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GE UR Series Instruction Manual Page 163

Line differential relay.
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5 SETTINGS
Figure 5–35: LOAD ENCROACHMENT APPLIED TO DISTANCE ELEMENT
SETTING
LOAD ENCROACHMENT
FUNCTION:
Disabled=0
Enabled=1
SETTING
LOAD ENCRMNT BLK:
Off=0
SETTING
SETTING
LOAD ENCROACHMENT
LOAD ENCROACHMENT
SOURCE:
MIN VOLT:
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.
VT SECONDARY
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
X
SETTINGS
LOAD ENCROACHMENT
REACH:
LOAD ENCROACHMENT
ANGLE:
RUN
AND
Load Encroachment
Characteristic
Figure 5–36: LOAD ENCROACHMENT SCHEME LOGIC
PATH: SYSTEM SETUP
L90 Line Differential Relay
5.5 GROUPED ELEMENTS
R
837731A1.CDR
SETTINGS
LOAD ENCROACHMENT
PKP DELAY:
LOAD ENCROACHMENT
RST DELAY:
t
PKP
t
RST
ÖØ
Ö
AC INPUTS
VOLTAGE BANK X1
5
FLEXLOGIC OPERANDS
LOAD ENCHR PKP
LOAD ENCHR DPO
LOAD ENCHR OP
827847A2.CDR
ÖØ
PHASE
5-79

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L90

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