Figure 5–35: LOAD ENCROACHMENT APPLIED TO DISTANCE ELEMENT
LOAD ENCRMNT BLK:
Pos Seq Voltage (V_1)
V_1 > Pickup
Pos Seq Current (I_1)
LOAD ENCROACHMENT MIN VOLT:
This setting specifies the minimum positive-sequence voltage required for operation of the element. If the voltage is below
this threshold a blocking signal will not be asserted by the element. When selecting this setting one must remember that the
UR measures the phase-to-ground sequence voltages regardless of the VT connection.
The nominal VT secondary voltage as specified under
is the p.u. base for this setting.
LOAD ENCROACHMENT REACH:
This setting specifies the resistive reach of the element as shown in the LOAD ENCROACHMENT CHARACTERISTIC dia-
gram. This setting applies to the positive sequence impedance and should be entered in secondary ohms and should be
calculated as the positive-sequence resistance seen by the relay under maximum load conditions and unity power factor.
LOAD ENCROACHMENT ANGLE:
This setting specifies the size of the blocking region as shown on the LOAD ENCROACHMENT CHARACTERISTIC and
applies to the positive sequence impedance.
GE Power Management
Figure 5–36: LOAD ENCROACHMENT SCHEME LOGIC
PATH: SYSTEM SETUP
L90 Line Differential Relay
5.5 GROUPED ELEMENTS
VOLTAGE BANK X1
LOAD ENCHR PKP
LOAD ENCHR DPO
LOAD ENCHR OP