GE D30 Instruction Manual page 210

5.5 GROUPED ELEMENTS
5
Figure 5–61: LOAD ENCROACHMENT APPLIED TO DISTANCE ELEMENT
• LOAD ENCROACHMENT MIN VOLT: This setting specifies the minimum positive-sequence voltage required for oper-
ation 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 D30 measures the phase-to-ground sequence voltages regardless
of the VT connection.
The nominal VT secondary voltage as specified with the
PHASE VT SECONDARY
• LOAD ENCROACHMENT REACH: This setting specifies the resistive reach of the element as shown in the Load
encroachment characteristic diagram. This setting should be entered in secondary ohms and be calculated as the pos-
itive-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 diagram and applies to the positive-sequence impedance.
SETTING
LOAD ENCROACHMENT
FUNCTION:
Disabled=0
Enabled=1
SETTING
LOAD ENCRMNT BLK:
Off=0
SETTING
LOAD ENCROACHMENT
SOURCE:
Pos Seq Voltage (V_1)
Pos Seq Current (I_1)
5-112
setting is the per-unit base for this setting.
SETTINGS
LOAD ENCROACHMENT
REACH:
LOAD ENCROACHMENT
ANGLE:
AND RUN
SETTING
Load Encroachment
LOAD ENCROACHMENT
Characteristic
MIN VOLT:
V_1 > Pickup
Figure 5–62: LOAD ENCROACHMENT SCHEME LOGIC
D30 Line Distance Relay
X
R
837731A1.CDR
SYSTEM SETUP AC INPUTS
SETTINGS
LOAD ENCROACHMENT
PKP DELAY:
LOAD ENCROACHMENT
RST DELAY:
t
PKP
t
RST
5 SETTINGS
VOLTAGE BANK X5
FLEXLOGIC OPERANDS
LOAD ENCHR PKP
LOAD ENCHR DPO
LOAD ENCHR OP
827847A2.CDR
GE Multilin