GE L60 Instruction Manual page 266

5.5 GROUPED ELEMENTS
• 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.
• 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
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.
SETTINGS
5
POS SEQ di/dt
FD FUNCTION:
Enabled = 1
POS SEQ di/dt
BLK:
Off = 0
FAST MEASUREMENTS
F1 PHASE CT BANK:
Pos-seq current, I_1
L1 PHASE CT BANK:
Pos-seq current, I_1
SETTINGS
POS SEQ FDH
SUPV:
Off = 0
Figure 5–52: POSITIVE-SEQUENCE CURRENT RATE OF CHANGE FAULT DETECTOR LOGIC
5-138
POS SEQ DI/DT FDH SEAL-IN
SETTINGS
POS SEQ di/dt
FDL PICKUP:
POS SEQ di/dt
FDH PICKUP:
RUN
| I_1 - I_1* |
> FDL PICKUP
Σ
(summed
> FDH PICKUP
current)
(*) value delayed
by 0.5 cycle
L60 Line Phase Comparison System
setting time. The overreaching dis-
Hardwired to the
TIMERS
87PC function
POS SEQ di/dt
FLEXLOGIC
FDL SEAL-IN:
OPERANDS
0
87PC dI1/dt FDL OP
t
DPO
87PC dI1/dt FDH OP
POS SEQ di/dt
FDH SEAL-IN:
0
t
DPO
831801A2.CDR
5 SETTINGS
GE Multilin