GE L60 Instruction Manual page 262

Line phase comparison system, ur series
Hide thumbs Also See for L60:
Table of Contents

Advertisement

5.5 GROUPED ELEMENTS
NEG SEQ di/dt FD EVENTS: This setting controls event recording of the function. These events are logged indepen-
dently from the 87PC events.
SETTINGS
NEG SEQ di/dt
FD FUNCTION:
Enabled = 1
NEG SEQ di/dt
BLK:
Off = 0
FAST MEASUREMENTS
F1 PHASE CT BANK:
Neg-seq current, I_2
L1 PHASE CT BANK:
Neg-seq current, I_2
SETTINGS
NEG SEQ FDH
SUPV:
Off = 0
Figure 5–48: NEGATIVE-SEQUENCE CURRENT RATE OF CHANGE FAULT DETECTOR LOGIC
f) RATE OF CHANGE OF POSITIVE-SEQUENCE CURRENT FAULT DETECTION

PATH: SETTINGS
GROUPED...
 RATE OF CHANGE OF
 POS SEQ CURRENT
5
The element responds to the vector difference of the positive-sequence current phasors taken at the present moment and
one-half a power system cycle earlier. Two current thresholds are provided for the low-set and high-set operation control-
ling 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.
5-124
SETTINGS
NEG SEQ di/dt
FDL PICKUP:
NEG SEQ di/dt
FDH PICKUP:
RUN
| I_2 - I_2* |
> FDL PICKUP
Σ
(summed
> FDH PICKUP
current)
(*) value delayed
by 0.5 cycle
PHASE COMPARISON...
POS SEQ di/dt FD
FUNCTION: Disabled
POS SEQ di/dt FDL
MESSAGE
PICKUP: 0.10 pu
POS SEQ di/dt FDL
MESSAGE
SEAL-IN: 0.600 s
POS SEQ di/dt FDH
MESSAGE
PICKUP: 0.50 pu
POS SEQ di/dt FDH
MESSAGE
SEAL-IN: 0.200 s
POS SEQ FDH SUPV:
MESSAGE
Off
POS SEQ di/dt BLK:
MESSAGE
Off
POS SEQ di/dt FD
MESSAGE
TARGET: Self-reset
POS SEQ di/dt FD
MESSAGE
EVENTS: Disabled
L60 Line Phase Comparison System
TIMERS
NEG SEQ di/dt
FDL SEAL-IN:
0
t
DPO
NEG SEQ di/dt
FDH SEAL-IN:
0
t
DPO


ADVANCED FAULT...
RATE OF CHANGE OF POS SEQ CURRENT
Range: Disabled, Enabled
Range: 0.01 to 5.00 pu in steps of 0.01
Range: 0.000 to 10.000 s in steps of 0.001
Range: 0.01 to 5.00 pu in steps of 0.01
Range: 0.000 to 10.000 s in steps of 0.001
Range: any FlexLogic™ operand
Range: any FlexLogic™ operand
Range: Self-Reset, Latched, Disabled
Range: Disabled, Enabled
5 SETTINGS
Hardwired to the
87PC function
FLEXLOGIC
OPERANDS
87PC dI2/dt FDL OP
87PC dI2/dt FDH OP
831800A2.CDR
GE Multilin

Advertisement

Table of Contents
loading

Table of Contents