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CHAPTER 5: SETTINGS
GROUPED ELEMENTS
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
5-169
5
Figure 5-78: Negative-sequence current rate of change fault detector logic
5.6.3.6 Rate of change of positive-sequence current fault detection
SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
PHASE COMPARISON ELEMENTS
ADVANCED FAULT
DETECTORS
RATE OF CHANGE OF POS SEQ CURRENT
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
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 detector
shall be disabled. To effectively disable the overcurrent fault detectors under the main 87PC menu, set their threshold 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
POS SEQ di/dt FDL
PICKUP: 0.10 pu
Range: 0.01 to 5.00 pu in steps of 0.01
POS SEQ di/dt FDL
SEAL-IN: 0.600 s
Range: 0.000 to 10.000 s in steps of 0.001
POS SEQ di/dt FDH
PICKUP: 0.50 pu
Range: 0.01 to 5.00 pu in steps of 0.01
POS SEQ di/dt FDH
SEAL-IN: 0.200 s
Range: 0.000 to 10.000 s in steps of 0.001
POS SEQ FDH SUPV:
Off
Range: any FlexLogic operand
POS SEQ di/dt BLK:
Off
Range: any FlexLogic operand
POS SEQ di/dt FD
TARGET: Self-reset
Range: Self-Reset, Latched, Disabled
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
AN
D
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
AN
D
SETTINGS
NEG SEQ FDH
SUPV:
Off = 0
Σ
Содержание L60
Страница 130: ...4 30 L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL LOGIC DIAGRAMS CHAPTER 4 INTERFACES 4 ...
Страница 464: ...5 334 L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 5 SETTINGS 5 ...
Страница 498: ...7 10 L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL TARGETS MENU CHAPTER 7 COMMANDS AND TARGETS 7 ...
Страница 570: ...10 14 L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL DISPOSAL CHAPTER 10 MAINTENANCE 10 ...
Страница 582: ...A 12 L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL FLEXANALOG ITEMS APPENDIX A FLEXANALOG OPERANDS A ...
Страница 588: ...C 4 L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL REVISION HISTORY APPENDIX C MISCELLANEOUS C ...
Страница 592: ...iv L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL ABBREVIATIONS ...