GE UR series

GE Multilin L60 Line Phase Comparison System 5-119
5 SETTINGS 5.5 GROUPED ELEMENTS
5
• POS SEQ di/dt FDH PICKUP: This setting controls pickup of the high set stage of the element used to control the trip
operation. Nominal current of the phase CT bank of the relay is 1pu.
• POS SEQ di/dt FDH SEAL-IN: This setting defines seal-in time of the function. To equalize the response between all
terminals of the line, the timer is started at the rising edge of the raw di / dt condition. In this way, the fault detectors
reset approximately at the same time at all line terminals, regardless of responses of individual raw conditions poten-
tially different at different line terminals.
• POS SEQ FDH SUPV: This setting provides seal-in control of the FDH function for the symmetrical external three-
phase faults starting as non-symmetrical defined by the
POS SEQ DI/DT FDH SEAL-IN setting time. The overreaching dis-
tance function should typically be assigned with this setting.
• POS SEQ di/dt BLK: Note that the fault detector is hard-wired to the 87PC scheme. It can be disabled permanently
using the function setting, or blocked temporarily using this block setting. Select a FlexLogic™ operand that, if
asserted, should block this fault detector.
• POS SEQ di/dt FD TARGET: This setting controls targets of the function. These targets operate independently from
the 87PC targets.
• POS SEQ di/dt FD EVENTS: This setting controls event recording of the function. These events are logged indepen-
dently from the 87PC events.
Figure 5–49: POSITIVE-SEQUENCE CURRENT RATE OF CHANGE FAULT DETECTOR LOGIC
g) NEGATIVE-SEQUENCE OVERCURRENT FAULT DETECTION
PATH: SETTINGS ÖØ GROUPED ELEMENTS Ö PHASE COMPARISON ELEMENTS ÖØ ADVANCED FAULT DETECTORS
ÖØ NEGATIVE-SEQUENCE CURRENT
 NEGATIVE-SEQUENCE
 CURRENT
NEG SEQ I_2 FD
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
NEG SEQ I_2 FDL
PICKUP: 0.10 pu
Range: 0.02 to 5.00 pu in steps of 0.01
MESSAGE
NEG SEQ I_2 FDH
PICKUP: 0.50 pu
Range: 0.05 to 15.00 pu in steps of 0.01
MESSAGE
NEG SEQ I_2 BLK:
Off
Range: FlexLogic™ operand
MESSAGE
NEG SEQ I_2 FD
TARGET: Self-reset
Range: Self-Reset, Latched, Disabled
MESSAGE
NEG SEQ I_2 FD
EVENTS: Disabled
Range: Disabled, Enabled
831801A2.CDR
| I_1 - I_1* |
(summed
current)
FAST MEASUREMENTS
F1 PHASE CT BANK:
Pos-seq current, I_1
L1 PHASE CT BANK:
Pos-seq current, I_1
SETTINGS
POS SEQ di/dt
FDL PICKUP:
POS SEQ di/dt
FDH PICKUP:
> FDL PICKUP
> FDH PICKUP
87PC dI1/dt FDH OP
Hardwired to the
87PC function
RUN
AND
Enabled = 1
Off=0
SETTINGS
POS SEQ di/dt
FD FUNCTION:
POS SEQ di/dt
BLK:
(*) value delayed
by 0.5 cycle
0
t
DPO
TIMERS
POS SEQ di/dt
FDL SEAL-IN:
0
t
DPO
87PC dI1/dt FDL OP
FLEXLOGIC
OPERANDS
POS SEQ di/dt
FDH SEAL-IN:
OR
AND
SETTINGS
POS SEQ FDH
SUPV:
Off=0
Σ