GE UR series

5-118 L60 Line Phase Comparison System GE Multilin
5.5 GROUPED ELEMENTS 5 SETTINGS
5
Figure 5–48: NEGATIVE-SEQUENCE CURRENT RATE OF CHANGE FAULT DETECTOR LOGIC
f) RATE OF CHANGE OF POSITIVE-SEQUENCE CURRENT FAULT DETECTION
PATH: SETTINGS ÖØ GROUPED... Ö PHASE COMPARISON... ÖØ ADVANCED FAULT... ÖØ RATE OF CHANGE OF POS SEQ CURRENT
The element responds to the change in magnitude of the positive-sequence current over a sliding window of half a power
system cycle. Two current thresholds are provided for the low-set and high-set operation controlling keying and tripping.
The raw di / dt condition of the element detects the change and resets when reaching a steady state fault condition. As
such, a seal-in timer is provided to maintain the detected fault condition for a user specified period of time.
• POS SEQ di/dt FD FUNCTION: This setting enables or disables the rate of change of positive-sequence current fault
detection. Note that all fault detectors operate in parallel toward the 87PC function. If not required, a given fault detec-
tor shall be disabled. To effectively disable the overcurrent fault detectors under the main 87PC menu, set their thresh-
old very high.
• POS SEQ di/dt FDL PICKUP: This setting controls pickup of the low set stage of the element used to control the key
operation. Nominal current of the phase CT bank of the relay is 1 pu.
• POS SEQ di/dt FDL SEAL-IN: This setting defines seal-in time of the FDL 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.
 RATE OF CHANGE OF
 POS SEQ CURRENT
POS SEQ di/dt FD
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
POS SEQ di/dt FDL
PICKUP: 0.10 pu
Range: 0.01 to 5.00 pu in steps of 0.01
MESSAGE
POS SEQ di/dt FDL
SEAL-IN: 0.600 s
Range: 0.000 to 10.000 s in steps of 0.001
MESSAGE
POS SEQ di/dt FDH
PICKUP: 0.50 pu
Range: 0.01 to 5.00 pu in steps of 0.01
MESSAGE
POS SEQ di/dt FDH
SEAL-IN: 0.200 s
Range: 0.000 to 10.000 s in steps of 0.001
MESSAGE
POS SEQ FDH SUPV:
Off
Range: any FlexLogic™ operand
MESSAGE
POS SEQ di/dt BLK:
Off
Range: any FlexLogic™ operand
MESSAGE
POS SEQ di/dt FD
TARGET: Self-reset
Range: Self-Reset, Latched, Disabled
MESSAGE
POS SEQ di/dt FD
EVENTS: Disabled
Range: Disabled, Enabled
831800A2.CDR
| I_2 - I_2* |
(summed
current)
FAST MEASUREMENTS
F1 PHASE CT BANK:
Neg-seq current, I_2
L1 PHASE CT BANK:
Neg-seq current, I_2
SETTINGS
NEG SEQ di/dt
FDL PICKUP:
NEG SEQ di/dt
FDH PICKUP:
> FDL PICKUP
> FDH PICKUP
87PC dI2/dt FDH OP
Hardwired to the
87PC function
RUN
AND
Enabled = 1
Off=0
SETTINGS
NEG SEQ di/dt
FD FUNCTION:
NEG SEQ di/dt
BLK:
(*) value delayed
by 0.5 cycle
0
t
DPO
TIMERS
NEG SEQ di/dt
FDL SEAL-IN:
0
t
DPO
87PC dI2/dt FDL OP
FLEXLOGIC
OPERANDS
NEG SEQ di/dt
FDH SEAL-IN:
OR
AND
SETTINGS
NEG SEQ FDH
SUPV:
Off=0
Σ