5-170
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS
CHAPTER 5: SETTINGS
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 potentially
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 distance
function typically is 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, blocks 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 independently
from the 87PC events.
Figure 5-79: Positive-sequence current rate of change fault detector logic
5.6.3.7 Negative-sequence overcurrent fault detection
SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
PHASE COMPARISON ELEMENTS
ADVANCED FAULT
DETECTORS
NEGATIVE-SEQUENCE CURRENT
NEGATIVE-SEQUENCE
CURRENT
NEG SEQ I_2 FD
FUNCTION: Disabled
Range: Disabled, Enabled
NEG SEQ I_2 FDL
PICKUP: 0.10 pu
Range: 0.02 to 5.00 pu in steps of 0.01
NEG SEQ I_2 FDH
PICKUP: 0.50 pu
Range: 0.05 to 15.00 pu in steps of 0.01
NEG SEQ I_2 BLK:
Off
Range: FlexLogic operand
NEG SEQ I_2 FD
TARGET: Self-reset
Range: Self-Reset, Latched, Disabled
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
AN
D
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
AN
D
SETTINGS
POS SEQ FDH
SUPV:
Off = 0
Σ
