Zone 2 Phase Reach Settings; Zone 3 Phase Reach Settings; Zone 4 Reverse Settings With No Weak Infeed Logic Selected; Zone 4 Reverse Settings With Weak Infeed Logic Selected - GE MiCOM P40 Agile Technical Manual

Application Notes
MiCOM P40 Agile P442, P444
The Line Angle = 80°.
Therefore actual Zone 1 reach, Z1 = 4.64 / 80° Ω secondary.
3.4.1.6

Zone 2 Phase Reach Settings

Required Zone 2 impedance =
(Green Valley-Blue River) line impedance + 50% (Blue River-Rocky Bay) line impedance
The Line Angle = 80°.
Actual Zone 2 reach setting = 7.56 / 80° Ω secondary
3.4.1.7

Zone 3 Phase Reach Settings

Required Zone 3 forward reach =
(Green Valley-Blue River + Blue River-Rocky Bay) x 1.2
Actual Zone 3 forward reach setting = 11.16 / 80° ohms secondary
3.4.1.8

Zone 4 Reverse Settings with no Weak Infeed Logic Selected

Required Zone 4 reverse reach impedance = Typically 10% Zone 1 reach
Actual Zone 4 reverse reach setting = 0.46 / 80° ohms secondary
3.4.1.9

Zone 4 Reverse Settings with Weak Infeed Logic Selected

Where zone 4 is used to provide reverse directional decisions for Blocking or Permissive
Overreach schemes, zone 4 must reach further behind the relay than zone 2 for the remote
relay. This can be achieved by setting: Z4 ≥ ((Remote zone 2 reach) x 120%) minus the
protected line impedance:
Remote Zone 2 reach =
(Blue River-Green Valley) line impedance + 50% (Green Valley-Tiger Bay) line impedance
Minimum zone 4 reverse reach setting = 3.96 / 80° ohms secondary
3.4.1.10 Residual Compensation for Earth Fault Elements
The residual compensation factor can be applied independently to certain zones if required.
This feature is useful where line impedance characteristics change between sections or
where hybrid circuits are used. In this example, the line impedance characteristics do not
change and as such a common KZ0 factor can be applied to each zone. This is set as a ratio
"kZ0 Res. Comp", and an angle "kZ0 Angle":
= 4.64 / 79.4° Ω secondary.
Z1
Z2 = 100 x 0.484 / 79.4° + 50% x 60 x 0.484 / 79.4°
Z2 = (100+30) x 0.484 / 79.4° x 0.12
= 7.56 / 79.4° Ω secondary.
= (100+60) x 1.2 x 0.484 / 79.4° x 0.12
Z3 = 11.15 / 79.4° ohms secondary
= 0.1 x 4.64 / 79.4°
Z4 = 0.464 / 79.4°
= (100+40) x 0.484 / 79.4° x 0.12
8.13 / 79.4° Ω secondary.
=
≥
Z4 ((8.13 / 79.4°) x 120%) - (5.81 / 79.4°)
= 3.95 / 79.4°
P44x/EN AP/Hb6
(AP) 5-73