GE UR series Instruction Manual page 253

5 SETTINGS
The positive-sequence overcurrent advanced fault detector element responds to the increment of the magnitude of the pos-
itive-sequence current over a specified threshold. Thresholds are provided for low-set control of keying and high-set opera-
tion control of tripping.
The following settings are available.
• POS SEQ I_1 FD FUNCTION: This setting enables or disables the positive-sequence overcurrent fault detection. Note
that all fault detectors operate in parallel with the 87PC function. To effectively disable the overcurrent fault detectors
under the main 87PC menu, set their threshold very high.
• POS SEQ I_1 FDL PICKUP: This setting specifies the pickup of the low-set stage of the element used to control the
key operation. The nominal current of the phase CT bank of the relay is 1 pu.
• POS SEQ I_1 FDH PICKUP: This setting specifies the pickup of the high-set stage of the element used to control the
trip operation. The nominal current of the phase CT bank of the relay is 1 pu.
• POS SEQ I_1 BLK: The fault detector is hard-wired to the 87PC scheme. It can be disabled permanently using the
function setting or blocked temporarily with this setting. This setting selects a FlexLogic™ operand that blocks this fault
detector when asserted.
• POS SEQ I_1 FD TARGET: This setting controls targets of the positive-sequence overcurrent advanced fault detector
function. These targets operate independently from the 87PC targets.
• POS SEQ I_1 FD EVENTS: This setting controls event recording of the positive-sequence overcurrent advanced fault
detector function. These events are logged independently from the 87PC events.
SETTINGS
POS SEQ I_1 FD FUNCTION
Enabled = 1
Disabled = 0
POS SEQ I_1 BLOCK
Off = 0
FAST MEASUREMENTS
F1 PHASE CT BANK
Positive-sequence
current I_1
L1 PHASE CT BANK
Positive-sequence
current I_1
Figure 5–51: POSITIVE-SEQUENCE OVERCURRENT ADVANCED FAULT DETECTOR LOGIC
i) CHARGE CURRENT COMPENSATION
PATH: SETTINGS GROUPED ELEMENTS
CHARGE CURRENT
COMPENSATION
MESSAGE
MESSAGE
MESSAGE
• CHARGING CURRENT COMPENSATN: This setting enables and disables the charging current calculations and cor-
rections of the mixed current used as an operating quantity for fault detectors and square pulses. The voltage signals
used for charging current compensation are taken from source 3 or 4 assigned with the three-phase voltage bank on
the L5 voltage bank. As such, it is critical to ensure that three-phase line voltage is assigned to this source and voltage
bank settings are entered correctly. Half (or one-third for the three-terminal line, as defined by the
setting) of the line charging current is subtracted from the line current. The following diagram shows possible
SELECT
configurations.
GE Multilin
AND
SETTINGS
POS SEQ I_1 FDL PICKUP
POS SEQ I_1 FDH PICKUP
RUN
> (FDL PICKUP) / 4
> (FDH PICKUP) / 4
> (FDL PICKUP) / 4
> (FDH PICKUP) / 4
> FDL PICKUP
Σ
> FDH PICKUP
PHASE COMPARISON ELEMENTS
CHARGE CURRENT
COMPENSATN: Disabled
CHARGE COMPENST BLK:
Off
POS SEQ CAPACITIVE
REACTANCE: 0.100 KΩ
ZERO SEQ CAPACITIVE
REACTANCE: 0.100 KΩ
L60 Line Phase Comparison System
5.5 GROUPED ELEMENTS
To square pulse
and transmit logic
Hardwired to the
87PC function
FLEXLOGIC OPERANDS
OR
87PC I_1 FDL OP
AND
87PC I_1 FDH OP
OR
AND
CHARGE CURRENT COMPENSATION
Range: Disabled, Enabled
Range: any FlexLogic™ operand
Range: 0.100 to 65.535 kohms in steps of 0.001
Range: 0.100 to 65.535 kohms in steps of 0.001
5
831031A2.CDR
87PC SCHEME
5-121