5-172
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS
CHAPTER 5: SETTINGS
5
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.
Figure 5-81: Positive-sequence overcurrent advanced fault detector logic
5.6.3.9 Charge current compensation
SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
PHASE COMPARISON ELEMENTS
ADVANCED FAULT
DETECTORS
CHARGE CURRENT COMPENSATION
CHARGING CURRENT COMPENSATN
— This setting enables and disables the charging current calculations and corrections 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
87PC SCHEME SELECT
setting)
of the line charging current is subtracted from the line current.
This setting is forced to “Disabled” if a phase VT bank is not assigned at either source 3 or source 4.
The figure shows possible configurations.
CHARGE CURRENT
COMPENSATION
CHARGE CURRENT
COMPENSATN: Disabled
Range: Disabled, Enabled
CHARGE COMPENST BLK:
Off
Range: any FlexLogic operand
POS SEQ CAPACITIVE
REACTANCE: 0.100 K
Ω
Range: 0.100 to 65.535 kohms in steps of 0.001
ZERO SEQ CAPACITIVE
REACTANCE: 0.100 K
Ω
Range: 0.100 to 65.535 kohms in steps of 0.001
Hardwired to the
87PC function
To square pulse
and transmit logic
SETTINGS
Enabled = 1
POS SEQ I_1 FD FUNCTION
Off = 0
POS SEQ I_1 BLOCK
AND
FAST MEASUREMENTS
Positive-sequence
current I_1
F1 PHASE CT BANK
L1 PHASE CT BANK
Positive
current I_1
-sequence
Σ
SETTINGS
POS SEQ I_1 FDH PICKUP
RUN
POS SEQ I_1 FDL PICKUP
> (FDL PICKUP) / 4
> (FDH PICKUP) / 4
> (FDL PICKUP) / 4
> (FDH PICKUP) / 4
> FDL PICKUP
> FDH PICKUP
OR
OR
AND
AND
FLEXLOGIC OPERANDS
87PC I_1 FDL OP
87PC I_1 FDH OP
831031A3.CDR
