Z
+R
P446SV
P446SV-TM-EN-1